ACTIVATOR FOR ACCELERATED ADHESION DEVELOPMENT

摘要

The present invention relates to an activator composition comprising a) between 0.5% and 50% by weight of a catalyst K for crosslinking two-component adhesives which is liquid at 23°C, b) between 40% and 99.5% by weight of an organic solvent L, c) between 0% and 10% by weight of at least one silane S comprising at least one hydrolysable silane group and preferably at least one functional group selected from mercapto, epoxy, amino, methacryloyl, vinyl and alkyl, characterized in that the catalyst K comprises a 1,3-ketoamidate complex of a metal and that the solvent L is selected from the group of acetone, methyl ethyl ketone, methyl n-propyl ketone, diisobutyl ketone, methyl isobutyl ketone, methyl n-amyl ketone, methyl isoamyl ketone, acetylacetone, mesityl oxide, cyclohexanone, methylcyclohexanone, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, n-butyl propionate, diethyl malonate, 1-methoxy-2-propyl acetate, 3-methoxy-n-butyl acetate, ethyl 3-ethoxypropionate, diisopropyl ether, diethyl ether, dibutyl ether, diethylene glycol diethyl ether, ethylene glycol diethyl ether, ethylene glycol monopropyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylbenzene, toluene, xylene, heptane, octane, naphtha, white spirit, petroleum ether, benzine, methylene chloride, methanol, ethanol, isopropanol and mixtures of these solvents. The activator composition according to the invention is storage stable for at least one month, preferably at least 2 months, in particular at least 4 months or longer without showing precipitation of the catalyst or of the silane. The activator composition is moreover active independently of the applied amount and may be applied in layers having a thickness such that the adhesive may be applied after not more than 30 seconds. The activator composition may moreover accelerate a 2-component polyurethane adhesive in respect of adhesion development on the substrate such that after not more than one hour after application of the 2017-0055WO 27 / 27 adhesive and curing at room temperature at least 10% of the adhesive bond tensile shear strength achieveable after 24 h of storage at room temperature has already been achieved, wherein the fracture pattern is just as cohesive after 1 h as after 24 h.