SU95342A1 - Method of improving elasticity, softness and frost resistance of thin gas and waterproof materials made of polyamide resins - Google Patents

Description

Polyamide films, sheets and molded products and processing, in order to improve their mechanical properties, formalinol in the presence of acids. Such treatment increases the elasticity, softness and frost resistance of the material.

The treatment of thin flakes by the method encounters considerable technical difficulties, as the film softens and when pulled through a bath with a solution, it is easily torn.

It was found that if the film was glued onto an acid-resistant fabric or the fabric was watered with a solution of polyamide, then such a bilayer material could be treated with a concentrated solution of formaldehyde in the presence of acid at a pH below 3 without any special precautions.

The material treated in this way is highly elastic and soft and has a high anamor 03 oy.

The starting material for the production of films is mixed polyamates, soluble in alcohols and their mixtures with water, mixtures of alcohols and hydrogen halides, and in pyridine.

Mixed polyamides can be prepared from a diamine salt and a dicarboxylic acid, on the one hand, and from an aminocarboxylic acid or its amide-forming, and their derivatives, on the other. Ppme1P1my also mixed polyamides of several diamine dicarboxylic acids.

The basis on which the films are pasted is thin knitted fabric, woven glass of glass, fiber or perchlorovinyl, as well as polyamide fiberglass. In the latter case, it is preferable to use polyamides which are insoluble in conventional solvents for polyamides.

Processing is carried out - formaldehyde solution with a content of 20 percent or more of formaldehyde.

The temperature of the oil can vary depending on the requirements. At high temperatures, the treatment should be carried out by pressure.

Sulfuric acid, hydrochloric acid and phosphoric acid can be extracted from inorganic acids. Formaldehyde may be replaced by paraformaldehyde.

After the formaldehyde treatment, the product is washed with water and dried. Glued material, processed by decree) is applicable to inflatable boats, various air and gas balloons, etc.

P pi and iM ep 1. A film of thickness and 0.04 mm, obtained by pouring out TiBopa in alcohol, methylene chloride and water of a mixed polymer-isate from 60 parts of adipic acid hexaMetklbndia1M: ina and 40 parts of g-caproltamta, glued on a fabric consisting of polyamide prepared from g-caprolactam and weighing 50 g / m. Glued material is processed for 6 minutes. three 75 ° C in a solution of 50 parts of formalin, 5 parts of water, 10 parts of sodium chloride, and 2 parts of aluminium chloride.

The treated fabric is washed: watered with water and dried. The frostiness increased to -minus 20 ° against the initial one, r.avnoy minus 5 °. The material becomes insoluble in conventional solvents.

EXAMPLE 2 Polychlorinated perchlorinated yarn fabric, weight 60 gDiz, watered from two

sides at room temperature with a 20% solution of a mixture of polymerization of 50 parts of adipino (acidic hexa-methylene dienes a and 50 parts of e-lactam). The solvent is a mixture of alcohol, water and methylene chloride. For uniform coating of the fabric on both sides, its fibers under a filler In addition, the treatment is carried out for 10 minutes with a 30% formalin solution, acidified with 0.5% hydrochloric acid, at a temperature of 70. After washing and drying, the material becomes soft and frost resistant.

Subject invention

Oposab improves the elasticity, softness and frost-resistance of thin gas and water-proof materials: polyamide resin materials by means of aldehyde treatment, the same materials that are treated with composite materials. , consisting of a polyamide film, deposited on a fabric of acid-resistant nolamide resins or other acid-absorbing high-polymer compounds, for which these materials can be treated for several minutes with an acidic paiOTiBOpOM headlight1Maldehyde at elevated temperature and, if necessary, under pressure .