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Dissolving method of cellulose carbamic acid ester

A technology of carbamate and cellulose, applied in the field of technology, can solve the problems of flammability and explosion, technical barriers, and difficulty in solvent recovery, and achieve the goal of preventing gel or gel phenomenon, simple operation process and shortening process time Effect

Inactive Publication Date: 2018-01-09
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

[0016] Embodiment 1: a kind of dissolving method of cellulose carbamate, described dissolving method is as follows:

[0017] Add 30kg of 9% sodium hydroxide liquid into the stirring swelling kettle, then add 2.97kg of cellulose carbamate (water content 9%), stir at room temperature for 10 minutes, and then pump it to a screw The agitated feeding barrel of the machine (single-screw machine or twin-screw machine) enters the screw machine (single-screw machine or twin-screw machine) by its own weight to dissolve and return to temperature. The minimum temperature at the front 2 / 3 of this screw machine (single screw machine or twin screw machine) is controlled at -15 degrees, and the temperature at the back 1 / 3 is controlled at 10 degrees. Then it enters the storage tank with jacket and stirring by its own weight, and the temperature of the circulating fluid in the jacket is 12 degrees. The test data of the prepared colloid are: temperature 11 degrees, falling ball viscosity 45 se...

Embodiment 2

[0018] Embodiment 2: a kind of dissolving method of cellulose carbamate, described dissolving method is as follows: add the demineralized water of 27.3kg in the expansion kettle with jacket band agitation, add the caustic soda of 2.7kg again, treat that liquid is clear Then add 2.97kg of cellulose carbamate (water content 4%) to stir and swell, during which the temperature of the circulating fluid in the jacket is 12 degrees. After 10 minutes, it is pumped to a screw machine (single-screw machine or twin-screw machine) with stirring feeding barrel, enters a screw machine (single-screw machine or twin-screw machine) by its own weight for dissolution, and then enters by its own weight The next screw machine (single-screw machine or twin-screw machine) is used for dissolving and returning to temperature. The lowest temperature of the first unit is -13 degrees, the lowest temperature of the second unit is -15 degrees, and the highest temperature in the reheating section is 11 degr...

Embodiment 3

[0019] Embodiment 3: a kind of dissolving method of cellulose carbamate, described dissolving method is as follows: in the swelling kettle of band jacket band agitation, add the 9% sodium hydroxide liquid of 30kg, then add the cellulose of 2.97kg Carbamate (water content 9%), stirred for 10 minutes, during which the temperature of the circulating fluid in the jacket was 12 degrees. Then it is pumped to a screw machine (single screw machine or twin screw machine) with stirring feeding barrel, and enters the screw machine (single screw machine or twin screw machine) by its own weight to dissolve and return to temperature. The minimum temperature at the front 2 / 3 of this screw machine (single screw machine or twin screw machine) is controlled at -15 degrees, and the temperature at the back 1 / 3 is controlled at 10 degrees. Then it enters the storage tank with jacket and stirring by its own weight, and the temperature of the circulating fluid in the jacket is 12 degrees. The test ...

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Abstract

The invention relates to a dissolving method of cellulose carbamic acid ester. The dissolving method comprises the following steps: 1) conducting a swelling process; 2) continuously dissolving; 3) conducting a continuous temperature returning process; 4) enabling a dissolved and temperature returned colloid to enter a storage tank, wherein the storage tank is provided with a jacket and has a stirring function, the temperature of a circulation liquid in the jacket is 8-15 DEG C, so that the quality of the colloid in the storage is kept stable, the method realizes continuous dissolution, the dissolved colloid is stable, the requirement of a regenerated cellulose fiber is completely met, and no wastewater or waste gas is discharged in the dissolving process.

Description

technical field [0001] The invention relates to a dissolving method, in particular to a dissolving method of cellulose carbamate, and belongs to the technical field 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 explos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05C08L1/08D01F2/24
Inventor 孙飞勇
Owner 孙飞勇
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