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A kind of oxidative crosslinking modified starch and preparation method thereof

A technology of oxidative cross-linking and starch, which is applied in the field of modified starch, can solve the problems of low viscosity, achieve the effects of low thermal decomposition temperature, wide range of sources, anti-phase separation and anti-freeze performance

Active Publication Date: 2018-07-06
HENAN HENGRUI STARCH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a kind of oxidative cross-linking modified starch, which has good water solubility and low viscosity, and can be used as a film-forming agent for glass fiber sizing agent. Good compatibility, so that the prepared sizing agent has good uniformity, reduces the migration phenomenon, can form an elastic, smooth and uniform film on the surface of the glass fiber, and enhance the mechanical strength and beautiful appearance of the glass fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:

[0032] 1) Put 100 parts of cornstarch into the reactor, then add 150 parts of water into the reactor, add 2 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;

[0033] 2) Warm up the mixed solution prepared in step 1) to 50° C., then add an aqueous sodium hydroxide solution with a mass concentration of 2% to adjust the pH of the mixed solution to 8, then add 1 part of sodium hypochlorite, and react for 2 hours to obtain a reaction solution 1;

[0034] 3) Add 0.1 part of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 10 minutes, terminate the oxidation reaction to obtain reaction solution 2;

[0035] 4) Add 2% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH=9 of the reaction solution 3, then add 0.05 parts of s...

Embodiment 2

[0039] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:

[0040] 1) Put 100 parts of wheat starch into the reactor, then add 200 parts of water into the reactor, add 4 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;

[0041] 2) Warm up the mixed solution prepared in step 1) to 40° C., then add an aqueous sodium hydroxide solution with a mass concentration of 4% to adjust the pH of the mixed solution to 9, then add 2 parts of sodium hypochlorite, and react for 3.5 hours to obtain a reaction solution 1;

[0042] 3) Add 0.2 parts of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 20 minutes, terminate the oxidation reaction to obtain reaction solution 2;

[0043]4) Add 4% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH of the reaction solution 3 to 10, then add 0.1 pa...

Embodiment 3

[0047] In this example, the oxidized cross-linked modified starch is prepared by the following method, and the specific operation steps are as follows:

[0048] 1) Put 100 parts of pea starch into the reactor, then add 250 parts of water into the reactor, add 6 parts of sodium chloride while stirring, and mix well to obtain a mixed solution;

[0049] 2) Warm up the mixed solution prepared in step 1) to 30° C., then add an aqueous sodium hydroxide solution with a mass concentration of 6% to adjust the pH of the mixed solution to 10, then add 4 parts of sodium hypochlorite, and react for 5 hours to obtain a reaction solution 1;

[0050] 3) Add 0.5 parts of sodium sulfite to the reaction solution 1 prepared in step 2), and after reacting for 30 minutes, terminate the oxidation reaction to obtain reaction solution 2;

[0051] 4) Add 6% aqueous sodium hydroxide solution to the reaction solution 3 prepared in step 3), adjust the pH of the reaction solution 3 to 11, then add 0.2 part...

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Abstract

The invention relates to the technical field of modified starch, and specifically discloses an oxidized cross-linked modified starch and a preparation method thereof. In the preparation process of the modified starch, the starch and the catalyst are first added into water, and mixed uniformly to obtain a mixed solution; then the mixed solution is heated to 30-50°C, the pH of the mixed solution is 8-10, and then an oxidizing agent is added to react 2 ~5 hours, then add reducing agent, stop oxidation reaction, adjust pH=9~11, then add cross-linking agent to react for 2~6 hours, adjust pH=5.0~7.0, suction filter to get solid, that is complete. The modified starch of the present invention has increased fluidity, enhanced film-forming performance, improved anti-phase separation and anti-freeze performance, and when used as a film-forming agent for glass fiber sizing, it is easy to decompose, has less residue, has good weaving performance, and will not cause damage to the cloth surface. Bad quality problems such as yellowing, unevenness, fluffing, etc.

Description

technical field [0001] The invention relates to the technical field of modified starch, in particular to an oxidative cross-linked modified starch and a preparation method thereof. Background technique [0002] Glass fiber is an important new inorganic non-metal composite material. It has many superior properties such as high temperature resistance, corrosion resistance, electrical insulation, high strength, light specific gravity, and high cost performance. It is widely used in electronics, transportation, construction, medical treatment, and aerospace. and other high-tech industries. The production of glass fiber is mainly made of glass as raw material through high-temperature melting, wire drawing, winding, weaving and other processes. Usually, in the glass fiber drawing process, a layer of organic emulsion treatment agent, called sizing agent, needs to be coated on the surface. The sizing agent can bundle the glass fiber loose filaments produced after high-speed wire d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18C08B31/00
CPCC08B31/006C08B31/185
Inventor 张淑芬吴宗帅朱津津吴磊王真真褚冰陈冠杰张永胡荣柳
Owner HENAN HENGRUI STARCH TECH CO LTD
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