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Preparation method of refined cotton used for production of cellulose ether powder

A technology of cellulose ether and refined cotton, which is used in fiber raw material processing, textile and papermaking, pulp bleaching, etc., can solve problems such as high maturity, difficult process control, and product whiteness that cannot meet demand, and achieves water consumption. low effect

Inactive Publication Date: 2018-05-29
YANGZHOU ZHONGFU BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are: the maturity of the selected cotton linters is high, requiring more than 80%, and it is difficult for ordinary cotton linters to reach such a high maturity; cooking is completed through two-stage cooking, and the process is not easy to control; The whiteness cannot meet the demand, especially in cosmetics, medicine and other product systems that require higher whiteness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present invention is carried out according to the following steps: 1) material selection, cotton opening, and cooking: take cotton linters as raw material, add cooking liquid after opening and removing impurities, and cook at 122°C; wherein, the KOH content in the cooking liquid is 16g / l , the weight percent of emulsifier is 0.18%; The emulsifier is sodium alkylbenzene sulfonate, and the weight ratio of material to liquid is 1:5 during cooking;

[0023] 2) Pre-bleaching: washing the degreased cotton after cooking, adding water to obtain cotton slurry, adjusting to pH=9, and then adding sodium hypochlorite for pre-bleaching;

[0024] 3) Acidification: the pre-bleached cotton pulp was acidified at pH 5 for 1.8h.

[0025] 4) Add H2O2 solution between 45 degrees, the amount of H2O2 added is 1.5% of the mass of refined cotton, and it is made by stirring for 35 minutes.

[0026] The H2O2 mass concentration is 0.9wt%, and the bleaching temperature is 18°C.

[0027] Chlor...

Embodiment 2

[0033] The present invention is carried out according to the following steps: 1) material selection, cotton opening, and cooking: use cotton linters as raw material, add cooking liquid after opening and removing impurities, and cook at 110°C; wherein, the KOH content in the cooking liquid is 15g / l , the weight percent of emulsifier is 0.25%; Described emulsifier is sodium alkylbenzene sulfonate; The weight ratio of material to liquid is 1: 6 during cooking;

[0034] 2) Pre-bleaching: washing the degreased cotton after cooking, adding water to obtain cotton slurry, adjusting to pH=9, and then adding sodium hypochlorite for pre-bleaching;

[0035] 3) Acidification: the pre-bleached cotton pulp was acidified at pH 6 for 1 h.

[0036] 4) Add H2O2 solution between 50 degrees, the amount of H2O2 added is 1.2% of the mass of refined cotton, and it is made by stirring for 25 minutes.

[0037] The H2O2 mass concentration is 0.6wt%, and the bleaching temperature is 15°C.

[0038] Chlo...

Embodiment 3

[0044] The present invention is carried out according to the following steps: 1) material selection, cotton opening, and cooking: use cotton linters as raw material, add cooking liquid after opening and removing impurities, and cook at 130°C; wherein, the KOH content in the cooking liquid is 20g / l , the weight percent of emulsifier is 0.25%; Described emulsifier is sodium alkylbenzene sulfonate; The weight ratio of material to liquid is 1: 4 during cooking;

[0045] 2) Pre-bleaching: washing the degreased cotton after cooking, adding water to obtain cotton slurry, adjusting to pH=8, and then adding sodium hypochlorite for pre-bleaching;

[0046] 3) Acidification: the pre-bleached cotton pulp was acidified for 1.7h under the condition of pH 5.5.

[0047] 4) Add H2O2 solution between 50 degrees, the amount of H2O2 added is 1% of the quality of refined cotton, and it is made by stirring for 35 minutes.

[0048] The H2O2 mass concentration is 0.6wt%, and the bleaching temperature...

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Abstract

The invention relates to a preparation method of refined cotton used for production of cellulose ether powder. The method comprises the following steps: selecting cotton velvet as a raw material, performing steps of cotton opening, boiling and neutralizing, adding a H2O2 solution at the temperature of 45-50 DEG C, wherein the addition amount of H2O2 accounts for 1-2% of mass of the refined cotton,and stirring the material for 20-40 min to obtain the product. After neutralizing, a mixed solution of H2O2, chlorine dioxide, and actetone peroxide is taken as a bleaching agent, through practical detection, the whiteness of the final product can be increased, reduction of product viscosity is limited, and the molecular weight of the final product cannot be influenced.

Description

technical field [0001] The invention relates to a method for preparing refined cotton used in the production of cellulose ether powder, and belongs to the technical field of refined cotton production. Background technique [0002] When cellulose ether and cellulose ester manufacturers produce high-viscosity products, they always require that the raw material—refined cotton—reach a certain degree of whiteness, and the higher the viscosity, the better, so as to meet their requirements for producing high-viscosity products. Traditional refined cotton production generally adopts the following processes: 1) Cotton linters are opened; 2) High-pressure cooking: add cotton linters to the cooking pot, add lye to heat up and cook; 3) Washing: Cook the cotton linters washing; 4) pretreatment before bleaching; 5) bleaching; 6) rolling and drying to obtain the finished product. [0003] The process can produce refined cotton products with a viscosity greater than 800mPa·s. Its shortcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/14
CPCD21C5/00D21C9/14
Inventor 杨涛
Owner YANGZHOU ZHONGFU BIOTECH CO LTD
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