Self-hardening moulding mixture for making foundry moulds and co

Details Self-hardening moulding mixture for making foundry moulds and co Self-hardening moulding mixture for making foundry moulds and co

1976-04-09

1978-09-05

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 383, 106 85, 164 37, B28B 734

Patent

active

041117050

ABSTRACT:
A self-hardening moulding mixture for making foundry moulds or cores, comprising moulding sand, orthophosphoric acid, a ferrous oxide-containing material, a water-soluble salt of an alkali metal or ammonium, and a carboxylic acid having one dissociation constant not exceeding 10.sup.-4 or a water-soluble salt of an alkali metal or ammonium, and an isopolyacid formed by a chromium subgroup metal, manganese oxide or urea.
The self-hardening moulding mixture can also comprise a surface-active substance acting as a foaming agent in order to render the mixture to a fluid state and to avoid compacting when producing moulds and cores therefrom.
The moulding mixture features an enhanced bench life (10-15 min) and ensures a sufficiently high hardening and strength rates (compression strength is equal to 10-25 kg/cm.sup.2) for the foundry moulds and cores produced therefrom.

REFERENCES:
patent: 2072212 (1937-03-01), Moosdorf et al.
patent: 2161319 (1939-06-01), Schamberger
patent: 2450952 (1948-10-01), Greger
patent: 2522548 (1950-09-01), Streicher
patent: 2610957 (1952-09-01), Steinman et al.
patent: 3316110 (1967-04-01), Herbst

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