CN107556866A - A kind of graphene-based scumbling high efficiency and heat radiation coating and preparation method thereof - Google Patents

Abstract

The invention discloses a graphene-based thin coating high-efficiency heat dissipation coating, which comprises the following raw materials in parts by weight: 0.3-3 single-layer graphene, 30-70 main resin, 3-20 film-forming aids, and 0.1-1 dispersant , defoamer 0.1-1, coupling agent 0.1-1, inorganic filler 3-30, water-based diluent 5-20. The invention adopts nano-graphene with high thermal conductivity, and can still maintain good hiding power through thinly applied heat-dissipating coatings, which can significantly improve the adhesion of paint films, improve thermal conductivity, and emit no irritating odor from water-based solvents, and can significantly reduce VOC emissions , has a good environmental protection effect and is durable.

Description

A kind of graphene-based thin coating high-efficiency heat dissipation coating and preparation method thereof

technical field

The invention relates to the field of heat-dissipating paint, in particular to a graphene-based thin-coated high-efficiency heat-dissipating paint and a preparation method thereof.

Background technique

In recent years, with the advancement of industrial technology, the requirements for the service life of electronic equipment have become increasingly stringent, and the efficient heat dissipation of electronic equipment is one of the important factors affecting its service life, especially the heat dissipation of precision electronic devices has caused more and more Much attention. Traditional heat dissipation methods include heat conduction, heat radiation, and heat convection. Heat conduction is especially critical in small spaces. Most traditional coatings do not have heat dissipation functions, or have low heat dissipation efficiency. Improved thermal conductivity will greatly increase the performance and service life of electronic devices.

Traditional thermal conductive coatings include silicone resin, epoxy resin, phenolic resin, acrylic acid, polyurethane and other additives, such as: aluminum oxide, magnesium oxide, boron nitride, beryllium oxide and other inorganic fillers, which have good thermal conductivity, but most require Apply thickly to about 100μm. As a new type of thermal conductive material, graphene has good thermal conductivity and excellent chemical stability, and its small particles and strong hiding power have attracted widespread attention. Therefore, it is particularly important to develop graphene-based thin-coated heat-dissipating coatings with high heat dissipation efficiency.

Contents of the invention

In order to make up for the deficiencies of the prior art, the present invention provides a graphene-based thin-coated high-efficiency heat dissipation coating and a preparation method thereof, which have the characteristics of water solubility, thin coating, and high-efficiency heat dissipation.

The present invention is achieved through the following technical solutions:

A graphene-based thin-coating high-efficiency heat dissipation coating, which is special in that it includes the following raw materials in parts by weight: 0.3-3 single-layer graphene, 30-70 main resin, 3-20 film-forming aids, and 0.1 dispersant -1, defoamer 0.1-1, coupling agent 0.1-1, inorganic filler 3-30, water-based diluent 5-20; the main resin is a mixture of acrylic emulsion and silicone modified resin, acrylic emulsion and organic The mass ratio of silicon-modified resin is (20-40): (10-30); the viscosity of the main resin makes the coating more stable and firm, and the mixture of acrylic emulsion and silicone-modified resin is a good heat-conducting coating.

Preferably, the film-forming aids include one or more of ethylene glycol, glycerol, propylene glycol butyl ether, and lauryl alcohol ester; It can change the surface tension of the coating to make it have good adhesion.

The graphene-based thin-coated high-efficiency heat dissipation coating of the present invention also includes an organosiloxane leveling agent.

Further, the organosiloxane leveling agent is BYK370-375.

Preferably, the dispersant is BYK180-185; the coupling agent is KH560, and graphene has better dispersion in KH560, which is conducive to uniform heat dissipation of the material.

Preferably, the defoamer includes a silicone defoamer and a polyether defoamer, wherein the silicone defoamer is BYK021-027, and the polyether defoamer is BYK011.

Preferably, the thickness of the single-layer graphene is less than 10nm, and the diameter-to-thickness ratio is greater than 1000:1, and the thickness of the graphene and the diameter-to-thickness ratio can seriously affect its dispersion effect in the coating. Under this selection, graphene can be compared with Good dispersion in resin and other additives.

