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Preparation method and application of branched chain type wet strength agent

A wet strength agent and branched-chain technology, which is applied in the field of preparation of branched-chain wet strength agents, can solve the problems of entering white water, affecting the effective use rate and performance, and achieve good wet strength, excellent application performance and reaction temperature low effect

Active Publication Date: 2020-04-28
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional wet strength agent on the market is made by modifying a synthetic linear polymer with epichlorohydrin. From the molecular structure point of view, the one-dimensional diameter is very small, so a considerable part will enter during papermaking. White water affects its effective utilization rate and performance

Method used

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  • Preparation method and application of branched chain type wet strength agent
  • Preparation method and application of branched chain type wet strength agent
  • Preparation method and application of branched chain type wet strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of branched high performance wet strength agent:

[0025] Add 20 grams of bottom water, 180 grams of diethylenetriamine, 260 grams of adipic acid and 1.5 grams of citric acid into the reaction kettle, stir and react for 1 hour, add 1.5 grams of catalyst concentrated sulfuric acid, stir and react for 1 hour, and then continue to heat up React at 165°C (reaction temperature is set according to actual needs) for 6 hours, add dilution water after the water output reaches the designed amount, and dilute the polymer to a solid content of 50%. Take 160 grams of the polymer solution, add 400 grams of water, stir evenly, add 45 grams of epichlorohydrin, control the reaction temperature below 50°C for 6 hours, add 50% dilute sulfuric acid to terminate the reaction when the viscosity of the reaction solution reaches the designed viscosity , add water to adjust the solid content to 12.5%, and add acid or alkali to adjust the pH to 3.5.

Embodiment 2

[0027] Preparation of branched high performance wet strength agent:

[0028] Add 30 grams of bottom water, 190 grams of diethylenetriamine, 270 grams of adipic acid and 2 grams of citric acid into the reaction kettle, stir and react for 1 hour, add 1 gram of catalyst concentrated sulfuric acid, stir and react for 1 hour, and then continue to heat up React for 5 hours at 160°C (the reaction temperature is set according to actual needs). After the water output reaches the designed amount, add dilution water to dilute the polymer to a solid content of 55%. Take 150 grams of the polymer solution, add 450 grams of water, stir evenly, add 48 grams of epichlorohydrin, control the reaction temperature below 50 ° C for 5 hours, add 50% dilute sulfuric acid to terminate the reaction when the viscosity of the reaction solution reaches the designed viscosity , add water to adjust the solid content to 12.5%, and add acid or alkali to adjust the pH to 3.0.

Embodiment 3

[0030] Preparation of branched high performance wet strength agent:

[0031] Add 20 grams of bottom water, 180 grams of diethylenetriamine, 260 grams of adipic acid and 1 gram of pyromellitic acid into the reaction kettle, stir and react for 1 hour, add 1.5 grams of catalyst p-toluenesulfonic acid, and stir and react for 1 hour , and then continue to heat up to 165°C (the reaction temperature is set according to actual needs) and react for 6 hours. After the water output reaches the designed amount, add dilution water to dilute the polymer to a solid content of 50%. Take 160 grams of the polymer solution, add 400 grams of water, stir evenly, add 45 grams of epichlorohydrin, control the reaction temperature below 50 ° C for 6 hours, add acetic acid to terminate the reaction when the viscosity of the reaction solution reaches the designed viscosity, and add water to adjust Solid content to 12.5%, while adding acid or alkali to adjust the pH to 3.5.

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Abstract

The invention discloses a preparation method of a branched chain type wet strength agent, which specifically comprises the following steps: adding polybasic acid the weight of which accounts for 0.05-5% of the weight of polyethylene polyamine and which has the functionality of more than or equal to 3 into a polycondensation reaction system of dicarboxylic acid and the polyethylene polyamine for copolymerization, and then adding epoxy chloropropane for modification to obtain the branched chain type wet strength agent. The branched chain type wet strength agent provided by the invention has a highly branched structure and a high cation degree, has a very good retention rate in a use process, and has a use amount less than that of a common wet strength agent. Due to the dendritic structure, the wet strength agent and paper fibers can form a three-dimensional network structure more easily, and the obtained paper has better wet strength and wet strength retention rate.

Description

technical field [0001] The invention relates to the technical field of papermaking additives, in particular to a preparation method and application of a branched-chain wet strength agent. Background technique [0002] Wet strength agent is an important papermaking additive, which is widely used in napkins, toilet paper, wallpaper, cardboard, banknote paper, tea bag paper, fruit bag paper, cup paper and other paper types that require wet strength. There are many kinds of wet strength agents, including polyamide imide epichlorohydrin (PAE) type wet strength agent, urea-formaldehyde resin, melamine formaldehyde resin, polyethyleneimine, dialdehyde starch, etc., among which PAE type wet strength agent is the most used A wet strength agent. Compared with other types of wet strength agents, PAE wet strength agents have the advantages of no formaldehyde, environmental protection, low toxicity, and high performance. [0003] At present, PAE wet strength agents are generally synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08G69/44D21H17/55D21H21/20
CPCC08G69/48C08G69/44D21H17/55D21H21/20
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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