Process for preparing mold

Details Process for preparing mold Process for preparing mold

1979-09-17

1981-05-26

Baldwin, Robert D.

Metal founding

Process

Shaping a forming surface

106 382, 164 43, 260 4211, 260 4213, B22C 122, B22C 912

Patent

active

042692563

ABSTRACT:
A mold with an increased compression strength and a good collapsibility is prepared with a good efficiency by mixing refractory particles with a binder material comprising a caustic alkali-neutralized product of a copolymer containing a carboxyl group and calcium hydroxide, thereby preparing molding materials, filling the molding materials around a pattern, and blowing CO.sub.2 gas into the mold sand, thereby hardening the molding materials. Polyvinyl alcohol, calcium oxide, at least one hydroxide of zinc, aluminum, barium, magnesium, and iron, SBR latex, etc. can be added to the binder material, when desired.

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patent: 4162238 (1979-07-01), Bergna
patent: 4163000 (1979-07-01), Kashima et al.

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