Starch/polyethyleneimine mixture for papermaking

Abstract

The invention provides a starch / polyethyleneimine mixture for papermaking, wherein the starch / polyethyleneimine mixture for papermaking comprises the following components: 1-2% w / w of starch, 1-3% w / w of polyethyleneimine, and the balance water. A preparation method of the starch / polyethyleneimine mixture for papermaking comprises the following steps: 1) taking starch, adding polyethylenimine into a certain amount of starch, and preparing a starch suspension with distilled water; and 2) adding a small amount of NaOH, and gelatinizing for 10 min under the condition of the temperature of 90 DEG C, to obtain a starch / polyethyleneimine mixture paste liquid. The starch / polyethyleneimine mixture for papermaking has positive and negative charges balanced, can be used simultaneously with various additives, such as fluorescent whitening agents, anionic dispersed rosin gum and the like, and is suitable for papermaking production of all kinds of paper pulps.

Description

technical field [0001] The invention relates to a starch / polyethyleneimine mixture for papermaking, belonging to the technical field of papermaking. Background technique [0002] In recent years, with the rapid development of the national economy and the improvement of people's living standards, the production of paper and cardboard in my country has developed rapidly. In order to solve the shortage of forest resources and meet the demand for pulp in the development of papermaking, the recycling and utilization of waste paper has also achieved unprecedented development. However, when the waste paper is recycled, the plant fibers will gradually become keratinized, the swelling ability will be reduced, and the strength of the fibers and the bonding ability between fibers will decrease, resulting in the decline of the strength of the paper. When using recycled pulp to make paper, it is often used to add papermaking aids such as cationic starch to improve the water drainage spe...

AI Technical Summary

Problems solved by technology

[0003] The existing cationic starches for papermaking have the following disadvantages: 1) The self-charge of the modified starch affects the potential of the pulp, and there will be a positive charge phenomenon, thereby affecting the use effect; 2) The fibers and fillers have negative charges, and negative and positive charges They are attracted to each other by electrostatic attraction, resulting in flocculation, which affects the evenness and strength of the paper; 3) It cannot be used with anionic additives (such as fluorescent whitening agents, anion-dispersed rosin gum, anions, etc.) at the same time; 4) Some grass Pulp, waste paper pulp, ground wood pulp, there are many heteroanionic chemical substances, which will interfere with the application effect of cationic starch