Method for forming sand cores and molds

Details Method for forming sand cores and molds Method for forming sand cores and molds

1982-08-05

1984-05-15

Hayes, Lorenzo B.

Metal founding

Process

Shaping a forming surface

106 382, 164526, 164527, 523144, 523145, B28B 734

Patent

active

044482345

ABSTRACT:
A hydrogen peroxide system or composition for use in resin polymerization comprises a mixture of a major part of concentrated (70%) hydrogen peroxide admixed with minor amounts of phosphoric acid, a halo-substituted acid, such as hydrochloric acid, fluoboric acid or hydrofluoric acid, and sodium perborate. The peroxide composition is characterized by its storage stability, resistance to detonation, zero flammability, ease of handling and improved catalytic properties in the polymerization of certain resins. This hydrogen peroxide composition is compatible for use with a variety of organic peroxides which have been used for resin condensation polymerization and may be used in conjunction therewith. This hydrogen peroxide composition may be safely mixed with resins and resin prepolymers on the sand prior to use. The peroxide composition, added with other peroxides, and with an acid curable condensation-type resin precursor or prepolymer to sand, formed into cores or molds, and gassed with sulfur dioxide, and optionally purged with air, at a temperature from room temperature to about 300.degree. F. for a time from a fraction of a second to several minutes forms superior sand cores and molds.

REFERENCES:
patent: 3008205 (1961-11-01), Blaies
patent: 3020609 (1962-02-01), Brown
patent: 3059297 (1962-10-01), Dunn et al.
patent: 3108340 (1963-10-01), Peters et al.
patent: 3145438 (1964-08-01), Kottke et al.
patent: 3184814 (1965-05-01), Brown
patent: 3525379 (1970-08-01), Johnson et al.
patent: 3639654 (1972-02-01), Robins
patent: 3879339 (1975-04-01), Richard

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