CN104163928A - Conductive heat-conductive graphene slurry and coating - Google Patents
Conductive heat-conductive graphene slurry and coating Download PDFInfo
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- CN104163928A CN104163928A CN201410422381.2A CN201410422381A CN104163928A CN 104163928 A CN104163928 A CN 104163928A CN 201410422381 A CN201410422381 A CN 201410422381A CN 104163928 A CN104163928 A CN 104163928A
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Abstract
The invention relates to a conductive heat-conductive graphene slurry and a coating. The conductive heat-conductive graphene slurry comprises the following raw materials: 0.1-90wt% of conductive heat-conductive graphene slurry ( consisting of 3-20wt% of less graphene, 0-80wt% of base solvent, 0-80wt% of base resin), 0-60wt% of filler, 0-10% of dispersing agent, 10-60wt% of resin, 10-60wt% of curing agent, and 30-70wt% of solvent, wherein not only can the graphene slurry be antistatic, conductive and heat-conducting despite of less addition amount, but also the surface of a coated article is smoother and finer, firmer and more durable; compared with the addition amount of the existing conductive material, the conductive heat-conductive graphene slurry is lower in addition amount and can also reach lower resistivity.
Description
Technical field
The invention belongs to material technology field, be specifically related to a kind of conductive and heat-conductive Graphene slurry and coating.
Background technology
Conductive and heat-conductive coating is a kind of functional materials occurring along with the high speed development of coatings industry and modern industry in recent years, refer to and be applied on non-conductive or heat conduction ground, make it to have the coating of certain conduction current and dissipation static charge, it becomes film base material generally to insulate.In order to make coating have conduction, heat conductivility, conventional method is to add conduction, conductive particles.Conduction, heat-conductive coating is in electronic industry, automotive industry, and Sweet natural gas and oil product storage and transportation, the aspects such as aerospace all have important practical value.
Conductive carbon black, graphite, Conductive mica, metal (gold and silver, copper, nickel), carbon fiber are conventional conductive, the thermally conductive material that current electrically conducting coating main flow is used, carbon class material has the characteristics such as the good and particle of chemical stability is little, can effectively fill up the space in pole piece and form conductive network, but, because carbon black is that amorphous spherical carbon structure and aspect ratio are low, although cause it to form conductive network but socket is point-to-point contact, so resistance value is height compared to graphite; Graphite is the electro-conductive material that another kind of main flow is used, and the same with carbon black have good chemical stability, but its particle size is not high much larger than carbon black and aspect ratio yet, and therefore under identical addition, more difficult formation is as the complete conductive network as carbon black; In industry such as electronics, LED, sun power, the electro-conductive material that main flow is used is metal (gold and silver, copper, nickel) material, and its conduction, heat conductivility are better than carbon material, but poor chemical stability (copper, nickel), and expensive (gold and silver); Carbon nanotube and carbon nano fiber are more novel electro-conductive material, have the resistance value lower than graphite, the aspect ratio higher than graphite, should there is best conductivity in theory, yet the shortcomings such as its difficulty is disperseed, purity is low, metallic pollution, price height, greatly improve degree of difficulty in actual use, become this type of electro-conductive material and fail a large amount of universal reasons.
Summary of the invention
In order to address the above problem, the object of the invention is to, a kind of conductive and heat-conductive Graphene slurry is provided.
Two of object of the present invention is to provide the coating that comprises described conductive and heat-conductive Graphene slurry.
The present invention is achieved through the following technical solutions:
A conductive and heat-conductive Graphene slurry, this slurry is comprised of few layer graphene 3～20wt%, base solvent 0～80wt% and base resin 0～80wt%; Described few layer graphene thickness is below 20nm, and described few layer graphene radius-thickness ratio is at least 100～100000:1.Few layer graphene thickness is below 20nm, and preferred thickness is below 10nm, and preferred thickness is below 5nm, and most preferred thickness is below 1nm; Radius-thickness ratio is at least 100:1, and preferred radius-thickness ratio is at least 1000:1, and preferred radius-thickness ratio is at least 10000:1, and most preferred radius-thickness ratio is at least 100000:1.
