High temperature resistance precoated sand
A technology of coated sand and high temperature resistance, which is applied in the field of foundry sand. It can solve the problems of poor heat resistance, easy sand sticking on castings, and large roughness, and achieve good heat resistance, small roughness, and reduced nitrogen pores. Effect
Inactive Publication Date: 2013-08-07
FANCHANG COUNTY HENGXIN AUTO PARTS
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The invention discloses high temperature resistance precoated sand, which comprises base sand, a binder, hexamethylenetetramine, a phenol formaldehyde resin, a silane coupling agent and an additive A, wherein the base sand comprises, by weight, 55-60 parts of iron ore sand, 60-70 parts of forsterite sand, and 7-10 parts of diatomite, a particle size of the base sand is 100-150 mesh, 3-5 parts by weight of boric acid, 1-2 parts by weight of water-soluble polymer glue powder, 3-5 parts by weight of starch, 0.5-0.8 part by weight of rosin, 4-5 parts by weight of dextrin and 4-6 parts by weight of water are subjected to a reaction and drying to obtain the binder, 4-6 parts by weight of a straw powder material, 2-4 parts by weight of sepiolite and 5-8 parts by weight of water are subjected to a mixing calcination treatment to obtain the additive A, a particle size of the straw powder material is 0.5-0.8 mm, and the obtained calcined product, 2-4 parts by weight of montmorillonite powder and 3-4 parts by weight of water glass are subjected to mixing granulation. The high temperature resistance precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, high temperature resistance is provided, and sand sticking on a cast is not easily generated.
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Property | Measurement | Unit |
Granularity | 100.0 ~ 150.0 | mesh |
Granularity | 0.5 ~ 0.8 | mm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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