High temperature resistant precoated sand

A technology of coated sand and high temperature resistance, applied in the field of coated sand, can solve problems such as the inability to meet the requirements of precision casting, and achieve the effects of long heat resistance time and high tensile strength

Inactive Publication Date: 2020-11-06
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 hot and high-temperature coated sand in the prior art cannot meet the requirements of precision casting for high-temperature-resistant coated sand.

Method used

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  • High temperature resistant precoated sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 100kg of silica sand, 2kg of thermoplastic phenolic resin, 0.2kg of carbon fiber, 0.2kg of urotropine, and 0.15kg of calcium hardate, wherein the particle size of the carbon fiber is 270 mesh.

[0026] (1) Heat the silica sand to 150°C and put it into the sand mixer;

[0027] (2) Add phenolic resin into the sand mixer and stir for 40 seconds to completely melt the thermoplastic phenolic resin;

[0028] (3) Add carbon fiber into the sand mixer and stir for 20s to mix the carbon fiber and resin evenly;

[0029] (4) Add curing agent and water into the sand mixer, cool down rapidly, and stir for 40 seconds to completely cure the resin;

[0030] (5) Add lubricant into the sand mixer and stir for 30s to make the coated sand into granules;

[0031] (6) Crushing and screening to obtain high temperature resistant coated sand.

Embodiment 2

[0033] Weigh 100kg of silica sand, 3kg of thermoplastic phenolic resin, 0.3kg of carbon fiber, 0.4kg of urotropine, and 0.2kg of calcium hardate, wherein the particle size of the carbon fiber is 200 mesh.

[0034] (1) Heat the silica sand to 140°C and put it into the sand mixer;

[0035] (2) Add phenolic resin into the sand mixer and stir for 30s to completely melt the thermoplastic phenolic resin;

[0036] (3) Add carbon fiber into the sand mixer and stir for 15 seconds to mix the carbon fiber and resin evenly;

[0037] (4) Add curing agent and water into the sand mixer, cool down rapidly, and stir for 50 seconds to completely cure the phenolic resin;

[0038] (5) Add lubricant into the sand mixer and stir for 40s to make the coated sand into granules;

[0039] (6) Crushing and screening to obtain high temperature resistant coated sand.

Embodiment 3

[0041] Weigh 100kg of silica sand, 2.2kg of thermoplastic phenolic resin, 0.4kg of carbon fiber, 0.5kg of urotropine, and 0.25kg of calcium hardate, wherein the particle size of the carbon fiber is 230 mesh.

[0042] (1) Heat the silica sand to 130°C and put it into the sand mixer;

[0043] (2) Add phenolic resin into the sand mixer and stir for 30s to completely melt the thermoplastic phenolic resin;

[0044] (3) Add carbon fiber into the sand mixer and stir for 15 seconds to mix the carbon fiber and resin evenly;

[0045] (4) Add curing agent and water into the sand mixer, cool down rapidly, and stir for 50s;

[0046] (5) Add lubricant into the sand mixer and stir for 40s to make the coated sand into granules;

[0047] (6) Crushing and screening to obtain high temperature resistant coated sand.

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Abstract

The invention belongs to the technical field of precoated sand, and in particular to high temperature resistant precoated sand. The high temperature resistant precoated sand comprises the raw materials of the following parts by weight: 100 parts of silica sand, phenolic resin accounting for 2-3% of the weight of the silica sand, carbon fiber accounting for 7-14% of the weight of the phenolic resin, a curing agent accounting for 12-20% of the weight of the phenolic resin, and a lubricant accounting for 5-9% of the weight of the phenolic resin. In the high temperature resistant precoated sand, the carbon fiber is added in the preparation process of the precoated sand, the high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and other performances of the carbon fiber are used, and the carbon fiber is limited to be added by 7-14% of the weight of the phenolic resin, so that the prepared precoated sand has high thermal tensile strengthand long time of heat resistance.

Description

technical field [0001] The invention belongs to the technical field of coated sand, and in particular relates to a high-temperature-resistant coated sand. Background technique [0002] Casting is one of the basic industries of machinery manufacturing. The weight of castings directly affects the weight of the mechanical products manufactured by it. Shell mold casting is a kind of precision casting. Coated sand is widely used as molding materials. It has the characteristics of high precision and surface finish, good metallographic structure and mechanical properties, low rejection rate of castings, can cast thin-walled castings, high production efficiency, and a wide range of alloys that can be cast. [0003] With the development of industry and the progress of society, especially the development of the automobile industry, higher requirements are placed on the weight of castings and the development of the foundry industry. In shell mold casting, when a certain tensile streng...

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 胡胜利吴武灿王古月胡金武
Owner 柳晶(溧阳)环保科技有限公司
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