SU1502588A1 - Method of producing pigment-fillers - Google Patents

Abstract

This invention relates to a process for the production of pigment-based fillers based on dispersed minerals used to make oil paints, enamels, painted primers and water-emulsion compositions, as plastic fillers. The goal is to simplify the process of obtaining pigment-filler and reduce its toxicity and fire and explosion hazards by eliminating organic solvents from the process. For this, a method is proposed for preparing pigment-fillers by treating dispersed mineral-carbonate-containing clay with an aqueous solution of a hydrolyzing transition metal salt of iron (III) or copper (II), taken in the amount necessary to fully neutralize the carbonate component, followed by washing the suspension and drying draft. At the same time, in order to increase alkali resistance and color gamma expansion, the dry sediment obtained as a result of treating carbonate-containing clay with a solution of iron salt (III) is additionally subjected to heat treatment at 400-900 ° C. In order to expand the color range, the precipitate is further treated with an aqueous solution of an alkali metal ferrocyanide in the presence of hydrochloric or sulfuric acid. For example, carbonate clay treated with an aqueous solution of CUCL ₂ ^. 2H ₂ O, allows to obtain a pigment bluish-gray or steel color, resistant to alkali. The pigment may have a color such as blue, green brown, light brown, purple and other shades of green, blue and brown. The pigment is resistant to alkalis, with the exception of pigments obtained as a result of the introduction of ferrocyanides into the process. The pH of the aqueous extract of the pigment-filler is 5.3-6.6, the hiding power is 31-36.45 g / m ² . 3 hp f-ly, 4 tab.

Description

The invention relates to a process for the production of pigment-based fillers based on dispersed minerals, used for the manufacture of oil paints, enamels, painted primers and water-emulsion compositions, as plastic fillers.

The purpose of the invention is to simplify the process of obtaining a pigment-filler and at the same time reduce toxicity and fire and explosion hazard by eliminating organic solvents.

The essence of the invention is that carbonate-containing clay

(KG) is treated with aqueous solutions of hydrolyzing metal salts, such as copper or iron, when heated, while taking the salts in an amount necessary to completely neutralize the carbonate component of the clay.

CG is a clay with a high adsorption capacity for salts of copper (11) and iron.

(Iii)

The chemical composition of clay is given in table. one .

The process of destruction of CG is caused by the acidic environment of aqueous solutions of transition metal salts due to their gyrolysis.

All pigment operations are carried out in an aqueous medium, which excludes the use of flammable, toxic organic solvents.

During heat treatment at 400–600 ° C, hydrate forms of iron (III) decompose with the formation of colored oxides.

Under the action of ferrocyanide ions on iron- or copper-containing samples in a weakly acidic medium, light-resistant pigment-fillers with a wide color gamut are formed. Pigmentation is due to the formation of fixed on the surface of painted ferrocyanides of iron (III) or copper (II), and the color of the pigment filler is a combination of the colors of the original modified dispersed mineral and the formed ferrocyanides.

Example 1. To 500 ml of an aqueous suspension of carbonate-containing bentonite clay containing 100 g of dry mineral, 500 ml of 4% is slowly added with stirring.

0

0

five

aqueous solution of CuCl, 2H2p. The mixture is heated to 40-50 seconds and maintained at this temperature until the gas is completely set. The precipitate is washed by decantation twice and centrifuged. A light-resistant inorganic pigment-filler of a bluish-gray (steel) color is resistant to alkalis and organic solvents, which is directly used for the preparation of water-emulsion compositions. Composition of used clay, May.%:

5 Si GI 30.36; AUGj 15.93;

2.07; FeO 3.73; TiO 0.67; Ca05.70; MgO 3.58-, 3.10; 1, 1 I;

0

five

0

five

SOj 0.99; S 0.16, organic matter 0.93, other impurities 12.29.

Examples 2-4. The precipitate obtained after centrifugation as described in example 1 is suspended in 200 ml of water and treated as follows: 5% potassium ferrocyanide solution is added. Then, with a vigorous stirring, a calculated amount of 0.1 M (0.35%) of a saline or 0.1N solution is slowly poured into the suspension. (0.5%) sulfuric acid.

The amounts of the added reagents and the color of the pigment obtained are mixed in the table. 2

Example 5. To 500 ml of an aqueous suspension of bentonite clay containing 100 g of dry mineral, 500 ml of a 5% aqueous solution of FeClj-6H, 0 are slowly added with stirring. The mixture is left until cessation of gas evolution. The precipitate is washed by decantation twice and centrifuged.

A light-brown, light-resistant, inorganic pigment-filler, resistant to alkalis and organic solvents, is obtained, which is directly used for the preparation of water-emulsion compositions.

Dried pigment is used for heavy oil paints, primers, and putties.

Example 6. The dry product / obtained according to example 5, is subjected to heat treatment at 400 or 600 C. Obtain pigments, respectively, brown n orange-red color.

Examples 7-10. The precipitate obtained after centranfugirova Ii

Example 1, suspended in 200 ml of water, added 5% solution of potassium ferrocyanide in an amount necessary to obtain a pigment-filler of a given color (Table 2) Then the calculated amount of 0.1 M is added to the suspension with vigorous stirring ( 0.35%) solution of hydrochloric or 0.05 M (0.5%) sulfuric acid. To obtain a uniform pigment-colored pigment, the acidity of the suspension is maintained at 4-5 pH.

The color of the resulting pigments is described in table. 3

The resulting pigment-fillers are inorganic and have light resistance similar to the known inorganic pigments: yellow iron oxide pigment, iron minium, iron azure.

After grinding the pigment-fillers in a bead mill, a milling degree of less than 45 units is achieved (according to the wedge method), which makes it possible to use the obtained pigment-fillers for preparing high-quality enamels, paints, and also as color fillers for plastics.

The properties of the pigments obtained in examples 1-10 are shown in table 4.

The use of the invention allows to reduce the staging and reduce the laboriousness of the process of obtaining pigment-fillers, improve working conditions and improve the safety technique by eliminating the use of toxic substances and flammable organic solvents and thereby obtain cheap, light-resistant pigments-fillers with

6

color range.

including mustache

five

0

50

0

five

Claims (4)

1. A method of producing pigment-fillers, including treating a dispersed mineral with an aqueous solution of a hydrolyzing transition metal salt when heated, washing the suspension and drying the pigment precipitate, which, in order to simplify the process and reduce toxicity and fire and explosion hazard, by eliminating organic solvents from the process; carbonate-containing clay is used as the starting material of the dispersed material and treated with its metal salt in an amount necessary to fully neutralize the onatnoy moiety. 2. The method according to claim 1, characterized by the fact that the hydrolysis of iron (III) or copper (II) salt is used. 3. Method POPP.1 and 2, characterized in that, in order to increase alkali resistance and to obtain a brown and orange-red pigment, the dry sediment obtained by treating the carbonate-containing clay with a solution of iron (III) salt is further subjected to heat treated at 400-600 C. 4. Method according to paragraphs. 1 and 2, in order to expand the color gamut, the pigment precipitate is additionally treated with an aqueous solution of an alkali metal ferrocyanide in the presence of hydrochloric or sulfuric acid. Table 1 Based on oxides. table 2 .Table 3 Table 4