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. 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

 

The invention relates to the production of pigments, as well as to the technology of making paper with filler and 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 provides the ability to centrally receive pigments in powder form with their subsequent use in various industries.

A method of obtaining white pigment by treating the aqueous dispersion of calcium hydroxide aluminium sulphate at their technometrics relation to the receipt of silicates of calcium - sativas (U.S. Pat. U.S. No. 3615768, NCL 106-306, 1971).

However, obtained by this method variance is not subject to drying, because the pigment in the drying even in mild conditions loses its optical and mechanical properties due to the formation of cemented aggregates.

The closest analogue to the proposed method of production of a pigment is a method of obtaining a pigment for making paper and paperboard, consisting in the preparation of an aqueous suspension of calcium silicates (sativas) by treatment with calcium hydroxide is a Ulfat aluminum, add to this the natural dispersion of the inorganic component of kaolin and removal of water by drying, preferably by spraying, to obtain powders of pigment - mechanical mixture of sativas and kaolin content sativas 10-30% of the weight of the mixture. The powder then redispersion in water in the preparation of coating compositions.

In the known method does not provide for the possibility of modification of the pigment binder and/or dye in the process of redispersible powder (see US No. 3876443 And N. CL. 106-306, IPC 7 09 With 1/02, publ. 08.04.1975).

New positive result when using the present invention is to give the pigment new properties through the modification of the binder and/or a dye that provides an opportunity to expand the scope of its application in the manufacture of various types of paper and cardboard - the introduction of the pigment not only in coverage, but in the pulp.

Set a positive effect is achieved by the fact that in the proposed method of obtaining a pigment for making paper and paperboard, comprising a mixture of calcium hydroxide, aluminum sulfate and natural inorganic component in the dispersion in water, drying the resulting product and the receipt of the powder and its dispersion in water, as a natural inorganic component, use the calcium carbonate, in this first prepared by stirring a mixture of calcium hydroxide with calcium carbonate at a ratio of these components respectively from 1.0:2.2 to 1.0 to:12,9, and then to the resulting dispersion mixture gradually add aluminum sulfate at a ratio of the latter to the total mass of calcium hydroxide and calcium carbonate from 1.0:0.85 to 1.0 to:4,30, then the temperature of the mixture was raised to 80-85°and the reaction mixture is maintained under stirring for 90-180 minutes with the formation of the pigment dispersion with a solids content of 20-35%, and the additional dispersion of the powder is carried out in water containing a water-soluble dye and/or a binder selected from the group consisting of starch and polyvinyl alcohol (PVA) when the content of the dye of 0.2-0.6% of the dry weight of pigment and binder 1.0 to 4.0% by weight of solids of pigment.

The method is as follows. In the reactor-mixer equipped with a high-speed stirrer and a device for heating, for example, steam jacket, serves a specified amount of water, then with vigorous stirring gradually fed in the form of powder or dispersion of the specified quantity of calcium hydroxide and calcium carbonate, the dispersion is stirred for 5-10 minutes and to the resulting dispersion gradually add the desired amount of solution of aluminum sulfate containing for the data amount of aluminum sulfate in the form of Al 2(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 under vigorous stirring withstand 90-180 minutes. Get the pigment dispersion with a solids content of 20-35%, which is dried in a layer at a temperature of 50-75°and then crushed into powder or spray dried.

Before using pigment specified amount redispersion in a certain volume of water containing specified amounts of dissolved dye and/or a binder is starch or PVA - under vigorous stirring and gradual supply of powder pigment. The stirring is continued for 30-40 minutes. In the end you get the variance of the modified dye and/or pigment with a binder concentration of dry substances 30-40%.

Physico-chemical processes upon receipt of the pigment can be represented as follows.

Under vigorous stirring in water with aluminum sulfate, calcium hydroxide and calcium carbonate in the system there are two reactions: the reaction of interaction of aluminum sulfate with calcium hydroxide, passing with a very high speed, and slow response of the interaction of aluminum sulfate with calcium carbonate, the speed of which increases significantly with increasing t is mperature. Accordingly, the calcium hydroxide in the system at the beginning of the process completely reacts with aluminium sulphate with the formation of an appropriate number of silicates of calcium - sativas.

In the reaction of aluminum sulfate with calcium carbonate with an excess of the latter in the reaction mixture of aluminum sulfate ultimately consumed completely. As a result of this reaction is a white pigment, for some characteristics similar to sativas. For example, he has a high whiteness, high stability in systems with acidic pH values, has a particle size in the range of not more than 2 μm, has the ability to modification of the dye and/or a binder. These characteristics improve with increasing degree of conversion of calcium carbonate in the reaction with aluminum sulfate.

