CN115534438A - Efficient heat-dissipation film-coated color plate and preparation process thereof - Google Patents
Efficient heat-dissipation film-coated color plate and preparation process thereof Download PDFInfo
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Abstract
The application relates to the field of plates for household appliance shells, and particularly discloses a high-efficiency heat-dissipation film-coated color plate and a preparation process thereof. The high-efficiency heat dissipation film-coated color plate comprises a substrate, a first chemical treatment layer, a second chemical treatment layer, a thermal bonding layer, a composite film layer and a back paint layer, wherein the first chemical treatment layer and the second chemical treatment layer are respectively positioned on two sides of the substrate; the composite film layer sequentially comprises a PVC film, a graphene film and a PET film, and the PVC film is in contact with the thermal bonding layer; the graphene film comprises the following raw materials in percentage by mass: graphene oxide, glass fibers and carbon fibers =1 (0.3-0.6) to (0.2-0.5). The utility model provides a various board of high-efficient heat dissipation tectorial membrane has coefficient of heat conductivity height, and the radiating effect is good, the good advantage of sound insulation effect.
Description
Technical Field
The application relates to the technical field of plates for household appliance shells, in particular to a high-efficiency heat-dissipation film-coated color plate and a preparation process thereof.
Background
The coated color plate has good aesthetic property, practicability and processability, is a common material for household appliance shells, architectural decorations and the like, and can be used for refrigerator shells, refrigerator side plates, washing machine shells, microwave oven shells, architectural external wall plates, architectural doors and windows and the like.
In the prior art, a chinese patent application No. CN2010102931866 discloses a film-coated color plate, which includes a substrate, and a composite color film located on at least one side of the substrate, the composite color film sequentially includes a polyvinyl chloride layer, a wire-drawing metal foil or wire-drawing alloy foil, and a polyethylene terephthalate layer along a direction away from the substrate, wherein a wire-drawing surface of the wire-drawing metal foil or wire-drawing alloy foil is connected to the polyethylene terephthalate layer; and the hot laminating glue layer is positioned between the composite color film and the substrate.
According to the film-coated color plate, the binding force between the film-coated color plate and the polyethylene terephthalate layer is increased by utilizing the wire-drawing metal foil or the wire-drawing alloy foil, so that the binding force between the layers of the composite color film is strong, the composite color film is not easy to damage, but the stretched metal foil or the wire-drawing alloy foil with better heat insulation performance is used for a household appliance shell, heat generated during the working of the household appliance cannot be timely dissipated, and the internal components of the household appliance are easy to generate thermal aging.
In view of the above-mentioned related technologies, the inventors found that the obtained film-coated color sheet has poor heat dissipation performance, which affects the application of the film-coated color sheet in the fields of home appliance housings and the like.
Disclosure of Invention
In order to improve the heat dissipation effect of the film-coated color plate, the application provides a high-efficiency heat dissipation film-coated color plate and a preparation process thereof.
In a first aspect, the present application provides a high-efficient heat dissipation tectorial membrane color plate, adopts following technical scheme:
a high-efficiency heat-dissipation film-coated color plate comprises a substrate, a first chemical treatment layer and a second chemical treatment layer which are respectively positioned on two sides of the substrate, a thermal bonding layer and a composite film layer which are positioned on the first chemical treatment layer, and a back paint layer which is positioned on the second chemical treatment layer, wherein the thermal bonding layer is in contact with the first chemical treatment layer;
the composite film layer comprises a PVC film, a graphene film and a PET film which are sequentially bonded, and the PVC film is in contact with the thermal bonding layer;
the graphene film comprises the following raw materials in mass ratio: graphene oxide, glass fibers and carbon fibers =1 (0.3-0.6) to (0.2-0.5).
By adopting the technical scheme, the graphene film is a brand-new heat conduction and dissipation material, uniform heat conduction can be carried out along two directions, the heat conduction and dissipation effects are very obvious, the graphene film is light in weight and low in thermal resistance, the highest heat conduction coefficient of the carbon fiber can reach 700W/m.k, the graphene film has good mechanical properties and excellent heat conduction and radiation heat dissipation capabilities, the carbon fiber has good sound absorption performance, and the glass fiber has sound absorption, noise reduction and sound insulation effects, so that the prepared graphene film has the effects of noise reduction and sound absorption while having the heat conduction and dissipation effects.
