SU40566A1 - Method of making colored films from cellulose ethers and resins - Google Patents

Description

For a number of scientific and practical problems, it is important to have a transparent material in the form of thin films painted in one or another color. These include: alarms, light effects, goggles, as well as purely scientific purposes, such as receiving light filters.

Such colored fillers, for example, from nitrocellulose, are easily obtained by adding some dyes to the solution used to form the film.

However, this comes up against difficulties, especially when obtaining the strongest and most durable acetyl-cellulose films, which means that only a few dyes are soluble in liquids that serve to produce a film (in varnishes), and those that are soluble in lacquers or, to a lesser extent, they fade in the light, i.e., they change their absorption spectrum, which makes them completely unsuitable in cases that require the complete constancy of this spectrum.

These difficulties are eliminated if, instead of complex organic substances, to use colloid-sprayed metals introduced into the film as their solution in organic liquids,

It has long been known that colloidal solutions of some metals in the most insignificant concentrations (0.01-0.001%) differ in bright and varied stains. These are; gold, silver, etc. It is also known that

(147)

by passing direct current between electrodes immersed in pure water (Bredig -1898) or high-frequency currents, in organic solvents (Svedberg) one can obtain such well-stable colored solutions of metals (sols).

The proposed method for coloring films of cellulose derivatives and natural and artificial resins is that a high-frequency current with a power of 0.1 to 3.0 amperes is passed between the corresponding metal electrodes immersed in acetone, water, or any other solvent, and there is a metal sputtering.

The resulting solution of the desired shade i concentration serves for the preparation of varnish in which acetyl cellulose or other film-forming substance is dissolved in the required amount, any other film components are introduced, like plasticizers 1g diluents, and a film is obtained from the solution using conventional methods, retaining , |; a long time coloring evils.

Solutions of cellulose ether colored with colloidal metal are quite stable, since cellulose ether acts on the metal particles as a protective collon. The color of the film is completely unchanged, since the metal particles do not undergo any chemical changes in the film, cannot be / cannot, and changes in the degree of their dispersion

difficult by the great viscosity of the menkey substance.

The high-frequency current needed for spraying can best be obtained by using a generator cathode lamp, which is driven by current from rectifiers through kenotrons from transformers, which in turn are powered by a city alternating current of 110 k1I 220 volts.

The method of dyeing can be changed so that the discharge is not carried out in the medium injected in the solvent, but in a weak solution of the emulsion in the solvent or even in the finished unpainted varnish.

i McaiHHMM method can be obtained 1 "etv8Y" film, painted with gold.

red films, painted mudflow, i p d

others.

The subject matter of the invention

Claims (2)

1. A method for producing colored films from cellulose ethers and resins, characterized in that organic films are used to make films that are colored by colloidally sprayed metals by spraying electrodes from the corresponding metals immersed in a solvent by passing a high frequency current between them. 2. A method according to claim 1, wherein the passing of a high frequency current occurs in a solution of cellulose ether OR the resin in this is dissolved.