LNP? LUBRICOMP? PBT WFP36 compound SABIC Innovative Plastics
LNP? LUBRICOMP? PBT WFP36 compound SABIC Innovative Plastics

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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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