CN112457758A - Graphene slurry, electrothermal coating and electrothermal film prepared from graphene slurry, and application of electrothermal coating and electrothermal film in electrothermal heating - Google Patents
Graphene slurry, electrothermal coating and electrothermal film prepared from graphene slurry, and application of electrothermal coating and electrothermal film in electrothermal heating Download PDFInfo
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- CN112457758A CN112457758A CN202011354098.2A CN202011354098A CN112457758A CN 112457758 A CN112457758 A CN 112457758A CN 202011354098 A CN202011354098 A CN 202011354098A CN 112457758 A CN112457758 A CN 112457758A
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
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- C—CHEMISTRY; METALLURGY
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
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- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
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Abstract
The invention provides graphene slurry, an electrothermal coating and an electrothermal film prepared from the graphene slurry, and application of the electrothermal coating and the electrothermal film in electrothermal heating, and relates to the technical field of electrothermal materials. The graphene slurry is mainly prepared from expanded graphite and a cellulose derivative, wherein graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene, and has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm. The electrothermal coating comprises the graphene slurry, aqueous polymer resin, silica sol, an aqueous wetting dispersant, an inorganic filler, an auxiliary agent and water, and has the advantages of good flexibility, good temperature resistance and heat resistance and strong conductivity.
Description
Technical Field
The invention relates to the technical field of electric heating materials, in particular to graphene slurry, an electric heating coating prepared from the graphene slurry, an electric heating film and application of the electric heating coating and the electric heating film in electric heating.
Background
The graphene is a perfect quasi-two-dimensional crystal material completely composed of SP2 hybridized carbon atoms, and has excellent electric heating properties such as high electric conductivity and high heat conductivity. Particularly, the graphene electrothermal coating has the characteristics of environmental protection, high heat conversion efficiency, far infrared physiotherapy and the like, so that the graphene electrothermal coating can be widely applied to modern household heating and coal-to-electricity engineering. The water-based electrothermal coating is a coating developed and improved aiming at the solvent-based electrothermal coating widely used in the field of electric heating at present. The solvent type electrothermal paint contains a lot of organic solvents, most of which have bad smell and even can generate toxicity to human bodies, thus causing great pressure on enterprises in the aspects of environmental protection and waste treatment. The water-based paint is an environment-friendly auxiliary agent which is nontoxic and harmless to the environment and human bodies, and the water-based paint is bound to gradually replace a solvent type electric heating paint.
The existing graphene electrothermal coating is generally composed of organic polymer resin, graphene, an organic solvent and an oily auxiliary agent, such as xylene, ethylene glycol monobutyl ether, acetone and the like, and is relatively harmful to the environment and even not beneficial to human health. The coating mode is generally printing, has higher requirement on the fineness of the coating, can be produced only by grinding, and has more complex process and higher energy consumption. And the used graphene has uneven quality level and larger difference of conductivity, and is often mixed with other conductive fillers such as carbon nanotubes, carbon black and the like for use, so that the excellent characteristics of the graphene cannot be completely reflected.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an electrothermal coating and an electrothermal film coated with the electrothermal coating, wherein the electrothermal coating and the electrothermal film have the characteristics of good flexibility, temperature resistance and heat resistance, and excellent electrothermal performance.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the graphene slurry provided by the invention is mainly prepared from expanded graphite and a cellulose derivative;
the graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene, and has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm.
Further, the expansion multiplying power range of the expanded graphite is 200-800 times, preferably 300-600 times, and further preferably 400-500 times;
preferably, the cellulose derivative comprises at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose;
more preferably, the cellulose derivative comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose;
preferably, the mass ratio of the expanded graphite to the cellulose derivative is 5-30: 1, preferably 10-20: 1, more preferably 15: 1.
The invention provides a preparation method of the graphene slurry, which comprises the following steps:
dissolving a cellulose derivative in a solvent to obtain a cellulose derivative solution; then adding expanded graphite and mixing uniformly to obtain expanded graphite dispersion liquid; then, carrying out high-pressure homogenization treatment on the expanded graphite dispersion liquid to obtain graphene slurry;
preferably, the solvent is deionized water;
preferably, the concentration of the cellulose derivative solution is 0.1-0.3 wt%;
preferably, the method for adding the expanded graphite is a mode of stirring while adding;
preferably, the pressure of the high-pressure homogenizing treatment is 100-240 MPa, preferably 180-220 MPa;
preferably, the time of the high-pressure homogenization treatment is 1-10 min, and preferably 3 min.
