Preparation method of starch-based fixing agent

Abstract

The invention relates to a preparation method of a starch-based fixing agent, and belongs to the technical field of fixing agents. According to the invention, acrylamide and polyethyleneimine are blended and crosslinked; in a gluing process, the granular structure of starch is damaged, so that starch aggregates are swelled, and starch molecules are promoted to be hydrated and dissolved; and the starch molecules and the cross-linked substance both contain hydroxyl groups, so that hydrogen bonds can be formed between the starch molecules and the cross-linked substance and play a role in graftingbetween the starch molecules and the cross-linked substance, and the prepared starch-based fixing agent has the advantages of better cohesiveness, flowability, freezing resistance and the like; branched chains which are flexible and have a good effect with plant fibers are introduced into a rigid starch molecular structure, so that the prepared starch-based fixing agent not only has cationic groups, but also has more groups which are easier to interact with the fibers, and the enhancement effect of the starch-based fixing agent on paper is further improved.

Description

technical field [0001] The invention relates to a preparation method of a starch-based fixative, belonging to the technical field of fixatives. Background technique [0002] With the increase in the proportion of waste paper pulp and high-yield pulp and the degree of white water closed circulation, it will inevitably lead to the gradual accumulation of dissolved and colloidal substances (DCS) in the papermaking system, and its deposition problems will affect the wet end of the paper machine and paper. Quality has a huge adverse effect. [0003] In general, DCS is mainly negatively charged anionic garbage, which comes from many sources, including: dissolved or dispersed substances in wood pulping and bleaching processes; dissolved or dispersed substances in pulp refining and storage processes; Scattered substances; other substances derived from clear water, papermaking chemicals, broken paper and secondary recycled fibers; pollutants enriched in white water sealed circulatio...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention: Aiming at the problem that the existing fixatives tend to cause exces