Moulding compositions or masses suitable for manufacturing...

Details Moulding compositions or masses suitable for manufacturing... Moulding compositions or masses suitable for manufacturing...

B - Operations, Transporting

22

C

22/190, 400/7302

B22C 1/22 (2006.01) B22C 1/16 (2006.01) C08G 18/54 (2006.01) C08L 61/02 (2006.01) C08L 75/04 (2006.01)

Patent

CA 1067637

ABSTRACT OF THE DISCLOSURE Molding compositions or masses comprising sand and a two-component binder system are prepared. These two-component binders consist essentially of 1) polyiso- cyanate and 2) a low molecular weight polymethylol pro- duced by the controlled condensation of narrow mole ratios of acetone and formaldehyde under alkaline reaction con- ditions followed by acidification and removal of sufficient water to produce a minimum solid content of at least 95%. These molding compositions cure so fast that they may be taken off the mold five minutes after having been cured with an amine curing agent, and reach a substantial bending strength within minutes of curing compared to prior art compositions which achieve comparable bending strength only after a period of as long as one hour. I

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