采用静态腐蚀试验考察试样浸泡前后的重量变化,外观变化,机械性能(硬度和冲击强度)变化以及结构的变化,研究了聚丙烯塑料在衣康酸水溶液中的腐蚀行为。结果表明,聚丙烯在衣康酸中的腐蚀主要包括介质的扩散渗透、助剂溶出和聚丙烯树脂的氧化,介质组成和温度有显著影响。经衣康酸介质浸蚀后,聚丙烯的硬度变化不大,但冲击强度有所下降。根据重量、外观及性能的情况,认为聚丙烯塑料在衣康酸介质中的耐腐蚀性良好。
The corrosion behaviour of polypropylene (PP) plastics was studied by examining the weight change, appearance, mechanical properties (hardness and impact strength) and molecular structure of specimens after immersion in itaconic acid aqueous solutions. It was found that the corrosion of PP plastics could be attributed to the diffusion and permeation of the media, dissolution of certain assistants and oxidation of PP resin, which were dependent on the composition and temperature of the media. As a result, the impact strength of the plastics decreased to some extent whereas the hardness remained almost unchanged. It could be concluded that the corrosion resistance of PP plastics in itaconic acid aqueous solutions was quite good.
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