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Cellulose acetate prepared by taking cotton linter pulp as raw material and preparation method and application thereof

A technology of cellulose acetate and cotton linter pulp, which is applied in the field of cellulose acetate made from cotton linter pulp and its manufacture and application, and can solve the problem of high crystallinity of cotton linter pulp and difficult acetylation process. Control, low production efficiency and other issues, to achieve the effect of good product quality, simple manufacturing method, and easy operation

Inactive Publication Date: 2009-09-30
NANTONG CELLULOSE FIBERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is technically difficult to prepare cellulose acetate from cotton linter pulp, mainly due to the high crystallinity of cotton linter pulp, difficulty in controlling the acetylation process, and low production efficiency.

Method used

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  • Cellulose acetate prepared by taking cotton linter pulp as raw material and preparation method and application thereof
  • Cellulose acetate prepared by taking cotton linter pulp as raw material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using cotton linter pulp with 85.6% R-10 and a viscosity of 5.7dl / g as raw material, cellulose acetate was prepared through the following process:

[0043] (1) Cotton linter pulp crushing: the plate-shaped cotton linter pulp finished product is crushed into a fluffy appearance through a grinder.

[0044] (2) Activation: Spray acetic acid on the pulverized cotton linter pulp. The consumption of acetic acid is 80% of cotton linter pulp weight, and the temperature of activation is 25 ℃, and activation time is 100 minutes.

[0045] (3) acetylation: taking the cotton linter pulp weight as a benchmark, 300% acetic acid, 18% sulfuric acid, 200% acetic anhydride and cotton linter pulp are added in the esterification reactor, and the initial temperature of the reaction is from Starting at -10°C, the temperature rise rate was controlled at 1°C / min, and the acetylation reaction time was 80 minutes.

[0046] (4) Hydrolysis: a magnesium acetate aqueous solution with a mass concent...

Embodiment 2

[0052] Using cotton linter pulp with 99.1% R-10 and a viscosity of 8.2dl / g as raw material, cellulose acetate was prepared through the following process:

[0053] (1) Cotton linter pulp crushing: the flocculent cotton linter pulp finished product is crushed into a fluffy appearance through a grinder.

[0054] (2) Activation: Spray acetic acid on the pulverized cotton linter pulp. The consumption of acetic acid is 18% of cotton linter pulp weight, and the temperature of activation is 30 ℃, and activation time is 50 minutes.

[0055] (3) acetylation: taking the cotton linter pulp weight as a basis, 300% acetic acid, 8% sulfuric acid, 220% acetic anhydride and cotton linter pulp are added in the esterification reactor, and the initial temperature of the reaction is from Starting at 0°C, the temperature rise rate was controlled at 0.85°C / min, and the acetylation reaction time was 96 minutes.

[0056] (4) Hydrolysis: use a magnesium acetate aqueous solution with a mass concentrat...

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Abstract

The invention discloses cellulose acetate prepared by taking cotton linter pulp as the raw material and a preparation method and an application thereof. The cellulose acetate is prepared by pulverizing, activating, acetylizing, hydrolyzing, precipitating, rinsing and drying the cotton linter pulp which is used as the raw material. The cellulose acetate is used for manufacturing textile cellulose acetate filaments, membranes, semipermeable membranes, photosensitive films and other materials. The cellulose acetate is prepared by taking cotton linter pulp as the raw material which is easy to obtain, and the preparation method of the cellulose acetate is easy to operate and ensures good product quality.

Description

Technical field: [0001] The invention relates to cellulose acetate prepared by using cotton linter pulp as a raw material, its production method and application. Background technique: [0002] At present, the pulp raw material for synthesizing cellulose acetate generally comes from wood pulp. Due to the limitation of forestry resources, the processing cost of wood pulp is high, and the problem of environmental pollution is serious, many manufacturers in the world have closed down the factories of esterified wood pulp. Due to the shortage of wood pulp supply, the raw materials for the synthesis of cellulose acetate in my country mainly rely on imports, which largely limits the development of the domestic cellulose acetate industry. [0003] China is the world's largest producer of cotton linter pulp, with abundant resources. The domestic output of dissolving cotton pulp has reached 800,000 tons, most of which are only used to produce low-grade products such as viscose fibers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/06
Inventor 张杰马晓龙乐保祥沈琳曹建华梁银春陈昀崔磊
Owner NANTONG CELLULOSE FIBERS CO LTD
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