Gypsum compositions of improved resistance to permanent deformation

FIELD: gypsum compositions and gypsum plates made from such compositions.

SUBSTANCE: proposed composition contains hardened gypsum, binding matrix made from hardened and calcined gypsum, water and modifying material containing mixture of organic poly- phosphonium compound or mixture of organic poly-phosphonium compounds in the amount of 0.01-3% of calcined gypsum and borate in the amount of 0.1-2% of mass of calcined gypsum containing ulexite, colemanite or mixture of ulexite and colemanite or modifying material containing poly-carboxyl compound or mixture of poly-carboxyl compounds in the amount of 0.01-4.99% of mass of calcined gypsum and poly-phosphate compound or mixture of poly-phosphate compounds in the amount of 0.004-2% of mass of calcined gypsum.

EFFECT: enhanced efficiency.

24 cl, 5 tbl

 

The technical FIELD

The present invention relates generally to gypsum compositions. More specifically, the invention relates to utverzhdennym gypsum compositions which exhibit enhanced resistance to permanent deformation.

BACKGROUND of the INVENTION

The cured gypsum (dihydrate calcium sulphate) is a well-known material, which is usually in many types of products. As an example, the cured gypsum is the main component of the final products manufactured with the use of traditional plasters (for example, covered with plaster internal walls of the buildings, as well as in gypsum boards with paper coating, applied in a typical shotengai the construction of the internal walls and ceilings of buildings. In addition, the cured gypsum is the main component hypocellular fibrous composite sheets and products, and is also included in the products that fill and smooth down the joints between edges of gypsum sheets. In addition, many special materials, such as materials used for the modeling and fabrication of moulds, which accurately processed, give products which contain a major amount of the cured plaster.

Typically, these gypsum-based products are prepared by forming a mixture of calcined gypsum (hemihydrate calcium sulphate and/or the anhydrite calcium sulphate) and water (and other components, if you want to). The mixture is cast into a desired shape or surface and then allow it to harden, forming a cured (i.e. registrationentry) gypsum by reaction of the calcined gypsum with water to form a crystalline matrix of hydrated gypsum (dihydrate calcium sulphate). It is necessary to hydrate the calcined gypsum makes possible the creation of the binder matrix of crystals of the cured plaster, thereby ensuring that the structure strength of the gypsum in the gypsum-based product. Moderate heating is used to display the residual free (i.e. unreacted) water to obtain a dry product.

One problem for such gypsum-based products is that they are often subjected to permanent deformation (e.g. bending), especially in conditions of high humidity, temperature or load. For example, the possibility of deflection is particularly problematic if gypsum-based sheets and tiles are stored or used in such a way that they are arranged horizontally. However, if the matrix of the cured gypsum in these products is not enough to resist permanent deformation, the product may begin to SAG in the areas between the points where they are secured or they rely on the underlying structure. It may be invisible, but can cause difficulties during and the use of products. In addition, in many applications of gypsum-based products should be able to carry the cargo, for example, isolation or load from condensation, without appreciable deflection.

Another problem for such gypsum-based products is that the dimensional stability may be compromised during their manufacture, processing and industrial applications. For example, in the manufacture of products made of the cured gypsum is usually a significant amount of free (i.e. unreacted) of water remains in the matrix after the plaster overiden. When drying the cured plaster for withdrawal of excess water binder crystals of the cured gypsum in the matrix tend to move closer to each other as the water evaporates. Thus as the water leaves the intergranular spaces of the gypsum matrix, the matrix shows a tendency to shrink under the influence of natural forces in dry plaster, which resisted the capillary pressure created by the water in the crystals of gypsum. As an increasing amount of water in the aqueous mixture of calcined gypsum, the lack of dimensional stability is becoming more of a problem.

Dimensional stability a concern even after the final dried product is installed, especially in conditions of changing temperature and humidity, when overide the hydrated gypsum is exposed, for example, the elongation and shrinkage. For example, the moisture will collect in the intergranular spaces of the matrix of gypsum in the drywall or tile, exposed to high humidity and temperature, can exacerbate the problem of deflection, causing the expansion of wet cardboard.

If such instability sizes managed to avoid or minimize, could be obtained various advantages. For example, the existing methods of manufacture of gypsum Board could give more output, if the leaves were not given the shrinkage during drying, and gypsum-based products designed to maintain the exact shape and spatial proportions (for example, for use in modeling and manufacturing of forms) could better meet these goals.

Accordingly, from the foregoing it should be clear that there is a real need in the composition of the cured plaster, showing enhanced resistance to permanent deformation (e.g., deflection) and improved dimensional stability. The invention provides such a composition of the cured plaster, satisfying at least one of these needs. These and other advantages of the present invention, and further features of the invention should be clear from here is the description.

BRIEF OPI is the W INVENTIONS

The present invention provides the composition of the cured plaster, showing enhanced resistance to permanent deformation (e.g. bending) and/or improved dimensional stability.

In one aspect, the present invention offers containing the cured gypsum composition which includes a binder matrix of the cured gypsum, formed, for example, using at least calcined gypsum, water, and a modifier material comprising (i) organic polyphosphonate combination or mixture of such compounds; (ii) a borate selected from ulexite, colemanite, or a mixture of colemanite, ulexite; or a mixture of one or more organic polyphosphonate compounds and one or more borates. In some embodiments implementing the present invention proposes borate amplifier in containing the cured gypsum composition in other ways than its direct addition to the above aqueous composition. For example, the borate can be made with the accelerator. While Borat can be introduced into the aqueous composition in the form of a milled mixture of borate and accelerator, in particular the dihydrate of calcium sulfate (e.g., gypsum seed).

In another aspect, the present invention offers containing the cured gypsum composition which includes a binder matrix of the CTE is established gypsum, formed, for example, using at least calcined gypsum, water, and a modifier material comprising (i) polycarboxylate combination or mixture polycarboxylic compounds; and (ii) polyphosphate compound or a mixture of polyphosphate compounds. In an additional aspect of the invention polycarboxylate connection or polyphosphate compounds, alone or in combination, can be used with organic polyphosphonate compounds or borates described above, or with those, and with others.

In another aspect of the present invention offers containing the cured gypsum composition comprising the cured gypsum (for example, the binder matrix of the cured gypsum). The cured gypsum treated in a subsequent curing process, the modifying material may be selected from (i) organic postoyalogo compound or mixture of such compounds; (ii) borate selected from ulexite, colemanite, or a mixture of ulexite and colemanite; (iii) carboxyl compound or mixture of carboxylic compounds; or mixtures of (i), (ii) and/or (iii). Utverjdenie gypsum product, if it is subjected to the following curing processing, does not require drying, although it can be done. In the aspect of the present invention subsequent to the curing treatment of inorganic phosphate the connection can also be used in combination with one or more of the above-mentioned modifying materials.

In another aspect the present invention provides an accelerator for water compositions calcined gypsum, including Borat and accelerating substance.

The invention may be better understood from the following detailed description of preferred embodiments.

DETAILED description of the INVENTION

The present invention offers containing the cured gypsum composition exhibiting improved resistance to permanent deformation (e.g. bending) and/or improved dimensional stability. As an example containing the cured gypsum composition can be in the form of gypsum boards.

