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Coating water-repellent agent and preparation method thereof

A water-resistant agent and coating technology, applied in the direction of reinforcing agent addition, etc., can solve the problems of high production and transportation costs, low solid content of products, low organic chlorine content, etc., to achieve increased solid content by weight, stable shape, and reduced Effect of organochlorine content

Inactive Publication Date: 2009-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the disadvantages of high organic chlorine content, low product solid content, and high production and transportation costs of the existing water-resistant agent polyamide polyurea epichlorohydrin resin aqueous solution, and provide a high solid content, Coating Water Repellent with Low Organic Chlorine Content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 0.2 mol of adipic acid into a four-necked flask equipped with a stirrer, thermometer, condenser and water separator, add 0.2 mol of diethylenetriamine, 2 mL of 10% sulfuric acid, start stirring, and raise the temperature to 120 ° C for 1 h. Continue to raise the temperature and control the temperature to react at 165°C for 100min. During the reaction process, the reaction water in the system is continuously separated, and the temperature is lowered to 80°C. Add 0.25mol of urea and 30mL of deionized water to the system, and keep the temperature at 100°C for 10h. When the temperature is lowered to 30°C, add 0.06mol epichlorohydrin and 15mL deionized water, keep the temperature at 30°C for 6 hours, then add 0.05mol of ethanolamine and raise the temperature to 45°C to continue the reaction for 6 hours, and adjust the pH value of the system to 7. Cool to normal temperature to obtain polyamide polyurea epichlorohydrin aqueous solution. The solution is a yellow transparent...

Embodiment 2

[0013] Add 0.2 mol of adipic acid into a four-necked flask equipped with a stirrer, thermometer, condenser and water separator, add 0.2 mol of diethylenetriamine, 1.5 mL of 15% acetic acid, start stirring, and raise the temperature to 120 ° C for 1 h , continue to raise the temperature and control the temperature to react at 175°C for 100min. During the reaction, the water generated by the reaction in the system is continuously separated, and the temperature is lowered to 80°C. Add 0.27mol of urea and 25mL of deionized water to the system, and keep the temperature at 90°C for 10h. When the temperature is lowered to 30°C, add 0.07mol epichlorohydrin and 15mol deionized water, keep the temperature at 30°C for 6 hours, then add 0.05mol of ethanolamine and raise the temperature to 55°C to continue the reaction for 6 hours, and adjust the pH of the system to 10% sulfuric acid 6.5, cooled to normal temperature to obtain polyamide polyurea epichlorohydrin aqueous solution. The soluti...

Embodiment 3

[0015] Add 0.2 mol of adipic acid into a four-necked flask equipped with a stirrer, thermometer, condenser and water separator, add 0.2 mol of diethylenetriamine, 2 mL of 10% sulfuric acid, start stirring, and raise the temperature to 120 ° C for 1 h. Continue to raise the temperature and control the temperature to react at 170°C for 100min. During the reaction, the reaction water in the system is continuously separated, and the temperature is lowered to 80°C. Add 0.285mol of urea and 20mL of deionized water to the system, and keep the temperature at 110°C for 10h. When the temperature is lowered to 30°C, add 0.08mol epichlorohydrin and 15mL deionized water, keep the temperature at 30°C for 6 hours, then add 0.05mol of ethanolamine and raise the temperature to 50°C to continue the reaction for 6 hours, adjust the pH of the system to 10% sulfuric acid 8. Cool to normal temperature to obtain polyamide polyurea epichlorohydrin aqueous solution. The solution is a yellow transparen...

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PUM

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Abstract

The invention discloses a coating water repellent agent and a preparation method thereof. The coating water repellent agent is a polyamide polyurea epichlorohydrin resin water solution with the solid content (mass content) of 50 percent to 60 percent, wherein, the mass percentage of organic chloride is less than 0.1 percent, the pH is equal to 6 to 8, viscosity is 150mP question mark s to 450mP question mark s. 10 percent of acid is added as a reaction additive in the reaction, which causes the product weight solid content generated at the final stage of the reaction and the coating property to be improved. Furthermore, low temperature reaction is adopted during the cross-linked reaction process with epichlorohydrin, then slight heating is carried out and ethanolamine is added for further reaction, thus reducing the organic chloride content of the generated byproduct, and reducing the organic chloride content of the whole product, which is kept at the level of less than 0.1 percent.

Description

technical field [0001] The invention relates to a water-resistant agent used in the papermaking industry and a preparation method thereof. Background technique [0002] The water-resistant agents used in papermaking technology are generally amino resins, the most typical being melamine formaldehyde resin. This kind of resin is used as a water repellent agent, which can improve the wet friction resistance and wet nap strength of coated paper, improve the printability of coated paper, and reduce the phenomenon of lint and powder shedding of coated paper. However, during the storage and use of this type of anti-water agent, a certain amount of formaldehyde will be released, which will pollute the environment and endanger human health. In addition, the paper and cardboard produced by using this kind of water-resistant agent need a certain period of time to mature after being off the machine. This is because it takes a long time for amino resins, especially melamine formaldehyd...

Claims

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Application Information

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IPC IPC(8): D21H21/20
Inventor 周涛魏盼中许仙波唐清
Owner CENT SOUTH UNIV
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