Preparation and properties of anti-static coating based on potassium titanate whiskers/silicone rubber
By combining the color and whisker structure characteristics of FT-3000 titanium dioxide and potassium titanate shiskers(PTWs),a light colored anti-static coating of potassium titanate whiskers/silicone rubber(PTWs/SR)was prepared by using silicone rubber(SR)as the resin matrix and PTWs and FT-3000 as anti-static fillers.The effects of PTWs on the anti-static properties,mechanical properties,and thermal stability of silicone rubber anti-static coating were studied,the anti-moisture and heat aging properties of the prepared PTWs/SR anti-static coating,as well as their interfacial bonding properties to different substrates were characterized.The research results showed that,(1)The whisker structure of PTWs could compensate for the small contact area of conductive fillers caused by the continuous distribution of FT-3000 conductive powder dots.Through the synergistic effect of the two,the volume resistivity of the silicone rubber coating was further reduced,forming a more complete conductive network together.(2)The tensile strength and elongation of PTWs/SR showed an increasing trend with the increase of PTWs dosage,and the improvement tended to plateau after 7 parts.When the dosage of PTWs was 7 parts,the tensile strength was 5.71 MPa and the elongation was 83.9%,which was 102%and 26%higher than the silicone rubber coating filled with FT-3000 alone.(3)Under the combined action of PTWs and FT-3000,the heat resistance of PTWs/SR coating was significantly improved.Compared with the blank silicone rubber coating,the thermal decomposition temperature was increased by 223℃.(4)PTWs/SR coatings had excellent interfacial bonding stability and good bonding performance to various materials such as specialty rubber,organic coatings,and metals at normal,high,and low temperatures,with good applicability.(5)After aging at 85℃and 85%RH for 1 000 hours,the mechanical properties of PTWs/SR coating showed some degradation,and the decrease in elongation was greater,but overall it was controllable.The volume resistivity of PTWs/SR coating changed from 5.25×106 Ω·cm to 8.19×106 Ω·cm,indicating its good resistance to moisture and heat aging.
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