Binder degradation of sand cores
US7984750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Jan 12, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sand core is prepared for use in defining a surface of a cast metal article. The core is formed of sand particles bonded with a polyurethane resin, preferably a polyol moiety-containing polyurethane resin. An alkali metal hydroxide, and optionally a glycol, is mixed with precursors of the polyurethane before they are mixed with sand particles for molding and curing the core. The hydroxide and glycol may be encapsulated to prevent interference with core molding. The hydroxide and glycol is distributed in the polyurethane binder resin and used to reduce the decomposition temperature of the core binder during casting. This practice is particularly useful in removing core sand from castings of light metal, lower casting temperature metal alloys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.