Isocyanate - and polycladida reactive resin

 

(57) Abstract:

Describes a new isocyanate and polycladida reactive resin containing polaprezinc, filler, suspendisse agent, water-bonding agent and catalyst. The resin contains a polyisocyanate in an amount up to 50% excess of isocyanate in terms of reactive hydroxyl groups of the polyol, a filler in an amount up to 70 weight% in terms of resin, suspendisse agent in an amount up to 10 wt.% in terms of polyol, water-bonding agent in an amount up to 10 wt.% in terms of the polyol and the catalyst in amounts of preferably from 0.01 to 0.5 wt.% in terms of the polyol, and the amount of catalyst and suspending agent agreed immediately after receiving resin, is applied in the form of a rectangular strip with a length of 10 cm, a height of 1 mm and a width of 1 cm on pre-heated to a temperature of curing fat-free steel sheet, placed immediately after the application of the strip in a vertical position in an oven at ensuring horizontal stripes flowing down for 10 minutes and at a temperature of 25oC for at least 15 cm and (b) at a temperature of 130oC - 3-0,3 see the Technical result - the development of light is passed pores and high mechanical strength, which, in particular, non-toxic. 3 C.p. f-crystals. table 2.

The invention relates to isocyanate - and polylateral reactive resin, and also to its use as a binder for granular material intended for the manufacture of molded products with open pores.

Products with open pores, consisting, for example, from the pebbles, known. For example, in the shop "ADAC Motorwelt", edition 2/1993, pp. 6-8 describes the stones for paving, permeable rain water. In particular describe the "filter stone, consisting of small pebbles, through which, as through the sponge, rainwater is absorbed there, anywhere. This stone is suitable as a building material not only for Parking, and sidewalks and bike paths,

Also known molded product with open pores, containing thermosetting polyurethane as a binder for the mixture of gravel with sand. In the European patent EP 468 608 described the drainage element for equipment wells, consisting mainly of 20-30 parts by weight of a specific filler and 1 weight part of binder based on polyurethane. As the filler used filter gravity is RA. The disadvantage is that you have to remove the sand grains with a diameter of less than 1 mm. in Addition, curing at a temperature of 80oC requires too much time and therefore unprofitable. A further drawback is the uneven distribution of the polyurethane binder. Especially negative is the fact that we have "nests" Nesmachnyi fine particle that has a negative effect on the strength of the product.

In patent WO 92/18702 described geostrophically elements, which are made by joining the cast elastomer several segments without reference environment. These elements consist of a mixture of gravel with polyurethane and cast resin. Granular fraction consists of particles with a diameter of 2 to 8 mm, or 2 to 4 mm binder Content is 5 wt.%.

The firm "Lubag" in its prospectus describes strong in compression and gravel filter without reference environment, which is made of a polyurethane binder and a mixture of quartz sand fraction grain size 1 to 4 mm and has the following advantages: high permeability, durable column of the well, an excellent filtering effect, suitability for use up to 200 m depth, high mechanical p the urethane binder in the prospectus there is no such information.

In the German patent DE 40 23 005 described is similar to the present invention polyurethane system suitable, for example, for the manufacture of filters for inserting the glass in the core bars for window covers, as well as for the manufacture of multilayer building components. Polyol as one component contains 15 to 100 wt.% polyol, 0 to 85 wt.% filler, 0 to 5 wt.% the drying agent such as zeolite, 0 to 2 wt.% thickener, 0 to 2 wt.% other excipients, such as, for example, dyes or catalysts and 1 to 10 wt.% thixotropic substances consisting of a mixture of polyamidoamine with low molecular weight multifunctional amine.

Proceeding from the described prior art, an objective of the invention is to develop a binder for granular material, allowing easy and reliable manufacturer of molded open-cell foam and high mechanical strength, which in particular non-toxic.