Preferably, described base resin is the one or more combination thing in epoxy resin, urethane resin, carbamide resin, acrylic resin, Synolac, silicone resin, chlorinated resin, furane resin, polyester resin.
Preferably, described base solvent one or more mixtures in ester, pentyl acetate, Isoamyl Acetate FCC, isoamyl acetate, lacquer thinner, Tianna solution, lacquer thinners that have been water, Virahol, ethanol, acetone, butanone, epoxy active diluent, N-Methyl pyrrolidone, dimethyl formamide, dimethyl sulfoxide (DMSO), dimethylbenzene, benzene, aromatic solvent naphtha, ethyl acetate, acetic acid.
A conductive and heat-conductive coating, comprises conductive and heat-conductive Graphene slurry 0.1～90wt%, filler 0～60wt%, dispersion agent 0～10wt%, resin 10～60wt%, solidifying agent 10～60wt%, solvent 30～70wt%.
Described filler is the one or more combination thing in calcium carbonate, talcum powder, wollastonite, vermiculite, titanium dioxide, barium sulfate, diatomite, kaolin, wilkinite, mica.
Described resin is the one or more combination thing in epoxy resin, urethane resin, carbamide resin, acrylic resin, Synolac, silicone resin, chlorinated resin, furane resin, polyester resin.
Wherein epoxy resin is one or more mixtures in bisphenol A type epoxy resin, bisphenol f type epoxy resin, polyphenol type tetraglycidel ether epoxy resin, aliphatic glycidyl ether epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, heterocyclic type and mixed type epoxy resin etc.
Described solidifying agent is one or more mixtures in aliphatics brothers amine, aliphatic tertiary amine, primary aromatic amine, aromatic nitrile base, aliphatic cyclic amine, modified amine, mixed amine, Versamid, acid anhydrides, modified anhydride, imidazoles, modified imidazole, inorganic salt, complex compound, TDI tripolymer, TDI/TMP affixture, TDI/ alkyd affixture, isocyanic ester, pyridine, aminoresin, tetraisopropoxy titanium, HDI, TDI.
Described solvent one or more mixtures in ester, pentyl acetate, Isoamyl Acetate FCC, isoamyl acetate, lacquer thinner, Tianna solution, lacquer thinners that have been water, Virahol, ethanol, acetone, butanone, epoxy active diluent, N-Methyl pyrrolidone, dimethyl formamide, dimethyl sulfoxide (DMSO), dimethylbenzene, benzene, ethyl acetate, acetic acid.
For the ease of processing, described conductive and heat-conductive coating also comprises processing aid, and processing aid is one or more the mixture in flow agent, coupling agent, defoamer.
Wherein, described flow agent comprises one or more mixing of the agent of vinylformic acid levelling, modified acroleic acid flow agent, organosilicon flow agent, fluorocarbon class flow agent.
Described organosilicon flow agent comprises one or more mixing of polydimethylsiloxane, poly-methyl alkyl siloxane, organic modified polyorganosiloxane.
Described coupling agent comprises one or more mixing of silane coupling agent, titanate coupling agent, aluminate coupling agent, bimetal coupling agent, xylogen coupling agent, tin coupling agent, phosphate coupling agent.
Described defoamer comprises one or more mixing such as natural fats and oils, higher alcohols, polyethers defoamer, silicon defoamer, polyether-modified silicon defoamer.
Conductive and heat-conductive Graphene slurry in the present invention, is comprised of few layer graphene, base solvent and base resin; Described few layer graphene thickness is below 20nm, and described few layer graphene radius-thickness ratio is at least 100～100000:1.The coating that itself and filler, dispersion agent, resin, solidifying agent and solvent are prepared, can apply and need conduction, heat conduction or antistatic and in conjunction with the multifunctional coating of the performance such as anticorrosive, anti-oxidant, wear-resistant; Also can be applicable to printed electronic circuit, electron device, radio-frequency devices, antenna, touch-screen, sun power electrode etc.; Also can be applicable to the heat radiation of LED, chip and industrial equipments etc.
