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Compound modified starch prepared by four modification methods

A technology for compounding modified starch and starch, applied in the field of compound modified starch, can solve the problems of poor salt resistance and limited application field of compound modified starch, and achieve the effects of good water absorption, good film-forming property and good application prospect.

Active Publication Date: 2013-04-10
郝庆阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compound modified starch prepared by this method has poor salt resistance, which limits its application field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 : Add 1000 parts of water and 700 parts of ethanol with a mass percentage of 95% in a stirring container, stir 1000 parts of cornstarch into a slurry, add 100 parts of lye with a mass concentration of 5%, and 0.05 part of a crosslinking agent. Reaction at ℃ for about 2 hours; Add 350 parts of sodium chloroacetate with a mass percentage of 98%, add 50 parts of lye with a mass concentration of 35%, and react at 80 °C for 4 hours; Add 300 parts of mass percentage 99% Propylene oxide, in Carry out hydroxyalkyl reaction at 80°C for 6 hours; after the reaction is over, add 5 parts of urea and 5 parts of glycerin, and transport them to the pre-gelatinization dryer, adjust the temperature to 130-180°C, and after gelatinization reaction for 1-10 minutes, Dried, crushed, packaged. The product is irregular scales, 2% aqueous solution viscosity η=2000~7500mpa.s, degree of substitution D.S.>0.1, easy to dissolve in cold water, transparent solution, no stratification withi...

Embodiment 2

[0028] Example 2: Add 1,000 parts of water, 800 parts of mass percent 90% methanol, 1,000 parts of wheat starch into a slurry, add 80 parts of liquid caustic soda with a mass concentration of 10%, and 0.03 parts of a cross-linking agent, and react at 20-25°C 2 hours; Add 300 parts of mass percentage 99% propylene oxide, carry out hydroxyalkyl reaction at 80 ℃ for 6 hours; Add 300 parts of lye of mass concentration 35% and 330 parts of sodium chloroacetate of mass percentage 98%, at 80 Carboxymethylation reaction at ℃ for 4 hours; after the reaction, add 8 parts of urea and 4 parts of glycerin, transfer to the pre-gelatinization dryer, adjust the temperature to 130-180 ℃, after gelatinization reaction for 1-10 minutes, dry , shredded packaging. Product shape and performance are close to embodiment 1.

Embodiment 3

[0029] Example 3:Add 1000 parts of water, 700 parts by mass of 95% isopropanol, 1000 parts of potato starch into a stirring vessel, and stir into a slurry; add 50 parts of liquid caustic soda with a mass concentration of 10%, add 300 parts by mass of 99% epoxy resin Propane, carry out hydroxyalkyl reaction at 45°C for 6 hours; add 0.05 part of crosslinking agent, react at 40-45°C for 2 hours; then add 300 parts by mass of 35% lye and 350 parts by mass of 98% chlorine Sodium acetate, carry out carboxymethylation reaction at 65 ° C for 4 hours; after the reaction is completed, add 8 parts of urea and 4 parts of glycerol, and transport it to the pre-gelatinization dryer, adjust the temperature to 130 ~ 180 ° C, and gelatinization reaction 1 ~ 10 After 1 minute, it was dried, pulverized, packaged, and the appearance and properties of the product were similar to those of Example 1.

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Abstract

The invention provides a process for preparing compound modified starch. The compound modified starch is obtained by starch modification through cross linking reaction, carboxymethyation reaction, hydroxyalkylation reaction and pre-gelatinization reaction; is advantageous in good performance, stable viscosity, rapid solution in cold water, good water-absorbing capability, strong re-hydration property, shear resistance, acid resistance and salt / alkali resistance; and has the characteristics of higher freezing stability and freeze / thawing stability, no flocculation or deposition and good film-forming property. Besides, the process can manufacture products with different performances by adjusting the quantity of auxiliary ingredients and adjusting the sequence of reactions, and has good application prospects in the fields of building mortar and coatings, petroleum drilling, textile printing and dyeing and the like.

Description

technical field [0001] The invention relates to a method for preparing modified starch, in particular to a method for compound modified starch prepared by various modification methods. Background technique [0002] Modified starch is chemically or physically treated to replace or derivatize some groups in the starch molecule, thereby changing many properties of starch, so it is called modified starch. At present, the production methods of modified starch include wet method, dry method and solvent method. Among them, the wet method is based on the starch milk prepared by starch and water or other liquid media, and the modified reaction is carried out with chemical reagents under certain conditions to generate modified starch. The process in which the starch granules are in a non-gelatinized state. In the process of denaturing starch, different treatments of starch can obtain modified starch with different characteristics and usage significance. [0003] At present, pregelat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C08J3/24C08L3/02C08L3/08
Inventor 郝庆阳
Owner 郝庆阳
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