The invention provides an application of the graphene slurry in preparing an electrothermal coating.
The invention provides an electrothermal coating, which comprises the following raw materials: the graphene slurry, the aqueous polymer resin, the silica sol, the aqueous wetting dispersant, the inorganic filler, the auxiliary agent and water;
preferably, the auxiliaries include film-forming auxiliaries, thickeners, defoamers and leveling agents;
preferably, the water is deionized water;
preferably, the electrothermal coating comprises the following raw materials in percentage by mass: 10-50 wt% of graphene slurry, 5-30 wt% of water-based polymer resin, 5-20 wt% of silica sol, 0.1-1 wt% of water-based wetting dispersant, 5-20 wt% of inorganic filler, 0.1-2 wt% of film-forming assistant, 0.1-1 wt% of thickener, 0.1-1 wt% of defoamer, 0.1-2 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100%;
preferably, the electrothermal coating comprises the following raw materials in percentage by mass: 15-45 wt% of graphene slurry, 8-28 wt% of water-based polymer resin, 8-18 wt% of silica sol, 0.2-0.8 wt% of water-based wetting dispersant, 8-18 wt% of inorganic filler, 0.2-1.5 wt% of film-forming assistant, 0.2-0.8 wt% of thickening agent, 0.2-0.8 wt% of defoaming agent, 0.5-1.5 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100%;
preferably, the electrothermal coating comprises the following raw materials in percentage by mass: 20-40 wt% of graphene slurry, 10-25 wt% of water-based polymer resin, 10-15 wt% of silica sol, 0.4-0.6 wt% of water-based wetting dispersant, 10-15 wt% of inorganic filler, 0.5-1 wt% of film-forming assistant, 0.3-0.6 wt% of thickener, 0.3-0.6 wt% of defoaming agent, 0.8-1.2 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100%.
Further, the aqueous polymer resin comprises at least one of aqueous polyurethane resin, aqueous acrylic resin, aqueous epoxy resin, aqueous vinyl chloride-vinyl acetate resin, aqueous polyurethane modified epoxy resin and aqueous polyurethane modified acrylic resin;
preferably, the silica sol comprises at least one of neutral silica sol ZS-30 and alkaline silica sol JS-30;
preferably, the aqueous wetting dispersant comprises at least one of the product models Tilo-6002, KYC-9366, HH-2018 and AMORSO-7517B, preferably a pigment-philic group block copolymer of the model AMORSO-7517B;
preferably, the inorganic filler comprises at least one of mica powder, silica micropowder, talcum powder, barite powder, coarse whiting powder and kaolin;
more optionally, the particle size of the inorganic filler is 1-13 μm;
preferably, the film forming aid comprises at least one of propylene glycol ethyl ether, propylene glycol butyl ether, hexylene glycol butyl ether acetate and dodecyl alcohol ester, preferably dodecyl alcohol ester;
preferably, the thickener comprises at least one of product models DN-2002, DN-2005, DN-2006 and DN-2009;
preferably, the defoaming agent comprises at least one of product types B-227, B-227 and B-227;
preferably, the leveling agent comprises at least one of AMORSO-189T and AMORSO-185T.
The invention provides a preparation method of the electrothermal coating, which comprises the following steps:
uniformly mixing the raw materials to obtain the electrothermal coating;
preferably, the preparation method comprises the following steps:
uniformly mixing other raw materials except the graphene slurry and the inorganic filler to obtain mixed slurry A; then adding the graphene slurry into the mixed slurry A and uniformly mixing to obtain mixed slurry B; and then adding an inorganic filler into the mixed slurry B and uniformly mixing to obtain the electrothermal coating.
The electrothermal film provided by the invention is mainly prepared by coating the electrothermal coating on a film-forming carrier;
preferably, the film-forming carrier comprises one of polyimide film, non-woven fabric, polyethylene film and polyester film, preferably polyester film;
preferably, the coating means comprises roll coating or knife coating, preferably knife coating.
The invention provides the electric heating coating or the application of the electric heating film in electric heating.
