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Semi-aromatic polyamide PA11T and preparation method thereof

A technology for semi-aromatic polyamide and polyamide, which is applied in the field of semi-aromatic polyamide PA11T and its preparation, semi-aromatic polyamide and its preparation field, can solve problems such as unseen semi-aromatic polyamide and the like, and achieves less reaction equipment and synthesis steps. , stable performance, uniform material dispersion effect

Active Publication Date: 2015-08-05
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no relevant report on the synthesis of semi-aromatic polyamide by one-step method

Method used

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  • Semi-aromatic polyamide PA11T and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 16.6kg of terephthalic acid, 18.6kg of 1,11-undecanediamine and 23.5kg of water into the drum reactor, replace the air in the reactor with argon, then heat up to 100°C, pressure 0.2 MPa, adjust the pH of the solution to 7.0 with 1,11-undecanediamine, and stir for 0.5 hours. Then the temperature was raised to 180°C in stages, and the pressure in the reactor was kept at 1Mpa. After 2 hours of reaction, the water was drained and the pressure was lowered, and the pressure in the reactor was reduced to normal pressure within 0.5 hour. Raise the temperature to 210°C, evacuate until the pressure in the reactor is 20Pa, continue the reaction for 10 hours, cool down and discharge to obtain a semi-aromatic nylon PA11T product, the melting point of the polymer is 303°C, the relative viscosity is 1.61, and the tensile strength is 83MPa.

Embodiment 2

[0024] Add 16.6kg of terephthalic acid, 18.6kg of 1,11-undecanediamine and 52.8kg of water into the drum reactor, replace the air in the reactor with carbon dioxide, and then heat up to 160°C with a pressure of 0.7 MPa, adjust the pH of the solution to 7.5 with 1,11-undecanediamine, and stir for 60 minutes. Then the temperature was raised to 225° C., and the pressure in the reactor was kept at 2.5 MPa. After 2 hours of reaction, the water was drained and the pressure was lowered, and the pressure in the reactor was reduced to normal pressure within 1 hour. The temperature was raised to 245°C, the pressure in the reactor was evacuated to 80 Pa, the reaction was continued for 3 hours, the temperature was lowered and the material was discharged to obtain the semi-aromatic polyamide PA11T product. The melting point of the polymer is 303°C, the relative viscosity is 1.70, the tensile strength is 87MPa, and the notched impact strength is 4.5 kJ / m 2 .

Embodiment 3

[0026] Add 16.6kg of terephthalic acid, 18.6kg of 1,11-undecanediamine and 140.8kg of water into the drum reactor, replace the air in the reactor with nitrogen, then heat up to 200°C and keep the pressure 1.6 MPa, adjust the pH of the solution to 7.2 with 1,11-undecanediamine, and stir for 30 minutes. Then the temperature was raised to 240° C., and the pressure in the reactor was kept at 3Mpa. After 1 hour of reaction, the water was drained and the pressure was lowered, and the pressure in the reactor was reduced to normal pressure within 3 hours. Raise the temperature to 260°C, evacuate until the pressure in the reactor is 50Pa, continue the reaction for 2 hours, cool down and discharge to obtain a semi-aromatic nylon PA11T product, the melting point of the polymer is 303°C, the relative viscosity is 1.68, and the tensile strength is 85MPa.

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Abstract

The invention discloses a semi-aromatic polyamide PA11T and a synthetic method thereof and belongs to the technical field of high polymer material synthesis. The structure formula is shown in the description, wherein n is 10-200. The 1, 11-undecanedioic diamide and the terephthalic acid are taken as the raw materials and the synthetic process is finished in a drum type reaction kettle through a one-pot method. By adopting the method, the reaction devices and the synthetic steps are few, the reaction time is short, the polymerization temperature is low, and the method is pollution-free and suitable for the large-scale industrial production. The PA11T produced by the process is excellent in performance and has a good market prospect in the industries such as the electric products and the automobiles.

Description

technical field [0001] The invention relates to a semi-aromatic polyamide and a preparation method thereof, belonging to the technical field of polymer material synthesis. In particular, it relates to a semi-aromatic polyamide PA11T and a preparation method thereof. Background technique [0002] Semi-aromatic polyamide is prepared by polycondensation reaction of aliphatic diamine and aromatic dibasic acid or aromatic diamine and long carbon chain aliphatic dibasic acid. Compared with aliphatic polyamides, due to the introduction of aromatic ring structures into the main chain of polyamide molecules, the heat resistance and mechanical properties of polyamide products have been improved, and the water absorption has also been reduced to varying degrees. Compared with fully aromatic polyamides, its molecular main chain contains aliphatic chains, which improves molding processability and solubility, and has better cost performance. It is often used as engineering plastics, fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28
Inventor 刘民英赵清香付鹏崔喆张君强张振国
Owner ZHENGZHOU UNIV
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