Wet spinning method of cellulose carbamate

Abstract

The invention relates to a wet spinning method of cellulose carbamate. The wet spinning method comprises steps as follows: 1) filtration: all pipelines, middle barrel and filters used in the filtration process are in jacket type, and the temperature of a circulation liquid in the jackets is controlled at 8-15 DEG C; 2) temperature adjustment: the temperature of a plate type heat exchanger is controlled at 12-30 DEG C before defoaming; 3) defoaming: the absolute vacuum degree of a continuous vacuum defoamer (basket type or overflow type) is controlled between 97 mpa.s and 99.9 mpa.s; 4) acid bath forming: colloid directly enters an acid bath of a spinning machine for spinning and acid-bath forming after being defoamed and filtered, and fiber tows are regenerated; 5) secondary bath drafting forming: the fiber tows formed in the acid bath are subjected to drafting forming through a draw-off godet and moves to a secondary bath provided with a first-stage drafting machine, wherein the secondary batch contains 0-5% of sulfuric acid and has the temperature of 25-70 DEG C; 6) refining: all that is required is that the fiber tows are washed, blanched (or not blanched), oiled, opened and dried in a drying machine for packaging in the refining process.

Description

technical field [0001] The invention relates to a spinning method, in particular to a wet spinning method of cellulose carbamate, and belongs to the technical fields of regenerated cellulose fiber, cellulose film, sponge and the like. Background technique [0002] At present, in the production process of regenerated cellulose fiber, regenerated cellulose film, sponge, etc., the traditional technology is mainly carbon disulfide method and copper ammonia method, and the modern technology is mainly NMMO method. These two methods have some special problems and are difficult to produce. overcome. First of all, the carbon disulfide method and the copper ammonia method have problems such as toxic and harmful waste gas, waste water, flammability and explosion, which seriously affect the environment and people's health. The NMMO method also has solvents that are dependent on imports and are expensive. There are also problems such as difficult solvent recovery, flammability and explo...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of regenerated cellulose fiber, regenerated cellulose film, sponge, etc., the traditional technology is mainly carbon disulfide method and copper ammonia method, and the modern technology is mainly NMMO method. These two methods have some special problems and are difficult to produce. overcome

First of all, the carbon disulfide method and the copper ammonia method have problems such as toxic and harmful waste gas, waste water, flammability and explosion, which seriously affect the environment and people's health.

The NMMO method also has solvent dependence on imports and is expensive, and there are still problems such as difficult solvent recovery, flammability and explosion, and technical barriers in production.