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A post-treatment process of cotton and bamboo composite pulp

A technology of composite pulp and bamboo pulp, applied in pulp bleaching, non-woody plant/crop pulp, textiles and papermaking, etc., can solve problems such as difficulty in mass production, discomfort, poor product uniformity, etc., and achieve strong pertinence , easy to use, to overcome the effect of poor uniformity

Inactive Publication Date: 2014-10-22
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the poor uniformity of the products produced by the existing cotton linters, limited by the quality of the cotton linters, it is difficult to produce on a large scale, and the existing bleaching process is not suitable for the bleaching of cotton and wood composite pulp. According to the characteristics of the pulp itself, a post-treatment process for the production of viscose fiber pulp is proposed using the composite pulp of cotton linters and bamboo pulp as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Cotton linters and unbleached bamboo pulp as unbleached composite pulp

[0047] Among the selected cotton and bamboo composite pulp, cotton linters account for 99%, and bamboo pulp accounts for 1%.

[0048] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0049] The slurry concentration is controlled at 3% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid pool until the pH value is 3, and then enter the chlorination tower. The amount of chlorine gas is 0.6%, and the chlorination time is 0.5 hours. Pool, add caustic soda until the alkali content is the slurry volume ratio of 80g / m 3 ;

[0050] Enter the bleaching tank, heat up the steam to 65°C, stop the steam, add caustic soda to adjust the alkali, until the alkali content is 100g / m 3 , the amount of sodium hypochlorite used for bleachin...

Embodiment 2

[0065] Cotton linters and unbleached bamboo pulp as unbleached composite pulp

[0066] Among the selected cotton and bamboo composite pulp, cotton linters account for 85%, and bamboo pulp accounts for 15%.

[0067] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0068] The slurry concentration is controlled at 5% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid pool until the pH value is 3, and then enter the chlorination tower. Pool, add caustic soda until the alkali content is the slurry volume ratio 60g / m 3 ;

[0069] Enter the bleaching tank, heat up the steam to 3°C, stop the steam, add caustic soda to adjust the alkali, until the alkali content is 50g / m 3 , the amount of sodium hypochlorite used for bleaching is 0.7g / l, and the bleaching time is 18 minutes. Add hypochlorite according to...

Embodiment 3

[0084] Cotton linters and bleached bamboo pulp as unbleached composite pulp

[0085] Among the selected cotton and bamboo composite pulp, cotton linters account for 95%, and bamboo pulp accounts for 5%.

[0086] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0087] The concentration of the slurry is controlled at 3% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid tank until the pH value is 2, enter the chlorination tower, use 0.5% chlorine gas, and enter the alkalization after 1.5 hours of chlorination time. Pool, add caustic soda until the alkali content is the slurry volume ratio of 80g / m 3 ;

[0088] Enter the bleaching pool, heat up the steam to 30°C, stop the steam, add caustic soda to adjust the alkali, until the alkali content is 80g / m 3 , the amount of sodium hypochlorite used for b...

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Abstract

The invention provides a post-treatment process used for producing adhesive fiber pulp by taking composite pulp of cotton linter and bamboo pulp as raw materials, aiming at characteristics of cotton-bamboo composite pulp. The post-treatment process comprises the following technical steps of: chloridizing, bleaching, washing and manufacturing paper with pulp. According to the cotton-bamboo composite pulp disclosed by the invention, the cotton linter accounts for 70-99%, the bamboo pulp accounts for 1-30%, and the composite pulp has the following parameter indexes: alpha cellulose is greater than or equal to 91%, the polymerization degree is less than or equal to 1200, the ash content is greater than or equal to 0.13%, the whiteness is greater than or equal to 91%, the viscosity is less than or equal to 13, and the iron matter is less than or equal to 30 ppm, the pulp feeding concentration in the treatment process in the invention is 3-5%, the pulp is subjected to acid treatment in a pre-acidification pool, so that pH value is adjusted to 1-3, and then the pulp is fed into a chlorination tower, and the bleaching temperature is 30-65 DEG C. The whole technique process has the advantages of simple device and operation, convenience for use, high production efficiency and stable product quality.

Description

technical field [0001] The invention belongs to the post-treatment process link in the production process of denaturing composite pulp into viscose fiber pulp, and is especially suitable for the chlorination-bleaching-washing-papermaking post-processing technology of the composite pulp of cotton pulp and bamboo pulp field. Background technique [0002] Viscose fiber is a kind of commonly used chemical fiber, and its production process is as follows: pulping→preparation of spinning solution→spinning→post-processing→finished product, among which viscose pulp is obtained through pulping. Traditional viscose pulp is prepared from wood and cotton linters through a series of processes such as material selection, material preparation, physical processing or chemical pretreatment, cooking, bleaching, acid treatment, washing and papermaking. . [0003] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21C9/10D21C9/12D21F11/00
Inventor 薛勤徐发祥刘爱兵陈昌明谢鹏黄俊杨大平杨玉琴张兴全
Owner YIBIN GRACE GROUP CO LTD
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