Method of Connecting Elements made of Foamed Ethylene Copolymer and Vinyl Acetate EVA with Polyurethane

摘要

The patentable subject matter is the method for joining foamed copolymer of ethylene and vinyl acetate (EVA) with polyurethane (PU) by combining hot PU mixture with a solid substrate made of foamed EVA. The method as per the invention is intended to be used largely in footwear manufacture processes. The joining method wherein the surfaces of an element being joined made of foamed EVA (polyethylene-co-vinyl acetate) are prepared by mechanical grinding of the surface and subsequent degreasing, characterised in that the surfaces of the element made of foamed EVA (polyethylene-co-vinyl acetate) are heated to and kept at the temperature of 45-55° C. and then 2-butanol activator is applied which is then cured with UV rays for 15 seconds and subsequently POLYOL GF 422 and IZO GT 991 are heated for 10-12 hours with POLYOL being heated to 70-80° C. combining with the catalyst and IZO being heated to 65-75° C., after which the components are mixed and applied on the surface of the EVA element and next the polyurethane adhesive is applied on the surface being joined and the element prepared in this way is placed in the mould and cast with the mixture of POLY+CROS with the temperature of 51° C. and ISO with the temperature of 43° C. and then formed for 240 seconds.

主权项

1. The method of joining elements made of foamed copolymer of ethylene and vinyl Acetate—EVA with polyurethane (PU) wherein the surfaces of an element being joined made of foamed EVA (polyethylene-co-vinyl acetate) are prepared by mechanical grinding of the surfaces and by degreasing, characterised in that the surfaces of the element made of foamed EVA (polyethylene-co-vinyl acetate) are kept at the temperature of 45-55° C. and then 2-butanol activator is applied which is cured with UV rays and subsequently POLYOL GF 422 and IZO GT 991 plastic is heated for 10-12 hours with POLYOL being heated to 70-80° C. and combined with the catalyst, and IZO being heated to 65-75° C.; the components are then mixed and applied on surface of the EVA element; next, polyurethane adhesive is applied on the surface being joined and the element prepared in this way is placed in the mould and poured with the POLY+CROS mixture with the temperature of 51° C. and ISO with the temperature of 43° C. and formed for 240 seconds.