Production technology of surface glueing starch with high reserving rate

Abstract

The invention relates to a high-retention surface glue-spreading starch producing process: 1), making cation etherification reaction and oxidation reaction; the cation etherification reaction adds in basic catalyst and cation etherifying agent in molar ratio of 1 to 1-3, mixing them fully and raising the temperature to 30-90 deg.C to react for 0.5-4 hours, so as to make the substitution degree of cation etherifying radicals at 0.010-0.025; the oxidation reaction adds in superacid chemical product in 0.1-1% of absolutely dry quantity of starches, controls pH value at 1-4, reacts at 40-90 deg.C for 0.5-5 hours to make starch viscosity reach the value needed, and terminating reaction; 2) making viscosity stabilization reaction; 3) after-processing to obtain the product. It can effectively improve surface strength, printing adaptability and brilliance of paper sheets and reduce the dosage of retaining and filtering auxiliaries and waste water flocculating agent, and also has the characters of simple producing process, high retention, etc.

Description

technical field [0001] The invention relates to a production process of high retention surface sizing starch. Background technique [0002] In order to endow the paper surface with good smoothness and strength, people often solve it by surface sizing modified starch, usually oxidized starch, but this kind of starch has poor affinity with fiber, and when broken paper is returned, most of it enters The white water system increases the BOD and COD values ​​of the system, which is very harmful to environmental protection. At the same time, it affects the Zeta potential of the system, which in turn affects the papermaking of the paper machine, and the surface strength is not good. Because cationic starch has a strong adsorption effect on anionic fibers and fillers, it can be well retained by fibers and effectively reduce environmental pollution. Therefore, domestic and foreign countries are competing to develop cationic starch suitable for paper surface sizing. However, due to ...

AI Technical Summary

Problems solved by technology

The esterification reaction is an anionic reaction, which can improve the viscosity and stability of the starch paste, but has poor affinity for fibers and pollutes wastewater in paper mills.