초록 ▼

A method of producing three dimensional polyurethane shapes by spray molding a quasi-gel like polymer precursor composition that is first mixed and then sprayed by a spray gun. The spray coating of quasi-gel polymer precursor composition subsequently cures to form a molded polyurethane polymer shape

A method of producing three dimensional polyurethane shapes by spray molding a quasi-gel like polymer precursor composition that is first mixed and then sprayed by a spray gun. The spray coating of quasi-gel polymer precursor composition subsequently cures to form a molded polyurethane polymer shape. Such artificial three dimensional shapes may include rocks, rock walls or faces, tree stumps or limbs, animals, architectural features or settings in which a certain visual appearance is desired. The method includes: creating a mold and supporting cradle having a mold cavity conforming to the exterior of shape desired, the mold having a substantial degree of flexibility; spraying a quasi-gel polymer precursor composition into the mold cavity, the quasi-gel polymer precursor composition comprising a mixture of an isocyanate portion and a curative portion and being mixed prior to introduction into a spray gun, carrying out the spraying to build up the molded three dimensional shape to a desired thickness and stripping the cradle and mold from the molded polyurethane three dimensional shape after the curing of the quasi-gel polymer precursor.

대표청구항 ▼

1. A method of making a molded polyurethane three dimensional shape, the method comprisingcreating a mold and supporting cradle having a mold cavity conforming to the exterior of shape desired, said mold having a substantial degree of flexibility; spraying a quasi-gel polymer precursor composition i

1. A method of making a molded polyurethane three dimensional shape, the method comprisingcreating a mold and supporting cradle having a mold cavity conforming to the exterior of shape desired, said mold having a substantial degree of flexibility; spraying a quasi-gel polymer precursor composition into the mold cavity, said quasi-gel polymer precursor composition comprising a mixture of an isocyanate portion and a curative portion and being mixed prior to introduction into a spray gun, carrying out said spraying to build up the molded three dimensional shape to a desired thickness and stippling said cradle and mold from the molded polyurethane three dimensional shape after the curing of said quasi-gel polymer precursor, wherein the curative portions of the quasi-gel polymer precursor includes a rigid polymer resin, a gelling agent, a flexible polymer resin, a molecular sieve drying agent, a crosslinking agent, a suspension agent and a polymerization co-catalyst, and wherein the rigid polymer resin is a combination of penta erythritol base quadra functional polyol and a polyether base triol, the gelling agent is a aromatic diamine the flexible polymer resin is a polyether base triol, the molecular sieve drying agent is an aluminosilicate, the crosslinking agent is selected from aldimines, ketimines and oxazolidines, the suspension agent is a mixture of salts from alkylamides and esters, and the polymerization co-catalyst is phenyl mercuric neodecanoate.