在分散稳定的纳米碳酸钙浓缩浆中,Sa10超分散剂牢固吸附在纳米碳酸钙表面并形成吸附层.纳米碳酸钙浓缩浆提高了环氧涂层的附着力和耐腐蚀性.吸附层的空间位阻效应阻碍纳米碳酸钙粒子间的聚集,且溶剂化层使纳米碳酸钙从极性向非极性转变,提高其与环氧树脂的相容性,保障其在环氧涂料中均匀性和稳定分散.因此,纳米碳酸钙浓缩浆增强了涂层的物理屏蔽作用,使涂层的耐蚀性提高.
In highly-dispersed and stable nano-CaCO3 concentrates,the Sa10 hyperdispersant firmly adsorbed on the surface of CaCO3 nanoparticles and a adsorptive layer formed.Nano-CaCO3 concentrates improved the epoxy coating adhesion and the corrosion resistance.A adsorptive layer produced steric effect and hindered the nano-CaCO3 particles to aggregate,while the solvatable layer transfered nano-CaCO3 particles from the polarity shift to nonpolarity,increasing their compatibility with the epoxy resin,which ensured their uniformity and stable dispersion in the epoxy coatings.Thereby nano-CaCO3 concentrates enhanced the physical shielding of the coatings,and improved the corrosion resistance.
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