Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp

A viscose fiber and production method technology, applied in the field of viscose fiber manufacturing, can solve problems such as unstable product quality, large area of ​​reaction kettle, and uneven reduction of polymerization, so as to reduce process control points and eliminate uneven reaction , the effect of reducing the difficulty of control

Inactive Publication Date: 2011-05-04
YIBIN HIEST FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Uneven depolymerization: Due to the large volume of the reactor and many dead spots in the stirring, the stirring is uneven; and the addition of oxygen cannot evenly penetrate into the porridge to participate in the reaction, which eventually leads to uneven depolymerization;
[0008] 2. The reaction kettle occupies a large area, and requires compressed air and high temperature environment, which makes the whole viscose fiber produ

Method used

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  • Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp
  • Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp
  • Method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1

[0046] The specific process steps are as follows:

[0047] 1. Put the bamboo pulp and wood pulp with the average degree of polymerization greater than 1000 on the feeder, set a certain feeding rate (25kg / min), and then add the alkali with a concentration of 85g / l and a temperature of 60℃~90℃ Liquid, lye flow rate is 10m 3 / h~20m 3 , And then through stirring, the pulp is broken and fully mixed with lye to prepare a mixture of solid and liquid, which is called composite porridge. The process is called dipping.

[0048] Function: Make bamboo pulp and wood pulp raw materials into a solid and liquid mixture, dissolve β-cellulose at the same time, increase α-fiber content, and produce alkali cellulose.

[0049] Control parameters: lye temperature: 75±15℃ lye concentration: 85g / l

[0050] Concentration of compound porridge: 3.5±2% (mass percentage) Dipping time: 30±20min

[0051] Alternatively, the above wood pulp and bamboo pulp are respectively subjected to alkal...

Example Embodiment

[0062] Example 2

[0063] The specific process steps are as follows:

[0064] 1. Put the bamboo pulp and wood pulp with the average degree of polymerization greater than 800 on the feeder, set a certain feeding speed (25kg / min), and then add the alkali with a concentration of 80g / l and a temperature of 60℃~90℃ Liquid, lye flow rate is 10m 3 / h~20m 3 Its purpose is to accelerate the dissolution of lignin and impurities in bamboo pulp. Then through stirring, the pulp is crushed and thoroughly mixed with lye to prepare a mixture of solid and liquid, which is called composite porridge, and this process is called impregnation in the process.

[0065] Function: Make bamboo pulp and wood pulp raw materials into a solid and liquid mixture, which is called impregnation in the process, and at the same time dissolve β-cellulose, increase α-fiber content, and produce alkali cellulose.

[0066] Control parameters: lye temperature: 75±15℃ lye concentration: 80g / l

[0067] Concentration of...

Example Embodiment

[0079] Example 3

[0080] The specific process steps are as follows:

[0081] 1. Put the bamboo pulp and wood pulp with the average degree of polymerization greater than 1200 on the feeder, set a certain feeding speed (25kg / min), and then add the alkali with a concentration of 100g / l and a temperature of 60℃~90℃ Liquid, lye flow rate is 10m 3 / h~20m 3 , While adding the lye, add the auxiliary agent: methyl isoacetone (MIBK)-ethanol mixed solvent, where MIBK:ethanol=80:50, the purpose is to accelerate the dissolution of lignin and impurities in the bamboo pulp. Then through stirring, the pulp is crushed and thoroughly mixed with lye to prepare a mixture of solid and liquid, which is called composite porridge, and this process is called impregnation in the process.

[0082] Function: Make bamboo pulp and wood pulp raw materials into a mixture of solid and liquid, which is called impregnation in the process, and at the same time dissolve β-cellulose, increase α-fiber content, and produ...

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Abstract

The invention provides a method for preparing viscose fibers through ultrasonic depolymerization of bamboo and wood composite pulp, which is a method for producing the viscose fibers from bamboo and wood mixed slurry through depolymerization in an ultrasonic depolymerization tube. In the method, a traditional reaction kettle is replaced by the ultrasonic depolymerization tube, and the method comprises the following steps of: performing alkali steeping on the bamboo and wood pulp to obtain slurry; depolymerizing the slurry under the action of an ultrasonoscope; and pressing to obtain alkaline fibers, and finally preparing the viscose fibers from the alkaline fibers. The method overcomes the defects in the prior art, the depolymerization is more uniform, the energy consumption is low, a few pieces of equipment are used, the occupied space is small and the product quality is stable. Moreover, the ultrasonic polymer depolymerization is applied to the production of the viscose fibers for the first time, and a depolymerization method for the production of the viscose fibers through depolymerization is increased.

Description

technical field [0001] The invention belongs to the field of viscose fiber production, and relates to a method for producing viscose fiber with bamboo-wood composite pulp, in particular to a method for producing fiber viscose fiber with bamboo-wood composite pulp by applying an ultrasonic depolymerization method. technical background [0002] The depolymerization of cellulose (reducing the degree of polymerization) is an indispensable process step in the production of viscose. Only by reducing the depolymerization of plant cellulose to a certain extent can the production requirements of subsequent viscose fibers be met, and the uniformity of depolymerization in it And the degree of depolymerization is the key to depolymerization of cellulose. [0003] The reduction methods of cellulose for preparing viscose include: aerobic reduction and alkali reduction. In actual application, aerobic polymerization is the main method, while alkaline polymerization requires relatively high...

Claims

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Application Information

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IPC IPC(8): D01F2/06C08B1/08C08B9/00
Inventor 冯涛邓传东李蓉玲梁建军唐孝兵田启兵严青平胡小东施洋范怀熙
Owner YIBIN HIEST FIBER
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