Phenolic resin coated core sand for car part casting and preparing method thereof

Abstract

The invention discloses a phenolic resin coated core sand for a car part casting and a preparing method thereof. The core sand is prepared by a raw material including, by weight part, 130 to 150 partsof silica sand, 20 to 30 parts of pulverized corundum, 20 to 24 parts of lead zinc ore tailings, 15 to 19 parts of amblygonite, 10 to 14 parts of water quenching nickel slag, 3 to 5 parts of phenolicresin, 0.5 to 0.7 part of urotropin, 1 to 2 parts of octadecanamide, 2 to 4 parts of aluminum hydroxy distearate, 0.2 to 0.4 part of carboxyl-terminated liquid polybutadiene rubber and the like. Theadded carboxyl-terminated liquid polybutadiene rubber and coal tar can react with free phenol, a product is intermediate state matter with certain chemical reactivity, the strength and high temperature resistance of the coated sand can be improved, the content of phenol in the core sand can be reduced, generation of smoke can be reduced, due to added porous calcium silicate, petroleum coke residue, amblygonite and the like, the mechanical property of the core sand can be improved, the melting point of the coated sand can be increased, a scattering agent configured by added methylphenol and thelike can improve the scattering property and the like of the core sand, and the property of the core sand can be improved.

Description

technical field [0001] The invention belongs to the field of foundry industry, and in particular relates to a phenolic resin-coated core sand for casting automobile parts and a preparation method thereof. Background technique [0002] Coated sand is a molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to make it melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand, which is used for steel castings , Iron castings. At present, some main parts of automobiles are cast with coated sand, but due to the p...

AI Technical Summary

Problems solved by technology

At present, some main parts of automobiles are cast with coated sand, but due to the poor high temperature resistance of coated sand and high curing temperature, especially the added phenolic resin will produce free phenol during casting, causing pollution. And it will volatilize when heated, producing smoke, endangering the health of workers