Method of production of the pigment for manufacture of the cardboard and paper

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium carbonate is treated with aluminum sulfate in the aqueous medium. The treatment is conducted at aluminum sulfate consumption of 25-105 % to the mass of absolutely dry calcium carbonate at the temperature of 80-85°С during 90-180 minutes with production of the suspension containing 25-35 % dry substances in it. At that they use the aqueous medium containing the binding chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-3.0 mass % from the mass of the absolutely dry pigment, and-or the water soluble colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The suspension is additionally dried and grinded. The technical result of the invention is the improved quality of the pigment as well as expansion of its field of application.

EFFECT: the invention ensures the improved quality of the pigment as well as expansion of its field of application.

2 tbl

 

The invention relates to the production of pigments, as well as to the technology of making paper with filler, coated paper and cardboard.

At the present time in the manufacture of paper and paperboard much attention is paid to the development of pigments to improve the optical and mechanical characteristics of the paper filler and coating on the coated paper and cardboard. Developed technology that enables the receipt of pigments in powder form with their subsequent use in various industries.

A method of processing calcium carbonate sodium hexametaphosphate and phosphoric acid. The purpose of this method is to obtain calcium carbonate, resistant to acidic environment (US 5043017, NCL 106-494, 1991).

The closest analogue of the proposed method to obtain pigments is a method of obtaining stable in the acidic environment of the composition of calcium carbonate and aluminium salts (US 5599388, NCL 106-464, 162-181 .2, 162-181 .3, MCL 09 With 1/02, 1997). This method consists in preparing a mixture of calcium carbonate salt of aluminum in an aqueous medium in the past number of from 0.5 to 10% by weight of dry calcium carbonate. As salt can be used aluminum sulfate, and calcium carbonate is used in the form of dispersion, and aluminum sulfate in aqueous solution.

However, the product of the s, obtained by these methods are intended only for use as a filler in the production of neutral or weakly acidic papers. As a component of coating or any other formulations products can not be used.

A positive result from the use of the present invention to provide stable in acidic environments pigments with high white or dyed in any color, modified binder, selected from the group consisting of starch and polyvinyl alcohol (PVA), and is suitable for use in the production of different types of paper and cardboard as a filler and as a component in coating compositions.

In addition, these pigments, including modified binders, can be obtained in the form of fine powder, suitable for redispersion without loss of properties of pigment.

Properties of pigments allow their use in other industries, for example, as a filler for polymers used in paint industries, including the manufacture of paints for painting, etc.

Set a positive effect is achieved by the fact that in the proposed method of obtaining a pigment for making paper and paperboard, including processing of calcium carbonate aluminium sulphate in the aquatic environment, according to the invention on which the processing is carried out at a flow rate of aluminum sulfate 25-105% by weight of absolutely dry calcium carbonate at a temperature of 80-85° For 90-180 minutes to obtain a suspension with a solids content in her 25-35%, with use of an aqueous medium containing a binder selected from the group consisting of starch and polyvinyl alcohol (PVA), in the amount of 0.5 to 3.0% by weight of absolutely dry pigment, and/or a water-soluble dye in an amount of 0.1 to 0.5% by weight of absolutely dry pigment.

The resulting suspension may optionally be dried to obtain a powder.

The method is as follows. In the reactor-mixer equipped with a high-speed stirrer and steam jacket, serves a specified amount of water containing in solution a specified amount of the binder is starch or PVA and/or dye. Then with vigorous stirring in a given number of serves powder of calcium carbonate and after the filing of the dispersion is stirred for 5-10 minutes. Next, to the resulting dispersion with stirring, slowly add a solution of aluminum sulfate containing a given quantity of aluminum sulfate in the form of Al2(SO4)3·18H2O. After the filing of a solution of aluminum sulfate, the temperature of the mixture in the reactor was raised to 80-85°and the mixture at this temperature and vigorous stirring withstand 90-180 minutes. The result is a dispersion of a pigment, the modified binder and/or a dye, the content of the m dry matter 25-35%.

This dispersion can be used directly, for example, in the manufacture of paper filled with or in obtaining coating compositions. In other cases, the dispersion is subjected to drying the layer at a temperature of 80-85°and then crushed into a fine powder or spray drying.

Physico-chemical processes occurring in the reaction mixture can be represented as follows.

In the reaction of aluminum sulfate with calcium carbonate, the excess of the latter, in the reaction mixture of aluminum sulfate ultimately consumed completely. As a result of this reaction is a pigment, the modified binder and/or a dye. The pigment has a high stability in systems with acidic pH values. The pigment particles are not larger than the particles in the original calcium carbonate. For example, when used as raw material of precipitated calcium carbonate particle size of the pigment is less than 2 μm with a primary size of less than 1 μm. Pigment not containing the dye has a high whiteness. The pigment, the modified pigment may be of any color. The intensity of this color is high.

In addition, the pigments, including modified binder, dried, for example, in the layer, easily crushed into a powder with a particle size of about 1 micron and again redispersible in the water be the loss of their properties to obtain pigment dispersions with a concentration of 40-45%.

