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A kind of preparation method of grafted starch size based on enzymatic cascade reaction

A technology of cascading reaction and grafting starch, which is applied in textiles and papermaking, fermentation, fiber treatment, etc. It can solve the problems of insignificant improvement of product film-forming performance, difficult control of grafting process, harsh grafting conditions, etc., and it is easy to achieve control, stable slurry viscosity, and good fiber adhesion

Active Publication Date: 2017-11-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although grafted starch has been highly valued and a lot of research has been carried out, various existing synthetic methods have many defects such as harsh grafting conditions and difficult control of the grafting process, especially due to the composition and structure of starch itself. Limitation (mainly the influence of amylopectin), the film-forming performance of the product is not significantly improved, which seriously affects its application effect in film-forming materials
For example, in textile pulp, the current grafted starch cannot completely or in high proportion replace the hard-to-biodegrade polyvinyl alcohol pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 preparation method of grafted starch slurry based on enzymatic cascade reaction

[0019] (1) Preparation of co-modified enzymes: Dissolve lactate oxidase and horseradish peroxidase in deionized water, add natural biological cross-linking agent genipin, lactate oxidase, horseradish peroxidase and genipin in the system The average mass concentration is 0.01, 15% and 5% respectively, and then react 1 at 30°C; after the reaction, the reaction solution is lowered to room temperature for use;

[0020] (2) Preparation of grafted starch: the corn starch is made into a mass concentration of 10%, and 2% mass concentration of lactic acid and 1% mass concentration of acrylic monomer are added, and the temperature is adjusted to 80°C after gelatinization for 0.1 hour at 70°C. ℃;

[0021] (3) Add the co-modified enzyme solution prepared in step (1) to the mixed starch solution in step (2), and then keep it warm at 40°C for 10 hours; after the reaction, cool it down to r...

Embodiment 2

[0024] Embodiment 2 preparation method of grafted starch slurry based on enzymatic cascade reaction

[0025] (1) Preparation of co-modified enzymes: Dissolve lactate oxidase and horseradish peroxidase in deionized water, add natural biological cross-linking agent genipin, lactate oxidase, horseradish peroxidase and genipin in the system The average mass concentration was 10%, 0.01% and 1%, respectively, and then reacted at 55°C for 8h; after the reaction, the reaction solution was lowered to room temperature for use;

[0026] (2) Preparation of grafted starch: make potato starch into 30% mass concentration, add 0.1% mass concentration lactic acid and 20% mass concentration acrylic monomer, heat up to 95°C for gelatinization for 1 hour, then adjust the temperature to 40°C;

[0027] (3) Add the co-modified enzyme solution prepared in step (1) to the mixed starch solution in step (2), and then keep it warm at 80°C for 1 hour; after the reaction, cool down to room temperature to ...

Embodiment 3

[0029] Embodiment 3 preparation method of grafted starch slurry based on enzymatic cascade reaction

[0030] (1) Preparation of co-modified enzymes: Dissolve lactate oxidase and horseradish peroxidase in deionized water, add natural biological cross-linking agent genipin, lactate oxidase, horseradish peroxidase and genipin in the system The average mass concentration was 0.5%, 10% and 2%, respectively, and then reacted at 45°C for 2 hours; after the reaction, the reaction solution was lowered to room temperature for use;

[0031](2) Preparation of grafted starch: the starch is made into a 20% mass concentration solution, and 0.4% mass concentration lactic acid and 14% mass concentration acrylic monomer are added, and the temperature is adjusted to 85° C. after gelatinization for 0.5 hour. 60°C;

[0032] (3) Add the co-modified enzyme solution prepared in step (1) to the mixed starch solution in step (2), and then keep it warm at 60°C for 8 hours; after the reaction, cool it d...

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Abstract

The invention discloses a method for preparing grafted starch slurry based on an enzymatic cascade reaction. In the method, a co-modification technology is first used to cross-link lactic acid oxidase and horseradish peroxidase to form a co-modified enzyme; Starch is made into a solution with a certain concentration, and lactic acid and acrylic monomers are added, and the temperature is raised to 70-95°C for gelatinization for 0.1-1 hour, then the temperature is adjusted to 40-80°C, and finally the co-modified enzyme is added to the starch solution to keep warm Reaction 1‑10 hours. The method of the present invention realizes the biological preparation of grafted starch through enzymatic cascade reaction, the graft polymerization reaction is easy to control, the product has the characteristics of synthetic polymer and starch, and the prepared grafted starch has the adhesion to fiber: cotton>70N, polyester >90N; serous film bending resistance >500 times; serous film strength: 20.0-33.5N / mm2, serous film elongation: 3.5-5.9%, serous viscosity stability: >90%.

Description

technical field [0001] The invention relates to a method for preparing grafted starch size based on enzymatic cascade reaction, which belongs to the technical field of textiles. Background technique [0002] Starch is a natural polysaccharide that is abundant, renewable, biodegradable, low-cost, and widely available worldwide. However, compared with synthetic polymers, it has some disadvantages in terms of performance, such as its thermal stability, solubility, ion exchange and so on. The chemical modification of starch by oxidation, hydrolysis, esterification and grafting has been extensively studied. Graft modification of starch is a very effective means to change the physical and chemical properties of starch. By introducing a flexible chain into the rigid main chain of starch, its film-forming flexibility, thermal stability, metal ion binding ability, and resistance to Biocorrosion and other properties enhance its industrial applicability and expand its application ran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C12P19/04D06M15/263D06M15/285D06M15/31D06M15/333
Inventor 王强范雪荣徐进袁久刚余圆圆王平崔莉张颖
Owner JIANGNAN UNIV