A method for preparing a novolak phenol-formaldehyde resin, a method for making resin coated granules for foundry moulding and a foundry mould component made from the granules

摘要

Resins for use in making resin-coated granules are made by preparing a novolak resin from a phenol and formaldehyde in the presence of lactose and_/or galactose, using an acid catalyst. Melt-coating the resin with an amine curing agent on to particulate refractory material gives resin-coated granules which can be moulded to make foundry moulds.;The lactose and or galactose can replace part of the phenol conventionally employed in preparing novolak resins and avoid the need for plasticisers.