These characteristics improve with increasing degree of conversion of calcium carbonate in the reaction with aluminum sulfate, that is, with increasing consumption of aluminum sulfate per unit mass of calcium carbonate up to their stoichiometric ratio (1,112 weight. part of aluminum sulfate to 1 part of calcium carbonate).

The ability of the pigment particles to keep substances such as starch, PVA, dyes, due, apparently, a strong polar interaction of the pigment with the water molecules and the appropriate structuring of large amount of water layer in the hydration shells around the particles of pigment in their education or redispersion powder pigment, the modified binder and/or a dye. Even after repeated dilution of the system and vigorous stirring of the water shell structured particles are not washed away.

Conditions of carrying out the method according to the examples shown in table 1, characteristics of products are shown in table 2.

Product used in the production of paper or cardboard, may be the dispersion of the pigment obtained in the reaction of calcium carbonate with aluminium sulphate in an aqueous medium containing a binder and/or a dye, dry pigment powder obtained from this dispersion, and the suspension obtained in reisberg is the formation of pigment powder. The product is diluted, for example, with the introduction of pigment into pulp as a filler or mixed with another component (dispersing agents, pigments, binders and the like) during the formation of coating compositions with different compositions and total concentrations of dry matter and, consequently, with different physical parameters (e.g., viscous properties). Accordingly, as the characteristics of the products we have chosen the stability of the dispersions without the addition of stabilizers (yield variance within 24 hours, expressed in % by weight dispersion) at a pigment concentration of 25% and above, the ease of grinding pigment, dried layer at 75°With, the presence or absence of nesmolkaemyh agglomerates in the crushed powder, the particle size of the powder, the possibility of redispersible powder without loss of properties of the pigment, optical white powder, not containing dye, the degree of retention of the pigment binder and/or dye.

The degree of retention is determined as follows. A certain amount of the obtained dispersion of the modified binder and/or dye pigment is mixed by a high-speed stirrer with a certain amount of water. Diluted several times the variance of stand alone before the separation. The bottom layer is a free-floating sediment, and the second transparent, not the content is of ASI mist water layer. In this layer determine the binder content and/or dye. Then recalculation on weight of solids of pigment taken on the dilution of the sample variance determine the amount of binding and/or dye, as associated with the pigment and the aqueous phase pigment. The degree of retention of the binder and/or dye with multiple diluting the dispersion with water expressed in % of the number of binders and/or dye, filed with the system in the process of preparing a modified pigment.

Thus, the proposed method allows to obtain calcium carbonate pigments, modified binders (starch or PVA), and/or dyes of any color. The pigments can be dried and easily crushed into a powder with particle sizes of less than 2 microns. The powder can be redispersible while maintaining the properties of the pigment. A high degree of retention of the pigment binder and/or dye and other properties of the pigments allow you to use them in various fields.

Table 1.

Conditions of carrying out the method according to the examples.
no examplesThe amount of calcium carbonate, gThe amount of aluminum sulfate (SA) in water Al2(SO4)3·18 H2O, gThe mass ratio of CA to the weight of caso , %Process temperature, %The process duration, minThe degree of conversion of caso3, %The output of the pigment on the total mass of CA, caso3gBinder and its estimated number, gThe estimated amount of dye, gThe pigment concentration in the dispersion, %
15012,525809022,588,5PVA 0,277-35
25022,2544,5801004084,20PVA 0,456Direct blue 0,05535
35027,82of 55.64851205081,45-Direct Bordeaux 0,3230
45041,7383,46851807576,80Starch 1,4-25
55052,50105,0851809575,20Starch 2,31Direct orange 0,2 25

Table 2.

Characteristics of samples of pigment examples
no examplesThe stability of the dispersion within 24 hours. (yield in % by weight dispersionEasy grinding the dried dispersion in powderAgglomerates in the powderThe particle size of the powder, micronThe possibility of redispersible powderOptical white white pigment, %The concentration of binder in a dry pigment, %The concentration of dye in a dry pigment, %The degree of retention of the binder, %The degree of retention of the dye, %
1<1Without difficultyNo<2Without difficulty86,47PVA 0,5-99,90-
2-"--"--"--"--"--PVA 0,750,199,9099,8
3-"--"--"--"--"---0,5-99,4
4-"--"--"--"--"-88,31Starch 2,0-98,4-
5-"--"--"--"--"--Starch 3,00,25of 97.899,7

1. The method of producing the pigment for the manufacture of paper and cardboard by treating calcium carbonate with aluminum sulfate in an aqueous medium under stirring, wherein the treatment is carried out at a flow rate of aluminum sulfate 25-105% by weight of absolutely dry calcium carbonate at a temperature of 80-85°for 90-180 min to obtain a suspension with a solids content in her 25-35%, with use of an aqueous medium containing a binder selected from the group consisting of starch and polyvinyl alcohol in the amount of 0.5 to 3.0% by weight of absolutely dry pigment and/or a water-soluble dye in an amount of 0.1 to 0.5% by weight of absolutely dry pigment.

