Sand sticking-resistant precoated sand

A technology of coated sand and anti-sticking sand, applied in the field of foundry sand, which can solve the problems of poor heat resistance, large roughness, and easy sand sticking on castings, etc., and achieve good heat resistance, small roughness, and improved air permeability Effect

Inactive Publication Date: 2013-09-04
FANCHANG COUNTY HENGXIN AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of poor heat resistance, large roughness, and easy sand sticking on castings in the prior a

Method used

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Embodiment Construction

[0014] Anti-sticking sand-coated sand, comprising former sand, binding agent, urotropine, calcium stearate, silane coupling agent and additive A, in parts by weight, described former sand is composed of 82 parts of river sand, 18 Part of graphite powder, 4 parts of lignin, 5 parts of asphalt, and 25 parts of loess-coated particles are mixed. The loess-coated particles are mixed with 23 parts of loess, 4 parts of sodium dihydrogen phosphate and an appropriate amount of water. Obtained after calcining and crushing, the particle size of the loess-coated particles is 0.4mm; the adhesive comprises 8 parts of phenolic resin, 4 parts of high alumina clinker, 5 parts of boric acid, 4 parts of polypropylene chopped fiber, 3 parts of 12 parts of syrup mixed with 12 parts of 40-45% phosphate solution; the additive A is obtained by mixing 4 parts of oil sludge, 4 parts of lime powder, 5 parts of dextrin, 0.4 parts of potassium feldspar powder, and 9 parts of water for 300- Calcined at 350...

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Abstract

The invention discloses sand sticking-resistant precoated sand. The sand sticking-resistant precoated sand comprises raw sand, a binder, urotropine, calcium stearate, a silane coupling agent and an additive A. The raw sand comprises, by weight, 76 to 90 parts of river sand, 16 to 20 parts of graphite powder, 3 to 5 parts of lignin, 4 to 6 parts of asphalt and 20 to 25 parts of loess coated particles. The loess coated particles are prepared by mixing 20 to 26 weight parts of loess, 2 to 5 weight parts of sodium dihydrogen phosphate and an appropriate amount of water into block mass and carrying out calcinations and crushing. The loess coated particles have the particle sizes of 0.3 to 0.6mm. The sand sticking-resistant precoated sand has good anti-wettability, low roughness and high temperature resistance and is not sticked to a casing easily.

Description

technical field [0001] The invention relates to a casting sand, in particular to an anti-sticking sand-coated sand, which is particularly suitable for making casting sand molds. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. There are two kinds of 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 grains, 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. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B22C1/16
Inventor 周道虎
Owner FANCHANG COUNTY HENGXIN AUTO PARTS
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