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Coated sand with high temperature resistance, low gas generation, low expansion and easy collapse and preparation method thereof

A low-expansion, coated sand technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of reducing gas production, not effectively avoiding veins and sticky sand defects, etc., to prevent Effects of sticking sand and veining, wide application range, excellent low-temperature collapse and high-temperature heat resistance

Active Publication Date: 2020-12-15
HEFEI RENCHUANG CASTING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention improves the heat resistance and collapse of the coated sand, the heat resistance is only a modification of the phenolic resin, which can only improve the high temperature resistance of the resin, and cannot effectively avoid the poor high temperature resistance of the aggregate. The veins and sticky sand defects caused by it, not to mention how to reduce the gas production to prevent pore defects

Method used

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  • Coated sand with high temperature resistance, low gas generation, low expansion and easy collapse and preparation method thereof
  • Coated sand with high temperature resistance, low gas generation, low expansion and easy collapse and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A high-temperature-resistant, low-gassing, low-expansion, and easy-to-collapse coated sand of this embodiment is made of the following raw materials: 10 kg of silica sand, 90 kg of high-alumina ceramsite sand, 0.1 kg of clay, and 0.5 kg of fast-polymerizing phenolic resin , 0.5kg of high-strength phenolic resin, 0.1kg of silane, 0.1kg of acrylic acid, 0.1kg of magnesium oxide, 0.1kg of ferric oxide, 0.2kg of urotropine aqueous solution, and the content of urotropine in urotropine aqueous solution The mass fraction is 40%, calcium stearate 0.1kg.

[0044] Among them, the particle size of the clay is 1250 mesh, the particle size of magnesium oxide is 800 mesh, the softening point of the fast polymerization resin is 100°C, the polymerization speed is 20s, the softening point of the high-strength resin is 85°C, and the polymerization speed is 40s; The preparation method of high alumina ceramsite sand is as follows:

[0045] (1) Grinding and sifting 30 kg of roasting and de...

Embodiment 2

[0054] A high-temperature-resistant, low-gassing, low-expansion, and easy-to-collapse coated sand of this embodiment is made of the following raw materials: 50 kg of silica sand, 60 kg of high-alumina ceramsite sand, 0.15 kg of clay, and 0.75 kg of fast-polymerizing phenolic resin , 0.75kg of high-strength phenolic resin, 0.15kg of silane, 0.15kg of acrylate, 0.15kg of magnesium oxide, 0.15kg of ferric oxide, 0.3kg of urotropine aqueous solution, and the content of urotropine in urotropine aqueous solution The mass fraction is 50%, calcium stearate 0.15kg.

[0055] Among them, the particle size of clay is 1500 mesh, the particle size of magnesium oxide is 1000 mesh, the softening point of fast polymerizing resin is 97°C, the polymerization speed is 25s, the model is NTS30KR, the softening point of high-strength resin is 90°C, and the polymerization speed 40s, model NTS20KR; the preparation method of high alumina ceramsite sand is as follows:

[0056] (1) Grinding and sifting ...

Embodiment 3

[0065] A high-temperature-resistant, low-gassing, low-expansion, and easy-to-collapse coated sand of this embodiment is made of the following raw materials: 90 kg of silica sand, 10 kg of high-alumina ceramsite sand, 0.2 kg of clay, and 1.0 kg of fast-polymerizing phenolic resin , 1.0kg of high-strength phenolic resin, 0.2kg of silane, 0.2kg of acrylate, 0.2kg of magnesium oxide, 0.2kg of ferric oxide, 0.3kg of urotropine aqueous solution, and the content of urotropine in urotropine aqueous solution The mass fraction is 60%, calcium stearate 0.2kg.

[0066] Among them, the particle size of clay is 1800 mesh, the particle size of magnesium oxide is 1800 mesh, the softening point of fast polymerization resin is 100°C, the polymerization speed is 20s, the softening point of high-strength resin is 95°C, and the polymerization speed is 40s; The preparation method of high alumina ceramsite sand is as follows:

[0067] (1) Grinding and sifting 50 kg of roasting and dedusting ash reg...

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Abstract

The invention relates to high-temperature-resistance low-gas-forming low-expansion and easy-to-scatter precoated sand and a preparation method thereof. The precoated sand comprises the following raw materials of, by weight, silica sand, high-alumina ceramsite sand, clay, fast-modified phenolic resin, high-strength phenolic resin, silane, acrylate, magnesium oxide, ferroferric oxide, a curing agentand a lubricant. According to the precoated sand and the preparation method thereof, the precoated sand adopts the silica sand and the high-alumina ceramsite sand as aggregates, a plurality of kindsof auxiliary agents are added at different production stages, so that the materials cooperate with one another, and the effects that the defects of a casting is overcome, and the defects are preventedare achieved. The formula of the precoated sand is more practical, in addition, the casting temperatures of different metal materials such as cast aluminum, cast iron and cast steel are different, the types of precoated sand commonly used are different, the formula of the precoated sand can be simultaneously suitable for three types of metals, can simultaneously have excellent low-temperature collapsibility and high-temperature heat resistance, is wider in application range, and can help casting enterprises to simplify classification management of raw materials, and improves economic benefits.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a high-temperature-resistant, low-gassing, low-expansion, easy-to-collapse coated sand and a preparation method thereof. Background technique [0002] Ordinary coated sand refers to silica sand, artificial sand, etc. as aggregate, phenolic resin as binder, urotropine as curing agent, calcium stearate as lubricant, and the above raw materials are mixed according to the production process , and finally packaged and stored for use, and used to make foundry sand cores. The production process of ordinary coated sand is as follows: Preheat the aggregate to 120-180°C and put it into the sand mixer, add phenolic resin and mix for 30-60 seconds, then add cooling water to reduce the sand temperature to 110-120°C , then add urotropine and mix for 30 to 50 seconds, finally add calcium stearate and mix for 10 to 15 seconds, then pass through a sieving machine to remove impurity p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/02B22C1/20
CPCB22C1/02B22C1/20
Inventor 包羽冲尹海军冯俊龙李卓情胡文志
Owner HEFEI RENCHUANG CASTING MATERIAL CO LTD