Containing the cured gypsum composition includes a binder matrix of the cured plaster and is prepared from a mixture (e.g., suspensions or suspensions), including water and calcined gypsum. The calcined gypsum can be fibrous or fibrous. Preferably, the main part (for example, at least 50 wt.%) calcined gypsum is lint-free. In some embodiments, the implementation of the calcined gypsum is composed almost entirely of fibrous calcined gypsum. In addition, the calcined gypsum can be in the form of alpha hemihydrate of calcium sulfate, hemihydrate, beta-calcium sulfate, water-soluble anhydrous calcium sulfate or mixtures thereof. In some embodiments, the implementation of the main part(for example, at least 50 wt.%) burnt gypsum consists essentially of beta hemihydrate of calcium sulfate.

In accordance with the present invention for imparting containing the cured gypsum compositions with improved resistance to deflection and/or improved dimensional stability is proposed to use one or more of the modifying materials. For example, resistance to the deflection given to modifying materials, it is advantageous, as attached containing the cured gypsum compositions are more stable in time form. For example, the resistance to deflection, given the modifying material, is favorable to overcome the presence of some salts (such as chloride salts), which may be present as impurities in the aqueous mixture of calcined gypsum, and which in some cases can lead to deflection during use. In addition, the improved dimensional stability (e.g. resistance to shrinkage), attached to the modifying material, favorable, for example, to resist loads during drying, and therefore, the shrinkage at the time of manufacture and resistance to the expansion of the dimensions during operation.

In some embodiments, implementation of the modifying material is present in the aqueous mixture of calcined gypsum during the hydration of calcined gypsum for images is of the cured gypsum (i.e. prior to the curing process). In some embodiments, the implementation of pre-curing treatment suitable modifying materials include, for example, (i) organic polyphosphonate compound or their mixture; (ii) a borate selected from ulexite, colemanite, or mixtures thereof; or a mixture (i) and (ii). In addition, options such implementation may optionally include a second modifying material is selected, for example, from (iii) polycarboxylic compounds or mixtures thereof; (iv) polyphosphate compounds, or mixtures thereof; or a mixture (iii) and (iv). Professionals should be clear that in the practice of the present invention can be used in different combinations and permutation modifiers four groups (i)-(iv) modifying materials.

In some embodiments, the implementation of pre-curing treatment according to the invention, the modifying material is mixed with the aqueous mixture of calcined gypsum, includes (i) polycarboxylate combination or mixture polycarboxylic compounds; and (ii) polyphosphate compound or a mixture of polyphosphate compounds.

In the variants of implementation, where the modifying material is included in an aqueous mixture of calcined gypsum or added to it during the hydration of calcined gypsum for the formation of the cured plaster, the modifying material may be included in any suitable m is a COP in many forms. For example, the modifying material may be included in the aqueous mixture or added to it, for example, before or when the water and calcined gypsum connect for mixing (for example, in the mixing apparatus). Another possibility is mixing the modifying material, the gypsum raw before it is heated for education calcined gypsum, so that the modifying material is already present, when the calcined gypsum is mixed with water to cause rehydration.

In addition, the modifying material may be delivered (e.g., by sputtering) on the already mixed aqueous mixture of calcined gypsum after she posted on covering the surface (for example, on a moving tape). Usually the second covering surface is then placed on top of the tiled mixture. Thus the solution of the modifying material will seep into lined mixture and be present in it, when there will be the main hydration for the formation of the cured plaster.

Other alternative delivery methods of modifying material will be understood by specialists and are considered in the scope of the invention. For example, one or both of the covering surfaces can be pre-coated with a modifying material, for example, so that the modifying material will dissolve and migrate the AMB through the mixture, when the sediment water mixture calcined gypsum in contact with the sheets covering the surface.

In some embodiments, implementation, when you choose borate, at least a portion of the borate may be mixed and then milled with the accelerator before entering the obtained milled mixture in an aqueous composition. In such scenarios, the implementation of the accelerator, i.e. the dihydrate of calcium sulfate, and borate are mixed and then milled. Without being bound to any particular theory, it is believed that when the grinding Borat becomes attached to the outer surface of the accelerating material - dihydrate calcium sulphate, creating at least a partial covering layer on the material. Regardless of theory, however, the combination of borate and accelerator after grinding favorably acts as an accelerator, and gives the final gypsum product superior resistance to deflection. The presence of borate in the form of at least partial coating on the material of the accelerator favorably protects the activity of the accelerator, while minimizing the harmful interaction between the active sites of the accelerator with moisture (e.g., during storage), allowing to avoid the need for covering the substance (e.g., sugar or boric acid) and related costs. Ulexite and colemanite are naturally occurring borate is mi and they are available at much lesser price, than synthetic materials, such as boric acid.

Preferably, the mixture of borate and accelerator grind under conditions sufficient to obtain the final composition of the accelerator with an average particle size of less than about 5 microns. Preferably, the powdered composition, in addition, has a surface area of at least about 7,000 cm2/year Total effective method of grinding proposed in U.S. patent 3.573.947, although in some embodiments of the invention, the heating is not necessary for the preparation described here is covered borate accelerator. The obtained milled mixture of the accelerator can then be added to the aqueous mixture of calcined gypsum in amounts effective to maintain control over the rate of conversion of a mixture of calcined gypsum in the cured gypsum at the desired level. For this input method, the most appropriate of the borates are ulexite and colemanite, and the first is the most preferred.

In some embodiments, implementation of the modifying material proposed for treatment of already formed or partially formed) of the composition of the cured gypsum comprising the cured gypsum (i.e. for treatment after curing). In such scenarios, the implementation of suitable modifying materials include, for example, (i) the organization is practical polyphosphonate compound or their mixture; (ii) a borate selected from ulexite, colemanite, or mixtures thereof; (iii) carboxyl compound or their mixture; or a mixture (i)/ (ii) and/or (iii). Optional, options for implementation may include a second modifying material selected from, for example, phosphate compounds, or mixtures thereof.

Processing containing the cured gypsum composition of the modifying material may be performed before or after cured plaster composition is dried (for example, in an oven or dryer) to lead-free (i.e. unreacted) water. To do this, the modifying material is applied (e.g., spray or impregnated with a solution such as an aqueous solution containing, for example, from about 0.01% to about 2% of the modifying material) containing the cured gypsum composition in order to provide the desired treatment. Preferably, the treatment is carried out after drying, containing the cured plaster compositions; containing the cured gypsum composition, preferably, re-dried after treatment (for example, with an optional re-exposure to water containing the cured gypsum composition, such as, for example, impregnation). Preferably, the modifying material can migrate into the composition of the cured gypsum even through ordinary sheets of paper to be used when processing ode cured plaster.

It is noteworthy that during implementation of the invention, the modifying material may be added to an aqueous mixture of calcined gypsum prior to the formation of part of the cured plaster and, at the same time, also as a means of processing after the formation of the part of the cured plaster. In this regard, the processing before curing and processing after curing can occur simultaneously according to the invention. For example, adding a modifying material during setting (for example, at the time, when formed only a part of the cured gypsum) will be processed prior to curing with respect to the portion where the adhesion of the plaster is still, and will be processed after curing with respect to the portion where the cured gypsum has been realized.

