Production technology for succinate coating starch used in papermaking

Abstract

The invention discloses a process for producing succinate coated starch in paper making. In the process, corn starch and water are mixed in a reaction vessel to obtain starch milk, heated up to the temperature of between 34 and 36 DEG C, and added with sodium hydroxide solution to adjust the pH value of the starch milk to between 9.3 and 9.6; the starch milk is added with sodium hypochlorite for oxidizing reaction; and in the reaction, the reaction temperature and the pH value are kept unchanged; the starch milk is added with sodium hydroxide solution again to adjust the pH value of the starch milk to between 8.8 and 9.2, and slowly added with succinate which accounts for 4.5 to 5.5 percent of the total weight of the absolute dry starch for esterification reaction; the pH value and the temperature are kept unchanged during reaction; after the esterification reaction, the starch milk is added with hydrochloric acid solution for neutralization until the pH value of the starch milk is between 5.8 and 6.2; and the neutralized starch milk is washed and dried to obtain the finished product. The product produced by the process has the advantages of low gelatinization temperature, good transparency of pasty liquid, film forming property and water retention property, higher stability, and good compatibility with other coatings.

Description

Production process of succinate-coated starch for papermaking technical field The invention belongs to the technical field of starch processing, in particular to a production process of succinate-coated starch for papermaking. Background technique At present, the coated starch of coated paper in my country is basically oxidized starch or oxidized acetyl starch, and some phosphate ester coated starch produced by dry method is also used. Oxidized starch is simply oxidative denaturation of starch, the molecular chain shortens and the viscosity decreases, and hydroxyl groups are oxidized to carboxyl groups. The hydrophilic properties of the product, film-forming properties, compatibility with other coatings, water retention and stability are not ideal. , affecting the smoothness, surface strength and other properties of the coated paper; while the oxidized acetyl starch is very easy to hydrolyze due to the poor stability of the acetyl group under alkaline and high temperature ...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to provide a production method of succinate coated starch for papermaking with low gelatinization temperature, good film-forming property and water retention in view of the disadvantages existing in the production of succinate-coated starch for papermaking. craft