PBT WP004

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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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 PBT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 注塑机选用螺杆式注塑机时。应考虑如下几点。 　　

①制品的用料量应控制在注塑机额定最大注射量的30％～80％。不宜用大注塑机生产小制品。 　　

②应选用渐变型三段螺杆，长径比为15～20，压缩比为2.5～3.0。 　　

③应选用自锁式喷嘴，并带有加热控温装置。 　　

④在成型阻燃级PBT时，注塑机的有关部件应经防腐处理.

3.制品与模具设计

　　①制品的厚度不宜太厚，PBT对缺口很敏感，因此，制品的直角等过渡处应采用圆弧连接。 　　
②未改性PBT的成型收缩率较大，在1.7％～2.3％，模具要有一定的脱模斜度。 　　

③模具需要设排气孔或排气槽。 　　

④浇口的口径要大。 　　

⑤模具需设置控温装置。模具最高温度不能超过100℃。 　　

⑥阻燃级PBT成型，模具表面要镀铬，以防腐

4 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.

?5注意事项

①再生料的使用 再生料与新料的比例一般在25％～75％。 　
②脱模剂的使用 一般情况下不使用脱模剂，必要时可采用有机硅脱模剂。 　　
③停机处理 PBT的停机时间在30min以内，可将温度降到200℃时停机。长期停机后再生产时，要将料筒内的料排空，再加入新料才能进行正常生产。 　　
④制品的后处理 一般情况下不需要进行处理，必要时在120℃时处理1～2h