The invention provides an electric heating device, which comprises the electric heating film;
or the electric heating device is coated with the electric heating paint.
Compared with the prior art, the invention has the beneficial effects that:
the graphene slurry provided by the invention is mainly prepared from expanded graphite and a cellulose derivative, wherein graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene, and the graphene slurry has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm. The graphene slurry is prepared by taking 400-500 times of expanded graphite as a raw material and stripping the expanded graphite through a high-pressure homogenizing device by adopting a diamond interaction correlation homogenizing technology, so that the graphene slurry has the characteristics of thin sheet layer, uniform size and excellent conductivity, and simultaneously, graphene in the graphene slurry has a typical two-dimensional structure, the layer is flat, the defects are few, phonon movement is facilitated, the heat conductivity is excellent, a film is easily formed, and the far infrared radiation characteristic of the graphene can be perfectly embodied.
The preparation method of the graphene slurry provided by the invention comprises the steps of dissolving a cellulose derivative in a solvent to obtain a cellulose derivative solution; then adding expanded graphite and mixing uniformly to obtain expanded graphite dispersion liquid; then, carrying out high-pressure homogenization treatment on the expanded graphite dispersion liquid to obtain graphene slurry; the preparation method has the advantages of simple production process and easy operation.
The graphene slurry provided by the invention can be widely applied to the preparation process of the electric heating coating.
The electrothermal coating provided by the invention comprises the graphene slurry, water-based high polymer resin, silica sol, a water-based wetting dispersant, an inorganic filler, an auxiliary agent and water; wherein: the graphene slurry is used as a heating core, the water-based high polymer resin plays a role in connection and carrier, the silica sol can enhance the heat resistance and temperature resistance of the electrothermal coating, the water-based wetting dispersant can enable the graphene and the inorganic filler to be dispersed in the coating more uniformly, the inorganic filler is added to enable the graphene to be dispersed more uniformly, and the stability and weather resistance of the electrothermal coating are also improved; by the synergistic compounding of the raw materials, the electrothermal coating with excellent performance is obtained, and further the electrothermal coating can be self-dried at normal temperature, and the flexibility, the temperature resistance, the heat resistance, the conductivity and the like are obviously enhanced. Meanwhile, the electric heating coating is harmless to the environment and human body, safe and environment-friendly.
According to the preparation method of the electric heating coating, the raw materials are uniformly mixed to obtain the electric heating coating, and the preparation method has the advantage of simple preparation process.
The electrothermal film provided by the invention is mainly prepared by coating the electrothermal coating on a film-forming carrier; the electrothermal film has the advantages of good flexibility, good temperature resistance and heat resistance and strong electric conductivity, which are determined by the performance of the electrothermal coating.
The electric heating coating or the electric heating film provided by the invention can be widely applied to electric heating.
The invention provides an electric heating device which comprises the electric heating film or is coated with the electric heating paint.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to one aspect of the invention, a graphene slurry is prepared mainly from expanded graphite and a cellulose derivative;
the graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene, and has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm.
The graphene slurry provided by the invention is mainly prepared from expanded graphite and a cellulose derivative, wherein graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene, and the graphene slurry has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm. The graphene slurry is prepared by taking 400-500 times of expanded graphite as a raw material and stripping the expanded graphite through a high-pressure homogenizing device by adopting a diamond interaction correlation homogenizing technology, so that the graphene slurry has the characteristics of thin sheet layer, uniform size and excellent conductivity, and simultaneously, graphene in the graphene slurry has a typical two-dimensional structure, the layer is flat, the defects are few, phonon movement is facilitated, the heat conductivity is excellent, a film is easily formed, and the far infrared radiation characteristic of the graphene can be perfectly embodied.
In a preferred embodiment of the present invention, the expansion ratio of the expanded graphite is in a range of 200 to 800 times, preferably 300 to 600 times, and more preferably 400 to 500 times;
typical but non-limiting preferred embodiments of the expansion ratio ranges of the above expanded graphite are: 200 times, 300 times, 400 times, 500 times, 600 times, 700 times, and 800 times.
In a preferred embodiment of the present invention, the cellulose derivative includes at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose;
preferably, the cellulose derivative comprises at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose;
in a preferred embodiment of the present invention, the mass ratio of the expanded graphite to the cellulose derivative is 5 to 30:1, preferably 10-20: 1, more preferably 15: 1.