It should be clear that a combination of different approaches to the input of the modifying material in the final gypsum product, for example, the combination processing to the setting (for example, grinding the accelerator and/or dry add) and/or processing after setting (in various combinations of one or more modifying materials), to provide various benefits described here are assumed to be included in the scope of the present invention.

The modifying material may be included in any suitable amount. For example, the amount of the modifying material the material is preferably chosen so that to obtain the advantages of the present invention, for example, use a quantity sufficient to give the composition of the cured gypsum desired resistance to deflection and/or dimensional stability. In this regard, an effective amount of the modifying material should vary depending on, for example, the number of contaminants, for example, chloride anion, or similar raw calcined gypsum, as well as the type of the selected modifier material and other factors. For example, processing to cure the amount of reactive material incorporated in the aqueous mixture of calcined gypsum or added thereto, is preferably from about 0.01% to about 5% by weight of the calcined gypsum, and, more preferably, the amount of reactive material incorporated in the aqueous mixture of calcined gypsum or added to it, is from about 0.1% to about 2% by weight of the calcined gypsum. When processing after curing, the amount of reactive material used in the practice of the invention, preferably, ranges from about 0.01% to about 5% by weight of gypsum, and, more preferably, from about 0.1% to about 2% by weight of gypsum.

The modifying material may be delivered to process before curing or after curing, e.g. the measures solution (for example, water), including the modifying material, and/or in the form of a dry additive. In the case of delivery of the modifying material solution, the concentration of the modifying material in the solution is chosen so as to provide the proper amount of reactive material per mass of calcined gypsum or cured plaster, processed as described above. In relation to post-cure machining solution, preferably, also has enough water to thoroughly moisten the cured gypsum (for example, in order to uniformly distribute the modifying material in a matrix of gypsum).

Regarding modifying materials, it should be noted that organic postname connection (for example, organic phosphonates or postname acid) according to the invention include at least one functional group RPO3M2where M represents a cation, phosphorus or hydrogen, and R represents an organic group. Application of organic polyphosphonates connection is preferred when processing prior to curing, and processing after curing, although the treatments after curing according to the invention can be used monophosphate connection. Preferred organic polyphosphonate compounds include, at the very measures which, two phosphonate salt or ionic group, at least two phosphonoacetate group, or at least one phosphonate salt or ionic group and at least one vospalitionuu group. Monophosphate connection used in the processing after curing according to the invention, includes one phosphonate salt or ionic group or at least one vospalitionuu group.

The inclusion of organic fofanah compounds as the modifying material is favorable, because it was found that such compounds impart resistance to deflection containing the cured gypsum compositions according to the invention, for example, in conditions of high humidity. In addition, the inclusion of organic fofanah compounds improves the dimensional stability, as it is considered, for example, that organic postname connections help the binding of crystals in the matrix of the cured plaster.

It is noteworthy that the organic group of the organic fofanah compounds linked directly to the phosphorus (i.e. without intermediate oxygen). For example, organic postname compounds suitable for use in the invention include, but are not limited to, compounds characterized by the following structures:

or.

In these structures, R refers to an organic group containing at least one carbon atom bound directly to the atom P, and n is a number from about 1 to about 1000, preferably, from about 2 to about 50.

Organic postname compounds include, for example, aminotri(methylenephosphonic acid), Penta-sodium salt aminotri(methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, Tetra sodium salt of 1-hydroxyethylidene-1,1-diphosphonic acid, pentanethiol salt diethylenetriaminepenta- (methylenephosphonic acid), chinatravel salt diethylenetriaminepenta(methylenephosphonic acid), hexamethylenediaminetetra(methylenephosphonic acid), potassium salt hexamethylenediaminetetra(methylenephosphonic acid), or the like. In some embodiments, implementation of the invention used DEQUEST phosphonates® (e.g., DEQUEST® 2000, DEQUEST® 2006, DEQUEST® 2016, DEQUEST® 2054, DEQUEST® 2060S, DEQUEST® 2066A, and the like)manufactured by Solutia, Inc., St.Lois, Missouri. Other examples of suitable fofanah compounds can be found in the patent of the USA 5.788.857.

If organic postname connection is included in the aqueous mixture of calcined gypsum when processing before curing, the amount of organic postoyalogo compounds used in the practice of the invention for the preparation of the mixture, is preferably from about 0.01 wt.% to about 1 wt.% from the weight of the calcined gypsum and, more preferably, from approximately 0.05 wt.% to about 0.2 wt.% from the weight of the calcined gypsum. When processing after curing, the amount of organic postoyalogo compounds used in the practice of the invention and which is delivered in the composition of the cured plaster, is, preferably, from about 0.01 wt.% to about 1 wt.% by weight of gypsum and, more preferably, from approximately 0.05 wt.% to about 0.2 wt.% by weight of gypsum. For example, organic postname connection can be delivered in the composition of the cured gypsum solution (e.g. water), including organic postname connection.

Carboxylic compounds are also suitable for use as the modifying material in the present invention. Preferably, the carboxylic compounds are soluble in water. Preferably use polycarboxylic compounds, although monocarboxylate compounds can be used in the processing after curing on the image the structure. In this regard, polycarboxylate connection includes at least two carboxylate salt or an ionic group, at least two carboxylic acid groups or at least one carboxylate salt or an ionic group and at least one carboxylic acid group. Monocarboxylate connection used in the processing after curing according to the invention, includes one carboxylate salt or an ionic group or at least one carboxylic acid group.

The inclusion of carboxyl compounds as the modifying material is favorable, because it was found that carboxyl compounds impart resistance to deflection containing the cured gypsum compositions according to the invention, for example, in conditions of high humidity. In addition, the inclusion of carboxyl compounds improves the dimensional stability, since it is considered that, for example, carboxyl group assists the binding of crystals in the matrix of the cured plaster. For example and not for limiting the invention, polycarboxylate the connection can be in the form of a polyacrylate, polymethacrylate, polymetacrylate etc. During processing after curing carboxylic compound may optionally be in the form of citrate (for example, salts, such as, for example, qi is rat sodium).

When handling to cure polycarboxylate compounds suitable for use in the present invention preferably have a molecular weight from about 100,000 daltons to about 1 million daltons. Polycarboxylate compounds with higher molecular weight are less desirable because their viscosity is too high, whereas compounds with a lower molecular weight (progressive falling below 100,000 daltons) are less effective. In some embodiments be processed before curing polycarboxylate compound has a molecular weight of from about 200,000 daltons to about 700000 daltons, such as, for example, from about 400,000 daltons to about 600000 daltons. In some embodiments, the implementation of the carboxylic compound is a polyacrylate, in which case polyacrylate preferably has a molecular weight of from about 200,000 daltons to about 700,000 people daltons, more preferably, from about 400,000 daltons to about 600000 Dalton.

When processing after curing carboxyl compound preferably has a molecular weight of from about 200 daltons to about 1000000 daltons. For example, in some embodiments, the implementation of treatment after curing carboxyl compound has a molecular weight of from about 200 Delta is up to about 100,000 daltons (e.g., from about 1,000 daltons to about 100,000 daltons, or from about 10,000 daltons to about 100,000 daltons), while in other embodiments, implementation of the carboxyl compound has a molecular weight of from about 100,000 daltons to about 1 million daltons (e.g., from about 200,000 daltons to about 700000 daltons, or from about 400,000 daltons to about 600000 daltons).

