3D printing precoated sand and preparation method thereof
A technology of 3D printing and coated sand, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of high chemical composition of coated sand formula, no specific disclosure of curing speed, long curing time of coated sand, etc. , to achieve the effect of ensuring the final dimensional accuracy and mechanical properties, shortening the preparation time and shortening the mixing time
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Embodiment 1
[0025] A 3D printing coated sand, comprising the following raw material components in parts by weight: 80 parts of silica sand, 50 parts of graphite powder, 10 parts of lignin, 1.2 parts of sodium hexametaphosphate, 3 parts of pyrethroid compounds, and 3 parts of nitrile rubber 3 parts of maltose, 10 parts of silica sol, and 20 parts of phenolic resin.
[0026] The preparation method of the 3D printing coated sand of the present embodiment mainly includes the following steps:
[0027] (1) Binder preparation: First, melt the NBR according to the raw material components at 130°C, then pour the maltose into the melted NBR according to the raw material components, and mix it with the NBR after the maltose is melted. Pour them into a blender together, and the stirring time is 8 minutes; then pour the pyrethroid compound into the blender according to the raw material components and continue stirring, the stirring time is 6 minutes, and form a binder after it is stirred evenly;
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Embodiment 2
[0033] A 3D printing coated sand, comprising the following raw material components in parts by weight: 85 parts of silica sand, 55 parts of graphite powder, 13 parts of lignin, 1.4 parts of sodium hexametaphosphate, 4 parts of pyrethroid compounds, and 4 parts of nitrile rubber 4 parts of maltose, 15 parts of silica sol, and 23 parts of phenolic resin.
[0034] The preparation method of the 3D printing coated sand of the present embodiment mainly includes the following steps:
[0035] (1) Binder preparation: First, melt the NBR according to the raw material components at 145°C, then pour the maltose into the melted NBR according to the raw material components, and mix it with the NBR after the maltose is melted. Pour them into the blender together, and the stirring time is 9 minutes; then pour the pyrethroid compound into the blender according to the raw material components and continue stirring, the stirring time is 7 minutes, and form a binder after it is stirred evenly;
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Embodiment 3
[0041] A 3D printing coated sand, comprising the following raw material components in parts by weight: 90 parts of silica sand, 60 parts of graphite powder, 15 parts of lignin, 1.6 parts of sodium hexametaphosphate, 5 parts of pyrethroid compounds, and 5 parts of nitrile rubber 5 parts of maltose, 20 parts of silica sol, and 25 parts of phenolic resin.
[0042] The preparation method of the 3D printing coated sand of the present embodiment mainly includes the following steps:
[0043] (1) Binder preparation: First, melt the NBR according to the raw material components at 160°C, then pour the maltose into the melted NBR according to the raw material components, and mix it with the NBR after the maltose is melted. Pour them into the blender together, and the stirring time is 10 minutes; then pour the pyrethroid compound into the blender according to the raw material components and continue stirring, the stirring time is 8 minutes, and form a binder after it is stirred evenly;
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