CN110305559B - Corrosion-resistant heat-conducting coating and preparation method thereof - Google Patents
Corrosion-resistant heat-conducting coating and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention discloses a corrosion-resistant heat-conducting coating and a preparation method thereof, wherein the coating comprises the following components in parts by weight: 100-120 parts of water-based film-forming resin, 30-40 parts of curing agent, 0.3-0.6 part of flatting agent, 0.2-0.4 part of defoaming agent, 10-20 parts of carboxylic acid modified boron nitride, 0.5-1.5 parts of fluorinated graphene oxide and 50-80 parts of diluent. The carboxylic acid phthalocyanine and hydrogen peroxide are used as raw materials to sequentially modify the hexagonal boron nitride, and the modified filler has good compatibility with a coating matrix, so that the prepared coating has good stability and excellent mechanical property, and the heat dissipation performance of the coating is effectively improved; the modified compound has a pi-pi stacking structure, increases the specific surface area, effectively improves the adsorption effect of the coating and the substrate, can also greatly improve the barrier property of the coating, prolongs the corrosive medium diffusion channel and greatly improves the corrosion resistance of the coating. The raw materials are simple and easy to obtain, no Volatile Organic Compounds (VOCs) exist, the method is safe, environment-friendly, low in cost, simple and easy to control, easy to realize industrial production and good in application prospect.
Description
Technical Field
The invention relates to the technical field of heat-conducting coatings, in particular to a corrosion-resistant heat-conducting coating and a preparation method thereof.
Background
The heat conducting coating aims at improving the heat dissipation efficiency of the surface of a coated object and reducing the internal temperature of a system. At present, a common heat-conducting coating mainly uses a polymer as a film-forming substance, and a filler with high heat conductivity is added to enhance the heat-conducting capacity of the coating so as to achieve the purposes of heat dissipation and temperature reduction. There are two problems in the use process: firstly, most of the film forming agent is oleoresin, and toxic solvents such as toluene, xylene, dichloromethane and the like are commonly adopted as solvents, so that the film forming agent causes great harm to human health and environment; secondly, when the radiator is used, heat accumulation can be caused at partial positions, and aging of the organic heat dissipation coating is accelerated, so that the heat conduction coating not only needs to have the capability of timely guiding out heat in a system, but also needs to have certain corrosion resistance, and development of the environment-friendly high-heat-conduction corrosion-resistant coating becomes a development direction of the research field.
Hexagonal boron nitride (h-BN) is an isoelectric substance of graphite, has a layered structure similar to graphite, and is called "white graphite". Besides the good lubricity, mechanical property and thermal conductivity similar to those of graphite, the h-BN also has a plurality of unique properties, such as good insulation (the band gap width is 5.2-5.8eV), high thermal stability (the using temperature can reach 2800 ℃ in a nitrogen atmosphere), difficult oxidation (the oxidation temperature is higher than 800 ℃), good radiation resistance and good biocompatibility. In recent years, extensive attention has been paid to research on improvement of thermal properties and insulating flame retardancy of polymer matrices by using h-BN nanotubes or nanosheets as fillers.
The high-temperature-resistant heat-conducting insulating type adhesive coating is prepared by taking epoxy resin modified organic silicon as a matrix and boron nitride and aluminum oxide mixed filler as heat-conducting particles, such as periwinkle and the like, and has good heat-conducting performance, but the dispersibility in an organic solvent and an epoxy resin matrix is poor due to the fact that h-BN has stable chemical properties, active groups are lacked on the surface, and strong interaction is lacked between the h-BN and most organic molecules and polymer molecular chains. The invention patent CN 108753001A discloses a high-peel-strength heat-conducting coating and a preparation method thereof, which comprises carbon fiber modified mixed resin AlN, BN and SiO2The coating disclosed by the invention has the advantages that the mechanical property and the heat conduction property of the coating are better, but the preparation process is more complex and is not environment-friendly. Special purpose of the inventionCN 105385334A discloses a preparation method of a two-component waterborne polyurethane transparent heat-conducting coating, wherein a waterborne polyurethane dispersoid is a component A, a waterborne polyurethane curing agent is a component B, and alumina and graphite oxide are used as heat-conducting fillers and other auxiliaries. The aqueous two-component polyurethane with good hardness, weather resistance, water resistance and wear resistance is synthesized by modifying the aqueous polyurethane through the hydroxyl-terminated organic silicon resin, but the defects of poor dispersibility and poor adhesive force of inorganic filler particles exist. The invention patent CN201810088733.3 discloses a preparation method of a high-thermal-conductivity coating, which comprises the steps of firstly preparing isopropanol dispersion liquid of boron nitride nanosheets by adopting a solvent stripping method, then taking the isopropanol dispersion liquid as a reaction system, dropwise adding a silane coupling agent and tetrabutyl titanate, effectively controlling the hydrolysis speed of the tetrabutyl titanate under the action of water-containing nitrogen, and finally carrying out high-temperature treatment to prepare the boron nitride nanosheets/nano titanium oxide composite material.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a corrosion-resistant heat-conducting coating, which solves the problems of poor dispersibility of a filler, namely boron nitride, poor coating adhesion, poor corrosion resistance and use of a volatile solvent in the conventional heat-conducting coating.
