Cotton pulp with high degree of polymerization and production method thereof

A production method and technology with high degree of polymerization, applied in pulp bleaching, pulping with inorganic alkali, pulping with cellulose raw materials, etc., can solve the problems of unsuitable production and processing, low temperature and high ash content

Inactive Publication Date: 2012-03-21
ANHUI SNOW DRAGON FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts two-stage cooking to produce cotton pulp, the temperature is low, and the degree of damage to the cellulose macromolecular chain in the cotton linters is low, thereby improving the degree of polymerization of the obtained cotton pulp, but its ash content is high, so it is not applicable For the production and processing of products with strict requirements on metal ions, such as liquid crystal film, etc.

Method used

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  • Cotton pulp with high degree of polymerization and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] First, cotton linter raw materials with no three-filament and a maturity of 75% are opened and dry-type impurity removal to obtain fine-dried cotton linters. Among them, 70wt% of the cotton linter raw materials used are Type II cotton linters, 30wt % is Type III cotton linters;

[0065] The sodium hydroxide of 9.0wt% sodium hydroxide, the sodium tripolyphosphate of 1.1wt%, the JFC of 0.3wt% and the sodium sulfite of 0.2wt% that consumption is fine-dried cotton linters dry weight are formulated into cooking liquid at 60 ℃, and liquid ratio is 1:4.1, fully mixed with fine-dried cotton linters by cyclone separator spraying, and then squeezed by a screw press, then screw conveyed to steaming balls, in the steaming balls, fine-dried cotton linters and cooking liquid are mixed at room temperature for 40 minutes Carry out cooking, heat up to 108°C within 50 minutes, deflate for 15 minutes, then continue to heat up to 128°C within 30 minutes, and keep warm for 110 minutes;

[...

Embodiment 2

[0070] Firstly, cotton linter raw materials with no three-filament and a maturity of 71% are opened and dry-type impurity removal to obtain fine-dried cotton linters. Among them, 60wt% of the cotton linter raw materials used are Type II cotton linters, 40wt % is Type III cotton linters;

[0071] The sodium hydroxide of 9.1wt% sodium hydroxide, the sodium tripolyphosphate of 1.2wt%, the JFC of 0.3wt% and the sodium sulfite of 0.2wt% are formulated into cooking liquid at 60 ℃ with consumption being the dry weight of fine-dried cotton linters, and the liquid ratio is 1:4.2, fully mixed with fine-dried cotton linters by cyclone separator spraying, and then squeezed by a screw press, and then screwed to the steaming ball. After mixing for 40 minutes, heat up to 108°C within 50 minutes, deflate for 15 minutes, then continue to heat up to 126°C within 30 minutes, and keep warm for 110 minutes;

[0072] After cooking is finished, obtain the slurry after cooking, follow-up technologic...

Embodiment 3

[0075] First, cotton linter raw materials with no three-filament and a maturity of 76% are opened and dry-type impurity removal to obtain fine-dried cotton linters. Among them, 55wt% of the cotton linter raw materials used are Type II cotton linters, 45wt % is Type III cotton linters;

[0076] The sodium hydroxide of 9.1wt% sodium hydroxide, the sodium tripolyphosphate of 1.5wt%, the JFC of 0.3wt% and the sodium sulfite of 0.2wt% that consumption is fine-dried cotton linters dry weight are formulated into cooking liquid at 60 ℃, and liquid ratio is 1:4.2, sprayed by cyclone separator and fully mixed with fine dry cotton linters, and then squeezed by screw press, then screw conveyed to steaming balls;

[0077] The subsequent process flow is the same as that of Example 2, with only slight differences in process parameters. In this example, the acid concentration of the acid treatment is 1.3 g / L.

[0078] The quality of the obtained high-polymerization degree cotton pulp was tes...

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Abstract

The invention relates to the technical field of cotton pulp, in particular to cotton pulp with a high degree of polymerization and a production method thereof. The production method comprises the following steps: carrying out breaking and opening as well as decontamination to cotton linter material to obtain high-quality cotton linter; mixing the high-quality cotton linter with cooking liquor and then cooking the mixture to obtain a sizing agent, wherein the cooking liquor contains alkali and tripolyphosphate; and carrying out bleaching, acid treatment and paper manufacture with pulp to the sizing agent to obtain the cotton pulp with a high degree of polymerization. With the production method provided by the invention, the cotton pulp with low ash content and high transparency is obtained, and the production method is applicable to production and processing of products with stricter requirements on metal ions. The invention also provides the cotton pulp with a high degree of polymerization of 23000-2700, the content of alpha cellulose of more than or equal to 99 weight percent, whiteness is more than or equal to 80 percent, ash content is less than or equal to 0.04 weight percent, and transparency is more than or equal to 80 percent.

Description

technical field [0001] The invention relates to the technical field of cotton pulp, in particular to a cotton pulp with a high degree of polymerization and a production method thereof. Background technique [0002] Cotton pulp is an important raw material for the production of chemical products such as pulp and viscose fiber, such as carboxymethyl cellulose and other cellulose ether products that can be widely used in the fields of food, medicine and hygiene, and daily chemical industry. Among them, the high degree of polymerization Cotton pulp is mainly used to produce cellulose ether products with a high degree of polymerization. Therefore, it is of great significance to improve the quality of cotton pulp with a high degree of polymerization. [0003] At present, the prior art discloses various production methods of cotton pulp with a high degree of polymerization, such as the Chinese patent document whose publication number is CN101130886A discloses a method for preparing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21C3/02D21C3/22D21C9/14
Inventor 陶振家吴保杰谢文琦常寿
Owner ANHUI SNOW DRAGON FIBER TECH
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