Binders for cores and molds
AssigneeBorden Chemical, Inc.
InventorsLeonid Zaretskiy, Robert L. Manning, Kwok-tuen Tse
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Abstract
An inorganic binder system for foundry compositions includes a silicate and added phosphate. The composition produces a binder having the advantageous strength properties of a silicate binder system with the dispersibility properties of a phosphate binder system. Methods of making and using the binder systems and the resulting products are of particular interest to the foundry art.
Claims20
A binder composition comprising:
- (a) an unreacted mixture of a water soluble silicate and a water soluble amorphous inorganic phosphate glass in an aqueous medium;
- (b) wherein the resulting mixture is a solution,
- wherein the molar ratio of SiO.sub.2 to M.sub.2 O in the silicate is from about 0.6 to about 2.0, wherein M is selected from the group consisting of sodium, potassium, lithium and ammonium.
A heat-curable binder composition comprising a water soluble silicate and a water soluble amorphous inorganic phosphate glass in an aqueous medium;
- wherein the water content of the composition being such that the composition is heat curable, wherein the molar ratio of SiO.sub.2 to M.sub.2 O in the silicate is from about 0.6 to about 2.0, wherein M is selected from the group consisting of sodium, potassium, lithium and ammonium.
An uncured, unreacted binder composition for binding particulate material comprising a mixture of a water soluble inorganic silicate and a water soluble amorphous inorganic phosphate glass, wherein the mixture is not subjected to high temperatures prior to mixing said mixture with the particulate material, wherein the molar ratio of SiO.sub.2 to M.sub.2 O in the silicate is from about 0.6 to about 2.0, wherein M is selected from the group consisting of sodium, potassium, lithium and ammonium.
A composition comprising a dry water soluble silicate component, a dry particulate component and a dry amorphous inorganic phosphate glass component.
A method of making a binder composition comprising:
- mixing a water soluble silicate and an amorphous inorganic phosphate glass in the presence of water;
- wherein the mixing is performed at ambient temperature in the absence of an aggregate, wherein the silicate has a molar ratio of SiO.sub.2 to M.sub.2 O from about 0.6 to about 2.0, wherein M is selected from the group consisting of sodium, potassium, lithium and ammonium.
Dependencies are inferred from the claim text.