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.
聚丙烯是丙烯加聚反应而成的聚合物,一种**物。系白色蜡状材料,外观透明而轻。化学式为(C3H6)x,密度为0.89~0.91g/cm3, 易燃,熔点165℃,在155℃左右软化,使用温度范围为-30~140℃ 。在80℃以下能耐酸、碱、盐液及多种的腐蚀,能在高温和氧化作用解
聚丙烯的生产工艺主要经历了溶剂法、溶液法,液相本体法(含液相气相组合式)和气相法几个发展阶段。世界上用于生产聚丙烯的工艺方法按类别划分主要有以下几大类:溶剂法、溶液法,液相本体法(含液相气相组合式)和气相法
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
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.
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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