Preparation and properties of water-based thermal insulation coating with low water absorption
[Introduction]With the wide application of water-based thermal insulation coatings in the field of industrial painting,it is urgent to solve the problem of decreasing thermal insulation performance caused by its high water absorption.[Method]A water-based thermal insulation paint with low water absorption was prepared by using styrene-acrylic emulsion as binder and hollow glass beads modified by coupling agent as thermal insulation filler with the thermal conductivity and water absorption as the main performance indexes.The hollow glass beads treated with different coupling agents were characterized by Fourier-transform infrared spectroscopy(FT-IR).The microstructure and morphology of the coatings were examined by scanning electron microscopy(SEM).The thermal conductivity,mechanical properties,and adhesion of the coatings were compared before and after immersion in water.[Result]The modification effectiveness of aluminate coupling agent was better than that of silane coupling agent.The comprehensive performance of the coating prepared with 25％(mass fraction)of aluminate coupling agent modified hollow glass beads was the best:water absorption rate 9.32％after 24 hours of immersion in water,as well as thermal conductivity 0.122 8 W/(m·K),tensile strength 2.45 MPa,elongation at break 28.37％,and pull-off adhesion strength 2.32 MPa after 168 hours of immersion in water.[Conclusion]The surface modification of hollow glass beads with appropriate coupling agent can effectively improve the compatibility of organic-inorganic interface in thermal insulation paint system,thus reducing the water absorption of the cured coating and enhancing its mechanical properties.
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