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Preparation method of phosphate and organic acid anhydride composite esterification crosslinking pyrolysis dextrin

A technology of organic acid anhydride and pyrolysis dextrin, which is applied in the field of esterification and crosslinking pyrolysis dextrin preparation, can solve the problems of large viscosity recovery, unstable viscosity of paste liquid, unreasonable state, etc., and achieves moderate hydrophilicity, Improves low-intensity, consistent results

Inactive Publication Date: 2018-05-29
GUANGDONG HUIMEI STARCH SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the state of a single dextrinized modified starch paste is not rational. At high concentrations (40-70%), the viscosity of the paste is unstable, easy to age, and the viscosity rises sharply
The gloss of the coating film is poor, the coating film is brittle, and the adhesion is not strong
In the modern industry that adopts new technologies, new processes, new equipment and increasingly strict environmental protection requirements, the performance limitation of single dextrinization cannot meet the requirements

Method used

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Examples

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Effect test

preparation example Construction

[0015] The invention discloses a method for preparing phosphate and organic acid anhydride complex esterification and crosslinking pyrolysis dextrin. The steps of the method are as follows:

[0016] Step 1, weigh the starch according to the number of parts, add deionized water to adjust the concentration of starch milk to 30-50%, pump the obtained starch milk to the reaction tank, add sodium sulfate accounting for 2.5-15% of the starch mass under stirring conditions, and use 3% Adjust the pH to 8-11 with the mass fraction of sodium hydroxide solution, raise the temperature to 30-60°C, slowly add cross-linking agent glyoxal, epichlorohydrin or phosphorus oxychloride accounting for 0.01-1% of the starch mass, and react 1-5 Hour, adjust pH 4.0-7.0 with the hydrochloric acid solution of 5-15% mass fraction;

[0017] Step 2: add stearic acid polyoxyethylene ether accounting for 0.1-0.8% of starch mass to cross-linked starch milk for pretreatment before esterification, at a temperat...

Embodiment 1

[0023] A method for preparing phosphate and organic acid anhydride complex esterification cross-linked pyrolysis dextrin, the specific steps are as follows:

[0024] Step 1: 100kg cornstarch and deionized water are made into starch milk with a concentration of 30%, the resulting starch milk is pumped into the reaction tank, 2.5kg of sodium sulfate is added under stirring, and sodium hydroxide with a concentration of 3% by mass fraction is used Adjust the pH of the solution to 10, raise the temperature to 50°C, slowly add 0.05kg of epichlorohydrin, react for 2 hours, add hydrochloric acid with a concentration of 10% by mass to adjust the pH to 6.0;

[0025] Step 2: Add 0.5kg polyoxyethylene stearate into the cross-linked starch milk, keep the temperature at 50°C, and react for 45 minutes;

[0026] Step 3: Add 10kg sodium dihydrogen phosphate, 5kg disodium hydrogen phosphate, 5kg maleic anhydride, 0.2kg polyoxyethylene stearate in sequence, continue stirring for 20 minutes, dehy...

Embodiment 2

[0030] A method for preparing phosphate and organic acid anhydride complex esterification cross-linked pyrolysis dextrin, the specific steps are as follows:

[0031] Step 1: 300kg of tapioca starch and deionized water are made into starch milk with a concentration of 40%, and the resulting starch milk is pumped into the reaction tank, and 10kg of sodium sulfate is added under stirring, and the sodium hydroxide solution with a concentration of 3% by mass fraction is used Adjust the pH to 10.5, raise the temperature to 50°C, slowly add 0.5kg of epichlorohydrin, react for 2.5 hours, add hydrochloric acid with a concentration of 10% by mass to adjust the pH to 6.5;

[0032] Step 2: Add 0.9kg polyoxyethylene stearate into the cross-linked starch milk, keep the temperature at 50°C, and react for 30 minutes;

[0033] Step 3: Add 20kg sodium dihydrogen phosphate, 8kg disodium hydrogen phosphate, 7.5kg maleic anhydride and 7.5kg succinic anhydride in sequence, continue stirring for 30 ...

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Abstract

The invention relates to a preparation method of phosphate and organic acid anhydride composite esterification crosslinking pyrolysis dextrin. The preparation method comprises the following steps: mixing starch with a catalyst and a crosslinking agent, cross-linking to obtain cross-linked starch, then performing the esterification, cooling, then adding a trace acid catalyst, and performing the dextrinization reaction to obtain esterification crosslinking pyrolysis dextrin. According to the preparation method, the starch is preprocessed in a crosslinking and esterification manner and then is dextrinated, so that a product has the characteristics of crosslinking starch, esterification starch and dextrin, and is soluble in cold water, high in concentration, low in viscosity, good in viscositystability, high in light transmittance of a coating film, high in adhesive force of the coating film, good in mechanical performance and high in emulsification stability; and the defects that the conventional dextrin is unstable in viscosity and poor in film forming performance and mechanical performance, so that the starch is high in applicability in the fields such as waterborne coating, watertransfer printing and binding of special paper are overcome.

Description

technical field [0001] The invention relates to a method for preparing esterified cross-linked pyrolytic dextrin in modified starch, in particular to a method for preparing compound esterified cross-linked pyrolytic dextrin of phosphate and organic acid anhydride. Background technique [0002] All dextrin products are anhydroglucose polymers with linear, branched or cyclic molecular structures. Industrially produced dextrin products include maltodextrin, cyclodextrin and pyrodextrin. Pyrolytic dextrin is an important product of modified starch. Because of its water solubility, emulsification, adhesion, film-forming properties and other properties, it has been widely used in various industrial fields, such as medicine, coatings, waste water Processing, modification of polymer materials, papermaking, food, adhesives, textiles, etc. However, the paste state of a single dextrinized modified starch is not rational. At a high concentration (40-70%), the viscosity of the paste is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/18C08B31/00C08B31/04C08B31/06
CPCC08B30/18C08B31/003C08B31/04C08B31/066
Inventor 喻永青胡炳峰陆水生
Owner GUANGDONG HUIMEI STARCH SCI & TECH
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