Semi-aromatic nylon composition and preparation method thereof

Abstract

The invention discloses a semi-aromatic nylon composition which comprises the following components in parts by weight: 35-75 parts of semi-aromatic nylon resin, 25-50 parts of reinforced fibers, 0.3-1part of an inorganic nucleating agent, 0.5-1 part of 2,6-naphthalic acid and derivatives thereof, 0-24 parts of a flame retardant and 0-7 parts of a synergistic flame retardant. The semi-aromatic nylon composition disclosed by the invention is high in crystallization temperature and short in molding period; the invention solves the problems that the existing modified semi-aromatic nylon compositematerial is difficult to mold and demold, the size shrinkage of a molded product needs post-treatment and the like. The product has excellent high-temperature creep resistance and comprehensive mechanical properties and can be widely applied to the fields of electronics, automobiles, war industry and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a semi-aromatic nylon composition with excellent comprehensive mechanical properties and molding processing properties and a preparation method thereof. Background technique [0002] In recent years, semi-aromatic nylon has been focused on development due to its excellent heat resistance and mechanical properties. At present, the semi-aromatic nylons that have been industrialized mainly include PA6T, PA9T and PA10T. Among them, because the melting point (370°C) of PA6T is higher than its decomposition temperature (350°C), it cannot be processed by injection molding or extrusion, which hinders its industrialization speed. In order to achieve a wide range of use of PA6T, a certain amount of other nylon monomers are usually added to the PA6T homopolymer to copolymerize and modify to lower its melting point to obtain copolymers such as PA6T-66, PA6T-6, and PA6T-6I. Howeve...

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Problems solved by technology

Oligomers are mainly Brüggemann’s P22 at present. This kind of nucleating agent has a significant nucleating effect, but because of its strong hydrogen bond force, it is difficult to be well dispersed in the nylon matrix, and it is difficult for nylon to resist Great loss in impact performance and other aspects

[0005] In addition, the crystallization temperature of the semi-aromatic nylon composition is low, which will lead to incomplete crystallization of the molded product, which will cause: ① difficult demoulding of the molded product; ② obvious shrinkage marks on the surface of the molded product, which will affect the appearance of the product and subsequent assembly ; ③ The high temperature creep resistance of molded products is not enough. In order to ensure its high temperature creep resistance, post-processing procedures are required, which increases the production cost

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