SU1633033A1 - The way of obtaining the solution for chemical fibre formation - Google Patents

Abstract

The invention relates to the production of chemical fibers, in particular, to a solution for the formation of a chemical fiber from natural fibroin silk, polyacrylonitrile, or mixtures thereof. The invention allows to intensify the process due to mechanical mixing of the components by the action of shear deformations when shear stress is 0, E06-10-106 N / m. The solution contains fiber-forming polymer, inorganic salt and water in a ratio of 1: (0.66-2) :( 0.1-0.8), respectively. Calcium or zinc chlorides, or barium, or barium, or lithium, or sodium chlorides are used as the inorganic salt, and the fiber-forming polymer is selected from the group consisting of natural silk, fibroin, polyacrylonitrile, or mixtures thereof. 1 hp ff, 1 tab. (L mass ratio of 1: 2: 0.8. In a rotary mill, the mixture is stirred and subjected to shear deformations. The shear stress for the bottom mixture I -10e H / m2. After 10 minutes, the mill leaves a spinning solution in the form of a uniform viscous masses with fiber-forming properties. A solution is obtained with a concentration of 26.3 wt.% polymer. Examples 2-9. The solution is obtained analogously to example 1, but different ratios of salt and water are used, C & 00 CO CO CO

Description

Examples 10-11. The solution is prepared as in Example 1, but various solutions are used for dissolving

salt.

Examples 12-15, A solution is prepared analogously to example 1, but PAN and PAN / natural silk blends are used as a fiber-forming polymer with different component ratios.

Examples 16-20. The solution is prepared analogously to example 1, but natural silk boiled in soda-soap solution is used as a fiber-forming polymer. Such processed natural silk is natural silk fibroin (sericin, the top layer of silk fiber, goes into solution). The shear deformations are carried out at different shear stresses.

EXAMPLE 21 Mill is charged with 50 g of natural silk fibroin, 100 g of sodium Rodan and 40 ml of water in a ratio of 1: 2: 0.8, respectively. In a rotary mill, the mixture is processed and subjected to shear deformations when applied to a shear of 10 10. After 10 minutes, a uniform viscous mass emerges from the mill.

The resulting mass is dissolved in a mixture of water and glacial acetic acid, taken in a 2: 1 ratio, and the concentration of fibroin in the solution is 25%. Dissolution time 10–15 min. The resulting solution is filtered under pressure, deaerated and formed into a fiber by the wet method.

Example 22. 50 g of natural silk fibroin, sprinkled with 90 g of calcium chloride, and 40 ml of water in bulk COOT wearing 1: 1.8: 0.8 are loaded into the mill bunker. In a rotary mill, the mixture is stirred and subjected to shear deformations. The shear stress for this mixture is 2106 N / m4. After 10-12 minutes

the mill leaves a solution in the form of a viscous mass containing no fiber inclusions. The resulting solution has fiber-forming properties, the concentration of fibroin in it is 28%. Example 23. 50 grams of natural silk fibroin, sprinkled with 90 g of rodanite barium, and 25 ml of water in a weight ratio of 1: 1.8: 0.5 are loaded into the laboratory mill bunker. In a rotary mill, the mixture is stirred and subjected to shear deformations with a shear stress of 140e N / m2. After 8–10 minutes, a spinning solution comes out of the mill in the form of a homogeneous, viscous mass containing no fiber inclusions. The resulting solution has fiber-forming properties, the concentration of fibroin in NehmUZO%.

PRI me R 24 (comparative). Natural silk, zinc chloride and water in a ratio of 1: 6.2: 4.7 are stirred with a magnetic stirrer for 5 hours until a homogeneous solution with a concentration of 8.5% is obtained, it is difficult to form a fiber from the resulting solution.

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Claims (2)

1. A method of preparing a solution for forming a chemical fiber by mechanical agitation of a polymer selected from the group comprising natural silk, fibroin, polyacrylonitrile or a mixture thereof, with inorganic salt and water, characterized in that, in order to intensify the process, the agitation is carried out by applying shear deformations with a shear stress of 0.1 106-10 106 N / m2 with a ratio of polymer: inorganic salt: water components equal to 1: 0.66-2.0: 0.1-0.8, respectively. ° 2. The method according to claim 1, which is based on the fact that calcium or zinc chloride, or sodium or barium rodanide, or lithium is used as the inorganic salt.