Optionally, the graphene film is prepared by a preparation method comprising:
(1) Adding graphene oxide into deionized water, and performing ultrasonic dispersion for 20-30min to prepare a graphene oxide dispersion liquid with the concentration of 1-5 wt%;
(2) Adding glass fibers and carbon fibers into deionized water, performing ultrasonic dispersion for 2-3 hours to prepare a mixed fiber dispersion liquid, and performing suction filtration to obtain a mixed fiber skeleton;
(3) And adding the graphene oxide dispersion liquid into the mixed fiber framework, carrying out vacuum filtration, carrying out vacuum drying, heating to 800-820 ℃ under the conditions of 30-35MPa and argon as a protective gas, and carrying out heat preservation for 1.5-2h to obtain the graphene membrane.
By adopting the technical scheme, the glass fiber and the carbon fiber are ultrasonically dispersed by the deionized water, the dispersion uniformity of the two fibers in the deionized water is improved, then the glass fiber and the carbon fiber have no obvious orientation after suction filtration and are mutually staggered to form a mixed fiber framework, after the graphene oxide dispersion liquid is added, the graphene oxide is deposited on the mixed fiber framework which is randomly distributed through suction filtration, the gaps of the mixed fiber framework can be effectively filled, the graphene is formed after thermal reduction, the graphene uniformly coats the mixed fiber framework to form a graphene film, the framework formed by the glass fiber and the carbon fiber can reduce the stacking of graphene sheets, reduce the phonon scattering among the graphene sheets and further achieve the effect of improving the heat conductivity of the graphene film,
optionally, in the step (2), modified multi-walled carbon nanotubes are further added to the mixed fiber dispersion liquid, and the addition amount of the modified multi-walled carbon nanotubes is 20-40% of the total weight of the carbon fibers and the glass fibers.
By adopting the technical scheme, the multi-walled carbon nanotube is high in heat conductivity, so that the multi-walled carbon nanotube is used for laminating a color plate, the heat conductivity can be improved, the heat dissipation effect is improved, and the effect of noise reduction is achieved due to the addition of the multi-walled carbon nanotube.
Optionally, the modified multi-walled carbon nanotube is prepared by the following method:
dispersing 0.8-1 part by weight of multi-walled carbon nano-tube in 1.6-2 parts by weight of N-dimethyl pyrrolidone solution, adding 0.2-0.4 part by weight of silicon dioxide magnetic hollow microsphere and 0.05-0.1 part by weight of polyvinylidene fluoride, and carrying out ultrasonic treatment for 60-80min to obtain a dispersion liquid; adding 0.5-1.2 parts by weight of chitosan into 1-3% of acetic acid solution, stirring and dissolving to obtain 3-5wt% of chitosan solution;
and mixing the chitosan solution and the dispersion liquid, stirring uniformly, washing with deionized water, and drying in vacuum.
By adopting the technical scheme, N-dimethyl pyrrolidone is used as a solvent, polyvinylidene fluoride is dissolved, and the silicon dioxide magnetic hollow microspheres are loaded on the multi-walled carbon nano tubes, so that the noise reduction and sound absorption effects of the modified multi-walled carbon nano tubes are improved due to the hollow structure of the silicon dioxide magnetic hollow microspheres; the carbon nano tube has the entanglement characteristic, so that the dispersibility of the carbon nano tube in the mixed fiber dispersion liquid is limited, the multi-walled carbon nano tube is wound by chitosan, the dispersibility of the multi-walled carbon nano tube in the mixed fiber dispersion liquid is improved, the chitosan is used as a very good natural polymer carbon nano tube dispersing agent to modify the surface of the multi-walled carbon nano tube, and the composite structure of the silicon dioxide magnetic hollow microsphere and the multi-walled carbon nano tube cannot be damaged.
Optionally, in the step (2), rubidium magnets with opposite magnetic poles are arranged on two sides of the mixed fiber dispersion liquid, and after the fiber mixed dispersion liquid is stabilized under the action of a magnetic field, vacuum filtration is performed.
By adopting the technical scheme, the modified multi-walled carbon nanotubes have ferromagnetism under the action of the silicon dioxide magnetic microspheres, under the action of rubidium magnets with opposite magnetic poles, the multi-walled carbon nanotubes loaded with the silicon dioxide magnetic hollow microspheres are rearranged in the fiber mixed dispersion liquid in a nearly parallel mode along the magnetic induction line direction through the guidance of an external magnetic field and form parallel arrangement, when the graphene oxide dispersion liquid is subsequently added and vacuum filtration is carried out, the graphene oxide is deposited on the surface of a framework formed by the modified multi-walled carbon nanotubes, the glass fibers and the carbon fibers which are arranged in parallel, so that the graphene oxide is wrapped by the graphene oxide, and after thermal reduction, the graphene film keeps good mechanical properties, the bending property of a graphene matrix is effectively enhanced, the addition of the modified multi-walled carbon nanotubes can effectively fill up the gaps of the mixed fiber framework, the stacking of graphene sheets is reduced, the sheet spacing of the graphene is increased, the in-plane scattering of phonons in the heat conduction process is reduced, and the heat conduction and heat dissipation effects of the graphene film are further improved.