The solution to this problem according to the present invention described in the claims. It mainly lies in the choice of a particular isocyanate and polylateral reactive resin containing the following components:

a) a polyol,

b) a polyisocyanate,

C) catalysis is suspendiruemye agent contained in reaktsioonina resin in such a concentration, directly after mixing for 10 minutes, the resin flows down, namely (a) at a temperature of 25oC - in at least 15 cm, and (b) at a temperature of 130oC mostly on not more than 3 cm, preferably not more than 2 cm, and in particular not more than 1 cm, but at least 0.6 cm, preferably at least see 0,3

As a result, the viscosity reactive resin with one hand at room temperature and under stirring so low that the granular material is well moistened, and on the other hand with increasing temperature and without stirring, the viscosity is so high, that being in vertical position a thin layer of a reactive resin does not flow down. During curing receive a thermosetting polyurethane.

In principle, all polyols, already famous for producing polyurethane, are also usable in the present invention. Particularly suitable known simple polyoxy-polyesters of molecular weight 60 - 10000, preferably 70 - 6000, containing 2 to 10 hydroxyl groups per molecule. Such simple policypolicy get known method of alkoxysilane suitable initiator molecules, such as water, propylene glycol, glycerol, trimethylolpropane and ethylene oxide.

A further type of simple polyoxy-polyesters are polytetrahydrofuran obtained by polymerization with ring opening.

You can also apply a standard polyester polyols of molecular weight 400 to 10 000, if they contain 2 to 6 hydroxyl groups. They particularly apply if necessary excellent resistance to light and heat. Suitable polyester polyols are known products of the interaction of excess quantities of polyhydric alcohols listed as initiator molecules, with polybasic acids, such as, for example, succinic acid, adipic acid, phthalic acid, terephthalic acid, or any mixtures of such acids. You can also apply esters or partial esters of saturated or unsaturated fatty acids are presented with polyoxy connections, and their ethoxylated or propoxycarbonyl derivatives. Preferably applies a complex polyester diol from hexanediol and adipic acid. Finally you can also apply the prepolymers with hydroxyl groups, the oligomers of the polyisocyanates and polyols in a large excess, as well as polyols based on polycarbonates, polycaprolactones, and the floor is alantie aromatic and aliphatic isocyanates. Preferably, on average, they contain 2, 3 or at least 4 isocyanate groups. Suitable isocyanates are, for example: 1,5-naphthylenediisocyanate, 4,4'-diphenylmethanediisocyanate, hydrogenated 4,4'-diphenylmethanediisocyanate (H12-4,4'-diphenylmethanediisocyanate), xylylenediisocyanate, tetramethylcyclopentadienyl, 4,4'- diphenylmethyl-mechanisation, dialkyldithiocarbamate, tetraalkylammonium-mechanisation, 4,4'-dibenzoylresorcinol, 1,3-delete the entry, 1,4-delete the entry, the isomers of toluylene diisocyanate, optionally in mixture of 1-methyl-2,4 - diisocyanate-cyclohexane, 1,6-diisocyanate-2,2,4-trimethyl-hexane, 1,6-diisocyanate-2,4,4-trimethylhexane, 1-isocyanatomethyl-C - isocyanate-1,5,5-trimethyl-cyclohexane, chlorinated and brominated diisocyanates, phosphorus-containing diisocyanates, 4,4'- diisocyanatobutane, Tetra-methoxybutan-1,4-diisocyanate, butane-1,4-diisocyanate, hexane-1,6-diisocyanate, dicyclohexylmethane, cyclohexane-1,4-diisocyanate, ethylene diisocyanate, complex bis-isocyanatomethyl ester of phthalic acid. Further important diisocyanates are trimethylhexamethylene-diisocyanate, 1,4-diisocyanatobutane, 1,12 - diisocyanatobutane, diisocyanate dimer sour rowanne the polyisocyanates, contributing to the formation samoszhimayuschihsya polyurethanes, for example, dimeric toluylenediisocyanate. Finally, it is also possible to use prepolymers, i.e. oligomers with multiple isocyanate groups. They are known to receive when a large excess of Monomeric MDI in the presence of, for example, diolen. In General, preferably used aromatic isocyanates.

