PP K8003台化批发 货源充足
价格：9.00起
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关 键 词：K8003台化批发,PP
行 业：塑料 通用/工程塑料 工程塑料
发布时间：2021-06-22
The plastics division of Taihua was originally the second division of chemical industry. In the early stage, it was established to cooperate with the development of upstream and downstream related industries in the sixth light industry plan of Formosa Plastics. At that time, it was responsible for the construction of aromatic hydrocarbon and styrene series plants. Due to the delay in the plant site of the Liuqing project, it was decided that the downstream polystyrene company should build the plant first and introduce its products into the market, so as to facilitate the production of upstream products in the future Pin.
PP化学改性：通过共聚改性、交联改性、接枝改性、添加成核剂等使PP（聚）高分子组分与大分子结构或晶体构型发生改变而提高其机械性能、耐热性、耐老化性等性能，提升其综合性能、扩大其应用领域
PP的优点：
PP虽然比回收PE有较高的机械强度和模量，但是像新PP树脂一样，回收PP的耐冲击性能尤其是耐应力开裂性能差，且低温性能差。这些性能特征是由PP聚集态结构和大分子链构造决定的，因此可用聚进行改性。回收PE(LDPE、HDPE)与收PP制共混物时，如果PP回收料比较多，可以直接制备合金，如在PP 中掺人10％一25％HDPE，其改性后的共混物在—20℃时落球冲击强度比PP提高8倍以上，而且加工流动性增加，可适用于大型容器的成型。从结构上来说PE的加入破坏了PP的结晶如大球晶碎化，也降低了PP的结晶度；若在体系中再加入EPDM。约5％可提高PP与PE的相容性，强度得到提高；加入少量EPR橡胶也可提高材料的冲击性能。
There are tertiary carbon atoms in PP molecules, which are easily broken and degraded under the action of light and heat. PP without stabilizer will become brittle when heated at 150 ℃ for more than half an hour or exed to sunlight for 12 days. PP powder without stabilizer will degrade seriously and emit obvious acid taste when stored indoors for 4 months. Adding more than 0.2% antioxidant before PP powder granulation can effectively prevent degradation and aging of PP during processing and use. Antioxidants can be divided into two categories: free radical chain reaction Terminator (also known as the main antioxidant) and peroxide decomition agent (also known as auxiliary antioxidant). The reasonable combination of the main and auxiliary antioxidants will play a good synergistic effect. If PP is cooled slowly in the air after leaving the die, it will produce larger grains and the transparency of the product is low
The comprehensive properties of PP are better than that of PE. PP products are light in weight, good in toughness and good in chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity, poor weather resistance, easy to produce "copper damage", it has the phenomenon of t shrinkage, easy aging, brittle, easy 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. PP has a certain permeability to oxygen, carbon dioxide and water vapor. Compared with nylon PA and polyester PET, PP is much worse than nylon PA and polyester PET, but it is much worse for high barrier plastics such as PVDC and EVOH. But compared with other non plastic materials, its air tightness is quite good. The air tightness can be greatly improved by adding barrier materials or coating barrier plastics on the surface. PP is a non-polar polymer with good properties
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