SU51660A1 - The method of preparation for fixing casein coating colors on the skin - Google Patents

Description

Casein and nitrocellulose inks are used as skin coating inks.

Both those and others have their advantages and disadvantages.

1.Kazeinovye paints give a more elastic film. Properly applied casein paint produces a thin, delicate film that does not completely change the specific skin type.

2.Kazeinovye paint much cheaper nitrocellulose.

3. The ventilating properties of casein-colored shoes are significantly higher than those of nitrocellulose-coated shoes.

4.Kasein paints are harmless to workers and are fire safe.

The only, but very large, disadvantage of casein paints, as compared with nitrocellulose, is the insufficient water resistance of casein paints.

This defect of casein paints, widely used by the leather industry, necessitated the development of a method for fixing casein paints in order to increase their water resistance and resistance to dry friction.

The preparation according to the present invention for fixing casein coating paints on the skin is a composition of a mixture of a water-alkaline dispersion of aluminum resins with casein and alizarin oil with the addition of formalin. The production of a fixative is made up of the following operations: 1) preparation of aluminum resilient, 2) dissolution of aluminum resilient, 3) preparation of casein solution, 4) mixing solutions of aluminum resins and casein with alizarin oil, 5) dilution with water.

The preparation of aluminum rubber is made as follows: 100 parts of rosin are melted, and 20% / o of caustic soda solution in an amount of 66 parts (by volume) is introduced into the molten rosin with constant stirring. This produces a thick, uniform mass of greenish. The sample on the glass after cooling should not be brittle, but should be easily smeared on the glass.

After that, 200 parts of water are introduced, the mass is heated and stirred until homogeneous.

and acquiring a greenish color. Then another 300 parts of water are added; at the same time, the mass takes on a whitish-yellow color. Then the remaining amount of caustic soda is introduced, i.e. 14 parts by volume, the mass is thoroughly mixed, it becomes transparent and takes on a yellowish-green (straw) color.

The resulting alkaline solution of rosin soap is diluted with water in a ratio of 1: 1, and aluminum rubberate is precipitated from the solution diluted in this way by gradually introducing a 25% alumina sulphate solution when placed until complete precipitation. When the first portions of alumina are introduced, the mass strongly ceases, with further input of the alumina sulphate solution, the foam begins to disappear, and the mass thickens. After some time, when the mass becomes thinner, a sample is taken for complete precipitation (by introducing a solution of alumina sulphate into a clear filtrate) and, in a positive case, start washing the resulting white precipitate.

It is usually washed 5-6 times, then the washed precipitate is pressed, dried and ground.

Two parts of the obtained aluminum rubber are poured into 40 parts of a 1% caustic soda solution and the rubberate is dissolved during heating. Dissolution should be complete, without residue.

Preparation of a casein solution is made according to the following exemplary recipe: 100 parts of dry ground casein are poured over 300 parts of warm water with a temperature of 40-50 ° and stirred for 20-25 minutes (casein swells), then a 20% caustic solution is injected soda in the amount of 20 parts, stirred for 20-25 minutes and introduced more

55 parts of water. All this is agitated until casein is completely dissolved. After this, a 20% strength solution of phenol is introduced in an amount of 25 parts. For the preparation of the fixative, 42 parts of a solution of aluminum res-inate, 30 parts of a casein solution, 2 parts of neutral or weakly alkaline alizarin oil, and 26 parts of water are mixed.

The obtained fixer can be stored in wooden barrels and bottles.

 Before use, the fixative is mixed with diluted formalin in a 1: 1 ratio, i.e. one part of diluted formalin is one part of water. Formalin is introduced into the fixative gradually with stirring, and commercial (40%) formalin diluted with 7 parts of water is used.

The fixative working solution is recommended to be prepared in the amount necessary for one-day consumption. The finished working solution of the fixative is applied with a thin even layer to the shoes painted with casein paint, a soft brush or sponge. A brush or sponge should be driven in the same direction, avoiding multiple visits to the same place. Shoes with a good, not stuffy face of the skin can be twice blocked with a fixative.

The subject matter of the invention.

The method of preparation of the preparation for fixing casein coating paints on the skin, characterized in that the solutions of casein and alizarin oil are mixed with an aqueous alkaline dispersion of aluminum rubber and formalin is added to the resulting mixture.