台化主要业务:台化塑膠事業部主要業務為聚苯乙烯膠粒(PS) 、ABS膠粒、ASA膠粒、SAN膠粒(苯乙烯-丙烯睛共聚合物)、聚丙烯膠粒(PP)、聚碳酸酯(PC)以及 PC/ABS等合膠之製造與銷售,由於積極拓展市場及六輕上游原料廠陸續完成,形成上下游有力的整合,展望未來本部產品營銷可望繼續成長,希望本公司產品的加入,能為我國塑膠下游加工業提供品質可靠、料源穩定、價格合理之優質原料與技術支援,共同提高整體產業之競爭力而努力。
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
Although PP has higher mechanical strength and modulus than recycled PE, the impact resistance, especially stress cracking resistance, and low temperature performance of recycled PP are poor, like the new PP resin. These properties are determined by the aggregation structure and macromolecular chain structure of PP, so it can be modified by polyethylene. When the blends of recycled PE (LDPE, HDPE) and PP are made, if there are more recycled PP materials, the alloy can be directly prepared. For example, if 10% - 25% HDPE is added into PP, the impact strength of the modified blend is increased by more than 8 times than that of PP at - 20 ℃, and the processing fluidity is increased, so it can be applied to the molding of large containers. In terms of structure, the addition of PE destroys the crystallization of PP, such as the fragmentation of macrospherulites, and also reduces the crystallinity of PP; if EPDM is added into the system, the crystallization of PP is also reduced. About 5% can improve the compatibility of PP and PE, and the impact strength can also be improved by adding a small amount of EPR rubber.
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 ℃
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
Taihua PP resin (tiripro? PP resin) adopts the CHISSO gas-phase process method of Japan, uses a new generation of high activity catalyst and strict quality management system, with an annual output of 510000 tons. It can produce homopolymer and copolymer, supply injection, extrusion, fiber, blowing, vacuum molding and other processing industries. It is widely used in household appliances, auto parts, food packaging, toys and people's livelihood products.
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