In order to solve the technical problems, the invention adopts the following technical scheme: the corrosion-resistant heat-conducting coating comprises the following components in parts by weight: 100-120 parts of water-based film-forming resin, 30-40 parts of curing agent, 0.3-0.6 part of flatting agent, 0.2-0.4 part of defoaming agent, 10-20 parts of carboxylic acid modified boron nitride, 0.5-1.5 parts of fluorinated graphene oxide and 50-80 parts of diluent.
The carboxylic acid modified boron nitride is a compound formed by modifying hydroxyl boron nitride with carboxylic acid phthalocyanine, so that on one hand, the modification of the active functional groups of the hexagonal boron nitride nanoparticles is realized, the dispersibility and the chemical activity of the hexagonal boron nitride nanoparticles are improved, and the carboxylic acid modified boron nitride can be uniformly dispersed in the film-forming resin; on the other hand, the planar macrocyclic pi conjugated structure of the carboxylic phthalocyanine in the compound can form a pi-pi accumulation structure with boron nitride, so that the barrier property of the coating can be greatly improved, a corrosive medium diffusion channel is prolonged, and a good corrosion resistant system is formed; and by compounding fluorinated graphene, the fluorinated graphene not only has good chemical stability and thermal conductivity, but also has low surface free energy, so that the thermal conductivity and corrosion resistance of the coating are further improved. On the other hand, the carboxylic acid modified boron nitride and the fluorinated graphene both have pi conjugated structures, and when the carboxylic acid modified boron nitride and the fluorinated graphene are dispersed in resin, pi-pi accumulation occurs to form a relatively stable structure, so that the sedimentation of the fluorinated graphene is avoided.
Preferably, the aqueous film-forming resin is aqueous epoxy resin emulsion or aqueous acrylic resin emulsion, the viscosity is less than 50 Pa.s, the solid content is 38-42%, and the pH value is 7-9; the curing agent is an aqueous emulsion of an aromatic amine epoxy curing agent, the viscosity is less than 10 Pa.s, the solid content is 40%, and the pH value is 11-13.
Preferably, the diluent is deionized water; the leveling agent is Efka3570 or Efka 3580; the antifoaming agent is Efka2560, Efka2570 or Efka 2580.
Preferably, the fluorinated graphene has a fluorine-carbon ratio of 0.8 to 1.1 and a particle size of 4 to 10 μm.
Preferably, the carboxylic acid modified boron nitride is prepared by the following method:
1) adding hexagonal boron nitride micro-nano powder into a reaction kettle filled with hydrogen peroxide, placing the reaction kettle in a water bath at 100 ℃ for reaction for 24-48 hours after ultrasonic dispersion, performing ultrasonic treatment for 10-20 min every 2-3 hours in the reaction process, evaporating a solvent after the reaction is finished, washing the solid with deionized water for 2-5 times, and performing vacuum drying to obtain the boron nitride hydroxide;
2) adding deionized water into the hydroxyl boron nitride obtained in the step 1), performing ultrasonic dispersion for 2-5 h, adding carboxylic phthalocyanine, continuing performing ultrasonic treatment for 1-2 h, heating to 70-90 ℃, reacting for 4-5 h, reducing the temperature to room temperature under vigorous stirring, and centrifuging, washing and drying to obtain the carboxylic acid modified boron nitride.
Preferably, the particle size of the boron nitride micro-nano powder is less than 20 microns, and the concentration of hydrogen peroxide is 30%; the mass ratio of the boron nitride to the hydrogen peroxide is 1: 50-150.
Preferably, the mass ratio of the hydroxyl boron nitride to the deionized water is 1: 200-500.
