Sand mold compositions containing as catalyst, methyl alcohol so

Details Sand mold compositions containing as catalyst, methyl alcohol so Sand mold compositions containing as catalyst, methyl alcohol so

1977-04-15

1979-08-07

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 38, 164 43, 525487, C08K 336, C08K 505, C08K 542

Patent

active

041637410

ABSTRACT:
A sand for making cores and moulds which comprises 100 parts by weight of a refractory filler, between 1.0 and 3.0 parts by weight of a binder, and between 0.4 and 2.0 parts by weight of an acid catalyst of crystal hydrate benzene-sulphonic acid in the form of an 80- to 92-percent solution in methyl alcohol.
The present invention makes it possible to prepare a sand for making cores and moulds which displays a cold setting rate and strength higher than ever before. The cold setting rate in terms of the time after mixing at which the pattern or corebox can be removed satisfactorily is not over 1 min. and the compression strength of the sand is at least 60 N/cm.sup.2 at the time of removing the pattern or corebox.

REFERENCES:
patent: 2233875 (1941-03-01), Schmidt et al.
patent: 2813846 (1957-11-01), Farber et al.
patent: 3536575 (1970-10-01), Maitrot

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