Preparation of Polyurea Insulation Coating for Waterproofing and Its Properties
LUO Xueyu1, LIU Lizhu1,2
1 School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040; 2 Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080
Abstract: A polyurea waterproof coating were prepared from HDI trimer, modified D2000 and chain extender such as E300 as raw materials. By adjusting the molar ratio of modified D2000 and chain extender, the optimum synthesis process were studied. The FT-IR results have showed the modification mechanism of amino terminated polyether and molecular structure of polyurea coating. It was found that the polyurea coating had excellent water resistance and waterproof performance by comparing the volume resistivity of the coating before and after immersion in 50 ℃ water and after drying. The breakdown voltage, hardness and tensile strength test showed that the insulation performance and mechanical strength of the polyurea coating were increased with the increasing of hard content, and the polyurea of E300 as the chain extender were better on comprehensive performance than others. Combing with the elongation at break test found that when the molar fraction of E300 is 86%, the coating has good ductility and the elongation at break is 28.72%. At this time, the volume resistivity of coating film is 8.2×1010 Ω·m, breakdown field strength of coating film is 96.73 kV/mm, Shore hardness of coating film is 52.
罗学禹, 刘立柱. 防水用聚脲绝缘涂料的制备及性能研究[J]. 材料导报, 2018, 32(16): 2723-2727.
LUO Xueyu, LIU Lizhu. Preparation of Polyurea Insulation Coating for Waterproofing and Its Properties. Materials Reports, 2018, 32(16): 2723-2727.
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2018, Vol. 32 
