阻燃PC GS2020M三菱----PC plastic raw materials have high waterabsorption, so it must be preheated and dried before processing.Pure PC is dried at 120 ℃ and modified PC is generally dried at 110℃ for more than 4 hours. Drying time should not exceed 10 hours.Generally, the air extrusion method can be used to judge whetherthe drying is enough. The proportion of recycled materials canreach 20%. In some cases, recycled materials can be used, andthe actual amount depends on the quality requirements of theproducts. The recycled materials can not be mixed with differentcolor masterbatches at the same time, otherwise the properties ofthe finished products will be seriously damaged.
Due to the cost and other reasons, PC plastic products often usemodified materials, especially electrical products, but also needto increase the fire resistance. In the molding of flame retardantPC and other plastic alloy products, the requirements for theplasticizing system of the injection molding machine are goodmixing and corrosion resistance. Conventional plasticizing screw isdifficult to achieve, so it must be explained in advance whenpurchasing.
Mold and gate design, common mold temperature is 80-100 ℃, addglass fiber is 100-130 ℃, small products can use needle shapedgate, gate depth should be 70% of the thickest part, other gateshave ring and rectangular. The larger the gate, the better, toreduce the defects caused by excessive shear of the plastic. Thedepth of the vent hole should be less than 0.03-0.06mm, the runnershould be as short and round as possible, and the stripping angleis generally about 30 ′ - 1.
The melt temperature can be determined by air injection. Theprocessing temperature of general PC plastics is 270-320 ℃, andthat of some modified or low molecular weight PC plastics is230-270 ℃.
Injection speed is often used in the injection molding, such asswitch parts. The common is slow rapid prototyping.
When the back pressure is about 10 bar, it can be properlyreduced without air marks and color mixing.
If the residence time is too long at high temperature, thematerial will degrade, release CO2 and turn yellow. Do not useLDPE, POM, ABS or PA to clean the barrel, use PS to clean.
PC是一种非晶体工程材料，具有特别好的抗冲击强度、热稳定性、光泽度、抑制细菌特性、阻燃特性以及抗污染性。
PC有很好的机械特性，但流动特性较差，这种材料的注塑过程较困难。如果塑件要求有较高的抗冲击性，那么就使用低流动率的PC材料；可以使用高流动率的PC材料，这样可以优化注塑过程。
PC塑胶原料它是一种新型的热塑性塑料，透明的度达90%，被誉为是透明金属。它刚硬而具有韧性，具有较高的冲击强度，高度的尺寸稳定性和范围很宽的使用温度、良好的电绝缘性能及耐热性和无毒性，可以通过注射、挤出成型。
