碳基抗静电剂对超高分子量聚乙烯性能的影响

Effect of carbon-based antistatic agent on properties of ultra-high molecular weight polyethylene

高分子材料内衬对于提升金属油气管道服役过程中的耐腐蚀性能具有广阔应用前景,但抗静电性不佳制约了高分子材料内衬的进一步推广。采用碳基抗静电剂对超高分子量聚乙烯(Ultra-High Molecular Weight PolyEthylene,UHMWPE)进行共混改性,通过拉伸流变挤出工艺制备UHMWPE管材并测试相应性能。结果表明:抗静电剂的加入将使材料表面电阻率显著降低,抗静电剂的性能差异主要与其微观结构有关。单一抗静电剂的添加虽可有效降低UHMWPE的表面电阻率,但同时将降低UHMWPE的力学性能、耐蚀性、耐磨性及耐溶胀性等其他性能,实际应用受到限制。通过制备导电炭黑+石墨烯复合抗静电剂,并将其添加入UHMWPE中,可使UHMWPE管材在电阻率降低的同时,维持性能基本不变。研究结果可为内衬技术在成品油管输行业的应用提供参考。

Polymer lining material has a bright application prospect to improve the corrosion resistance of metal oil and gas pipelines in service,but its further popularization and application is constrained by the poor antistatic property.Therefore,the Ultra-High Molecular Weight PolyEthylene(UHMWPE)was modified by blending with the carbon-based antistatic agent.Specifically,an UHMWPE pipe was manufactured by tensile rheological extrusion process and the performance tests were conducted accordingly.The results show that,the addition of antistatic agent significantly reduces the surface resistivity of the UHMWPE material,and the property difference of these antistatic agents is mainly associated with their microstructures.The addition of a single antistatic agent can lower the surface resistivity of UHMWPE effectively,but it may also reduce the mechanical properties,corrosion resistance,wearing resistance and swelling resistance of UHMWPE,and thus its application is limited.However,the addition of the prepared compound antistatic agent of conductive carbon black and graphene into UHMWPE may reduce the resistivity of UHMWPE,while keeping the mechanical properties,corrosion resistance,wear resistance and swelling resistance of UHMWPE basically unchanged.Generally,the research results could provide reference for the application of lining technology in the products pipeline transportation industry.