High-temperature resistant semi-aromatic nylon and its preparation method

A technology of semi-aromatic nylon and high temperature resistance, which is applied in the field of high temperature resistant semi-aromatic nylon and its preparation, which can solve the problems of complex reaction device, long reaction time, and difficulty in discharging materials, so as to improve devolatilization efficiency and mechanical properties , the effect of preventing decomposition

Active Publication Date: 2012-05-30
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the difficulty in devolatilization, long reaction time, complex reaction device, difficult discharge and inability to pelletize when preparing semi-aromatic nylon in the production of granulation, blending between different semi-aromatic nylons or blending with other nylons etc., the present invention provides a preparation method of high temperature resistant semi-aromatic nylon; the method has the characteristics of good devolatilization effect, short reaction time, convenient operation, high production efficiency and low cost, and the prepared semi-aromatic nylon has the viscosity High, good high temperature resistance, has obvious advantages in mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]55 parts of nylon 6T salt, 20 parts of nylon 6I salt, 10 parts of nylon 66 salt, 35 parts of deionized water, 0.5 part of benzoic acid, 0.2 part of sodium hypophosphite, 0.4 part of antioxidant 1098 and 0.1 part of auxiliary antioxidant 168. Add 0.2 parts of calcium stearate into the high-pressure stirring reaction kettle; after the raw materials are added to the reaction kettle, replace the air in the kettle with nitrogen for at least three times, and then pass in nitrogen at a pressure of 0.2MPa as a protective gas at 10°C per minute The heating rate is rapidly raised to 150°C, and the pressure is raised to 2.0MPa within 50 minutes, and the pressure is maintained. The reaction time is 1.5h; when a large amount of water vapor is generated in the reaction system, it is maintained by releasing the water in the kettle. The pressure is constant; the pressure is then reduced to normal pressure, and the temperature in the kettle is not higher than 280°C during the reaction. T...

Embodiment 2

[0053] 55 parts of nylon 6T salt, 20 parts of nylon 6I salt, 10 parts of nylon 6 salt, 35 parts of deionized water, 0.6 part of benzoic acid, 0.4 part of sodium hypophosphite, 0.5 part of antioxidant 1098 and 0.1 part of auxiliary antioxidant 168. Add 0.3 parts of calcium stearate, etc. into the high-pressure stirring reactor. After the raw materials are added to the reactor, replace the air in the reactor with nitrogen for at least three times, and then pass in nitrogen at a pressure of 0.5 MPa as a protective gas at 15 per minute. The heating rate of ℃ is rapidly raised to 180 ℃, and the pressure is raised to 2.5MPa within 50 minutes, and the pressure is maintained, and the reaction time is 2.5h; when a large amount of water vapor is generated in the reaction system, it is released by releasing the water in the kettle. Keep the pressure constant; then reduce the pressure to normal pressure. During the reaction, the temperature in the kettle is not higher than 280°C. The resu...

Embodiment 3

[0057] 55 parts of nylon 6T salt, 20 parts of nylon 6I salt, 8 parts of nylon 9T salt, 35 parts of deionized water, 0.8 part of benzoic acid, 0.8 part of sodium hypophosphite, 0.8 part of antioxidant 1098 and 0.2 part of auxiliary antioxidant 168, 0.5 parts of calcium stearate, etc. were added to the high-pressure stirring reactor. After the raw materials are added to the reactor, replace the air in the reactor with nitrogen for at least three times, then pass in nitrogen with a pressure of 0.6MPa as a protective gas, and rapidly raise the temperature to 180°C at a rate of 15°C per minute, and increase the pressure within 50 minutes. To 2.5MPa, start to keep the pressure, and the reaction time is 2.5h; wherein when a large amount of water vapor is generated in the reaction system, the pressure is kept constant by releasing the moisture in the kettle; then the pressure is reduced to normal pressure, and during the reaction, the kettle The internal temperature is not higher than...

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Abstract

The invention relates to semi-aromatic high-temperature resistant nylon and its preparation method. The preparation method provided by the invention comprises the following steps of: by weight, adding 75-95 parts of nylon salt, 0.2-0.8 part of an end-capping reagent, 0.1-0.6 part of a catalyst, 0.5-1 part of an antioxidant, 0.1-0.5 part of a lubricant and 30-50 parts of deionized water into a stirred polymerization autoclave, synthesizing a high-temperature resistant nylon prepolymer in a high-pressure stirred tank reactor, and carrying out melting extrusion on the prepolymer through a double screw extruder twice. According to the invention, devolatilization efficiency is raised, tackifying time is shortened, and simultaneously the high-viscosity polymer in the reaction vessel can be smoothly discharged. By different extrusion temperatures, high-temperature degradation of the prepolymer is prevented. Intrinsic viscosity of the high-temperature resistant nylon prepared by the method is higher than that of a polymer prepared by a present method. Therefore, the obtained nylon in the invention has better mechanical properties.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis and processing, and relates to a high-temperature-resistant semi-aromatic nylon and a preparation method thereof. Background technique [0002] With the development of industrial technology, especially the development of surface mount technology (SMT) in the electronic and electrical industry, the temperature requirements for the basic material of the instrument are also getting higher and higher; at the same time, the automotive industry requires improved engine efficiency, greatly reducing One of the important measures to solve this problem is to use lightweight materials to reduce the weight of the car, and the main lightweight structural components are located around the engine, which requires the materials used to be light, high temperature resistant, High strength, dimensional stability, chemical resistance and other properties. Semi-aromatic nylon has become one of the more ideal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L77/02C08L77/06C08G69/26C08K5/098
Inventor 李荣
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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