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Application method of papermaking wet-strength agent

An application method and technology of wet strength agent, applied in the application field of papermaking wet strength agent, can solve the problems of paper product strength reduction, unfavorable environmental protection, PAE papermaking pollution, etc., to ensure the strength of paper products, reduce waste water pollution, weaken The effect of corrosion

Inactive Publication Date: 2014-05-21
王慧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of PAE is high. In order to save costs, the factory has been looking for alternatives to PAE, which reduces the strength of paper products and is not worth the candle.
At the same time, the pollution of PAE papermaking is relatively large, which is not conducive to the protection of the environment.
Although the modified PAE can improve the paper strength to a certain extent, the specific addition amount is not yet clear.

Method used

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  • Application method of papermaking wet-strength agent
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  • Application method of papermaking wet-strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] See the 1# experiment in Table 1. Dissolve diethylenetriamine in water to make a 30% solution, then add adipic acid. At this time, the temperature rises automatically, and the water evaporates. The temperature can reach 110-120°C, and then add Modifier M, continue heating to 140-180°C under stirring. After a certain period of time, the heating can be stopped. Slowly add water, lower the temperature to 70°C, add epichlorohydrin to the above intermediate, react for about 2 hours, and keep the pH of the system at 7.5-8.5. When the viscosity reaches the requirement, immediately add hydrochloric acid to adjust the pH and terminate the reaction. In 1#, the mass ratio of adipic acid, diethylenetriamine and modifier M is 7:6:2. The molar ratio between polyamide polyamine and epichlorohydrin is 1:1.4.

[0020] See the 1# experiment in Table 2, using the modified PAE wet strength agent prepared by 1# in Table 1, with a solid content of 12.5%, diluted with water to 1:10, and add...

Embodiment 2

[0022] See the 2# experiment in Table 1. Dissolve diethylenetriamine in water to make a 30% solution, and then add adipic acid. At this time, the temperature rises automatically, and the water evaporates. The temperature can reach 110-120°C, and then add Modifier M, continue heating to 140-180°C under stirring. After a certain period of time, the heating can be stopped. Slowly add water, lower the temperature to 70°C, add epichlorohydrin to the above intermediate, react for about 2 hours, and keep the pH of the system at 7.5-8.5. When the viscosity reaches the requirement, immediately add hydrochloric acid to adjust the pH and terminate the reaction. In 1#, the mass ratio of adipic acid, diethylenetriamine and modifier M is 7:5:2. The molar ratio between polyamide polyamine and epichlorohydrin is 1:1.4.

[0023] See the 2# experiment in Table 2, using the modified PAE wet strength agent prepared by 1# in Table 1, with a solid content of 12.5%, diluted with water to 1:10, and...

Embodiment 3

[0025] See experiment 3# in Table 1. Dissolve diethylenetriamine in water to make a 30% solution, and then add adipic acid. At this time, the temperature rises automatically, and the water evaporates. The temperature can reach 110-120°C, and then add Modifier M, continue heating to 140-180°C under stirring. After a certain period of time, the heating can be stopped. Slowly add water, lower the temperature to 70°C, add epichlorohydrin to the above intermediate, react for about 2 hours, and keep the pH of the system at 7.5-8.5. When the viscosity reaches the requirement, immediately add hydrochloric acid to adjust the pH and terminate the reaction. In 1#, the mass ratio of adipic acid, diethylenetriamine and modifier M is 7:4:2. The molar ratio between polyamide polyamine and epichlorohydrin is 1:1.4.

[0026] See the 3# experiment in Table 2, using the modified PAE wet strength agent prepared by 1# in Table 1, with a solid content of 12.5%, diluted with water to 1:10, and add...

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Abstract

The invention relates to an application method of a papermaking wet-strength agent, and belongs to the field of pulping and papermaking. The method comprises direct addition of the wet strength agent into slurry, the method is characterized in that: the adding amount of the wet strength agent accounts for 0.25-0.75% by mass of the absolutely-dry slurry. A preparation method of the wet strength agent comprises the following steps: firstly, dissolving diethylenetriamine into water for preparing a solution with the mass percentage concentration of 30%, then adding adipic acid to the solution, then adding a modifier M into the solution to generate intermediate polyamide polyamine, and continuing to add epichlorohydrin into the intermediate solution; wherein the mass ratio of adipic acid to diethylenetriamine to modifier M is 7:4:2. The modified PAE (polyamide polyamine epichlorohydrin) wet strength agent of the invention can be directly added into the slurry, by precise control of adding amount, the paper strength can be ensured, meanwhile the cost is reduced, and the method can reduce wastewater pollution, and reduce corrosion to papermaking equipment.

Description

technical field [0001] The invention belongs to the field of pulp and papermaking, and in particular relates to an application method of a papermaking wet strength agent. Background technique [0002] Cationic polyamide-epichlorohydrin resin (PAE) is the most commonly used wet strength agent in papermaking, which has the characteristics of high efficiency and wide application range. In addition to increasing the wet strength of paper, PAE can also increase the dry strength to varying degrees, and can be used as a retention agent for fillers in the papermaking process, a filter aid for increasing paper output, etc. However, the price of PAE is relatively high. In order to save costs, factories have been looking for alternatives to PAE, which reduces the strength of paper products and is not worth the candle. At the same time, PAE papermaking is more polluting, which is not conducive to environmental protection. Although the modified PAE can improve the paper strength to a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/20D21H17/55
Inventor 王慧
Owner 王慧
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