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Coating color for accurate core with high permeation and light coating layer

A thin coating and high penetration technology, applied in coatings, mold cores, casting molding equipment, etc., can solve the problems of poor coating resistance to sand sticking and sand washing, low temperature strength of coatings, and dependence on imports, etc., to achieve The sand core has a clear outline, the coating has good permeability, and the effect of high temperature strength

Active Publication Date: 2008-05-14
赵溶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Up to 30% zircon powder is used. my country’s zircon powder resources are scarce, and most of them rely on imports, which are expensive, resulting in limited sources of raw materials for coatings and increased costs.
[0007] 2. There are many refractory aggregate components. If the raw material quality of a certain component fluctuates, it will affect the performance of the entire coating system, and it is difficult to control the sintering performance and other properties of the coating.
[0008] 3. Using polyvinyl alcohol organic binder, the high-temperature strength of the coating is low, and the coating has poor ability to resist sand sticking and sand washing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The selected raw materials are: 41% by weight of microsilica powder, 5% of calcined talc, 3% of cryptocrystalline graphite, 1% of suspending agent, 2% of composite binder, and 47% of deionized water, wherein the particle size of microsilica powder is less than 45 μm, The suspending agent is SN type commercial inorganic clay powder, and the composite binder is prepared by polyvinyl acetate emulsion and silica sol in a weight ratio of 2:3, and then the above raw materials are mixed evenly, and only after passing the test can only be prepared get this product. The coating made according to this embodiment can be used for 70 / 140 precision resin binder sand cores. After testing, its main properties and effects are as follows: 24-hour suspension: greater than or equal to 98%, penetration depth: 1.5mm, coating thickness: 0.18mm, high temperature crack resistance: no cracks, casting surface roughness: Ra 6.3μm to 12.5μm.

Embodiment 2

[0029] The percentage by weight of selected raw materials is: 35% of silicon micropowder, 7% of calcined talc, 4% of cryptocrystalline graphite, 2% of suspending agent, 2% of composite binder, and 50% of deionized water. The suspending agent is SN type commercial inorganic clay powder, the composite binder is prepared by polyvinyl acetate emulsion and silica sol in a weight ratio of 2:3, and then the above raw materials are mixed evenly, and can be obtained after passing the test. This product. The coating made according to this embodiment can be used for 70 / 140 precision resin binder sand cores. After testing, its main properties and effects are as follows: 24-hour suspension: greater than or equal to 98%, penetration depth: 1.8mm, coating thickness: 0.14mm, high temperature crack resistance: no cracks, casting surface roughness: Ra 6.3μm to 12.5μm.

Embodiment 3

[0031] The percentage by weight of selected raw materials is: 37% of silicon micropowder, 6% of calcined talc, 5% of cryptocrystalline graphite, 1.5% of suspending agent, 2.5% of composite binder, and 48% of deionized water. The suspending agent is SN type commercial inorganic clay powder, the composite binder is prepared by polyvinyl acetate emulsion and silica sol in a weight ratio of 2:3, and then the above raw materials are mixed evenly, and can be obtained after passing the test. This product. The coating made according to this embodiment can be used for 70 / 140 precision resin binder sand cores. After testing, its main properties and effects are as follows: 24-hour suspension: greater than or equal to 98%, penetration depth: 1.6mm, coating thickness: 0.15mm, high temperature crack resistance: no cracks, casting surface roughness: Ra 6.3μm to 12.5μm.

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PUM

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Abstract

The invention discloses a dip-coating coating for precision sand core with high permeability and thin coating, which is mainly composed of the following raw materials in terms of weight fraction: 35% to 45% of silicon micropowder, 5% to 10% of calcined talc %, cryptocrystalline graphite 3% to 5%, suspending agent 1% to 2%, composite binder 1.5% to 4%, deionized water 46% to 52%. The dip-coating coating of the present invention is suitable for mass production of resin sand for castings, especially for precision phenolic resin sand cores of coated sands. After the coating is applied to the sand cores, the coating has high strength and strong ability to withstand molten iron mechanical and thermal shocks ;The coating is thin, so that the poured castings have clear contours and high dimensional accuracy, which can meet the requirements of various complex precision castings produced in industries such as automobiles, diesel engines, and hydraulic parts.

Description

technical field [0001] The invention relates to a coating for casting, in particular to a dip-coating coating for precision sand cores with high penetration and thin coating, which is suitable for coating precision shell cores such as film-coated sand in mass production lines. Background technique [0002] At present, in the molding and core preparation process, due to the good formability of the coated sand, the high strength of the sand core, the clear outline, and the high dimensional accuracy, it can manufacture the most complex shell cores, and it has developed rapidly abroad. Now, coated sand has been widely used in automobiles, diesel engines, hydraulic parts and other industries, and can meet the production requirements of various complex precision castings. [0003] The characteristics of coatings for coated sand shell cores are: ① Due to the fine particle size of the shell core sand: generally 70 / 140 and strong surface hydrophobicity, the coating should have strong...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 李远才刘金勇王建平赵溶李沧海王胜
Owner 赵溶
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