PP RJ700原料供应商

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 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

The dielectric strength of PP is very high and increases with the increase of temperature. These are beneficial to electrical insulation materials in wet and hot environment. On the other hand, the surface resistance of PP is very high, so antistatic treatment must be carried out in some occasions. PP is a high crystalline plastic. When it is near the melting point, the volume difference between its liquid and solid state is very large. In addition, the anisotropy of its shrinkage makes it easy to cause uneven shrinkage, that is, shrinkage. Therefore, when designing products, try to avoid uneven wall thickness. Polypropylene has small melt viscosity, good fluidity, and the ratio of flow length to flow length to thickness is large. Thin wall products may also be able to be injected But at the same time, when making the mold, the precision should be high, otherwise it will batch peak; because of its anisotropy, the product is often deformed. The shrinkage rate was 18 ‰ and the overflow value was 0.03mm. Polypropylene does not absorb water and generally does not need to be dried. Sometimes, for the sake of product quality, it can be dried at 60 ℃ for 30 minutes to 1 hour to discharge the floating water in the raw material.

Different screw forms can be used according to different needs. In general, single screw extruder, double wave screw extruder or double wave screw extruder are usually used. Only in the production of special materials, twin-screw extruder is used. However, it is sible to fill with calcium carbonate or talcum powder, and to select single screw or twin-screw extruder. It is called blending modification that mechanical method is used to add other polymers into the polymer to change its properties. The comprehensive properties of PP are better than that of PE

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。