Low-viscosity cotton pulp used for producing cellulose ether-esters and method for making the same

A low-viscosity, cotton pulp technology, applied in the field of low-viscosity cotton pulp for cellulose ether ester, can solve the problems of poor reactivity, high pollution, low methyl fiber content, etc., and achieve excellent cotton fiber performance and reactivity Good, the effect of high methyl fiber content

Inactive Publication Date: 2008-02-27
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cotton pulp products produced by people have low methylcellulose content, low whiteness, and low quality grades, which cannot meet the needs of the development of cellulose ether ester derivatives.
However, the production of cotton pulp still adopts the traditional high-temperature high-alkali cooking and sodium hypochlorite bleaching traditional production processes. The cotton pulp produced by these preparation methods has low cellulose content, low whiteness, and reaction The performance is poor, the quality grade is low, and the preparation method currently used by people to prepare cotton pulp has the disadvantages of high consumption, high pollution, and low production added value, which greatly affects the development of cellulose ether ester derivatives.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Select high-quality cotton linters with a maturity of ≥70%, no impurities in appearance, and no foreign fibers to prepare and screen to obtain cotton linters that meet the production conditions. The cotton linter content is 24.5%, the additives are sodium dodecylbenzene sulfonate relative to the dry cotton linter content 1.2%, hydrogen peroxide relative to the dry cotton linter content 1%, magnesium sulfate relative to the dry cotton linter content 0.3 %, sodium silicate is 0.1% relative to the absolute dry cotton linters, the liquid ratio is 1:3, the temperature is raised to 168°C within 50 minutes, and the temperature is kept for 250 minutes. Rinse the pulp, and then beat the cooked pulp in a beater, with a beating concentration of 5% to 10%, for 30 to 90 minutes until there are small lumps in the pulp; The slurry is desanded in the desander to remove impurities and fine fibers in the slurry; the slurry is chlorinated and bleached, using an effective chlorine content ...

Embodiment 2

[0014] The process steps adopted in this embodiment are consistent with those in Example 1, except that the amount of NaOH relative to dry cotton linters is 20.5% when cooking in the process, and the auxiliary agent adopts sodium dodecylbenzene sulfonate relative to dry cotton linters. 3% velvet amount, 2.5% hydrogen peroxide relative to the absolute dry cotton linter amount, 0.7% magnesium sulfate relative to the absolute dry cotton linter amount, 0.3% sodium silicate relative to the absolute dry cotton linter amount, and the liquid ratio is 1: 2. Raise the temperature to 150°C within 70 minutes and keep it warm for 380 minutes;

[0015] And when bleaching, then adopt the available chlorine amount of 3.5% relative to the absolute dry pulp amount, the slurry concentration can be at 2%, under the condition of temperature 48 ℃, pH value 10, carry out chlorination for 50 minutes.

[0016] The properties of the pulp obtained by adopting the above examples are: degree of polymeriza...

Embodiment 3

[0018] The process step adopted in this embodiment is consistent with that of Example 1, except that NaOH is 27% relative to the absolute dry cotton linters when cooking in the process, and the auxiliary agent is Pingping plus 5% of the relative absolute dry cotton linters, hydrogen peroxide 4.6% relative to the absolute dry cotton linters, 1% magnesium sulfate relative to the absolute dry cotton linters, 0.5% sodium silicate relative to the absolute dry cotton linters, the liquid ratio is 1:5, and the temperature rises to 170 within 50 minutes ℃, and keep warm for 120 minutes;

[0019] And when bleaching, then adopt the available chlorine amount relative to absolute dry pulp 5%, pulp concentration can be at 6%, under the condition of temperature 40 ℃, pH value 11, carry out chlorination for 50 minutes.

[0020] The properties of the pulp obtained by adopting the above examples are: degree of polymerization 230, 98.8% of cellulose A, ash content of 0.10%, iron content of 12ppm...

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Abstract

The present invention discloses a low-viscosity cotton pulp for producing cellulose ether ester and preparation method of said cotton pulp. Said invention uses cotton linters as raw material, and its preparation method includes the following steps: preparing material, digesting, washing material, beating, bleaching, removing sand, water-washing and pulp-making, etc.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a method for producing low-viscosity cotton pulp for producing cellulose ether ester by using cotton linters as a raw material and the cotton pulp. Background technique [0002] Cellulose ether ester derivatives are the earliest natural polymer materials discovered by humans. Because cellulose comes from nature, it has incomparable characteristics with other materials, such as good processability, excellent oil resistance, transparency, bright color, fullness, etc. . Solvent-based cellulose fiber is a brand-new environmentally friendly fiber developed in the 1990s abroad. Because of its renewable raw materials, excellent fiber performance, pollution-free production process, and natural degradation, it is known as the revolution of the 21st century. fibers and textile raw materials. Its excellent natural fiber and synthetic fiber characteristics make the product integrate the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/12
Inventor 田素峰刘建华李琳
Owner CHTC HELON
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