Optionally, a noise reduction film is bonded between the thermal bonding layer and the first chemical treatment layer through a hot melt adhesive, and the noise reduction film is prepared by the following method:
ultrasonically cleaning a foamed nickel screen for 10-15min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 25-30 parts by weight of methylcellulose and 300-350 parts by weight of deionized water, adding 325-380 parts by weight of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking the foamed nickel net in the emulsion for 5-10min, taking out the foamed nickel net, preserving the temperature at 100-120 ℃ for 10-20min, heating to 450-480 ℃, preserving the temperature for 20-30min, and cooling to room temperature to prepare the noise reduction film.
By adopting the above technical scheme, when tectorial membrane color plate is used for the household electrical appliances shell, the household electrical appliances during operation produce the noise, and foam nickel net has pore structure, it is high to inhale the sound frequency, give sound insulation, under the auxiliary action of compound rete, make tectorial membrane color plate have higher noise separation effect, and foam nickel net has high temperature resistant, the pore type is even and heat-conduction fast advantage, dip-coat titanium dioxide sol on foam nickel net, through heat treatment, get rid of nitric acid and organic substance in the gel, can also make titanium dioxide sintering form the titanium dioxide membrane of high strength together, and with foam nickel net firm combination together, and methylcellulose is as the pore-forming agent when heat treatment, can increase the hole quantity of titanium dioxide membrane, improve specific surface area, further improve the noise reduction effect, the titanium dioxide membrane has higher heat conduction effect, can improve the heat-sinking capability of the membrane of making an uproar.
Optionally, the substrate is one of an electroplated galvanized sheet, a cold-rolled sheet and a hot-dip galvanized sheet.
In a second aspect, the present application provides a process for preparing a high-efficiency heat-dissipating film-coated color sheet, which adopts the following technical scheme: a preparation process of a high-efficiency heat-dissipation film-coated color plate comprises the following steps:
degreasing the surface of the substrate, soaking the substrate in a passivation solution, taking out the substrate and drying the substrate, and respectively forming a first chemical treatment layer and a second chemical treatment layer on two sides of the substrate;
coating a back paint on the surface of the second chemical treatment layer, and drying to form a back paint layer;
the hot melt adhesive is coated on the first chemical treatment layer, the temperature is raised and the composite film layer is coated on the hot melt adhesive in an attaching mode, the composite film layer sequentially comprises a PVC film, a graphene film and a PET film, and the PVC film is arranged on one side close to the hot melt adhesive.
By adopting the technical scheme, the first chemical treatment layer and the second chemical treatment layer are formed after the substrate is degreased and passivated, so that the adhesive strength of the substrate, the thermal adhesive layer and the back paint layer can be increased.
Optionally, a noise reduction film is adhered between the thermal adhesive layer and the first chemical treatment layer through hot melt adhesive, and the noise reduction film is prepared by the following method:
ultrasonically cleaning a foamed nickel screen for 10-15min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 25-30 parts by weight of methylcellulose and 300-350 parts by weight of deionized water, adding 325-380 parts by weight of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking the foamed nickel net in the emulsion for 5-10min, taking out the foamed nickel net, preserving the temperature at 100-120 ℃ for 10-20min, heating to 450-480 ℃, preserving the temperature for 20-30min, and cooling to room temperature to prepare the noise reduction film.
Through adopting above-mentioned technical scheme, the foam nickel net has pore structure, it is high to inhale the sound frequency, give sound insulation, under the auxiliary action of compound rete, make tectorial membrane color plate have higher noise separation effect, and the foam nickel net has high temperature resistant, the pore type is even and heat-conduction is fast advantage, dip-coat titanium dioxide sol on the foam nickel net, through thermal treatment, get rid of nitric acid and organic matter in the gel, still can make titanium dioxide sintering together form the titanium dioxide membrane of high strength, and be in the same place with foam nickel net is firm, and methyl cellulose is as the pore-forming agent when thermal treatment, can increase the hole quantity of titanium dioxide membrane, improve specific surface area, further improve the effect of making an uproar, the titanium dioxide membrane has higher heat conduction effect, can improve the heat-sinking capability of the membrane of making an uproar.
Preferably, the composite film layer is prepared by the following method: and coating hot melt adhesive on two sides of the graphene film, heating and activating, and attaching the PVC film and the PET film on two sides of the graphene film.
In summary, the present application has the following beneficial effects:
1. because this application adopts PVC membrane, graphite alkene membrane and PET membrane to constitute compound rete, because graphite alkene membrane is a high heat conduction and high radiating new material, and wherein has still added the carbon fiber of high heat conduction to and have the glass fiber who makes an uproar and give sound insulation, made good heat dissipation, and had the tectorial membrane color plate of the effect that gives sound insulation.
