Method of producing composite pigment material for producing paint

FIELD: chemistry.

SUBSTANCE: described is a method of producing composite pigment material based on composite particles of a pigment of titanium dioxide and calcium carbonate in micro-marble form. The method involves separate preparation of aqueous dispersions of said components in a high-speed dissolver for 20 minutes, followed by mixing the two dispersions. Titanium dioxide is dispersed in the presence of a polymer dispersant based on an AB-block-copolymer, and the micro-marble is dispersed in the presence of sodium tripolyphosphate. The obtained mixture of the composite pigment material is ready for adding into paint.

EFFECT: simple technique of obtaining pigment material based on titanium dioxide while preserving its physical and chemical properties which correspond to standards, reduction of the amount of expensive titanium dioxide in paints.

1 tbl, 3 ex

 

The present invention relates to methods of producing pigmentary material for the preparation of paints and can find application in the paint industry.

Know the use of pigment titanium dioxide in the inks to ensure good hiding power and whiteness of the coating. To reduce the cost of structures using titanium dioxide, reduce its content in the paint due to the introduction of other special additives, for example, patent RF №2111223, C09D 127/08.

Known methods of coating particles of pigments to improve the physical properties of the dyes, for example, RF application No. 2006122222, SS 1/62, RF patent №2134705, SW 67/08.

From the publication WO 92/19685, 1992 a method of obtaining composite pigment material based on titanium dioxide and calcined kaolin pigment (U.S. patent US 5152835), which involves the separate preparation of the dispersion of these pigments in the presence of one or more dispersing agents, for example, based on sodium or ammonium salts of polyacrylic or methacrylic acid, or mixtures thereof, salts of phosphoric acid and their mixture using the conditions of mixing dispersions for achieving thin-dispersed composite pigment with high solids content and, therefore, its high ukryvistost is. However, this method assumes the maintenance of a high pH environment (above 9), which will limit the choice of pigments in subsequent pigmenting paint material, because it will be possible to use only alkali-resistant pigments. In addition, concentrated kaolin pigment expensive and less common in comparison with calcium carbonate, the use of which is provided in our proposed method.

A known method of obtaining a pigment material for the preparation of the dyes according to the patent of Russian Federation №2134705, selected as a prototype, aims to reduce flocculation (flocculation) of the pigment particles and includes separate preparation of an aqueous dispersion of the pigment material, in particular titanium dioxide, and the second component, chemically distinct material, in particular from among carbonates, and pH of the prepared dispersions are the same and one of the dispersions receive in the absence of dispersant, the resulting dispersion is mixed. To save a received composite pigment material is conducted additionally filter operations suspension of two aqueous dispersions, washing, drying, crushing. The interaction between the particles of the obtained composite material is due to electrostatic forces of attraction.

The disadvantages of the known method is necessary to relate the complexity of the technological process, that significantly reduces the attainable savings by reducing the number of expensive pigments, the most common of which is titanium dioxide.

The technical result of our proposed method consists in a significant simplification of the production technology of pigment material based on titanium dioxide, with preservation of physico-chemical parameters, relevant standards, which ultimately leads to reduction in the number of expensive titanium dioxide in the paint.

The technical result is achieved by the fact that the operation of the known method of obtaining a composite pigment material on the basis of the pigment is titanium dioxide rutile modification and calcium carbonate in the form of mikromramor, including separate preparation of aqueous dispersions of these components and the mixing of the two dispersions, according to the proposed solution are as follows. Aqueous dispersions prepared in high-speed dissolver for 20 minutes with the linear speed of the cutter 20-25 m/s, and the dispersion of titanium dioxide are in the presence of the polymeric dispersant of Orotan 731 To on the basis of AB-blockcopolymer 2-vinylpyridine) - derivatives and methyl ester of methacrylic acid, the estimated degree of polymerization on vinylpyridine is n=27, methyl ether, methacrylic acid m=122, and mi is raramuri - in the presence of sodium tripolyphosphate, then the dispersion is mixed. The resulting composition is ready to enter into the paint.

The essence of the proposed method, based on the steric effect of particle interactions is to use a reversible phenomenon controlled flocculation.