Preferably, the carboxylic phthalocyanine is tetracarboxylic acid zinc phthalocyanine, tetracarboxylic acid cobalt phthalocyanine or tetracarboxylic acid iron phthalocyanine; the mass ratio of the hydroxyl boron nitride to the carboxylic acid phthalocyanine is 1: 1-1.5.
The invention also provides a coating formed by the corrosion-resistant heat-conducting coating.
The invention also provides a preparation method of the corrosion-resistant heat-conducting coating, which comprises the following steps: weighing raw materials according to a formula, mixing the aqueous film-forming resin, the carboxylic acid modified boron nitride, the fluorinated graphene oxide, the diluent, the flatting agent and the defoaming agent, fully dispersing, filtering to obtain a mixed solution, adding the curing agent into the mixed solution, and fully mixing to obtain the corrosion-resistant heat-conducting coating.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the mixed filler of carboxylic acid modified boron nitride and fluorinated graphene is adopted to synergistically increase the heat conductivity and corrosion resistance of the coating, so that the coating has good heat conductivity, wear resistance, corrosion resistance and adhesive force, and the carboxylic acid modified boron nitride and the fluorinated graphene compound are uniformly dispersed, do not agglomerate and do not settle in the aqueous film-forming resin under the action of pi-pi accumulation, so that the problems of poor corrosion resistance, poor adhesive force and poor dispersibility of boron nitride of the existing heat-conducting coating are solved, and the heat-conducting coating can be widely applied to the fields of chemical industry, petroleum, electric power, traffic, aerospace and the like, and the application range of the heat-conducting coating is expanded.
2. According to the invention, carboxylic acid phthalocyanine and hydrogen peroxide are used as raw materials to sequentially modify hexagonal boron nitride, and the modified filler has good compatibility with a coating matrix, so that the prepared coating has good stability and excellent mechanical properties, and the heat dissipation performance of the coating is effectively improved; and the modified compound has a pi-pi stacking structure, increases the specific surface area, effectively improves the adsorption effect of the coating and the substrate, can also greatly improve the barrier property of the coating, prolongs the corrosive medium diffusion channel and greatly improves the corrosion resistance of the coating. And the thermal conductivity and corrosion resistance of the coating are further improved by compounding the fluorinated graphene, and the carboxylic acid modified boron nitride and the fluorinated graphene generate pi-pi stacking effect to form a relatively stable structure so as to be uniformly dispersed in the resin, so that the sedimentation of the fluorinated graphene and the uneven dispersion of the boron nitride are avoided.
3. The preparation method has the advantages of simple and easily-obtained raw materials, no Volatile Organic Compounds (VOCs), no toxic solvent, safety, environmental protection, low cost, simple and easily-controlled operation of the preparation method, easy realization of industrial production and good application prospect.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation method of corrosion-resistant heat-conducting coating
Example 1
The corrosion-resistant heat-conducting coating comprises the following components in parts by weight: 100 parts of water-based film-forming resin, 30 parts of curing agent, 0.4 part of flatting agent, 0.2 part of defoaming agent, 10 parts of carboxylic acid modified boron nitride, 1.5 parts of fluorinated graphene oxide and 50 parts of diluent.
1) Adding hexagonal boron nitride micro-nano powder with the particle size of less than 20 microns into a reaction kettle filled with 30% hydrogen peroxide to ensure that the mass ratio of boron nitride to hydrogen peroxide is 1: 50, carrying out ultrasonic dispersion for 5min, then placing the reaction kettle into a water bath at 100 ℃ for reaction for 48h, carrying out ultrasonic treatment for 15min every 3h in the reaction process, evaporating a solvent after the reaction is finished, washing the solid for 3 times by using deionized water, and carrying out vacuum drying to obtain the hydroxyl boron nitride.
2) Adding deionized water into the hydroxyl boron nitride obtained in the step 1), performing ultrasonic dispersion for 5h, adding carboxylic phthalocyanine, performing continuous ultrasonic treatment for 2h, wherein the mass ratio of the hydroxyl boron nitride to the deionized water to the carboxylic phthalocyanine is 1: 200: 1, heating to 70 ℃, reacting for 5h, reducing the temperature to room temperature (20-35 ℃) through violent stirring, centrifuging, washing and drying to obtain the carboxylic acid modified boron nitride.
