Cold-core-box-method epoxy resin single-component binder, cast mixture and cast molding body

Abstract

The invention discloses a cold-core-box-method epoxy resin single-component binder which is used for sulfur dioxide blowing solidification in the absence of an organic peroxide activating agent. The binder comprises by weight (a) 1 part to 40 parts of benzyl ether phenolic resin, (b) 0.1 part to 10 parts of polyisocyanate, (c) 40-77 parts of epoxy resin, (d) 10-30 parts of acrylate and (e) 1 part to 30 parts of high-boiling-point ester and/or hydrocarbon diluent. The weight-average molecular weight of the benzyl ether phenolic resin is between 500 and 2000. The binder overcomes the shortcoming in the prior art that the binder for sulfur dioxide blowing solidification is poor in fragility and humidity resistance, improves strength of sand cores and sand types in the casing process, simultaneously reduces viscosity, and is favorable for the casting process.

Description

Technical field [0001] The invention relates to a binder. The binder is used for casting resin sand mixture, blowing gaseous sulfur dioxide to solidify, forming a core mold for manufacturing cast metal castings, and is suitable for various types of cast steel, cast iron and non-ferrous alloy parts in the field of casting . Background technique [0002] In the foundry industry, the cold box method refers to a process that uses gas or aerosol catalysts to catalyze resin sand at room temperature to achieve rapid curing. According to different gas or aerosol catalysts, the cold box method can be divided into amine method, SO2 method, CO2 resin method and methyl formate method. [0003] The French SPAIC company invented the SO2-furan resin method in 1971, called the Hardox method, and used it in casting production in 1975. The technological process is: adding peroxide-containing activator to the core sand, when SO2 passes through the core sand, it combines with the new ecological oxyg...

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Problems solved by technology

When used in steel castings, the low thermal strength is likely to produce sand

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