Multicomponent modified starch for papermaking and producing method thereof

Abstract

The invention provides multiple-modified starch used in paper making and the production method, in particular to etherifying-oxidating-esterifying multiple-modified starch and the production method. The concrete process includes that the starch is mixed into starch milk with the concentration of 35 to 40 percent through water, etherification reaction to the starch is performed for 1 to 2 hours inthe temperature of 40 to 50 DEG C after adding etherifying agent and under the function of catalyzer number 1, then an oxidizing agent is added, the reaction takes 3 to 5 hours under the conditions that the temperature is 30 to 45 DEG C and the pH value is 8 to 12, then reducing agent is added in to perform reducing treatment, at last esterifying agent and catalyzer number 2 are added in, the reaction takes 1 to 3 hours under the condition that the temperature is 30 to 40 DEG C, acid is used to adjust the pH value, and the modified starch of high binding strength, good ageing resistance, goodwater retention property, good film forming property and high thickness paste liquid with good rheological property in low temperature is obtained through washing, centrifugal dewatering, and drying.

Description

technical field [0001] The invention relates to a production method of modified starch, in particular to a production method of multivariate modified starch mainly used as a high-concentration and high-speed papermaking surface sizing agent, a high-concentration and high-speed coating adhesive and an adhesive for paper products in the papermaking industry. technical background [0002] With the rapid development of papermaking industry technology and the development of large-scale, high-speed and multi-color printing machines, the quality requirements for various types of printing paper are getting higher and higher. All kinds of printing paper and information recording paper must go through two important papermaking processes of surface sizing and coating to improve the quality of paper products. In China, single modified starch has been used as a paper-making adhesive for a long time, and it is mainly used in surface sizing and coating with low concentration and low speed,...

AI Technical Summary

Problems solved by technology

[0010] From the public literature, we can know that the current multivariate modified starches include: oxidation-esterification-grafting ternary composite modified starch, etherification-crosslinking-pregelatinization ternary composite modified starch, esterification-etherification modified starch Etc., so that modified starch has added a lot of new products, but the molecules of various starches are very different. In some starches, complex chemical denaturation methods such as oxidation, esterification, and grafting are not easy to achieve. Therefore, according to different reactive groups, proportions and process conditions, those skilled in the art have developed a variety of products with special properties, so that the modified starch has more functions, such as being used as a papermaking additive. In addition, it can also be used as industrial additives such as textiles and petroleum, and is being paid more and more attention by scientific researchers.