Preparation method of oxidative cationic modified starch slurry

Abstract

The invention provides a preparation method of oxidative cationic modified starch slurry, which comprises the following steps of: firstly, dissolving starch into water to prepare starch milk; secondly, using an oxidant namely sodium hypochlorite to perform oxidation reaction with the starch to obtain oxidized starch; thirdly, removing chlorine; fourthly, adopting a cationic etherifying agent to perform etherification reaction; and finally, performing dehydration and drying. When the modified starch prepared from the starch serves as the slurry, the slurry not only has the characteristics of high fluidity, low viscosity and high concentration usage of oxidative starch slurry, but also solves the problem that the oxidative starch has poor thermal stability through quaternary ammonium etherification, and simultaneously, the slurry additionally obtains the following advantages that: the adhesiveness to a warp is significantly improved; the serous membrane forming capacity is strong, and the slurry is difficult to break and burst; the paste viscosity is stable, and the fluidity is good; the slurry has certain hygroscopicity, and has high co-solvency with a synthetic slurry; a membrane is easy to be dissolved in water, and is easy to desize; and paste solution has high thermal stability, is not influenced by high heat fusing, and the like.

Description

technical field

[0001] The present application relates to a preparation method of composite modified starch, more specifically, relates to a preparation method of oxidized cationic modified starch size used in the field of textile size. Background technique

[0002] In the textile industry, warp yarns for fabrics are staple fibers spun from natural fibers such as cotton, wool, silk, hemp, man-made fibers such as viscose and acetate fibers, and synthetic fibers such as polypropylene, nylon, and polyester. Blended yarn, filament yarn and blended filament, etc. During the weaving process, the warp and weft yarns are subject to different mechanical actions. Each warp yarn not only has to rub against each other, but also has to contact thousands of weft yarns successively, so the friction is very intense. At the same time, due to the opening, picking, and beating-up movement of the loom, the friction between the yarn and the heddle, reed, and warp stopper will cause the warp ya...