Manufacturing method of urethane foam molded products

Details Manufacturing method of urethane foam molded products Manufacturing method of urethane foam molded products

1992-05-18

1994-04-12

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 51, 264338, B29C 6722, B28B 736

Patent

active

053023269

ABSTRACT:
In manufacturing molded product of urethane foam, a releasing agent mainly composed of organopolysiloxane is applied on the inner surface of the mold maintained at 60.degree. C. The agent is prepared by dissolving the base composed of organopolysiloxane composition in an organic solvent. The organopolysiloxane composition comprises (a) a first organopolysiloxane of which 0.1 to 5.0% of all organic groups bonded with Si atoms are vinyl groups and at least 80% of the remaining organic groups are methyl groups, and (b) a second organopolysiloxane containing at least three Si bonded hydrogen atoms in one molecule, wherein the first and second organopolysiloxanes contain Si vinyl groups and SiH groups at a ratio in a range of 1:0.5 to 1:5, and do not substantially contain unreactive siloxane. The agent is cured by irradiation with ultraviolet rays, and a thin and uniform film of releasing agent is formed on the inner surface of the mold. Inside the mold coated with this film of releasing agent is injected a raw liquid of urethane foam of cold cure-type, and after the curing step, a molded product of urethane foam in a desired shape is manufactured.

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