The polyols and the polyisocyanates preferably used as a two-component injection-molding resin, with low molecular weight polyisocyanate and of relatively low molecular weight polyol are mixed only shortly before application. The polyisocyanate is used with an excess of isocyanate equal to 50% based on the polyol, preferably 10-30% excess.

As catalysts for efficient use of tertiary amines or amidine and ORGANOMETALLIC compounds, and mixtures thereof. As amines can be applied acyclic, and in particular also cyclic compounds. Specifically, you can call: tetramethylbutylamine, 1,4-diaza-bicicletta, 1,8 - diaza-bicyclo-(5.4.0)-undecene.

As the ORGANOMETALLIC compounds can be applied iron compounds, in particular compounds of tin.NAT iron (III).

As catalysts in particular apply ORGANOTIN compounds. The term "ORGANOTIN compounds" refers to compounds containing tin, and the organic residue, for example, compounds containing at least one tin-carbon bond. In a broader sense organic compounds primarily are, for example, salts such as, for example, octoate tin(II) or tin stearate(II). Compounds of tin in a more narrow sense are, first and foremost, the compounds of tetravalent tin General formula Rn+1SnX3-nwhile n refers to the number of 0-2, R is alkyl, aryl, albarillo and/or aracelio group, which in addition to carbon atoms and hydrogen can also contain oxygen atoms, in particular in the form of a ketone or ester groups, and X is a compound of oxygen, sulfur or nitrogen. Residues R or X may be associated with each other, and in this case together with the tin atom to form a ring. Such compounds are described in European patents EP 491 268, EP 490 277, EP 423 643. R expediently contains at least 4 carbon atoms, in particular at least 8 carbon atoms, the maximum number of carbon atoms, typically, is 12. n preferably is organicheskoi oxide, hydroxide, alcoholate, -dicarbonyl compound, a carboxylate or a salt of an inorganic acid. X can also mean the sulfur compound, i.e., ORGANOTIN sulfide, tilt or an ester of timeslot. Among tin and sulfur compounds are especially suitable esters of thioglycolic, for example compounds containing the following residues:

-S-CH2-CH2-CO-O-(CH2)10CH3< / BR>
or

-S-CH2-CH2-CO-O-CH2-CH(C2H5)- CH2-CH2-CH2-CH3.

Such compounds satisfy further requirements: the molecular weight of the tin-organic compounds preferably above 250, in particular above 600.

A preferred class of compounds are the carboxylates dialkyl tin(IV) (X = O-CO-R1). Carboxylic acids contain 2, preferably at least 10, in particular 14-32 carbon atoms. It is also possible to use dicarboxylic acids. Suitable acids are: adipic acid, maleic acid, fumaric acid, malonic acid, succinic acid, Emelyanova acid, terephthalic acid, phenylacetic acid, benzoic acid, acetic acid, propionic acid, and t is andnew acid, palmitic acid, stearic acid. Specific suitable compounds are diacetate dibutylamine and dactylology, maleate dibutylamine and dactylology, bis-(2-ethylhexoic) dibutylamine and dactylology, dilaurate dibutylamine and dactylology, acetate anti, dilaurate bis(-methoxycarbonyl-ethyl)-tin, dilaurate bis(-acetyl-ethyl)tin.