The mass ratio of expanded graphite to cellulose derivative as described above is typically, but not by way of limitation, a preferred embodiment: 5: 1. 10: 1. 15: 1. 20: 1. 25: 1 and 30: 1.
according to an aspect of the present invention, a preparation method of the graphene paste includes the following steps:
dissolving a cellulose derivative in a solvent to obtain a cellulose derivative solution; then adding expanded graphite and mixing uniformly to obtain expanded graphite dispersion liquid; then, carrying out high-pressure homogenization treatment on the expanded graphite dispersion liquid to obtain graphene slurry;
the preparation method of the graphene slurry provided by the invention comprises the steps of dissolving a cellulose derivative in a solvent to obtain a cellulose derivative solution; then adding expanded graphite and mixing uniformly to obtain expanded graphite dispersion liquid; then, carrying out high-pressure homogenization treatment on the expanded graphite dispersion liquid to obtain graphene slurry; the preparation method has the advantages of simple production process and easy operation.
In a preferred embodiment of the present invention, the solvent is deionized water;
in a preferred embodiment of the present invention, the concentration of the cellulose derivative solution is 0.1 to 0.3 wt%;
as a preferred embodiment, the concentration of the cellulose derivative solution is selected so that the prepared graphene is uniformly dispersed in the slurry.
In a preferred embodiment of the present invention, the method for adding the expanded graphite is a method of stirring while adding;
in a preferred embodiment of the present invention, the pressure of the high-pressure homogenization treatment is 100 to 240MPa, and the time is 1 to 10 min;
in a preferred embodiment, the optimum selection of the pressure and time for the high-pressure homogenization treatment can produce graphene having the most excellent performance.
Preferably, the pressure of the high-pressure homogenization treatment is 180-220 MPa, and the time is 3 min.
According to one aspect of the invention, the graphene slurry is applied to preparing an electrothermal coating.
The graphene slurry provided by the invention can be widely applied to the preparation process of the electric heating coating.
According to one aspect of the invention, an electrothermal paint comprises the following raw materials: the graphene slurry, the aqueous polymer resin, the silica sol, the aqueous wetting dispersant, the inorganic filler, the auxiliary agent and water;
the electrothermal coating provided by the invention comprises the graphene slurry, water-based high polymer resin, silica sol, a water-based wetting dispersant, an inorganic filler, an auxiliary agent and water; wherein: the graphene slurry is used as a heating core, the water-based high polymer resin plays a role in connection and carrier, the silica sol can enhance the heat resistance and temperature resistance of the electrothermal coating, the water-based wetting dispersant can enable the graphene and the inorganic filler to be dispersed in the coating more uniformly, the inorganic filler is added to enable the graphene to be dispersed more uniformly, and the stability and weather resistance of the electrothermal coating are also improved; by the synergistic compounding of the raw materials, the electrothermal coating with excellent performance is obtained, and further the electrothermal coating can be self-dried at normal temperature, and the flexibility, the temperature resistance, the heat resistance, the conductivity and the like are obviously enhanced. Meanwhile, the electric heating coating is harmless to the environment and human body, safe and environment-friendly.
Preferably, the auxiliaries include film-forming auxiliaries, thickeners, defoamers and leveling agents;
preferably, the water is deionized water;
in a preferred embodiment of the invention, the electrothermal paint comprises the following raw materials by mass percent: 10-50 wt% of graphene slurry, 5-30 wt% of water-based polymer resin, 5-20 wt% of silica sol, 0.1-1 wt% of water-based wetting dispersant, 5-20 wt% of inorganic filler, 0.1-2 wt% of film-forming assistant, 0.1-1 wt% of thickener, 0.1-1 wt% of defoamer, 0.1-2 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100 wt%;
the invention takes the deionized water expressed by the 'balance' as an essential component to overcome the problem that the percentage range of each component in the electric heating coating is less than 100 percent.
