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Method for preparing cellulose mixture pulp

A technology of mixing pulp and cellulose, which is applied in the field of cellulose fiber production, can solve problems such as large fluctuations, affecting the color uniformity of textile products, and increasing the chroma of cellulose mixed pulp, achieving small fluctuations, reducing material consumption, and whiteness high value effect

Inactive Publication Date: 2019-11-01
TIANE CHEM FIBER GROUP CORP BAODING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This concentration of sodium hydroxide will increase the chroma of the concentrated solvent NMMO and cellulose mixed pulp, and the whiteness of the final product fiber is 75%-79%, and the fluctuation is large, which will affect the color uniformity of textile products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 A kind of preparation method of cellulose mixed pulp

[0021] Include the following steps:

[0022] (1) Add 2% sodium hydroxide solution to the concentrated solvent NMMO.

[0023] (2) Control the concentration of sodium hydroxide in the concentrated solvent by controlling the flow rate of sodium hydroxide solution. The sodium hydroxide solution flow rate is 20kg / h. The concentration of sodium hydroxide in the concentrated solvent NMMO is 0.02g / L.

[0024] (3) The concentrated solvent NMMO and sodium hydroxide solution are fully mixed through a static mixer and then enter the concentrated solvent storage tank.

[0025] (4) The concentrated solvent NMMO and the pressed wet pulp are stirred, mixed and heated in the mixing storage tank. Control the liquid level of cellulose mixed pulp in the mixing storage tank to 85%, and prolong the time for full mixing of materials.

[0026] Through the above preparation method of cellulose mixed pulp, the chromaticity ...

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PUM

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Abstract

The invention provides a method for preparing cellulose mixture pulp in a solvent type cellulosic fiber production process. The method includes adding a trace amount of a sodium hydroxide solution into thick solvent NMMO; then stirring and mixing the mixture with cellulose in a mixing storage tank, and heating the mixture to prepare the cellulose mixture pulp. The cellulose mixture pulp has chromagreatly reduced than chroma of pulp in the prior art and stable in value, and improves the whiteness value of a final fiber product. The method ensures thick solvent stability, achieves a stable state of a three-phase mixture containing cellulose, NMMO and water, reduces chroma of the thick solvent and the cellulose mixture pulp, and allows the whiteness value of the final fiber product to be 82%or above and to be stable, thus improving application performance of fibers and reducing the chroma of textile products.

Description

technical field [0001] The invention relates to a method for preparing cellulose mixed pulp during the production process of solvent-based cellulose fibers, and belongs to the technical field of cellulose fiber production. Background technique [0002] Solvent method cellulose fiber—Lyocell fiber is a regenerated cellulose fiber prepared by directly dissolving cellulose in NMMO / water system to prepare cellulose / NMMO glue, and spinning it by dry spray wet method. The NMMO solvent used in Lyocell fiber production is non-toxic and can be recycled and reused. The entire production system forms a closed-loop recovery and recycling system without waste discharge, realizing the clean production of regenerated cellulose fibers. [0003] The production process of solvent-based cellulose cellulose fiber is pulp → pulp porridge preparation → mixed pulp preparation (cellulose suspension) → cellulose dissolution → cellulose / NMMO glue → filtration, defoaming → spinning → tow → washing →c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08J3/02
CPCC08J3/02C08J2301/02
Inventor 蒋志君高殿才杜树新路喜英张红立闫丽娜田文智
Owner TIANE CHEM FIBER GROUP CORP BAODING