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A high temperature resistant coated sand

A technology of coated sand and high temperature resistance, applied in the field of coated sand, can solve the problems of easy generation of pores in castings, low heat resistance of coated sand, etc. Effect

Active Publication Date: 2021-03-09
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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  • A high temperature resistant coated sand
  • A high temperature resistant coated sand
  • A high temperature resistant coated 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 coated sand, in particular to a high temperature resistant coated sand. Aiming at the technical problem of poor heat resistance of the existing coated sand, the present invention provides a kind of high temperature resistant coated sand, which is prepared from the following raw materials in parts by weight: 1000 parts of raw sand, 20-30 parts of phenolic resin, cured 10-14 parts of lubricant, 1-1.5 parts of lubricant, 4-6 parts of auxiliary agent; the auxiliary agent is made by mixing borax fine powder, aluminum oxide fine powder and silicon dioxide fine powder. The high-temperature-resistant coated sand of the present invention is made by adding borax, aluminum oxide, and silicon dioxide as an auxiliary agent, and the auxiliary agent undergoes a ceramic reaction during high-temperature casting, which improves the strength and high-temperature resistance of the coated sand. . By adding borax, the ceramicization reaction temperature is lowered to 750-850°C, and the ceramicization reaction can occur at the moment of molten steel casting. The strength and high temperature resistance of membrane sand.

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 Patents(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