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Production process of cotton pulp for cellulose triacetate

A cellulose triacetate, production process technology, applied in the direction of pulping of cellulose raw materials, post-treatment of cellulose pulp, pulping with inorganic alkali, etc., can solve the problem of not being able to meet the processing and use performance of liquid crystal display polarizers, and the inability to meet the requirements of manufacturing Special requirements for LCD polarizers, problems affecting the quality of LCD polarizers, etc., to achieve the effect of reducing the pressure of sewage treatment, low ash content, and suitable compactness

Active Publication Date: 2010-12-29
山东银鹰化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most important raw material for the preparation of cellulose triacetate is cotton pulp. The quality index of ordinary cotton pulp currently on the market cannot reach the high standard of cotton pulp used in the manufacture of triacetate fiber for liquid crystal display polarizers. Serious Among the problems that affect the quality of LCD polarizers, the most difficult problem for cotton pulp is that the content of dichloromethane extract and metal ion content meet the requirements, and the whiteness is low, which is far from meeting the processing and use of LCD polarizers. Performance, although very few companies have researched on the production of cellulose triacetate pulp, due to the use of refined cotton as a raw material, the content of dichloromethane extracts and metal ions is high, which cannot meet the special requirements for manufacturing liquid crystal display polarizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Material selection, cotton opening, and impurity removal process: select three types of first-class cotton linters with a maturity of 85%, use a cotton opener to tear the linters, loosen and remove impurities through the impurity remover, and then Transfer to the cotton collector, after selection and removal of impurities, it is sent to the screw press and impregnation through the cyclone separator;

[0034] (2) Alkali mixing and impregnation process: the temperature is controlled at 82°C, the total alkali is 17.0% in terms of NaOH, the relative dry pulp volume is 17.0%, the alkali solution ratio is 1:4.2, the hydrogen peroxide relative dry pulp volume is 1.5%, SDO-A The scouring agent is 3.0% relative to the absolute dry pulp. After being sprayed with lye in the cyclone separator, screwed and compressed, it is fully infiltrated and mixed with cotton linters, and then transferred to the catalytic reactor;

[0035] (3) Electrocatalytic reaction process: carried out i...

Embodiment 2

[0056] (1) Material selection, cotton opening, and impurity removal process: select three types of first-class cotton linters with a maturity of 82%, use a cotton opener to tear the linters, loosen and remove impurities through the impurity remover, and then Transfer to the cotton collector, after selection and removal of impurities, it is sent to the screw press and impregnation through the cyclone separator;

[0057] (2) Alkali mixing and impregnation process: the temperature is controlled at 80°C, the total alkali is 16.8% in terms of NaOH, the relative dry pulp volume is 16.8%, the alkali solution ratio is 1:4.1, the hydrogen peroxide relative dry pulp volume is 1.7%, SDO-A The scouring agent is 2.7% relative to the absolute dry pulp. After being sprayed with lye in the cyclone separator, screwed and compressed, it is fully infiltrated and mixed with cotton linters, and then transferred to the catalytic reactor;

[0058] (3) Electrocatalytic reaction process: carried out i...

Embodiment 3

[0079] (1) Material selection, cotton opening, and impurity removal process: select three types of first-class cotton linters with a maturity of 89%, use a cotton opener to tear the linters, loosen and remove impurities through the impurity remover, and then Transfer to the cotton collector, after selection and removal of impurities, it is sent to the screw press and impregnation through the cyclone separator;

[0080] (2) Alkali mixing and impregnation process: the temperature is controlled at 80°C, the total alkali is 16.6% in terms of NaOH, the relative dry pulp volume is 16.6%, the alkali solution ratio is 1:4.1, the hydrogen peroxide relative dry pulp volume is 1.6%, SDO-A The scouring agent is 2.9% relative to the absolute dry pulp. After being sprayed with lye in the cyclone separator, screwed and compressed, it is fully infiltrated and mixed with cotton linters, and then transferred to the catalytic reactor;

[0081] (3) Electrocatalytic reaction process: carried out i...

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Abstract

The invention relates to a production process of cotton pulp for cellulose triacetate, in particular to a simple production process of cotton pulp using cotton linter as a raw material; in the whole pulping process, the wastewater COD discharge is as low as 20250-25050mg / l, so that the environmental pollution and sewage treatment pressure can be reduced; on the conditions of stable polymerization, high whiteness and alpha cellulose content, uniform fiber length and proper compactness, the product has low content of methylene dichloride extract and metallic ions, low ash content and low dust, thus being applicable to the industry for producing cellulose triacetate.

Description

technical field [0001] The invention relates to a production process of cotton pulp, in particular to a production process of cotton pulp for manufacturing cellulose triacetate. Background technique [0002] my country is rich in cotton resources. Most domestic enterprises use cotton linters, a by-product of cotton processing, as raw materials. For example, in the textile field, cotton linters are used as raw materials to make cotton pulp, which is used in the viscose fiber industry. The added value is low, and in production, the COD discharge of wastewater is about 45000mg / l, which has the problem of polluting the environment. [0003] Due to its toughness, high tensile strength, high compressive strength, and good heat resistance, triacetate cellulose is an indispensable part of the production of polarizers for liquid crystal displays. With the rapid development of liquid crystal displays, triacetate fibers Su put forward higher requirements. The most important raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/22D21C3/02D21C9/14D21C9/16D21C9/00
Inventor 陈忠国曹知朋臧贻朋郑春友吕兴华王维林杨友强
Owner 山东银鹰化纤有限公司
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