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Water absorbing agent for paper and preparation method thereof

A technology for water-absorbing agent and paper, applied in the direction of papermaking, textile and papermaking, non-fiber pulp addition, etc., can solve the problems of reduced wet strength, reduced water absorption performance, unfavorable water absorption, etc.

Active Publication Date: 2011-12-21
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, wet strength agents such as urea-formaldehyde resin, melamine-formaldehyde resin and polyamide polyamine epichlorohydrin resin commonly used in acidic conditions will reduce the water absorption performance of paper. In addition, additives containing aldehyde groups in the molecule, For example, dialdehyde starch, glyoxal modified acrylamide, etc. can only give temporary wet strength to the paper, and are not conducive to the absorption of water.
[0003] In order to facilitate the absorption of water by the paper, surfactants are usually added to it, but these agents will reduce the dry strength of the paper and reduce the wet strength at the same time.

Method used

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  • Water absorbing agent for paper and preparation method thereof
  • Water absorbing agent for paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 206 grams of diethylenetriamine to a 2L four-necked flask equipped with a condenser, a thermometer and agitation. While stirring, add 20.6 grams of hydrochloric acid with a concentration of 10% by weight. After stirring evenly, add hexane within one hour. 292 grams of diacid, reacted at 130°C for 30 minutes, continued to heat up to 190°C and reacted for 2 hours, and when cooled to 140°C, added 426 grams of hot water at 80°C to obtain a polycondensate solution with a solid content of 50%, and cooled to room temperature.

[0025] In the polycondensate solution, adjust the pH of the polycondensate solution to 5.0 with formic acid with a weight concentration of 10%, add 0.7 g of glyoxal with a weight of 30%, stir well, slowly heat up to boiling, and reflux for 1 hour, add 365 grams of deionized water to adjust the solid content of the solution to 35%, and then reduce the system temperature to 40°C;

[0026] Use 32% sodium hydroxide to adjust the pH value of the above s...

Embodiment 2

[0028] Add 292 grams of triethylenetetramine to a 2L four-necked flask equipped with a condenser, a thermometer and agitation. While stirring, add 87.6 grams of hydrochloric acid with a concentration of 10% by weight. After stirring evenly, add butyl 236 grams of diacid, reacted at 130°C for 40 minutes, continued to heat up to 180°C and reacted for 3 hours, and when cooled to 140°C, added 456 grams of hot water at 80°C to obtain a polycondensate solution with a weight concentration and a solid content of 50%. , cooled to room temperature.

[0029] In the polycondensate solution, adjust the pH of the polycondensate solution to 5.5 with formic acid with a weight concentration of 10%, add 2.92 grams of glyoxal with a weight concentration of 30%, after stirring evenly, slowly heat up to boiling, and reflux after 1.5 hours, Add 608 grams of deionized water to adjust the solid content of the solution to 30%, and then lower the system temperature to 40°C;

[0030] Use 32% potassium ...

Embodiment 3

[0032] Add 199 grams of tetraethylenepentamine to a 2L four-necked flask equipped with a condenser, a thermometer and stirring, and add 99.5 grams of sulfuric acid with a concentration of 10% by weight while stirring. 202 grams of diacid, react at 130°C for 60 minutes, continue to heat up to 155°C and react for 6 hours, when cooling to 140°C, add 329 grams of hot water at 80°C to obtain a polycondensate solution with a solid content of 50%, and cool down to room temperature.

[0033] In the polycondensate solution, use 10% hydrochloric acid to adjust the pH of the polycondensate solution to 6.0, add 33.1 grams of glutaraldehyde with a weight concentration of 30%, stir evenly, slowly heat up to boiling, reflux for 1 hour, and then add The weight concentration solid content of 517 grams of ionized water adjustment solution is 28%, then system temperature is down to 40 ℃;

[0034] Use 32% sodium hydroxide to adjust the pH value of the above solution to 8.5, slowly add 46 grams o...

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Abstract

The invention provides a water-absorbing agent for paper and a preparation method thereof. The preparation method comprises the following steps: (1) adding polyethylene polyamine and a reaction auxiliary agent to a polybasic acid, reacting at 120-130°C, and then reacting at 155-190°C , lower the temperature to 120-140°C, add hot water, (2) adjust the pH of the polycondensate obtained in step (1) to 5-7 with an acid, then add the aldehyde solution, reflux for 1-2 hours, and dilute with water, (3) Adjust the pH of the solution obtained in step (2) to 8-8.5 with an alkaline solution, dropwise add epichlorohydrin, heat up to 60-75°C to react, add water to dilute, and adjust the pH to 3-5 with an acid solution, That is, the water-absorbing agent is obtained. The present invention is a non-heat-curable cationic polymer. The water-absorbing agent is used in combination with an anionic polymer containing carboxyl or carboxylate and a thermosetting cationic wet-strength agent PAE to increase the dry tensile strength and wet tensile strength of paper. Strength while absorbing moisture quickly.

Description

technical field [0001] The invention relates to a water-absorbing agent for paper and a preparation method thereof. Background technique [0002] Products such as toilet paper and tissue paper require that the paper sheet not only have good water absorption, but also have high wet strength so that it can still maintain structural integrity when subjected to external forces. However, the additives that make the paper sheet have good water absorption tend to reduce the wet strength of the paper, while the wet strength agent often increases the hydrophobicity of the paper surface. For example, wet strength agents such as urea-formaldehyde resin, melamine-formaldehyde resin and polyamide polyamine epichlorohydrin resin commonly used in acidic conditions will reduce the water absorption performance of paper. In addition, additives containing aldehyde groups in the molecule, For example, dialdehyde starch, glyoxal modified acrylamide, etc. can only give the paper a temporary wet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/50C08G69/48C08G69/28D21H21/14
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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