Special coated sand for stainless steel and preparation process thereof

Abstract

The invention discloses special coated sand for stainless steel and a preparation process thereof, and particularly relates to the field of coated sand. The special coated sand comprises the followingraw materials: crude sands, zircon sands, ceramsite sands, kaolin, high-strength high-temperature-resistant phenolic resin, urotropine, calcium stearate, a high-temperature-resistant additive and a hardening accelerator. The preparation process comprises the following steps: carrying out weighing, mixing and heating the crude sands, heating the mixed sands, adding the high-strength high-temperature-resistant phenolic resin, the urotropin and the calcium stearate, adding the high-temperature-resistant additive and hardening accelerator, and carrying out cooling, crushing, screening, detecting, packaging and warehousing. The special performance of the coated sand can be improved; the high-temperature resistance of the coated sand can be improved; the quality of the coated sand can be effectively improved; the high-temperature resistance of the coated sand is improved; the high-temperature resistance of the coated sand can be effectively improved, and furthermore, the refractoriness ofthe coated sand can be improved; the surface of a casting is smooth and clean, so that sand sticking to the surface of the stainless steel casting can be effectively avoided; and the coated sand can be completely suitable for production of the stainless steel casting, and the finished product percent of pass is high.

Description

technical field [0001] The invention relates to the technical field of coated sand, more specifically, the invention relates to a special coated sand for stainless steel and a preparation process thereof. Background technique [0002] Coated sand is the molding sand or core sand whose surface is covered with a solid resin film before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. For steel castings and iron castings. [0003] Traditional coated sand has low refractoriness and is limited to low-temperature industries such as cast iron and non-fe...

AI Technical Summary

Problems solved by technology

[0003] Traditional coated sand has low refractoriness and is limited to low-temperature industries such as cast iron and non-ferrous metals. In stainless steel and other high-temperature cast steel industries, due to the serious sand sticking on the surface of castings, the rejection rate of castings is very high, and it has not been widely used. application