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Preparation method of refine cotton

A technology for refining cotton and cotton pulp, applied in textile and papermaking, pulp bleaching, fiber raw material processing, etc., can solve the problems of high maturity, product whiteness not meeting demand, difficult process control, etc., to achieve low water consumption 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

[0021] The present invention is carried out according to the following steps:

[0022] 1) material selection, cotton opening, cooking: take cotton linters as raw material and add cooking liquid after cotton opening and impurity removal, and cook at 120 ° C; wherein, in the cooking liquid, KOH content is 18g / l, and the weight percent of emulsifier is 0.1%, the emulsifier is sodium alkyl benzene sulfonate; the material-to-liquid weight ratio is 1:5 during cooking;

[0023] 2) Pre-bleaching: the absorbent cotton after cooking is washed with water to obtain cotton pulp, and then H2O2 and acetone peroxide mixed solution are added for pre-bleaching;

[0024] 3) Acidification: the cotton pulp after pre-bleaching is acidified for 2h under the condition of pH 6;

[0025] 4) Bleaching: add a mixed solution of H2O2 and chlorine dioxide between 30-50 degrees, the amount of the mixed solution is 4% of the quality of the refined cotton, and it is made by stirring for 12 minutes.

[0026] ...

Embodiment 2

[0033] The present invention is carried out according to the following steps:

[0034] 1) material selection, cotton opening, cooking: take cotton linters as raw material and add cooking liquid after cotton opening and impurity removal, and cook at 100 ° C; wherein, in the cooking liquid, KOH content is 16g / l, and the weight percent of emulsifier is 0.1%, the emulsifier is sodium alkyl benzene sulfonate; the material-to-liquid weight ratio is 1:6 during cooking;

[0035] 2) Pre-bleaching: the absorbent cotton after cooking is washed with water to obtain cotton pulp, and then H2O2 and acetone peroxide mixed solution are added for pre-bleaching;

[0036] 3) Acidification: the cotton pulp after pre-bleaching is acidified under the condition of pH 4 for 1-2h;

[0037] 4) Bleaching: add a mixed solution of H2O2 and chlorine dioxide between 45 degrees, the amount of the mixed solution is 5% of the quality of the refined cotton, and it is made by stirring for 15 minutes.

[0038] I...

Embodiment 3

[0045] The present invention is carried out according to the following steps:

[0046] 1) material selection, cotton opening, cooking: take cotton linters as raw material and add cooking liquid after cotton opening and impurity removal, and cook at 115 DEG C; wherein, in the cooking liquid, KOH content is 15g / l, and the weight percent of emulsifier is 0.25%, the emulsifier is sodium alkyl benzene sulfonate; the material-liquid weight ratio is 1:5 during cooking;

[0047] 2) Pre-bleaching: the absorbent cotton after cooking is washed with water to obtain cotton pulp, and then H2O2 and acetone peroxide mixed solution are added for pre-bleaching;

[0048] 3) Acidification: the cotton pulp after pre-bleaching is acidified under the condition of pH 6 for 1-2h;

[0049] 4) Bleaching: add a mixed solution of H2O2 and chlorine dioxide between 40 degrees, the amount of the mixed solution is 4% of the quality of the refined cotton, and it is made by stirring for 10 minutes.

[0050] I...

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PUM

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Abstract

The invention relates to a preparation method of refine cotton. The preparation method creatively selects a secondary bleaching mode, a bleaching agent employ a mixed solution of H2O2, chlorine dioxide, and actetone peroxide, low boiling temperature is employed, boiling time is short, a refine cotton product with viscosity being greater than 1700 mPa.s is produced, the ultrahigh-viscosity refine cotton product with whiteness being greater than 80% is produced, and the requirement of ultrahigh-viscosity product can be satisfied for cellulose ether and cellulose esters manufacturers. A main bleaching process is low-concentration two-segment bleaching, pre-bleaching liquid is completely recovered, hydrogen peroxide bleaching is friendly to environment, and no poisonous and harmful substance is generated in waste water. During a bleaching process, cotton carding can be employed for recovering the water, and the water consumption of the unit product is low.

Description

technical field [0001] The invention relates to a preparation method of refined cotton, and belongs to the technical field of refined cotton manufacturing. Background technique [0002] When cellulose ether and cellulose ester manufacturers produce high-viscosity products, they always require that the higher the viscosity of the raw material, the refined cotton, achieves a certain degree of whiteness, the better to meet their requirements for producing high-viscosity products. The traditional production of refined cotton generally adopts the following processes: 1) cotton linters are opened; 2) high-pressure cooking: adding cotton linters into a cooking pot, adding lye to heat up and cooking; 3) washing: cooking the cooked cotton linters Washing; 4) Pretreatment before bleaching; 5) Bleaching; 6) Rolling and drying to obtain finished products. [0003] The process method can produce refined cotton products with a viscosity greater than 800 mPa·s. Its shortcomings are: the ...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C9/14D21C9/16
CPCD21C5/00D21C9/14D21C9/16
Inventor 杨涛
Owner YANGZHOU ZHONGFU BIOTECH CO LTD
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