Preparation of Calcium Carbonate Superhydrophobic Coatings by Extreme Eertex Method
Large-scale engineering applications of superhydrophobic coatings have been restricted greatly owing to the high preparation cost,complex process and environmental pollution nowadays.In this work,CaCO3 whiskers and nanoparticles,water soluble styrene-acrylate emulsion,and zinc stearate were used to prepare superhydrophobic coatings,and CaCO3 whiskers and nanoparticles were used as fillers,water soluble styrene-acrylate emulsion was used as binder,and zinc stearate was used as binder hydrophobic modifier.Firstly,CaCO3 whisker and nanoparticles were surface modified.Then,superhydrophobic coatings can be fabricated based on extreme vertex design with modified CaCO3 whisker and nanoparticles,water soluble styrene-acrylic emulsion,and zinc stearate as the raw materials.And regression model was established to investigate the relationship between factor level and the contact angle.The results show that the superhy-drophobic coatings can be prepared by using CaCO3 powders with different morphologies combined with styrene-acrylic emulsion.In the region where the mixture fraction of nano-CaCO3 and zinc stearate are more and the mixture fraction of CaCO3 whisker are less,and the styrene-acrylic emulsion is moderate,the contact angle can reach up to 153.5°.Importantly,the adhesion of the coating was related to the pores on surface based on surface topography analysis.Moreover,results illustrated the surface roughness can be reduced and the superhydrophobicity can be promoted with increasing the content of CaCO3 nanoparticles.
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