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关 键 词：K8802台化批发,PP
行 业：塑料 通用/工程塑料 工程塑料
发布时间：2021-05-21
台化塑胶事业部原为化工第二事业部，早期是为配合台塑企业六轻计划上下游相关产业之发展而设立，当时负责芳香烃、系列之建厂筹划，由於六轻计划案厂址之滞延，乃决定由下游之聚(Polystyrene)先著手建厂，将产品导入市场，以利将来上游产品之产销。
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
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 ℃
PP力学性能 的拉伸强度和刚性都比较好，但冲击强度较差，特别是低温时耐冲击性差。此外，如果制品成型时存在取向或应力，冲击强度也会显著降低。虽然抗冲击强度差，但经过填充或增强等改性后，其机械性能在许多领域可与成本较高的工程塑料相竞争。PP 的表面硬度在五类通用塑料中属低等，仅比PE 好一些。当结晶度较高时，硬度也相应增加一些，但仍不及PVC、PS、ABS 等。热性质在通用塑料中，PP的耐热性是。PP 塑料制品可在100℃下长时间工作，在无外力作用时，PP制品被加热至150℃时也不会变形。
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