Swlfate wood-pulp enzyme-method modifying process

Abstract

This invention relates to a modifying method with enzyme method to sulfate wood pulp, in which, enzyme is added into the sulfate wood pulp before beating, the proportion of enzyme and the pulp is 20-1000g / t, the density is 3-15%, temperature: 20-60deg.C, time: 0.5-4h, pH: 5.0-8.5.

Description

(1) Technical field [0001] The invention relates to a chemical wood pulp biological treatment technology, in particular to a method for enzymatic modification of kraft wood pulp, and belongs to the technical field of pulp and paper making. (2) Background technology [0002] Kraft pulping is the most common method for producing high-strength pulp. The high strength of kraft pulp is mainly due to kraft cooking, which preserves the fiber morphology and structure intact, and the fiber becomes soft, thus better retaining the single pulp. Root fiber strength, and give fibers a larger contact area, increasing the bonding force between fibers. However, the complete fiber morphology also brings difficulties to subsequent beating. Moreover, kraft cooking also makes lignin uniformly distributed in the fiber cell wall according to the thickness, which hinders the beating. The high degree of polymerization of primary wall carbohydrates in the cell wall and the LCC on the fiber surface m...

AI Technical Summary

Problems solved by technology

Regarding the effect of cellulase treatment on pulp strength, it is generally believed that as long as the appropriate reaction conditions are controlled, enzyme treatment will not cause a large change in physical strength, and excessive enzyme dosage and long reaction time will cause a significant increase in pulp strength. decline

[0006] Judging from the current research situation, although different biological enzymes treat the pulp, although the energy consumption of beating is reduced, most of them have a certain degree of damage to the strength of the pulp. In the papermaking process, it is necessary to add expensive chemicals to increase the paper strength Strength, the use of these chemicals has a limited effect on improving the strength of paper, and leads to the complexity of the wet end system. At the same time, it will have an adverse effect on the reuse of white water. Enzyme preparations that can improve pulp strength are of great significance to the beating of kraft pulp and the improvement of fiber properties