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Preparation method of jute viscose

A viscose fiber and alkali cellulose technology is applied in the field of preparation of hemp viscose fiber, which can solve the problems of low strength of hemp viscose fiber and affect the strength of cellulose, so as to achieve short production cycle, increase swelling degree, and reduce content Effect

Active Publication Date: 2012-09-05
HEBEI JIGAO CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sharp breakage of the cellulose molecular chain will affect the strength of the cellulose, so that the obtained hemp viscose fiber has a lower strength.
At the same time, the aging treatment of hemp pulp will produce more hemicellulose when the cellulose is depolymerized. low intensity

Method used

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  • Preparation method of jute viscose

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preparation example Construction

[0017] The invention provides a kind of preparation method of hemp viscose fiber, comprising:

[0018] The hemp pulp is soaked, squeezed and pulverized to obtain alkali cellulose, and the average degree of polymerization of the hemp pulp is 400-450;

[0019] After the alkali cellulose is treated by yellowing, dissolving and filtering, a spinning dope solution is obtained;

[0020] The spinning glue solution is spun to obtain hemp viscose fiber.

[0021] The invention uses the hemp pulp with a lower average degree of polymerization as raw material to produce the hemp viscose fiber, and does not need to go through aging steps to adjust the molecular weight of the hemp pulp, so that the cellulose molecular chain will not be broken sharply, so that the strength of the fiber will not be reduced . According to the present invention, the average degree of polymerization of the hemp pulp is 400-450.

[0022] In order to avoid that hemicellulose has an impact on crystallinity and or...

Embodiment 1

[0033] Put 15kg of hemp pulp with an average degree of polymerization of 450, a cellulose content of 92%, an ash content of 0.14%, an iron content of 20ppm, and a whiteness of 79% into the soaking tank, and soak for 20 minutes at 95°C. Alkali 220g / L is used; the impregnated hemp pulp is squeezed, pulverized and cooled to obtain alkali cellulose; the alkali cellulose is put into a yellowing machine for yellowing, the initial temperature of yellowing is 21°C, and the final temperature is At 28°C, the amount of carbon disulfide is 38% of the hemp pulp. After yellowing for 70 minutes, the obtained material is dissolved, filtered, defoamed, and filtered to obtain a spinning dope; the spinning dope is put into a spinning machine, According to the ratio of sulfuric acid 120g / L, sodium sulfate 320g / L and zinc sulfate 13g / L, an acid bath is formed to spin the spinning dope solution at 50°C to obtain hemp viscose fiber, and the hemp viscose fiber is Cutting and drying are carried out to...

Embodiment 2

[0036] Put 20kg of hemp pulp with an average degree of polymerization of 400, a cellulose content of 91%, an ash content of 0.10%, an iron content of 23ppm, and a whiteness of 79% into the soaking tank, and soak for 30 minutes at 75°C. Alkali 260g / L is used; the impregnated hemp pulp is squeezed, pulverized and cooled to obtain alkali cellulose; the alkali cellulose is put into a yellowing machine for yellowing, the initial temperature of yellowing is 21°C, and the final temperature is At 28°C, the amount of carbon disulfide is 38% of the hemp pulp. After yellowing for 70 minutes, the obtained material is dissolved, filtered, defoamed, and filtered to obtain a spinning dope; the spinning dope is put into a spinning machine, According to the ratio of sulfuric acid 120g / L, sodium sulfate 320g / L and zinc sulfate 13g / L, an acid bath is formed to spin the spinning dope solution at 50°C to obtain hemp viscose fiber, and the hemp viscose fiber is Cutting and drying are carried out to...

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Abstract

The invention provides a preparation method of jute viscose. The method comprises the following steps of: infusing, pressing and grinding jute pulp to obtain alkali cellulose, wherein the average degree of polymerization of the jute pulp ranges from 400 to 450; yellowing, dissolving and filtering the alkali cellulose to obtain spinning glue liquor; and spinning the spinning glue liquor to obtain jute viscose. The invention does not need to adjust the degree of polymerization and omits the ageing procedure by directly using the jute pulp with lower average degree of polymerization as the material to prepare the jute viscose. The invention avoids sharp rupture of cellulose molecular chain and reduces the influence on the fibre intensity as the ageing procedure is not needed. A test proves that the dry fracture strength of the jute viscose prepared by the method is not less than 2.30cN / dtex, the wet fracture strength is not less than 1.30cN / dtex, the dry rupture elongation rate is not less than 18% and the flaw is not more than 5mg / 100g.

Description

technical field [0001] The invention relates to the technical field of chemical fibers, in particular to a preparation method of hemp viscose fibers. Background technique [0002] Viscose fiber is a regenerated cellulose fiber obtained from natural cellulose such as wood and cotton linters through cooking, acid treatment, and bleaching. Viscose fiber has the advantages of good hygroscopicity, moisture release and soft hand feeling, and is an important textile raw material. However, wood viscose or cotton viscose are not antimicrobial. [0003] Hemp viscose fiber is a viscose fiber obtained from hemp pulp. It has become a research hotspot because of its light texture, smoothness, softness, antibacterial and antibacterial properties. The prior art discloses a variety of preparation methods of hemp viscose fiber. For example, Chinese patent document 200410004397.8 discloses a method for obtaining hemp pulp through cooking, alkali refining, bleaching and acid treatment, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F2/06
Inventor 宋德武郑书华梁立波李振峰薛振军张焕志范小永范梅欣
Owner HEBEI JIGAO CHEM FIBER
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