Also preferably used tin oxide, tin sulfides and thiolate tin. Specific compounds are: oxide bis(anti) oxide bis(trioctylamine), bis(2-ethyl - exertional) dibutylamine, bis(2-ethyl-exertional)dactylology, didodecyl dibutylamine, didodecyl dactylology, didodecyl bis(-methoxycarbonyl-ethyl)tin, bis(2 - ethyl-exertional)-bis(-acetyl-ethyl)tin, didodecyl dibutylamine, didodecyl dactylology, butyl tin Tris-2 - ethylhexanate thioglycolic, octyl-tin Tris-2 - ethylhexanate thioglycolic, di-butyl tin bis-2 - ethylhexanate thioglycolic, dictyoglomi bis-2 - ethylhexanate thioglycolic, tributylamine 2-ethylhexanate thioglycolic, trioctylamine 2-ethylhexanate thioglycolic, Tris(diethylenglycol-2-ethylhexoic) and, bis(diethyleneglycol-2-ethylhexoic) dactylology, (diethylenglycol-2-ethyl-hexout) inputs of TBT (diethylenglycol-2-ethylhexoic) trioctylamine General formula Rn+1Sn(SCH2CH2OCOC8H17)3-nwhile R means an alkyl group with 4 to 8 carbon atoms, bis(diethyleneglycol-2-ethylhexoic) bis(- methoxycarbonyl-ethyl)tin, bis(2-ethylhexoic-Tillyaeva acid)-bis(-methoxycarbonyl-ethyl)tin, bis(diethyleneglycol-2-ethylhexoic)-bis(-acetyl-ethyl)tin, bis(2-ethylhexoic-Tillyaeva acid)- bis(-acetylethyl)-tin.

Of the other listed compounds of tin include: the anti hydroxide, deatiled dibutylamine, dibutylin dibutylamine, dihexyl Vexillology, deacetylation dibutylamine, diethylaminoacetate dibutylamine, oxide bis(butyldichlorosilane) sulfide bis(dibutylphthalate), dichloride dibutylamine, dichloride dactylology, dithioacetate dibutylamine, dithioacetate dactylology.

The catalyst is preferably added to the polyol. The amount of added catalyst depends on its activity and the reaction conditions, and preferably is 0.01 - 0.5 wt.% in terms of the polyol.

Suspendisse agent primarily logocan important wetting. Besides, suspendisse agent to prevent settling of the particles. Closely connected with this thixotropic effect isocyanate and polylateral reactive resin: when mixed with granular material and when filling in the form it must be flowable. However, when external forces blablade, it should be as a plastic, so that in the forms it did not trickle down.

Specific substances that meet these requirements are:

- bentonites, i.e. clay impurities resulting from weathering vulkanicheskogo tuff, in particular "Antony",

- highly dispersed silicic acid, i.e., silicic acid with a content of silicon dioxide above and 99.8 wt.%, the resulting hydrolysis of silicon tetrachloride in oxygen-hydrogen flame, in particular "Aerosil",

a mixture of (a) silicic acid and (b) dimethyl sulfoxide, polyoxyethyleneglycol and its derivatives, in particular siloxane end groups, or polyethylene fibers, in particular mixtures of amorphous silicic acid with fibrillated polyethylene fibers (Sylo - thix-53),

- utverjdenie castor oil as such or with ethylene-bis-stearamide or bis(steal.

Furthermore, it should be called the lithium chloride, carbon black, a mixture of polyamidoamine and low molecular weight amines (see German patent DE 40 23 005), fine politician from aliphatic or aromatic polyamines and isocyanates, as well as the in situ derived isocyanate.

Suspendisse agent is used in an amount up to 10 wt.%, in particular 0.5 to 5% based on the polyol. By increasing the portion of dust in a mixture of gravel and sand should also increase the proportion of a suspending agent, which will lead to improved wetting of dust, as well as to improved binding particles in the uncured and utverzhdenii mixture of isocyanate and polylateral reactive resin with granular material. The result is a decrease in the content of dust in the air and increase the sustainability of the molded product during storage in water. Suspendisse agent is also preferably added to the polyol.

Isocyanate and polycladida resin may also contain other additives, including first of all the fillers, serving not only to increase the volume and to improve the technical characteristics, such as yield strength. Suitable fillers are caponata, in particular lime feldspar, limestone, chalk, lift barium and calcium sulfate, oxide and hydroxide, for example, alumina, oxide hydrates aluminide, silicates, such as kaolin, feldspar, mica, clay and talc, and silicon dioxide (quartz flour, diatomaceous earth, graphite or fiberglass. Fillers are also preferably added to the polyol, in an amount up to 70 weight%, preferably 10-60 wt.% in terms of resin.

