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Method for modifying functional coat of gradient dispersed stuffing grains, and application

A particle gradient and functional technology, applied in coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of decreased wear resistance, loose and discontinuous adhesion of coatings, and mechanical properties that cannot meet the requirements, etc. problems, achieve the effect of reducing weight, ensuring thermal conductivity and electrical conductivity, and reducing the amount of addition

Active Publication Date: 2007-07-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solid particles cannot be well coated by the resin solution, the formed coating is loose and discontinuous, with poor adhesion and mechanical properties that cannot meet the requirements.
As a solid lubricant, metal fillers usually have an optimal content in the preparation of wear-resistant coatings, and the wear resistance will decrease significantly if the content continues to increase.

Method used

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  • Method for modifying functional coat of gradient dispersed stuffing grains, and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Preparation of surface modified conductive coating

[0020] According to the mass parts ratio, 20 parts of silicone resin solution; 30 parts of isopropanol; 14 parts of methyl ethyl ketone (MEK); 7 parts of tin oxide containing antimony trioxide (particle size 0.2 ~ 0.5 microns); spherical iron powder ( (Particle size 200-500 microns) 53 parts. Mix the silicone resin emulsion, isopropanol, and methyl ethyl ketone into a vertical ball mill. Slowly add tin oxide containing antimony trioxide and iron powder particles to grind and disperse for 2 hours. After filtering with a 200 mesh screen, set aside. The aluminum alloy surface is coated by spraying, and the film is cured by infrared heat treatment in a magnetic field. The intensity of the magnetic field is controlled at 8-10 Tesla (T), and the curing temperature is 200 ℃ for 20 minutes. Cancel the applied magnetic field. The conductive coating prepared by the method can be used in various fields such as semiconduct...

Embodiment 2

[0021] Example 2: Modification of anticorrosive heat exchange coating

[0022] Coat the surface of the copper condensate block with a PVDF modified coating, and add 2% of Cr in the polyvinylidene fluoride resin emulsion 2 O 3 Nano particles, particle size of 0.1-0.2 microns; carbonyl iron powder (particle size of 0.5-0.8 microns) 20%; milled by a ball mill for 24 hours, filtered with a 600-mesh sieve, and dispersed by ultrasonic for 30 minutes; air spraying, pressure 0.3MPa. The surface treatment process includes degreasing, roughening, and drying; the heat treatment process is heated in stages under the protection of nitrogen. The temperature rise rate is 3°C / min before 130°C, and the temperature is kept at 130°C for 15 minutes to ensure that the solvent volatilizes slowly. Before heating up to 180°C A magnetic field is applied to make the iron powder particles migrate to the surface under the force of the magnetic field. When the viscosity of the coating increases, the applicati...

Embodiment 3

[0023] Example 3: Epoxy lubricating wear-resistant coating

[0024] Epoxy resin 6101#, 100 parts; Dibutyl phthalate, 10 parts; Epoxybutyl ether 501, 10 parts; Gas phase SiO 2 , 2 parts; spherical iron powder, 40 parts; polytetrafluoroethylene 1 part; graphite 25 parts; molybdenum disulfide, 80 parts; appropriate amount of curing agent. Brush the coating onto the modified surface and place it in an electromagnetic field with an intensity of 8 Tesla, and cure for 8 hours. The adhesion force of the modified coating obtained is level 1. According to GB1769-79 to test the wear resistance of the coating, the result is 0.0142 weight loss.

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Abstract

This invention relates to a method for modifying functional coating layer with gradient filler dispersion, and its application. The coating is waterborne or solvent-type, and utilizes paramagnetic motion of paramagnetic metal and nonmetal particle filler during the dispersion of the coating to realize gradient distribution under magnetic force. The method can realize special functionality of the coating layer by controlling the variety of the magnetic filler, particle morphology and addition amount. Within the coating layer, paramagnetic particles aggregate near the substrate, thus can solve the heat expansion difference between the coating layer and the metal substrate, and can ensure the excellent chemical properties of the organic film-forming material. The magnetic filler aggregating at the surface of the coating layer can obviously increase the hardness, wear resistance and microwave absorbency of the coating layer. In strong magnetic field, the paramagnetic arrangement of neddle-like magnetic particles changes the heat-conductive passage of the coating, and can largely improve the heat-conductivity of the coating.

Description

Technical field [0001] The invention belongs to the technical field of functional materials, and relates to a modification method of a functional coating and its application. Specifically, it involves the use of functional coatings to modify the surface of metal and non-metal, thermal conductivity and anti-corrosion modification of the surface of heat exchange equipment; electronic equipment insulation and anti-static and electromagnetic wave interference; surface wear-resistant modification treatment of parts in mechanical transmission; Functional surface with magnetism, etc. Background technique [0002] With the development of technology and engineering, the requirements for material and product performance are becoming more and more stringent. While developing new varieties of materials, we must also devote ourselves to the modification of existing varieties of materials and design and develop advanced composite technologies. In recent years, the development of resin-based co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D163/00C09D183/04C09D133/00C09D175/04C09D161/06B05D5/12
Inventor 马学虎周兴东兰忠白涛
Owner DALIAN UNIV OF TECH
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