SU763488A1 - Method of producing acetylcellulose solution for fiber moulding - Google Patents

Description

preparing prilny

solution known method.

Example I. In accordance with the indicated technology, ammonium oxalate is dissolved in water in an amount of 0.1 wt.% Based on the weight of cellulose acetate, a spinning solution is prepared and its properties as well as the properties of the yarn obtained from it are determined. The concentration of the solution is 27.2 wt. %; viscosity 1180 Pzg breakage when forming 12.1 breaks per 1000 spindles per hour; linear density b, 7tex, relative thread strength 10.5 gf / tex; elongation of the thread with a gap of 25.4%.

Method for reducing viscosity of cellulose acetate solution

Electrophoresis method

Offered a way

Example 2. Ammonium oxalate is mixed with water in an amount of 0.2% by weight of cellulose acetate, a dope is prepared and its properties as well as the properties of the yarn obtained from it are determined. The concentration of the solution is 27.1 wt.%; Viscosity 1173 Pz; breakage in the formation of 12.15 cliffs per 1000 spindles per hour; linear density of 6.7 Tex, the relative strength of the thread 10.5 g / Tex; elongation of the thread at break 25.6% 4

The advantages of the proposed method in comparison with the known are presented in the table.

Change in viscosity by

Time through

2 months

20 minutes

1 month

1770

1776

1768

1175

1181

1180

Claims (2)

Further stabilization of the solution viscosity is not necessarily based on the production technology of acetate filaments. It can be seen from the table that a decrease in viscosity by introducing ammonium oxalate into the dope simplifies the process, i.e. there is no need for swelling, acid treatment, washing, filtering and drying cellulose acetate. Reduced product losses, reduced process time, improved physicochemical properties of the spinning solution (concentration, viscosity and quality of the resultant satisfy the requirements of GOST. The technology of reducing the viscosity of the cellulose acetate solution is simple, implementation is easy. cellulose acetate solution to form the fibers, including the displacement of water with acetone and the subsequent dissolution of acetylcellulose in a water-acetone mixture, characterized in that in order to reduce The viscosity of the solution, the simplification and reduction of the process, dissolve 0.1-0.2% of the weight of ammonium oxalate acetylcellulose with ammonium oxides in the water before mixing. F 1/02, 13.07.61. 2. Authors certificate of the USSR 506649, cl. R 01 2/28, 10.05.72 (prototype).