Patent ID: 6337041
Filing Date: 2002-01-08
Classification: B29C,B29K,B29L,C08J,C08L

Abstract:
A method for making a vulcanized elastomer capable of combining with polyurethane without the use of an adhesive, said method comprising the steps of:(a) forming a mixture by mixing in a mixer a vulcanizable elastomer, a filling agent, an active agent, an aging resistant agent, and a process aiding agent, at a temperature ranging between 150Â° C. and 160Â° C. for a period lasting less than 5 minutes; (b) transforming the mixture into flakes which are kept in an airtight chamber containing nitrogen gas and having a temperature ranging between 15Â° C. and 20Â° C. for an least 24 hours for stabilizing the physical properties of the flakes; (c) transferring the stabilized flakes to a mixer into which sulfur and a vulcanization promoting agent are introduced, and vulcanizing said flakes; (d) removing the vulcanized flakes from the mixer and arranging the flakes in a molding tool and molding the flakes to take the form of an elastomer, said molding being carried out at a temperature ranging between 150Â° C. and 160Â° C. for 5-6 minutes; (e) removing the elastomer from the molding tool and trimming the elastomer before the elastomer is soaked in an aqueous solution containing 10-15% of a non-ionic interfacial agent for 4-5 minutes for degreasing the elastomer at a temperature ranging between 70Â° C. and 85Â° C., the degreased elastomer being rinsed for 1-3 minutes with an aqueous solution containing sodium hypochlorite which contains 6-10% of effective chlorine; (f) baking the degreased elastomer; (g) coating the dry elastomer with acetoacetate solution containing 1-3% of chloro cyanuric acid before the elastomer is dried again by baking; and (h) allowing the dry elastomer to sit without disturbance in a dustproof environment for 48 hours before the elastomer is combined with a polyurethane material without the use of an adhesive.