If the carboxylic compound is included in an aqueous mixture of calcined gypsum when processing before curing, the amount of carboxyl compounds used in the practice of the invention for the preparation of the mixture, is preferably from about 0.01 wt.% to about 5 wt.% from the weight of the calcined gypsum and, more preferably, from approximately 0.05 wt.% to about 2 wt.% from the weight of the calcined gypsum. When machining after hardening, the number of carboxyl compounds used in the practice of the invention and which is delivered in the composition of the cured plaster, is preferably from about 0.01 wt.% to about 5 wt.% by weight of gypsum and, more preferably, from approximately 0.05 wt.% to about 2 wt.% by weight of gypsum. For example, the carboxylic compound may be delivered in the composition of the cured gypsum solution (e.g. water), including carboxyl connection.

Borates and, in particular, naturally occurring ulexite (NaCaBsub> 5O9·8H2O) or colemanite (CA2In6About11·5H2O), or a mixture of ulexite and colemanite, can also be introduced as the modifying material. In some embodiments, implementation of the preferred ulexite, partly due to its relatively low price. It should be noted that borates are not completely soluble in water. Unexpectedly, even such polurethane borates, which are polyborate connection, give the desired effect in accordance with the present invention. This is even more surprising as other completely soluble boron-containing substances, such as boric acid, which monobactam connection, much less the desired effect and unusable in the scope of the invention. The inclusion of such borates as modifying materials is beneficial, because it was found that they give containing the cured gypsum materials resistance to deflection even in the presence of aqueous mixture of calcined gypsum contaminants, such as chlorides. This discovery is important because it allows us to use when retrieving items from the cured plaster, such as wallboard, lower quality and less expensive grades of calcined gypsum without any significant negative impact on the fight is their deflection. In addition, borates do not slow down significantly the formation containing the cured gypsum composition.

In the method of processing before curing the borate may be added to the aqueous mixture of calcined gypsum in powder form and/or in the form of a solution (e.g. aqueous solution). In some embodiments, implement, for example, the borate may be added after he crushed the accelerator - dihydrate calcium sulphate, as described above. Additionally, in some embodiments, the implementation of the borate type, using both methods.

If the borate is included in the aqueous mixture of calcined gypsum when processing before curing, the amount added to a mixture of borate in the practice of the invention is, preferably, from about 0.1 wt.% to about 2 wt.% from the weight of the calcined gypsum and, more preferably, from about 0.2 wt.% up to about 0.5 wt.% from the weight of the calcined gypsum. When processing after curing, the amount of borate used for processing the cured plaster, in the practice of the invention is, preferably, from about 0.1 wt.% to about 2 wt.% by weight of gypsum and, more preferably, from about 0.2 wt.% up to about 0.5 wt.% by weight of gypsum. For example, the borate can be delivered in the composition of the cured gypsum solution (e.g. water), including Borat.

In addition to and adhering to izaberete the Oia, inorganic phosphate can be combined with other described here modifier materials. In particular, preferred are inorganic polyphosphate compounds, although inorganic monophosphate compounds can be used in the treatment after curing according to the invention. Inorganic polyphosphate compounds selected from, for example, condensed phosphoric acids, each of which includes two or more phosphorotioate group, and salts or ions of condensed phosphates, each of which includes two or more phosphate groups, or compounds comprising one or more phosphoroclastic groups and one or more groups, phosphate salt or phosphate ion. Monophosphate compounds used in the processing after curing according to the invention include one phosphorotioate group or one group of a phosphate salt or phosphate ion.

The inclusion of inorganic phosphates additionally improves the resistance to deflection and, in regard to the treatment after curing, the other mechanical properties (e.g. compressive strength) containing the cured gypsum composition. In some embodiments, the implementation of the inorganic phosphates are present in the form of the following salts or anionic parts: connection trimetaphosphate is (for example, such salts as, for example, trimetaphosphate sodium, trimetaphosphate calcium, metrically trimetaphosphate, trimetaphosphate potassium, trimetaphosphate lithium, and the like), sodium hexametaphosphate having 6-27 repeating phosphate groups of the ammonium polyphosphate having 500-3000 (preferably 1000-3000) repeating phosphate groups, tetrakaidecahedral, trinitrotoluol-tripolyphosphate, nutrition-phosphate, tetranitro-pyrophosphate, acidic sodium pyrophosphate or polyphosphoric acid having 2 or more repeating phosphorotioate group. In some embodiments, the implementation of the inorganic phosphate compound includes trimetaphosphate sodium and/or ammonium polyphosphate. Examples monophosphate compounds (also called orthophosphate compounds)used in the variants of implementation of treatment after curing, are dokily sodium phosphate, dokily potassium phosphate and phosphoric acid.

If phosphates are included in the aqueous mixture of calcined gypsum when processing before curing, the amount of such inorganic phosphates used in the practice of the invention or added to the pre-mixture, is preferably from about 0.004 wt.% to about 2 wt.% from the weight of the calcined gypsum, and more preferably, from around 0.04 wt.% to about 0.16 wt.% from the weight of the calcined gypsum. When processing on the Le curing amount of such inorganic phosphates, used in the practice of the invention, is preferably from about 0.004 wt.% to about 2 wt.% by weight of gypsum, and more preferably, from around 0.04 wt.% to about 0.16 wt.% by weight of gypsum. For example, inorganic phosphate can be delivered in the composition of the cured gypsum solution (e.g. water), including phosphate.

In addition, any of the modifying materials to some extent slow down the rate of hydration of education of the cured gypsum (and negatively affect the strength containing the cured gypsum composition), as, for example, in regard to organic fofanah compounds, carboxyl compounds or phosphates (other than ammonium polyphosphate or trimetaphosphate connection), any such deceleration may be reduced or even overcome by introducing into the mixture of the accelerator, in particular, dihydrate calcium sulphate. Of course, there may be other accelerators are well known in practice, such as aluminum sulfate, sodium bisulfate, zinc sulfate, etc.

In accordance with the present invention containing the cured gypsum composition according to the invention can be in the form of gypsum boards, which preferably has a resistance to deflection, determined according to ASTM C473-95, of less than about 0.1 inch (˜0,254 cm) by two feet (˜0,61 m) length of the specified PL is you. In addition, the gypsum plate preferably has a shrinkage in its manufacture (for example, when containing the cured gypsum compound dried) less than about 0.02 inches (˜0,051 cm) to four feet (˜1,22 m) width and less than about 0.05 inches (˜to 0.127 cm) to twelve feet (˜3.66 m) length.

Gypsum composition may also include optional additives, such as, but not limited to this, a hardening additive, a binder (for example, polymers, such as latex), porous perlite, air voids formed by aqueous foam, starch, such as pre-gelatinizing starch, accelerating agents, a setting retarder, water resistance agents, bactericides, fungicides, biocides, fibrous Mat (for example, on a plaster plate, comprising a plaster composition according to the invention), and, as should be understood by an ordinary specialist, other additives, or combinations thereof.

