Resin sand

Abstract

The invention disclose resin sand, which comprises resin and mixed sand consisting of new sand and old sand, wherein the old sand accounts for 80-85 percent by mass of the total mass of the mixed sand; the new sand accounts for 15-20 percent by mass of the total mass of the mixed sand; and the adding amount of the resin is 1.60-1.63 percent by mass based on the total mass of the resin sand. Due to the adoption of a reasonable new sand and old sand proportion scheme, and the adding amount range of the resin is reselected specific to the proportion scheme, so that the using requirement of the resin sand mold is met, and the sand falling of a sand shaking machine is easy, and the old sand is convenient to recycle.

Description

Technical field [0001] The invention relates to molding sand for casting, in particular to a resin sand. Background technique [0002] Resin sand is used for removing flash from electronic products, thermosetting plastic products and rubber products, cleaning molds, sensitive components and gold-plated parts, and can be used as paint removers, adhesives, reinforcing agents, waterproofing agents, flame retardants, etc., It is widely used in various fields such as building decoration industry, transportation industry, advertising industry, agriculture, electronic appliances, casting industry and so on. [0003] In resin sand casting, the amount of resin added to the existing national standards is 1.2%-1.8% of the quality of the sand. Generally, the final compressive strength in the industry is ≥2.0MPa. At present, most of the molding sand used by enterprises is a mixture of new sand and old sand. However, the range of resin addition in the national standard is only for new sand, an...

AI Technical Summary

Problems solved by technology

At present, the molding sand used by enterprises is mostly a mixture of new sand and old sand, but the range of resin addition in the national standard is only for new sand, and the range is relatively large. There are certain problems in the actual use of this resin sand, such as Shaking sand machine is difficult to shake out, etc.