3) Weighing water-based epoxy resin emulsion (with the viscosity of less than 50 Pa.s, the solid content of 38-42% and the pH of 7-9), carboxylic acid modified boron nitride, fluorinated graphene oxide (with the fluorine-carbon ratio of 0.8-1.1 and the particle size of 4-10 mu m), deionized water, Efka3570 and Efka2560 according to the formula, mixing, fully dispersing, filtering to obtain a mixed solution, adding the water-based emulsion (with the viscosity of less than 10 Pa.s, the solid content of 40% and the pH of 11-13) added with the aromatic amine epoxy curing agent into the mixed solution, and fully mixing to obtain the corrosion-resistant heat-conducting coating.
Example 2
The corrosion-resistant heat-conducting coating comprises the following components in parts by weight: 110 parts of water-based film-forming resin, 35 parts of curing agent, 0.3 part of flatting agent, 0.3 part of defoaming agent, 15 parts of carboxylic acid modified boron nitride, 1.0 part of fluorinated graphene oxide and 60 parts of diluent.
1) Adding hexagonal boron nitride micro-nano powder with the particle size of less than 20 microns into a reaction kettle filled with 30% hydrogen peroxide, enabling the mass ratio of boron nitride to hydrogen peroxide to be 1: 100, carrying out ultrasonic dispersion for 5min, then placing the reaction kettle into a water bath at 100 ℃ for reaction for 48h, carrying out ultrasonic treatment for 15min every 3h in the reaction process, evaporating a solvent after the reaction is finished, washing the solid for 3 times by using deionized water, and carrying out vacuum drying to obtain the hydroxyl boron nitride.
2) Adding deionized water into the hydroxyl boron nitride obtained in the step 1), performing ultrasonic dispersion for 5h, adding carboxylic phthalocyanine, performing continuous ultrasonic treatment for 2h, wherein the mass ratio of the hydroxyl boron nitride to the deionized water to the carboxylic phthalocyanine is 1: 300: 1.2, heating to 80 ℃, reacting for 5h, reducing the temperature to room temperature (20-35 ℃) after violent stirring, and obtaining the carboxylic acid modified boron nitride after centrifugation, washing and drying.
3) Weighing water-based epoxy resin emulsion (with the viscosity of less than 50 Pa.s, the solid content of 38-42% and the pH of 7-9), carboxylic acid modified boron nitride, fluorinated graphene oxide (with the fluorine-carbon ratio of 0.8-1.1 and the particle size of 4-10 mu m), deionized water, Efka3580 and Efka2570 according to the formula, mixing, fully dispersing, filtering to obtain a mixed solution, adding the water-based emulsion (with the viscosity of less than 10 Pa.s, the solid content of 40% and the pH of 11-13) added with the aromatic amine epoxy curing agent into the mixed solution, and fully mixing to obtain the corrosion-resistant heat-conducting coating.
Example 3
The corrosion-resistant heat-conducting coating comprises the following components in parts by weight: 120 parts of water-based film-forming resin, 40 parts of curing agent, 0.5 part of flatting agent, 50.4 parts of defoaming agent, 20 parts of carboxylic acid modified boron nitride, 0.5 part of fluorinated graphene oxide and 70 parts of diluent.
1) Adding hexagonal boron nitride micro-nano powder with the particle size of less than 20 microns into a reaction kettle filled with 30% hydrogen peroxide to ensure that the mass ratio of boron nitride to hydrogen peroxide is 1: 150, carrying out ultrasonic dispersion for 5min, then placing the reaction kettle into a water bath at 100 ℃ for reaction for 48h, carrying out ultrasonic treatment for 15min every 3h in the reaction process, evaporating a solvent after the reaction is finished, washing the solid for 3 times by using deionized water, and carrying out vacuum drying to obtain the hydroxyl boron nitride.
2) Adding deionized water into the hydroxyl boron nitride obtained in the step 1), performing ultrasonic dispersion for 5h, adding carboxylic phthalocyanine, performing continuous ultrasonic treatment for 2h, wherein the mass ratio of the hydroxyl boron nitride to the deionized water to the carboxylic phthalocyanine is 1: 400: 1.4, heating to 90 ℃, reacting for 5h, reducing the temperature to room temperature (20-35 ℃) after violent stirring, and obtaining the carboxylic acid modified boron nitride after centrifugation, washing and drying.
