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Method for preparing cellulose spinning stock solution

A technology for spinning dope and cellulose, which is used in fiber processing, spinning solution preparation, textiles and papermaking, etc., can solve the problems of unavailability and pollution of twin-screw extruders, improve fluidity, strengthen dissolution effect, Beneficial effects on stretching and molecular orientation

Active Publication Date: 2012-02-22
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the perspective of sustainable development, these three types of fibers have their own problems: synthetic fibers use petroleum as raw materials, which are disposable resources that will eventually be exhausted; natural fibers such as cotton and hemp are affected by land, climate, and water resources. It is impossible to increase a large amount of restrictions; although viscose fiber is made of renewable cellulose, there is serious pollution.
[0021] It can be seen that using a twin-screw extruder to dissolve a polymer to prepare a spinning dope is an effective method, but due to the use of an alkali / urea (or thiourea) aqueous solution system to prepare a cellulose spinning dope requires conditions such as ultra-low temperature, existing The twin-screw extruder can't be realized, and the method of spinning stock solution of cellulose / alkali / urea (or thiourea) aqueous solution system by using twin-screw extruder and wiped-film thin film evaporator has never been reported.

Method used

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  • Method for preparing cellulose spinning stock solution
  • Method for preparing cellulose spinning stock solution
  • Method for preparing cellulose spinning stock solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A 7wt% NaOH / 11wt% urea mixed aqueous solution was prepared, cooled to -10°C, and kept at a constant temperature. Then feed it into the feed port of the twin-screw extruder at a flow rate of 29.1kg / h, and feed the wood pulp with a degree of polymerization of 450 into the feed port of the twin-screw extruder at a feed rate of 0.9kg / h , so that once in contact with the solvent it is fed into the interior of the twin-screw extruder by the rotating helical elements.

[0071] The speed of the twin-screw extruder is 120rpm, the temperature of the front 3 / 5 length is -10°C, the temperature of the middle 1 / 5 length is 0°C, and the temperature of the rear 1 / 5 length is 25°C, and the temperature fluctuation of each section is controlled within ±1°C within range.

[0072] The discharge port of the twin-screw extruder is connected to the feed port of the wiped film thin film evaporator through a pipeline, and the material flow rate and the head pressure of the twin-screw extruder a...

Embodiment 2

[0075] Prepare the solvent according to the ratio of Example 1, cool it to -12°C, and keep it at a constant temperature. Then feed it into the feed port of the twin-screw extruder at a flow rate of 28.2kg / h, and feed the wood pulp with a degree of polymerization of 450 into the feed port of the twin-screw extruder at a feed rate of 1.8kg / h , so that they are fed into the interior of the twin-screw extruder by the rotating screw elements as soon as they come into contact with each other.

[0076] The speed of the twin-screw extruder is 200rpm, the temperature of the front 4 / 5 length is -10°C, the temperature of the rear 1 / 5 length is 0°C, and the temperature fluctuation of each section is controlled within the range of ±1°C.

[0077] The discharge port of the twin-screw extruder is connected to the feed port of the wiped film thin film evaporator through a pipeline, and the material flow rate and the head pressure of the twin-screw extruder are controlled by a metering pump in ...

Embodiment 3

[0080] Prepare the solvent according to the ratio of Example 1, cool it to -12.5°C, and keep it at a constant temperature. Then feed it into the feed port of the twin-screw extruder at a flow rate of 27.6kg / h, and simultaneously feed the wood pulp with a degree of polymerization of 450 into the feed port of the twin-screw extruder at a feed rate of 2.4kg / h , so that they are fed into the interior of the twin-screw extruder by the rotating screw elements as soon as they come into contact with each other.

[0081] The rotational speed of the twin-screw extruder is 300rpm, the temperature of the twin-screw extruder is all -10°C, and the temperature fluctuation of each section is controlled within the range of ±1°C.

[0082] The discharge port of the twin-screw extruder is connected to the feed port of the wiped film thin film evaporator through a pipeline, and the material flow rate and the head pressure of the twin-screw extruder are controlled by a valve or a gear metering pump...

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Abstract

The invention discloses a method for continuously preparing a cellulose spinning stock solution by using a double-screw extruder together with a film-scraping film evaporator. The method comprises the following steps of: feeding cellulose and a solvent into a cellulose feeding hole and a solvent feeding hole of the double-screw extruder respectively; and dissolving the cellulose, and defoaming to obtain the cellulose spinning stock solution. In the invention, high shearing action provided by the double-screw extruder and the film-scraping evaporator has contribution to relief of macromolecular chain entanglement and flow orientation, so that the rheological property and spinning property of the spinning stock solution are enhanced, and the stretching and macromolecular orientation in the spinning process are facilitated. Due to the adoption of the method, continuous stable preparation of the spinning stock solution is well realized, and industrialization of regenerated cellulose fiber in a solvent system is facilitated.

Description

technical field [0001] The present invention relates to a kind of preparation method of cellulose spinning dope, more specifically the present invention relates to a kind of twin-screw extruder / wiped film type thin film evaporator combined use to prepare cellulose / alkali / urea (or thiourea) spinning Silk stock solution method. Background technique [0002] Cellulose is the most abundant natural renewable resource on the earth, and it can be degraded naturally, and the degradation products will not pollute the environment. The stock of cellulose in nature is about 700 billion tons, and it is still being regenerated at a rate of 40 billion tons per year. At present, it is mainly used in fiber, papermaking, film and other fields. [0003] Due to technical constraints, its development and utilization is still very low. Just take the fiber industry as an example. In 2009, the total global fiber output was about 70 million tons, of which 41.6 million tons were synthetic fibers, ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/02D01D1/10
Inventor 孙玉山陈功林孔令熙陆伊伦李方全张均朱庆松徐纪刚骆强李晓俊程春祖
Owner CHINESE TEXTILE ACAD
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