The polyol also add the tool to bind water, in particular alkaline aluminosilicate (pasta brand "Zeolith L"), in an amount up to 10 wt.%, preferably 1 to 5 wt.% in terms of the polyol.

The polyol may also contain additives, such as, for example, dispersing agents, thickeners or thixotropic substances, if the properties suspendresume agent in this regard is poor.

As further additives can be used: pigments, fire tools, stabilizers for improving the adhesion means, etc.

Depending on the specific purpose it can be appropriate to stabilization of polyurethane to decay. As antioxidants are suitable in particular to 1.5 wt.% product lrganox 1010, 1076, 3114 or 1425" company "Ciba Geigy", product "Topanol 0" the company "ICI" or product "Goodrite 3114" company "Goodrich".

As scavengers 3035" company Sandoz and product Chimassorb 81" company "Chimosa".

As light stabilizers with spatial difficulties, made on the basis of amines, it is possible to apply up to 1.5 wt.% product Tinuvin 765 or 770" company "Ciba Geigy", product "Sanduvor 3050, 3051 and 3052" company Sandoz, product Chimassorb 119" company "Chimosa" and product "LA Mar 62, 63, 67 or 68" company "Argus Chemical Corporation".

Additives are mixed in the polyol in a known manner, you get a so-called resin. The polyisocyanate can also be additive, although this is normally not done, i.e., the curing agent preferably consists of MDI.

There is, of course, the application of several polyols, polyisocyanates, catalysts, suspendida agents and additives of the same functions.

Isocyanate - and polycladida reactive resin as an organic binder is used instead of the commonly used inorganic binders such as cement. Filler and additives similar to those used in the field of building materials.

B as placeholders apply granular materials, particularly minerals, which are collapsed and/or neopushennye breed. In addition to the granular nature of their chemical composition is of only secondary importance is around, silicon carbide, metals, solid or hollow beads of glass or plastics, expanded clay, vermiculite, perlite, pumice gravel, or slag. Preferred silicon dioxide in the form of sand and gravel. Particularly suitable silica sand containing quartz above 85%. Its grains are mostly rounded with a diameter of 0.06 to 2 mm Corresponding materials with a diameter of particles > 2 mm are called gravel. For the present invention is of particular importance fine gravel size grains, equal to 2 - 6,3 mm

Preferably used a mixture of sand and gravel, the maximum particle diameter is 6.3 mm, preferably 4 mm, the Decisive characteristic of the invention is the fact that you can also use granular materials with a diameter of less than 1 mm, in an amount up to 10 wt.%. Half of this may consist of particles with a diameter less than 0.2 mm, so there is the possibility of using a mixture of gravel and sand, the dust content is 5 wt.%. Determination of particle size distribution by prominent by sieve analysis.

However, the high content of fine-grained and medium-grained sand reduces the permeability. By changing this content can be accurately set the desired water is in the ratio of 1: 1 and the reactive resin is practically waterproof. Proportion of dust can also be used as filler be included in the isocyanate - and polylateral reactive resin.

So, in case a suitable particle size distribution of the grains of the initial mixture of gravel and sand should only be washed in order to remove, for example, all organic and all nabukenya components. The filtration dust-like material is not in any case necessary. The washed mixture of gravel with sand is dried with hot air and stored in storage under normal conditions of environment. A mixture of gravel with sand, however, before storing preferably mixed with a part of the polyol, in particular if pelestarian in the mixture is high. The polyol may contain other components, such as, for example, fillers, suspendresume agents and catalysts. The result of this preprocessing is complete wetting of the mixture of gravel with sand and dust, so full coverage of individual particles. Thus not only reduces the dust content in the air during the manufacture of molded products, and also increases the stability of the molded articles to the action of water at rest.