3) Weighing water-based epoxy resin emulsion (with the viscosity of less than 50 Pa.s, the solid content of 38-42% and the pH of 7-9), carboxylic acid modified boron nitride, fluorinated graphene oxide (with the fluorine-carbon ratio of 0.8-1.1 and the particle size of 4-10 mu m), deionized water, Efka3570 and Efka2580 according to the formula, mixing, fully dispersing, filtering to obtain a mixed solution, adding the water-based emulsion (with the viscosity of less than 10 Pa.s, the solid content of 40% and the pH of 11-13) added with the aromatic amine epoxy curing agent into the mixed solution, and fully mixing to obtain the corrosion-resistant heat-conducting coating.
Example 4
The corrosion-resistant heat-conducting coating comprises the following components in parts by weight: 110 parts of water-based film-forming resin, 40 parts of curing agent, 0.6 part of flatting agent, 0.4 part of defoaming agent, 20 parts of carboxylic acid modified boron nitride, 1.0 part of fluorinated graphene oxide and 80 parts of diluent.
1) Adding hexagonal boron nitride micro-nano powder with the particle size of less than 20 microns into a reaction kettle filled with 30% hydrogen peroxide to ensure that the mass ratio of boron nitride to hydrogen peroxide is 1: 150, carrying out ultrasonic dispersion for 5min, then placing the reaction kettle into a water bath at 100 ℃ for reaction for 48h, carrying out ultrasonic treatment for 15min every 3h in the reaction process, evaporating a solvent after the reaction is finished, washing the solid for 3 times by using deionized water, and carrying out vacuum drying to obtain the hydroxyl boron nitride.
2) Adding deionized water into the hydroxyl boron nitride obtained in the step 1), performing ultrasonic dispersion for 5h, adding carboxylic phthalocyanine, performing continuous ultrasonic treatment for 2h, wherein the mass ratio of the hydroxyl boron nitride to the deionized water to the carboxylic phthalocyanine is 1: 500: 1.5, heating to 90 ℃, reacting for 5h, reducing the temperature to room temperature (20-35 ℃) after violent stirring, and obtaining the carboxylic acid modified boron nitride after centrifugation, washing and drying.
3) Weighing water-based epoxy resin emulsion (with the viscosity of less than 50 Pa.s, the solid content of 38-42% and the pH of 7-9), carboxylic acid modified boron nitride, fluorinated graphene oxide (with the fluorine-carbon ratio of 0.8-1.1 and the particle size of 4-10 mu m), deionized water, Efka3580 and Efka2580 according to the formula, mixing, fully dispersing, filtering to obtain a mixed solution, adding the water-based emulsion (with the viscosity of less than 10 Pa.s, the solid content of 40% and the pH of 11-13) added with the aromatic amine epoxy curing agent into the mixed solution, and fully mixing to obtain the corrosion-resistant heat-conducting coating.
Secondly, product detection
The performance of the corrosion-resistant heat-conducting coating prepared in examples 1 to 4 was verified, and the results are shown in table 1.
TABLE 1
| Sample (I) | Example 1 | Example 2 | Example 3 | Examples4 | Detection method |
| Appearance of the product | Colorless transparent liquid | Light yellow transparent liquid | Colorless transparent liquid | Colorless transparent liquid | Visual inspection of |
| Solids content/% | 20 | 21 | 23 | 22 | GB/T 9761–1988 |
| Viscosity/s | 18 | 21 | 20 | 20 | GB/T 1723-1993 |
| Paint film appearance | Dark grey | Grey colour | White colour | Off-white color | GB/T 9761–1988 |
| Film thickness/. mu.m | 23 | 22 | 24 | 24 | GB/T1727-92 |
| Adhesion/grade | 0 | 0 | 0 | 0 | GB/T 9286-1998 |
| Abrasion resistance/mg | 17 | 15 | 16 | 18 | GB/T1768-79(89) |
| Neutral salt fog resistance per hour | 1000 | 1000 | 1000 | 1000 | GB/T1771-1991 |
| Resistance to Artificial aging/h | 3000 | 3000 | 3000 | 3000 | GB/T 1766-1995 |
| Thermal conductivity/W.m-1·K-1 | 0.519 | 0.649 | 0.778 | 0.859 | ANSI/ASTM D5470-2006 |
As can be seen from Table 1, the coating prepared by the invention has good thermal conductivity, wear resistance, corrosion resistance and adhesive force, avoids using volatile toxic solvent, and is safe, environment-friendly and non-toxic. Wherein, the adhesive force can reach 0 grade, the binding force with the base material is increased, the construction performance of the coating is improved, and the problems of cracking, peeling, falling and the like of the coating are avoided.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The corrosion-resistant heat-conducting coating is characterized by comprising the following components in parts by weight: 100-120 parts of water-based film-forming resin, 30-40 parts of curing agent, 0.3-0.6 part of flatting agent, 0.2-0.4 part of defoaming agent, 10-20 parts of carboxylic acid modified boron nitride, 0.5-1.5 parts of fluorinated graphene oxide and 50-80 parts of diluent;