Typical but non-limiting preferred embodiments of the graphene slurry described above are: 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt% and 50 wt%; typical but non-limiting preferred embodiments of the above aqueous polymeric resin are: 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt% and 30 wt%; typical but non-limiting preferred embodiments of the above silica sols are: 5 wt%, 10 wt%, 15 wt% and 20 wt%; typical but non-limiting preferred embodiments of the above aqueous wetting dispersants are: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, and 1 wt%; typical but non-limiting preferred embodiments of the above inorganic fillers are: 5 wt%, 10 wt%, 15 wt% and 20 wt%; typical but non-limiting preferred embodiments of the above-described coalescents are: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, and 1 wt%; 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, and 2 wt%; typical but non-limiting preferred embodiments of the above thickeners are: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, and 1 wt%; typical but non-limiting preferred embodiments of the above-mentioned antifoam are: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, and 1 wt%; typical but non-limiting preferred embodiments of the above leveling agents are: 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, and 1 wt%; 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, and 2 wt%.
In a preferred embodiment of the invention, the electrothermal paint comprises the following raw materials by mass percent: 15-45 wt% of graphene slurry, 8-28 wt% of water-based polymer resin, 8-18 wt% of silica sol, 0.2-0.8 wt% of water-based wetting dispersant, 8-18 wt% of inorganic filler, 0.2-1.5 wt% of film-forming assistant, 0.2-0.8 wt% of thickening agent, 0.2-0.8 wt% of defoaming agent, 0.5-1.5 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100 wt%;
in the above preferred embodiment, the electrothermal paint comprises the following raw materials by mass percent: 20-40 wt% of graphene slurry, 10-25 wt% of water-based polymer resin, 10-15 wt% of silica sol, 0.4-0.6 wt% of water-based wetting dispersant, 10-15 wt% of inorganic filler, 0.5-1 wt% of film-forming assistant, 0.3-0.6 wt% of thickener, 0.3-0.6 wt% of defoaming agent, 0.8-1.2 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100 wt%.
In the invention, the technical effect of the electrothermal coating is further optimized by further adjusting and optimizing the dosage proportion of the raw materials of each component.
In a preferred embodiment of the present invention, the aqueous polymer resin includes at least one of an aqueous polyurethane resin, an aqueous acrylic resin, an aqueous epoxy resin, an aqueous vinyl chloride-vinyl acetate copolymer, an aqueous polyurethane-modified epoxy resin, and an aqueous polyurethane-modified acrylic resin;
in a preferred embodiment of the invention, the silica sol comprises at least one of neutral silica sol ZS-30 and alkaline silica sol JS-30;
in a preferred embodiment, the pH property of the silica sol affects the dispersion effect of graphene, and thus the performance of the electrothermal paint.
In a preferred embodiment of the invention, the aqueous wetting dispersant comprises at least one of the product models Tilo-6002, KYC-9366, HH-2018 and AMORSO-7517B, preferably a pigment-philic group block copolymer of the model AMORSO-7517B;
in a preferred embodiment of the present invention, the inorganic filler includes at least one of mica powder, silica powder, talc powder, barite powder, heavy calcium powder, and kaolin;
more optionally, the particle size of the inorganic filler is 1-13 μm;
in a preferred embodiment of the invention, the coalescent comprises at least one of propylene glycol ethyl ether, propylene glycol butyl ether, hexylene glycol butyl ether acetate, and lauryl alcohol, preferably lauryl alcohol;
in a preferred embodiment of the present invention, the thickener comprises at least one of product models DN-2002, DN-2005, DN-2006, and DN-2009;
in a preferred embodiment of the present invention, the defoaming agent comprises at least one of product types B-227, B-227 and B-227;
in a preferred embodiment of the invention, the leveling agent comprises at least one of AMORSO-189T and AMORSO-185T.
According to one aspect of the invention, a preparation method of the electrothermal paint comprises the following steps:
uniformly mixing the raw materials to obtain the electrothermal coating;
according to the preparation method of the electric heating coating, the raw materials are uniformly mixed to obtain the electric heating coating, and the preparation method has the advantage of simple preparation process.
In a preferred embodiment of the present invention, the preparation method comprises the steps of:
uniformly mixing other raw materials except the graphene slurry and the inorganic filler to obtain mixed slurry A; then adding the graphene slurry into the mixed slurry A and uniformly mixing to obtain mixed slurry B; and then adding an inorganic filler into the mixed slurry B and uniformly mixing to obtain the electrothermal coating.