Reinforcing additives can be included in the gypsum composition according to the invention, if required, in order to improve strength during processing. For example, a hardening additive may include cellulosic fibers such as paper fibers, mineral fibers, other synthetic fibers or the like, or combinations thereof. Hardening additive, such as paper fibers, may be entered in any suitable amount. N the example, in some embodiments, the implementation of the hardening additive is present in amount from about 0.1 wt.% to about 5 wt.% by weight of the composition of the cured plaster.

In order to reduce the density, composition of the cured plaster according to the invention can, optionally, include air voids formed by aqueous foam. In particular foaming agent may be added to the aqueous mixture of calcined gypsum during cooking. It is desirable that the main part of the foaming agent to generate the foam, which is relatively unstable upon contact with the aqueous suspension of calcined gypsum. It is also desirable that the lower part of the foaming agent to generate a relatively stable foam. For example, in some embodiments, the implementation of the water foam is formed, at least one foaming agent having the formula:

CH3(CH2)xCH2(OCH2CH2)yOSO3-M+,

where M is a cation, X is an integer from 2 to about 20, Y is an integer from 0 to about 10, and 0 for at least 50 wt.%, at least one foaming agent. Preferably Y is 0 for from about 86 to about 99 wt.%, at least one foaming agent.

In addition, the gypsum composition can is, not necessarily, include starch, such as pre-gelatinizing starch or modified acid starch. The inclusion of pre-gelatinizing starch helps to minimize the risk or avoid the risk of delamination of the paper in the conditions of increased humidity. Average professional should be clear how the pre-gelatinization of raw starch, such as, for example, cooking of raw starch in water at temperatures of at least 185°F (˜85°C), or other methods. Suitable examples of pre-gelatinizing starch include, but are not limited to, starch PCF 1000, commercially available from Lauhoff Grain Company, and starches AMERIKOR 818 and HQM PREGEL, both issued Archer Daniels Midland Company. Pre gelatinizing starch, if included, may be present in any suitable amount. For example, pre-gelatinizing starch, if included, may be present in amount from about 0.1 wt.% to about 5 wt.% by weight of the composition.

Gypsum composition may also include a fibrous Mat. The fibrous Mat may be woven or nonwoven. It is desirable that the fibrous Mat consisted of a material that can adapt to the expansion of the plaster composition during hydration. For example, the fibrous Mat may be in the form of paper mA is a, Mat of fiberglass or Mat made of another synthetic fiber. In some embodiments, the implementation of the fibrous Mat is non-woven and may include fiberglass. It is desirable that the fibrous Mat can be placed on the surface and/or put into plaster casting during formation in order to improve the integrity and technological properties of the dried plaster cast during production, transportation and application. In addition, the fibrous Mat may be used as the outer surface of the final product (for example, ceiling tiles) and thereby to provide aesthetically pleasing uniform appearance, which can be preferably smooth. Fibrous Mat, if it is introduced, may have any suitable thickness. For example, in some embodiments, the implementation of the fibrous Mat has a thickness of from about 0.003 to inches (˜0,00762 cm) to about 0.15 inches (˜0,381 cm).

The following examples further clarify the present invention, but, of course, should not be construed as in any way limiting its scope. In the examples below, the following abbreviations have the indicated meanings:

APPS Means organic polyphosphonate connection

APPS Is aminotri(methylenephosphonic acid)

APPS Is pentanitrate salt aminotri(is telepostanovki acid)

APPS Is TETRANITRATE salt 1-hydroxyethylidene-1,1-diphosphonic acid

APPS Is potassium salt hexamethylenediaminetetra(methylenephosphonic acid)

APPS Represents diethylenetriaminepenta(methylenephosphonic acid)

APPS Is chinatravel salt diethylenetriaminepenta (methylenephosphonic acid)

PAK Means poly(acrylic acid)

PACK Is poly(acrylic acid)having a molecular weight of about 2.000 Dalton

PACK Is poly(acrylic acid)having a molecular weight of about 30.000 Dalton

PACK Is poly(acrylic acid)having a molecular weight of about 250.000 Dalton

PACK Is poly(acrylic acid)having a molecular weight of about 450.000 Dalton

PACK Is poly(acrylic acid)having a molecular weight of about 750.000 Dalton

PACK Is Belclene 283 (available from FMC Corporation, Princeton, New Jersey)

PACK Is Belclene 200 (available from FMC Corporation)

PACK Is Belsperse 161 (available from FMC Corporation)

EXAMPLE 1

Resistance to permanent deformation

(Resistance to deflection laboratory gypsum boards)

Samples of gypsum-based boards were prepared in the laboratory in accordance with the invention and compared in relation to resistance to permanent deformation when brazzle plates, prepared using methods and compositions that are not subject inventions.

Samples were prepared by mixing a 5-liter WARING mixer for 10 seconds at low speed 1.5 kg of beta hemihydrate of calcium sulfate, 2 g of the curing accelerator, including little particles dihydrate calcium sulphate, covered sugar to maintain the effectiveness and heated as described in U.S. patent 3573947, which is included in the description as a reference, 2 l of drain water, and 0 g of additive (control samples), 1.5 g organic polyphosphonates connection or 1.5 g other additives. Educated thus the suspension was poured into trays for receiving samples of a flat plaster plates, each of which had a size of about 6×24×1/2 inch. After hemihydrate of calcium sulfate was utverjdala, forming gypsum (dihydrate calcium sulphate), the plate was dried in an oven at 112°F (˜44,4° (C) up until their weight has never ceased to change. The final measured mass of each plate was recorded. On these plates do not cause any paper coatings, in order to avoid the influence of paper coatings on the characteristics of the deflection of gypsum boards in wet conditions.

Then each of the dried plate was placed in a horizontal position on two feet with a width of 1.2 inches, the length of which prostires is the entire width of the plate, one pole on each end plate. The plates were left in this position for a fixed period of time (in this example, 4 days) at constant ambient conditions with a temperature of 90°F (˜32,2° (C) and a relative humidity of 90 percent. Then determined the degree of deflection plates by measuring the distance (in inches) of the center of the upper surface plate from an imaginary horizontal plane lying between the upper edges of the ends of the plate. Believed that the resistance matrix of the cured gypsum plate permanent deformation is inversely proportional to the magnitude of the deflection plate. Thus, the greater the deflection, the less the relative resistance to permanent deformation member stove matrix of the cured plaster.

The results of the tests of resistance to permanent deformation are shown in table I, including the composition and concentration (mass percent based on the weight of the hemihydrate calcium sulphate) additives, the final mass of the plate and the measured deflection.

In these laboratory experiments, the deviation of deflection was determined according to ASTM C473-95 Humidified Deflection Test, except that the subjects gypsum boards did not include the wall-paper, and except that the subjects gypsum plate had a size of 0.5 ft (˜0,154 m) × 2 ft (˜0,61 m) instead of 1 ft (˜0,305 m) × 2 ft (˜0,61 m). However, it was found that h what about the deviation of deflection plates, manufactured in the laboratory, correlates with the deviation of deflection plates size 1 CFT (˜0,305 m) × 2 ft (˜0,61 m), described in ASTM test With 473-95, and, if there is any difference, then that difference will be that the deviation of deflection more plates in the laboratory. Therefore, if the plates are made in the laboratory according to the invention comply with the required standards of resistance to bending, the plate according to the invention is manufactured with compliance With ASTM 473-95 will also meet the required standards of resistance to deflection.

