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High-temperature-resistant precoated sand

A technology of coated sand and high temperature resistance, which is applied in the field of coated sand, can solve the problems of low heat resistance of coated sand and easy generation of pores in castings, and achieve the goal of improving strength and high temperature resistance, improving strength and high temperature resistance Effect

Active Publication Date: 2019-11-08
柳晶(溧阳)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coated sand obtained by this scheme still has problems such as low heat resistance and prone to pore defects in castings in practical applications.

Method used

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  • High-temperature-resistant precoated sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A high-temperature-resistant coated sand is prepared from the following raw materials in parts by weight: 100 kg of raw sand, 2.5 kg of phenolic resin, 1 kg of urotropine, 0.15 kg of calcium stearate, and 0.6 kg of auxiliary agent; wherein, the auxiliary agent consists of It is prepared by mixing 15 wt% of borax fine powder, 45 wt% of aluminum oxide fine powder and 40 wt% of silicon dioxide fine powder.

[0049] The high-temperature-resistant coated sand of this embodiment is prepared by the following method: (1) Preheat the raw sand and add it to the sand mixer; (2) Add phenolic resin to the raw sand and mix it. After the phenolic resin is melted and fully coated, Add auxiliary agent and mix; (3) Add urotropine aqueous solution and mix until the water volatilizes completely; (4) Add calcium stearate and mix, then cool, sieve, test and pack to obtain coated sand.

[0050] Specifically, the raw sand preheating temperature in step (1) is 140°C.

[0051] Specifically, the s...

Embodiment 2

[0054] A high-temperature-resistant coated sand is prepared from the following raw materials in parts by weight: 100 kg of raw sand, 2 kg of phenolic resin, 1.2 kg of urotropine, 0.1 kg of calcium stearate, and 0.5 kg of auxiliary agent; wherein, the auxiliary agent consists of It is prepared by mixing 10 wt% of borax fine powder, 40 wt% of aluminum oxide fine powder and 50 wt% of silicon dioxide fine powder.

[0055] The high-temperature-resistant coated sand of this embodiment is prepared by the following method: (1) Preheat the raw sand and add it to the sand mixer; (2) Add phenolic resin to the raw sand and mix it. After the phenolic resin is melted and fully coated, Add auxiliary agent and mix; (3) Add urotropine aqueous solution and mix until the water volatilizes completely; (4) Add calcium stearate and mix, then cool, sieve, test and pack to obtain coated sand.

[0056] Specifically, the raw sand preheating temperature in step (1) is 150°C.

[0057] Specifically, the ...

Embodiment 3

[0060] A high-temperature-resistant coated sand, prepared from the following raw materials in parts by weight: 100kg of raw sand, 3.0kg of phenolic resin, 1.4kg of urotropine, 0.15kg of calcium stearate, and 0.4kg of auxiliary agents; It is prepared by mixing 20 wt% of borax fine powder, 30 wt% of aluminum oxide fine powder and 50 wt% of silicon dioxide fine powder.

[0061] The high-temperature-resistant coated sand of this embodiment is prepared by the following method: (1) Preheat the raw sand and add it to the sand mixer; (2) Add phenolic resin to the raw sand and mix it. After the phenolic resin is melted and fully coated, Add auxiliary agent and mix; (3) Add urotropine aqueous solution and mix until the water volatilizes completely; (4) Add calcium stearate and mix, then cool, sieve, test and pack to obtain coated sand.

[0062] Specifically, the raw sand preheating temperature in step (1) is 140°C.

[0063] Specifically, the speed of the sand mixer is 80r / min.

[0064...

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Abstract

The invention relates to the field of precoated sand, in particular to a high-temperature-resistant precoated sand. The invention provides the high-temperature-resistant precoated sand for the technical problem that existing precoated sand is poor in heat resistance. The high-temperature-resistant precoated sand is prepared from the following raw materials of, in parts by weight, 1000 parts of rawsand, 20 - 30 parts of phenolic resin, 10 - 14 parts of a curing agent, 1 - 1.5 parts of a lubricant and 4 - 6 parts of an auxiliary agent, wherein the auxiliary agent is formed by mixing borax finepowder, aluminum oxide fine powder and silicon dioxide fine powder. According to the high-temperature-resistant precoated sand, the auxiliary agent formed by mixing the borax fine powder, the aluminumoxide fine powder and the silicon dioxide fine powder is added, the auxiliary agent is subjected to ceramic reaction during high-temperature pouring, so that the strength and the high-temperature resistance of the precoated sand are improved; and the temperature of the ceramic reaction of the auxiliary agent is reduced to 750 - 850 DEG C by adding the borax, the ceramic reaction can occur instantly at the moment of pouring molten steel, auxiliary agents which are uniformly distributed in the precoated sand form a high-temperature-resistant block ceramic structure, so that the strength and thehigh-temperature resistance of the precoated sand are improved.

Description

technical field [0001] The invention relates to the field of coated sand, in particular to a high temperature resistant coated sand. 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. Iron castings, non-ferrous metal castings, 3D printing and other casting fields are increasingly widely used. However, the current coated sand has poor heat resistance and is prone to cracking when casting castings with complex structures. [0003] The Chinese invention patent with the publication number CN104772426A discloses a high-temperature-resistant coated sand, including raw sand, binder, curing agent, coupling agent, lubricant and refractory particles, and limits the types of raw materials and the relationship between them. The proportion relationship, by adding refractory particles, the overall refractory durability and structural stability of the coated sand are impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/22
CPCB22C1/02B22C1/2253
Inventor 吴武灿任文虎王古月
Owner 柳晶(溧阳)环保科技有限公司