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Low-chlorine wet strength agent and preparation method thereof, and application in living paper

A wet strength agent, life-saving technology, applied in the direction of special paper, strengthening agent addition, textiles and papermaking, etc., to achieve the effect of reducing the cost of technological transformation, reducing the content of organic chlorine, and meeting strict standards

Pending Publication Date: 2021-04-09
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no report of using diethylenediamine with a six-membered ring structure as a raw material to prepare PAE papermaking wet strength agent

Method used

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  • Low-chlorine wet strength agent and preparation method thereof, and application in living paper
  • Low-chlorine wet strength agent and preparation method thereof, and application in living paper
  • Low-chlorine wet strength agent and preparation method thereof, and application in living paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of low chlorine wet strength agent:

[0027] Mix 102.3 grams (0.7mol) of adipic acid and 68.9 grams (0.8mol) of diethylenediamine, raise the temperature to 135°C, keep warm for 30 minutes, then raise the temperature to 175°C, keep warm for 4 hours, then cool down, then add 220g of deionized water to obtain a polyamide polyamine prepolymer aqueous solution. Add 1000 grams of deionized water to the above polyamide prepolymer aqueous solution, stir evenly, slowly add 92.52 grams (1 mol) of epichlorohydrin dropwise at room temperature, stir for 10 minutes, then raise the temperature to 50°C, keep the temperature for 2 hours, and then heat up to 60°C, keep warm for 3.5 hours, add 15 grams of sulfuric acid as a terminator, and add 850 grams of later water, keep warm at 40°C for 30 minutes, cool down after the reaction, the product obtained is a low chlorine wet strength agent, and the shear viscosity is 35 centipoise .

Embodiment 2

[0029] Preparation of low chlorine wet strength agent:

[0030] Mix 102.3 grams (0.7mol) of adipic acid and 60.3 grams (0.7mol) of diethylenediamine, heat up to 135°C, keep warm for 30 minutes, then heat up to 175°C, keep warm for 4 hours, then cool down, then add 200g of deionized water to obtain a polyamide polyamine prepolymer aqueous solution. Add 950 grams of deionized water to the above polyamide prepolymer aqueous solution, stir evenly, slowly add 92.52 grams (1 mol) of epichlorohydrin at room temperature, stir for 10 minutes, then raise the temperature to 50°C, keep the temperature for 2 hours, and then heat up to 60°C, keep warm for 3.5 hours, add 14 grams of sulfuric acid as a terminator, and add 830 grams of late water, keep warm at 40°C for 30 minutes, cool down after the reaction, the product obtained is a low chlorine wet strength agent, and the shear viscosity is 36 centipoise .

Embodiment 3

[0032] Preparation of low chlorine wet strength agent:

[0033] Mix 102.3 grams (0.7mol) of adipic acid and 77.5 grams (0.9mol) of diethylenediamine, heat up to 138°C, keep warm for 30 minutes, then heat up to 177°C, keep warm for 4 hours, then cool down, and then add 240g of deionized water to obtain a polyamide polyamine prepolymer aqueous solution. Add 1020 grams of deionized water to the above polyamide prepolymer aqueous solution, stir evenly, slowly add 92.52 grams (1 mol) of epichlorohydrin dropwise at room temperature, stir for 10 minutes, then raise the temperature to 50°C, keep the temperature for 2 hours, and then heat up to 60°C, keep warm for 3.5 hours, add 14 grams of sulfuric acid as a terminator, and add 880 grams of later water, keep warm at 40°C for 30 minutes, cool down after the reaction, the product obtained is a low chlorine wet strength agent, and the shear viscosity is 35 centipoise .

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Abstract

The invention discloses a low-chlorine wet strength agent. The preparation method of the low-chlorine wet strength agent comprises the following steps: carrying out condensation polymerization on binary acid and diethylenediamine to synthesize a polyamide prepolymer, then slowly adding epoxy chloropropane, carrying out sufficient reaction, and after the reaction is finished, adding acid to terminate the reaction so as to obtain the low-chlorine wet strength agent. According to the invention, diethylenediamine with a six-membered ring structure is adopted to replace common chain structure polyethylene polyamine to react with binary acid to obtain a polyamide prepolymer, and then the polyamide prepolymer reacts with epoxy chloropropane to prepare the wet strength agent, so that the content of organochlorine in the wet strength agent can be remarkably reduced without other additional processes or adding a dechlorination reagent; and the wet strength agent is applied to living paper, and can meet the strict standard of high-quality living paper on residual organochlorine content.

Description

technical field [0001] The invention relates to the technical field of wet-strength agents, in particular to a preparation method of a low-chlorine wet-strength agent and its application in household paper. Background technique [0002] For a long time, the application of polyamide polyamine epichlorohydrin (PAE) wet strength agent in the paper industry is very common. For paper types such as decorative base paper, banknote paper, printed paper, household paper, food packaging paper, etc., due to the wet strength Higher requirements for wet strength agents are indispensable. However, in the production process of PAE type wet strength agents, due to the side reaction of epichlorohydrin hydrolysis, organic chlorine 1,3-dichloro-2-propanol (DCP) is produced. and 3-chloro-1,2-propanediol (MCPD), which are toxic and endanger human health. Therefore, controlling the residual organic chlorine content of wet strength agents within the requirements is an inevitable development direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H21/20D21H17/55C08G69/48
CPCD21H27/005D21H21/20D21H17/55C08G69/48
Inventor 施晓旦王丽敏杨迪
Owner SHANGHAI DONGSHENG NEW MATERIALS
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