Modified hemicellulose-based paper strengthening agent and preparation method therefor

A hemicellulose-based paper technology, applied in the direction of reinforcing agent addition, can solve the problems of difficult use of paper-making reinforcing agents, difficulty in grafting modification of hemicellulose, and low performance of hemicellulose-based reinforcing agents, and achieve good practical results. Application value, good application value, good performance-enhancing effect

Active Publication Date: 2017-07-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, there are few studies on the preparation of paper strengthening agents for the paper industry using hemicellulose as raw materials. Limited in application, the present invention aims to solve the problem that hemicellulose-based papermaking strengthening agents are difficult to use, and accelerate the industrialization development process of papermaking strengthening agents using hemicellulose as raw materials

Method used

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  • Modified hemicellulose-based paper strengthening agent and preparation method therefor
  • Modified hemicellulose-based paper strengthening agent and preparation method therefor
  • Modified hemicellulose-based paper strengthening agent and preparation method therefor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Hemicellulose, polyethylene glycol (molecular weight: 2000) and isocyanate were weighed in an amount (molar ratio) of 0.29:0.1:1.

[0024] (2) N,N-dimethylformamide and tetrahydrofuran mixed liquid that configuration volume ratio is 1:9 are used as the reaction solvent of modified hemicellulose;

[0025] (3) Transfer the reactant of step (1) and the solvent of step (2) to a round-bottomed flask, place it on a heating stirrer, and stir for 10 min under a nitrogen atmosphere to make the reactant mix uniformly;

[0026] (4) The reaction temperature was set to 90° C., the reaction time was 8 h, and nitrogen was used for protection during the reaction.

[0027] (5) The product was washed three times with ether, and dried at room temperature to obtain a modified hemicellulose-based paper strengthening agent of this embodiment.

[0028] The application performance test of the modified hemicellulose-based paper strengthening agent obtained in the present embodiment:

[00...

Embodiment 2

[0037] (1) Weigh hemicellulose, polyethylene glycol (molecular weight: 2000) and isocyanate with a molar ratio of 0.29:0.1:1.

[0038] (2) N,N-dimethylformamide and tetrahydrofuran mixed liquid that configuration volume ratio is 1:5 are used as the reaction solvent of modified hemicellulose;

[0039] (3) The reactant of step (1) and the solvent of step (2) are transferred in a round bottom flask, placed on a heating stirrer, and stirred for 15min under a nitrogen atmosphere, so that the reactant is evenly mixed;

[0040] (4) The reaction temperature was set to 100° C., the reaction time was 10 h, and nitrogen was used for protection during the reaction.

[0041] (5) The product was washed three times with ether, and dried at room temperature to obtain a modified hemicellulose-based paper strengthening agent of this embodiment.

Embodiment 3

[0043] (1) Weigh hemicellulose, polyethylene glycol (molecular weight: 2000) and isocyanate with a molar ratio of 0.29:0.1:1.

[0044] (2) N,N-dimethylformamide and tetrahydrofuran mixed liquid that configuration volume ratio is 5:5 are used as the reaction solvent of modified hemicellulose;

[0045] (3) The reactant of step (1) and the solvent of step (2) are transferred to a round-bottomed flask, placed on a heating stirrer, and stirred for 20 min under a nitrogen atmosphere, so that the reactant is evenly mixed;

[0046] (4) The reaction temperature was set to 110° C., the reaction time was 8 h, and nitrogen was used for protection during the reaction.

[0047] (5) The product was washed three times with ether, and dried at room temperature to obtain a modified hemicellulose-based paper strengthening agent of this embodiment.

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Abstract

The invention belongs to the technical field of biomass modification and discloses a modified hemicellulose-based paper strengthening agent and a preparation method therefor. The method comprises the steps of adding hemicellulose, polyethylene glycol and isocyanate into a mixed solvent of N,N-dimethylformamide and tetrahydrofuran, carrying out uniform stirring and mixing, heating the temperature of the mixture to 80 DEG C to 110 DEG C under nitrogen protection, carrying out a reaction for 8 to 12 hours, and subjecting the reaction product to washing and drying, thereby obtaining the modified hemicellulose-based paper strengthening agent. The preparation method disclosed by the invention is simple and is low in cost; and the modified hemicellulose-based paper strengthening agent has good dispersity and strengthening performance when the strengthening agent is applied to paper making, thereby having a good physical application value.

Description

technical field [0001] The invention belongs to the technical field of biomass modification, and in particular relates to a modified hemicellulose-based paper strengthening agent and a preparation method thereof. Background technique [0002] In recent years, how to effectively and fully use abundant, renewable and environmentally friendly hemicellulose resources to alleviate severe energy and environmental problems has attracted widespread attention from researchers. [0003] As one of the most widely existing resources in nature, lignin is the second largest amorphous polysaccharide in the plant kingdom after cellulose. It is a renewable, green and environmentally friendly natural polymer material. As a by-product of the paper industry, hemicellulose is seldom further processed and utilized, resulting in waste of resources and even environmental problems. Hemicellulose molecules are rich in hydroxyl groups, so they can be further modified and used. The use of hemicellul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/40C08G18/64C08G18/48D21H21/18
Inventor 彭新文周子丹钟林新吴锡鹏孙润仓
Owner SOUTH CHINA UNIV OF TECH
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