Casein varnishes on soluble glass. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Casein varnishes on soluble glass. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Lacquer casein formulations obtained by the interaction of casein with cresol. With this interaction, a resinous product is obtained, soluble in excess cresol. If 100 wt. including a solution of cresol-casein in excess of cresol, heat in an autoclave under a pressure of 3-5 atmospheres with 40-50 wt. h. 40% formalin, then a resin suitable for the preparation of varnishes is obtained. To this mixture, a small amount of potash can be added to the autoclave as a condensing agent. The above compositions can be obtained by one of the following methods:

Granular raw casein is doused with double the amount of raw cresol and after swelling, a small amount of cresol is added to the casein, after which the preparation is ready for use.

The crushed raw casein is doused with oleic acid and left to stand for 24 hours, then the liquid is drained (after cooling) and the raw casein is allowed to swell in cresol.

Finely powdered raw casein is thoroughly mixed with casein-cresol and formaldehyde and heated in an autoclave. Casein acts mainly as a contact condensing agent, on the other hand it also serves as a filler. By heating the autoclave, the pressure is raised to 3 atmospheres. The resulting product is soluble in alcohol and thus cresol-casein varnishes are obtained.

1st recipe:

250 g of crude casein is mixed with 500 g of cresol; after the casein swells and a homogeneous mass is obtained, the latter is treated with 400% formalin (40%) and heated in an autoclave to a pressure of 3 atmospheres. Heating is continued at this pressure for 10 minutes, then allowed to cool. The product obtained by dissolving in alcohol gives a varnish.

2st recipe:

250 g of finely divided casein are mixed with 1 g of cresol and 500 g of formalin. Then heated in an autoclave at a pressure of 500 atmospheres for 3 minutes. It turns out a mass that is easily soluble in alcohol.

The masses obtained by the first and second methods give varnishes that have a fast drying ability, high gloss, and disinfectant properties. Alcoholic solutions of these preparations, mixed with alcoholic solutions of celluloid, give an elastic and viscous varnish, which is used for the production of artificial leather.

Casein varnishes can also be prepared by mixing an alcohol solution of varnish resin with an ammoniacal casein solution. The varnish resulting from this gives a highly shiny beautiful cover. If ordinary commercial casein is used to make such a varnish, the compositions turn out to be cloudy.

This deficiency can be eliminated by long aging, filtering or the addition of clarifying agents. You can get rid of cloudy particles and get a completely clean transparent varnish if you cool it for some time at a temperature slightly below 0 ° C.

Author: Korolev V.A.

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