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Preparation method of epoxy polyamide type paper making wet strength agent

A technology of epoxy polyamide and wet strength agent, applied in the direction of reinforcing agent addition, etc., can solve the problems of poor product quality controllability, poor product quality controllability, dark product color, etc., achieve good wet strength effect, reduce The effect of molecular branching reaction and tearing degree improvement

Active Publication Date: 2014-07-30
ZHEJIANG TRANSFAR WHYYON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional preparation process has problems such as high energy consumption and poor controllability of product quality.
For example, the patent CN102898643A introduced that the production of polyamide polyamine intermediates requires a high temperature of 150-180 ° C, which not only consumes high energy, but also usually leads to excessively dark colors of the product
In addition, in the usual synthesis process, the branching reaction produced by epichlorohydrin easily leads to poor controllability of the final product quality
These will have a negative impact on the final application of epoxy polyamide paper wet strength agent

Method used

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  • Preparation method of epoxy polyamide type paper making wet strength agent

Examples

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Effect test

Embodiment 1

[0018] 1) Synthesis of polyamide intermediate: Stir and mix 103 grams of diethylenetriamine and 202 grams of diethyl adipate, raise the temperature to 120°C, keep the temperature for 4 hours and then cool down, then add 208 grams of deionized water to obtain a polyamide intermediate body water solution.

[0019] 2) Add 600 grams of early stage water to the above polyamide intermediate aqueous solution, stir evenly, slowly add 105 grams of epichlorohydrin dropwise within 30 minutes, stir for 30 minutes, heat up to 30°C, and keep warm for 5 hours; then heat up to 45°C, Keep warm for 4 hours; finally add 20 grams of 1% hydrochloric acid to terminate the reaction, add 250 grams of late water after cooling down, and the resulting product is epoxy polyamide paper-making wet strength agent with a shear viscosity of 30 centipoise.

Embodiment 2

[0021] 1) Synthesis of polyamide intermediate: Stir and mix 146 grams of triethylenetetramine and 174 grams of dimethyl adipate, raise the temperature to 90°C, keep the temperature for 10 hours, then cool down, then add 246 grams of deionized water to obtain a polyamide intermediate body water solution.

[0022] 2) Add 450 grams of early stage water to the above polyamide intermediate aqueous solution, stir evenly, slowly add 135 grams of epichlorohydrin dropwise within 60 minutes, stir for 30 minutes, heat up to 45°C, and keep warm for 1 hour; then heat up to 85°C , keep warm for 0.5 hour; finally add 5 grams of 25% sulfuric acid to terminate the reaction, add 300 grams of later stage water after cooling down, the resulting product is epoxy polyamide papermaking wet strength agent, and the shear viscosity is 25 centipoise.

Embodiment 3

[0024] 1) Synthesis of polyamide intermediates: Stir and mix 116 grams of hexamethylenediamine and 194 grams of dimethyl terephthalate, heat up to 160°C, keep warm for 2 hours, then cool down, then add 275 grams of deionized water to obtain polyamide intermediates body water solution.

[0025] 2) Add 530 grams of early stage water to the above-mentioned polyamide intermediate aqueous solution, stir evenly, slowly add 90 grams of epichlorohydrin dropwise within 45 minutes, stir for 30 minutes, heat up to 35°C, and keep warm for 3 hours; then heat up to 65°C ℃, keep warm for 2 hours; finally add 15 grams of 10% nitric acid to terminate the reaction, add 160 grams of late water after cooling down, and the resulting product is an epoxy polyamide papermaking wet strength agent with a shear viscosity of 35 centipoise.

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Abstract

The invention discloses a preparation method of an epoxy polyamide type paper making wet strength agent. A conventional preparation process has the problems of high energy consumption, low product quality controllability and the like. The preparation method disclosed by the invention comprises the following steps: (1) mixing polyamine with dicarboxylic ester to have high-temperature condensation polymerization; (2) adding water and epoxy chloropropane into the above-mentioned product, and performing a multi-temperature staged reaction to obtain the epoxy polyamide type paper making wet strength agent. Compared with similar products, the epoxy polyamide type paper making wet strength agent prepared by the method disclosed by the invention has a good wet strength effect, and also has relatively-great improvement in paper dry tensile strength, breaking strength and tearing strength. The preparation method disclosed by the invention needs no addition of a catalyst and has the advantages of simple operation, low energy consumption and the like.

Description

technical field [0001] The invention relates to a preparation method of a papermaking wet strength agent, in particular to a preparation method of an epoxy polyamide papermaking wet strength agent. Background technique [0002] The strength of paper is formed by the strength and quantity of each hydrogen bond between fibers. When the paper is moistened by water, the force between fibers weakens or even disappears. Wet strength agents can interact with paper fiber molecules to resist moisture infiltration and give paper wet strength. Generally, wet strength agents need the following characteristics: first, they can undergo polymerization reactions, increase the mechanical strength of paper, and protect the direct connection between fibers and fibers; second, they have cationic functional groups that can combine with fiber anionic groups. ; Third, it is water-soluble to ensure that it is evenly distributed in the paper during the wet end process; fourth, it can form a network...

Claims

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Application Information

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IPC IPC(8): C08G59/10C08G69/26D21H21/20
Inventor 魏任重梁福根朱超宇许夕峰谢占豪漆智鹏
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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