Binder degradation of sand cores

Details Binder degradation of sand cores Binder degradation of sand cores

2011-07-26

2011-07-26

Lin, Kuang Y (Department: 1735)

Metal founding

Process

Shaping a forming surface

C164S525000, C164S526000, C164S528000, C523S145000

Reexamination Certificate

active

07984750

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.

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