SU771121A1 - Solution for film forming - Google Patents

Description

The invention relates to the chemical industry, in particular, to the field of preparing solutions for forming films based on cellulose esters. It can be used in the manufacture of artificial fiber and film materials. Polymer products obtained from such solutions possess improved consumer and operational properties. A fiber forming solution is known, consisting of cellulose triacetate, a solvent and 1,2,3-benz triazole ij. However, the resulting products do not have high light and heat resistance. A known film forming solution consisting of cellulose triacetate, propolis alcohol fraction, and solvent 2. Colored films are obtained that have a low light and heat resistance; in addition, the color is unstable to wet treatments. The aim of the invention is to increase the light and heat resistance of the films, as well as to make the films color resistant to heat-wet processing and natural insolation. The goal is achieved by the fact that the solution for forming films consisting of cellulose triacetate, a solvent and a modifying additive, as a modifying additive contains 1- (quinoxaline-2) -3, 5-diphenylformazan or its nickel or cobalt complexes in the following ratio components, wt.%: Cellulose triacetate Modifying additive 0,006-0,07 Remaining Solvent The introduction of formazan derivatives into a solution of cellulose triacetate prevents the destruction of polymers from thermo-oxidative degradation in otsesse posledunvdih technological treatments, and protects them from degradation by factors natural INSOL tion during operation of finished articles based on these materials. In addition, film materials acquire stains that are resistant to various physicochemical effects.

Example 1. To obtain films, a spinning solution is used containing the following components / wt.%;

Cellulose triacetate 9 1- (Hinoksalin-2) -3,5-diphenylformazan 0, 006 Solvent Rest A solution of cellulose triacetate with an acetyl number of 61.8% is dissolved in an organic solvent — a mixture of methylene chloride and ethanol (volume ratio 9: 1) containing 1 - (hinoxalin-2) 3; 5-diphenylformaean. The preliminary dissolution of the modifying additive in the above binary mixture ensures its more even distribution in the resulting polymer compositions.

After thorough mixing for 30–40 min and complete visual homogenization, the polymer solution is filtered off from the jets of particles on a polyethylene filter, and then dehydrated at 20 s.

The polymer solution thus prepared is applied through a flat surface.

vO slit die on the glass surface where the solvent evaporates slowly. The speed of movement of the die is maintained constant. Average film thickness

15 is 40-50 microns. The properties of the films are presented in the table.

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Claims (2)

Example 2. To obtain films, a spinning solution containing the following components is used, wt%: Cellulose triacetate9 Ni-complex 1- (quinoxapin-2:) - 3, 5-diphenylformazane 0.014 Solvent Remaining Preparation of a spin solution of the polymer and The molding of the polyester was carried out according to the procedure of Example 1. Example 3. To obtain films, a spinning solution containing the following components is used (wt.% 1: Cellulose triacetate9 Co-complex 1- (quinoxaline-2 -3, 5 -diphenylformazan 0.07 Solvent Else Samples cellulose acetate triacetate Nok is subjected to ultraviolet irradiation using a full-spectrum PRK-2 mercury-quartz lamp. Artificial insolation is carried out at room temperature in air. The test films are fixed at a distance of 30 cm from the light source. darkness for 120-150 hours to eliminate the effect on further research on the effect of the aftermath. After irradiation of the triacetate-cellulose films, a decrease in the intrinsic viscosity of the polymers is measured. The thermostability of the modified cellulose triacetate films is evaluated by the kinetics of mass changes depending on the chemical nature and the content of the modifying additive and the heating temperature under isothermal conditions. The use of the proposed solution for forming films provides, in comparison with the existing ones, the following advantages: the possibility of obtaining films with both high photo and heat resistance without reducing the basic physicomechanical and operational characteristics of giving the etched cellulose films colors in various colors that are resistant to heat and humidity treatments and factors of natural insolation. The technology for forming films from the proposed solution does not change as compared to that used for a known solution. Claims for forming films consisting of cellulose triacetate, a solvent and a modifying agent, characterized in that, in order to increase the light and heat resistance of the films, the solution contains 1- (quinoxaline-2) -3.5 as a modifying agent. -diphenylformazan or its nickel or cobalt complexes in the following ratio of components, wt.%: Cellulose triacetate Modifying additive 0,006-0,07 Remaining. Solvent Sources of information taken into account during the examination 1. USSR Author's Note 463758, cl. D 01 F 1/02, 03.05.73. 2. Authors certificate of the USSR 539047, cl. C 08 L 1/10, 01/15/75 (prototype).