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Fireproof precoated sand and preparation method thereof

A coated sand and refractory technology, which is applied in the field of coated sand, can solve problems such as sand sticking defects in castings, achieve the effects of avoiding veining defects, avoiding mechanical sand sticking, and improving fire resistance

Active Publication Date: 2022-04-19
YANCHENG RENCHUANG SAND IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coated sand prepared by using these sand materials is directly used in the production process of steel castings, it will cause serious sand sticking defects in the castings, thus limiting the application of roasting sand, drying sand, and recycled sand in steel castings

Method used

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  • Fireproof precoated sand and preparation method thereof
  • Fireproof precoated sand and preparation method thereof
  • Fireproof precoated sand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a kind of refractory coated sand, which is formed by reacting the following materials in parts by weight:

[0037]

[0038]

[0039] The preparation technology of present embodiment coated sand, comprises the steps:

[0040] (1) Raw sand treatment:

[0041]The raw sand is heated, and the heating temperature is required to be in the range of 180°C to 250°C. The heated raw sand enters the roller sand mixer, and then the liquid refractory material is added. Adjust the rotation speed of the wheel-type sand mixer to 20-30R / s, and stir at this speed for 60-80s to ensure that the active ingredients in the liquid refractory material are evenly coated on the surface of the silica sand particles, and completely solidified on the surface of the silica sand particles to form a hardened layer , to get the first refractory sand material, at this time the corresponding surface layer is called "refractory film layer".

[0042] (2) Sand coating:

[004...

Embodiment 2

[0048] This embodiment provides a kind of refractory coated sand, which is formed by reacting the following materials in parts by weight:

[0049]

[0050] The preparation process of the refractory coated sand of this embodiment is basically the same as that of Embodiment 1.

Embodiment 3

[0052] This embodiment provides a kind of refractory coated sand, which is formed by reacting the following materials in parts by weight:

[0053]

[0054] The preparation process of the refractory coated sand of this embodiment is basically the same as that of Embodiment 1.

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Abstract

The invention provides fire-resistant precoated sand and a preparation method thereof, the fire-resistant precoated sand sequentially comprises a fire-resistant film layer, a resin layer doped with fire-resistant particles and a lubricating layer from inside to outside, and the fire-resistant precoated sand is mainly formed by coating roughing sand, a liquid fire-resistant material, phenolic resin, a solid fire-resistant material, urotropin and a lubricant according to a specific ratio. The refractory precoated sand can effectively improve the refractoriness or heat resistance of precoated sand prepared from roasted sand, dried sand and reclaimed sand, is suitable for production and application of steel castings, and avoids the defect of burnt-on sand.

Description

technical field [0001] The invention relates to the technical field of coated sand, in particular to a refractory coated sand and a preparation method thereof. Background technique [0002] Coated sand is widely used in cast aluminum, cast iron and cast steel, and is one of the best molding materials at present. Coated sand is mainly made of quartz sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials. The preparation methods of coated sand mainly include hot method and cold method. Among them, a large amount of ethanol is used in the cold preparation process, which is abandoned because of a serious threat to production safety. The mainstream production process at this stage is thermal method. The process steps of preparing coated sand by thermal method mainly include: heating the sand to a certain temperature, adding thermoplastic phenolic resin to make it into a molten state, stirring to coat the resin on the surface of the sand, adding h...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 李卓情储茂磊尹海军冯俊龙包羽冲
Owner YANCHENG RENCHUANG SAND IND TECH CO LTD
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