Halogen-free, flame-retardant and highly-processable PA6T polyamide resin and preparation method thereof

Abstract

The invention relates to the field of halogen-free environment-friendly polyamide resin, in particular to halogen-free, flame-retardant and highly-processable PA6T polyamide resin and a preparation method thereof. The PA6T polyamide resin is a polymer formed by taking 1,1,3,5-tetraphenol-3-ethylenediamine cyclotriphosphazene as a monomer and directly bonding the monomer into a molecular main chainof the PA6T polyamide resin. The preparation method comprises the following steps: directly adding hexanediamine, terephthalic acid and the 1,1,3,5-tetraphenol-3-ethylenediamine cyclotriphosphazene,which are taken as reactive monomers, into a high pressure reaction kettle, and embedding the 1,1,3,5-tetraphenol-3-ethylenediamine cyclotriphosphazene, used as the monomer, into the macromolecular chain of the PA6T polyamide resin by using three steps of methods, i.e., salifying, prepolymerization and solid phase polymerization so as to form the polymer. The PA6T polyamide resin modified by the method does not contain halogens and has high processability and good flame retardance.

Description

technical field [0001] The invention relates to the field of halogen-free environment-friendly polyamide resins, in particular to a halogen-free flame-retardant, highly processable PA6T polyamide resin and a preparation method thereof. Background technique [0002] Polyhexamethylene terephthalamide (PA6T) is one of the representative materials among semi-aromatic polyamides. It has the characteristics of low hygroscopicity, high dimensional stability, high strength and rigidity, and excellent chemical resistance. The melting point of PA6T is very high (370°C), and the decomposition temperature is around 350°C. Since the decomposition temperature is lower than the melting point, the processing and application of PA6T is very difficult. PA6T has superior performance and a wide range of applications. In order to better play its excellent role, it is necessary to do flame retardant treatment on it. At the same time, with the continuous development of society, the terminal appli...

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Problems solved by technology

[0004] In order to solve the problem that there is a gap between the flame retardant performance of PA6T and the actual demand in the prior art, the present invention uses polyphosphazene derivatives as reactive flame retardants directly bonded to the molecular main chain of PA6T to obtain a flame retardant with superior flame retardant performance. PA6T polyamide resin

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