2. The method according to claim 1, characterized in that the suspension is optionally dried and milled.



 

Same patents:

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide suspension is treated with aluminum sulfate solution in the aqueous medium at stirring. The treatment is conducted in the aqueous medium containing the binding in the dissolved state. The binding is chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-5.0 mass % from the mass of the absolutely dry pigment, and-or the colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The technical result of the invention is the improved quality of the pigment and expansion of its field of application.

EFFECT: the invention ensures the improved quality of the pigment and expansion of the field of its application.

2 tbl

FIELD: pulp and paper industry; methods of production of the composite pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the composite pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide is mixed with kaolin and added with aluminum sulfate in the aqueous medium at stirring. The aqueous medium contains the binding chosen from the group, which includes starch and polyvinyl alcohol in amount of 1.5-5.0 % from the mass of the absolutely dry pigment, and-or the water soluble colorant in amount of 0.1-0.5 % from the mass of the absolutely dry pigment. The technical result of the invention is the improvement of the composite pigment quality and expansion of its field of application.

EFFECT: the invention ensures improvement of the composite pigment quality and expansion of the field of its application.

2 tbl

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.

EFFECT: improved quality of pigment at lower cost and extended application area.

3 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: when ground paper is manufactured, it is coated with ink-accepting coating. The latter contains latex binder, water-soluble binder, pigment mixture of amorphous silica with colloidal cationic silica and colloidal alumina, and ink-fixing agent. Coating operation is performed in two steps, weight ratio of coating applied in the first step to that in the second step ranging from 0.34:1 to 0.66:1. Reverse face of base paper is coated by detwisting coating. Further, coating is ennobled via superglazing at pressure in supercalender roll gap 30-75 bar.

EFFECT: improved workability of process and improved quality of paper due to increased surface strength.

4 cl, 7 ex

The invention relates to thermosensitive recording materials, in particular paper and taking into account the major area of application is the production of business and securities can be attributed to the means of their protection against forgery

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

FIELD: manufacture of a tub-sized paper or board sheet, applicable in wood-pulp and paper industry.

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9 cl

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.

EFFECT: improved quality of pigment at lower cost and extended application area.

3 tbl

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34 cl, 9 tbl, 2 ex

Finishing agent // 2160805

The invention relates to the pulp and paper industry, in particular the production of paper with surface treatment as pigmented and non-pigmented

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide suspension is treated with aluminum sulfate solution in the aqueous medium at stirring. The treatment is conducted in the aqueous medium containing the binding in the dissolved state. The binding is chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-5.0 mass % from the mass of the absolutely dry pigment, and-or the colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The technical result of the invention is the improved quality of the pigment and expansion of its field of application.

EFFECT: the invention ensures the improved quality of the pigment and expansion of the field of its application.

2 tbl

FIELD: pulp and paper industry; methods of production of the composite pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the composite pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide is mixed with kaolin and added with aluminum sulfate in the aqueous medium at stirring. The aqueous medium contains the binding chosen from the group, which includes starch and polyvinyl alcohol in amount of 1.5-5.0 % from the mass of the absolutely dry pigment, and-or the water soluble colorant in amount of 0.1-0.5 % from the mass of the absolutely dry pigment. The technical result of the invention is the improvement of the composite pigment quality and expansion of its field of application.

EFFECT: the invention ensures improvement of the composite pigment quality and expansion of the field of its application.

2 tbl

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: calcium carbonate product is designed for containing paper and comprises mixture of first and second separate calcium carbonate particles, wherein difference between first and second calcium carbonate particles ranges from about 0.1 μm to 0.2 μm and weight ratio of first to second particles lies between about 50:50 and about 80:20. Pigment is intended for coating paper and made from above-defined product. Method concerns containing paper and comprises preparation of mixed pigment based on calcium carbonate precipitated in the form of aragonite having above-indicated makeup; addition of binder; and deposition of the pigment onto a base paper in the form of binder-containing suspension. Paper is then dried and calendared. Also described are: paper obtained by above method; a method to increase gloss of paper sheet involving operation of including above product into base paper coating suspension; a method to increase gloss of paper involving operation including calcium carbonate product wherein first calcium carbonate particles have average size about 0.4 μm and the second ones about 0.5 μm at their weight ratio 60:40, respectively; a method to increase gloss of paper sheet involving operation of including pigment based on argonite-type calcium carbonate with difference between first and second average particle size values from about 0.1 μm to 0.2 μm and their weight ratio between about 50:50 and about 80:20 into base paper coating suspension.

EFFECT: increased gloss of coated paper sheets.

24 cl, 3 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.

EFFECT: improved quality of pigment at lower cost and extended application area.

3 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: when ground paper is manufactured, it is coated with ink-accepting coating. The latter contains latex binder, water-soluble binder, pigment mixture of amorphous silica with colloidal cationic silica and colloidal alumina, and ink-fixing agent. Coating operation is performed in two steps, weight ratio of coating applied in the first step to that in the second step ranging from 0.34:1 to 0.66:1. Reverse face of base paper is coated by detwisting coating. Further, coating is ennobled via superglazing at pressure in supercalender roll gap 30-75 bar.

EFFECT: improved workability of process and improved quality of paper due to increased surface strength.

4 cl, 7 ex

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