The weight ratio of silica sand with a polyurethane binder preferably with the capacity of water flow 0 m3/minm2equal weights of silica sand and a binder. When using sand size grains up to 4 mm, but 20 wt.% content particle size of less than 1.6 mm in terms of the total number of sand - the proportion of the binder to the same type of filter is reduced to about 10 wt.% in terms of the total number of sand.

As additives for additional effects can be applied such substances as, for example, in the concrete. Added, for example, pigments for coloring, glass fiber for amplification, substances with sharp edges to obtain the effect of determine grip.

Molded products with open pores are made from isocyanate and polylateral reactive resin, granular materials and, optionally, further additives, in principle, by a molding method.

For the manufacture of molded products first dispense and mix the two component isocyanate - and polylateral reactive resin, so as the first component is a polyol with catalyst, suspenders agent and, optionally, further additives, and the second component is a polyisocyanate.

Typically, the isocyanate - and polyols eshivot at room temperature before when solids mocheni resin. Resulting molding composition without pressure when shaken, poured into molds of the desired size. When using oblong forms work under pressure, for example 15 n/cm2may be predominant. In addition, to strengthen you can attach the fleece, woven or Mat of glass or metal. Further there is the possibility of applying the surface layer of decorative material, such as white pebbles. In addition, you can include a layer of granulated activated carbon, to create a barrier layer in the molded product. Form, as a rule, not heat. They are equipped with a standard obtained in the sale of grease.

For curing forms contained in the mass is heated to a temperature of 80 - 150oC, for example in an oven with air circulation. The term heat - up to 2 hours, preferably up to 1 hour, in particular up to 10 minutes. When this period starts with the filling of the molding material in the form and ends with the extraction of products from forms.

It is advisable to extract the product form is not cooled to 25oC, preferably up to 50oC, and in particular not cool, so removing the carry virtually at reactionary so, what possible trouble-free treatment, including not only the extraction of products from forms, but also transport, storage and, if necessary, rework products. The strength of the molded product during the day even after molding is significantly increased. The duration of dauvergne depends on the temperature at which the products are stored, moisture (humidity, liquid water) and the dimensions of the molded product.

Forms are permanent forms that require cleanup after each use, but only after 10 times or even 20 times of use.

Machine for manufacturing molded parts preferably designed for semi-automatic process.

Made in this way, the molded products have excellent properties, is primarily based on a polyurethane binder and its distribution in a granular material.

Polyurethane binder practically inert with respect to water. The water quality even after 7 days of contact does not change. This applies not only to the color, smell, transparency and surface tension of water, and first of all to the content of amines. Molded products are therefore suitable for ispolzovala so, what is the ERP system. Pore volume is 30 - 50% vol. in terms of the volume of the molded products. Accordingly, the molded products are up to 50% lighter than compact molded product of the same size, made with the use of cement as a binder. thermal conductivity is also reduced through the day.

The ERP system is open, i.e., the molded product is permeable to gases and liquids, such as, for example, liquid or gaseous water, air or polar liquid. The permeability can be almost 0, but can also be high, even at low or even no pressure, it means that rainwater can be absorbed without stagnation.

The permeability can purposefully be varied by appropriate choice of particle size and grain size distribution of the grains. This refers to the total pore volume, and raspredeleniya values then at the intersection of the moulded products. Such an asymmetric pore system can be obtained, for example, by spraying on a layer of medium-grained material (the size of grains of 1 - 3 mm) of the second layer of coarse material (the size of grains 3 -10 mm). The layer of fine-grained material (0.3 to 1.0 mm) must be very thin, otherwise processaudio in a granular material of good mechanical properties. Whereas organic binder, the strength of the molded products are unusually high. This refers to the compressive strength, tensile strength, and Flexural strength. Impact strength is extremely high. If, however, for certain purposes, these values are insufficient, there is a chance of them improving by means of amplifiers. High values of strength for many years to maintain at a constant level by selecting suitable starting materials and by adding stabilizers. So, for example, resistance to hydrolysis can be greatly improved by using a simple polyester polyol instead of a complex of the polyester polyol.