Table I
AdditiveThe level of addition (wt.%)

in the calculation of the burnt plaster
The weight of dry plates (g)Capture water from space 90/90 (wt.%)Deflection (inches) deflection for ten days hydrate
Control0,0536,20,150,985
Phosphate glass0,1538,50,240,013
Ammonium polyphosphate0,1534,80,420,012
Trimetaphosphate sodium0,1531,40,230,035
OP is C1 0,1539,20,150,044
APPS0,1537,10,240,077
APPS0,1536,30,280,117
APPS0,1to 541.30,13to 0.060
APPS0,1551,20,29is 0.102
APPS0,1515,80,321,253

The data of table I show that the plate is made using organic polyphosphonate compounds in accordance with the invention, had a much greater resistance to deflection (and thus a much greater resistance to permanent deformation)than the control plate. Furthermore, stove, manufactured using several organic polyphosphonate compounds had a trough that was much smaller than the deflection of 0.1 inch (˜0,254 cm) by two feet (˜and 0.61 cm) length of the plate, and, therefore, was not perceived by the human eye. Other organic polysulfonamide compounds such as APPS and APPS, showed marked improvement in depression compared with the control plate.

It should be clear that accelerators can be used in order to what kotoroy extent to overcome the effects of a slowdown and a decrease in strength, which can be caused by organic polyphosphonate connections. In the examples above, no attempt has been made to overcome such effects. If, however, to overcome such effects were added accelerator, it is expected that the plates are made from any of these organic polyphosphonate compounds will have a deflection of less than 0.1 inch (˜0,254 cm) by two feet (˜and 0.61 cm) length of the plate.

EXAMPLE 2

The example shows the use of ulexite as a modifying material to improve resistance to deflection of the gypsum boards. Resistance to permanent deformation when used as an additive of ulexite as such and milled with a curing accelerator comprising pulverized particles of the dihydrate of calcium sulfate, as described above, was determined as described above in example 1.

In addition, it is also shown a beneficial effect from the use of ulexite in the presence of impurities chloride salt. Plaster plate was prepared as in example 1 except that the mixture together with the addition of ulexite has introduced a chloride ion. The deflection was determined in accordance with method ASTM With 473-95 on prepared in the laboratory plates, as described above.

In these examples, the number of ulexite, introduced in aqueous suspension calcined gypsum by adding RA the ground mixture with the accelerator, is about 0.05 wt.% from calcined gypsum. In the last example in table II total number of ulexite added to aqueous suspensions of calcined gypsum, is about 0.15 wt.% from calcined gypsum (to 0.05 wt.% in the form of a milled mixture with accelerator plus 0.10 wt.% added additionally).

Table II
AcceleratorThe concentration of the accelerator, (wt.%) on the burnt gypsumAdditive NaCl, wt.% on the burnt gypsumThe weight of dry plates (g)Capture water from space 90/90 (wt.%)The amount of deflection (inches) after 2 weeks when wet
Control10511,40,80,214
Covered with ulexite10528,40,60,067
Control10,5consists 528.36,5>1
Covered with ulexite10,5529.4 M.6,10,235
Covered with ulexite + additive of 0.1 wt.% the ulexite (calculated on the weight of calcined gypsum)10,5529,76,0 0,057

The data in table II show improvement in the resistance to deflection (expressed by the deflection value)obtained when using ulexite, or adding of ulexite in the form of a milled mixture of ulexite and dihydrate of calcium sulfate as an accelerator or as independent additive or as a dry powder or aqueous solution. The data also show that Borat, ulexite provides improved values of deflection even if a significant amount of contamination by chloride anion (e.g., NaCl) is present in the aqueous mixture of calcined gypsum (which may be at a relatively low quality calcined gypsum), and when the absorption of water in the final product is gypsum Board is relatively high.

EXAMPLE 3

Processing dihydrate calcium sulphate after curing

In some alternative preferred embodiments, the implementation of the present invention to the manufacture of the dihydrate of calcium sulfate is treated with an aqueous solution of the modifying material to increase resistance to permanent deformation (e.g., resistance to bending) and dimensional stability containing the cured gypsum products after re-drying. More specifically, it was found that the processing of casting dihydrate calcium sulphate various modifying materials according to the present invention has taken the supports resistance to permanent deformation (e.g., the resistance to deflection) and dimensional stability. Thus, an implementation option, in which the modifying material is added to otverzhdennom plaster, provides new compositions and methods of making the improved gypsum-based products, including, but not limited to, plate, panel, plaster, tile, hypocellular fiber composites, etc. So any product on the basis of gypsum, which requires a strict control of resistance to deflection, should benefit from this option, the implementation of the present invention.

Examples of two ways of treating the cured gypsum are as follows.

1)2)
Plaster and other additives (dry) plus water for cooking mistPlaster and other additives (dry) plus water for cooking mist
Foam (to reduce weight or density)Blending/mixing (wet)
Casting plaster/final curing and dryingCasting plaster/final curing
Subsequent processing of the modifying material (aerosol iopromide) Subsequent processing of the modifying material (sputtering on the surface)
The plaster cast after re-dryingThe dried gypsum product
Improved gypsum productImproved gypsum product

In both of the above methods, the cured gypsum preferably applied aqueous solution of the modifying material.

Modifying the spray material on the composition of the cured gypsum in the form of a solution of the modifying material in the water. The amount of reactive material in the solution is calculated according to the weight of the dihydrate of calcium sulfate (cured gypsum).

Plate laboratory manufacturing was prepared as described in example 1, and laboratory plates were ASTM test With 473-95 Humified Sag Deflection Test, as explained above in example 1.

Table III shows the improvement in the magnitude of deflection is reached when the modifying material or additive was organic polyphosphonate connection. Table IV shows the improvement of the magnitude of the deflection is achieved when the additive was poly(acrylic acid). Table V shows the improvements of the magnitude of the deflection is achieved when the additive was citrate soda is I, carboxyl compound, which includes at least two carboxylate groups.

Table III
AdditiveThe concentration of the additive (wt.%) on the burnt gypsumThe weight of dry plates (g)Capture water from space 90/90 (wt.%)The amount of deflection (inches) after 2 weeks when wet
Control0,0572,70,150,285
Trimetaphosphate sodium0,2580,70,190,011
APPS0,2586,90,240,021
APPS0,2582,50,220,029
APPS0,2573,90,260,045
APPS0,2570,70,250,014
APPS0,2606,80,360,012
APPS0,2583,50,260,008

The data in table III show that the application of organic polyphosphates on the cured gypsum provides an improvement of the magnitude of the deflection plays plate showed resistance to deflection is much less than the desired value of 0.1 inches (˜ 0,254 cm) by two feet (˜0,61 m) length of the plate, when the processing after curing according to this invention used organic polyphosphonate.

Table IV
AdditiveThe concentration of the additive (wt.%) on the burnt gypsumThe weight of dry plates (g)Capture water from space 90/90 (wt.%)The amount of deflection (inches) after 2 weeks when wet
Control0,0552,60,590,424
PAK0,2567,51,20,043
PAK0,085410,7of 0.081
PAK0,08551,20,670,069
PAK0,2544,50,60,058
PAK0,2569,90,30,161
PAK0,1is 552.50,20,054
PAK0,1is 552.50,20,054
PAK0,1553,60,50,026

The data in table V show what carboxylates give the composition of the cured gypsum increased strength during processing after curing. The data show that administration of soluble carboxylates, i.e. PAK 1-4 and PACK and PACK more effective than the use of carboxylates, slightly soluble in water, for example, PAC, even though treatment after curing polycarboxylates PACK gives the stove improved resistance to bending compared to control.

