台化塑胶事业部原为化工*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。
PP has excellent chemical stability and is inert to most acids, bases, salts and oxidants. For example, it is stable in concentrated phosphoric acid, hydrochloric acid, 40% sulfuric acid and their salts at 100 ℃. Only a few strong oxidants such as fuming sulfuric acid can change them. PP is a non-polar compound, which is very stable to polar solvents, such as alcohol, , aldehyde, ketone and most carboxylic acids, but it is easy to dissolve or swell in some non-polar organic solvents
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
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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