Process for the production of porous ceramic molded articles
AssigneeThe Toyo Rubber Industry Co., Ltd.
InventorsShigeyoshi Fukushima, Masaaki Mizuno, Hideaki Koga
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Abstract
A process for the production of a porous ceramic mold is described, compsiging adding about 40 to 60 parts by weight of water to 100 parts by weight of a ceramic material, mixing the thus-formed ceramic slurry with about 20 to 40 parts by weight of a hydrophilic urethane prepolymer having a free isocyanate group content of from about 4% to 7% by weight, reacting and foaming the resulting mixture after the introduction thereof into a mold, drying the thus-formed foamed urethane molded article, and combusting very slowly and sintering the dried foamed urethane molded article to produce a porous ceramic molded article.
Claims8
A process for producing a porous ceramic molded article comprising
- adding from about 40 to 60 parts by weight of water to 100 parts by weight of a ceramic material to prepare a ceramic slurry,
- adding to said slurry from about 20 to 40 parts by weight of a hydrophilic urethane prepolymer having a free isocyanate group content of from about 4% to 7% by weight, which is prepared by reacting an ethylene oxide-propylene oxide copolymer having an average molecular weight of from about 1,500 to 3,500 and an ethylene oxide content of from about 70% to 90% by weight and a polyisocyanate compound containing at least two isocyanate groups at the terminal portions thereof,
- introducing the resulting hydrophilic urethane prepolymer-ceramic slurry mixture into a mold,
- reacting and foaming the mixture to form a foamed urethane molded article,
- drying the thus-formed foamed urethane molded article, and
- combusting very slowly and sintering the foamed urethane molded article to produce a porous ceramic molded article.
Dependencies are inferred from the claim text.