Preparation and Properties of Hydrophobic Wear-resistant UV-curable Polysiloxane Coating
UV-curable precursors were synthesized by a one-pot method using hydrogen-containing silicone oil,1,2-epoxy-5-hexene and arylphenyl ether as raw materials via silica-hydrogen addition reaction.And a series of fluorine-free polysiloxane coatings were obtained by UV curing.The effects of crosslink density and aromatic group content on the properties of UV-cured polysiloxane coatings were investigated by testing static water contact angle,abrasion resistance,transmittance,adhesion and hardness.The results show that the increase of crosslinking density was favourable to the adhesion of the coating,however,too high crosslinking density affects its transparency.Aromatic groups can improve the hydrophobicity of the coating due to their low polarity,but excessive levels can lead to reduced coating adhesion.When the number of epoxy groups and benzene rings is 1:1,namely coating PSO-3,the adhesion level is class 1,the transmittance at 800 nm is 86.71%,and the static water contact angle is up to 104°.At the same time,due to the introduction of rigid aromatic groups,the coating PSO-3 also has good wear resistance,with a water contact angle of 98° even after 20 friction cycles.
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