A kind of preparation method of composite microsphere coating with adjustable hydrophobicity

Abstract

The invention belongs to the field of hydrophobic materials, and in particular relates to a preparation method of a composite microsphere coating with adjustable hydrophobicity. Modified with KH-570 respectively; then cross-linked with vinyl-terminated polydimethylsiloxane (VS 500) and hydrogen-containing silicone oil XL-1341 to prepare silicone rubber microspheres; then these two microspheres were passed through The composite microspheres are obtained by hydrosilylation and compounding; finally, the composite microspheres coating with adjustable hydrophobicity is prepared by dispersing the composite microspheres in n-hexane. The present invention prepares silica pellets with different particle sizes by compounding with silicone rubber microspheres by hydrosilylation to prepare compound microspheres with double size roughness with different size ratios, so as to adjust the hydrophobicity by adjusting the host-guest size ratio , and finally obtain a microsphere coating with high hydrophobicity and high adhesion.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a preparation method of composite microspheres with adjustable hydrophobicity. Background technique [0002] There are also many hydrophobic surfaces in nature, even showing superhydrophobicity (static water contact angle > 150°, rolling angle < 10°). The surface has a certain roughness to obtain self-cleaning properties. Among them, there are some special super-hydrophobic phenomena. For example, the water droplets on rose petals satisfy the super-hydrophobic static contact angle, but the water droplets are not easy to roll off and have high adhesion. This phenomenon is called "rose petal effect". Inspired by the "lotus leaf effect" and "rose petal effect", constructing a superhydrophobic surface can construct a certain roughness on the hydrophobic surface. Improve the hydrophobicity of the surface. [0003] Raspberry-shaped composite microspheres are com...

AI Technical Summary

Problems solved by technology

Among them, in CN201711361540.2, a method for preparing superhydrophobic micro-nano spheres based on silicone rubber microspheres, the surface is first synthesized to contain Si-H silicone rubber microspheres, and then the surface of the silicone rubber microspheres is coated with nano-scale Silica thus obtains micro-nano balls, which also need to add polysiloxane to guide more free nano-silica of grafted silane coupling agent to the surface of silicone rubber microspheres, increasing the resistance to silicone rubber. The coating rate of the microspheres improves the hydrophobicity of the superhydrophobic micro-nano spheres. If polysiloxane is not included, the static water phase contact angle of the silica-coated silicone rubber microspheres is only 136°. Difficult to achieve superhydrophobicity

And the inventors have further studied and found that the Si-H bond content on the surface of the prepared silicone rubber microspheres is higher, and there are more sites for the compounding of silica beads, so when silica with a comparable particle size and When the silicone rubber microspheres are compounded, more small balls will be compounded, resulting in a decrease in the distance between the microstructures, and it is more inclined to the Cassie state, making it easier for water droplets to roll off, resulting in poor adhesion of the micro-nano balls

[0005] And it and other existing technologies have not studied the regulation of the size ratio of the two microspheres and the influence of the host-guest size ratio on its hydrophobic properties.

Images