SU933835A1 - Method of producing viscose rayon fibre and filament - Google Patents

Description

(5) METHOD OF OBTAINING VISCOSE FIBER AND THREAD

one

The invention relates to the production of viscose fibers.

The closest to the present invention is a method for producing viscose fiber and fl thread}, which includes molding the viscose into an aqueous precipitation bath containing 2-3 naphthenesulfonic acids with n 10-20, 25-60 g / l sulfuric acid, 100-180 g / l aluminum sulphate and 50120 g / l sodium sulphate, followed by finishing and drying the molded products. Get fiber with improved physico-mechanical properties.

The disadvantages of the method include the low molding speed (not more than 50 m / min for staple fiber and not more than 90 m / min for textile yarn).

The aim of the invention is to increase the molding speed.

The goal is achieved in that a method of producing viscose fiber and yarn, including molding viscose into an aqueous precipitation bath containing naphthenic sulfonic acid CH SOjII with n 10-20, sulfuric acid, aluminum sulphate and sodium sulfate, finishing and drying molded products, use a precipitation bath in the following ratio of components, naphthensulfonic acid

8-15

to

Sulfuric acid

50-100

itO-lOO

Aluminum sulphate

2 0-320

Sodium sulfate

Up to 1 m.

Water

With the addition of naphthenesulphonic acids

IS improves the wettability of the fiber, increases the stability of the molding and increases the solubility of carbon disulfide in the precipitation bath.

Claims (1)

Example 1. Viscose containing 8.5% of c (cellulose and 6.2 sodium hydroxide and having maturity 17 of ammonium chloride and viscosity i c is molded through a spinneret with 10,000 holes 0.05 mm in diameter into a precipitation bath containing 50 kg / m of sulfuric acid, 40 kg / m of aluminum sulphate, 320 kg / m of sodium sulphate and 15 kg / m of naphthenesulphonic acids .80} And (n, 10-20) at kQ C. The formed fiber is pulled over. The molding speed is 60 m / min, the fiber obtained has a strength of 28 gf / tex and an elongation of 2k%, loss of strength in the wet state. The carbon disulfide content in the service area is 0.8 mg / m. Example 2 A viscose containing 7.5 nd cellulose and 6.0% sodium hydroxide and having matured 19% ammonium chloride and a viscosity of 35 s is molded through a spinneret with 10,000 holes 0.05 mm in diameter into a precipitation bath containing 66 kg / m of sulfuric acid, 88 kg / m of aluminum sulphate, 300 kg / m of sodium sulphate and 12 kg / m of naphthenesulphonic acids Gi, Ifriyi4-2.i at a temperature of 8 ° C. The formed fiber is drawn out by 50. The molding speed is 70 m / min. The fiber obtained has a strength of 28 gf / tex and an elongation of 23. Loss of strength in the wet state tO. The air in the service area contains 1.2 mg / m carbon disulfide. When spinning fiber in a naphthensulfonic acid-free bath, the air in the service area contains 15 mg / m of carbon disulfide. Example 3. Viscose, containing 8.0% od-cellulose and 6.5% sodium hydroxide and having a maturity of 20 for ammonium chloride and a viscosity of 50 s, is molded through a spinneret from 25 versts 0.05 mm in diameter to a precipitation bath containing 100 kg / sulfuric acid, 100 kg / m of aluminum sulphate 5, Q kg / m sulphate of sodium and 8 kg / m of naphthenesulphonic acids С H n + SOjII at a temperature. The formed fiber is stretched by 30%. The molding rate is IlO m / min. The resulting textile yarn has a strength of g / tex and an elongation of 23%. Loss of strength in the wet state is 35%. The invention makes it possible to significantly increase the rate of forming viscose fibers and yarn, which, in turn, leads to an increase in spinning equipment productivity by 15-25%. Claims method of obtaining viscose fiber and yarn, including molding viscose into an aqueous precipitation bath containing naphthenesulfonic acid C at ix: 10-20, sulfuric acid, aluminum sulfate, sodium sulfate and water, finishing and drying molded products, characterized in that In order to increase the rate of molding, a precipitation bath is used in the following ratio of components,. Naphthenesulphonic acid C, 50-100 Sulfuric acid 40-100 Aluminum sulfate 2 40-320 Sodium sulfate Vodado 1 m Sources of information taken into account during the examination 1. USSR author's certificate for application No. 2657300/23 05, cl. D 01 F 2/08, 1978 (prototype).