According to one aspect of the invention, the electrothermal film is mainly prepared by coating the electrothermal coating on a film-forming carrier;
the electrothermal film provided by the invention is mainly prepared by coating the electrothermal coating on a film-forming carrier; the electrothermal film has the advantages of good flexibility, good temperature resistance and heat resistance and strong electric conductivity, which are determined by the performance of the electrothermal coating.
In a preferred embodiment of the present invention, the film-forming support includes one of polyimide film, non-woven fabric, polyethylene film, and mylar film, preferably mylar film;
in a preferred embodiment of the invention, the coating comprises roll coating or knife coating, preferably knife coating.
As a preferred embodiment, the roller coating or blade coating mode has low requirement on the fineness of the coating, and the grinding is not carried out, so that the energy consumption and the cost are saved, and the production process is simplified.
In a preferred embodiment of the present invention, the surface of the electric heating film is further coated with an insulating flexible film for protecting.
According to one aspect of the invention, the use of the above electrothermal coating or the above electrothermal film in electrothermal heating.
The electric heating coating or the electric heating film provided by the invention can be widely applied to electric heating.
According to an aspect of the present invention, an electric heating device comprises the above electric heating film; or the electric heating device is coated with the electric heating paint.
As a preferable embodiment, the electric heating device includes an electric oven, an electric heating picture, an electric heating kang, a high-temperature tunnel oven, an electric heating ceiling, an electric heating wall curtain, a far infrared heating electric water heater, a bathroom mirror, a heating device in a sauna room, and the like.
It should be noted that the electric heating device includes a device body (for example, a radiator of an electric heating warmer), the electric heating coating is disposed on the surface of the device body, and the electric heating coating is disposed on the surface of the device body in a manner that an electric heating coating is first coated (coating manner includes spraying, etc.) on the surface of the device body, and the electric heating coating is dried to obtain the electric heating device with the electric heating coating, or the electric heating coating is first prepared, and then the electric heating coating is disposed on the surface of the device body to obtain the electric heating device.
The technical solution of the present invention will be further described with reference to examples and comparative examples.
Example 1
A preparation method of graphene slurry comprises the following steps:
dissolving carboxymethyl cellulose in deionized water, and stirring and mixing uniformly to form 0.1% cellulose derivative solution; providing expanded graphite with expansion multiplying power of 200-300 times, slowly adding the expanded graphite into the homogeneous solution while stirring, and fully and uniformly mixing to form a dispersion liquid of the expanded graphite; adding the expanded graphite dispersion liquid into a high-pressure homogenizer, setting the processing pressure to be 100Mpa, and carrying out high-pressure homogenization treatment for 3min to obtain graphene slurry;
wherein the mass ratio of the expanded graphite to the carboxymethyl cellulose is 5: 1.
example 2
A preparation method of graphene slurry comprises the following steps:
dissolving carboxymethyl cellulose in deionized water, and stirring and mixing uniformly to form 0.3% cellulose derivative solution; providing expanded graphite with the expansion ratio of 600-800 times, slowly adding the expanded graphite into the homogeneous solution while stirring, and fully and uniformly mixing to form a dispersion liquid of the expanded graphite; adding the expanded graphite dispersion liquid into a high-pressure homogenizer, setting the processing pressure to be 240Mpa, and carrying out high-pressure homogenization treatment for 3min to obtain graphene slurry;
wherein the mass ratio of the expanded graphite to the carboxymethyl cellulose is 30: 1.
Example 3
A preparation method of graphene slurry comprises the following steps:
dissolving carboxymethyl cellulose in deionized water, and stirring and mixing uniformly to form 0.2% cellulose derivative solution; providing expanded graphite with the expansion ratio of 400-500 times, slowly adding the expanded graphite into the homogeneous solution while stirring, and fully and uniformly mixing to form a dispersion liquid of the expanded graphite; adding the expanded graphite dispersion liquid into a high-pressure homogenizer, setting the processing pressure to be 180Mpa, and carrying out high-pressure homogenization treatment for 3min to obtain graphene slurry;
wherein the mass ratio of the expanded graphite to the carboxymethyl cellulose is 15: 1.
Example 4
This example was conducted in the same manner as example 1 except that the treatment pressure in the high-pressure homogenizer was 200 MPa.
Example 5
This example was conducted in the same manner as example 1 except that the treatment pressure in the high-pressure homogenizer was 220 MPa.
Example 6
This example is the same as example 1 except that carboxymethyl cellulose is replaced with carboxyethyl cellulose.