2. According to the graphene film, carbon fibers and glass fibers are preferably uniformly dispersed and then are subjected to suction filtration to form a fiber framework, graphene oxide is deposited on the fiber framework and is subjected to thermal reduction to form graphene, the graphene oxide is coated on the carbon fibers and the glass fibers to form a graphene film, and the framework material formed by the two fibers can reduce stacking of graphene sheets, increase the density of the graphene film and improve the heat conducting performance and the heat dissipation effect of the graphene film.
3. In the application, the modified multi-walled carbon nanotubes containing the silicon dioxide magnetic hollow microspheres are preferably added into the graphene film, and the modified multi-walled carbon nanotubes are arranged in two fibers in parallel under the action of the magnetic field of the rubidium magnets with opposite magnetism, so that the compactness of the graphene film is improved, the heat conduction performance is improved, and the sound insulation effect of the graphene film is improved.
4. Preferably add in the various board of tectorial membrane in this application and fall the membrane of making an uproar, and fall the membrane of making an uproar and adhere on first chemical treatment layer by hot melt adhesive, fall the membrane of making an uproar and become by foam nickel net coating titanium dioxide sol, after thermal treatment, form the titanium dioxide membrane on the foam nickel net and make, foam nickel net and the titanium dioxide membrane that has porous structure can improve the various board's of tectorial membrane noise reduction sound absorption effect.
Drawings
Fig. 1 is a schematic cross-sectional structure view of an efficient heat dissipation film-coated color sheet in example 1;
fig. 2 is a schematic cross-sectional view of a high-efficiency heat-dissipating film-coated color sheet in example 6.
In the figure: 1. a substrate; 11. a first chemical treatment layer; 12. a second chemical treatment layer; 2. a thermal adhesive layer; 3. compounding a film layer; 31. a PVC film; 32. a graphene film; 33. a PET film; 4. a back paint layer; 5. a noise reduction film.
Detailed Description
Preparation examples 1 to 5 of graphene film 32
The silica magnetic hollow microspheres in preparation examples 1 to 5 were selected from the group consisting of Sienna Rexi Biotechnology Ltd, type 500 nm, multi-walled carbon nanotubes having an outer diameter of 5 to 15nm, type TNM1.
Preparation example 1: (1) Adding 1kg of graphene oxide into deionized water, and performing ultrasonic dispersion for 30min to prepare a graphene oxide dispersion liquid with the concentration of 5 wt%;
(2) Adding 0.6kg of glass fiber and 0.5kg of carbon fiber into 1.5kg of deionized water, performing ultrasonic dispersion for 3 hours to prepare mixed fiber dispersion, and performing vacuum filtration to obtain a mixed fiber framework;
(3) And adding the graphene oxide dispersion liquid into the mixed fiber framework, performing vacuum filtration, performing vacuum drying at 50 ℃ for 8 hours, heating to 820 ℃ under the condition of 35MPa and argon as protective gas, and preserving heat for 1.5 hours to obtain the graphene film 32.
Preparation example 2: (1) Adding 1kg of graphene oxide into deionized water, and performing ultrasonic dispersion for 20min to prepare a graphene oxide dispersion liquid with the concentration of 1 wt%;
(2) Adding 0.3kg of glass fiber and 0.2kg of carbon fiber into 1kg of deionized water, performing ultrasonic dispersion for 2 hours to prepare a mixed fiber dispersion liquid, and performing vacuum filtration to obtain a mixed fiber framework;
(3) And adding the graphene oxide dispersion liquid into the mixed fiber framework, carrying out vacuum filtration, carrying out vacuum drying for 8h at 50 ℃, heating to 800 ℃ under the condition of 30MPa and argon as a protective gas, and carrying out heat preservation for 2h to obtain the graphene film 32.
Preparation example 3: the difference from the preparation example 1 is that in the step (2), modified multi-walled carbon nanotubes are further added into the mixed fiber dispersion liquid, the addition amount of the modified multi-walled carbon nanotubes is 40% of the total weight of the carbon fibers and the glass fibers, and the modified multi-walled carbon nanotubes are prepared by the following method:
dispersing 1kg of multi-walled carbon nanotubes in 2kg of N-dimethyl pyrrolidone solution, adding 0.4kg of silicon dioxide magnetic hollow microspheres and 0.1kg of polyvinylidene fluoride, and carrying out ultrasonic treatment for 80min to obtain a dispersion liquid;
adding 1.2kg of chitosan into an acetic acid solution with the mass concentration of 3%, stirring and dissolving to prepare a chitosan solution with the mass concentration of 5%;
mixing the chitosan solution and the dispersion liquid, stirring uniformly, washing with deionized water, and drying in vacuum.
