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A kind of shell-resistant coated sand and preparation method thereof

A technology of coated sand and quartz sand, applied in the field of coated sand, can solve the problems of shelling and core penetration, and achieve the effect of eliminating shelling, reducing the tendency of shelling, and reducing core penetration defects.

Active Publication Date: 2016-08-17
CHENGDE BEIYAN CASTING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also shortcomings. The shell core coated sand is prone to shelling defects in the process of making shell core sand cores, and defects such as core penetration are prone to occur in the pouring process. Therefore, the performance of the existing coated sand must be improved so that It satisfies production needs

Method used

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  • A kind of shell-resistant coated sand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put the raw sand composed of 70% quartz sand and 30% phase-change quartz sand according to the mass into the sand mixer, heat it to 120°C, add a coupling agent accounting for 0.1% of the binder mass, and carry out the first 5s Mix it once. Next, add a binder accounting for 1% of the mass of the original sand, and carry out the second mixing and grinding for 25 seconds. Then, add 0.1% additive and 3% curing agent accounting for the mass of the binder, and carry out the third mixing and grinding for 45s. Finally, after adding 1% lubricant to the mass of the binder and stirring evenly, the temperature was lowered to 60°C, crushed and sieved to obtain coated sand.

Embodiment 2

[0022] Put the raw sand composed of 90% quartz sand and 10% phase-change quartz sand according to the mass into the sand mixer, heat it to 130°C, add a coupling agent accounting for 0.5% of the binder mass, and carry out the first 10s Mix it once. Next, add a binder accounting for 4% of the mass of the original sand, and carry out the second mixing and grinding for 15 seconds. Then, add 1.0% additives and 15% curing agent accounting for the mass of the binder, and carry out the third mixing and grinding for 30 seconds. Finally, after adding 5% of the lubricant in the mass of the binder and stirring evenly, the temperature was lowered to 70°C, crushed and sieved to obtain coated sand.

Embodiment 3

[0024] Put the raw sand composed of 80% quartz sand and 20% phase-change quartz sand according to the mass into the sand mixer, heat it to 140°C, add a coupling agent accounting for 0.3% of the binder mass, and carry out the first 8s Mix it once. Next, add a binder accounting for 2.5% of the mass of the original sand, and carry out the second mixing and grinding for 20 seconds. Then, add 0.6% additives and 10% curing agent accounting for the mass of the binder, and carry out the third mixing and milling for 60s. Finally, after adding 3% lubricant in the mass of the binder and stirring evenly, the temperature was lowered to 80°C, crushed and sieved to obtain coated sand.

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Abstract

The invention discloses a peeling-resistant coated sand and a preparation method thereof. The shell-resistant coated sand is characterized in that it comprises raw sand, a binder accounting for 1 to 4% of the mass of the raw sand, 1 to 15% of a curing agent based on the mass of the binder, and 0.1 to 0.5% of Coupling agent, 0.1-1.0% additive. The additive added in the present invention can increase the curing rate of the curing agent to the binder, increase the hardening rate of the coated sand, and reduce the tendency of shelling. By optimizing the content of each component, the overall strength of the coated sand can be improved, and the gas generation of the coated sand can be greatly reduced, and core penetration defects can be reduced. The coated sand of the present invention has strong anti-shelling ability, high strength and low gas generation. It can significantly reduce or eliminate defects such as shelling and core penetration, effectively improve the quality of the inner and outer surfaces of the shell core, and is suitable for the production of shell core sand cores.

Description

technical field [0001] The invention relates to the technical field of coated sand, in particular to a shell-resistant coated sand 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. 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. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface and easy storage, coated sand is widely used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/22B22C1/02B22C1/10
Inventor 韩冰韩继磊
Owner CHENGDE BEIYAN CASTING MATERIAL
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