When mixing separately prepared dispersion of titanium dioxide and mikromramor particles mikromramor disaggregated to the original size and stable sodium tripolyphosphate, interact with a polymeric dispersant, which was stabilized titanium dioxide. Both of pigment surrounded by molecules of the polymer dispersant so that pigmentation group focused on the pigment, and groups capable of adverse interactions, form the side valence bond connecting particles mikromramor and titanium dioxide together. Mainly is the formation of such ties between particles of different pigments, communication between particles of the same species occur much less frequently due to the different mass of mikromramor and titanium dioxide. Thus, we get a complex consisting of larger particles mikromramor surrounded by particles of titanium dioxide, which leads to reduction of titanium dioxide in the pigment composition of the material. In this case, thanks to the presence in the paint from siteline large particles with a high refractive index, which is caused by the refractive index of titanium dioxide, the hiding power of the paint remains high.

Use as a dispersing agent for mikromramor of sodium tripolyphosphate, which is a good complexing with cations of CA2+provides a high degree of interaction between the dispersant with the surface of the particles mikromramor.

Use as a dispersant for titanium dioxide AV blockcopolymer 2-vinylpyridine) - derivatives and methyl ester of methacrylic acid having at the ends of the molecule facing in a dispersed environment group, capable of forming side valence bonds, will bind the particles of mikromramor and titanium dioxide among themselves.

Considerable simplification of the proposed technology is achieved by the presence of all three operations for preparation of the pigment material, there is no need to strictly control the pH of the medium and not required to wash the pigments from alkaline or acidic solution. In this method assumes two ways of stabilizing pigment: steric and electrostatic mechanism that will provide an even higher stability of the system in comparison with the methods of stabilization provided for in the patents of the Russian Federation No. 2134705 and US 5152835.

The proposed technology is represented by the following examples.

Example 1

<> In dissolvere-mixer to 76 g of water are added to 1 g of Microbiocide, active ingredients which are classified according to the IUPAC nomenclature as 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one and 1 g of sodium tripolyphosphate, added 0.3 g of antifoam, representing a mixture of synthetic oils and modified esters of fatty acids with 100%concentration of active components, and input 50,8 g mikromramor with a dispersion of particles of 1-5 μm, the dispersion of conduct when the linear velocity of the cutter 20-25 m/s in for 20 minutes, enter nonionic polyurethane thickener with associative mechanism of action in the amount of 10 g, 2.3 g of coalescent - complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g of a foaming agent which is an aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid. The degree of milling measured by grindometer "Wedge".

At the same time in the other dissolver pour 151 g of water added to 6.1 g of the dispersant of Orotan 731 To on the basis of AB-copolymers of 2-vinylpyridine) - derivatives and methyl ester of methacrylic acid, the estimated degree of polymerization on vinylpyridine is n=27, methyl ether, methacrylic acid m=122, input 0.3 g of antifoam, based on synthetic oils and esters of modified fatty acids and added to 152.5 g dioxi is and titanium rutile modifications dispergerem for 20 minutes at a linear speed cutters 20-25 m/s Input nonionic polyurethane thickener in an amount of 10 g, 2.3 g of coalescent - complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g of foaming agent - aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid. The degree of milling measured by grindometer "Wedge".

Prepared dispersion joined together in the same dissolvere and under stirring with a linear speed cutters 8-10 m/s input of the remaining components: 14.8 g of nonionic polyurethane thickener, 6,9 g complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 313,3 g aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid and 1.4 g of antifoam, based on synthetic oils and esters of modified fatty acids.

Example 2

In dissolvere-mixer to 100 g of water is added 1 g of Microbiocide on the basis of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one and 1.5 g of sodium tripolyphosphate, enter 0.3 g of antifoam, based on synthetic oils and esters of modified fatty acids and and 67.8 g of calcium carbonate in the form of mikromramor, dispersion conduct when the linear velocity of the cutter 20-25 m/s for 20 minutes, enter nonionic polyurethane thickener in an amount of 10 g, 2.3 g of coalescent complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g aqueous dispersion of a copolymer of butyl acrylate methyl methacrylate and methacrylic acid. The degree of milling measured by grindometer "Wedge".

