腐蚀环境下聚乙烯丙纶复合材料抗渗性能退化研究

Anti-permeability Degradation of Polyethylene and Polypropylene Fiber Composites Under Corrosive Environment

聚乙烯丙纶作为石油化工领域一种常见的防渗辅助材料,其在长期有机废料和高浓酸碱环境侵蚀下必然产生抗渗耐久性退化,引起腐蚀物泄漏,导致环境污染,因此开展针对钻前工程防渗结构的抗渗耐久性研究十分必要。首先采用人工加速腐蚀方法,获取不同类型(单片、搭接)防渗卷材的老化试片,再对其进行不同水头压梯度的渗透试验。通过试验研究发现,随着腐蚀龄期增加,不同类型老化试片的抗渗能力均出现劣化;尤其对于搭接试片,搭接部位为其抗渗薄弱部位,其抗渗耐久性较单片试片差。另外,通过局部水泥晶防水材料补强,搭接部位抗渗耐久性得到有效提升,可满足钻前工程防渗结构体系的抗渗要求。

As a common anti-seepage auxiliary material in the field of petroleum and chemical industry, polyethylene will inevitably degrade its anti-seepage durability under the long-term erosion of organic waste and high-concentration acid and alkali environment, leading to corrosion leakage and environmental pollution. Therefore, it is necessary to analyze its anti-seepage structure’s durability of pre-drilling engineering. Firstly, the aging test sheets of different types of impermeable rolls(single sheet, lap joint) were obtained by artificial accelerated corrosion method, the experiments was done to test the different hydraulic pressure gradients. It is found that the impermeability of different types of aging specimens deteriorate with the increase of corrosion age, especially for lapped specimens, the joints are weak in impermeability, and their impermeability durability is worse than that of single specimens. In addition, the anti-permeability durability of the lap joint can be effectively improved by local cement-crystal waterproof material reinforcement, which can meet the anti-permeability requirements of pre-drilling engineering anti-permeability structure system.