Graphene is two-dimensional sheet carbon nanomaterial, is the essential structure of graphite and carbon nanotube, and its super excellent physicals has allowed Graphene become the super active material in this century.Single-layer graphene has up to 2630m
2the theoretical surface of/g is long-pending with 10
-6the theoretical resistivity of ohm.cm, and the high advantage of radius-thickness ratio (aspect ratio).As shown in Figure 1, the face way of contact of Graphene uniqueness contacts with the point of conductive carbon black, and the line way of contact of carbon nanotube by comparison, more can effectively reduce contact resistance, makes take Graphene to have ultralow resistivity as the formed conductive network of conductive agent.
Above-mentioned few layer graphene is added to epoxy resin, in the general coating base material such as urethane resin, and be equipped with suitable auxiliary agent, through processing, obtain few layer graphene conduction, heat-conductive coating.This coating has with conduction energy like metal species and is better than silver-colored heat conductivility.
The present invention compares with traditional electrically conducting coating additive, and the addition of graphite slurry is few, applies the rear cast that substantially do not have.Such as the antistatic coating for petroleum storage tank and pipeline, can reduce like this that conducting objects comes off and pollution to oil product.For floor paint etc., the more smooth exquisiteness in surface.Because this conductive agent addition is few, resin content is high relatively, and overall adhesion increases.Grapheme material itself also has enhancement, time whole coating system more sturdy and durable.The present invention also has high radius-thickness ratio and conductivity, the prepared few layer graphene of the present invention has superelevation radius-thickness ratio, for main flow conductive additive is as tens of extremely thousands of times of conductive carbon black or graphite, so more easily form conduction networking, when than the lower addition of conductive carbon black, just can reach lower resistivity.
Accompanying drawing explanation
Fig. 1 is the graphic representation between Graphene content and film coated surface resistivity in embodiment 1,
Fig. 2 is the graphic representation between Graphene content and film coated surface resistivity in embodiment 2,
Fig. 3 is the graphic representation between Graphene content and film coated surface resistivity in embodiment 3.
concrete embodiment
Below in conjunction with embodiment, the present invention is described in further detail, to help those skilled in the art, understands the present invention.
Embodiment 1
Conductive and heat-conductive Graphene slurry and a coating thereof, be prepared as follows:
Get few layer graphene: 5.3g, epoxy resin E51:50.0g, organic solvent: 50.0g makes conductive and heat-conductive Graphene slurry after high-speed mixing, stirring, cleavage, standby.
Get respectively above-mentioned Graphene slurry: 12.8g, 25.0g, 37.5g, 50g; E51 epoxy resin: 50.0g, 45g, 42g, 38g; Solidifying agent EN125:50g, 45g, 42g, 38g; Talcum powder: 20g; Flow agent: 0.1g; Coupling agent: 0.1g; Organic solvent is appropriate; High-speed mixing evenly makes conductive and heat-conductive coating.
Coating is applied, treat dried coating film, test resistance rate (seeing Fig. 1).
Embodiment 2
Conductive and heat-conductive Graphene slurry and a coating thereof, be prepared as follows:
Get few layer graphene: 5.3g; Polyester polyol 1200:50.0g; Organic solvent: 50.0g; After high-speed mixing, stirring, cleavage, make conductive and heat-conductive Graphene slurry, standby.
Get respectively above-mentioned few layer graphene slurry: 2.8g, 25.0g, 37.5g, 50g; Polyester polyol 1200:50.0g, 45g, 42g, 38g; Solidifying agent N3390:50g, 45g, 42g, 38g; Talcum powder: 20g; Flow agent: 0.1g; Coupling agent: 0.1g; The appropriate high-speed mixing of organic solvent evenly makes conductive and heat-conductive coating.
Coating is applied, treat dried coating film, test resistance rate (seeing Fig. 2).
Embodiment 3
Conductive and heat-conductive Graphene slurry and a coating thereof, be prepared as follows:
Get few layer graphene: 5.3g; Hydroxyl acrylic A160:50.0g; Organic solvent: 50.0g makes conductive and heat-conductive Graphene slurry after high-speed mixing stirring, cleavage, standby.
