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Method for preparing low-viscosity amphoteric starch

A technology of amphoteric starch and low viscosity, which is applied in the field of preparation of amphoteric starch, can solve the problems of complex manufacturing steps and processes, large gaps, high production technology requirements, etc., and achieve good economic benefits

Inactive Publication Date: 2015-01-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different degradation methods and degrees can produce a series of products with different qualities. There are many varieties. The manufacturing steps and processes are more complicated. The requirements for production technology are higher. The quality of domestic products is far behind that of foreign countries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Slurry mixing and cationic etherification reaction: Stir 1000 kg of dry corn starch into water to obtain a starch emulsion. The dry solid concentration of the emulsion is 45% (w / w), and 50 kg of sodium sulfate is added. Raise the temperature to 50°C, adjust the pH of the starch milk to 11.0 with a 4% (w / w) sodium hydroxide solution, keep the temperature and pH of the starch milk, and add 50 kg of 3-chloro-2-hydroxypropyl trimethyl Hydroxyl ammonium chloride, then stirred occasionally, and reacted for 24.0 hours. After reacting for 20.0 hours, the pH of the system was no longer adjusted.

[0029](2) Oxidation reaction, reduction, and neutralization: keep the temperature at 50°C, add a sodium hypochlorite solution with an available chlorine content of 60 kg to carry out the oxidation reaction, control the flow rate, keep the pH at 9.5, and react for 6.0 hours. Stir and add 0.55 kg of sodium metabisulfite (solution) to eliminate residual oxidants in the system.

[00...

Embodiment 2

[0034] (1) Sizing and cationic etherification reaction: Stir 1000 kg of dry corn starch into water to obtain a starch emulsion. The dry solids concentration of the emulsion is 45% (w / w), and add 50 kg of sodium sulfate. Raise the temperature to 50°C, adjust the pH of the starch milk to 11.0 with 4% (w / w) sodium hydroxide solution, keep the temperature and pH of the starch milk, and add 50 kg of 3-chloro-2-hydroxypropyl trimethyl Hydroxyl ammonium chloride, then stirred occasionally, and reacted for 24.0 hours. After reacting for 20.0 hours, the pH of the system was no longer adjusted.

[0035] (2) Oxidation reaction, reduction, and neutralization: keep the temperature at 50°C, add a sodium hypochlorite solution with an available chlorine content of 60 kg to carry out the oxidation reaction, control the flow rate, keep the pH at 9.5, and react for 6.0 hours. Stir and add 0.55 kg of sodium metabisulfite (solution) to eliminate residual oxidants in the system.

[0036] (3) Este...

Embodiment 3

[0040] (1) Slurry mixing and cationic etherification reaction: Stir 1000 kg dry weight cornstarch into water to obtain a starch emulsion. The dry solids concentration of the emulsion is 40% (w / w), and add 20 kg of sodium sulfate. Raise the temperature to 50°C, adjust the pH of the starch milk to 11.5 with a 4% (w / w) sodium hydroxide solution, keep the temperature and pH of the starch milk, and add 10 kg of 3-chloro-2-hydroxypropyl trimethyl Hydroxyl ammonium chloride, then stirred from time to time, and reacted for 8.0 hours. After reacting for 6.5 hours, the pH of the system was no longer adjusted.

[0041] (2) Oxidation reaction and reduction: Keep the temperature at 50°C, add 30 kg of 30% hydrogen peroxide solution to carry out the oxidation reaction, control the flow speed, keep the pH at 11.0, and react for 3.0 hours. Stir and add 0.15 kg of sodium metabisulfite (solution) to eliminate residual oxidants in the system,

[0042] (3) Esterification reaction and neutralizat...

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Abstract

The invention discloses a method for preparing low-viscosity amphoteric starch. The method comprises the following steps: mixing native starch, adding alkali liquor, and feeding 3-chloro-2-hydroxypropyltrimethyl ammonium chloride to perform a cationic etherification reaction for 8.0-24.0 hours; feeding an oxidant solution to oxidize for 3.0-6.0 hours, and adding a reducing agent for reduction; feeding alkenyl succinic anhydride to esterify for 8.0-20.0 hours; neutralizing by a hydrochloric solution, removing liquid, washing, dehydrating, pneumatically drying, cooling and packaging to obtain the product of low-viscosity amphoteric starch. Series of products prepared by the method have electric charge characteristics of anions and cations with different surface activities and different quantitative proportions, as well as different viscosity and mobility ranges, has the advantages of multiple functions and wide application range, and is applicable to non-food industrial applications, such as pesticide, daily-use chemical thickening agents, emulsifiers or microcapsule embedding materials with good effect.

Description

technical field [0001] The invention relates to a preparation method of amphoteric starch, in particular to a preparation method of low-viscosity amphoteric starch. Background technique [0002] Cationic starch has a positive charge and is a very important class of starch derivatives. It is widely used in papermaking, textiles, oil field drilling and other industrial fields. Quaternary ammonium cationic starch is one of the most important types. It is a combination of starch and 3-chloro -2-Hydroxypropyltrimethylammonium chloride is obtained by etherification reaction under alkaline conditions. Quaternary ammonium cationic starch exhibits higher positive charge characteristics in acidic and larger alkaline pH ranges, and has good application effects. It is an indispensable additive in the paper industry. Amphoteric starch refers to a compound modified starch in which both cationic groups and anionic groups are bonded in the same starch molecule. Due to the synergistic effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/16
Inventor 黄立新李茹刘莹莹杨博简淑贞刘娟
Owner SOUTH CHINA UNIV OF TECH
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