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Preparation method of biomass-modified paper wet-strength agent

A wet strength agent and biomass technology, applied in the field of papermaking, can solve the problems of paper wet strength effect not meeting the production requirements, crosslinking degree, low molecular weight, unsatisfactory application effect, etc., achieve high use value and simple preparation steps , low cost effect

Active Publication Date: 2016-11-09
安徽清荷纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: because the traditional polyamide polyamine epichlorohydrin wet strength agent has not been crosslinked and modified, its crosslinking degree and molecular weight are low, the retention performance is poor, and the wet strength effect of paper is far away. Can not meet the production requirements, especially for the defects that the application effect of some paper types requiring high wet strength is still unsatisfactory. The present invention uses biomass cornstarch and chitosan as raw materials and chemically modifies them to obtain good cross-linking properties. Dialdehyde starch and carboxyl-rich modified chitosan, blended with wet strength agent intermediate and epichlorohydrin to finally prepare biomass modified paper wet strength agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, measure 900 mL of sodium periodate solution with a concentration of 0.5 mol / L and put it into a three-necked flask with a stirrer, adjust its pH to 2.0 with a sulfuric acid solution with a concentration of 2 mol / L, and move the flask into a water bath at 50 ° C. Start the agitator and add cornstarch such as sodium periodate while stirring. After 3 hours of heat preservation and reaction, transfer it to a Buchner funnel and wash it with acetone for 5 times, and dry the filter residue to obtain dialdehyde starch, which is then used for later use; Dissolve 15g of chitosan in 900mL of glacial acetic acid and move it into a three-necked flask with a stirrer. Start the stirrer to stir at a speed of 400r / min. During the stirring process, add 100mL of 20% maleic anhydride The acetone solution was dropped into the flask drop by drop within 40min, and the reaction was stirred overnight at room temperature to obtain the mixture; then the mixture obtained above was poured int...

example 2

[0021]First, measure 800 mL of sodium periodate solution with a concentration of 0.5 mol / L and put it into a three-neck flask with a stirrer, adjust its pH to 1.0 with a sulfuric acid solution with a concentration of 2 mol / L, and move the flask into a water bath at 40 ° C. Start the agitator and add cornstarch such as sodium periodate while stirring. After the heat preservation reaction for 2 hours, transfer it to the Buchner funnel and wash it with acetone for 3 times, and dry the filter residue to obtain dialdehyde starch, which is set aside; Dissolve 10g chitosan in 800mL glacial acetic acid and move it into a three-necked flask with a stirrer. Start the stirrer to stir at a speed of 300r / min. During the stirring process, add 50mL of 20% maleic anhydride The acetone solution was dripped into the flask drop by drop within 20 minutes, stirred and reacted overnight at room temperature to obtain the mixture; then the mixture obtained above was poured into 1L of potassium hydroxi...

example 3

[0024] First, measure 850 mL of sodium periodate solution with a concentration of 0.5 mol / L and put it into a three-necked flask with a stirrer, adjust its pH to 1.5 with a sulfuric acid solution with a concentration of 2 mol / L, and move the flask into a water bath at 45 ° C. Start the agitator and add cornstarch such as sodium periodate while stirring. After 2 hours of heat preservation and reaction, transfer it to a Buchner funnel and wash it with acetone for 4 times, and dry the filter residue to obtain dialdehyde starch, which is then used for later use; Dissolve 12g chitosan in 850mL glacial acetic acid and move it into a three-necked flask with a stirrer, start the stirrer to stir at a speed of 350r / min, and in the process of stirring, add 70mL mass concentration of 20% maleic anhydride The acetone solution was dropped into the flask drop by drop within 30 minutes, and the reaction was stirred overnight at room temperature to obtain the mixture; then, the mixture obtained...

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Abstract

The invention relates to a preparation method of a biomass-modified paper wet-strength agent and belongs to the technical field of papermaking. According to the method, biomass corn starch and chitosan are used as raw materials and chemically modified, dialdehyde starch with the good crosslinking property and modified chitosan rich in carboxyl are prepared and are mixed and crosslinked with a wet-strength agent intermediate and epichlorohydrin, and the biomass-modified paper wet-strength agent is prepared finally. The prepared biomass-modified paper wet-strength agent can enhance the dry strength of paper as well as the wet strength of the paper, the dry-strength tensile strength is in a range of 39.54-45.65 N.m / g, the wet-strength tensile strength is in a range of 28.9-30.2 N.m / g, the preparation steps are simple, the required cost is low, and the method can be widely applied to paper enhancement and has relatively high use value.

Description

technical field [0001] The invention relates to a preparation method of a biomass modified paper wet strength agent, belonging to the technical field of papermaking. Background technique [0002] As a kind of additive, wet strength agent has a very wide application in the paper industry. It is widely used in household paper such as toilet paper and napkin paper, and also widely used in packaging paper such as paper shopping bags and packaging boxes. Applications. In addition, there are also wet strength agents in some special paper materials such as wallpaper, label paper, and filter paper. Wet strength agents have different application effects in different environments. As a raw material for papermaking, cellulose has the characteristics of being hydrophilic. When the paper is wetted with water, the cellulose will lose its corresponding strength. In the process of industrial papermaking, if a wet strength agent is added, the wet strength of the paper can be significantly ...

Claims

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Application Information

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IPC IPC(8): D21H21/20D21H17/28D21H17/24
CPCD21H17/24D21H17/28D21H21/20
Inventor 张静薛培龙林茂平
Owner 安徽清荷纸业有限公司
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