Preferably, the inorganic filler is one or a mixture of beryllium oxide, boron nitride, aluminum powder, barium sulfate, and diatomaceous earth, all of which have good thermal conductivity of inorganic materials.

Preferably, the aqueous diluent is a mixed solvent of one or more of water, ethanol, isopropanol, N-methylpyrrolidone, and epoxy reactive diluent; the epoxy reactive diluent is carbon twelve to myristyl glycidyl ether; disperse graphene in aqueous solvents to avoid the use of benzene organic solvents and reduce the use of toxic substances.

A kind of preparation method of graphene-based thin coating high-efficiency heat dissipation coating of the present invention, comprises the following steps:

(1) Mix the main resin with dispersant and defoamer, and disperse it mechanically for 10-20 minutes to obtain component A;

(2) Add inorganic fillers to component A, and mechanically disperse for 10-20 minutes to obtain component B;

(3) Mixing graphene with water-based diluent, coupling agent and film-forming aid and ultrasonically dispersing for 1-3 hours to prepare graphene slurry to obtain component C;

(4) Add component C to component B, disperse evenly, and filter out.

The beneficial effects of the present invention are: the present invention adopts nano-graphene with high thermal conductivity, can still maintain good hiding power through thinly applied heat-dissipating paint, can significantly improve paint film adhesion, enhance thermal conductivity, and the water-based solvent has no irritating smell emissions, can significantly reduce VOC emissions, has a good environmental protection effect, and is durable.

Description of drawings

Accompanying drawing 1 is the thermal radiation efficiency contrast figure of the heat radiation coating of spraying different thickness in embodiment 1;

Accompanying drawing 2 is the thermal radiation efficiency contrast figure of the heat radiation coating of spraying different thickness in embodiment 2;

Accompanying drawing 3 is the comparison diagram of the heat-dissipating paint film of spraying different thickness in embodiment 1.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present invention. The protection scope of the present invention includes but is not limited to In the following examples, without departing from the spirit and scope of the present application, any modifications made to the details and forms of the technical solutions of the present invention fall within the protection scope of the present invention.

Example 1

The graphene-based thin coating high-efficiency heat dissipation coating in this embodiment includes the following raw materials in weight percentage: 20% of acrylic emulsion, 30% of silicone modified epoxy resin, 0.7% of dispersant (BYK180-185), and defoamer (BYK021 -027, BYK011) 0.8%, beryllium oxide 15%, aluminum powder 3%, single-layer graphene 1%, KH560 0.1%, N-methylpyrrolidone 2.5%, ethylene glycol 18%, water 8.9%.

The preparation method of the graphene-based thin-coated high-efficiency heat dissipation coating comprises the following steps:

(1) Mix acrylic emulsion, silicone-modified epoxy resin, dispersant and defoamer, and mechanically disperse at 400-1000 rpm for 10-20 minutes to obtain component A;

(2) Add beryllium oxide and aluminum powder to component A, and continue to mechanically disperse at 600-1500 rpm for 10-20 minutes to obtain component B;

(3) Ultrasonic dispersion of single-layer graphene with KH560, N-methylpyrrolidone, ethylene glycol, and water for 2 hours to prepare graphene slurry to obtain component C;

(4) Add component C to component B, continue to disperse at high speed for 1 hour, more than 1000 rpm, add water, adjust viscosity and filter out.

Test experiment: Spray the paint on the tinplate, respectively coat 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, measure the heat radiation efficiency, and compare it with the blank experiment. The results are shown in Figure 1. Paints with different coating thicknesses The film picture is shown in Figure 3; the coating film is 30 μm, surface dry for 3-5 minutes, cured at 105°C for 2 hours, cured at room temperature for 24 hours, tested for salt spray resistance > 96 hours, adhesion > level 1, hardness 4H, and thermal conductivity increased by 503 %.

