Amphiprotic starch graft copolymer and its one-step preparing process

Abstract

A process for preparing the graft copolymer of amphiprotic starch prepared by one-step method includes such steps as preparing amphiprotic starch by both cationic and anionic reaction at 20-60 deg.C, where mixed water-alcohol solvent is used as reaction medium, tripolyphosphate or pyrophosphate as anionic reagent and 3-Cl-dihydroxytrimethylamine hydrochloride as cationic reagent, the graft copolymerizing between amphiprotic starch and acrylamide at 5-60 deg.C in water phase, and cationic reacting for the graft chain of said graft copolymer at 2-50 deg.C in water phase. Its advantages are better network structure, and high stability.

Description

technical field

[0001] The invention relates to the field of chemistry, in particular to preparing a starch product with both functional structure and network structure on the starch chain skeleton and grafted chain skeleton. This technology is used in modified starch production enterprises, and the resulting amphoteric starch graft copolymer products can be used in a wide range of industries and fields such as papermaking, textiles, chemicals, pharmaceuticals, petroleum, environmental protection, agriculture and mining. Background technique

[0002] Starch is a natural polymer compound, synthesized by plants through photosynthesis, and its basic component is carbohydrates. Starch products mainly refer to naturally occurring raw starch and denatured starches that have been modified by various physical, chemical and biological methods. starch. Amphoteric starch and starch graft copolymer are two major types of modified starch products.

[0003] At present, the amphoteric st...