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Wet spinning method of cellulose carbamate

A urethane and wet spinning technology, which is applied in the field of technology, can solve problems such as technical barriers, difficulties in overcoming, and difficulties in solvent recovery, and achieve the effects of shortening the process flow, improving production efficiency, and reducing equipment investment

Inactive Publication Date: 2017-12-29
孙飞勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A wet spinning method of cellulose carbamate, the method is as follows, the dissolved glue is transported into a filter through a pump for filtration and then enters a storage tank, and the waste glue that is filtered and backwashed enters the waste glue recycling system. The glue in the storage tank is pumped into the plate heat exchanger and enters the continuous vacuum defoamer. The temperature of the plate heat exchanger is set at 25 degrees so that the temperature of the glue entering the continuous vacuum defoamer is also around 25 degrees. , the absolute vacuum degree in the continuous vacuum degasser is controlled at 97mpa.s. The degassed glue is pumped into the secondary filter for filtration and enters the pre-spinning storage tank, and the waste glue that is filtered and backwashed also enters the waste glue recovery system. The glue in the pre-spinning storage tank is pumped into the spinning machine for spinning. In the spinning machine, the glue goes thro...

Embodiment 2

[0020] A wet spinning method of cellulose carbamate, the method is as follows, the dissolved glue is transported into a filter through a pump for filtration and then enters a storage tank, and the waste glue that is filtered and backwashed enters the waste glue recycling system. The glue in the storage tank is pumped into the plate heat exchanger and enters the continuous vacuum defoamer. The temperature of the plate heat exchanger is set at 20 degrees so that the temperature of the glue entering the continuous vacuum defoamer is also around 20 degrees. , the absolute vacuum degree in the continuous vacuum degasser is controlled at 99mpa.s. The degassed glue is pumped into the secondary filter for filtration and enters the pre-spinning storage tank, and the waste glue that is filtered and backwashed also enters the waste glue recovery system. The glue in the pre-spinning storage tank is pumped into the spinning machine for spinning. In the spinning machine, the glue goes thro...

Embodiment 3

[0023] A wet spinning method of cellulose carbamate, the method is as follows, the dissolved glue is transported into a filter through a pump for filtration and then enters a storage tank, and the waste glue that is filtered and backwashed enters the waste glue recycling system. The glue in the storage tank is pumped into the plate heat exchanger and enters the continuous vacuum degasser. The temperature of the plate heat exchanger is set at 27 degrees so that the temperature of the glue entering the continuous vacuum degasser is also around 27 degrees. , the absolute vacuum degree in the continuous vacuum degasser is controlled at 98mpa.s. The degassed glue is pumped into the secondary filter for filtration and enters the pre-spinning storage tank, and the waste glue that is filtered and backwashed also enters the waste glue recovery system. The glue in the pre-spinning storage tank is pumped into the spinning machine for spinning. In the spinning machine, the glue goes thro...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/24D01D5/06D01D5/12
CPCD01F2/24D01D5/06D01D5/12
Inventor 孙飞勇
Owner 孙飞勇
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