Nylon and preparation method thereof

Abstract

The invention belongs to the technical field of polymer processing, and relates to nylon and a preparation method thereof. The nylon is prepared from the following components: 1 part of dicarboxylic acid, diamine, a catalyst, a blocking agent, exchange reaction inhibitor, a nucleating agent and antioxidant, wherein the diamine and the dicarboxylic acid are equal in molar weight; the catalyst accounts for 0.001-0.1wt% of the total weight of the dicarboxylic acid and diamine; the blocking agent accounts for 0.05-1mol% of the total molar weight of the dicarboxylic acid and diamine; the exchange reaction inhibitor accounts for 0.1-5wt% of the total weight of the dicarboxylic acid and diamine; the nucleating agent accounts for 0.1-1wt% of the total weight of the dicarboxylic acid and diamine; and the antioxidant accounts for 0.001-1wt% of the total weight of the dicarboxylic acid and diamine. According to the invention, a primary polymerization product is low in viscosity, and the pressure in a kettle is high, so that pressure spray can be easily realized to prepare dry nylon polymer powder; and further polycondensation can be performed on the low-polymerization-degree nylon through melt polycondensation. Thus, the materials do not need to be further subjected to a long-time solid-phase tackifying process, thereby shortening the reaction time and improving the performance of the high-temperature nylon.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, and relates to nylon and a preparation method thereof. Background technique [0002] There are many patents on the preparation of nylon, such as US Patent US4722997, US Patent US4131712, US Patent US4433146, US Patent US4438257, Japan Patent JP02251352, Japan Patent JP034317, Japan Patent JP03161507, Japan Patent JP859825, Japan Patent JP8198963, CN101200543A etc., in order to produce high-temperature-resistant nylon, widely used is the batch method that will be in the dicarboxylic acid under the molten state and diamine point direct polymerization in pressurized reactor. However, the polyamide produced must be kept at a high temperature not lower than the melting point for a long time in the latter reaction stage in order to obtain a high molecular weight. However, since the melting point is close to its decomposition temperature, as a result, thermal degradation of polyamide often o...

AI Technical Summary

Problems solved by technology

Moreover, it is very difficult to transfer the high-viscosity nylon out of the stirring polymerization kettle, and it is easy to cause the material to stick in the kettle and cause dead material, which requires a lot of manpower and material resources to clean up.

Therefore, there is a lack of a high-temperature nylon with improved mechanical properties and high-temperature resistance in the art and a preparation method thereof