Thanks to these valuable properties molded open-cell foam, they are suitable for use in areas where you have no pressure to remove the permeate, for example water, by absorption, as well as in areas where the molded product is under high pressure, such as in deep wells.

Example 1.

The mixture of isocyanate and polylateral reactive resin derived from polyol components with additives (resin) and MDI (hardener). The resin consists of 33 wt.% polipropilende, 10 wt.% butil-tin.

3 weight. including the above resin at room temperature using a dynamic mixer is mixed with 1 weight.h. MDI, i.e. difenilmetana-4,4-diisocyanate functionality of 2.7, to obtain the isocyanate - and polylateral reactive resin.

From 1 weight. including isocyanate and polylateral reactive resin and 16 weight. including a mixture of gravel with sand at room temperature by mixing with shaking made molding. A mixture of gravel with sand contains 95 wt.% particle diameter of 1 to 4 mm, and 5 wt.% particles with a diameter less than 1 mm

Molding at room temperature and with shaking fill in the form with a coating of Teflon. In addition, the treatment is carried out at a certain pressure.

Curing is carried out at a temperature of 140oC for about 10 minutes in an oven with air circulation. After cooling to room temperature the product is removed from the form.

Example 2.

The variation in temperature curing at 2 mixing speeds

A) Isocyanate - and polycladida reactive resin.

a) Resin, wt.%:

Polypropylenglycol, a hydroxyl number of about 280, difunctional the lo 5,00

The silicate of sodium castor oil (mixture in ratio 1:1) - 6,00

Silicic acid (Aerosil 150) - 2,00

Dilaurate dibutil-tin - 0.02

Limestone - 45,98

b) curing agent, wt.%:

The difenilmetana-4,4'-diisocyanate - 100,00

The ratio of resin and hardener: - 100:30

200 g of the resin and 60 g of hardener in a tin with a diameter of 10 cm metal blade agitator with electric actuator (width of blade = 4 cm) is stirred for 1 minute at room temperature (23oC), after which the mixture utverjdayut at different temperatures.

Isocyanate - and polylateral reactive resin immediately after mixing in the form of a rectangular strip with a length of 10 cm, a height of 1 mm and a width of 1 cm using a doctor blade put on fat-free steel sheet heated to a temperature of curing. The sheet immediately after applying resin vertically placed in a drying Cabinet, so that the strip reactive resin is in the horizontal position. After 10 minutes of curing is shown in the following tables temperatures determine the path that reactive resin flowed down.

After this experience in the above recipe made 2 diminno at 100 rpm./rpm and 1000 rpm./min (see table. 1).

The path that the reactive resin flows down on the leaves, is the size of its ability to wetting. Increasing the stirring speed to 1000 rpm./min, according to the data given in the table, you can increase the viscosity reduction.

B) a Mixture of reactive resin and a mixture of gravel with sand.

A mixture of gravel with sand and isocyanate - and polylateral reactive resin (in the ratio 16:1) is stirred by means of a screw mixer and served in the form of a height of 1 m at the temperature of molding, 25oC and 80oC. From the top of the form drains a large number of isocyanate and polylateral reactive resin. Of hardened filter tube at the upper end of the hand you can just break parts. In the bottom half of these pipes the resin concentration is much higher, and the speed of water flow in the lower third of the pipe is almost 0 m3/min. m2.

In contrast to these two experiments at a temperature of 130oC for 10 minutes to produce the filter tube with an almost uniform distribution of resin throughout the height of the pipe.

Example 3.

The variation of the suspending agent.

In two experiments compared the number of "Aerosil 150" replace limestone flour, reactive resin, squeegee applied at a temperature of 25 to 130oC flows down the list for more than 15 see Continuing the reaction as such cannot compensate for the decrease in viscosity as a result of mixing and temperature increase in the size of the reaction in combination with the product "Aerosil". If, however, the 0.5% limestone flour is replaced by the product "Aerosil", then at a temperature of 130oC reactive resin not flowing down.