Table V
AdditiveThe concentration of the additive (wt.%) on the burnt gypsumThe weight of dry plates (g)Capture water from space 90/90 (wt.%)The amount of deflection (inches) after 2 weeks when wet
Control0,0519,40,31,5
Sodium citrate0,2569,10,40,173

Table V shows the unexpected benefits of the treatment after curing. Sodium citrate is usually considered a setting retarder, and its use has a negative impact on strength and resistance to deflection, if it is used as an additive in the pre-treatment. However, when processing after curing, it was found that sodium citrate zoom which provides resistance to deflection.

All cited sources here, including patents, patent applications and publications hereby incorporated in its entirety as a reference.

The invention has been described here with emphasis on the preferred embodiments of specialists should be clear that can be applied to variations of the preferred embodiments, and that it is intended that the invention may be implemented differently than described here. Accordingly, this invention includes all modifications encompassed by the spirit and scope of the invention as defined in the following claims.

1. The composition comprising the cured plaster, comprising a binder matrix of the cured gypsum, formed from calcined gypsum, water, and a modifier material comprising a mixture of 0.01-3 wt.% from the weight of the calcined gypsum organic polyphosphonate compound or mixture of organic polyphosphonate compounds and 0.1-2 wt.% from the weight of the calcined gypsum Borat, including ulexite, colemanite, or a mixture of ulexite and colemanite.

2. The composition according to claim 1, where the specified composition formed with the additional use of the second modifier material comprising polycarboxylate combination or mixture polycarboxylic connections.

3. The composition according to claim 2, where the specified composition education is and with the additional use of third-modifying material, including polyphosphate compound or a mixture of polyphosphate compounds.

4. The composition according to claim 1, where the specified compostie formed with the additional use of the accelerator.

5. The composition according to claim 4, where at least a portion of the borate applied to the accelerator.

6. The composition according to claim 1, in which the calcined gypsum is formed from 0.11 to 5 wt.% the modifying material based on the weight of calcined gypsum.

7. The composition according to claim 2, in which the specified polycarboxylate compound has a molecular weight of from about 100,000 daltons to about 1 million daltons.

8. The composition according to claim 2, in which the specified polycarboxylate compound selected from the group consisting of polyacrylates, polymetacrylate and polymethacrylates.

9. The composition according to claim 3, in which the specified polyphosphate compound selected from the group consisting of trimetaphosphate compounds, sodium hexametaphosphate having 6-27 repeating phosphate groups, ammonium polyphosphate, tetramerista, sodium tripolyphosphate, tetrahydrofolate, acidic sodium pyrophosphate, and polyphosphoric acid having 2 or more repeating phosphoroclastic groups.

10. The composition according to claim 3, in which the specified third-modifying material selected from trimetaphosphate compounds and ammonium polyphosphate.

11. The composition according to claim 3, in which the th specified third-modifying material is an ammonium polyphosphate.

12. The composition comprising the cured plaster, comprising a binder matrix of the cured gypsum, formed from at least calcined gypsum, water, and a modifier material comprising 0.01 to 4,99 wt.% from the weight of the calcined gypsum polycarboxylic compounds or mixtures polycarboxylic compounds and 0,004-2 wt.% from the weight of the calcined gypsum polyphosphate compounds or a mixture of polyphosphate compounds.

13. The composition comprising the cured gypsum comprising the cured plaster, where specified the cured gypsum treated with a mixture of liquid and modifying material comprising 0.1 to 1 wt.% from the weight of the calcined gypsum organic postoyalogo compound or mixture of organic fofanah compounds, 0.1 to 2 wt.% from the weight of the calcined gypsum Borat, including ulexite, colemanite, or a mixture of ulexite and colemanite, from 0.01 to 4.8 wt.% from the weight of the calcined gypsum carboxyl compound or mixture of carboxylic compounds.

14. The composition comprising the cured plaster, item 13, where this composition is further processed second modifying material comprising a phosphate compound or a mixture of phosphate compounds.

15. The composition according to claim 1, in which the specified organic polyphosphonate connection is aminotri(methylenephosphonic acid), pentanethiol salt aminotri(m is telepostanovki acid), 1-hydroxyethylidene-1,1-diphosphonic acid, Terentieva salt 1-hydroxyethylidene-1,1-diphosphonic acid, pentanethiol salt diethylenetriaminepenta(methylenephosphonic acid), chinatravel salt diethylenetriaminepenta(methylenephosphonic acid), hexamethylenediaminetetra(methylenephosphonic acid), or potassium salt hexamethylenediaminetetra(methylenephosphonic acid).

16. The composition according to any one of claims 1 or 13, in which the specified Borat is a ulexite.

17. The composition according to item 13, in which the specified carboxyl compound is polycarboxylate connection.

18. The composition according to 17, in which the specified polycarboxylate compound has a molecular weight of from about 200 daltons to about 1 million daltons.

19. The composition according to item 13, in which the specified carboxyl compound selected from the group consisting of polyacrylates, polymetacrylate, polymethacrylates and citrates.

20. The composition according to any one of claims 1 or 17, in which the specified polycarboxylate connection is a polyacrylate.

21. The composition according to 14, in which the specified second modifying material is a polyphosphate compound.

22. Gypsum comprising the composition according to any one of claims 1 or 12.

23. Gypsum on p.22, where specified gypsum has a resistance to deflection, defined the TES according to ASTM C473-95, less than 0.25 cm (0.1 inch) 60.1 cm (two feet) length specified plate.

24. Gypsum according to item 23, where the specified gypsum has a shrinkage of less than 0.05 cm (0.02 inch) on 120,2 cm (four feet) in width and less than of 0.13 cm (0.05 inches) to 360 cm (twelve feet) length.

The priority is set 25.04.2000 on the date of filing the first application in the U.S. Patent Office.



 

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3 ex

FIELD: manufacture of building materials, dry building mixes in particular; industrial and civil construction engineering for covering various internal surfaces of buildings.

SUBSTANCE: proposed dry building mix contains the following components, mass-%: according to first version -calcium sulfate of α- or β-form, 38-58; shungite sand of variety III, 40-60; hydrated lime, 2-4; modified additive, 0.23-0.37 including methyl cellulose, 0.10-0.12; starch ether, 0.1-0.2; tartaric acid, 0.03-0.05; according to second version - cement, 30-45; shungite sand, 50-65; hydrated lime, 2-4; dispersed powder on vinyl acetate and ethylene copolymer, 0.5-5; methyl cellulose, 0.02-0.4; according to third version - calcium sulfate, 40-60; shungite sand, 35-55; dispersed powder, 0.1-2; methyl cellulose, 0.2-0.4; according to fourth version - cement, 28-35; shungite sand, 65-72; dispersed powder, 2-5; methyl cellulose, 0.2-0.3. Shungite sand is used in fractions of from 0,2 to 0.63 mm.

