Aluminum alloy die casting defect mending agent and preparation method thereof

A defect repair and die-casting technology, applied in conductive coatings, coatings, anti-corrosion coatings, etc., can solve problems such as affecting the appearance of repairs, the appearance and color difference of die-casting aluminum substrates, and high temperature shrinkage toughness.

Inactive Publication Date: 2017-04-26
ZTE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. It does not have a conductive function, but only has a certain appearance repair function. After repair, it will affect the electromagnetic shielding function of the communication equipment shell to a certain extent;
[0005] 2. The thermal conductivity is not good, the heat dissipation of the repaired communication equipment shell will be affected, and the key parts of the shell will have a temperature rise exceeding the allowable temperature when the equipment is working;
[0006] 3. The high temperature resistance is not good. Under high temperature conditions, the repaired position will turn yellow and shrink to varying degrees, and small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 1. Prepare materials according to the following mass ratio:

[0092] Polypropylene glycol diglycidyl ether 2.5%, fluorescent whitening agent 0.01%, nano-silica modified bisphenol F epoxy resin 11%, bisphenol A epoxy resin 27.5%, antioxidant 0.4%, conductive silver-coated copper powder 49.59%, non-leafing aluminum powder 9%;

[0093] Methylcyclohexanediamine 37.8%, spirodiamine 22.5%, bisphenol A epoxy resin 22%, liquid petroleum resin 17%, γ-aminopropyltrimethoxysilane 0.7%.

[0094] 2. Prepare the first component:

[0095] adding the fluorescent whitening agent into polypropylene glycol diglycidyl ether, and stirring evenly to obtain a fluorescent whitening agent solution;

[0096] Add the nano-silica modified bisphenol F epoxy resin, bisphenol A epoxy resin, antioxidant and fluorescent whitening agent solution into the vacuum mixer, start the heating water bath of the vacuum mixer, and heat the temperature in the kettle to 50°C , turn on the vacuum mixer and stir i...

Embodiment 2

[0111] 1. Prepare materials according to the following mass ratio:

[0112] Polypropylene glycol diglycidyl ether 2%, fluorescent whitening agent 0.005%, nano-silica modified bisphenol F epoxy resin 12%, bisphenol A epoxy resin 25%, antioxidant 0.5%, conductive silver-coated copper powder 50.495%, non-leafing aluminum powder 10%;

[0113] Methylcyclohexanediamine 35%, spirodiamine 25%, bisphenol A epoxy resin 20%, liquid petroleum resin 19.5%, γ-aminopropyltrimethoxysilane 0.5%.

[0114] 2. Prepare the first component:

[0115] adding the fluorescent whitening agent into polypropylene glycol diglycidyl ether, and stirring evenly to obtain a fluorescent whitening agent solution;

[0116] Add the nano-silica modified bisphenol F epoxy resin, bisphenol A epoxy resin, antioxidant and fluorescent whitening agent solution into the vacuum mixer, start the heating water bath of the vacuum mixer, and heat the temperature in the kettle to 40°C , turn on the vacuum mixer and stir it f...

Embodiment 3

[0131] 1. Prepare materials according to the following mass ratio:

[0132] Polypropylene glycol diglycidyl ether 3%, fluorescent whitening agent 0.7%, nano-silica modified bisphenol F epoxy resin 10%, bisphenol A epoxy resin 30%, antioxidant 0.3%, conductive silver-coated copper powder 48%, non-leafing aluminum powder 8%;

[0133] Methylcyclohexanediamine 40%, spirodiamine 20%, bisphenol A epoxy resin 23%, liquid petroleum resin 16.5%, γ-aminopropyltriethoxysilane 0.5%.

[0134] 2. Prepare the first component:

[0135] adding the fluorescent whitening agent into polypropylene glycol diglycidyl ether, and stirring evenly to obtain a fluorescent whitening agent solution;

[0136] Add nano-silica modified bisphenol F epoxy resin, bisphenol A epoxy resin, antioxidant and fluorescent whitening agent solution into the vacuum mixer, start the heating water bath of the vacuum mixer, and heat the temperature in the kettle to 45°C , turn on the vacuum mixer and stir it for 10min to ...

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Abstract

The invention provides an aluminum alloy die casting defect mending agent. The aluminum alloy die casting defect mending agent comprises a first component and a second component; the first component comprises polypropylene glycol diglycidyl ether, a fluorescent brighting agent, an antioxidant, silver coated copper powder and nonleafing aluminum powder; the second component comprises methylcyclohexanediamine, spirocyclic diamine, bisphenol A epoxy resin, liquid petroleum resin and a coupling agent; a mass ratio of the first component to the second component is (7-8):1; and the first component also comprises nano-silica modified bisphenol F epoxy resin and bisphenol A epoxy resin. The mending agent can be used for filling casting pores, shrinkage cavities, sand holes and cracks with different sizes, can work at -60-210 DEG C, has no color change or blackening phenomenon under high temperature conditions, has consistent color with a die casting aluminum alloy matrix, has high bonding strength with the matrix metal, does not shrink at a high temperature after being cured, and also has the advantages of high application property, good thixotropy, good acid, alkali and corrosion resistance, and good electricity and heat conduction performances.

Description

technical field [0001] The invention relates to a defect repairing agent for aluminum alloy die castings, in particular to a repairing agent for repairing defects of die castings of aluminum alloy communication equipment shells, and belongs to the technical field of chemical repairing agents. Background technique [0002] Aluminum alloy die castings will have defects such as pores, shrinkage cavities, sand holes, cracks, etc., which will affect the electromagnetic shielding performance and appearance of the communication equipment housing, resulting in the scrapping of the die casting housing and increasing the production cost. [0003] Manufacturers will take some repair measures to remedy casting defects. The main component of existing aluminum alloy die-casting defect repair agents on the market is amine-cured epoxy resin mixed with a small amount of flake aluminum powder, which can fill and repair pores and sand holes. Improve the appearance of the housing of communicati...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/10C09D5/24C09D7/12
CPCC08K2201/011C08L2201/08C08L2205/025C08L2205/035C09D5/103C09D5/24C09D7/61C09D7/63C09D7/65C09D163/00C08L63/00C08L23/26C08K13/06C08K9/10C08K2003/085C08K2003/0812C08K3/36
Inventor 王金娥邵聪赖晓明杨洪亮谭海丰张晓辉
Owner ZTE CORP
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