Get respectively above-mentioned slurry: 12.8g, 25.0g, 37.5g, 50g; Hydroxy acrylate A160:83.3g, 75g, 70g, 63.3g; Solidifying agent N3390:50g, 45g, 42g, 38g; Talcum powder: 20g; Flow agent: 0.1g; Coupling agent: 0.1g; Organic solvent: appropriate; High-speed mixing is even; High-speed mixing evenly makes conductive and heat-conductive coating.
Coating is applied, treat dried coating film, test resistance rate (seeing Fig. 3).
Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with the feature described in the claims in the present invention and principle therefore all changes or modifies, within all should being included in the claims in the present invention scope.
Claims (10)
1. a conductive and heat-conductive Graphene slurry, is characterized in that, this slurry is comprised of few layer graphene 3～20wt%, base solvent 0～80wt% and base resin 0～80wt%; Described few layer graphene thickness is below 20nm, and described few layer graphene radius-thickness ratio is at least 100～100000:1.
2. conductive and heat-conductive Graphene slurry as claimed in claim 1, it is characterized in that, described base resin is the one or more combination thing in epoxy resin, urethane resin, carbamide resin, acrylic resin, Synolac, silicone resin, chlorinated resin, furane resin, polyester resin.
3. conductive and heat-conductive Graphene slurry as claimed in claim 1, it is characterized in that described base solvent one or more mixtures in ester, pentyl acetate, Isoamyl Acetate FCC, isoamyl acetate, lacquer thinner, Tianna solution, lacquer thinners that have been water, Virahol, ethanol, acetone, butanone, epoxy active diluent, N-Methyl pyrrolidone, dimethyl formamide, dimethyl sulfoxide (DMSO), dimethylbenzene, benzene, aromatic solvent naphtha, ethyl acetate, acetic acid.
4. a conductive and heat-conductive coating, is characterized in that, comprises conductive and heat-conductive Graphene slurry 0.1～90wt%, filler 0～60wt%, dispersion agent 0～10wt%, resin 10～60wt%, solidifying agent 10～60wt%, solvent 30～70wt%; Wherein, described conductive and heat-conductive Graphene slurry is the conductive and heat-conductive Graphene slurry described in any one in claim 1-3.
5. conductive and heat-conductive coating as claimed in claim 4, is characterized in that, described filler is the one or more combination thing in calcium carbonate, talcum powder, wollastonite, vermiculite, titanium dioxide, barium sulfate, diatomite, kaolin, wilkinite, mica.
6. conductive and heat-conductive coating as claimed in claim 4, it is characterized in that, described resin is the one or more combination thing in epoxy resin, urethane resin, carbamide resin, acrylic resin, Synolac, silicone resin, chlorinated resin, furane resin, polyester resin.
7. conductive and heat-conductive coating as claimed in claim 4, it is characterized in that, described solidifying agent is one or more mixtures in aliphatics brothers amine, aliphatic tertiary amine, primary aromatic amine, aromatic nitrile base, aliphatic cyclic amine, modified amine, mixed amine, Versamid, acid anhydrides, modified anhydride, imidazoles, modified imidazole, inorganic salt, complex compound, TDI tripolymer, TDI/TMP affixture, TDI/ alkyd affixture, isocyanic ester, pyridine, aminoresin, tetraisopropoxy titanium, HDI, TDI.
8. conductive and heat-conductive coating as claimed in claim 4, it is characterized in that described solvent one or more mixtures in ester, pentyl acetate, Isoamyl Acetate FCC, isoamyl acetate, lacquer thinner, Tianna solution, lacquer thinners that have been water, Virahol, ethanol, acetone, butanone, epoxy active diluent, N-Methyl pyrrolidone, dimethyl formamide, dimethyl sulfoxide (DMSO), dimethylbenzene, benzene, ethyl acetate, acetic acid.
9. conductive and heat-conductive coating as claimed in claim 4, is characterized in that, also comprises processing aid.
10. conductive and heat-conductive coating as claimed in claim 9, is characterized in that, described processing aid is one or more the mixture in flow agent, coupling agent, defoamer.
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