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 of side reactions, inability to ensure the molar ratio balance of monomeric dicarboxylic acid and diamine, increase the reaction pressure, etc., and achieve The effect of high crystallinity, good processing stability and low active end group content
CN101759852AInactive Publication Date: 2010-06-30KINGFA SCI & TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KINGFA SCI & TECH CO LTD
Publication Date
2010-06-30
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a preparation method of semi-aromatic polyamide. In the method, aromatic dicarboxylic acid and a recovery aliphatic diamine concentrated solution containing 4-14 carbon atoms are used for preparing the semi-aromatic polyamide, thereby reducing the waste of raw material diamine in production, reducing the production cost and simultaneously lightening the influence of environmental pollution. The semi-aromatic polyamide has higher crystallinity, inherent viscosity and heat-resistance temperature, good hue, low active terminal group content, good processing stability and no corrosion to moulds. Through a prepolymerization reaction, a prepolymer with the inherent viscosity [eta] within the range of 0.06-0.3dl / g measured in 96 percent sulfuric acid at 25 DEG C can be obtained. After a tackification reaction, the inherent viscosity [eta] of the semi-aromatic polyamide is 0.8-2.5dl / g, the melting point of the semi-aromatic polyamide is 270-330 DEG C, the content of terminal carboxyl groups is 15-80mol / t, and the content of terminal amino groups is 15-80mol / t.
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Description

technical field

[0001] The present invention relates to the preparation technology of semi-aromatic polyamide. Background technique

[0002] Aliphatic polyamides, such as PA6 and PA66, have excellent mechanical strength, heat resistance, chemical resistance, wear resistance and self-lubricating properties, and low coefficient of friction. Their applications include electronic appliances, automotive parts, furniture , building materials and fibers, has become one of the most important engineering plastics.

[0003] Semi-aromatic polyamide is a polyamide resin prepared by polycondensation of diamines or dicarboxylic acids with aromatic rings and aliphatic dicarboxylic acids or diamines, and is one of the aromatic polyamides. Due to the introduction of aromatic rings into the main chain of polyamide molecules, the heat resistance and mechanical properties are improved, the water absorption rate is reduced, and it has a more suitable performance / price ratio. It is between gener...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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