Preparation example 4: the difference from preparation example 1 is that in step (2), modified multi-walled carbon nanotubes are also added into the mixed fiber dispersion liquid, the addition amount of the modified multi-walled carbon nanotubes is 20% of the total weight of the carbon fibers and the glass fibers, and the modified multi-walled carbon nanotubes are prepared by the following method:
dispersing 0.8kg of multi-walled carbon nanotubes in 1.6kg of N-dimethyl pyrrolidone solution, adding 0.2kg of silicon dioxide magnetic hollow microspheres and 0.05kg of polyvinylidene fluoride, and carrying out ultrasonic treatment for 60min to obtain a dispersion liquid;
adding 0.5kg of chitosan into 1% acetic acid solution, stirring and dissolving to obtain 3% chitosan solution;
mixing the chitosan solution and the dispersion liquid, stirring uniformly, washing with deionized water, and drying in vacuum.
Preparation example 5: the difference from the preparation example 3 is that, in the step (2), rubidium magnets with opposite magnetic poles are arranged on two sides of the mixed fiber dispersion liquid, and after the fiber mixed dispersion liquid is stabilized under the action of a magnetic field, vacuum filtration is carried out.
Production examples 6 to 10 of noise reduction film 5
Preparation example 6: ultrasonically cleaning a foamed nickel screen for 10min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 30g of methylcellulose and 350g of deionized water, adding 380g of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking a foamed nickel screen in the emulsion for 10min, taking out the foamed nickel screen, heating to 120 ℃ at the speed of 3 ℃/min, preserving heat for 10min, heating to 480 ℃ at the speed of 22 ℃/min, preserving heat for 20min, and cooling to room temperature to prepare the noise reduction film 5.
Preparation example 7: ultrasonically cleaning a foamed nickel screen for 10min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 25g of methyl cellulose and 300g of deionized water, adding 325g of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking the foamed nickel screen in the emulsion for 5min, taking out the foamed nickel screen, heating to 100 ℃ at the speed of 3 ℃/min, preserving heat for 20min, heating to 450 ℃ at the speed of 22 ℃/min, preserving heat for 30min, and cooling to room temperature to prepare the noise reduction film 5.
Preparation example 8: the difference from preparation example 6 is that the nickel foam mesh was not treated with the emulsion, and was used as the noise reduction film 5.
Preparation example 9: the difference from preparation example 6 is that no methylcellulose was added.
Preparation example 10: the difference from preparation example 6 is that an equal amount of silica sol was used instead of titania sol.
Examples
Example 1: the utility model provides a colored sheet of high-efficient heat dissipation tectorial membrane, including base plate 1, the first chemical treatment layer 11 and the second chemical treatment layer 12 that are located base plate 1 upper and lower both sides respectively, be equipped with hot bonding layer 2 and compound rete 3 on the first chemical treatment layer 11 in proper order, be equipped with back paint layer 4 on the second chemical treatment layer 12, compound rete 3 is PVC membrane 31, graphite alkene membrane 32 and PET membrane 33 in proper order, and PVC membrane 31 and hot bonding layer 2 contact each other, base plate 1 is hot galvanizing plate, graphite alkene membrane 32 is made by preparation example 1.
The preparation process of the high-efficiency heat-dissipation film-coated color plate comprises the following steps:
s1, degreasing the surface of a substrate 1 by using 1.5% alkali liquor at the temperature of 50 ℃, cleaning, drying, soaking in passivation solution for 10min, taking out, drying at the temperature of 40 ℃, and forming a first chemical treatment layer 11 and a second chemical treatment layer 12 on two sides of the substrate respectively, wherein the passivation solution is a passivation solution with the model of Bonderite 1402W;
s2, coating a back paint on the surface of the second chemical treatment layer 12, and drying at 220 ℃ to form a back paint layer 4, wherein the back paint is an acrylic emulsion with the model of R-90;
s3, coating the hot melt adhesive on the first chemical treatment layer 11, heating to 180 ℃ for activation to form a thermal bonding layer 2, pasting the composite film layer 3 on the thermal bonding layer 2, wherein the composite film layer 3 sequentially comprises a PVC film 31, a graphene film 32 and a PET film 33, the PVC film 31 is arranged on one side close to the thermal bonding layer 2, and the preparation method of the composite film layer 3 is as follows: and coating hot melt adhesive on two sides of the graphene film 32, heating to 180 ℃ for activation, and respectively attaching the PVC film 31 and the PET film 33 on two sides of the graphene film 32.
Example 2: a high-efficiency heat-dissipation film-coated color plate, which is different from the embodiment 1 in that the graphene film 32 is prepared by the preparation example 2.
