High-fluidity polyhexamethylene adipamide modified base resin and preparation method thereof

Abstract

The invention discloses high-fluidity polyhexamethylene adipamide modified base resin and a preparation method thereof. The preparation method comprises the following steps: (1) mixing hexanediamine,adipic acid and desalted water for a reaction, and then adding hexanediamine to adjust the pH to obtain a polyamide salt solution; (2) performing evaporation and concentration; (3) performing heatingto obtain a prepolymer; (4) keeping the system pressure constant, and continuing heating to obtain low molecular polyamide; (5) performing depressurization to obtain a product, that is, a polyhexamethylene adipamide molten product; and (6) performing cooling, and performing pelletizing and granulation to obtain the polyhexamethylene adipamide product. The method disclosed by the invention preparesthe high-fluidity polyhexamethylene adipamide modified base resin on the premise of guaranteeing the excellent mechanical properties of the polyhexamethylene adipamide product through the additive and the process and controlling on the molecular weight of the product; and the polyhexamethylene adipamide prepared by the method is an engineering plastic grade product instead of a spinning grade product.

Description

technical field [0001] The invention relates to a polyhexamethylene adipamide modified base material resin and a preparation method thereof. Background technique [0002] As one of the commonly used engineering plastics, polyhexamethylene adipamide has good mechanical properties, corrosion resistance, heat resistance and durability, and can replace part of the application of metal materials. With the development of the market, the demand for polyhexamethylene adipamide to replace metals in the fields of aerospace, automobiles, power tools, and office equipment has grown rapidly, and higher requirements have been put forward for the performance of polyhexamethylene adipamide . Especially in the automotive industry, not only the excellent mechanical strength of polyhexamethylene adipamide is required, but also the high fluidity of polyhexamethylene adipamide is required, so that more glass fiber, carbon fiber, etc. can be added Reinforcement material. [0003] At present, t...

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Problems solved by technology

[0003] At present, the general-purpose polyhexamethylene adipamide is usually 70-80g / 10min due to fluidity restrictions, which leads to the addition of additives, especially glass fiber and carbon fiber, which are limited and unevenly dispersed. with larger performance constraints

[0004] In the field of polyhexamethylene adipamide preparation, the general method for improving polyhexamethylene adipamide is to add a large amount of oil agents such as internal lubricant or white oil through the screw, and improve fluidity by increasing the intermolecular lubricity, but this After the molecular structure of the product is destroyed by this method, the strength of the product will drop significantly compared with that before modification, and the lubricant and oil introduced by this method will greatly reduce the flame retardancy of the product because they are flammable substances.

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