Blanching method capable of improving strength of bamboo pulp fiber

Abstract

The invention relates to the technical field of papermaking pulping, in particular to a blanching method capable of improving strength of bamboo pulp fiber. Damage to lignin and cellulose is reduced by reducing the blanching temperature of an EOP section and reducing the severity of a reaction, meanwhile, the temperature, pH value and the dosage of a chlorine dioxide blanching agent in the anterior and posterior blanching process of the EOP section are controlled for optimization of comprehensive reaction conditions, finally, whitening enzyme in the model of BUZYME3500, which is produced by the Bachmann Company, is selected for enzyme treatment of bamboo pulp, damage of the EOP section to bamboo pulp fiber can be reduced finally under the synergistic action, the strength of the bamboo pulpfiber is greatly improved, the whitening degree of the bamboo pulp cannot be affected, the whitening degree of the prepared bamboo pulp reaches 85-87 degrees, no yellowing phenomenon can be caused after stabilization, and the tearing strength and the fracture resistance of paper prepared from the bamboo pulp can be improved by 5% or above.

Description

technical field [0001] The invention relates to the technical field of papermaking and pulping, in particular to a bleaching method for improving the strength of bamboo pulp fibers. Background technique [0002] The traditional bleaching process of bamboo dissolving pulp is a chlorine-containing C~E~H (C~chlorine, E~alkali extraction, H~hypochlorite) three-stage bleaching process. Since CEH three-stage bleaching uses a large amount of chlorine Bleaching agents, mainly chlorine and hypochlorite, will produce more than 40 kinds of organic chlorides (AOX) such as chloroform and dioxin during the bleaching process. These toxic substances are not only carcinogenic, teratogenic, toxic and difficult to handle , pose a serious threat to the ecological environment and human health. As an improvement, the prior art uses chlorine dioxide (ClO 2 ) to replace chlorine bleaching to reduce the content of chlorinated organic compounds in bleaching wastewater, that is, chlorine-free ECF th...

AI Technical Summary

Problems solved by technology

However, the second stage bleaching (EOP stage) in the ECF three-stage bleaching is to use caustic soda, hydrogen peroxide and oxygen to bleach. This stage has a strong reaction with the lignin and cellulose in the bamboo pulp due to the hydrogen peroxide and other bleaching agents. The damage of the fiber is very large, and then the strength of the prepared bamboo pulp fiber is poor

However, due to the severity of the reaction in the EOP section, it is affected by factors such as the reaction temperature, the amount of bleaching agent, and the pH. degree, so that the whiteness of the prepared bamboo pulp cannot meet the requirements