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Semi-aromatic polyamide resin and preparation method thereof

A polyamide resin and semi-aromatic technology, which is applied in the field of semi-aromatic polyamide resin and its preparation, can solve the problems of inability to prepare by polyamide polymerization process, difficult to form thin walls, easy to warp products, etc., and achieve excellent fluidity , Low water absorption, good mechanical properties

Inactive Publication Date: 2017-11-24
WUXI YINDA NYLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The melting point of PA9T exceeds 300°C, and its fluidity is poor, so it cannot be prepared by conventional polyamide polymerization process
At the same time, it is not easy to form thin walls during injection molding, and the molded products are easy to warp

Method used

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  • Semi-aromatic polyamide resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Drop into 2.02kg sebacic acid, 20g stearic acid, 5g phosphoric acid in the jacketed reaction kettle that is provided with agitator, partial condenser, cooler, thermometer, dropping tank and nitrogen inlet pipe. Feed inert gas into the reactor, remove the air in the reactor, and maintain the pressure of the reactor at 0.2Mpa. Heat the reaction kettle to raise the temperature of the reaction kettle to 240° C., start stirring, and the stirring speed is 60 rpm. Then slowly add molten p-xylylenediamine to the reactor while slowly raising the temperature of the reactor to 290°C. The dropwise addition took 120 minutes. During the dropwise addition process, the pressure of the reactor was maintained at 0.2MPa, and the generated water was discharged out of the reaction system through a dephlegmator and a cooler. The temperature of the partial condenser is controlled in the range of 140-150°C. After adding 1.36 kg of p-xylylenediamine, the addition was stopped. Slowly reduce ...

Embodiment 2

[0035] Put 2.30kg of dodecanedioic acid, 20g of stearic acid, and 5g of phosphorous acid into a jacketed reaction kettle equipped with agitator, partial condenser, cooler, thermometer, dropping tank and nitrogen inlet pipe. Feed inert gas into the reactor, remove the air in the reactor, and maintain the pressure of the reactor at 0.3MPa. The reaction kettle was heated to raise the temperature of the reaction kettle to 230° C., and the stirring was started at a stirring speed of 60 rpm. Then slowly add molten p-xylylenediamine to the reactor while slowly raising the temperature of the reactor to 290°C. The dropwise addition took 120 minutes. During the dropwise addition process, the pressure of the reactor was maintained at 0.3 MPa, and the generated water was discharged out of the reaction system through a dephlegmator and a cooler. The temperature of the partial condenser is controlled in the range of 140-150°C. After adding 1.36 kg of p-xylylenediamine, the addition was s...

Embodiment 3

[0037] 2.58kg tetradecanedioic acid, 20g stearic acid, and 5g sodium hypophosphite were dropped into a jacketed reaction kettle equipped with agitator, partial condenser, cooler, thermometer, dropping tank and nitrogen inlet pipe. Feed inert gas into the reactor, remove the air in the reactor, and maintain the pressure of the reactor at 0.4MPa. The reaction kettle was heated to raise the temperature of the reaction kettle to 220° C., and the stirring was started at a stirring speed of 60 rpm. Then slowly add molten p-xylylenediamine to the reactor while slowly raising the temperature of the reactor to 290°C. The dropwise addition took 120 minutes. During the dropwise addition process, the pressure of the reactor was maintained at 0.4 MPa, and the generated water was discharged out of the reaction system through a dephlegmator and a cooler. The temperature of the partial condenser is controlled in the range of 140-150°C. After adding 1.36 kg of p-xylylenediamine, the additio...

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Abstract

The invention relates to semi-aromatic polyamide resin and a preparation method thereof, and belongs to the technical field of organic synthesis. The semi-aromatic polyamide resin comprises a p-xylylenediamine structural unit, a diacid unit of linear aliphatic diacid which has carbon atoms of 10 to 18, and a fatty acid unit with a carbon atom number which is greater than 18; the semi-aromatic polyamide resin is prepared by carrying out catalytic reaction on the linear aliphatic diacid and a raw material diamine under the condition of a polymerization catalyst. The polyamide resin provided by the invention has good flowability, good temperature resistance, low water absorption rate and good mechanical performance, and is especially suitable for various electronic parts and surface mounting parts, which have high heat resistance and low water absorptivity, small-sized thin-wall molded products which need a high crystallization speed, a high final crystallization degree and low water absorptivity, and automobile parts including automobile headlamp reflection plates, engine peripheral parts and the like, which need heat resistance and rigidity.

Description

technical field [0001] The invention relates to a semi-aromatic polyamide resin and a preparation method thereof, in particular to a semi-aromatic polyamide resin with excellent fluidity, good temperature resistance, low water absorption and good mechanical properties and its preparation, belonging to organic synthesis technology field. Background technique [0002] The crystalline aliphatic polyamide resins represented by nylon 6 and nylon 66 have excellent toughness, chemical resistance, electrical properties and are easy to be melt-molded. They are widely used in the fields of chemical industry, electrical appliances, automobiles and other machinery manufacturing. However, in some fields that require high temperature resistance, such as automotive engines, exhaust pipes, and semiconductor surface packaging, due to the low melting point of nylon 6 and nylon 66, insufficient heat resistance and easy water absorption, the size of the molded material Poor stability and reduc...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28
CPCC08G69/26C08G69/28
Inventor 陈尚标沈俊毅胡瑞莉殷炼伟
Owner WUXI YINDA NYLON
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