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High-temperature-resistant precoated sand and preparation method thereof

A technology of high temperature resistance and coated sand, which is applied in the field of coated sand, can solve the problems that the casting process of coated sand shell and membrane core has not been fully used, high temperature resistance, low gas generation, and high pouring pressure, so as to achieve high strength and reduce Excellent temperature and pressure resistance and film coating performance

Pending Publication Date: 2022-04-19
天阳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (4) The collapsibility is better, and the casting is easier to clean
[0008] However, the traditional coated sand casting process can only meet the requirements of 2"~6" valve castings, including the shape and core. For castings over 6" due to their large wall thickness and high pouring pressure, the coated sand shell membrane shell core casting process has not yet fully used
Ordinary valve coated sand is composed of natural silica sand, phenolic resin, high temperature resistant additives, urotropine and calcium stearate. casting

Method used

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  • High-temperature-resistant precoated sand and preparation method thereof
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  • High-temperature-resistant precoated sand and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The production process of high temperature resistant coated sand in this embodiment is as follows:

[0052] (1) Weigh 475kg of high-silicon recycled sand and 25kg of imported South African natural iron ore, and heat to 150°C;

[0053] (2) Put the aggregate at 150°C into the mixing equipment, add 2.5kg of graphite powder and 1.0kg of high temperature resistant additive material and stir for 10s;

[0054] (3) 16kg of phenolic resin and 2.08kg of curing agent are added to the mixing equipment and stirred for 60s to completely mix the phenolic resin and curing agent;

[0055] (4) After the phenolic resin and the curing agent are completely mixed evenly, add 1.1kg of lubricant and stir for 30s to disperse the lumps and form coated particles;

[0056] (5) After the mixing is completed, crush and sieve, and cool to room temperature to obtain high-temperature-resistant coated sand.

[0057] The first time in the above step (5) is crushing through the eccentric running roller ...

Embodiment 2

[0059] The production process of high temperature resistant coated sand in this embodiment is as follows:

[0060] (1) Weigh 450kg of high-silicon recycled sand and 50kg of imported South African natural iron ore, and heat to 150°C;

[0061] (2) Put the aggregate at 150°C into the mixing equipment, add 2.5kg of graphite powder and 1.0kg of high temperature resistant additive material and stir for 12s;

[0062] (3) 16kg phenolic resin and 2.08kg curing agent were added to the mixing equipment and stirred for 62s to completely mix the phenolic resin and curing agent;

[0063] (4) After the phenolic resin and the curing agent are completely mixed evenly, add 1.1kg of lubricant and stir for 32s to disperse the lumps and form coated particles;

[0064] (5) After the mixing is completed, crush and sieve, and cool to room temperature to obtain high-temperature-resistant coated sand.

[0065] The first time in the above step (5) is crushing through the eccentric running roller of th...

Embodiment 3

[0067] The production process of high temperature resistant coated sand in this embodiment is as follows:

[0068] (1) Weigh 475kg of high-silicon recycled sand and 25kg of imported South African natural iron ore, and heat to 155°C;

[0069] (2) Put the aggregate at 155°C into the mixing equipment, add 2.5kg of graphite powder and 1.0kg of high temperature resistant additive material and stir for 14s;

[0070] (3) 17.5kg phenolic resin and 2.08kg curing agent were added to the mixing equipment and stirred for 64s to completely mix the phenolic resin and curing agent;

[0071] (4) After the phenolic resin and the curing agent are completely mixed evenly, add 1.1kg of lubricant and stir for 34s to disperse the lumps and form coated particles;

[0072] (5) After the mixing is completed, crush and sieve, and cool to room temperature to obtain high-temperature-resistant coated sand.

[0073] The first time in the above step (5) is crushing through the eccentric running roller of ...

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Abstract

The invention belongs to the technical field of precoated sand, and relates to high-temperature-resistant precoated sand and a preparation method thereof. 90-96% of high-silicon reclaimed sand and 4-10% of natural iron ore sand are used as aggregates, isopropyl triphenyl phosphate modified phenolic resin is used, a high-temperature-resistant additive and graphite are combined, stirring, mixing and reaction are conducted in mixing equipment, and the prepared precoated sand has high strength and good heat conductivity and can meet the requirements of certain heavy valve castings, high-temperature-resistant valve castings, high-temperature-resistant valve castings, high-temperature-resistant valve castings, high-temperature-resistant valve castings, high-temperature-resistant valve castings, high-temperature-resistant valve castings and high-temperature-resistant valve castings. And the application field of the precoated sand is widened.

Description

technical field [0001] The invention belongs to the technical field of coated sand, and relates to a high-temperature-resistant coated sand and a preparation method thereof. Background technique [0002] Coated sand is prepared by phenolic resin plus latent curing agent and lubricant through a certain coating process. When heated, the resin coated on the surface of the sand melts. The molten body structure makes the coated sand solidify and form. The earliest use was thermosetting resin, and now it has been developed to use thermoplastic phenolic resin. [0003] The coated sand has excellent performance, and the molded shell has good formability, clear outline, and good surface quality. It also has the following advantages: [0004] (1) The strength can be properly adjusted to meet the necessary process strength requirements of cast iron and cast steel for molding sand; [0005] (2) It has good fluidity and strong filling ability, and can manufacture complex sand cores, s...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B22C1/10B22C1/22B22C5/00B22C5/04B22C5/06B22C5/08
CPCB22C1/00B22C1/2253B22C1/10B22C1/02B22C5/00B22C5/0409B22C5/06B22C5/08Y02W30/91
Inventor 雷文港张显旺朱运隆
Owner 天阳新材料科技有限公司