At the same time in the other dissolver pour to 127.2 g of water added to 5.4 g of the dispersant of Orotan 731 To on the basis of AB-blockcopolymer 2-vinylpyridine) - derivatives and methyl ester of methacrylic acid, 0.3 g of antifoam, based on synthetic oils and esters of modified fatty acids and entered 135,5 g of titanium dioxide rutile modifications dispergerem for 20 minutes at a linear speed cutters 20-25 m/s Input nonionic polyurethane thickener in an amount of 10 g, 2.3 g of coalescent: complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g of foaming agent: aqueous dispersion of a copolymer of butyl acrylate methyl methacrylate and methacrylic the acid. The degree of milling measured by grindometer "Wedge".

Prepared dispersion joined together in the same dissolvere and under stirring with a linear speed cutters 8-10 m/s input of the remaining components: 14.8 g neinogennye polyurethane thickener, 6,9 g complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate; 313,3 g aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid brand and 1.4 g of antifoam, based on synthetic oils and esters of modified fatty acids.

Example 3

In dissolvere-mixer to 120 g of water are added to 1 g of Microbiocide on the basis of 5-chloro-2-methyl-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one and 2 g of sodium tripolyphosphate, add 0.3 g of antifoam, based on synthetic oils and esters of modified fatty acids and type of 91.6 g of calcium carbonate in the form of mikromramor, dispersion conduct when the linear velocity of the cutter 20-25 m/s for 20 minutes, enter nonionic polyurethane thickener in an amount of 10 g, 2.3 g of coalescent: complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g of foaming agent - aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid. The degree of milling measured by grindometer "Wedge".

At the same time in the other dissolver pour to 107.6 g of water, are added 4.5 g of the dispersant of Orotan 731 To with on the basis of AB-copolymers of 2-vinylpyridine) - derivatives and methyl ester of methacrylic acid, 0.3 g of antifoam, based on synthetic oils and esters of modified fatty acids and entered 111,7 g of titanium dioxide rutile modifications dispergerem for 20 minutes at a linear speed cutters 20-25 m/s Input nonionic polyurethane thickener by weight of 10 g, 2.3 g of complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate and 100 g of foaming agent: aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid. The degree of milling measured by grindometer "Wedge".

Prepared dispersion joined together in the same dissolvere, mix p and the linear velocity of the cutter 8-10 m/s and enter the remaining components: 14.8 g of nonionic polyurethane thickener; 6,9 g complex atherosperma 2,2,4-trimethyl-1,3-pentandiol-monoisobutyrate; 313,3 g aqueous dispersion of a copolymer of butyl acrylate, methyl methacrylate and methacrylic acid and 1.4 g of antifoam, based on synthetic oils and esters of modified fatty acids.

The inks prepared in the examples and indicators of coverage in comparison with standard enamel reflected in the table.

№ p/pName of the component%
Standard enamelExample 1Example 2Example 3
1Water22,6222,722,7222,76
Biocide: a mixture of 5-chloro-
22-methyl-4-isothiazolin-3-he0,10,10,1 0,1
2-methyl-4-isothiazolin-3-one
3Sodium tripolyphosphate-0,10,150,2
4Sodium salt0,82---
polycarboxylic acid
Polymer dispersant
Orotan 731 To on the basis of AB-copolymers
52 - vinylpyridine) - derivatives and- 0,610,540,45
methyl ester
methacrylic acid
Antifoam based on synthetic oils and
6esters modified0,20,20,20.2
fatty acids
7Titanium dioxide
20,3315,2513,5511,17
Calcium carbonate
8(mikromramor)-5,08of 6.789,16
(particle size 1-5 microns)
9Nonionic3,483,483,483,48
polyurethane thickener
Complex epireport 2,2,4-trimethyl-
10 1,3-pentandiol-1,151,151,151,15
monoisobutyrate
Aqueous dispersion
11copolymer of butyl acrylate,51,3351,3351,3351,33
of methyl methacrylate and methacrylic acid
The hiding power of paint, g/m2
12Opacity according to GOST 8784-759898101105

A method of obtaining a composite pigment of materialin the basis of the composite pigment particles of titanium dioxide and calcium carbonate in the form of mikromramor, including separate preparation of aqueous dispersions of these components and the subsequent mixing of the two dispersions, characterized in that the aqueous dispersion prepared in high-speed dissolver for 20 min, and the dispersion of titanium dioxide are in the presence of polymeric dispersant based on the AB-block copolymer, and mikromramor - in the presence of sodium tripolyphosphate.



 

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