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Method for synthesizing cation plant fibre strengthening agent by modified glutelin protein

A technology of gluten protein and plant fiber, applied in the field of papermaking, can solve the problems of reducing the molecular weight of protein, can not be used to strengthen the fiber strength, can not be used as a fiber reinforcing agent, etc., and achieves high conversion efficiency, mild reaction conditions, and enhanced wet strength. Effect

Inactive Publication Date: 2010-02-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modification by hydrolysis method can only improve the solubility of gluten protein, but it is not good for improving the binding effect of plant fibers. At the same time, because hydrolysis reduces the molecular weight of protein, it cannot be used to enhance fiber strength; acylation modification cannot improve protein solubility. It cannot be used as a fiber reinforcement after modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, 10 grams of gluten protein was dissolved in 100 mL of 0.2% KCl and pH=8 buffer solution, and 0.024 moles of substituted diamino compound H was added. 2 N(CH 2 ) n NH(CH 2 ) m CH 3 (n=2, m=0), stirred evenly, then added 0.6 g of transglutaminase, and reacted at 50° C. for 1 hour to obtain grafted protein.

[0017] Then, in the grafted protein solution, drip epichlorohydrin (mass ratio is 1: 1), continue in 60 ℃ water bath, react 1 hour, obtain modified gluten protein synthesis cationic plant fiber reinforcing agent, pH value is 7.5. The product is stable, and there is no precipitation after 30 days.

Embodiment 2

[0019] First, 10 grams of gluten protein was dissolved in 100 mL of 0.2% KCl and pH=8 buffer solution, and 0.024 moles of substituted diamino compound H was added. 2 N(CH 2 ) n NH(CH 2 ) m CH 3 (n=6, m=1), stir evenly, then add 0.6 g of transglutaminase, react at 30° C. for 4 hours, and obtain grafted protein.

[0020] Then, in the grafted protein solution, drip epichlorohydrin (mass ratio is 1: 1), continue in 30 ℃ of water baths, react for 4 hours, obtain modified gluten protein synthesis cationic plant fiber reinforcing agent, pH value is 7.2.

Embodiment 3

[0022] First, 5 grams of gluten protein was dissolved in 50 mL of 0.2% KCl and pH 9 buffer solution, and 0.017 moles of substituted diamino compound H was added. 2 N(CH 2 ) n NH(CH 2 ) m CH 3 (n=2, m=0), stir evenly, then add 0.3 g of transglutaminase, react at 30° C. for 2 hours, and obtain grafted protein.

[0023] Then, in the grafted protein solution, add epichlorohydrin (mass ratio is 1: 1) dropwise again, continue to react in 50 ℃ water bath for 2 hours, obtain modified gluten protein synthesis cationic plant fiber reinforcing agent, pH value is 7.5.

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PUM

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Abstract

The invention discloses a method to synthesize the cation vegetable fiber intensifier with the modified glutelin. The invention comprises the following steps: the grafting reaction of the glutelin andthe substituted diamino compound (with the weight ratio of 1:0.7 to 1:2) is conducted under the catalyzing of the transglutaminase, and then an epoxy compound and the grafted glutelin react with theweight ratio of 0.3:1 to 1:1 to generate the modified glutelin containing the annular quaternary ammonium group.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a method for synthesizing a cationic plant fiber reinforcing agent by modifying gluten protein. Background technique [0002] Gluten protein is a kind of plant protein, which is the residue after starch processing of grains such as wheat and corn. Gluten protein can be used as a strength-enhancing aid in papermaking technology. There are many active groups on the protein molecular chain, such as amino, hydroxyl, carboxyl, etc., which have special reactivity and can produce Chemical combination increases the binding force between paper fibers and improves the physical strength of paper. However, since gluten protein contains more hydrophobic amino acids and uncharged amino acids, the area of ​​hydrophobic interaction in the molecule is larger, and the solubility is lower, which often cannot meet the needs of paper production, and its application has many limitations. Therefore, gluten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/22
Inventor 付时雨詹怀宇邓敏尹覃伟
Owner SOUTH CHINA UNIV OF TECH