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US 12,083,584 B2Granted
Halloysite clay as smoke-reducing additive for polyurethane-forming binder system
AssigneeASK Chemicals GmbH
InventorsPaula Vivas, Matthew Shoffner, Lee Horvath
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Abstract
An amount of a halloysite clay, used as an additive in a foundry mix composition having a polyurethane-based binder system, reduces the amount of smoke emitted when molds and cores formed from the composition are exposed to molten metal, as compared to when the halloysite clay is not used.
Claims20
A foundry mix composition, comprising:
- a polyurethane binder precursor, provided in two parts, the first part comprising a polyol component and the second part comprising a polyisocyanate component;
- a liquid curing catalyst;
- a foundry aggregate;
- and
- a halloysite clay, present in the range of from about 1 to about 4 wt %, based on the weight of the foundry aggregate.
2 more elements
A method for preparing a foundry mix, comprising the steps of:
- adding a halloysite clay to a foundry aggregate and mixing, wherein the halloysite clay is present in an amount in the range of about 1 to about 4 wt %, based on the weight of the foundry aggregate;
- adding, to the mixed halloysite clay and foundry aggregate, a first part of a polyurethane binder precursor and a liquid curing catalyst and mixing, the first part of the polyurethane binder precursor comprising a polyol component;
- and
- adding a second part of the polyurethane binder precursor, the second part of the polyurethane binder precursor comprising a polyisocyanate component.
1 more element
Dependencies are inferred from the claim text.