A casting coating for coated sand mold and preparation method thereof

A casting coating and film-coated sand mold technology, which is applied to casting molding equipment, coatings, cores, etc., can solve problems such as the surface quality of castings is not smooth enough, pores or surface air pits are generated in castings, and it is difficult to achieve the surface quality of castings. Achieve the effects of avoiding bubble defects, preventing sticky sand and flow marks, and fast drying of paint

Active Publication Date: 2019-06-11
保定保蒙新型材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the surface roughness of its castings largely depends on the use of coatings
Therefore, the quality of the coating directly determines the surface quality of the casting, and the existing coatings on the market are difficult to achieve the effect of improving the surface quality of the casting.
[0003] Coated sand coating Because the coated sand grains are very fine, the gaps between the sand grains are very small. If the refractory aggregate particles in the coating are not fine enough, the permeability of the coating will decrease, and it will be difficult to fill the gaps, resulting in roughness of the sand mold. High, which makes the surface quality of castings not smooth enough
At the same time, the fine powder coating is prone to dry cracks when it dries, which reduces the air permeability of the coated sand mold, which may cause pores or surface air pits in the casting.

Method used

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  • A casting coating for coated sand mold and preparation method thereof
  • A casting coating for coated sand mold and preparation method thereof
  • A casting coating for coated sand mold and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 100 kg of paint, the steps are as follows:

[0029] (1) Weigh 51 kg of zircon powder, 2.3 kg of sodium bentonite, 1 kg of polyvinyl alcohol, 5 kg of silica sol, 0.2 kg of sodium carboxymethyl cellulose (CMC), 0.2 kg of penetrant JFC, 0.3 kg of defoamer n-butanol, 40 kg of water;

[0030] (2) Zircon powder, sodium bentonite, polyvinyl alcohol, sodium carboxymethyl cellulose are added to the mixer and stirred evenly;

[0031] (3) Take 20 kilograms of water, add silica sol and penetrant JFC into water and stir well to obtain solution A for subsequent use;

[0032] (4) Add solution A into the mixer, stir while adding, and stir for 30 minutes to make the paint into a paste, then add a total of 20 kg of water in two times, and stir for 30 minutes while adding to obtain the product. Can be applied by spray gun or brush.

Embodiment 2

[0034] Prepare 100 kg of paint, the steps are as follows:

[0035] (1) Weigh 49 kg of zircon powder, 3 kg of sodium bentonite, 2 kg of polyvinyl alcohol, 10 kg of silica sol, 0.35 kg of sodium carboxymethyl cellulose (CMC), and 0.25 kg of penetrant JFC-1 according to mass percentage. kg, 0.4 kg of defoamer n-amyl alcohol, 35 kg of water;

[0036] (2) Zircon powder, sodium bentonite, polyvinyl alcohol, sodium carboxymethyl cellulose are added to the mixer and stirred evenly;

[0037] (3) Take 17 kilograms of water, add silica sol and penetrant JFC into water and stir well to obtain solution A for subsequent use;

[0038] (4) Add solution A to the mixer several times, stir while adding, stir for 35 minutes to make the coating paste, then add 18 kg of water in two times, continue stirring for 30 minutes to obtain the product. Can be applied by spray gun or brush.

Embodiment 3

[0040] Prepare 100 kg of paint, the steps are as follows:

[0041] (1) Weigh 51 kg of zircon powder, 2 kg of sodium bentonite, 1 kg of polyvinyl alcohol, 7 kg of silica sol, 0.3 kg of sodium carboxymethyl cellulose (CMC), and 0.35 kg of penetrant JFC-2 according to mass percentage. kg, 0.35 kg of defoamer n-octanol, 38 kg of water;

[0042] (2) Zircon powder, sodium bentonite, polyvinyl alcohol, sodium carboxymethyl cellulose are added to the mixer and stirred evenly;

[0043] (3) Take 19 kg of water, add silica sol and penetrant JFC into water and stir to obtain solution A for subsequent use;

[0044] (4) Add solution A in the mixer several times, stir while adding, stir for 40 minutes to make the coating paste, then add a total of 19 kg of water in two times, continue stirring for 30 minutes to obtain the product. Can be applied by spray gun or brush.

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Abstract

The invention provides a casting coating for a coated sand mold and a preparing method of the casting coating. The casting coating comprises main components including, by mass percent, 49%-51% of zircon powder, 2%-3% of sodium bentonite, 1%-2% of polyvinyl alcohol, 5%-10% of silica sol, 0.2%-0.35% of sodium carboxymethyl cellulose (CMC), 0.2%-0.35% of a penetrating agent JFC, 0.3%-0.4% of an anti-foaming agent and the balance water. The prepared casting coating for the coated sand mold is high in drying speed and smooth in coasting, sand cannot be stuck to the casting obtained after coated sand casting, the coating is resistant to molten steel scouring, the surface finish degree is high, and the quality is good.

Description

technical field [0001] The invention relates to the field of coated sand casting coatings, in particular to a casting coating for coated sand molds and a preparation method thereof. Background technique [0002] The coated sand process has been used by more and more foundry companies due to its short molding cycle, simple process and low production cost. However, due to its casting surface roughness depends largely on the use of paint. Therefore, the quality of the coating directly determines the surface quality of the casting, and the existing coatings on the market are difficult to achieve the effect of improving the surface quality of the casting. [0003] Coated sand coating Because the coated sand grains are very fine, the gaps between the sand grains are very small. If the refractory aggregate particles in the coating are not fine enough, the permeability of the coating will decrease, and it will be difficult to fill the gaps, resulting in roughness of the sand mold. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 张友寿夏露黄晋刘栋李四年
Owner 保定保蒙新型材料科技有限公司
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