Example 7
This example is the same as example 2 except that carboxymethyl cellulose is replaced with carboxypropyl cellulose.
Example 8
An electric heating coating comprises the following raw materials:
10 wt% of graphene slurry prepared in example 1, 30 wt% of aqueous polyurethane resin, ZS-3020 wt% of neutral silica sol, 0.1 wt% of AMORSO-7517B aqueous wetting dispersant, 5 wt% of inorganic filler, 0.1 wt% of dodecanol ester, 0.1 wt% of carboxymethyl cellulose, 0.1 wt% of organic silicon defoamer, 0.1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electric heating coating comprises the following steps:
uniformly mixing other raw materials except the graphene slurry and the inorganic filler to obtain mixed slurry A; then adding the graphene slurry into the mixed slurry A and uniformly mixing to obtain mixed slurry B; and then adding an inorganic filler into the mixed slurry B and uniformly mixing to obtain the electrothermal coating.
Example 9
An electric heating coating comprises the following raw materials:
50 wt% of graphene slurry prepared in example 1, 5 wt% of aqueous polyurethane resin, 5 wt% of neutral silica sol ZS-305, 1 wt% of AMORSO-7517B aqueous wetting dispersant, 20 wt% of inorganic filler, 2 wt% of dodecanol ester, 1 wt% of carboxymethyl cellulose, 1 wt% of organic silicon defoamer, 2 wt% of polysiloxane leveling agent and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Example 10
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 1, 15 wt% of aqueous polyurethane resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B aqueous wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of dodecanol ester, 0.5 wt% of carboxymethyl cellulose, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Example 11
This example is the same as example 10 except that the graphene slurry was replaced with the graphene slurry prepared in example 2.
Example 12
This example is the same as example 10 except that the graphene slurry was replaced with the graphene slurry prepared in example 3.
Example 13
An electric heating coating comprises the following raw materials:
25 wt% of graphene slurry prepared in example 2, 15 wt% of water-based acrylic resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B water-based wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of dodecanol ester, 0.5 wt% of carboxymethyl cellulose, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Example 14
An electric heating coating comprises the following raw materials:
35 wt% of graphene slurry prepared in example 6, 15 wt% of water-based epoxy resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B water-based wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of lauryl alcohol ester, 0.5 wt% of carboxyethyl cellulose, 0.5 wt% of silicone defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Example 15
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 6, 20 wt% of aqueous polyurethane resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B aqueous wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of dodecanol ester, 0.5 wt% of carboxyethyl cellulose, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Example 16
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 7, 25 wt% of aqueous polyurethane resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B aqueous wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of dodecanol ester, 0.5 wt% of carboxypropyl cellulose, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
Comparative example 1
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 7, 25 wt% of waterborne polyurethane modified epoxy resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B waterborne wetting dispersant, 0.5 wt% of lauryl alcohol ester, 0.5 wt% of carboxypropyl cellulose, 0.5 wt% of silicone defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
In comparison with example 16, the electrothermal coating material of this comparative example does not contain an inorganic filler.
Comparative example 2
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 2, 25 wt% of waterborne polyurethane resin, ZS-3015 wt% of neutral silica sol, 0.5 wt% of AMORSO-7517B waterborne wetting dispersant, 10 wt% of inorganic filler, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
In comparison with example 16, the electrothermal coating material of this comparative example does not contain dodecanol ester and carboxypropyl cellulose.
Comparative example 3
An electric heating coating comprises the following raw materials:
30 wt% of graphene slurry prepared in example 6, 25 wt% of aqueous polyurethane resin, 0.5 wt% of AMORSO-7517B aqueous wetting dispersant, 20 wt% of inorganic filler, 0.5 wt% of dodecanol ester, 0.5 wt% of carboxypropyl cellulose, 0.5 wt% of organic silicon defoamer, 1 wt% of polysiloxane leveling agent, and the balance of deionized water; the sum of the mass percentages of the components in the electric heating coating is 100%.
The preparation method of the electrothermal paint is the same as that of example 8.
In comparison with example 16, the electric hot coating composition of this comparative example did not contain neutral silica sol ZS-30.
