Shanghai Daoqin Plastics Co., Ltd.

PBT polybutylene terephthalate (PBT) chemical and material features PBT is most tough engineering thermoplastic material 之一, it is semi crystallization material, has non good chemical stability property, machine strong/high degree, electrical insulation features and heat stabilized property. this material in very ring conditions lower has very good stability property. PBT吸 wet features very low. non reinforcement type PBT force strong/high degree is 50MPa, additives type PBT张 force strong/high degree is 170MPa. additives more will 导致材 material 变脆. PBT; crystallization very speed, this will 导致因 cooling non-uniform formed bending deformation. for/regarding has additives type type material, process/workflow direction shrinkage rate can decrease small, and process/workflow direction shrinkage rate basic upper and 普通材 material has difference. generally material shrinkage rate in 1.5%~2.8% between. 含30%玻璃 additives material shrinkage 0.3%~1.6% between. melting point （225%C） and high temperature deformation temperature degree ratio PET材 material need low. Vicat softening temperature large is 170C. 玻璃化转换 temperature degree （glass trasitio temperature） in 22C to 43C between. due to PBT crystallization speed degree very high, therefore it viscous property very low, parts processing cycle time generally relatively low. injection molding parts process conditions drying 处理: this type of material in high temperature lower very easy hydrolysis, therefore processing front drying is very important. in gas in drying conditions is 120C,6~8 small 时, or 者150C, 2~4 small 时. wet degree must small 于0.03%. if use wet drying device drying, conditions is 150C, 2.5 small 时 熔化 temperature degree: 225~275C, temperature degree: 250C. injection molding parts mold temperature degree: for/regarding reinforcement type material is 40~60C. need very good design injection molding parts mold cooling 腔道以 decrease small parts bending. hot amount dispersion 失一定 need fast uniform. injection molding parts mold cooling 腔道 直径 is 12mm. injection pressure: in and other （ most large to 1500bar）. injection speed degree: use can can fast injection speed degree （因 is PBT solid very fast ）. runner and gate:建议 use runner increase pressure 传递（ experience 公式: runner 直径=塑 parts thick degree +1.5mm）. can use various type gate. can use hot runner, need attention/notes anti material and degradation. gate 直径应该 in 0.8~1.0*t between, this t is parts thick degree. if is 潜入式 gate, most small is 0.75mm. type applications use device tool （ food processing sheet/slice, true 空吸尘 device parts, electrical 风扇, drying machine housing/shell 体, device and other ）, electrical appliances parts （开关, electrical machine housing/shell, filament box/case, machine 键盘按键 and other ）, automotive industrial （ dispersion hot device 格窗, 车身嵌 sheet/plate, cover/cap, 门窗部 parts and other ）.