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Method for preparing modified starch and application of modified starch

A technology of modified starch and corn starch, which is applied in textiles, papermaking, fiber treatment, etc. It can solve the problems of limited application fields, poor salt resistance of compound modified starch, etc., and achieve good film-forming properties, good water absorption and good application prospects. Effect

Active Publication Date: 2013-10-09
SHANDONG SHENZHOU XIANGYU TECH GRP
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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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  • Method for preparing modified starch and application of modified starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Preparation method of modified starch of the present invention

[0021] The starch is first mixed with water or alcohol-water mixture into a slurry, and the temperature of the mixture is raised to 40 ° C under alkaline conditions, and an oxidant is added to the mixture to keep the reaction for 3 hours; under alkaline conditions, the temperature of the reaction solution is raised After 55 ℃, add the cross-linking agent to the reaction solution and keep the reaction for 2 hours; under alkaline conditions, maintain the temperature of the reaction solution at 25 ℃ and add propylene oxide or ethylene oxide to the reaction solution, and keep the temperature for 2 hours to carry out hydroxyalkane. base reaction; maintain the temperature of the reaction solution at 25°C, add the mixture of malondialdehyde / urea to the reaction solution and adjust the pH of the reaction solution to be 3.0, and filter after the reaction for 1 hour, drying and pulverizing the filter cake ...

Embodiment 2

[0023] Example 2 The preparation method of modified starch of the present invention

[0024] Mix starch with water or alcohol-water mixture into slurry first, raise the temperature of the mixture to 50°C under alkaline conditions, add an oxidant to the mixture and keep the reaction for 1 hour; under alkaline conditions, raise the temperature of the reaction solution After 60 ℃, add the cross-linking agent to the reaction solution and keep the reaction for 1.5 hours; under alkaline conditions, maintain the temperature of the reaction solution at 40 ℃ and add propylene oxide or ethylene oxide to the reaction solution, keep the temperature for 1.5 hours to carry out hydroxyalkane base reaction; maintain the temperature of the reaction solution at 30°C, add the mixture of malondialdehyde / urea to the reaction solution and adjust the pH of the reaction solution to 4.5, and filter after the reaction for 1 hour, drying and pulverizing the filter cake to obtain this product. Invented...

Embodiment 3

[0026] Example 3 The preparation method of modified starch of the present invention

[0027]The starch is first mixed with water or alcohol-water mixture into a slurry, and the temperature of the mixture is raised to 35 ° C under alkaline conditions, and an oxidant is added to the mixture to keep the reaction for 1.5 hours; under alkaline conditions, the temperature of the reaction solution is raised. After 60 ℃, add the cross-linking agent to the reaction solution and keep the reaction for 1.5 hours; under alkaline conditions, maintain the temperature of the reaction solution at 25 ℃ and add propylene oxide or ethylene oxide to the reaction solution, and keep the temperature for 1.5 hours to carry out hydroxyalkane. base reaction; maintain the temperature of the reaction solution at 30°C, add the mixture of malondialdehyde / urea to the reaction solution and adjust the pH of the reaction solution to 4.0, and filter after the reaction for 1 hour, drying and pulverizing the filt...

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Abstract

The invention relates to a method for preparing a modified starch, and particularly relates to a method for preparing a modified starch by adopting various modifying methods and an application of the modified starch, and the method can be used for overcoming the defects that the existing starches can not be widely used for starching spinning warp yarns and the processes for preparing the modified starches are complex. According to the method, the corn starch is modified by carrying out oxidizing reaction, crosslinking reaction and hydroxyalkylation reaction and treating by using malondialdehyde / urea. The prepared modified starch has stable viscosity, can dissolve in cold water rapidly, is characterized by shearing force resistance, acid, salt and alkali resistance and good film-forming properties and is very similar to PVC and CMC in nature. The modified starch can be used for starching spinning warp yarns, so that the cost spent in starching the spinning warp yarn can be reduced greatly, and the process of starching the spinning warp yarn process can be more environmentally-friendly.

Description

technical field [0001] The invention relates to a method for preparing modified starch, in particular to a method for preparing modified starch through various denaturation methods and its application. Background technique [0002] Sizing technology and size is an old topic, and sizing technology and size are constantly developing with the development of science and technology and textile industry. At present, the speed of some domestic air-jet looms has been set at 700r / min or even higher. This undoubtedly challenges the development of sizing technology and size. PVA (polyvinyl alcohol) is widely used in the preparation of textile pulp due to its strong film strength, good flexibility, and good fluidity of the slurry, and it is difficult to replace other raw materials. Due to the presence of polyvinyl alcohol, it is difficult to degrade naturally, It will cause disadvantages such as white environmental pollution. If the content of polyvinyl alcohol is insufficient, it wil...

Claims

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Application Information

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IPC IPC(8): C08B31/18C08B31/12C08B31/00D06M15/11
Inventor 任振峰
Owner SHANDONG SHENZHOU XIANGYU TECH GRP
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