PA, as the largest and most important variety of engineering plastics, has a strong vitality, mainly because it can achieve high performance after modification, and secondly, the automotive, electrical, telecommunications, electronics, machinery and other industries have increasingly strong requirements for high performance of products. The rapid development of related industries has promoted the process of high performance of engineering plastics, making it play an increasingly important role.

Features

1. The market demand for high-strength and high-rigidity nylon is increasing. New reinforcement materials such as inorganic whisker reinforcement and carbon fiber reinforced PA have become important varieties, mainly used for automotive engine parts, mechanical parts and aviation equipment parts.

2. Nylon alloying will become the mainstream of the development of modified engineering plastics. Nylon alloying is an important way to achieve high performance of nylon, and it is also the main means to manufacture nylon special materials and improve nylon performance. By mixing with other polymers, the water absorption of nylon is improved, the dimensional stability of the product is provided, as well as low-temperature brittleness, heat resistance and wear resistance. Therefore, it is suitable for the use of different requirements of different types of vehicles.

3. The manufacturing technology and application of nano nylon have developed rapidly. The advantage of nano nylon is that its thermal properties, mechanical properties, flame retardancy and barrier properties are higher than those of pure nylon, and the manufacturing cost is equivalent to that of back-through nylon. Therefore, it has great competitiveness.

4. The flame retardant nylon used in electronics, electrical and electrical appliances is increasing day by day, and green flame retardant nylon is increasingly valued by the market:

5. Antistatic, conductive nylon and magnetic nylon have become the process of electronic equipment and high performance.

6. The research and application of processing aids will promote the functionalization and high performance of modified nylon.

7. The application of comprehensive technology and the refinement of products are the driving force for the development of its industry.

Processing characteristics

l. Nylon is easily affected by moisture. In the atmosphere, the equilibrium water absorption rate of PA is 3.5%, PA66 is 2.5%, PA610 is 1.5%, and PAiOiO is 0.8%.

The water content of nylon has a great influence on its mechanical properties. In the molten state, the presence of water will cause the hydrolysis of nylon, resulting in a decrease in the molecular weight, which will reduce the mechanical properties of the product, and will also cause defects such as bubbles, silver threads and streaks on the surface of the product during molding. Therefore, it must be fully dried before molding. 2. The viscosity of nylon melt is low and the fluidity is large, and the nozzle will produce a "casting" phenomenon. It wastes raw materials and pollutes the nozzle. If a screw injection molding machine is used, the melt will flow back between the screw and the barrel wall during injection, making the injection inaccurate. Therefore, when nylon is molded in a screw injection molding machine, a check ring must be installed at the end of the screw. 3. Nylon is a crystalline polymer. The melting point is obvious and high, so nylon needs to be molded at a higher temperature. Nylon in the molten state has poor thermal stability and is easy to decompose. Therefore, the process conditions must be strictly controlled.

4 Nylon has a large molding shrinkage rate. For the manufacture of high-precision products, the mold design should determine its size based on experiments, and the molding process should be strictly controlled.

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