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Preparation method for semi-aromatic nylon

A semi-aromatic and nylon technology, used in the field of semi-aromatic nylon and its preparation, can solve the problems of low initial viscosity of prepolymer, easy oxidation of polymer, high equipment requirements, etc., and achieve the effect of shortening time, difficult curing and high yield

Active Publication Date: 2015-11-18
株洲时代工程塑料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these patents, some of the pre-polymerization processes use a synthesis method with high polymerization temperature or high polymerization pressure. The polymer is easily oxidized and requires high equipment requirements; Solidification, the discharge is not smooth, and the initial viscosity of the prepolymer is low, which is not conducive to subsequent thickening; the existing thickening process uses solid phase thickening, which takes a long time for thickening and low production efficiency

Method used

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  • Preparation method for semi-aromatic nylon
  • Preparation method for semi-aromatic nylon

Examples

Experimental program
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Effect test

Embodiment 1

[0070] A kind of preparation method of semi-aromatic nylon of the present invention, comprises the following steps:

[0071] 1. Preparation of prepolymer:

[0072] Weigh nylon salt mixture, end-capping agent, catalyst, antioxidant and deionized water according to the following parts by mass: 50 parts of nylon 6T salt, 40 parts of nylon 66 salt, 10 parts of nylon 1010 salt, 0.5 part of end-capping agent benzoic acid , 0.2 parts of catalyst sodium hypophosphite, 0.5 parts of antioxidant 1098, 25 parts of deionized water;

[0073] Add the above-mentioned raw materials in parts by mass into the polymerization reactor, close the polymerization reactor, replace the air in the polymerization reactor with nitrogen three times, and then fill in nitrogen until the pressure in the polymerization reactor is 0.15 MPa higher than the atmospheric pressure; When the temperature reaches 220°C, make the pressure inside the kettle reach 2.2MPa, keep the temperature and pressure stable, and full...

Embodiment 2

[0078] A kind of preparation method of semi-aromatic nylon of the present invention, comprises the following steps:

[0079] 1. Preparation of prepolymer:

[0080] Weigh the nylon salt mixture, end-capping agent, catalyst, antioxidant and deionized water in the following parts by mass: 60 parts of nylon 6T salt, 10 parts of nylon 6I salt, 30 parts of nylon 1010 salt, 0.6 part of end-capping agent benzoic acid , 0.2 parts of catalyst sodium hypophosphite, 0.5 parts of antioxidant 1098, 30 parts of deionized water;

[0081] Add the above-mentioned raw materials in parts by mass into the polymerization reactor, close the polymerization reactor, replace the air in the polymerization reactor with nitrogen three times, and then fill in nitrogen until the pressure in the polymerization reactor is 0.15 MPa higher than the atmospheric pressure; When the temperature reaches 220°C, make the pressure inside the kettle reach 2.3MPa, keep the temperature and pressure stable, and fully reac...

Embodiment 3

[0086] A kind of preparation method of semi-aromatic nylon of the present invention, comprises the following steps:

[0087] 1. Preparation of prepolymer:

[0088] Weigh the nylon salt mixture, end-capping agent, catalyst, antioxidant and deionized water in the following parts by mass: 50 parts of nylon 6T salt, 40 parts of nylon 66 salt, 10 parts of nylon 1212 salt, 0.5 part of end-capping agent benzoic acid , 0.2 parts of catalyst sodium hypophosphite, 0.5 parts of antioxidant 1076, 30 parts of deionized water;

[0089] Add the above-mentioned raw materials in parts by mass into the polymerization reactor, close the polymerization reactor, replace the air in the polymerization reactor with nitrogen three times, and then fill in nitrogen until the pressure in the polymerization reactor is 0.15 MPa higher than the atmospheric pressure; When the temperature reaches 220°C, make the pressure inside the kettle reach 2.4MPa, keep the temperature and pressure stable, and fully reac...

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Abstract

A preparation method for semi-aromatic nylon comprises the following steps: weighing a nylon salt mixture, an end-capping reagent, a catalyst, an antioxidant and deionized water in parts by mass, adding the raw materials into a polymerization reaction kettle, and closing the reaction kettle, wherein an inert atmosphere is kept in the kettle; raising the temperature in the kettle to over 160 DEG C by heating and raising the pressure to over 1.2MPa, wherein the raw materials added into the polymerization reaction kettle fully react; then continuously raising the temperature in the kettle to over 250 DEG C, releasing vapor in the polymerization reaction kettle to gradually reduce the pressure in the kettle to be less than 0.8MPa, and finally discharging a prepolymer obtained by reaction out of the kettle; firstly crushing the obtained prepolymer; and then fusing the prepolymer through an extruder and conveying the prepolymer to a liquid phase viscosity-increasing kettle to quickly and effectively improve the viscosity of the prepolymer so as to obtain a semi-aromatic nylon product. According to the method provided by the invention, discharge is smooth and the yield is high, and the prepolymer with moderate viscosity is obtained, so that the viscosity is quickly and effectively increased in the later stage preferably.

Description

technical field [0001] The invention relates to the field of nylon preparation, in particular to a semi-aromatic nylon and a preparation method thereof. Background technique [0002] Semi-aromatic nylon is a polyamide material obtained by copolymerization of dibasic acid or diamine with aromatic ring and aliphatic diamine or diacid. The advantages of high strength, heat resistance, solvent resistance, and low moisture absorption. Various molding processing methods and excellent performance make it suitable for some fields where aliphatic nylon and fully aromatic nylon cannot meet the requirements, such as the lightweight of automotive engine parts and the surface mounting technology of electronic devices. At present, the main semi-aromatic nylon products are: nylon 6T copolymer, nylon 9T, nylon 10T, etc. Among them, nylon 6T copolymer is obtained by copolymerizing nylon 6T salt and other aliphatic nylon salts. A series of products with different properties can be obtaine...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28C08G69/36
Inventor 曹凯凯杨克俭陈林飞彭军陈智军王文志姜其斌
Owner 株洲时代工程塑料科技有限责任公司
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