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为了提高凹凸棒石(ATP)在环氧丙烯酸酯(EA)涂层中的分散性能,用4,4-二苯基甲烷二异氰酸酯(MDI)对ATP表面进行有机改性,制备了MDI接枝ATP(MDI-g-ATP)复合材料。对MDI-g-ATP复合材料的红外光谱和热分析结果证实,MDI接枝到了凹凸棒石表面。然后采用共混法制备了紫外光固化纳米MDI-g-ATP/EA复合涂层。研究了MDI-g-ATP的添加量对MDI-g-ATP/EA)涂层耐冲击力、柔韧性以及凝胶率的影响。结果表明:当MDI-g-ATP的用量为5%时,与EA涂层相比,MDI-g-ATP/EA涂层的耐冲击力的最大高度由20·cm增加至35·cm;涂膜的柔韧性由15 mm减小至5 mm;此外,与未改性的ATP相比,MDI-g-ATP在EA涂层中具有良好的分散性。
In order to improve the dispersibility of attapulgite (ATP) in epoxy acrylate (EA) coating, the surface of ATP was modified with 4,4-diphenylmethane diisocyanate (MDI) ATP (MDI-g-ATP) composites. Infrared spectroscopy and thermal analysis of the MDI-g-ATP composite confirmed that MDI was grafted onto the attapulgite surface. Then the UV-curable nano-MDI-g-ATP / EA composite coating was prepared by blending method. The effects of MDI-g-ATP on the impact resistance, flexibility and gel fraction of MDI-g-ATP / EA coatings were investigated. The results showed that the maximum impact resistance of MDI-g-ATP / EA coating increased from 20 cm to 35 cm when the amount of MDI-g-ATP was 5% The membrane flexibility was reduced from 15 mm to 5 mm; in addition, MDI-g-ATP had good dispersibility in the EA coating compared to unmodified ATP.