Method for modifying gluten protein used as paper strengthening agent

A technology of paper strengthening agent and gluten protein, which is applied in the field of paper strengthening agent, can solve the problems of difficult fiber binder, easy agglomeration, poor water solubility and dispersibility, etc., and achieve the effect of good performance parameters

Inactive Publication Date: 2007-05-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first-order molecular structure of gluten protein is a polypeptide, and it has more than 50% glutamic acid, which is easy to agglomerate, and has poor water solubility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] (1) Add gluten protein powder to a three-necked flask equipped with a temperature controller, agitator and feeder, adjust the concentration of the suspension to 5%, adjust the pH of the reaction system to 3 with formic acid solution, and control the temperature at 70°C In the water bath, slowly add formaldehyde 8% / gluten protein powder dropwise, react for 2 hours, and collect the intermediate product.

[0022] (2) Add 5% epichlorohydrin slowly to the intermediate product in a water bath at 60°C, and react for 2 hours. During the reaction, the water-insoluble epichlorohydrin gradually disappeared, and the cream yellow protein retention solution became more thorough. After the reaction, the gluten solution turned milky white. It can be miscible with water in any ratio; pH value: 4.5; solid content: 5%; stability: storage at room temperature for 6 months without turbidity or gel phenomenon.

[0023] (3) The dry tensile index of the paper is increased by 35%,...

Example Embodiment

[0024] Example 2

[0025] (1) Add gluten protein powder to a three-necked flask equipped with a temperature controller, agitator and feeder, adjust the concentration of the suspension to 1%, adjust the pH of the reaction system to 2 with formic acid solution, and control the temperature at 20°C In the water bath, slowly add formaldehyde 5% / gluten protein powder dropwise, react for 2 hours, and collect the intermediate product.

[0026] (2) Add 1% epichlorohydrin slowly to the intermediate product in a water bath at 20°C, and react for 2 hours. During the reaction, the water-insoluble epichlorohydrin gradually disappeared, and the cream yellow protein retention solution became more thorough. After the reaction, the gluten solution turned milky white.

[0027] (3) The dry tensile index in the paper is increased by 30%, and the wet strength retention rate is 20%.

Example Embodiment

[0028] Example 3

[0029] (1) Add gluten protein powder into a three-necked flask equipped with a temperature controller, agitator and feeder, adjust the concentration of the suspension to 10%, adjust the pH of the reaction system to 6 with formic acid solution, and control the temperature at 100°C In the water bath, slowly drip 15% formaldehyde / gluten protein powder, react for 1 hour, and collect the intermediate product.

[0030] (2) Add 10% epichlorohydrin slowly to the intermediate product in a water bath at 100°C, and react for 1 hour. During the reaction, the water-insoluble epichlorohydrin gradually disappeared, and the cream yellow protein retention solution became more thorough. After the reaction, the gluten solution turned milky white.

[0031] (3) The dry tensile index of the paper is increased by 33%, and the wet strength retention rate is 20%.

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PUM

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Abstract

The invention discloses a method of modifying gluten to making paper intensifier. The method includes the following steps: (1) hydroxylation: glutening the gluten powder into regulating suspension, regulating the pH of the reaction system to 2-6 with acid liquor, controlling the reaction temperature in 20~100degreeC water bath, dropping formaldehyde which weight is 5 ~ 15% of gluten powder slowly, reaction 1~8 hours then collecting the intermediate product. (2) cationised reaction: dropping epichlorohydrin which consumption is 1~10% of gluten weight into intermediate product slowly in 20~100degreeC water bath, reaction 1~4 hours and getting the lacte gluten liquid change. The invention synthesizes the products with the raw materials of plant protein which is renewable resources and with biocompatibility; it does not bring secondary pollution, provides a new channels for the processing of agricultural producing by-product utilization of high-value, the synthesized paper fiber intensifier makes the dry tensile index in paper increases more then 35% and the rate of wet strength retention is more then 20%.

Description

technical field [0001] The invention relates to a paper strengthening agent for papermaking technology, in particular to a preparation method for synthesizing a paper strengthening agent from gluten protein, and in particular to a gluten protein modification method used as a paper strengthening agent. Background technique [0002] Gluten protein (gluten) is a by-product of cereal starch processing, containing albumin, globulin, gliadin and glutenin four proteins, a biodegradable, renewable natural polymer. At present, it is less developed and utilized at home and abroad, and the research on gluten protein in my country is still in its infancy, and it is mainly used in the food field, such as adding gluten to flour to make strong noodles, rolls, etc.; and the industry with higher added value Use of unseen research reports. Due to the unique viscoelasticity, elongation, film formability, and heat coagulation of gluten protein, it can not only be used in the food field, but als...

Claims

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Application Information

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IPC IPC(8): D21H21/18
Inventor 付时雨
Owner SOUTH CHINA UNIV OF TECH
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