method for the manufacture of from 85 to 10 wt of a warmhaertbaren kunstharzes and 15 to 90 by weight fuellstoffen existing pulvergemisches for sintering

摘要

A mixture of 10-85% by weight of molten heat-hardenable synthetic resin which may include a cross-linking agent, and 15-90% of particulate filler is solidified by cooling before it thermosets and reduced to particles, which are applied and bonded by sintering to a preheated surface on which the sintered resin is then hardened. Mixing is preferably effected at the temperature at which the molten resin has the minimum viscosity. Suitable resins mentioned are epoxy resins, e.g. from bisphenol or novolaks with epichlorhydrin or glycerol dichlorhydrin; phenol-, urea-, or melamine-formaldehyde resins; butylated phenol and cresol resoles; reaction products of polyvinyl acetals with phenolpolyalcohols, e.g. trimethylolphenol; and unsaturated polyester resins. Suitable cross-linking agents for the epoxy resins are polyamines, dicyandiamide, dicarboxylic acids or their anhydrides. Suitable fillers mentioned are titanium dioxide; chromic oxide; aluminium oxide, mica, graphite, molybdenum disulphide, talc, tin, leadtin alloy, and aluminium. In examples: (1) molten epoxy resin, dicyandiamide and tin powder were mixed, cooled and crushed to a powder, which was whirl sintered on to a pre-heated grey iron casting. The resin layer was hardened by heating. (2) The mixture consisted of epoxy resin, 2,4,6-trimethylol-phenol and lead-tin alloy powder. (3) The resin was an epoxy one from epichlorhydrin and a salt of 2,4,6-trimethylolphenol or a mixture of salts of mono-, di-, and trimethylol-phenol. It was mixed with acetylated polyvinyl butyral and titanium dioxide. (4) The hardener was diethylene triamine and the filler graphite. (5) The hardener was a mixture of triethylenetetramine and butylated phenol formaldehyde resin. (6) The hardener was trimethylol phenol and the filler titanium dioxide. The compositions form good surface layers for bearings. Specification 920,497 is referred to.ALSO:A mixture of 10-85% by weight of molten heat-hardenable synthetic resin which may include a cross-linking agent, and 15-90% of particulate filler is solidified by cooling before it thermosets and reduced to particles, which are applied and bonded by sintering to a preheated surface on which the sintered resin is then hardened. Mixing is preferably effected at the temperature at which the molten resin has the minimum viscosity. Suitable resins mentioned are epoxy resins, e.g. from bisphenol or novolaks with epichlorhydrin or glycerol dichlorhydrin; phenol-, urea-, or melamineformaldehyde resins; butylated phenol and cresol resoles; reaction products of polyvinyl acetals with phenolpoly-alcohols, e.g. trimethylolphenol; and unsaturated polyester resins. Suitable cross-linking agents for the epoxy resins are polyamines, dicyandiamide, dicarboxylic acids or their anhydrides. Suitable fillers mentioned are titanium dioxide; chromic oxide; aluminium oxide, mica, graphite, molybdenum disulphide, talc, tin, lead-tin alloy, and aluminium. In Examples: (1) molten epoxy resin, dicyandiamide and tin powder were mixed, cooled and crushed to a powder, which was whirl sintered on to a pre-heated grey iron casting. The resin layer was hardened by heating. (2) The mixture consisted of epoxy resin, 2,4,6-trimethylolphenol and lead-tin alloy powder. (3) The resin was an epoxy one from epichlorhydrin and a salt of 2,4,6-trimethylolphenol or a mixture of salts of mono-, di-, and trimethylolphenol. It was mixed with acetylated polyvinyl butyral and titanium dioxide. (4) The hardener was diethylene triamine and the filler graphite. (5) The hardener was a mixture of triethylenetetramine and butylated phenol formaldehyde resin. (6) The hardener was trimethylolphenol and the filler titanium dioxide. The compositions may be applied by fluidized bed technique, dipping, pouring or rolling to continuous strip, bearings, pipes or castings made of metal, ceramic or plastic.