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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 automatic peeling of coatings, and difficult to clean up, achieving low production costs and excellent sintering. The effect of peelability and excellent surface quality

Inactive Publication Date: 2014-02-26
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

[0034] 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% polycarboxylic acid water reducing agent, 40% water.

[0035] Preparation:

[0036] (1) Add 5 times the amount of sodium-based rectorite powder to the mixing and dispersing machine A, start stirring, and slowly add the suspending agent. After the addition, continue to stir for more than 1 hour, then let it stand for more than 2 hours, and then put it in the colloid Circulate processing in the mill for 1 to 3 times to obtain colloid A;

[0037] (2) Add colloid A to the mixing and dispersing machine B. After starting and stirring for more than 0.5 hours, gradually add bauxite powder, talc powder, iron oxide powder, white latex, silica sol, JFC, Baili while stirring. Phenol, n-butanol, polycarboxylic acid water reducing agent and the remaining amount of wat...

Embodiment 2

[0042] Raw material: 30% quartz powder, 18% mullite powder, 4% talc powder, 3% ferric oxide powder, 2% sodium 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 water reducing agent, 35% tap water.

[0043] Preparation method: the same as in Example 1.

[0044] The coating can be widely used in the production of various iron castings. The coating is applied 1 to 3 times, and the coating thickness is about 0.3 to 1.5 mm. The coating curing method is the same as in Example 1.

[0045] The material cost of the coating is 60-70% of that of the graphite powder coating. It has good sintering and peeling properties. The area ratio of the coating automatically peeling off after the casting is cooled out of the box is ≥90%, the casting is easier to clean, and the surface is smooth.

Embodiment 3

[0047] Raw material: 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% polycarboxylic acid water reducing agent, 42% tap water.

[0048] Preparation method: the same as in Example 1.

[0049] 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 50mm or more, and a pouring temperature of 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.

[0050] The material cost of the coating is equivalent to that of the graphite powder coating, and the sintering peelability is good. After the casting is cooled out of the box, the area ratio of the coating to be automatically peeled off is ≥95%, the casting is easy to clean, and the surface is sm...

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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

Technical field 3 [0001] 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. Background technique [0002] 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. [0003] 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 bright carbon at the pourin...

Claims

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Application Information

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Patent Type & Authority Patents(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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