Preparation method of environment-friendly low-chlorine wet strength agent

A wet strength agent and environmental protection technology, applied in the field of preparation of environmentally friendly low chlorine wet strength agent, to achieve the effects of reduced organic chlorine content, excellent application performance and good retention rate

Active Publication Date: 2021-04-13
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 hydroxypropyl guar g

Method used

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  • Preparation method of environment-friendly low-chlorine wet strength agent
  • Preparation method of environment-friendly low-chlorine wet strength agent
  • Preparation method of environment-friendly low-chlorine wet strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027](1) 132 grams of water under the reactor, 260 grams of adipic acid and 1.5 grams of citric acid, stirred at the stirring, and then add 180 grams of dicene triamine, stirred for 1 hour, add catalyst concentrated sulfuric acid 1.5 Gram, then stirred for 1 hour, then continued to heat up to 165 ° C (the reaction temperature was set according to actual needs) for 5 hours, and then dilute water was added after the effluent was added, and the polymer was diluted to a solid content of 50%. Take 160 g of the polymer solution, 400 grams of water, stirred and uniform, and then slowly drip to add epoxyoxropane, 40 min, and after the dropwater is added, the reaction is 60 min at 30 ° C, and the reaction is 90 min, then The temperature is heated to 65 ° C, and the reaction liquid is added after the viscosity of the design viscosity is added, and the pH is 3.7 to obtain a polyamide epoxy resin;

[0028](2) Weigh 50 grams of hydroxypropyleproluacuachen addition to a three-mouth flask with a the...

Embodiment 2

[0031](1) 100 grams of kettate, 250 grams of adipate and 1.5 grams of citric acid were added to 250 grams of citric acid, and stirred at 181 grams of diethylene triamine, stirred for 1 hour, and added to the catalyst concentratic acid 1.2 Gram, then stirred for 1 hour, then continued to warm to 170 ° C (the reaction temperature was set according to actual needs) for 4 hours, and then the amount of water reached the designed amount, dilution is diluted to a solid content of 50%. 200 grams of the polymer solution was taken, 400 g of water was added, and 64 grams of epoxy chloropropane was added, and the dropwish was 60 min. After the dropwise addition, the reaction was 50 min, and the reaction was 60 min at 50 ° C, while the subtraction temperature 70 ° C, when the reaction liquid viscosity reaches the design viscosity, add 50% dilute sulfate to 3.5, and the acid is adjusted to 3.5 to obtain a polyamide epoxy resin;

[0032](2) Weigh 100 grams of hydroxypropyleprium gum to add a three-mo...

Embodiment 3

[0035](1) 80 grams of kettate water, 146 g of adipate and 1.0 grams of citric acid were added, and stirred on stirring, 103 grams of diethylene triamine was slowly added, stirred for 1 hour, and the catalyst concentrated sulfuric acid was added. 1.0 Gram, then stirred for 1 hour, then continued to heat up to 190 ° C (the reaction temperature was set according to actual needs) for 2 hours, and then the amount of water was added to the designed amount, and the polymer was diluted to a solid content of 50%. 200 grams of the polymer solution was taken, 400 g of water was added, and 56 g of epoxy chloropropane was added, and the dropped time was 50 min. After the dropwater was added, the reaction was reacted at 35 ° C for 45min, while the subtracking temperature 67 ° C, when the reaction liquid viscosity reached the design viscosity, 50% dilute sulfate was added to the reaction, the acid or base regulation pH to 4.0 was added to obtain a polyamide epoxy resin.

[0036](2) Weighing 75 hydrox...

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PUM

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Abstract

The invention discloses a preparation method of an environment-friendly low-chlorine wet strength agent. The method comprises the following steps: adding polybasic acid which accounts for 0.05-5% of the weight of polyethylene polyamine and has the functionality greater than or equal to 3 into a polycondensation reaction system of dicarboxylic acid and polyethylene polyamine for copolymerization; then adding epoxy chloropropane for modification to obtain polyamide epoxy resin; and then mixing with enzymolysis hydroxypropyl guar gum to obtain the environment-friendly low-chlorine wet strength agent. A branched structure is formed during first-stage polymerization, the branching degree is high, and the reaction temperature in the polymerization stage is low; and mixed reaction with a natural environment-friendly enzymolysis guar gum derivative is carried out, residual epichlorohydrin in polyamide epoxy resin is consumed, and thus the final product has low organochlorine content and more excellent application performance, and the obtained paper has better wet strength and wet strength retention rate.

Description

Technical field[0001]The present invention relates to the preparation of papermaking wet strong agent, and more particularly to the preparation method of environmentally friendly low chlorine.Background technique[0002]Wet strength is referred to that after the paper is wetted, its fiber network structure still has mechanical strength. The wet strength of the paper depends not only on the fiber's own characteristics, but also depends on the number of nodes of the fibers and the fibers and the intensity. As the material of the paper, the cellulose has a hydrophilic character. After the paper is dipped, the cellulose will lose its corresponding strength. During the industrial papermaking process, if the wet strength agent is added, the wet strength of the paper can be significantly improved. tensile strength. Add a variety of chemical aids in the papermaking formulation, which can promote the formation of wet fibers and ultimately improve the strength of the paper. The addition of a sm...

Claims

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Application Information

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IPC IPC(8): D21H21/20
CPCD21H21/20
Inventor 施晓旦李改霞尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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