Mould material binding agent system which cold-hardens with form

Details Mould material binding agent system which cold-hardens with form Mould material binding agent system which cold-hardens with form

1985-12-12

1987-07-07

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524730, 524742, 524773, 524774, 524775, 528 28, 528 48, 528 85, C08L 7500

Patent

active

046788166

ABSTRACT:
This invention relates to a mould material binding agent system for the manufacture of foundry mould parts. This binding agent system contains, as components, a solution of a phenol-containing polyol having at least two OH-groups in the molecule and a polyisocyanate, optionally in the form of a solution, having at least two NCO-groups in the molecule, which react with each other to a cold-hardening binding agent with formation of polyurethane. As polyisocyanate component there are used (optionally phenyl-substituted) diphenyl-4,4', diisocyanates having a content of more than 10% by wt. (referred to the total quantity of polyisocyanate), preferably more than 20% by wt., of the isomeric diphenyl-2,4'-diisocyanate (likewise optionally phenyl-substituted), which also contain an addition of a small quantity of acid chlorides and/or chlorosilanes.
With the invention, a simply and economically manufactured binding agent is created, which combines high initial strengths of the mould parts with good sand lives of the mould material mixture.

REFERENCES:
patent: 3388120 (1968-06-01), Brizgys
patent: 3734936 (1973-05-01), Brown et al.
patent: 3965057 (1976-06-01), Ammons et al.
patent: 4558074 (1985-12-01), Torbus

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