碳纤维/丙烯酸聚氨酯导电涂料制备及其性能研究

Preparation and Property of Carbon Fiber/Polyurethane Acrylate Conductive Coating

目的 研究碳纤维含量、助剂（分散剂、防沉剂）及涂层厚度等因素对涂层表面电阻的影响。方法 以丙烯酸聚氨酯为基料,以短切碳纤维为导电填料,通过添加不同助剂制备了系列不同碳纤维含量的碳纤维/丙烯酸聚氨酯导电涂料及其涂层,对涂层的表面电阻进行了测试分析。结果 碳纤维含量与涂层的表面电阻直接相关,综合涂层电性能及力学性能这两方面因素,碳纤维在涂层中的含量在4%～8%（质量分数）范围内为宜。分散剂的加入可降低涂层的表面电阻,分散剂的用量为碳纤维质量的12%～14%为宜。防沉剂的加入会导致涂层表面电阻上升,考虑涂层防沉效果和电阻两方面因素,防沉剂用量在0.5%～1.5%（质量分数）之间为宜。碳纤维导电涂层在施工中宜采用2～4道喷涂,厚度应控制在10～30μm之间。结论 短切碳纤维、防沉剂、流平剂等助剂以及涂层厚度对于涂料导电性能有一定程度的影响,需根据实际需求优化配方和工艺,达到最佳导电能力。

Objective To study the influence of carbon fiber content, additives （dispersing agent and anti settling agent） and coating thickness on the surface resistivity of coating. Methods With polyurethane as base material and short cut carbon fiber as conductive filler, a series of different carbon fiber contents of carbon fiber/PU conductive coating and coating were prepared by adding different additives. Surface resistivity of the coating was tested and analyzed. Results The carbon fiber content was directly related to the surface resistance of coating. Considering the electric properties and the mechanical properties of coating, carbon fiber content in the coating was set at 4%-8% appropriately. Dispersing agent added could reduce the surface resistivity of the coating. Dispersing agent content was set at 12%-14% appropriately. Anti settling agent added would lead to a rise in the coating surface resistivity. Considering the coating anti settling effect and the resistance factors, the anti settling agent was set at 0.5%-1.5% appropriately. Carbon fiber conductive coating in construction should be sprayed by 2-4 layers and the thickness should be controlled at 10-30 p.m. Conclusion Short cut carbon fiber, anti settling agent, leveling agent and other additives and coating thickness have a certain degree of influence on the conductive properties of the coating. It is necessary to optimize the formulation and technology according to the actual demand so as to achieve the best conductive capability.