Method for producing bamboo pomace

Abstract

The present invention provides a preparation method of bamboo pulp, belonging to the field of chemical fiber technology. Said method includes the following steps: obliquely cutting bamboo strip material into the form of horseshoe, the chip cross-section spacing distance is 20-40 mm, then prehydrolyzing the prepared bamboo strip, adding alkali and cooking, removing sand, making one-stage or two-stage bleaching treatment, making the bleached pulp material undergo the processes of acid treatment, concentration and pulping so as to obtain the invented bamboo pulp. Said bamboo pulp can be used for producing viscose fibre.

Description

technical field [0001] The invention relates to a preparation method of bamboo pulp, which belongs to the technical field of chemical fibers. Background technique [0002] As a raw material for the textile industry, chemical fibers are developing day by day, especially in today's increasingly scarce energy sources. The manufacture of chemical fibers is largely limited by coal and petroleum resources, so people have to turn their attention back to cellulose fibers in search of raw materials for making fibers. [0003] Bamboo has very rich resources in our country and is widely distributed. There are more than 40 genera and more than 400 varieties of bamboo. After planting and surviving, they can be cut down in 2-3 years. It is a fast-growing and high-yielding plant material. Taking the most widely used and better quality Cizhu as an example, its comprehensive cellulose content is 40-50%, lignin content is 20-30%, ash content is 1-3%, polypentose is 16-20%, fiber The average...

AI Technical Summary

Problems solved by technology

[0006] Due to the contradiction between the increase of whiteness and the decrease of polymerization degree in the bleaching process, the prior art generally adopts three-stage bleaching or four-stage bleaching to achieve certain effects.

[0007] However, the status of the prior art often has the problems of many steps, large consumption and serious pollution because of the above-mentioned pretreatment and bleaching processes. For a more representative technical solution, please refer to the disclosed "a kind of using bamboo material" in Chinese patent application CN1308160. The process of producing viscose fiber pulp", the technological process adopted is: material preparation→cutting→screening→washing→prehydrolysis→washing→cooking→dumping→washing→screening→thawing→sand removal→concentration→ Chlorination, washing → alkali refining, washing → bleaching, washing → acid treatment → washing → desanding → concentration → papermaking; after cooking, the content of Type A cellulose is ≥ 95.5%, and the hardness of the pulp (kapoise value) 4-10, the average degree of polymerization DP≥600; pulp whiteness after bleaching≥75%, the average degree of polymerization DP≥450, viscosity≥7.5mPa·s, cellulose content of class A≥93%

The production method of this technical solution is complicated, the process flow is long, the energy consumption is high, the pollution is serious, the quality control is difficult, the product quality fluctuates greatly, and it is difficult to meet the needs of actual production development.