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一、研究扩散的意义塑料化工设备,由于化学介质作用而使塑料设备性能下降以至失去使用价值,一般有以下几种形式: 1、化学作用:化学介质向塑料内部扩散渗透,并发生破坏分子主价键的氧化、水解等化学反应。 2、物理作用:化学介质扩散渗透至塑料内部,并破坏高分子次价键。宏观上表现为增塑软化,膨胀、龟裂、强度降低、分层、甚至溶解。 3、与助剂作用:化学介质扩散渗透至塑料内部,与塑料中的填料、增塑剂、抗氧化剂等发生化学反应或溶解、萃取等物理作用,使塑料结构变化,物理机械性能下降。
First, the significance of the study of the proliferation of plastic chemical equipment, due to the role of chemical media so that the performance of plastic equipment and even lose the value of the use of lost, generally have the following forms: 1, chemical: chemical medium to the plastic diffusion infiltration, and the destruction of the main Price bond oxidation, hydrolysis and other chemical reactions. 2, the physical role: the diffusion of chemical media penetrate into the plastic interior, and destroy the polymer secondary bond. Macroscopically, plasticized, expanded, cracked, reduced in strength, delaminated and even dissolved. 3, and the role of additives: chemical media diffusion into the plastic infiltration, and plastic filler, plasticizers, antioxidants such as chemical reaction or dissolution, extraction and other physical effects, the plastic structure changes, the physical and mechanical properties decline.