Fremgangsmåde til overfladebehandling af beton- eller metalflader.

摘要

Coating compositions comprise an epoxide resin, a flexibility-imparting agent, one or more hardeners and powdered or granular corundum and/or silicon carbide. The flexibility-imparting agent may be a monomeric epoxide having not more than 6 carbon atoms, the glycidyl ether of an aliphatic alcohol or mercaptan, or a dialkyl ester of b -dithiopropionic acid. The hardeners may be amino compounds such as aliphatic, cyclo-aliphatic or aromatic polyamines, polyethers of oxyamines and polyhydric alcohols, amino compounds of tetrahydropyridine or of piperidine, or the amidoamines formed from polyamines and polymerized unsaturated fatty acids; or mercapto compounds. An accelerator such as a phenol, aminophenol or alcohol, and a thixotropic agent such as bentonite or finely divided silica may also be added. The epoxide resins used, are liquid at room temperature and have at least 2 epoxide equivalents per molecule; suitable resins are glycidyl ethers of polyhydric phenols, preferably diglycidyl ethers of 4, 41-dihydroxydiphenyl-propane. Mixtures of such ethers with ethers of polyhydric alcohols or N-glycidyl compounds may also be used.ALSO:A surface is coated with a primary coating at least 60m thick comprising an epoxide resin, a flexibility-imparting agent, one or more hardeners and from 10-200% by weight of the resin of powdered corundum and/or silicon carbide having a grain size of from 5-60m and thereafter applying to the primary coating at least one additional coating comprising epoxide resin, flexibility-imparting agent, hardener(s) and granular corundum and/or silicon carbide having a particle size in the range of from 0,07-2 mm. The additional coating, or the final additional coating if more than one additional coating is applied, may be applied from a mixture of all four components, or may be applied in two stages, the resin, flexibility-imparting agent and hardener(s) being applied first followed by the granular material, which is scattered on the surface and then rolled in. The flexibility-imparting agent may be a monomeric epoxide having more than 6 carbon atoms, the glycidyl ether of an aliphatic alcohol or mercaptan, or a dialkyl ester of b -dithiopropionic acid. The hardener may be an amino compound, of which many examples are given, or a mercapto compound; a phenolic accelerator may also be included. The coatings may be applied by brushing or trowelling to concrete or to shot-blasted iron or aluminium sheets.