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.
聚是加聚反应而成的聚合物,一种有机物。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
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
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。
PP台化订购说明:
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2.客户以本批材料加工导致的成品的瑕疵由客户自己负责。
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