PA46 manufacturing method
PA46 is a high-performance engineering plastics, with excellent heat resistance, chemical resistance, mechanical properties and electrical properties, widely used in automotive, electrical and electronic, aerospace, petrochemical and other fields. In the field of raw materials for chemical production, the manufacturing method of PA46 mainly adopts polymerization reaction, and high quality PA46 products can be obtained by controlling the reaction conditions and raw material ratios. This article will introduce the manufacturing method of PA46 in detail.
I. Raw material preparation
PA46 manufacturing needs to prepare the following raw materials: adipic acid, adipic acid, catalyst, antioxidant and so on. Among them, adipic acid and adipic diamine are the main raw materials of PA46, and the role of catalyst and antioxidant is to promote the polymerization reaction and prevent material aging.
II, polymerization reaction
PA46 manufacturing using polymerization reaction, mainly divided into two stages: pre-polymerization and final polymerization.
1. pre-polymerization
in the pre-polymerization stage, the adipic acid and adipic diamine according to a certain molar ratio added to the reactor, add catalyst, control the reaction temperature in the appropriate range, pre-polymerization reaction. The purpose of the pre-polymerization reaction is to generate a low molecular weight prepolymer in preparation for the final polymerization reaction.
2. Final polymerization
At the stage of final polymerization, the prepolymer is transferred to the final polymerization reactor, add additives such as antioxidants, continue to raise the reaction temperature, and carry out the final polymerization reaction. The purpose of the final polymerization reaction is to produce high molecular weight PA46 resin.
In the process of polymerization reaction, it is necessary to control the reaction temperature, pressure, stirring speed and other parameters to ensure the smooth progress of the reaction and the quality of the product.
Third, post-processing
After the polymerization reaction is completed, post-processing is required, including cooling, pelletizing, drying and other processes to obtain the final PA46 product.
Fourth, quality control
In the manufacturing process of PA46, it is necessary to strictly control the quality of raw materials, reaction conditions and product performance indicators to ensure stable and reliable product quality. At the same time, it is also necessary to carry out batch testing of products and retained samples for observation, so as to detect problems in time and take appropriate measures.
In short, the manufacturing method of PA46 needs to master the principle of polymerization reaction and process control points, focusing on the detailed operation of raw material preparation, polymerization reaction, post-processing and quality control to ensure the quality and yield of products.
