SU450825A1 - Pigment Preparation Method - Google Patents

Description

The invention relates to the chemical industry, in particular to the production of pigments, and may find wide application in the process of preparing inks for various types of printing.

A method of producing organic pigments in the form of granules, concludes, is injecting a solution of a water-insoluble resin in an organic solvent into an aqueous suspension of pigment. The method allows to preserve the original dispersion.

The main disadvantage of this method is that the resulting form of organic pigment is obtained in the form of some large aggregates - granules. The preparation of paint compositions based on it includes the same stage of grinding the pigment granules in a binder as the usual pigment.

The purpose of the invention is to develop a method for obtaining a finely divided pigment in the form of a non-dusting powder, which makes it possible to obtain color formulations, a long and time-consuming stage of mechanical grinding of the binder in the binder.

For this, a solution of the pigment in concentrated acid is introduced into the resin solution in an organic solvent in the presence of surfactants, and the mixture is precipitated into a solvent that is miscible with the solvents of the resin and pigment, but at the same time is the precipitant for the latter.

Stearic acid, cetyl alcohol or their mixture, dodecylamine and octadodecylamine can be used as the surface of the active substance.

The obtained fine pigment has a high degree of dispersion, increased intensity and purity of the top and

is a low dust powder. The preparation of the ink based on the obtained pigment consists in the simple mixing of all the components that make up the ink on a high-speed mixer.

Example 1. 10 wt. including phenol-formaldehyde resin e-12 and 0.3 weight. including stearic acid is dissolved in 200 weight. including ethyl acetate. Then, with chilling, stirring

within 40 min. sulfuric acid solution of the blue phthalocyanium pigment obtained by dissolving 5 wt. including pigment in 70 wt. including concentrated sulfuric acid (d 1,96).

After the addition of the pigment solution is completed, the reaction mixture is stirred for 30 minutes. Water is added to the mixture with cooling and stirring. A solid blue precipitate falls out. Him

filtered, washed with water until neutral

reaction and dried at a temperature not higher than 60 ° C.

Example 2. 10 wt. including ethylcellulose n 0.3 weight. including dodecylamine dissolved in 200 wt. ethyl alcohol. With stirring, add a solution of yellow light-fast pigment obtained by dissolving 5 wt. including pigment in 100 weight. including glacial acetic acid. The mixture is then stirred for 30 minutes.

Water was added to the mixture while stirring. A solid yellow precipitate falls out. It is filtered, washed with water until neutral, and then dried at a temperature ne above 100 ° C.

Example 3. 10 wt. including calcium and calcium resin 0.3 wt. including cetyl alcohol is dissolved in 200 weight. including solvent mixtures (acetone + toluene + alcohol in a ratio of 1: 2: 10). Then, a solution of Ruby varnish lacquer (5 parts by weight in 200 parts by weight of acetone) was added while stirring.

After adding the pigment solution, the mixture is stirred for 30 minutes.

An aqueous solution of acetone in a ratio of 1: 1 is added to the mixture obtained by stirring. A solid red precipitate falls out. It is filtered, washed with water and dried at a temperature not higher than 60 ° C.

Example 4. 10 wt. including ethylcellulose brand LK, 0.05 weight. including stearic acid and 0.05 wt. including cetyl sirta dissolved in 200 weight. ethyl alcohol.

With stirring, add a solution of ruby varnish SC (5 parts by weight in 200 parts by weight of acetone). The mixture is then stirred for 30 minutes.

Water is added to the mixture while stirring. A solid red precipitate falls out. It is filtered, washed with water until neutral, and then dried.

at a temperature not higher than 100 ° C.

Example 5. 10 wt. including ethylcellulose brand LK and 0.1 weight. octadecylamias dissolved in 200 wt. ethyl alcohol. With stirring and cooling for

A sulfuric acid solution of the blue phthalociaiine blue pigment obtained by dissolving 5 wt. including pigment in 70 wt. including concentrated sulfuric acid. Upon completion of the addition of the nigment solution, the reaction mixture was stirred by enie for 30 minutes.

Water is added to the mixture with cooling and stirring. A solid blue precipitate falls out. It is filtered, washed with water until neutral, and dried at a temperature not higher than 1 ° C.

Subject invention

The method of producing pigment by mixing the pigment with the resin in the presence of a surfactant substance, characterized in that, in order to increase the degree of dispersion and intensity of the final form of the pigment, it is introduced in the form of a solution in concentrated acid in an amount of 1 weight. including dry pigment 0.1 to 2.0 weight. including resins and as a surface-active substance use a substance selected from the group containing cetyl alcohol, stearipic acid, dodecylamine and octadecylamine in the amount of 1-3% by weight of the dry pigment and solvent.