the carboxylic acid modified boron nitride is prepared by the following method:
1) adding hexagonal boron nitride micro-nano powder into a reaction kettle filled with hydrogen peroxide, carrying out ultrasonic dispersion, then placing the reaction kettle in a water bath at the temperature of 95-110 ℃ for reaction for 24-48 h, carrying out ultrasonic treatment for 10-20 min every 2-3 h in the reaction process, evaporating a solvent after the reaction is finished, washing a solid with deionized water for 2-5 times, and carrying out vacuum drying to obtain boron nitride hydroxide;
2) adding the hydroxyl boron nitride obtained in the step 1) into deionized water, performing ultrasonic dispersion for 2-5 h, adding carboxylic phthalocyanine, performing ultrasonic treatment for 1-2 h, heating to 70-90 ℃, reacting for 4-5 h, reducing the temperature to room temperature under vigorous stirring, and performing centrifugation, washing and drying to obtain the carboxylic acid modified boron nitride.
2. The corrosion-resistant heat-conducting coating as claimed in claim 1, wherein the aqueous film-forming resin is an aqueous epoxy resin emulsion, the viscosity is less than 50 pa.s, the solid content is 38-42%, and the pH is 7-9; the curing agent is an aqueous emulsion of an aromatic amine epoxy curing agent, the viscosity is less than 10 Pa.s, the solid content is 40%, and the pH value is 11-13.
3. The corrosion-resistant thermally conductive coating of claim 1, wherein the diluent is deionized water; the leveling agent is Efka3570 or Efka 3580; the antifoaming agent is Efka2560, Efka2570 or Efka 2580.
4. The corrosion-resistant heat-conducting coating material as claimed in claim 1, wherein the fluorinated graphene oxide has a fluorine-carbon ratio of 0.8 to 1.1 and a particle size of 4 to 10 μm.
5. The corrosion-resistant heat-conducting coating as claimed in claim 1, wherein the concentration of hydrogen peroxide is 30%; the mass ratio of the boron nitride to the hydrogen peroxide is 1: 50-150.
6. The corrosion-resistant heat-conducting coating material of claim 1, wherein the mass ratio of the boron hydroxy nitride to the deionized water is 1: 200-500.
7. The corrosion-resistant heat-conducting coating material according to claim 1, wherein the carboxylic phthalocyanine is tetracarboxylic zinc phthalocyanine, tetracarboxylic cobalt phthalocyanine or tetracarboxylic iron phthalocyanine.
8. The corrosion-resistant heat-conducting coating material as claimed in claim 1, wherein the mass ratio of the hydroxyl boron nitride to the carboxylic acid phthalocyanine is 1: 1-1.5.
9. A preparation method of the corrosion-resistant heat-conducting coating as claimed in any one of claims 1 to 8, characterized by comprising the following steps: weighing raw materials according to a formula, mixing the aqueous film-forming resin, the carboxylic acid modified boron nitride, the fluorinated graphene oxide, the diluent, the flatting agent and the defoaming agent, fully dispersing, filtering to obtain a mixed solution, and adding the curing agent into the mixed solution for fully mixing to obtain the corrosion-resistant heat-conducting coating.
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| CN104817930A (en) * | 2015-05-05 | 2015-08-05 | 济宁利特纳米技术有限责任公司 | Heat-conductive and anti-corrosion coating based on graphene functional material and preparation method of same |
| CN106336759A (en) * | 2016-08-24 | 2017-01-18 | 上海颐行高分子材料有限公司 | Aqueous acrylate heat-conduction coating material and preparation method thereof |
| CN106366710B (en) * | 2016-09-12 | 2018-11-06 | 中国航空工业集团公司北京航空材料研究院 | A kind of graphene heat conduction anticorrosion water-soluble coating and its preparation and application |
| CN107987720A (en) * | 2017-11-02 | 2018-05-04 | 广东华材实业股份有限公司 | A kind of high temperature resistant anti-corrosive organic coatings and preparation method thereof |
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2019
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