韩国道达尔PP HJ488

Hanwha total is a joint venture between Hanwha and total, more specifically, a joint venture between Samsung integrated chemicals and total petrochemical. Hanhua and total each hold 50% of the company.
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。

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.

Calcined kaolin is added to improve the electrical insulation of PP, Adding wollastonite needle shape can enhance the surface hardness of PP, increase the surface gloss and material density of PP products by adding precipitated barium sulfate barite powder. Aluminum hydroxide and magnesium hydroxide brucite powder are used as flame retardants to achieve the triple effects of filling, flame retardancy and smoke elimination. Conductive plastics are made by adding carbon black. PP achieves permanent antistatic effect and improves light aging resistance Metal powder is used to make conductive plastics to achieve permanent antistatic effect. Wood powder is added to reduce cost and facilitate resource recycling. Graphite, molybdenum disulfide and polytetrafluoroethylene are added to improve lubricity and reduce friction. For PE, PP and PVC ternary blends, in addition to compatibilizers CPE and EPR, alloy can also be prepared by reactive extrusion technology.

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.

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