Preparation and properties of antistatic silicate coating
[Introduction] Inorganic antistatic coatings have the advantages of environmental friendliness, high performance/price ratio, and good weatherability. [Method] A novel antistatic coating was prepared with high-modulus potassium silicate solution (M = 5.5) as the binder, graphite and alumina powder as the fillers, fluorocarbon emulsion as the toughener. The effects of the solid content and the mass ratio of graphite to alumina on the pencil hardness, wear resistance, tensile adhesion strength, and microstructure of the coating were studied. The variation of surface resistance with coating thickness was analyzed. [Result] The coating with a solid content of 32％ and a thickness of 95 μm prepared at a mass ratio of graphite to alumina 10.0:9.5 had a smooth surface, an order of magnitude of surface resistance of 104 Ω, a pencil hardness of 9H, a wear loss of 0.0227 g, and a tensile adhesion strength of 2.350 MPa, showing the optimal mechanical properties. [Conclusion] For antistatic silicate coatings, graphite is suitable as a conductive filler to enhance their conductivity, and alumina is suitable as a reinforcing filler to enhance their mechanical properties.
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