Organic ester sodium silicate self-hardening sand and preparation method thereof

Abstract

The invention discloses organic ester sodium silicate self-hardening sand and a preparation method thereof. The organic ester sodium silicate self-hardening sand is prepared from the following raw materials in parts by weight: 65-85 parts of forsterite sand, 20-30 parts of iron ore sand, 3-5 parts of modified sodium silicate, 0.2-0.3 parts of diglycol acetate, 0.1-0.2 parts of fungacetin, 5-10 parts of slag, 4-8 parts of dicalcium silicate, 3-6 parts of medical stone, 2-4 parts of sawdust, 1.5-2.5 parts of polyethylene glycol, 2-3 parts of dioctyl maleate and 0.5-1.5 parts of sodium laurylsulfate. Compared with traditional CO2 blowing hardened sodium silicate sand, the organic ester sodium silicate self-hardening sand has the advantages that the amount of sodium silicate is reduced, and the water wave scattering property and used sand recycling property are greatly improved. Moreover, the liquidity of the molding sand is improved, the molding sand is easily compacted, the strength of the hardened sand is high, the refractoriness of the molding sand is improved, and the surface quality of a casting is obviously improved.

Description

technical field [0001] The invention relates to an organic ester sodium silicate self-hardening sand and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Sodium silicate sand has the advantages of low cost, less cracks in castings, and less environmental pollution. It has become one of the fastest-growing types of molding sand in recent decades. However, the ordinary blown CO 2 Due to the incomplete hardening and low strength of the air hardening water glass sand process, more water glass needs to be added, which in turn results in high final strength and poor collapsibility, which brings difficulties to crushing and regeneration, and old sand cannot be reused. At the same time, if the amount of water glass added is too high, it is easy to stick sand, and the surface quality of castings is difficult to meet the requirements of users. Contents of the invention [0003] The object of the present invention is to a...

AI Technical Summary

Problems solved by technology

However, the ordinary blown CO 2 Due to the incomplete hardening and low strength of the air-hardening water glass sand process, more water glass needs to be added, which in turn results in high final strength and poor collapsibility, which makes it difficult to crush and regenerate, and the old sand cannot be reused.

At the same time, if the amount of water glass added is too high, it is easy to stick sand, and the surface quality of castings is difficult to meet the requirements of users.