With the amount of product "Aerosil" above, and less than 2% in a production installation manufacture fit the filter tubes is not possible. In the first case the distribution of the reactive resin in the filter is very uneven. A small concentration in the upper part and a large concentration in the lower part will lead to different values of the strength and speed of water flow. In the second case, the filter has no strength. In the absence of fluidity education places adhesion between individual particles is unsatisfactory.

Example 4.

Varying the concentration of the catalyst.

The above resin (see example 2A) are made with the use of a catalyst (dilaurate dibutylamine), taken in an amount of 0.015, 0,023 0,018 and%. and Poole, containing 0,020% of the catalyst. The number of revolutions of the mixer when mixing the isocyanate with the polyol is about 100./minutes as described in example 2A to the method of measuring the receive path (see tab. 2), which are subjected to the experience of the resin flowing down (indicated in cm):

At a temperature of forms equal to 130oC, the system containing the catalyst at a concentration of 0,023 0,018 and%, are made filter tubes.

In the material containing the catalyst at a concentration of 0,018%, there are significant differences in the distribution of the reactive resin. Particularly striking is the high concentration of resin in the lower 20 cm of the filter tube. The concentration of catalyst equal 0,023% get uniform distribution of the reactive resin, but the strength of the pipe is very low. Already when removing items from forms part Villevalde. Analysis of the structure of the filter tubes reveals that the adhesion between the individual particles of gravel poorly executed. The viscosity of the system at the moment of perfect filling the form was too strong.

For the manufacture of filter tubes in practice, the temperature of curing, suspendisse agent and concentration of the catalyst will agree with predefined ratio components.com using a screw mixer in the production facility at the laboratory model by mixing the reactive resin a speed of 100 rpm./minutes

Comparison of experiments in the laboratory with the manufacture of filter tubes in a production setting reveals that for the manufacture of filter tubes with a uniform distribution of the strength of a certain system behavior against Oceania. When applying reactive resin by the method used in the laboratory experiments, the required value is the path Oceania, 0.3 - 0.6 cm at a temperature of 130oC.

The examples show that when a certain combination of polyols, polyisocyanates and additives to obtain uniform distribution of the polyurethane in the target product of the concentration of the catalyst and suspending agent can be varied only within very narrow limits, which in each case can be set a few standard tests. Getting such different viscosities, due to a sharp temperature change and shift, was unexpected.

1. Isocyanate - and polycladida reactive resin containing a polyol, a polyisocyanate, a filler, suspendisse agent, water-bonding agent and a catalyst, characterized in that it contains a polyisocyanate in an amount up to 50% excess of isocyanate in perestelo, suspendisse agent in an amount up to 10 wt.% in terms of polyol, water-bonding agent in an amount up to 10 wt.% in terms of the polyol and the catalyst in amounts of preferably from 0.01 to 0.5 wt.% in terms of the polyol, and the amount of catalyst and suspending agent agreed immediately after receiving resin, is applied in the form of a rectangular strip with a length of 10 cm, a height of 1 mm and a width of 1 cm on pre-heated to a temperature of curing fat-free steel sheet, placed immediately after the application of the strip in a vertical position in an oven at ensuring horizontal stripes flowing down within 10 minutes: (a) at a temperature of 25oC for at least 15 cm and (b) at a temperature of 130oC at 3-0,3 see

2. Isocyanate - and polycladida reactive resin under item 1, characterized in that the catalyst contains ORGANOTIN compound with a molecular weight of more than 250.

3. Isocyanate - and polycladida reactive resin on PP. 1 and 2, characterized in that as a suspending agent contains a silicon-containing substance.

4. Isocyanate - and polycladida reactive resin on PP. 1-3, characterized in that cachet points:

18.06.93 on p. 3;

16.03.94 on PP. 2 and 4;

09.06.94 on p. 1.

 

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