High temperature resistant PA66 basic innovative plastic; United States&# 41; RCL-4036

Description :

　　High temperature resistant PA66 basic innovative plastic (USA) RCL-4036

　　Our company supplies raw materials such as PC, ABS, PEI, PBT, PA6, PA66, PPO, etc. for SABIC at favorable prices. You can directly contact Ms. He.

　　1、 Drying of Nylon PA66

　　Vacuum drying: temperature ℃ 95-105 time 6-8 hours

　　Hot air drying: temperature of 90-100 ℃ for about 4 hours.

　　Crystallinity: Except for transparent nylon, nylon is mostly a crystalline polymer with high crystallinity. The tensile strength, wear resistance, hardness, lubricity and other properties of the product have been improved, but the thermal expansion coefficient and water absorption tend to decrease. However, it is not conducive to transparency and impact resistance. Mold temperature has a significant impact on crystallization, with higher mold temperature resulting in higher crystallinity and lower mold temperature resulting in lower crystallinity

　　Shrinkage rate: Similar to other crystalline plastics, nylon resin has a problem of high shrinkage rate. Generally, the shrinkage of nylon is closely related to crystallization. When the crystallinity of the product is high, the shrinkage of the product will also increase. Lowering the mold temperature, increasing the injection pressure, and lowering the material temperature during the molding process will all reduce shrinkage, but increasing the internal stress of the product can easily cause deformation PA66 shrinkage rate 1.5-2%

　　Molding equipment: When molding nylon, the main concern is to prevent the "nozzle casting phenomenon", so self-locking nozzles are generally used for processing nylon materials.

　　2、 Products and molds

　　1. The wall thickness of the product, the flow length ratio of nylon, is between 150-200. The wall thickness of nylon products should not be less than 0.8mm, and is generally selected between 1-3.2mm. Moreover, the shrinkage of the product is related to its wall thickness, and the thicker the wall thickness, the greater the shrinkage.

　　2. The overflow value of exhaust nylon resin is about 0.03mm, so the exhaust hole groove should be controlled below 0.025.

　　3. Mold temperature: For molds with thin walls that are difficult to form or require high crystallinity, cold water temperature control is generally used for molds that require a certain degree of flexibility.

　　3、 The molding process of nylon

　　barrel temperature

　　As nylon is a crystalline polymer, its melting point is obvious. The temperature of the barrel selected for injection molding of nylon resins is related to the properties of the resin itself, equipment, and the shape of the product. Nylon 66 has a temperature of 260 ℃. Due to the poor thermal stability of nylon, it is not suitable to stay in the barrel at high temperatures for a long time to avoid discoloration and yellowing of the material. At the same time, due to the good fluidity of nylon, it flows rapidly when the temperature exceeds its melting point.

　　Injection pressure

　　Nylon solution has low viscosity and good fluidity, but its condensation speed is fast. It is prone to deficiency problems in products with complex shapes and thin wall thicknesses, so higher injection pressure is still required.

　　Usually, if the pressure is too high, the product may experience edge overflow issues; If the pressure is too low, the product may produce defects such as ripples, bubbles, obvious fusion marks, or insufficient products. The injection pressure of most nylon varieties does not exceed 120MPA, and is generally selected within the range of 60-100MPA to meet the requirements of most products. As long as the product does not have defects such as bubbles and dents, it is generally not desirable to use a higher holding pressure to avoid increasing internal stress in the product. For nylon, a faster injection speed is beneficial to prevent ripples and insufficient mold filling caused by excessive cooling. The fast injection speed does not have a significant impact on the performance of the product.

　　mold temperature

　　Mold temperature has a certain impact on crystallinity and molding shrinkage rate. High mold temperature increases crystallinity, wear resistance, hardness, elastic modulus, water absorption decreases, and the molding shrinkage rate of the product increases; Low crystallinity, good toughness, and high elongation at low mold temperatures.

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