台化主要业务:台化塑胶事业部主要业务为聚胶粒(PS) 、ABS胶粒、ASA胶粒、SAN胶粒(-睛共聚合物)、聚胶粒(PP)、聚碳酸酯(PC)以及 PC/ABS等合胶之制造与销售,由於积极拓展市场及六轻上游原料厂陆续完成,形成上下游有力的整合,展望未来本部产品营销可望继续成长,希望本公司产品的加入,能为我国塑胶下游加工业提供品质可靠、料源稳定、价格合理之优质原料与技术支援,共同提高整体产业之竞争力而努力。
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
PP分子中存在叔碳原子,在光和热的作用下较易断裂降解。未加稳定剂的PP在150℃下被加热半小时以上,或在阳光充足的地方曝晒12天就会明显变脆。未加稳定剂的PP 粉料在室内避光放置4 个月也会严重降解,散发出明显的酸味。在PP粉料造粒之前加入0.2%以上的抗氧剂可以有效地防止PP 在加工和使用过程中的降解老化。抗氧剂分为游离基链反应终止剂(也称主抗氧剂)和过氧化物分解剂(也称辅抗氧剂)两大类,主、辅两类抗氧剂的合理配合,将会发挥良好的协同效果。PP在离开口模后,如果是在空气中缓慢冷却,就会生成较大的晶粒,制品透明度低
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
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
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