SU41614A1 - A method of manufacturing a coating layer for mirrors - Google Patents

Description

The present invention relates to a method of manufacturing a coating layer for mirrors.

A layer of silver applied to glass is usually covered with a protective paint layer, which should protect it from damage and mechanical damage, both when using a finished mirror and during machining (grinding).

Until now, a layer of paint consisting of lead red lead, varnish and solvent of a scooper or the like, on which a second layer of the same paint or tincture chalk was applied, was commonly used. However, the aforementioned coatings, in addition to the scarcity of the materials included in their composition, are not sufficiently resistant to mechanical and chemical effects, especially during wet processing and grinding, as well as to the prolonged effect of dampness. In the meantime, the technical requirements imposed on the surface paint for mirrors are very high. It should be easily applied with a brush, should not crack after peeling, peel off, etc., or lag behind silver altogether, should be I (L9)

It is resistant to sand when sanding, must dry quickly after being in water and be generally waterproof. Its surface layer should be smooth, but not very slippery and not at all sticky so that the mirrors, when folded together, do not stick together.

The inventor of the present invention proposes a method for producing a coating-paint layer for mirrors, which fully satisfies all of the above conditions.

The method consists in that asphalt lacquer, which is a solution of asphalt or tar in gasoline or turpentine with an insignificant content of choleta (0.04%) and sulfur (0.36-7), is added powdered caustic magnesite and diluted to an emulsion with water, cerolite, which is known to be a compound of aluminum and calcium oleic acid salts, calcium sulfate and calcium oxide hydrate. The cerolite with magnesite, added to the asphalt lacquer and mixed well with it, gives a stable emulsion, which is then added to Portland-cement 43 hours per 100 hours of asphalt varnish. When cement is introduced into the mixture, the latter absorbs water and sets in, thereby causing a slow hardening of the entire mixture. To accelerate drying, a small amount of drying oil is added to the mixture.

To apply the color-coating layer to the silver-plated surface of the glass, the latter is first coated with a thin protective collodie film, which, after it is dried, is applied with a brush to a freshly prepared mixture of asphalt varnish with cerolite, magnesite, cement and drying oil. In such a thin layer deposited on a smooth surface, besides cement embracing and volatilization of the solvent (turpentine), absorption of oxygen by the olyphos and hardening of the mixture of cerolite with magnesite also occurs.

As a result, a very durable waterproof layer is obtained that fully meets the requirements listed above, and it takes almost twice less time to dry than with commonly used formulations.

The subject matter of the invention.

A method of manufacturing a coating-color layer for mirrors, characterized in that portland-cement and a small amount are added to a mixture of asphalt varnish with an aqueous emulsion of calcium oleic acid, oleic acid aluminum, calcium sulfate and calcium oxide hydrate to which caustic magnesite is added. olif