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A kind of cotton pulp and its preparation method and a kind of carboxymethyl cellulose and its preparation method

A technology of carboxymethyl cellulose and cotton pulp, applied in the field of materials, can solve the problems of low quality of cellulose ether derivatives, uneven polymerization degree of products, low reactivity of cotton pulp, etc. The effect of low volume and low consumption

Active Publication Date: 2017-12-15
ANHUI SNOW DRAGON FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, conventional cotton pulp is intermittently produced by steaming balls, and the cotton linters are turned by steaming balls in the steaming balls, and the degree of polymerization of the prepared products is not uniform
Moreover, the above-mentioned method for preparing cotton pulp has high cooking temperature (greater than 130° C.), long holding time (greater than 115 minutes), and the produced cotton pulp has low reactivity, and the quality of the prepared cellulose ether derivatives is low.

Method used

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  • A kind of cotton pulp and its preparation method and a kind of carboxymethyl cellulose and its preparation method
  • A kind of cotton pulp and its preparation method and a kind of carboxymethyl cellulose and its preparation method
  • A kind of cotton pulp and its preparation method and a kind of carboxymethyl cellulose and its preparation method

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preparation example Construction

[0022] The invention provides a kind of preparation method of cotton pulp, comprises the following steps:

[0023] The lye is mixed with the cotton linters after impurity removal, and after continuous cooking, washing, beating, first desanding, first concentration, chloralkaliization, bleaching, acid treatment, water washing, second desanding, second 2. concentrating and papermaking to obtain cotton pulp;

[0024] The mass ratio of the mass of the alkali in the lye to the dry weight of the cotton linters is (13~15):100;

[0025] The temperature of the continuous cooking is 108-115° C., and the time of the continuous cooking is 55-65 minutes.

[0026] In the present invention, cotton linters are selected as raw materials for preparing cotton pulp. In the present invention, cotton linters with maturity ≥ 72%, sulfuric acid insoluble matter ≤ 3.0%, and ash content ≤ 1.5% are preferably used.

[0027] Before the cotton pulp is prepared, the cotton linters are firstly cleaned of ...

Embodiment 1

[0056] Cotton linters with high maturity, low sulfur value, and low ash content are selected, and the indicators are 72% maturity, 2.8% S value, and 1.5% ash content.

[0057] The above-mentioned cotton linters are subjected to dry impurity removal to remove cotton seeds, cotton husks, dust, etc., to obtain the impurity-removed cotton linters.

[0058] The cotton linters after impurity removal are mixed with NaOH solution, pre-soaked, and screw-pressed into the tubular continuous digester. The amount of NaOH added (relative to the dry weight of linters) is 15.0 wt%, and the liquor ratio is 1:3.2. Add sodium dodecylsulfonate and sodium silicate to the tubular continuous digester. Wherein, the addition amount of sodium dodecylsulfonate is (relative to the absolute dry weight of cotton linters) 0.8wt%, and the addition amount of sodium silicate is (relative to the absolute dry weight of cotton linters) 0.9wt%. After the materials were added, the materials were continuously cook...

Embodiment 2

[0086]Cotton linters with high maturity, low sulfur value, and low ash content are selected, and the indicators are respectively 74% maturity, 2.8% S value, and 1.2% ash content.

[0087] The above-mentioned cotton linters are subjected to dry impurity removal to remove cotton seeds, cotton husks, dust, etc., to obtain the impurity-removed cotton linters.

[0088] The cotton linters after impurity removal are mixed with NaOH solution, pre-soaked, and screw-pressed into the tubular continuous digester. The amount of NaOH added (relative to the dry weight of linters) is 14.0%, and the liquor ratio is 1:3.3. Add sodium dodecylsulfonate and sodium silicate to the tubular continuous digester. Wherein, the addition amount of sodium dodecylsulfonate is (relative to the absolute dry weight of cotton linters) 0.75wt%, and the addition amount of sodium silicate is (relative to the absolute dry weight of cotton linters) 0.9wt%. After the materials were added, the materials were continu...

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Abstract

The invention provides a preparation method of cotton pulp. The method comprises the following steps: mixing alkali liquor and cotton linters subjected to impurity removal, and performing continuous boiling, washing, pulping, degritting, primary concentration, chlorine alkalization, bleaching, acid treatment, water washing, degritting, secondary concentration and papermaking, so as to obtain the cotton pulp. The mass ratio of alkali in the alkali liquor to the absolute-dry cotton linters is (13 to 15): 100; the temperature for continuous boiling is 108 to 115 DEG C; the period for continuous boiling is 55 to 65min. According to the method, cotton pulp is prepared through a high alkali content, low temperature and short time continuous coiling mode, materials are uniformly heated in a tube, uniform permeation of alkali liquor is achieved, and the product polymerization degree is uniform; cotton fiber primary walls and secondary walls can be destroyed furthest, so that the degree of crystallinity of cotton pulp fiber is reduced, the amorphous region rises, and the reaction activity of the cotton pulp is improved. Through the adoption of the cotton pulp with high reaction activity, high-quality carboxymethylcellulose can be prepared.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a cotton pulp and a preparation method thereof, and a carboxymethyl cellulose and a preparation method thereof. Background technique [0002] Cotton pulp is the main raw material for the production of cellulose ether derivatives. Cotton pulp with high purity, good uniformity of polymerization degree and high reactivity is a necessary condition for the production of high-quality cellulose. [0003] At present, conventional cotton pulp is intermittently produced by steaming balls, and the cotton linters are turned in the steaming balls by rotating the steaming balls, and the degree of polymerization of the prepared products is not uniform. Moreover, the above-mentioned method for preparing cotton pulp has a high cooking temperature (greater than 130° C.) and a long holding time (greater than 115 minutes), the produced cotton pulp has low reactivity, and the quality o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21C3/02C08B11/12
CPCC08B11/12D21C3/02D21H11/12
Inventor 陶振家吴宝杰陈凯柴靖
Owner ANHUI SNOW DRAGON FIBER TECH
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