What is the service life and performance degradation of PA66+GF in extreme environments?
Publish Time: 2025-03-27
Nylon 66, as a high-performance thermoplastic engineering plastic, has been widely used in many fields due to its high mechanical strength, chemical resistance, oil resistance, wear resistance, self-lubrication and easy processing and molding. However, in some application scenarios that require high strength, high rigidity and high dimensional stability, such as electric drill housing, motor housing, pump impeller, sleeve, etc., pure nylon 66 may not meet the requirements. Therefore, reinforcing and modifying by adding glass fiber (GF) has become an important way to improve the performance of nylon 66.PA66+GF composites combine the excellent properties of nylon 66 with the high strength and high modulus characteristics of glass fiber, significantly improving the rigidity, strength and hardness of the material, and improving dimensional stability and heat resistance. However, the service life and performance degradation of this composite material in extreme environments still need to be further explored.In extreme environments, such as high temperature, high humidity, strong ultraviolet radiation or corrosive media, the performance of PA66+GF composites may be affected to varying degrees. High temperature environment will lead to the intensification of molecular chain movement inside the material, thereby accelerating the aging process and gradually reducing the tensile strength, bending strength and impact strength of the material. At the same time, high temperature may also trigger thermal oxidation reaction of the material, resulting in color change, embrittlement and even cracking of the material surface.High humidity environment may trigger hydrolysis reaction of PA66+GF composite material, resulting in degradation of material performance. Hydrolysis reaction will break the nylon 66 molecular chain, reducing the mechanical properties and heat resistance of the material. In addition, strong ultraviolet radiation is also one of the important factors leading to material aging. Ultraviolet radiation will destroy the chemical bonds in the nylon 66 molecular chain, resulting in a gradual decline in material performance.In corrosive media, PA66+GF composite materials may be affected by chemical corrosion, resulting in corrosion spots and thinning on the surface of the material, thereby reducing the mechanical properties and durability of the material.Although PA66+GF composite materials face many challenges in extreme environments, reasonable formula design and production process optimization can significantly extend their service life and slow down performance degradation. For example, adding an appropriate amount of antioxidants, anti-hydrolysis agents and UV absorbers to the material formula can improve the weather resistance and anti-aging properties of the material. At the same time, optimizing production process parameters, such as injection temperature, mold temperature, injection pressure and holding time, can also help improve the performance stability and service life of the material.In summary, the service life and performance attenuation of PA66+GF composite materials in extreme environments depend on the combined effect of multiple factors. Through reasonable formula design, production process optimization and appropriate maintenance measures, the service life of the material can be significantly extended and its performance stability in extreme environments can be improved.
