韩国道达尔PP BJ700

韩华道达尔石化总部位于首尔，由13个独立工厂组成的大型石化联合于忠清南道省大山。公司拥有1100名员工，总裁兼执行官为Son Seog-won。
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.

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

加煅烧高岭土提高PP电绝缘性,加硅灰石针状有一定增强效果、提高PP表面硬度，加沉淀硫酸钡重晶石粉提高PP制品表面光泽、材料密度，加氢氧化铝、氢氧化镁水镁石粉作为阻燃剂使用，达到填充、阻燃、消烟三重效果，加炭黑制作导电塑料，PP达到*抗静电效果，提高耐光照老化性，加金属粉末制作导电塑料，达到*抗静电效果，加木粉降低成本、有利资源再生利用，加石墨、二硫化钼、聚四氟乙烯提高润滑性、减小摩擦力，对于PE、PP、PVC 三元共混物，除了加人相容剂CPE、EPR 外，还可利用反应挤出技术制备合金。如用马来酸酐或马来酸酯进行接枝反应来增容。在此方法中塑化、接枝反应、共混在螺杆挤出机中进行，能一次完成，要求螺杆挤出机的螺杆长径比在40左右，中间有排气和加料口，螺杆挤出机可以是单螺杆挤出机也可以是双螺杆挤出机。

可以根据不同的需要采用不同的螺杆形式。通常情况下多采用单螺杆挤出机或双波状螺杆挤出机或双波状螺杆挤出机，只有在特殊料的生产上采用双螺杆机挤出机，不过对用碳酸钙填充或滑石粉填充、选用单螺杆或双波状螺杆挤出设备完全可以实现。采用机械的办法，在已经生成的聚合物中加入其它聚合物，使其性能发生变化称之为共混改性。以聚丙烯为主体的共混改性可以达到的各种效果.PP 的综合性能优于PE 料。PP 产品质轻、韧性好、耐化学性好。PP的缺点：尺寸精度低、刚性不足、耐候性差、易产生铜害，它具有后收缩现象，脱模后，易老化、变脆、易变形。日常生活中，常用的保鲜盒就是由PP 材料制成。为防止光老化需要在PP 中加入紫外线吸收剂，它可将波290~400nm 的紫外线吸收激化转化为没有破坏性的较长波长的光线。对于埋在土壤中或在室内避光使用的PP 塑料制品仅加入主辅抗氧剂即可，无须加入紫外线吸收剂。PP 的收缩率和结晶度比PE 低。