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Heatproof precoated sand and preparation method thereof

A film-coated sand, heat-resistant technology, applied in the field of foundry industry, can solve problems such as poor fluidity and sticky sand, and achieve the effects of simple preparation method, increased fluidity and low cost

Active Publication Date: 2014-10-08
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention has high strength and high temperature resistance, it has poor fluidity and is easy to stick sand on castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this embodiment, a heat-resistant coated sand, the weight percentages of each raw material are respectively: the weight percentages of each raw material are respectively: modified phenolic resin 6%, magnesium stearate 1%, urotropine 1.5%, 4% bentonite, 1.5% silicon carbide, 4% silicone oil and 82% silica sand; the modified phenolic resin is obtained through the following steps: formaldehyde is mixed with 20% formaldehyde aqueous solution, and the pH is adjusted to 10 with sodium hydroxide, adding two Chromium boride, react at 60°C for 4h, finally add phenol, react at 110°C for 3h.

[0017] Among them, the content of silicon dioxide in silica sand is 98%, and the particle size of silica sand is 150 mesh.

[0018] The preparation method of a kind of heat-resistant coated sand is that urotropine is formulated into 30% urotropine aqueous solution, the silica sand is heated to 120°C under stirring, and modified phenolic resin, bentonite, carbonization Silicone and silico...

Embodiment 2

[0020] In this example, a kind of heat-resistant coated sand, the weight percentage of each raw material is respectively: modified phenolic resin 4%, magnesium stearate 2%, urotropine 1%, bentonite 3%, silicon carbide 2% , silicone oil 3% and silica sand 85%; the modified phenolic resin is obtained through the following steps: formaldehyde is formulated into 10% formaldehyde solution, the pH is adjusted to 9 with sodium hydroxide, chromium diboride is added, and the Under the condition of reaction for 5h, finally add phenol, and react for 5h under the condition of 90°C.

[0021] In the heat-resistant coated sand, the content of silicon dioxide in the silica sand is 97%, and the particle size of the silica sand is 150 mesh.

[0022] The preparation method of a kind of heat-resistant coated sand is that urotropine is formulated into 30% urotropine aqueous solution, the silica sand is heated to 140°C under stirring, and modified phenolic resin, bentonite, carbonization Silicone ...

Embodiment 3

[0024] In this example, a kind of heat-resistant coated sand, the weight percentage of each raw material is respectively: modified phenolic resin 8%, magnesium stearate 1%, urotropine 2%, bentonite 4%, silicon carbide 1% , 5% silicone oil and 79% silica sand; the modified phenolic resin is obtained through the following steps: formaldehyde is formulated into 18% formaldehyde aqueous solution, the pH is adjusted to 10 with sodium hydroxide, chromium diboride is added, and the Under the condition of reaction for 5h, finally add phenol, and react for 5h under the condition of 100°C.

[0025] Among them, the content of silicon dioxide in the silica sand is 95%, and the particle size of the silica sand is 150 mesh.

[0026] The preparation method of a kind of heat-resistant coated sand is that urotropine is formulated into 30% urotropine aqueous solution, the silica sand is heated to 140°C under stirring, and modified phenolic resin, bentonite, carbonization Silicone and silicone ...

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Abstract

The invention discloses heatproof precoated sand and a preparation method thereof. The heatproof precoated sand is composed of modified phenolic resin, magnesium stearate, urotropine, bentonite, silicon carbide, silicon oil and silica sand. The preparation method is as follows: preparing an urotropine water solution, heating the silica sand to 120 to 140 DEG C under the condition of stirring, adding the modified phenolic resin, bentonite, silicon carbide and silicon oil, stirring for 30 60min, stopping heating, while adding the magnesium stearate and the urotropine water solution, mixing evenly, after cooling to room temperature, crushing and sieving to obtain the heatproof precoated sand. The heatproof precoated sand is reasonable in formula, heat resistance and wear resistance of the heatproof precoated sand are improved, the mobility of the heatproof precoated sand is increased, the heatproof precoated sand is low in cost, and simple in preparation method, the magnesium stearate and the silicon oil are added separately for mixing, so that the mobility of the heatproof precoated sand is ensured.

Description

technical field [0001] The invention relates to heat-resistant coated sand and a preparation method thereof, belonging to the technical field of foundry industry. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a layer of solid resin on the surface of the sand before molding. It is widely used in foundry fields such as iron castings. [0003] The application number is 201310068698.6 "Coated Sand for Heat-resistant Stainless Steel Castings" discloses a formula of coated sand, including 80-85 parts of raw sand, 1.5-2.5 parts of phenolic resin, 15-20 parts of pearl sand, 12-16 parts Lubricants, 4-6 parts of disintegrating agents and urotropine. Although this invention has high strength and high temperature resistance, it has poor fluidity and is easy to stick sand on castings. Contents of the invention [0004] The object of the present invention is to provide a heat-resistant coated sand and a preparation method there...

Claims

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Application Information

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IPC IPC(8): B22C1/00
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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