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Active diluent modified paper wet strength agent and preparation method thereof

A technology of active diluent and wet strength agent, applied in the direction of paper, reinforcement addition, papermaking, etc., can solve the problem that the wet strength effect of paper does not meet the production requirements, the content of adsorbable organic halide increases, the degree of crosslinking, the molecular weight Low problems, to prevent swelling and water absorption, stable properties, and increase cross-linking activity

Inactive Publication Date: 2012-03-07
ZHEJIANG HEXIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unmodified PAE has low crosslinking degree, low molecular weight, and poor flow performance. It is still unsatisfactory for some papers that require high wet strength. The content of adsorbable organic halide (AOX) increases; and it will bring many adverse effects to the papermaking, such as the pulp is prone to bubbles and flocculation, it is difficult to peel off the paper, the uniformity of the paper is poor, and the rigidity is low, etc.
[0006] In order to improve the cross-linking degree of PAE, Chinese patent ZL 200810018397.1 discloses a method for preparing a silicone modified paper moisturizing strength agent, and a Chinese patent application with publication number CN 101392478A discloses an epoxy cross-linking modification The preparation method of paper moistening strength agent, the performance of the modified PAE prepared by these two methods has been improved to varying degrees, but it still has not reached a very ideal state, and new modification methods need to be studied to further improve The performance of modified PAE

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Diethylenetriamine and adipic acid were added into a dry reactor at a molar ratio of 0.9:1, heated to 150°C, kept for 5 hours, cooled naturally to 120°C, diluted with deionized water to a solid content of 50%, measured The viscosity is 300mPa.s to obtain the intermediate polyamide polyamine solution of the wet strength agent; then the intermediate polyamide polyamine solution, epichlorohydrin and reactive diluent 622 are uniformly mixed in a mass ratio of 100:25:50 , add deionized water to dilute the system to a solid content of 25%, react at 60°C for 4 hours, when the viscosity of the system reaches 30mPa.s, stop heating, dilute with deionized water to a solid content of 13%, adjust the pH value to 2.3 with hydrochloric acid , You can get PAE paper wet strength agent modified by epoxy reactive diluent.

Embodiment 2

[0032] Diethylenetriamine and adipic acid were added into a dry reactor at a molar ratio of 1.2:1, heated to 190°C, kept for 4 hours, added deionized water to dilute to a solid content of 50%, and the measured viscosity was 545mPa.s, To obtain the intermediate polyamide polyamine solution of the wet strength agent; then mix the intermediate polyamide polyamine solution, epichlorohydrin and reactive diluent X-632 in a mass ratio of 100:15:80, and then add deionized Dilute the system with water to a solid content of 25%, and react at 70°C for 2 hours. When the viscosity of the system reaches 50mPa.s, stop heating, dilute with deionized water to a solid content of 12%, and adjust the pH value to 4.0 with sulfuric acid to obtain Epoxy reactive diluent modified PAE paper wet strength agent.

Embodiment 3

[0034] Diethylenetriamine and adipic acid were added into a dry reactor at a molar ratio of 1:1, heated to 165° C., kept for 6 hours, added deionized water to dilute to a solid content of 50%, and the measured viscosity was 450 mPa.s. Obtain wet strength agent intermediate polyamide polyamine solution; Then this intermediate polyamide polyamine solution, epichlorohydrin and reactive diluent 662 are mixed uniformly by the mass ratio of 100:30:30, add deionized water to Dilute the system to a solid content of 25%, and react at 50°C for 6 hours. When the viscosity of the system reaches 25mPa.s, stop heating, dilute with deionized water to a solid content of 12.5%, and adjust the pH value to 3.2 with nitric acid to obtain epoxy Reactive diluent modified PAE paper wet strength agent.

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Abstract

The invention discloses a paper wet strength agent, which is polyamide polyamine epoxy chloropropane resin modified by an active diluent, wherein the active diluent is an epoxy active diluent with at least two functionality degrees. The retention rate of the paper wet strength agent is greatly improved; the paper wet strength agent not only improves the wet strength of paper, but also increases the physical properties of folding strength, tensile strength, dry strength and the like of the paper; and the wet strength agent can be preserved for long time without generating bubbles, flocculationand the like. The invention also discloses a preparation method for the paper wet strength agent. An organic solvent is not used during preparation, and no free formaldehyde is released; and the preparation method can reduce the consumption of epoxy chloropropane and reduce the organic chlorine content of the effluent, is friendly to the environment and the human health, requires simple operation, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the field of paper wet strength agents in fine chemicals, in particular to an active diluent modified paper wet strength agent 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 wet strength of paper under wet conditions. Under normal circumstances, when no additives are added, the paper is wetted and its strength is only 5%-10% of the dry strength. After adding a wet strength agent, the paper can mostly maintain the strength of 20%-40% of the original dry strength. . [0003] Paper wet strength agents can be divided into two types: permanent and temporary. Temporary paper wet strength agents are mostly used in paper products that are short-term and discarded after use;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/20D21H17/55C08G59/50
Inventor 裴金东陈冬平
Owner ZHEJIANG HEXIN TECH
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