Preparation method of carboxymethyl starch used for reactive dye printing

Abstract

The invention discloses a preparation method of carboxymethyl starch used for reactive dye printing. Starch is taken as a main raw material, a compound modification technology is adopted, different modification reactions are successively completed in slurry taking a mixed solvent as a reaction medium, and finally the carboxymethyl starch is generated. The preparation method comprises the following steps: firstly dispersing starch in the mixed solvent containing ethyl alcohol and isopropyl alcohol, adding alkaline liquor for carrying out low temperature alkalization, then adding an etherifying agent for carrying out high temperature etherification, then adding a crosslinking agent at a certain temperature for carrying out micro-crosslinking, after crosslinking reaction is finished, washing, drying, and smashing, so that the carboxymethyl starch is obtained. The preparation method disclosed by the invention has the advantages that the mixed solvent is adopted in the technology, so that carboxymethylation reaction of the starch can be promoted, and substitution uniformity of the product is improved; the starch is subjected to low temperature alkalization, so that starch pasting can be effectively prevented, and the solubility and transparency of the product are improved; high temperature etherification can promote the permeation effect of feed liquid to the starch, and the reaction rate is accelerated; and micro-crosslinking can improve the structural viscosity and salt resistance of the product to a certain degree. The carboxymethyl starch product can completely replace sodium alginate.

Description

technical field [0001] The invention belongs to the technical field of synthesis of organic polymer compounds; in particular, it relates to the preparation of carboxymethyl starch for reactive dye printing with starch as the main raw material. Background technique [0002] my country is a big textile country. According to statistics, the annual demand for printing paste in China will reach 600,000 tons in 2015, and the market for printing paste is huge. Since the advent of reactive dyes, the performance of printing paste itself has played an extremely important role in the quality of printing products. As a traditional printing paste, sodium alginate has the advantages of high paste rate, good permeability, easy depaste, and good printing feel, and is favored by dyeing and finishing workers at home and abroad. However, in recent years, the biological activity of sodium alginate has been gradually discovered, and it has been used as food additives, health care products, and ...

AI Technical Summary

Problems solved by technology

[0003] The production process of carboxymethyl starch (CMS) is mainly divided into three types: water-based method, dry method and solvent method: the degree of substitution of the product obtained by the water-based method is less than 0.1, and it is insoluble in cold water, so it is generally not used for printing and dyeing; the dry method is due to poor reaction. Uniformity, the resulting product has low purity, uneven substitution degree, poor viscosity and transparency, poor water retention during printing, serious seepage phenomenon, and unsatisfactory printing effect; the reaction efficiency of the traditional solvent method production process is greatly improved, and the product substituents are evenly distributed , high purity, but due to the molecular structure of starch itself, the product has poor salt resistance and temperature resistance, which cannot fully meet the requirements of reactive dye printing production technology and equipment