SU1006461A1 - Method for treating iron blue - Google Patents

Abstract

1. METHOD FOR TREATING THE IRON LASUR, including introducing its amine-containing solution into suspension, subsequent filtering of the suspension, washing and cytuKy of the obtained precipitate, characterized in that, in order to improve the pigment properties of the target product, an aqueous solution of salt is taken as the amine solution, an aliphatic solution of aluminate is used, and an aliphatic solution of an aqueous solution is taken. alkyl phosphate based on primary or secondary fatty alcohols and injected into the pre-oxidized iron-blue suspension. 2. The method according to p. 1, from. It is characteristic that the salt of aliphatic amine and alkyl phosphate is taken in an amount of 0.01-0.30% by weight of dry iron-blue at pH 2.0-3.5. .

Description

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oit The invention relates to the technology for the production of iron blue used in the paint industry. A known method for producing iron blue, including the interaction of an iron-synergistic salt of alkali metal or ammonium with a solution of sulfuric acid iron (II), heat treatment of the resulting suspension of ferrocyanide, its oxidation with ammonium sulfate, filtering and drying the oxidation product fl. The disadvantage of this method is the poor dispersibility of the half hue of pigment in the binder and its relatively low coloring ability. The closest to the technical essence of the present invention is a method of treating iron azure by adding aliphatic amines in an amount of 0.5-15% by weight of the iron azure suspension to the suspension, followed by filtering the suspension, washing and drying the precipitate. The pigment obtained by this method has the following characteristics: dye capacity — 101%, dispersion degree — 40 µm, RF aqueous extract — 5.0, content soluble in will — 1.1% 2. The disadvantages of this method are low values pigment quality by color, degree of dispersion and content of substances soluble in water, as well as high consumption of modifier. The aim of the invention is to improve the pigment properties of iron blue. This goal is achieved in that according to the method of treating iron blue by introducing into the pre-oxidized suspension of iron blue an aqueous solution of an aliphatic amine salt and alkyl phosphate based on primary or secondary alcohols in an amount of 0.01-0.3% by weight of dry iron azure at pH 2.0-3.5, as the amine solution, take an aqueous solution of aliphatic aivMHa and alkyl phosphate based on primary or secondary alcohols in the above amount. In addition, the processing of iron blue is carried out at a pH of 2.0-3.5. According to this method, a pigment with a high color of 123-135% is obtained, the content of water soluble substances is 0.7-0.8 and the dispersion degree is 25-30 microns, improved compared to the known pigment; for a known pigment, this indicator is 40 microns . As a result of introducing an aqueous solution of alkylphosphate into the oxidized suspension of iron blue at 0-3.5, acid hydrolysis occurs with the formation of the alkyl phosphate anion and the triethanolamine cation or another aliphatic amine cation, which fully interact with the surface of the iron blue to displace adsorbed inorganic ions. With a pH of more than 3.5, the rate and degree of hydrolysis of the alkyl phosphate salt decreases, with increasing acidity of the medium, and water consumption for washing the pigment increases to pH less than 2.0. With the introduction of a modifier of less than 0.01%, there is insufficient organophilization of the surface of iron blue and the effect of quality improvement is negligible. The introduction of the modifier over 0.3% is impractical, since there is no further improvement in the quality of iron blue. As a water-soluble salt of alkyl phosphate is used, the salt of triethanolamine or aliphatic amine and alkyl phosphate based on primary fatty alcohols of the C-C-C fraction. secondary fatty alcohols fraction So-Sgo Example. 0.015 g (0.01% by weight of dry iron blue) of triethanolamine alkyl phosphate based on secondary fatty alcohols of fraction Q, ...- is added in 0.5 of water and stirred until complete dissolution. Into an iron-blue synthesis reactor containing 2.5 liters of the oxidized suspension with a concentration of 60 g / l, 0.5 liters of the prepared solution of triethanolamine alkyl phosphate is introduced. The reaction mixture is stirred for 1 h at 85 s and the pH of the suspension is 2.0. The treated suspension is filtered, washed with water in the amount of Zli the precipitate obtained is dried. The resulting pigment has the following characteristics: color 123%, degree of dispersion 30 µm, pH of the aqueous extract 6.3, content of water-soluble substances 0.8%. PRI mme R 2. 0.45 g (0.3% by weight of dry iron-blue) salts of aliphatic amine and alkyl phosphate based on primary fatty alcohols of the C-J-QII fraction are mixed with 1.5 liters of water until completely dissolved. In a 2.5 l of an oxidized suspension of iron blue with a concentration of 60 g / l, 1.5 l of a prepared solution of the salt of aliphatic amine and alkyl phosphate is introduced. The reaction mixture is stirred for 2 hours at and the pH of the suspension is 3.5. The treated suspension is filtered, washed and dried as in example 1.

The obtained pigment has the following parameters: dye capacity 135%, degree of dispersion 25 µm, pH of the aqueous extract 6.7, content of water-soluble substances 0.7%.

Comparative physico-chemical characteristics of the samples of iron blue, obtained according to this invention and the method of the prototype shown in the table.

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As is known, the technical and economic advantages of the invention are determined by the improved coloring ability and degree of dispersion of the iron manhole, as well as by the reduction of the consumption of modi

1.1

101 fixers, which makes the proposed FII method promising for the production of iron-blue used in paint spill.

Claims (2)

1. METHOD FOR PROCESSING IRON LAZUR, including introducing an amine-containing solution into the suspension, subsequent filtration of the suspension, washing and drying the obtained precipitate, characterized in that, in order to improve the pigment properties of the target product, an aqueous solution of salt, an aliphatic, is taken as the amino-containing solution. amine and alkyl phosphate based on primary or secondary fatty alcohols and injected into a pre-oxidized suspension of iron blue. 2. The method according to π. 1, so on and the fact that the salt of an aliphatic amine and alkyl phosphate is taken in an amount of 0.01-0.30% by weight of dry iron blue at a pH of 2.0-3.5.