SEMI-AROMATIC POLYAMIDE, PREPARATION METHOD THEREOF, AND POLYAMIDE MOLDING COMPOSITION CONTAINING SAID SEMI-AROMATIC POLYAMIDE

摘要

The present invention relates to a semi-aromatic polyamide resin, a preparation method thereof, and a polyamide molding composition containing said semi-aromatic polyamide resin. The content of isolated terephthalic acid in the semi-aromatic polyamide resin is less than 500 ppm. Said semi-aromatic polyamide resin consists of the following repeating units: (a) a terephthalic acid or a derivative thereof, and optionally one or more additional aromatic or aliphatic diacids; (b) one or more aliphatic diamines having 10-20 carbon atoms, and optionally one or more additional diamines; (c) optionally one or more amino carboxylic acids and/or lactam, wherein the terephthalic acid accounts for 50-100 mol % of (a), and one or more aliphatic diamines have 10-20 carbon atoms accounting for 50-100 mol % in the aliphatic diamines (b), and the one or more amino carboxylic acids and/or lactam account for 0-25 mol % of the total amount of (a) + (b) + (c). The disclosed semi-aromatic polyamide resin may improve the melting process by solving problems related to, for example but not limited to, gas and products pollution.