Furan resin self-hardening sand for casting and preparation method thereof

Abstract

The invention discloses furan resin self-hardening sand for casting and a preparation method thereof. The furan resin self-hardening sand is prepared from the following raw materials in parts by weight: 20-30 parts of fresh sand, 70-80 parts of old sand, 1-1.5 parts of self-hardening furan resin, 10-15 parts of phosphoric acid, 8-12 parts of p-toluenesulfonic acid, 5-10 parts of ethyl sulfate, 0.5-1.5 parts of N-2-(amino ethyl group)-3-aminopropyl trimethoxy silane, 4-8 parts of tricresyl phosphate, 3-6 parts of waste syrup, 2-4 parts of activated carbon, 3-5 parts of sepiolite, 4-6 parts of zeolite, 5-10 parts of dibutyl phthalate, 2-3 parts of sodium alginate, 3-5 parts of butyl stearate and 4-6 parts of composite powder. The furan resin self-hardening sand has the advantages of being non-toxic, high in strength, small in smell, low in gas evolution and thermal expansivity, good in gas permeability and collapsibility, proper in viscosity, smooth and clean in surface, easy to clean and the like. The prepared casting is high in degree of precision and good in surface quality. The furan resin self-hardening sand is suitable for casting various cast steels, cast iron and non-ferrous castings.

Description

technical field [0001] The invention relates to a furan resin self-setting sand for casting and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Furan resin self-setting sand is made of furan resin as a binder and mixed with a catalyst. Furan resin self-setting sand can harden itself at room temperature without drying. It has high production efficiency, and the old sand is easy to reuse. With the characteristics of high precision and good surface quality, it has been more and more widely used in China in recent years. However, there are also shortcomings. Furan resin no-bake sand is easy to expand when heated, and has a large amount of gas generation, which is easy to cause defects such as pores, hot cracks, and surface microcracks in castings. Therefore, it is necessary to improve the performance of the existing furan resin self-setting sand to meet the production requirements. Contents of the invention [000...

AI Technical Summary

Problems solved by technology

However, there are also shortcomings. Furan resin self-setting sand is easy to expand when heated, and has a large amount of gas generation, which is easy to cause defects such as pores, hot cracks, and surface microcracks in castings.