Example 3: a high-efficiency heat-dissipation film-coated color plate, which is different from the embodiment 1 in that the graphene film 32 is prepared by the preparation example 3.
Example 4: a high-efficiency heat-dissipating film-coated color sheet, which is different from example 1 in that a graphene film 32 is prepared by preparation example 4.
Example 5: a high-efficiency heat-dissipating film-coated color sheet, which is different from example 1 in that a graphene film 32 is prepared by preparation example 5.
Example 6: an efficient heat dissipation film-coated color plate is different from the embodiment 5 in that the color plate further comprises a noise reduction film 5, the noise reduction film 5 is positioned between a thermal bonding layer 2 and a first chemical treatment layer 11, and the pasting method comprises the following steps: and coating hot melt adhesive on the first chemical treatment layer 11, heating to 180 ℃ for activation, and then attaching the noise reduction film 5 on the hot melt adhesive, wherein the noise reduction film 5 is prepared from preparation example 6.
Example 7: an efficient heat-dissipation film-coated color plate is different from the embodiment 6 in that a noise reduction film 5 is prepared from the preparation example 7
Example 8: an efficient heat dissipation film-coated color plate is different from the embodiment 6 in that a noise reduction film 5 is prepared by the preparation example 8.
Example 9: a high-efficiency heat-dissipating film-coated color plate, which is different from example 6 in that a noise reduction film 5 was prepared according to preparation example 9.
Example 10: a high-efficiency heat-dissipating film-coated color plate, which is different from example 6 in that a noise reduction film 5 was produced according to preparation example 10.
Comparative example
Comparative example 1: the high-efficiency heat dissipation film-coated color plate is different from the embodiment 1 in that carbon fibers are not added into the graphene film 32.
Comparative example 2: the efficient heat dissipation film-coated color plate is different from the embodiment 1 in that glass fibers are not added into the graphene film 32.
Comparative example 3: the efficient heat dissipation film-coated color plate is different from the embodiment 1 in that a graphene film is not arranged in a composite film layer 3.
Comparative example 4: an efficient heat dissipation film-coated color sheet is different from the embodiment 1 in that aluminum foil is used instead of the graphene film 32.
Comparative example 5: a tectorial membrane color plate, includes base plate 1, and this base plate 1 is the steel sheet, has chemical treatment layer 2 respectively in the both sides of base plate 1, has back coating 8 on chemical treatment layer 2 of base plate 1 one side, has under coat 9 on chemical treatment layer 2 of base plate 1 opposite side, has heat laminating glue layer 3 on the under coat 9, and it has compound various membrane to paste on heat laminating glue layer 3, and this compound various membrane of direction along keeping away from base plate 1 includes in proper order: the film comprises a polyvinyl chloride layer 4, a wiredrawing aluminum foil 10 and a polyethylene terephthalate layer 6, wherein the wiredrawing surface of the wiredrawing aluminum foil 10 is connected with the polyethylene terephthalate layer 6 (namely the wiredrawing surface faces to the outer surface of the film-coated color plate); the polyethylene terephthalate layer 6 may be a printed colored polyethylene terephthalate layer 6 (i.e., may be provided with a printed colored layer 61).
Performance test
The film-coated color plates were prepared according to the methods of examples and comparative examples, the properties of the film-coated color plates were measured with reference to the following methods, and the measurement results are recorded in table 1.
1. Bending property: detecting according to 0T bending (180 ℃);
2. film adhesion: 5mm multiplied by 5mm grids are scribed on the sample plate, and the cupping is 8mm;
3. coefficient of thermal conductivity: testing according to ASTM-5470 Standard test method for thermal conductivity of thermally conductive and electrically insulating Material;
4. and (3) sound insulation effect: the manufacturing method comprises the steps of manufacturing the film-coated color plate into square sample boxes with the same thickness and the same size, placing a noise maker in the sample boxes to continuously release 70 decibels of noise, placing a noise measuring instrument outside the sample boxes at the same distance from the sample boxes, recording numbers displayed on the noise measuring instrument, and calculating the sound insulation effect.
TABLE 1 Performance testing of film-coated color plaques
As can be seen from table 1, the thermal conductivity of the coated color plates prepared in examples 1 and 2 using the graphene films prepared in preparation examples 1 and 2, respectively, reaches 1.14W/(m · k), and the coated color plates have noise reduction and sound insulation effects.
In example 3 and example 4, the graphene films prepared in preparation examples 3 and 4 were used, respectively, and compared with example 1, the thermal conductivity of the coated color plates prepared in examples 3 and 4 was increased, and the sound insulation effect was improved, which shows that the modified multi-walled carbon nanotubes prepared using the silica magnetic hollow microspheres, polyvinylidene fluoride, and multi-walled carbon nanotubes can improve the thermal conductivity of the graphene film, and the sound insulation effect of graphene can be enhanced by adding the modified carbon nanotubes.
