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Self-heat-absorption precoated sand and preparation method thereof

A technology of coated sand and silica sand, which is applied in the field of casting materials, can solve the problems of scrapping and intrusion of castings, and achieve the effects of improving production efficiency, improving heat resistance, and obvious cost advantages

Active Publication Date: 2021-12-10
HEFEI RENCHUANG CASTING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the binder layer is burnt out before the casting is solidified, discrete sand particles will invade the molten metal, causing the casting to be scrapped

Method used

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  • Self-heat-absorption precoated sand and preparation method thereof
  • Self-heat-absorption precoated sand and preparation method thereof
  • Self-heat-absorption precoated sand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of self-absorbing heat-coated sand of the present embodiment comprises the following raw materials: 96 kg of silica sand, 3 kg of phenolic resin, 0.5 kg of urotropine, 0.3 kg of calcium stearate, 0.096 kg of heat-absorbing auxiliary agent, and flame retardant 0.98kg, the endothermic auxiliary agent is calcium carbonate powder, the particle size is greater than 600 mesh, and the flame retardant is a mixture of ammonium dihydrogen phosphate and diammonium hydrogen phosphate at a mass ratio of 1:1.

[0058] The preparation method of the self-absorbing heat-coated sand of the present embodiment comprises the steps:

[0059] (1) according to the parts by weight of each raw material, take by weighing respectively for subsequent use;

[0060] (2) Slowly heat the silica sand and the endothermic auxiliary agent at a heating rate of 10°C / s to 110°C to obtain a heated mixture;

[0061] (3) Add phenolic resin to the heated mixture and stir evenly, add urotropine and stir ev...

Embodiment 2

[0064] A kind of self-absorbing heat-coated sand of the present embodiment comprises the following raw materials: silica sand 97kg, phenolic resin 2kg, urotropine 0.85kg, calcium stearate 0.175kg, endothermic auxiliary agent 0.538kg, flame retardant The endothermic auxiliary agent is magnesium carbonate powder with a particle size greater than 600 mesh, and the flame retardant is a mixture of ammonium dihydrogen phosphate and diammonium hydrogen phosphate at a mass ratio of 1:2.

[0065] The preparation method of the self-absorbing heat-coated sand of the present embodiment comprises the steps:

[0066] (1) according to the parts by weight of each raw material, take by weighing respectively for subsequent use;

[0067] (2) Slowly heat the silica sand and the endothermic auxiliary agent accounting for 40% of the total mass of the endothermic auxiliary agent at a heating rate of 9°C / s to 135°C to obtain a heated mixture;

[0068] (3) Add phenolic resin to the heated mixture and...

Embodiment 3

[0071] A self-absorbing heat-coated sand of this embodiment is made of the following raw materials: 98 kg of silica sand, 1 kg of phenolic resin, 1.0 kg of urotropine, 0.05 kg of calcium stearate, 0.98 kg of heat-absorbing auxiliary agent, and a flame retardant 0.096kg, the endothermic auxiliary agent is calcium carbonate powder, magnesium carbonate powder and basic zinc carbonate mixed with a mass ratio of 1:1:1, the particle size is greater than 600 mesh, and the flame retardant is ammonium dihydrogen phosphate It is mixed with diammonium hydrogen phosphate according to the mass ratio of 2:1.

[0072] The preparation method of the self-absorbing heat-coated sand of the present embodiment comprises the steps:

[0073] (1) according to the parts by weight of each raw material, take by weighing respectively for subsequent use;

[0074] (2) Slowly heat the silica sand and the endothermic auxiliary agent at a heating rate of 8°C / s to 160°C to obtain a heated mixture;

[0075] (...

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Abstract

The invention relates to self-heat-absorption precoated sand and a preparation method thereof. The self-heat-absorption precoated sand is prepared from the following raw materials in parts by weight: 96-98 parts of silica sand, 1-3 parts of phenolic resin, 0.1-0.6 part of a curing agent, 0.05-0.3 part of a lubricant, 0.096-0.98 part of a heat absorption auxiliary agent and 0.096-0.98 part of a flame retardant. The precoated sand has the advantages that the heat absorption auxiliary agent is added into the precoated sand, heat of high-temperature molten metal during solidification is absorbed through a self-heat-absorption chemical reaction, so that the heat resistance of the precoated sand is improved. Compared with a traditional ferrochrome sand chilling material, the cost advantage is obvious, the working procedures of brushing paint on a sand core and drying are omitted, and the purposes of reducing cost and improving efficiency are achieved; the surface of the precoated sand is coated with the heat absorption auxiliary agent, so that the conventional performance of the precoated sand is not affected; and according to the precoated sand prepared through the method, castings can achieve different effects in different solidification stages, and the special requirement that common silica sand can be used for ultra-large steel castings is met.

Description

technical field [0001] The invention belongs to the technical field of casting materials, and in particular relates to a self-absorbing heat-coated sand and a preparation method thereof. Background technique [0002] With the rapid development of my country's shipbuilding, high-speed rail, and aerospace industries, it is necessary to gradually realize the transformation of high-end parts from imports to localization, which presents opportunities and challenges for domestic foundry companies, and excellent molding materials are key materials for casting production. [0003] The pouring temperature of ferrous metal castings of different materials ranges from 1350-1650°C. The most commonly used molding material for casting is quartz silica sand, but the highest refractoriness is only 1550°C. Because the refractoriness of silica sand itself is not enough, it will cause sticky sand and veins in castings. Defects such as grain, deformation and cracking. Although non-quartz sand (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 尹海军孙贤洋熊东方胡文志王将宝
Owner HEFEI RENCHUANG CASTING MATERIAL CO LTD
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