PC raw material 503R-131, American basic innovative plastic spot

Description :

　　PC raw material 503R-131, American basic innovative plastic spot

　　PC plastics, even when exposed to very low levels of moisture, can undergo hydrolysis to break bonds, reduce molecular weight, and decrease physical strength. Therefore, before the molding process, the moisture content of polycarbonate should be strictly controlled below 0.02% to avoid a decrease in mechanical strength or abnormal appearance such as bubbles and silver lines on the surface of the molded product.

　　PC is extremely sensitive to water, so it must be thoroughly dried before injection molding to reduce its moisture content to below 0.02%. The general drying conditions for PC are 100-120 ℃ for at least 4 hours;

　　Injection temperature

　　The injection temperature must take into account the shape, size, and mold structure of the product. The product performance, requirements, and other aspects must be considered before making a decision.

　　Generally, the temperature between 270~320 ℃ is selected for molding. If the material temperature exceeds 340 ℃, PC will decompose, the color of the product will darken, and defects such as silver wires, dark stripes, black spots, and bubbles will appear on the surface. At the same time, the physical and mechanical properties will also significantly decrease.

　　PC is also sensitive to temperature, and the viscosity of the melt decreases significantly with increasing temperature. The temperature of the barrel should be between 250~320 ℃ (not exceeding 350 ℃). Increasing the barrel temperature appropriately is beneficial for PC plasticization. If necessary, perform internal stress annealing at an oven temperature of 125~135 ℃ for 2 hours, and cool naturally to room temperature.

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