| 摘要 |
PURPOSE:To enable continuous mold release, by a method wherein an inner mold release agent is compounded into a reacting mixture of polyurethane and a wax series external mold release agent whose fusing point of dry solids content is more than 100 deg.C is kept applied to a mold. CONSTITUTION:A molded article made of polyurethane resin is manufactured by applying a wax series external mold release agent whose fusing point of dry solids content is more than 100 deg.C to a molding die and filling an agent obtained by compounding an internal mold release agent (for example, oleyl alcohol) with a reactive mixture such as polyisocyanate, polyol and a crosslinking agent. A plurality of times of mold releases can be performed by one time application of the mold release agent. As for the fusing point of the mold release agent, the same of more than 100 deg.C is desirable due to a matter that when the fusing point is too low, the mold release agent is mixed into the resin and when it is too high the mold release agent is apt to stick to the molded article. As the internal mold release agent is used jointly, the number of continuous mold release times is improved. |