In example 5, compared with example 3, the graphene prepared in preparation example 5 is used, and not only the modified multi-walled carbon nanotubes are added, but also the rubidium magnet with opposite magnetism is used to perform magnetic field sequencing on the fiber mixed dispersion liquid, so that the prepared graphene film further improves the thermal conductivity of the film-coated color plate, but has little influence on the noise reduction and sound absorption effects of the film-coated color plate.
The difference between the embodiment 6 and the embodiment 5 is that in the film-coated color plate, the noise reduction film is connected to the first chemical treatment layer 11 through the hot melt adhesive, the noise reduction film is made of the preparation example 6, when the noise reduction film is prepared, components such as a foamed nickel net and titanium dioxide sol are used, the film-coated color plate with the noise reduction film is added, the thermal conductivity is further improved, the blocking and absorbing effects on sound are obviously improved, the sound insulation effect can reach more than 41dB, the thermal conductivity of the film-coated color plate can be improved through the noise reduction film, and the noise reduction and sound insulation effect of the film-coated color plate is improved.
Example 7 compared with example 6, the coated color plate of example 7, which uses the noise reduction film of preparation example 7, has similar test results to example 6, and the thermal conductivity and the sound insulation effect are improved compared with example 5.
Example 8 compared with example 6, the coated color plate made in example 8 has a lower thermal conductivity and a lower sound insulation effect when only the foamed nickel mesh is used as the noise reduction film, which means that the sound insulation effect of the foamed nickel mesh can be effectively improved and the thermal conductivity of the foamed nickel mesh can be improved after the foamed nickel mesh is soaked in the emulsion made by mixing the titanium dioxide sol and the methyl cellulose and then is subjected to heat treatment.
In example 9, compared to example 6, when a noise reduction film was produced, methylcellulose was not used, and table 1 shows that the sound insulation effect of the coated color sheet produced in example 9 was inferior to that of example 6, but the thermal conductivity was not changed so much, indicating that no methylcellulose was added, pores could not be formed in the titanium dioxide film, and the specific surface area of the titanium dioxide film could not be increased.
In example 10, the noise reduction film prepared in preparation example 10 was used, and in preparation example 10, the titanium dioxide sol was used instead of the silica sol, and the film-coated color plate prepared in example 10 had a sound insulation effect similar to that of example 6, but the heat dissipation effect was inferior to that of plastic 6, which indicates that the sound insulation effect and the heat dissipation effect of the film-coated color plate were improved by treating the nickel foam mesh with the titanium dioxide sol.
Comparative examples 1 and 2 compared to example 1, in the case of preparing the graphene film, carbon fiber and glass fiber were not added, respectively, and it is shown in table 1 that the heat conductivity of the coated color sheets prepared in comparative examples 1 and 2 is reduced and the sound insulation effect is reduced.
Compared with the embodiment 1, the comparative example 3 has the advantages that the graphene film is not arranged in the composite film layer 3, the composite film layer 3 only contains the PVC film and the PET film, and the sound insulation and heat conduction effects of the film-coated color plate prepared in the comparative example 3 are obviously poor.
Compared with the example 1, the aluminum foil is used for replacing the graphene film, and the film-coated color plate prepared in the comparative example 4 has a reduced heat dissipation effect, but has an enhanced noise blocking effect.
Comparative example 5 is a coated color plate prepared by the prior art, which is compounded by adopting a drawn metal foil, PVC and PET, and table 1 shows that the coated color plate has a good sound insulation effect, the sound insulation can reach 34.4dB, but the heat dissipation effect is poor, the heat conductivity coefficient is only 0.87W/(m.k), and when the coated color plate is used for a shell of a household appliance, the heat generated inside the household appliance is difficult to dissipate quickly, so that internal parts or wires are easy to age.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The efficient heat dissipation film-coated color plate is characterized by comprising a substrate (1), a first chemical treatment layer (11) and a second chemical treatment layer (12) which are respectively positioned at two sides of the substrate (1), a thermal bonding layer (2) and a composite film layer (3) which are positioned on the first chemical treatment layer (11), and a back paint layer (4) which is positioned on the second chemical treatment layer (12), wherein the thermal bonding layer (2) is in contact with the first chemical treatment layer (11);
the composite film layer (3) comprises a PVC film (31), a graphene film (32) and a PET film (33) which are bonded in sequence, wherein the PVC film (31) is in contact with the thermal bonding layer (2);
the graphene film (32) comprises the following raw materials in percentage by mass: graphene oxide, glass fibers and carbon fibers =1 (0.3-0.6) and (0.2-0.5).
