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Wet strength agent for paper making and preparation thereof

A technology of wet strength agent and aldehyde crosslinking agent, which is applied in the field of wet strength agent and its preparation, can solve the problems of increased wet strength, pulp bubbles, poor paper sheet uniformity, etc., and achieves improved retention performance, retention rate increase, improve the effect of dry pull

Active Publication Date: 2008-12-24
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when PAE is used alone, the wet strength does not increase much, and it will bring many adverse effects to the papermaking, such as the pulp is prone to air bubbles and flocculation, it is difficult to peel off the paper, and the uniformity of the paper is poor, especially not suitable for Production of special paper such as banknote paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The wet strength agent for papermaking in this embodiment is the polyamide epichlorohydrin (modified PAE) modified by the crosslinking agent glutaraldehyde, and its molecular chain has a three-dimensional network structure; wherein the polyamide epichlorohydrin ( PAE) is a polyamide synthesized by the polycondensation reaction of adipic acid and diethylenetriamine and then epoxidized with epichlorohydrin.

[0027] The wet strength agent for papermaking in this embodiment is prepared by using adipic acid, diethylenetriamine, epichlorohydrin and glutaraldehyde as main raw materials through a method comprising the following main steps:

[0028] (1) Synthesis of intermediates through polycondensation reaction: under the condition of 140°C, react adipic acid and diethylenetriamine under the action of catalyst p-toluenesulfonic acid for 10 hours to synthesize intermediate polyamides, wherein adipic acid, The mass ratio of diethylenetriamine and p-toluenesulfonic acid is 1:1:0...

Embodiment 2

[0032] The papermaking wet strength agent of this embodiment is the polyamide epichlorohydrin (modified PAE) modified by the crosslinking agent adipaldehyde, and its molecular chain has a three-dimensional network structure; wherein the polyamide epichlorohydrin ( PAE) is a polyamide synthesized by polycondensation reaction of malonic acid and triethylenetetramine and then epoxidized with epichlorohydrin.

[0033] The wet strength agent for papermaking in this embodiment is prepared by using malonic acid, triethylenetetramine, epichlorohydrin and adipaldehyde as main raw materials through a method comprising the following main steps:

[0034] (1) Synthesis of intermediates by polycondensation reaction: under the condition of 150°C, react malonic acid and triethylenetetramine under the action of p-toluenesulfonic acid for 8 hours to synthesize intermediate polyamides, in which malonic acid, triethylenetetramine The mass ratio of ethylene tetramine to p-toluenesulfonic acid is 1...

Embodiment 3

[0038]The wet strength agent for papermaking in this embodiment is polyamide epichlorohydrin (modified PAE) modified by crosslinking agent sebaldehyde, and its molecular chain has a three-dimensional network structure; wherein polyamide epichlorohydrin ( PAE) is the polyamide synthesized by the polycondensation reaction of sebacic acid and tetraethylenepentamine, and then epoxidized with epichlorohydrin.

[0039] The wet strength agent for papermaking in this embodiment is prepared by using sebacic acid, tetraethylenepentamine, epichlorohydrin and sebaldehyde as main raw materials through a method comprising the following main steps:

[0040] (1) Synthesis of intermediates by polycondensation reaction: Under the condition of 200 ° C, sebacic acid and tetraethylenepentamine were reacted for 2 hours under the catalytic action to synthesize intermediate polyamides, wherein sebacic acid, tetraethylenepentamine , The mass ratio of p-toluenesulfonic acid is 1: 1.2: 0.015; during the...

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PUM

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Abstract

The invention discloses a wet strengthening agent for making paper. The wet strengthening agent is PAE modified by an aliphatic twain-aldehyde compound crosslinking agent. A molecular chain has a three-dimensional net structure. The wet strengthening agent can be preserved for a long time and does not generate bubble or flocculation, etc. The application of the wet strengthening agent in paper production ensures that the paper has good flexibility resistance and wet strengthen. The invention also discloses a method for preparing the wet strengthening agent for making paper.

Description

technical field [0001] The invention relates to a wet strength agent used in the papermaking industry and a preparation method thereof. Background technique [0002] The wet strength of paper refers to the strength of a paper sheet when exposed to water or in a humid environment. Many paper products, especially industrial paper, require high wet strength, and the addition of wet strength agents can improve the strength of paper under wet conditions. Under normal circumstances, when no additives are added, the strength of the paper after being wet is only 5%-10% of the strength of the dry state. After adding a wet strengthening agent, the paper can mostly maintain 20%-40% of the original dry strength. . [0003] Paper wet strength agents can be divided into two types: permanent type and temporary type. The temporary type is mostly used in paper products that are short-term and discarded after use; the permanent type is usually used in corrugated cardboard and some special p...

Claims

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Application Information

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IPC IPC(8): D21H21/20
Inventor 田德卿沈一丁陈玉群李刚辉费贵强
Owner CHINA BANKNOTE PRINTING & MINTING
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