초록 ▼

A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic n

A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin. The resin may be a novolac type, a resole type or a mixture of the two types of phenolic resins. Suggested aromatic nitro compounds are nitrophenols, dinitrophenols and nitronaphthalenes. The process is extremely useful for coating lower melting temperature metals such as aluminum and magnesium.

대표청구항 ▼

A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom, comprising foundry aggregates coated with a phenolic resin containing an aromatic nitro compound, wherein the incorporating range of aromatic nitro compounds to 100 parts by

A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom, comprising foundry aggregates coated with a phenolic resin containing an aromatic nitro compound, wherein the incorporating range of aromatic nitro compounds to 100 parts by weight phenolic is from about 0.2 to about 40 parts by weight.