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Method for preparing a reinforcing agent special for ultrafine glass fiber paper and applications of reinforcing agent

A technology of ultra-fine glass fiber and reinforcing agent, applied in the direction of reinforcing agent addition, etc., can solve problems such as poor effect, difficulty in process control, complex synthesis process, etc., and achieve the effect of improving strength, obvious strengthening effect, and simple synthesis process

Inactive Publication Date: 2013-11-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The synthesis process of some existing reinforcing agents is relatively complicated, and there is a certain degree of difficulty in process control, and the effect is not good when used in the production of ultrafine glass fiber paper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Polycondensation synthesis of intermediate prepolymer: Mix adipic acid, polyethylene polyamine and p-toluenesulfonic acid in a molar ratio of 1:1.5:1.02, and use an oil bath to control the temperature at 150°C. Continuous reaction for 3 hours to synthesize polyamide prepolymer, p-toluenesulfonic acid as catalyst;

[0018] (2) Epoxidation reaction to synthesize the final product: Add distilled water to the prepolymer synthesized in step (1), adjust the solid content to 25%, add methacrylic acid, methacrylic acid and adipic acid after cooling down to 40°C The molar ratio is 1:10. After stirring evenly, slowly add epichlorohydrin dropwise under constant pressure until its molar weight is 1.5 times that of adipic acid. Heat and keep warm to keep the temperature between 65-75°C for 2 hours. Keep warm for 1 Measure the viscosity every 10 minutes after 1 hour, adjust the pH value to 3-5 when the viscosity reaches 100-150mPa·s to stop the reaction, and obtain the special st...

Embodiment 2

[0021] (1) Polycondensation synthesis of the intermediate prepolymer: Mix adipic acid, polyethylene polyamine and p-toluenesulfonic acid in a molar ratio of 1:1.5:1.02, and use an oil bath to control the temperature at 160°C. Continuous reaction for 2.5 hours to synthesize polyamide prepolymer, p-toluenesulfonic acid as catalyst;

[0022] (2) Epoxidation reaction to synthesize the final product: Add distilled water to the prepolymer synthesized in step (1), adjust the solid content to 35%, add methacrylic acid, methacrylic acid and adipic acid after cooling down to 40°C The molar ratio is 1:10. After stirring evenly, slowly add epichlorohydrin dropwise under constant pressure until its molar weight is 1.5 times that of adipic acid. Heat and keep warm to keep the temperature between 65-75°C for 2 hours. Keep warm for 1 Measure the viscosity every 10 minutes after 1 hour, adjust the pH value to 3-5 when the viscosity reaches 100-150mPa·s to stop the reaction, and obtain the spec...

Embodiment 3

[0025] (1) Polycondensation synthesis of the intermediate prepolymer: Mix adipic acid, polyethylene polyamine and p-toluenesulfonic acid in a molar ratio of 1:1.5:1.02, and use an oil bath to control the temperature at 175°C. Continuous reaction for 2 hours to synthesize polyamide prepolymer, p-toluenesulfonic acid as catalyst;

[0026] (2) Epoxidation reaction to synthesize the final product: add distilled water to the prepolymer synthesized in step (1), adjust the solid content to 45%, add methacrylic acid, methacrylic acid and adipic acid after cooling down to 40°C The molar ratio is 1:10. After stirring evenly, slowly add epichlorohydrin dropwise under constant pressure until its molar weight is 1.5 times that of adipic acid. Heat and keep warm to keep the temperature between 65-75°C for 2 hours. Keep warm for 1 Measure the viscosity every 10 minutes after 1 hour, adjust the pH value to 3-5 when the viscosity reaches 100-150mPa·s to stop the reaction, and obtain the specia...

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Abstract

The invention provides a method for preparing a reinforcing agent special for ultrafine glass fiber paper, comprising: uniformly mixing adipic acid, polyethylene polyamine and p-toluenesulfonic acid according to a mol ratio of 1:1.5:1.02, controlling temperature, continuously reacting to synthesize a polyimide prepolymer, adding distilled water into the synthesized polyamide polymer, adding methacrylic acid after cooling, dropping chloropropylene oxide in constant pressure after uniformly stirring, heating, insulating, regulating the pH value between 3-5 when viscosity reaches 100-150mPa*s, and ending the reaction to obtain the reinforcing agent special for ultrafine glass fiber paper. The reinforcing agent can be used for making the ultrafine glass fiber paper with pulp. The method has advantages of simple synthesis process, easy control of conditions, and high purity of the reaction synthesis product. The reinforcing agent special for making ultrafine glass fiber paper has an obvious reinforcing effect. When a small amount of the synthesized reinforcing agent, about 0.5-3% is added, tensile strength of the ultrafine glass fiber paper can be raised 150-230%. The strength of the ultrafine glass fiber paper is raised, and the reinforcing agent is convenient for using.

Description

technical field [0001] The invention relates to a preparation method and application of a special strengthening agent for superfine glass fiber paper. Background technique [0002] The strength of paper in papermaking comes from the interaction between fibers. During the forming process of the paper sheet, the swollen fibers are interwoven and the surfaces are in close contact. After drying and dehydration, hydrogen bonding forces are generated between adjacent surfaces of the fibers, and the paper obtains dry strength. . When the paper is rewetted, the bonding force between the fibers is weakened or destroyed, and the paper loses or partially loses its strength. Compared with natural plant fibers, glass fibers are relatively slender, have a large aspect ratio, and the fiber surface is smooth and charged. They cannot form hydrogen bonds and intertwine like plant fibers. It is difficult to make paper using glass fibers alone. The forming of ultra-fine glass fiber paper need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48D21H21/18
Inventor 王海毅李杰吴养育赵红霞唐永科刘彬彬
Owner SHAANXI UNIV OF SCI & TECH