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Process for producing cotton dissolving pulp

A production process and technology of cotton pulp, applied in pulp bleaching, pulp dehydration, pulp beating methods, etc., can solve the problems of no fiber length and freeness, and achieve the effect of uniform fiber length, less water-soluble matter, and less dust

Active Publication Date: 2010-03-03
山东银鹰股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent, application number is: " 2006100684849 ", and a title disclosed is " a kind of high degree of polymerization cotton pulp and preparation method thereof ", take cotton linter as raw material, produce the cotton pulp of high degree of polymerization, there is no to The fiber length and freeness are controlled, and the degree of polymerization reaches 800-2800 through the quality index of the finished product. It can only be used in industries such as viscose fiber and low-grade carboxymethyl cellulose ether.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Material selection, cotton opening, dry impurity removal: select 85% of cotton linters with 80% first-class maturity of the second category and 15% of cotton linters with 79% of the first-level maturity of the third category, and use open cotton The cotton linters are torn by the machine, and the impurities are selected and removed by the impurity remover, and then sent to the screw press and impregnated through the cyclone separator;

[0047](2) Alkali blending and impregnation: The temperature of alkali blending is controlled at 68°C, the relative absolute dry pulp volume is 16% in terms of NaOH, the ratio of alkali solution is 1:4, and the relative absolute dry pulp amount of HY-PA penetrating agent is 0.45%. Extruded by a screw, fully infiltrated and mixed with linters, conveyed by a screw to the cooking process;

[0048] (3) Cooking, the first heating temperature is 115°C, after the first heating for 22 minutes, the first steam release is performed for 15 minut...

Embodiment 2

[0073] (1) Material selection, cotton opening, dry impurity removal: select 85% of cotton linters with 80% first-class maturity of the second category and 15% of cotton linters with 79% of the first-level maturity of the third category, and use open cotton The cotton linters are torn by the machine, and the impurities are selected and removed by the impurity remover, and then sent to the screw press and impregnated through the cyclone separator;

[0074] (2) Alkali blending and impregnation: The temperature of alkali blending is controlled at 69°C, the relative dry pulp volume is 16.5% in terms of NaOH, the ratio of alkali solution is 1:4.1, and the relative dry pulp volume of HY-PA penetrant is 0.46% , through screw extrusion, fully infiltrated and mixed with cotton linters, and conveyed to the cooking process through screw;

[0075] (3) Cooking, the first heating temperature is 116°C, after the first heating for 23 minutes, the first steam release is performed for 15 minutes...

Embodiment 3

[0100] (1) Material selection, cotton opening, dry impurity removal: select 90% of the cotton linters with 79% of the first-class maturity of the second category and 10% of the linters of the third-level first-level maturity of 79%. The cotton linters are torn by the machine, and the impurities are selected and removed by the impurity remover, and then sent to the screw press and impregnated through the cyclone separator;

[0101] (2) Alkali blending and impregnation: The temperature of alkali blending is controlled at 70°C, the relative absolute dry pulp volume is 16.8% in terms of NaOH, the ratio of alkali solution is 1:4.3, and the relative absolute dry pulp amount of HY-PA penetrating agent is 0.49%. Extruded by a screw, fully infiltrated and mixed with linters, conveyed by a screw to the cooking process;

[0102] (3) Cooking, the first heating temperature is 117°C, after the first heating for 23 minutes, the first steam release is performed for 15 minutes, and the second ...

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Abstract

The invention relates to a production technique of a dissolved cotton pulp, in particular to a production technique that utilizes the raw material of cotton linters and adopts simple techniques to produce the dissolved cotton pulp with even fiber length, high fibrillation degree, good intensity, less water soluble substances, high methylcellulose content, stable polymerization degree and less dust, has low COD discharge in waste water, and lowers environmental pollution. The dissolved cotton pulp produced by the production technique is mainly used for producing paper that is used for wiping upper-scale precise instruments, steel paper that is used for precise machining, a novel medicine loading agent of microcrystalline cellulose, explosive nitrocellulose, high-level nitrolacquer and building coating materials, etc.

Description

technical field [0001] The invention relates to a cotton pulp production process, in particular to a cotton pulp production process using cotton linters as raw materials, which is mainly used to produce high-grade precision instrument wiping paper, steel paper for precision machining, and new pharmaceutical fillers A microcrystalline cellulose and explosive nitrocellulose and advanced nitro lacquer and architectural coatings. Background technique [0002] In recent years, in the international market, companies in industries such as nitrocellulose, which manufactures explosives with strong explosive force and strong action, and pharmaceutical new drug extenders, have continuously increased demand for this product, which is a favorable condition for the development of this product . [0003] my country is a big cotton producing country with abundant cotton linters resources. In Xinjiang, Hebei, Shandong, Jiangsu and other high-quality cotton producing areas, there are suffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21C7/00D21C9/00D21D1/02D21C9/14D21D1/20D21C9/18
Inventor 李桂荣毕立强陈忠国周竹林曹知朋朱永德刘玉方臧贻朋刘国林
Owner 山东银鹰股份有限公司
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