Example 2

The graphene-based thin coating high-efficiency heat dissipation coating of this embodiment includes the following raw materials in weight percentage: 30% of acrylic emulsion, 20% of silicone modified epoxy resin, 0.7% of dispersant, 0.8% of defoamer, and 10% of beryllium oxide , aluminum powder 5%, single-layer graphene 1.2%, KH560 0.1%, N-methylpyrrolidone 2.5%, ethylene glycol 18%, water 11.7%.

The preparation method of the graphene-based thin-coated high-efficiency heat dissipation coating comprises the following steps:

(1) Mix acrylic emulsion, silicone-modified epoxy resin, dispersant and defoamer, and mechanically disperse at 400-1000 rpm for 10-20 minutes to obtain component A;

(2) Add beryllium oxide and aluminum powder to component A, and continue to mechanically disperse at 600-1500 rpm for 10-20 minutes to obtain component B;

(3) Ultrasonic dispersion of single-layer graphene with KH560, N-methylpyrrolidone, ethylene glycol, and water for 2 hours to prepare graphene slurry to obtain component C;

(4) Add component C to component B, continue to disperse at high speed for 1 hour, more than 1000 rpm, add water, adjust viscosity and filter out.

Test experiment: Spray the paint on the tinplate, and coat the films of 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, and 70 μm respectively, measure the heat radiation efficiency, and compare it with the blank experiment. The results are shown in Figure 1; Dry for 3-5 minutes, cure at 105°C for 2 hours, cure at room temperature for 24 hours, test salt spray resistance >96 hours, adhesion >1 grade, hardness 4H, heat conduction efficiency increased by 423%.

Claims (10)

1. A kind of 1. graphene-based scumbling high efficiency and heat radiation coating, it is characterised in that：Include the raw material of following parts by weight：Mono-layer graphite Dilute 0.3-3, matrix resin 30-70, coalescents 3-20, dispersant 0.1-1, defoamer 0.1-1, coupling agent 0.1-1 are inorganic to fill out Expect 3-30, aqueous diluent 5-20；The matrix resin is the mixture of acrylic emulsion and organic-silicon-modified resin, acrylic acid Emulsion and the mass ratio of organic-silicon-modified resin are（20-40）：（10-30）.
2. A kind of 2. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The coalescents Including the one or more in ethylene glycol, glycerine, propandiol butyl ether, lauryl alcohol ester.
3. A kind of 3. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：Also include organosilicon Oxygen alkane levelling agent.
4. A kind of 4. graphene-based scumbling high efficiency and heat radiation coating according to claim 3, it is characterised in that：Organic silica Alkane levelling agent is BYK370-375.
5. A kind of 5. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The dispersant is BYK180-185；The coupling agent is KH560.
6. A kind of 6. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The defoamer bag Organic silicon defoamer and polyether antifoam agent are included, wherein, organic silicon defoamer BYK021-027, polyether antifoam agent BYK011.
7. A kind of 7. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The mono-layer graphite The thickness of alkene is less than 10nm, and radius-thickness ratio is more than 1000:1.
8. A kind of 8. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The inorganic filler For one or more of mixtures in beryllium oxide, boron nitride, aluminium powder, barium sulfate, diatomite.
9. A kind of 9. graphene-based scumbling high efficiency and heat radiation coating according to claim 1, it is characterised in that：The water-based dilution Agent is one or more of mixed solvents in water, ethanol, isopropanol, 1-METHYLPYRROLIDONE, epoxy active diluent；It is described Epoxy active diluent is carbon 12 to myristyl glycidol ether.
10. 10. a kind of preparation method of graphene-based scumbling high efficiency and heat radiation coating according to any one of claim 1-8, its It is characterised by：Comprise the following steps：

    Matrix resin is mixed with dispersant, defoamer, mechanical dispersion 10-20min, obtains component A；

    Inorganic filler is added into component A, mechanical dispersion 10-20min, obtains component B；

    Graphene slurry is made with aqueous diluent, coupling agent and coalescents mixing ultrasonic disperse 1-3h in graphene, obtains group Divide C；

    Component C is added in component B, is uniformly dispersed, filtering and discharging.