EFFECT: improved adhesion, strength and binding properties of coat at retained low intensity of radiation passing through surface covered with this coat.

8 cl, 8 tbl

FIELD: construction engineering; production of gypsum and gypsum articles possessing water-repellent properties.

SUBSTANCE: proposed complex additive for hydrophobization of gypsum contains the following components, mass-%: sodium methyl siliconate, 29-32; sodium hexafluosilicate, 0.5-1.5; aluminum chloride, 4-6; the remainder being water.

EFFECT: enhanced moisture protective and mechanical properties; enhanced durability of products made from gypsum.

2 tbl, 1 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: manufacture of gypsum cardboard with specified-size pores distributed within gypsum core comprises following stages: blowing air into foaming substance to form foamed liquid, mixing the latter with mixture containing burnt gypsum and water to form fluid gypsum flour, pouring the flour into space between upper and lower sheets of lining paper for gypsum cardboard, shaping lining paper and fluid gypsum flour as cardboard, roughly cutting cardboard material followed by drying, and cutting dried cardboard material according to size of supposed product. Method is characterized by that, in order to reduce size of pores distributed in foamed fluid gypsum flour, a special agent is added to one of the following materials: to mother solution of foaming substance or to mixture thereof with water, content of above agent in foaming substance corresponding to 0.00001-0.005 wt parts per 100 wt parts burnt gypsum. Disclosed is also a method of manufacturing gypsum cardboard using a pore-increasing agent.

EFFECT: enabled rapidly and al low cost controlling pore size within gypsum core of product when manufacturing products with high-strength core and excellent adhesion for lining paper.

5 cl, 8 dwg, 1 tbl, 4 ex

FIELD: construction engineering; manufacture of walls and facing items from gypsum.

SUBSTANCE: proposed method includes grinding the calcium sulfate dihydrate, tempering it and molding articles. Grinding is continued till obtaining poly-dispersed coarse and fine powders characterized by residue on sieve No.2 of 15-23% and up to 2%, respectively at ratio of average diameters of particles in coarse and fine powders D/d equal to 16; then, coarse and fine powders are mixed in dry form at ratio of 1:1.23 and mixture thus obtained is tempered by saturated lime solution till obtaining semi-dry mixture at moisture content of 14-16%; molding is performed by semi-dry method at pressure of 30-25 Mpa.

EFFECT: enhanced resistance to water; reduced power requirements.

4 dwg, 1 tbl, 1 ex

FIELD: manufacture of building materials.

SUBSTANCE: invention relates to foam gypsum materials used in manufacture of construction-destined heat insulation, light building parts (e.g. cores of layered wall panels), dry plaster, etc. Foam gypsum composition comprising, wt %: semiaquatic gypsum 39.4-51.4, quartz sand 0.6-20.4, foaming agent 0.1-0.7, and water (the balance) further contains orthophosphoric acid 0.6-1.3 and magnesium and/or aluminum silicate 0.6-9.5, wherein foaming agent is 1:1 mixture of synthetic surfactant and polyvinyl alcohol.

EFFECT: increased strength of hardened material and reduced drying time.

1 tbl

FIELD: coatings for products from gypsocard and their manufacture.

SUBSTANCE: the gypsocard with a coating applied onto it has: a gypsum core having the first side, second side and an outer sheet positioned on the first side, and a coating applied at least onto part of the external sheet, at least part of the coating penetrates at least through part of the external sheet to the gypsum core. The method for production of gypsocard with a coating includes: application of a gypsum suspension with production of damp gypsocard, having a gypsum core, application of coating onto the outer sheet of damp gypsocard and subsequent drying of the damp gypsocard, at least part of the coating penetrates at least through part of the outer sheet to the gypsum core. The method of wall production includes production of gypsocard with a coating in compliance with the mentioned for application of coating onto damp gypsocard, fastening of gypsocard with a coating on a supporting structure with production of a wall and application of adhesive tape and finishing of the joints between the adjoining sheets of gypsocard with coating with the use of a fastening agent, whose composition is essentially similar to the coating composition. The invention is developed in the species claims of the invention.

EFFECT: accelerated mounting and production of more durable finishing coatings, improved finished appearance of the finishing coating and reduced duration of production and reduced cost of it.

23 cl, 4 dwg, 1 ex, 3 tbl

FIELD: manufacture of building materials; manufacture of wall structural materials.

SUBSTANCE: raw material mixture for production of gypsum articles contains ground technogenious calcium sulfate dihydrate, lime and water; technogenious gypsum is used at specific surfaces of 3000 and 9000 cm2/g; used as lime and water is saturated solution of slaked lime at the following ratio of components, mass-%: gypsum at specific surface of 3000 cm2/g, 37.6-41.6; gypsum at specific surface of 9000 cm2/g, 46.4-50.4; saturated solution to content: slaked lime, 0.0135-0.019; the remainder being water. Proposed method of production of gypsum articles includes preparation of raw material mixture by mixing the ground technogenious calcium sulfate dihydrate with lime and water and molding; molding is performed in two stages: at first stage by loading with specific pressure equal to 1/3 of terminal pressure, holding at this pressure for 45-60 s and relieving the pressure to zero; at final stage, by loading with pressure of 30-40 Mpa, holding at this pressure for 2.5-3 min and relieving pressure to zero.

EFFECT: enhanced strength of gypsum articles.

3 cl, 1 tbl, 3 ex

Dry plaster mix // 2278086

FIELD: building material industry, in particular production dry plaster mix for internal building finishing.

SUBSTANCE: claimed mix contains (mass %): mineral white binding agent, fine milled limestone, methylcellulose, slaked lime, citric acid, and additionally it contains ethylene-vinyl laurate-vinyl chloride terpolymer and vinyl acetate and ethylene copolymer in the next ratio (mass %): mineral white binding agent 70-82; fine milled limestone 15-25; slaked lime 3-5 and above 100 % of mixture of three components mentioned above: methylcellulose 0.2-0.4; citric acid 0.075-0.09; ethylene-vinyl laurate-vinyl chloride terpolymer 0.75-1.0; and vinyl acetate and ethylene copolymer 0.3-0.5.

EFFECT: increased strength characteristics, water-retaining capacity, adhesion strength of obtained plasters.

1 ex

FIELD: methods of production of gypsum boards.

SUBSTANCE: proposed method is used for manufacture of gypsum boards with core lesser than 0.77; method includes preparation of foam from water and surfactant containing at least one alkyl sulfate H(CH2)nOSO3-M+; number "n" of this formula indicates figure from 6 to 16; "M" is monovalent cation and average number of carbon atoms "nm" ranges from 9 to 10; foam thus obtained is introduced into gypsum mass; amount of surfactant introduced into gypsum mass does not exceed 0.32 per liter of gypsum mass. Gypsum boards made by this method possess mechanical strength similar to that of non-lightened boards.

EFFECT: enhanced mechanical strength and enhanced strength of adhesion core to front surface of board.

13 cl, 3 tbl, 6 ex

FIELD: gypsum-containing composition.

SUBSTANCE: claimed composition contains 0.1-30 % of various specific fat chemical additives with molecular weight of 20000 in respect to total dry mixture.

EFFECT: gypsum-containing composition of improved quality.

18 cl, 14 ex, 1 tbl

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