PA, as an important variety of engineering plastics, possesses strong vitality, primarily due to its high-performance realization after modification. Secondly, the ever-increasing demand for high-performance products in industries such as automotive, electrical, telecommunications, electronics, and machinery, coupled with the rapid development of these industries, has accelerated the process of high-performance engineering plastics, making them play an increasingly significant role.
Features:
The demand for high-strength, high-rigidity nylon is on the rise, with new reinforcing materials such as inorganic whisker reinforcement and carbon fiber-reinforced PA becoming key varieties. These are primarily used in automotive engine components, mechanical parts, and aviation equipment components.
2. Nylon alloying will become the mainstream in the development of modified engineering plastics. Nylon alloying is a crucial method to achieve high-performance nylon and the primary means to produce specialized nylon materials and enhance its properties. By blending with other high polymers, it improves nylon's water absorption, provides dimensional stability to products, and enhances its low-temperature brittleness, heat resistance, and wear resistance. Consequently, it is suitable for various applications with different vehicle requirements.
3. The manufacturing technology and applications of Nanonylon are rapidly advancing. Nanonylon boasts superior thermal and mechanical properties, flame retardancy, and barrier properties compared to pure nylon, with a manufacturing cost comparable to that of conventional nylon. As a result, it holds significant competitive advantages.
4. Flame-retardant nylon for electronics, electrical, and electrical appliances is increasingly in demand, with green flame-retardant nylon gaining more market attention.
5. Antistatic, conductive nylon, and magnetic nylon are becoming integral to the advancement of electronic devices and high-performance applications.
Research and application of processing additives will promote the functionalization and high-performance development of modified nylon.
The application of comprehensive technology and the refinement of products are the driving force behind the industry's development.
Processing Characteristics
1. Nylon is prone to moisture absorption. In the atmosphere, the equilibrium moisture absorption rate of PA is 3.5%, PA66 is 2.5%, PA610 is 1.5%, and PAiOiO is 0.8%. The moisture content has a significant impact on the mechanical properties of nylon. In the molten state, the presence of water can lead to hydrolysis of nylon, resulting in a decrease in molecular weight and a drop in the mechanical properties of the product. It can also cause defects such as bubbles, silver threads, and streaks on the surface during molding. Therefore, thorough drying is essential before molding.
2. Nylon melt has low viscosity and high fluidity, causing the nozzle to experience "extrusion" phenomena. This leads to material waste and nozzle contamination. When using a screw injection molding machine, there is a reverse flow between the screw and the barrel wall during injection, resulting in inaccurate material feeding. Therefore, when molding nylon in a screw injection molding machine, a non-return valve must be installed at the end of the screw.
3. Nylon is a crystalline polymer with a distinct and high melting point. Therefore, it must be molded at higher temperatures. The nylon in a molten state has poor thermal stability and is prone to decomposition. As a result, strict control over the process conditions is essential.
4. Nylon has a high molding shrinkage rate. For the production of high-precision products, mold design should be determined based on experiments and the molding process should be strictly controlled.
