PC+PBT 357XU

东莞永大塑胶原料有限公司
主营产品：

塑胶原料 工程塑胶 聚酰胺 PA66耐磨损 PA66超韧耐寒级 PA66食品级 PA66加玻纤 PA66增韧级 PA66阻燃防火 POM聚甲醛 高粘度POM 坚韧级POM 耐磨损POM 高韧性POM 抗紫外线POM 加玻纤POM 低翘曲POM
工程塑胶：EVA、PC、POM、PA6、PA66、PEEK、COC、PBT、PET PC/ABS、PPS、PPO、LCP；PC
热弹性体：K胶、TPE、TPR、PVC、TPU、TPV、TPX、SBS；
通用塑胶：ABS、PMMA、PP、PE、AS、HDPE、LDPE。
 特种料：   PEI、PTFE、PVDF
本公司所销售之塑胶原料均可提供原厂的物性表，UL MSDS SGS COC 欢迎来电咨询！

备注：公司长期销售塑胶原料/原厂原包，25千克/包，符合ROHS认证标准，25千克起。质量有保证

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PBT注塑工艺：
　　PBT的聚合工艺成熟、成本较低，成型加工容易。未改性PBT性能不佳，实际应用要对PBT进行改性，其中，玻璃纤维增强改性牌号占PBT的70％以上。
1、PBT的工艺特性
　　PBT具有明显的熔点，熔点为225～235℃，是结晶型材料，结晶度可达40％。PBT熔体的粘度受温度的影响不如剪切应力那么大，因此，在注塑中，注射压力对PBT熔体流动性影响是明显。PBT在熔融状态下流动性好，粘度低，仅次于尼龙，在成型易发生“流延”现象。PBT成型制品各向异性。PBT在高温下遇水易降解。
2、原料准备
　　注塑前要进行干燥、要将水分含量控制在0.02％以下。采用热风循环干燥时，当温度为105℃、120℃或140℃时，所对应的时间不超过6h、4h、2h。料层厚度低于30mm。
3、注塑工艺参数
　　①注射温度 PBT的分解温度为280℃，所以实际生产中一般控制在240-260℃之间。②注射压力注射压力一般为50～100MPa。③注射速率 PBT冷却速度快，因此要采用较快的注射速率。④螺杆转速和背压 成型PBT的螺杆转速不宜超过80r/min，一般在25～60r/min之间。背压一般为注射压力的10％～15％。⑤模具温度 一般控制在70～80℃，各部位的温度差不超过10℃。⑥成型周期 一般情况下为15～60 s。