Bamboo alpha-pulp for viscose and production method thereof

Abstract

The invention discloses a bamboo alpha-pulp for viscose and a production method thereof. Main quality indexes of a bamboo pulp finished product are that: the degree of polymerization is 500 to 600 DP, alpha cellulose is more than or equal to 92 percent, ash is less than or equal to 0.20 percent, iron is less than or equal to 30 ppm, and the reaction performance is less than or equal to 200s. The production method comprises the following steps: preparing materials, stewing, bleaching, acidating and pulping. The stewing method adopts two-time different processes. The primary stewing adopts a sulfate method and the secondary stewing adopts a pure caustic soda method. The primary stewing can effectively dissolve the lignin in bamboo chips, remove the alkaline lignin and alkali soluble impurities through multistage washing, and reduce the pollution. The secondary stewing further removes hemicellulose and residual lignin, purifies the alpha cellulose, and guarantees that the reaction performance of the bamboo alpha-pulp can totally pass. The production method greatly improves the content of the alpha cellulose and reaction performance passing speed of the bamboo alpha-pulp, reduces the discharge of the stewing waste liquor, and provides a basis for further improving the yield and quality of bamboo fibers in chemical fiber production.

Description

technical field [0001] The invention relates to a bamboo pulp made from bamboo and a manufacturing method thereof, in particular to a bamboo pulp for viscose and a manufacturing method thereof. Background technique [0002] The traditional regenerated fibers are pulped from coniferous wood and cotton linters and then made into fibers by the "viscose method". Due to the lack of forest resources and limited cotton fields in my country, the development scale of traditional natural fibers is limited, and the production of viscose fibers from cotton pulp and wood pulp is restricted. Therefore, people gradually shift their attention to the development and utilization of new natural fibers, and it has become a development trend to seek new raw materials for regenerated fibers. The fiber content of bamboo reaches about 40-50%, which is a better natural fiber raw material. my country's bamboo resources account for nearly a quarter of the world's bamboo resources, and it is the larg...

AI Technical Summary

Problems solved by technology

"Although the bamboo pulp made by the above two methods can be used for viscose fiber, although the process of boiling + caustic soda is simple, the content of the first fiber in the bamboo pulp is only 79-91.2%, indicating that the fiber purity reaches If the fiber content of cotton pulp and wood pulp is less than the standard, it is not conducive to the quality control of downstream viscose production and increases consumption. Moreover, due to the high content of semi-fiber and other impurities, the reactivity of bamboo pulp cannot pass. In the viscose production process It is difficult to make rubber in the middle, and the rate of waste rubber increases. Only by mixing bamboo pulp, cotton pulp, and wood pulp can the production be ensured, which affects the purity of bamboo pulp fibers and is not conducive to bamboo pulp replacing cotton and wood pulp. large-scale production of bamboo pulp