PP BI850原料供应商

韩华达尔石化PP，PE复合厂位于中国东莞；销售办事处设在汉城，釜山，大邱，光州和大田；亚洲销售办事处分别位于北京，上海，深圳，中国香港，东京和名古屋。
The surface hardness of PP is lower than that of PE. When the crystallinity is high, the hardness also increases, but it is still lower than PVC, PS, ABS and so on. Among the five general plastics, PP has the best heat resistance. PP plastic products can work at 100 ℃ for a long time. Without external force, PP products will not deform when heated to 150 ℃. After using nucleating agent to improve the crystalline state of PP, its heat resistance can be further improved, and it can even be used to make utensils for heating food in microwave oven

PP的介电强度很高，且随温度上升而。这些都是在湿、热环境下对电气绝缘材料有利的。另一方面PP的表面电阻很高，在一些场合使用必须先进行抗静电处理。PP是高结晶塑料，它在熔点的附近时，它的液态和固态的体积相差很大，加上它收缩时的各向异性，因此易引起不均衡收缩即缩水；因此，设计制品时，尽量避免壁厚不均匀；聚丙烯的熔体粘度小，流动性好，流长比流动长度与厚度的比值大，薄壁制品可能也能注满；但同时，它的模具制作时，精度要高，否则会批峰；因它的各向异性，制品经常是变形。收缩率为18‰；溢边值为0.03mm。聚丙烯不吸水，一般不需烘干，有时为了产品质量，也可以用60℃的温度，烘干30分钟至1个小时，以排出原料中的浮水。

PP products are light in weight, good in toughness and good in chemical resistance. Disadvantages of PP: low dimensional accuracy, lack of rigidity, poor weather resistance, easy to produce copper damage, it has t shrinkage phenomenon, easy to aging, brittle, easy to deformation after demoulding. In daily life, the commonly used fresh-kee box is made of PP material. In order to prevent photoaging, it is necessary to add UV absorber into PP, which can transform the UV absorption of 290 ~ 400nm into non destructive long wavelength light. For the PP plastic products buried in the soil or used indoors in the dark, only the main and auxiliary antioxidants can be added, and the ultraviolet absorber is not needed. The shrinkage and crystallinity of PP are lower than that of PE.

The density of PP is only 0.90-0.91g/cm3, which is about 60% of PVC density. This means that more products of the same volume can be produced with the same weight of raw materials. The tensile strength and rigidity of PP are good, but the impact strength is poor, especially at low temperature. In addition, if there is orientation or stress in the molding process, the impact strength will be significantly reduced. Although the impact strength is poor, its mechanical properties can compete with high cost engineering plastics in many fields after filling or strengthening.