Experimental example 1
In order to show that the electrothermal coating prepared by the method has the advantages of good flexibility, good temperature resistance and heat resistance, strong conductivity and the like, the electrothermal coatings prepared in the embodiments 8-16 and the comparative examples 1-3 are coated on a polyester film in a blade coating mode, and are dried to obtain the graphene-based water-based electrothermal film.
The electric heating films prepared by adopting the electric heating coatings of the embodiments 8-16 and the comparative examples 1-3 are uniformly cut to be 20 x 40cm in size2After wiring, the current and the temperature rise time (the time required for rising to the maximum temperature of 90%) are tested under the input voltage of 220V, and the heat resistance and the temperature resistance (100 ℃ in an electric heating blowing oven for 7 days) are tested in the blowing oven, and the results are shown in the following table 1:
table 1:
from the experimental comparison data, the water-based graphene electrothermal paint and the electrothermal film prepared by the method have the advantages of strong electric conductivity, quick heating, good temperature resistance and heat resistance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The graphene slurry is characterized by being mainly prepared from expanded graphite and a cellulose derivative;
the graphene in the graphene slurry is a mixture of single-layer graphene and few-layer graphene which are prepared by taking expanded graphite as a raw material, and has the following technical indexes: the number of graphene layers is 1-3, and the diameter is 3-7 μm.
2. The graphene paste according to claim 1, wherein the expanded graphite has an expansion ratio ranging from 200 to 800 times;
the cellulose derivative comprises at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose;
the mass ratio of the expanded graphite to the cellulose derivative is 5-30: 1.
3. a method for preparing graphene paste according to claim 1 or 2, wherein the method comprises the following steps:
dissolving a cellulose derivative in a solvent to obtain a cellulose derivative solution; then adding expanded graphite and mixing uniformly to obtain expanded graphite dispersion liquid; and then carrying out high-pressure homogenization treatment on the expanded graphite dispersion liquid to obtain graphene slurry.
4. Use of the graphene paste according to claim 1 or 2 for preparing an electrothermal coating.
5. The electrothermal coating is characterized by comprising the following raw materials in percentage by mass: 10-50 wt% of graphene slurry, 5-30 wt% of water-based polymer resin, 5-20 wt% of silica sol, 0.1-1 wt% of water-based wetting dispersant, 5-20 wt% of inorganic filler, 0.1-2 wt% of film-forming assistant, 0.1-1 wt% of thickener, 0.1-1 wt% of defoamer, 0.1-2 wt% of flatting agent and the balance of deionized water;
the sum of the mass percentages of the components in the electric heating coating is 100%.
6. The electrothermal paint according to claim 5, wherein the aqueous polymer resin comprises at least one of aqueous polyurethane resin, aqueous acrylic resin, aqueous epoxy resin, aqueous vinyl chloride-vinyl acetate resin, aqueous polyurethane-modified epoxy resin, and aqueous polyurethane-modified acrylic resin;
the silica sol comprises at least one of neutral silica sol ZS-30 and alkaline silica sol JS-30;
the aqueous wetting dispersant comprises at least one of Tilo-6002, KYC-9366, HH-2018 and AMORSO-7517B;
the inorganic filler comprises at least one of mica powder, silica micropowder, talcum powder, barite powder, coarse whiting powder and kaolin;
the film forming auxiliary agent comprises at least one of propylene glycol ethyl ether, propylene glycol butyl ether, hexylene glycol butyl ether acetate and dodecyl alcohol ester;
the thickening agent comprises at least one of DN-2002, DN-2005, DN-2006 and DN-2009;
the defoaming agent comprises at least one of B-227, B-227 and B-227;
the leveling agent comprises at least one of AMORSO-189T and AMORSO-185T.
7. A method for preparing an electrothermal coating according to claim 5 or 6, comprising the steps of:
and (3) uniformly mixing the raw materials to obtain the electrothermal coating.
8. An electrothermal film, characterized in that the electrothermal film is mainly prepared by coating the electrothermal paint of claim 5 or 6 on a film-forming carrier;
the film forming carrier comprises one of polyimide film, non-woven fabric, polyethylene film and polyester film.
9. Use of an electrothermal coating according to claim 5 or 6, or an electrothermal film according to claim 8, in electrothermal heating.
10. An electrothermal device, characterized in that the electrothermal device comprises the electrothermal film according to claim 8;
or, the electric heating device is coated with the electric heating dope of claim 5 or 6.
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