Method for producing oxidized starch

Abstract

The invention relates to a method for producing oxidized starch. The method comprises the following steps of: adding copper sulfate accounting for 0.005 to 0.02 percent of dry starch into starch milk and uniformly stirring the mixture; adding sodium hypochlorite into the mixture, controlling liquor adding speed, keeping the pH value of the mixture at 9, adding 4 percent solution of sodium hydroxide into the mixture when the pH value of the mixture falls, adjusting the pH value to be 9 and controlling a temperature to be between 32 and 35 DEG C; adding hydrochloric acid into the mixture after an oxidation reaction is performed so as to adjust the pH of the starch milk to be neutral; and centrifugally dewatering the starch milk and performing air drying on the dewatered starch milk until the water content of the starch milk is less than or equal to 14 percent. An activation process is added in the oxidized starch production method, so that the oxidation reaction speed of the starch is increased, reaction time is shortened and the using amount of the sodium hypochlorite serving as an oxidant is reduced.

Description

technical field

[0001] The invention relates to the production technology of modified starch, in particular to a production method of oxidized starch. Background technique

[0002] Oxidized starch is a modified starch that is widely used. In food processing, oxidized starch can be used as low-viscosity thickener; in paper industry, oxidized starch can be used as sizing agent and adhesive; in textile industry, oxidized starch can be used as sizing agent. In addition, oxidized starch can also be used as a binder in coatings, gypsum boards, hard fiberboards, and precision casting model industries.

[0003] The existing production method of oxidized starch generally adopts wet method, which is to add oxidant sodium hypochlorite to starch milk, and react at high temperature to form oxidized starch. By adjusting the amount of oxidant, reaction temperature and time, oxidized starch with required viscosity is produced. , the add-on of this method sodium hypochlorite is 3.5~4%, con...