Furan resin for sand mold 3D printing and preparation method thereof

The invention provides furan resin for sand mold 3D printing and a preparation method thereof, and is characterized in that the furan resin has high purity and low conductivity, the granularity D99 of insoluble substances in the resin is less than or equal to 0.45 mu m, and the conductivity of the resin is less than or equal to 10 mu s/cm. The furan resin for sand mold 3D printing is prepared from the following components in parts by weight: 600 to 800 parts of furfuryl alcohol, 30 to 60 parts of 2-imidazolidone, 20 to 40 parts of paraformaldehyde, 100 to 200 parts of resorcinol, 20 to 50 parts of isopropanol, 1 to 5 parts of sodium hydroxide, 0.5 to 2.5 parts of copper chloride and 3 to 5 parts of gamma-aminopropyltriethoxysilane. The furan resin not only meets the requirements of 3D printing equipment on physical and chemical property indexes of a binder, but also meets the production and application requirements in the aspects of casting process properties such as bonding strength, curing speed, sand mold