SU59382A1 - The method of obtaining artificial silk and films - Google Patents

Description

Rayon made from viscose, hydroxyethyl cellulose, etc., swells strongly in water and due to this, its original strength decreases by a factor of 2-3.

According to the present invention, in order to increase the strength of silk and films, it is proposed to produce artificial silk and films by coagulating alkaline solutions of cellulose hydroxyethyl cellulose hydroxyethyl xanthate containing silicic acid in the form of soluble glass or sodium metasilicate. The process is based on the fact that solutions of hydroxyethylcellulose and cellulose oxyethylxanthate are mixed in any relationship with liquid glass or sodium metasilicate, and the latter coagulate well in the conditions of artificial silk. In the process of drying at 102-105 ° C, silicic acid is converted into silicon dioxide, and the latter does not swell the water, and thus gives water resistance to the finished product.

With this method of making silk and films, the consumption of cellulose is reduced. The resulting films containing 10–50% silicic acid are transparent and are not inferior in quality to films from pure cellulose solutions. Films are well plasticized with glycerin and other plasticizers.

The preparation of the mixed solutions is carried out as follows. A solution of cellulose ether is prepared with a 10% concentration of cellulose in a 6-7% solution of sodium hydroxide and then diluted relatively slowly with a solution of water glass to a 7% concentration of cellulose in solution. Dilution with sodium metasilicate solution can be done quickly. After that, the solution is well mixed. With the addition of liquid glass in a relatively large amount, the viscosity of the solution increases markedly, and the stability of the latter decreases. The addition of sodium metasilicate solution in large quantities has almost no effect on the change in solution.

Filtration of the solution, spinning 1., and film forming is carried out in the usual order, according to the existing technological process.

Silk washing should be carried out with weak ammonia water to avoid leaching of silicic acid. The residual silk in the ammonia is removed by drying. The obtained silk and films from such solutions before drying in a physical sense are a mixture of cellulose with silicic acid.

It should be expected that in this case there is an extremely close mixture of cellulose with silicic acid, since, according to preliminary fluoroscopic data, there was a decrease in cellulose micelles in preparations (film) containing silicic acid.

The subject matter of the invention.

The method of obtaining the Artificial Silk and Oxyethylcellulose and Cellulose Oxyethylxanthate films. This is because, in order to increase the water resistance of the final product, liquid glass or sodium metasilicate is added to the solution of the corresponding cellulose derivative in alkali and the solution is subjected to the usual treatment.