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High-temperature resistant coated sand

A technology of high-temperature resistant and coated sand, which is applied in the field of coated sand, can solve the problems of poor heat resistance and poor material coordination, and achieve the effects of strong fire resistance, good retention and improved fire resistance

Active Publication Date: 2011-01-05
陕西弘大众为石油科技有限公司
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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 and poor material coordination in the prior art, and provide a high temperature resistant coated sand with strong heat resistance and good material coordination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high temperature-resistant coated sand, including raw sand, binder, curing agent, coupling agent, lubricant and refractory particles, the amount of curing agent is 30% of the amount of binder, and the amount of coupling agent is viscose The amount of binder is 8% of the amount of the original sand, the amount of the binder is 10% of the amount of the original sand, the amount of the lubricant is 2% of the amount of the original sand, the amount of refractory particles is 20% of the amount of the original sand, the composition of the original sand and The proportions by weight are: 20 green sand, 60 recycled sand, 20 diatomite, and the composition and weight proportions of refractory particles are: 50 quartz sand, 30 green sand, 20 refractory fiber, and 15 graphite powder.

Embodiment 2

[0022] A high-temperature-resistant coated sand, including raw sand, binder, curing agent, coupling agent, lubricant and refractory particles, the amount of curing agent is 50% of the amount of binder, and the amount of coupling agent is viscose The amount of binder is 5% of the amount of the original sand, the amount of the binder is 8% of the amount of the original sand, the amount of the lubricant is 5% of the amount of the original sand, the amount of refractory particles is 10% of the amount of the original sand, the composition of the original sand and The parts by weight ratio are: green sand 40, recycled sand 50, diatomite 10, and the composition and weight ratio of refractory particles are: quartz sand 60, green sand 10, refractory fiber 10, graphite powder 5.

Embodiment 3

[0024] A high-temperature-resistant coated sand, including raw sand, binder, curing agent, coupling agent, lubricant and refractory particles, the amount of curing agent is 40% of the amount of binder, and the amount of coupling agent is viscose The amount of binder is 7% of the amount of the original sand, the amount of the binder is 9% of the amount of the original sand, the amount of the lubricant is 3.5% of the amount of the original sand, the amount of refractory particles is 15% of the amount of the original sand, the composition of the original sand and The weight ratio is: green sand 30, recycled sand 55, diatomite 15, the composition and weight ratio of refractory particles are: quartz sand 55, green sand 20, refractory fiber 15, graphite powder 10.

[0025] It can be seen from the above that the present invention not only has good coordination and strong fire resistance, but also has strong retention, is easy to prepare, and has low manufacturing cost.

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Abstract

The invention discloses high-temperature resistant coated sand, which comprises crude sand, an adhesive, a curing agent, a coupling agent, a lubricant and refractorily particles, wherein the dosage of the curing agent is 30 to 50 percent of that of the adhesive; the dose of the coupling agent is 5 to 8 percent of that of the adhesive; the dose of the adhesive is 8 to 10 percent of that of the crude sand; the dose of the lubricating agent is 2 to 5 percent of that of the crude sand; and the dose of the refractorily particles is 10 to 20 percent of that of the crude sand. The refractorily particles comprise the following components in part by weight: 50 to 60 parts of quartz sand, 10 to 30 parts of sand bitumen, 10 to 20 parts of refractory fibers and 5 to 15 parts of graphite powder; and the crude sand comprises the following components in part by weight: 20 to 40 parts of sand bitumen, 50 to 60 parts of hollow grinding sand, and 10 to 20 parts of kieselguhr. The high-temperature resistant coated sand has high coordinability, high refractability, high retentivity, easy preparation and low manufacturing cost.

Description

technical field [0001] The invention relates to a coated sand, in particular to a high-temperature-resistant coated sand, which is particularly suitable for the production of thin-walled castings with complex structures. 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 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 dimension...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/16B22C1/22
Inventor 浦巧生
Owner 陕西弘大众为石油科技有限公司
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