Precoated sand with high-temperature resistance and good compactness and preparation method thereof
A compact and high-temperature-resistant technology, applied in the field of coated sand and its preparation, can solve the problems of sticky sand, large roughness, poor heat resistance, etc., and achieve the effects of not easy to stick sand, good compactness, and not easy to crack and deform
Inactive Publication Date: 2015-08-26
MAANSHAN HENGYI MACHINERY MFG
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Problems solved by technology
The coated sand in the prior art has the defects and problems of poor heat resistance, large roughness, and easy sand sticking on the casting
Method used
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Embodiment Construction
[0014] The present invention will be described in detail below through specific examples.
[0015] A coated sand with good high temperature resistance and compactness is made of the following raw materials in parts by weight (kg): quartz sand 75, refractory soil 7, yellow sand 10, thermoplastic phenolic resin 4, urotropine 0.8, boric acid 1, Iron oxide red 0.2, calcium stearate 0.2, water 2.5, polyurethane adhesive 1, synergist 5;
[0016] The synergist is prepared from the following raw materials in parts by weight (kg): 4 corn stalks, 2 starch, 3 water glass, 1.5 calcium hydroxide, 1 magnesium chloride, 4 graphene, 20 clay, 9 zircon powder, and Dibutyl phthalate 3, water 9; the preparation method is as follows: dry the corn stalks and crush them into 100-mesh powder, mix them with pottery clay and starch, mix them evenly, add water and stir them evenly, control the temperature at 60°C-80°C, and keep it for 1 hour , then add the remaining ingredients except water glass and d...
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The invention discloses precoated sand with high-temperature resistance and good compactness. The precoated sand is characterized by being prepared by the following raw materials in parts by weight: 75-86 parts of quartz sand, 7-9 parts of fire clay, 10-12 parts of yellow sand, 4-6 parts of thermoplastic phenolic resins, 0.8-1 part of urotropin, 1-1.5 parts of boric acid, 0.2-0.3 part of iron oxide red, 0.2-0.3 part of calcium stearate, 2.5-3 parts of water, 1-2 parts of polyurethane adhesive, and 5-7 parts of synergist. The precoated sand is prepared by a hot method; the social need is satisfied through modifying a formula; the synergist prepared by a special process is added; the fluidity, the air permeability, the cooling capacity and the strength of the precoated sand are enhanced; the precoated sand is compact in surface, and is not liable to be cracked and deformed; such components as boric acid and fire clay for raising the heat resisting temperature and polyurethane adhesive for improving the sand adhesiveness are additionally added; and the prepared precoated sand has the advantages of high-temperature resistance, good compactness, difficult sand bonding, low cost, good quality and high production efficiency.
Description
technical field [0001] The invention relates to the technical field of molding sand, in particular to coated sand with good high temperature resistance and compactness and a preparation method thereof. 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. In recent years, the production process of thermal coated sand has been widely used, that is, preheat the sand to a certain temperature, add resin to melt it, 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. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface and easy storage, coated sand has been widely used in recent years. The coated sand in the prior art has the defects and problems of poor heat resistance, large roughness, and easy sand ...
Claims
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Inventor 章功国王泾文段宗银李纯金陈超王淑妍张少伍王晓芬谢勇
Owner MAANSHAN HENGYI MACHINERY MFG