Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-01-24
1979-11-27
Person, Sandra M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
164 16, 260 37R, 260 38, 260395B, C08K 336
Patent
active
041761146
ABSTRACT:
Sand molds or cores are prepared by coating sand particles with an acid-curing condensation type resin consisting of poly furfuryl alcohol or admixtures of poly furfuryl alcohol with other acid-curing resins. The resin composition is formed into a desired shape and is cured at ambient temperature over a period of between a few seconds and a few minutes by means of an acid produced by in situ oxidation of sulfur dioxide. Sulfur dioxide is introduced into the molding composition together with an oxidizing agent which effects oxidation of the sulfur dioxide within the mold or core composition. Preferably, the oxidizing agent is an organic peroxide incorporated on the sand or introduced with the resin composition. The formation of sand cores or molds from resins comprising poly furfuryl alcohol results in products having improved tensile strengths, improved hardness, and characterized by virtually no migration or furfuryl alcohol polymers to or coating of the molds or patterns used in sand core or mold preparation.
REFERENCES:
patent: 2813846 (1957-11-01), Farber et al.
patent: 3008205 (1961-11-01), Blails
patent: 3184814 (1965-05-01), Brown
patent: 3879339 (1975-04-01), Richard
Stewart Patrick H.
Woodson Wayne D.
C L Industries Inc.
Mosely Neal J.
Person Sandra M.
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