Preparation method of semi-aromatic polyamide

A semi-aromatic and polyamide technology, applied in the field of semi-aromatic polyamide preparation, can solve the problems that the low-temperature solution polycondensation method is not suitable for industrialized large-scale production, high requirements for reaction equipment, and inability to operate continuously, etc., achieving low cost , Low production cost, easy to recycle

Active Publication Date: 2019-06-07
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The patent US6355769 uses a low-temperature solution polycondensation method to prepare polyamide, but this method needs to use a large amount of organic solvents, the cost is high, the re

Method used

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  • Preparation method of semi-aromatic polyamide
  • Preparation method of semi-aromatic polyamide
  • Preparation method of semi-aromatic polyamide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0046] Example 1

[0047] The preparation of semi-aromatic polyamide includes the following steps:

[0048] 1mol (i.e., 166.13g) terephthalic acid, 1.01mol (i.e., 174.05g) decanediamine, 0.01mol (i.e. 1.22g) benzoic acid, 0.34g sodium hypophosphite, 1.00g N,N'-bis-( 3-(3,5-Di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine and 510g of deionized water were added to the high temperature and high pressure polymerization reactor, the air in the reactor was replaced with nitrogen 10 times, the stirring was turned on, and the speed The temperature is 100rpm, the temperature is raised to 80°C in 0.5h, and the salt-forming reaction is performed at a constant temperature. The salt-forming reaction time is 1h; after the salt-forming reaction is completed, the temperature is raised to 220°C in 2h, during which the pressure is controlled by exhausting the gas in the kettle No more than 2.8MPa, the pre-polymerization reaction is performed at a constant temperature, and the pre-polyme...

Example Embodiment

[0050] Example 2

[0051] For the preparation of semi-aromatic polyamide, the method steps are the same as in Example 1, except that the speed of the stirrer is changed to 120 rpm. The product performance test results are shown in Table 1.

Example Embodiment

[0052] Example 3

[0053] For the preparation of semi-aromatic polyamide, the method steps are the same as those in Example 1, except that the pre-polymerization temperature is changed to 210°C. The product performance test results are shown in Table 1.

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Abstract

The invention discloses a preparation method of semi-aromatic polyamide. The preparation method comprises the following steps: 1) raw materials are placed in a reaction device and undergo a salt-forming reaction, wherein the raw materials comprise a diacid, an aliphatic diamine, a catalyst, deionized water, an antioxidant and an end capping agent; 2) a product prepared in step 1) undergoes a prepolymerization reaction to obtain a semi-aromatic polyamide prepolymer; and 3) the semi-aromatic polyamide prepolymer obtained in step 2) is subjected to a solid phase polymerization reaction to obtainthe semi-aromatic polyamide. The preparation method provided by the invention has the advantages of simple reaction steps, implementation of the prepolymerization reaction and the solid phase polymerization reaction in the same reaction device, and realization of continuous production; and the solid phase polymerization is carried out to increase the molecular weight of the polymer to obtain the semi-aromatic polyamide, so the production cost is low, and the quality of the product is easily controlled by solid phase polymerization conditions.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis. More specifically, it relates to a method for preparing semi-aromatic polyamides. Background technique [0002] Semi-aromatic polyamide is prepared by polycondensation of aromatic diacid or diamine and aliphatic diamine or diacid. Due to the introduction of aromatic rings in the molecular chain, compared with common aliphatic polyamides, semi-aromatic polyamides have significantly improved mechanical properties and heat resistance, and have a high melting point of 290-320 degrees Celsius. It is a special engineering plastic between general engineering plastics and high temperature resistant polyether ether ketone. In addition, semi-aromatic polyamides also have excellent dimensional stability, abrasion resistance, corrosion resistance and aging resistance. In recent years, with the rapid development of the automotive industry, aerospace, electronics, military and other fields, the ma...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28
Inventor 邹光继王萍丽冯梧桐艾天浩任中来季君晖
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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