A kind of chlorine-free wet strength agent and preparation method thereof

A technology of wet strength agent and ether solvent, which is applied in the field of chlorine-free wet strength agent and its preparation, can solve the problems of poor paper wet strength effect, poor retention performance, wet strength and waterproofing, etc., to improve wet strength , good waterproof performance, enhanced water resistance

Active Publication Date: 2021-10-22
ZHEJIANG HENGDA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the technical problems that the traditional wet strength agent used alone has poor retention performance, poor paper wet strength effect, and inability to balance wet strength and waterproof; when the chlorine-free wet strength agent is used to increase paper humidity Strength, Water Resistance and Folding Endurance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] A kind of preparation method of chlorine-free wet strength agent of the present invention, comprises the following steps:

[0023] 1) According to 20-30:3-5:5-10, take polyvinyl polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer; The aliphatic vinyl monomer is added dropwise to the polyethylene polyamine respectively, and the dropping time is about 2-3 hours. After the dropping is completed, the reaction is continued for 1-2 hours to obtain component A.

[0024] 2) Mix epoxy resin and ether solvent according to 1:1-1.5 (including 20-30 parts of epoxy resin), and add it dropwise to component A at 40-60°C, and the dropping time is about 1- 3h, after dropping, continue to keep warm for 1-2h. Component B is obtained.

[0025] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether according to the ratio of 1-5:4-15 (including 0.5-3 parts of isocyanate), and then add it dropwise to component B, and the dropping time is about 0.5 -1h, con...

Embodiment 1

[0036] 1) According to 20:3.5:6, take polyethylene polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer; at 50°C, drop the cationic monomer and long-chain aliphatic vinyl monomer separately Add it to polyethylene polyamine, add it dropwise for about 2 hours, and continue to react for 1.5 hours after the drop is completed, to obtain component A.

[0037] 2) Mix epoxy resin and ether solvent at a ratio of 1:1 (including 20 parts of epoxy resin), and add it dropwise to component A at 50°C for about 2 hours. After dropping, continue the heat preservation reaction 1.5h. Component B is obtained.

[0038] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether evenly according to the ratio of 1:5 (including 1 part of isocyanate), and then add it dropwise to component B for about 0.5 hours. After dropping, continue React for 1 h, and then dilute with deionized water to a mass fraction of 20%, to obtain component C.

[0039]5) Raise the temperature o...

Embodiment 2

[0041] 1) Take polyethylene polyamine monomer, cationic monomer, and long-chain aliphatic vinyl monomer at a ratio of 25:4:10; at 60°C, drop the cationic monomer and long-chain aliphatic vinyl monomer separately Add it to polyethylene polyamine, add it dropwise for about 3 hours, and continue to react for 1.5 hours after the drop is completed, to obtain component A.

[0042] 2) Mix epoxy resin and ether solvent according to 1:1.25 (including 25 parts of epoxy resin), and add it dropwise to component A at 60°C for about 2.5 hours, and continue to keep warm after dropping Reaction 1h. Component B is obtained.

[0043] 4) Mix the isocyanate trimer and diethylene glycol dimethyl ether according to the ratio of 3:11 (including 2 parts of isocyanate), and then add it dropwise to component B. The dropping time is about 0.6h. After dropping, continue React for 2 hours, then dilute with deionized water to a mass fraction of 25%, to obtain component C.

[0044] 5) Raise the temperatu...

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PUM

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Abstract

The invention discloses a chlorine-free wet strength agent and a preparation method thereof. First, add cationic monomer and long-chain aliphatic vinyl monomer to polyethylene polyamine liquid, add epoxy resin after a period of reaction to continue the reaction, and then add a small amount of isocyanate trimer for multi-branched chain extension, when the system reaches After a certain viscosity, add deionized water to disperse, then add dropwise the mixture of epoxy resin and ether solvent, add deionized after the viscosity of the system reaches a certain level, and adjust the pH of the system to 3-4, you can get both Chlorine-free wet strength agent for water resistance and wet strength properties. The product does not use organic chlorine monomers in the synthesis process, which greatly improves the environmental protection performance of the product, and solves the common problems in the industry such as poor retention performance of traditional wet strength agents used alone, poor paper wet strength effect, and inability to balance wet strength and waterproof. Technical problem, when used for paper humidification strength, it can greatly improve paper wet strength, water resistance and folding endurance.

Description

technical field [0001] The invention relates to the field of paper wet strength agents, in particular to a chlorine-free wet strength agent and a preparation method thereof. Background technique [0002] Common wet strength agents include polyethyleneimine (PEI), urea-formaldehyde resin (UF), polyamide epichlorohydrin resin (PAE), etc., all of which have good wet strength effects, but also have some disadvantages, such as urea-formaldehyde resin (UF) and melamine formaldehyde resin (MF), although they were used the earliest time, they have been banned by various countries in recent years because they contain free formaldehyde, pollute the environment, and limit their application; dialdehyde starch (DAS) has been used earlier, but there are The emission of iodide, which causes great pollution to the environment, tends to decrease in usage. PAE has good wet strength effect, and the demand for it in various countries is increasing day by day, but broken paper is not easy to de...

Claims

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Application Information

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IPC IPC(8): D21H21/20D21H17/57
CPCD21H17/57D21H21/20
Inventor 伊财富杨菊红徐冰程亚洲廖寿华
Owner ZHEJIANG HENGDA NEW MATERIAL CO LTD
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