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Sintering-strippable red cast iron coating and preparation method thereof

A peel-off, red technology, used in casting molding equipment, coatings, molds, etc., can solve the problems of poor sintering peelability, difficult to clean up, and difficult to automatically peel off the coating, achieving low production costs and surface quality. The effect of excellent, excellent sintered peelability

Inactive Publication Date: 2012-07-25
湖北省机电研究设计院股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based coatings in the prior art have poor sintering and peeling properties. After the castings are cooled out of the box, the coatings are difficult to peel off automatically. Most of the coatings need to be cleaned by a shot blasting machine. difficult to clean

Method used

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  • Sintering-strippable red cast iron coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw materials: 45% (mass fraction, the same below) bauxite powder, 3% talc powder, 2% ferric oxide powder, 2.5% sodium-based rectorite powder, 4.5% white latex, 2.7% silica sol, 0.03% JFC , 0.05% thymol, 0.1% n-butanol, 0.1% polycarboxylate superplasticizer, 40% water.

[0039] Preparation:

[0040] (1) Add water accounting for 5 times the amount of sodium-based rectorite powder into stirring disperser A, start stirring, and slowly add suspending agent at the same time, continue stirring for more than 1 hour after adding, then let it stand for more than 2 hours, and then add it to the colloid Circulate processing in the mill for 1 to 3 times to obtain colloid A;

[0041](2) Add colloid A to the mixing and dispersing machine B, start stirring for more than 0.5 hours, then gradually add bauxite powder, talcum powder, ferric oxide powder, white latex, silica sol, JFC, and Baili while stirring Phenol, n-butanol, polycarboxylate superplasticizer and the remaining water, af...

Embodiment 2

[0047] Raw materials: 30% powdered quartz, 18% mullite powder, 4% talc powder, 3% ferric oxide powder, 2% sodium-based rectorite powder, 3% water-soluble phenolic resin, 4.7% silica sol, 0.02% polyethylene Alkyl alcohol ether, 0.02% pentachlorophenol, 0.06% n-octanol, 0.2% lignosulfonate sodium salt superplasticizer, 35% tap water.

[0048] Preparation method: with embodiment 1.

[0049] The coating can be widely used in the production of various iron castings. The coating is applied 1-3 times, and the coating thickness is about 0.3-1.5mm. The coating curing method is the same as in Example 1.

[0050] The material cost of the coating is 60-70% of that of the graphite powder coating. It has good sintering and peeling properties. After the casting is opened and cooled, the area ratio of the coating to be automatically peeled off in flakes is ≥90%. The cleaning of the casting is relatively easy and the surface is smooth.

[0051]

Embodiment 3

[0053] Raw materials: 20% bauxite powder, 23% mullite powder, 5% talc powder, 1% ferric oxide powder, 1.5% sodium rectorite powder, 1.5% white latex, 5.5% silica sol, 0.03% JFC, 0.02% pentachlorophenol, 0.05% n-butanol, 0.4% polycarboxylate superplasticizer, 42% tap water.

[0054] Preparation method: with embodiment 1.

[0055] The coating is mainly suitable for the production of large and medium-sized iron castings (a single piece with a mass of more than 1 ton, a wall thickness of more than 50 mm, and a pouring temperature of more than 1350 ° C). The coating is applied 2 to 3 times, and the coating thickness is about 1.0 to 1.5 mm. The coating curing method is the same as in Example 1.

[0056] The material cost of the coating is equivalent to that of graphite powder coating, and the sintering peelability is good. After the casting is opened and cooled, the area ratio of the coating to be automatically peeled off in flakes is ≥95%. The casting is easy to clean and the surf...

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Abstract

The invention relates to a sintering-strippable low-cost red water-based cast iron coating, which is prepared by the following raw materials in percent by mass: 20-45 percent of bauxite powder or powder quartz, 0-25 percent of mullite powder, 1-6 percent of talcum powder, 1-5 percent of iron trioxide powder, 1-3 percent of suspending agent, 1.5-4.5 percent of organic binding agent, 1.5-6 percent of inorganic binding agent, 0.01-0.05 percent of wetting agent, 0.02-0.05 percent of preservative, 0.02-0.1 percent of defoaming agent, 0-0.5 percent of water reducing agent and 30-42 percent of tap water. The sintering-strippable low-cost red water-based cast iron coating has the characteristics that the raw materials are cheap and the source is wide; the product is low-cost, safe, environmental-friendly and convenient to transport; the brushing property, the flowing resistance and the leveling property of the product are good, the suspension percentage, the coating strength and the crack resistance are high and the gas evolution is low; and the sintering-stripping performance is excellent, the most part of the coating can be vastly stripped after castings are taken out of a casting box and are cooled, the defects of sand sticking, sand inclusion, sand drop, voids and the like existing the castings can be effectively avoided, and the castings with excellent surface quality can be obtained.

Description

[0001] [0002] Technical field 3 [0003] The invention relates to a low-cost cast iron paint used in the casting production process, in particular to a sintered peeling red cast iron paint and a preparation method thereof. [0004] Background technique [0005] In the casting production process, the surface quality of the casting mainly depends on the working surface of the mold (core). Applying paint on the working surface of the mold (core) can not only prevent defects such as sand sticking, sand inclusions and pitting on the casting surface, but also reduce the surface roughness of the casting, significantly reduce the cleaning workload of the casting surface, and obtain various benefits Technical effects and good comprehensive economic benefits. [0006] At present, cast iron coatings generally use black microcrystalline graphite powder and flake graphite powder as basic refractory materials. Graphite powder has high refractoriness and low price, and can precipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 冯胜山
Owner 湖北省机电研究设计院股份公司
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