In addition, the product of the reaction of calcium carbonate with aluminium sulphate, dried layer, easily crushed into a powder with particle sizes of less than 2 microns and again redispersible in water to obtain a low viscosity dispersion with a pigment concentration up to 40% of dry substances.

When the joint receipt of sativas and converted to calcium carbonate pigment also easily crushed with a share of sativas in its composition to 45%. The powder is well dispersed with preservation of the characteristics of the pigment.

The process of policedepartment on this proposal is preferably carried out when the temperature of the reaction mixture 80-85° C.

To obtain pigments with a higher degree of conversion of calcium carbonate requires a longer process. The maximum degree of conversion of calcium carbonate (100%) is achieved at the expense of aluminum sulfate 1,112 wt. parts 1 wt. part of calcium carbonate, that is, when the stoichiometric consumption of the components in the reaction of calcium carbonate with aluminium sulphate to complete the termination of allocation of CO2.

The ability of the pigment particles to retain their hydration shells substances such as starch, PVA, water-soluble 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 the pigment not only in the moment of their formation in the respective reactions, but also when redispersion powder in water. The pigment dispersions with a concentration of dry substances of 20% or higher, with the average size of the pigment particles of about 1 micron in the water phase is in the structured condition. Even after repeated dilution of the system and vigorous stirring of the water shell structured particles are not washed away. And if the water is in the process of redispersible of pigment powder contains dissolved state of any substances, these substances is nazyvautsa in the "associated" particles of pigment condition.

The process conditions for the proposed method are given in table 1, the characteristics of the samples in these examples is in table 2.

The pigment is dried at 75°in the layer, grinding the pieces is carried out in a porcelain mortar.

In powders determine the presence or absence of cemented agglomerates. In all the samples in the examples according to the invention, the powders do not contain cemented agglomerates.

As the characteristics of the modified pigments are used, the degree of retention of pigment, dye and/or a binder which is defined as follows.

A certain amount of dispersion of a modified pigment is mixed by a high-speed stirrer with a certain amount of water. The diluted dispersion stand alone before the separation. The bottom layer is a free-floating sediment dispersion and the upper transparent that do not contain suspended solids aqueous 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 of the dispersion. The degree of retention of the pigment binder and/or dye with multiple diluting the dispersion with water expressed in % of submitted ICI is he in the process of preparing a modified pigment amounts of the binder and/or dye.

Thus, the proposed method allows to obtain pigments, modified binder and painted in any color, while maintaining the mechanical and physico-chemical properties of the pigment and provides a wider scope.

Table 1
The process conditions for the proposed method
no examplesCalcium hydroxide CA(Oh)2gCalcium carbonate, caso3gAluminium sulphate (SA) Al2(SO4)3·N2O, gMass. the ratio of CA(OH)2CaCO3Mass. the ratio CA CA(Oh)2+Caso3Process temperature, °The process duration, min
113,6429,2849,771:2,21:0,8585180
210,2329,2544,631:3,861:0,8885160
3charged 8.5254,7832,061:to 6.431:1,9780120
46,8284,621,41:1,4 1:4,308090
53,443,9148,991:12,91:0,9680100

Table 2
Characteristics of the pigment dispersions obtained by the proposed method
no examplesShare sativas in the mass of pigment, %The concentration of the pigment in redispersion, %BinderThe concentration of binder by weight of the pigment, %The concentration of dye on weight of pigment, %The degree of retention of the binder, %The degree of retention of the dye, %
142,630Starch3,00,699,699,9
235,730PVA4,00,699,699,9
326,330Starch3,0-98,5-
410,540-2,00,3-98,3
5the 11.640PVA2,50,298,399,9

A method of obtaining a pigment for making paper and paperboard, comprising a mixture of calcium hydroxide, aluminum sulfate and natural inorganic component in the dispersion in water, drying the resulting product, obtaining powder and its dispersion in water, characterized in that as a natural inorganic component used calcium carbonate, whereby it is prepared by stirring a mixture of calcium hydroxide with calcium carbonate at a ratio of these components respectively from 1.0:2.2 to 1.0 to:12,9, and then to the resulting dispersion mixture gradually add aluminum sulfate at a ratio of the latter to the total mass of calcium hydroxide and calcium carbonate 1.0:0,85-1,0:4,30, then the temperature of the mixture was raised to 80-85°and the reaction mixture is maintained under stirring for 90-180 min with the formation of the pigment dispersion with a content of dry substances of 20-35%, and the additional dispersion of the powder is carried out in water containing a water-soluble dye and/or a binder selected from the group consisting of starch and polyvinyl alcohol, and the concentration of dye is 0.2-0.6% of the dry weight of the pigment and binder 2,0-4,0% of the dry weight of the pigment.



 

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