Phenolic resin coated core sand for automobile part and preparation method thereof

Abstract

The invention discloses a phenolic resin coated core sand for an automobile part and a preparation method thereof. The phenolic resin coated core is prepared from the following raw materials in parts by weight: 130 to 150 parts of silica sand, 20 to 30 parts of emery, 20 to 24 parts of lead-zinc tailing ore, 15 to 19 parts of amblygonite, 10 to 14 parts of water-quenching nickel slag, 3 to 5 parts of phenolic resin, 0.5 to 0.7 part of urotropin, 1 to 2 parts of octadecanamide, 2 to 4 parts of aluminium hydroxy distearate, 0.2 to 0.4 part of carboxyl terminated liquid polybutadiene rubber, and the like. The phenolic resin coated core has the advantages that the added carboxyl terminated liquid polybutadiene rubber and coal tar can react with free phenol, the generated matter is an intermediate matter with certain chemical reaction activity, the strength and high temperature-resistant property of coated sand are improved, the content of phenol in core sand is reduced, and the generation of smoke is reduced; by adding porous calcium silicate, petroleum tar slag, amblygonite and the like, the mechanical property of sand core is improved, and the melting point of coated sand is increased; by adding a breakdown agent which is prepared by p-cresol and the like, the breakdown property of core sand is improved, and the property of sand core is improved.

Description

field of invention [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 th...

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

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