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A kind of preparation method of semi-aromatic polyamide

A technology for semi-aromatic and polyamide, which is applied in the field of preparation of semi-aromatic polyamide, can solve the problems that the low-temperature solution polycondensation method is not suitable for industrialized large-scale production, cannot be operated continuously, and requires high reaction equipment, and achieves low cost, The effect of low production cost and easy recycling

Active Publication Date: 2022-05-20
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • 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 requirements for reaction equipment are high, and continuous operation is not possible, so the low-temperature solution polycondensation method is not suitable for large-scale industrial production

Method used

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  • A kind of preparation method of semi-aromatic polyamide
  • A kind of preparation method of semi-aromatic polyamide
  • A kind of preparation method of semi-aromatic polyamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of semiaromatic polyamide comprises the steps:

[0048] 1mol (ie 166.13g) terephthalic acid, 1.01mol (ie 174.05g) decanediamine, 0.01mol (ie 1.22g) benzoic acid, 0.34g sodium hypophosphite, 1.00g N,N'-bis-( Add 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine and 510g deionized water into the high-temperature and high-pressure polymerization reactor, replace the air in the reactor with nitrogen for 10 times, start stirring, and The temperature is 100rpm, the temperature is raised to 80°C within 0.5h, and the salt-forming reaction is carried out at a constant temperature. The time of the salt-forming reaction is 1h; after the completion of the salt-forming reaction, the temperature is raised to 220°C within 2h, during which the pressure is controlled by discharging the gas in the kettle No more than 2.8MPa, pre-polymerization at constant temperature, the time of the pre-polymerization is 0.5h, after the completion of the pre-polymerizat...

Embodiment 2

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

Embodiment 3

[0053] The preparation of the semi-aromatic polyamide is the same as in Example 1, except that the prepolymerization 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 a semi-aromatic polyamide, which comprises the following steps: 1) placing raw materials in reaction equipment for a salt-forming reaction; the raw materials include dibasic acids, aliphatic diamines, catalysts, Ionized water, antioxidant and end-capping agent; 2) prepolymerize the product obtained in step 1) to obtain a semi-aromatic polyamide prepolymer; 3) prepare the semi-aromatic polyamide obtained in step 2) The prepolymer undergoes solid state polymerization to obtain semi-aromatic polyamide. The preparation method provided by the invention has simple reaction steps, pre-polymerization and solid-phase polymerization can be carried out in the same reaction equipment, and continuous production is possible; the invention uses solid-phase polymerization to increase the molecular weight of the polymer to obtain semi-aromatic polyamide, and the production The cost is low, and the quality of the product is easier to control through 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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Patent Type & Authority Patents(China)
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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