2. The color plate with efficient heat dissipation and film coating as claimed in claim 1, wherein: the graphene film (32) is prepared by a preparation method comprising the following steps:
(1) Adding graphene oxide into deionized water, and performing ultrasonic dispersion for 20-30min to prepare a graphene oxide dispersion liquid with the concentration of 1-5 wt%;
(2) Adding glass fibers and carbon fibers into deionized water, performing ultrasonic dispersion for 2-3 hours to prepare a mixed fiber dispersion liquid, and performing suction filtration to obtain a mixed fiber skeleton;
(3) And adding the graphene oxide dispersion liquid into the mixed fiber framework, carrying out vacuum filtration, carrying out vacuum drying, heating to 800-820 ℃ under the condition of 30-35MPa and taking argon as protective gas, and carrying out heat preservation for 1.5-2h to obtain the graphene film (32).
3. The efficient heat dissipation film-coated color plate as claimed in claim 2, wherein in the step (2), modified multi-walled carbon nanotubes are further added to the mixed fiber dispersion, and the addition amount of the modified multi-walled carbon nanotubes is 20-40% of the total weight of the carbon fibers and the glass fibers.
4. The efficient heat dissipation film-coated color plate as claimed in claim 3, wherein the modified multi-walled carbon nanotubes are prepared by the following method:
dispersing 0.8-1 part by weight of multi-walled carbon nano-tube in 1.6-2 parts by weight of N-dimethyl pyrrolidone solution, adding 0.2-0.4 part by weight of silicon dioxide magnetic hollow microsphere and 0.05-0.1 part by weight of polyvinylidene fluoride, and carrying out ultrasonic treatment for 60-80min to obtain a dispersion liquid;
adding 0.5-1.2 parts by weight of chitosan into 1-3% of acetic acid solution, stirring and dissolving to obtain 3-5wt% of chitosan solution;
and mixing the chitosan solution and the dispersion liquid, stirring uniformly, washing with deionized water, and drying in vacuum.
5. The efficient heat dissipation film-coated color plate as claimed in claim 4, wherein in the step (2), rubidium magnets with opposite magnetic poles are arranged on two sides of the mixed fiber dispersion liquid, and after the fiber mixed dispersion liquid is stabilized under the action of a magnetic field, vacuum filtration is performed.
6. The color plate with high heat dissipation and film covering as claimed in claim 1, wherein the noise reduction film (5) is bonded between the thermal bonding layer (2) and the first chemical treatment layer (11) through hot melt adhesive, and the noise reduction film (5) is made by the following method:
ultrasonically cleaning a foamed nickel screen for 10-15min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 25-30 parts by weight of methylcellulose and 300-350 parts by weight of deionized water, adding 325-380 parts by weight of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking the foamed nickel net in the emulsion for 5-10min, taking out the foamed nickel net, preserving the temperature at 100-120 ℃ for 10-20min, heating to 450-480 ℃, preserving the temperature for 20-30min, and cooling to room temperature to prepare the noise reduction film (5).
7. The color plate with high heat dissipation efficiency as recited in claim 1, wherein the substrate (1) is one of galvanized, cold-rolled, and galvanized steel.
8. The preparation process of the high-efficiency heat-dissipation film-coated color plate as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
degreasing the surface of a substrate (1), soaking the substrate in a passivation solution, taking out the substrate and drying the substrate, and respectively forming a first chemical treatment layer (11) and a second chemical treatment layer (12) on two sides of the substrate (1);
coating a back paint on the surface of the second chemical treatment layer (12), and drying to form a back paint layer (4);
the hot melt adhesive is coated on the first chemical treatment layer (11), the temperature is raised for activation, the composite film layer (3) is pasted on the hot melt adhesive, the composite film sequentially comprises a PVC film (31), a graphene film (32) and a PET film (33), and the PVC film (31) is arranged on one side close to the hot melt adhesive.
9. The process for preparing the color plate with the film covering for the efficient heat dissipation according to claim 8, wherein the noise reduction film (5) is adhered between the thermal adhesion layer (2) and the first chemical treatment layer (11) through hot melt adhesive, and the noise reduction film (5) is prepared by the following method:
ultrasonically cleaning a foamed nickel screen for 10-15min by using acetone, ethanol and deionized water in sequence, and drying;
mixing 25-30 parts by weight of methylcellulose and 300-350 parts by weight of deionized water, adding 325-380 parts by weight of titanium dioxide sol, uniformly mixing to prepare emulsion, soaking the foamed nickel net in the emulsion for 5-10min, taking out the foamed nickel net, preserving the temperature at 100-120 ℃ for 10-20min, heating to 450-480 ℃, preserving the temperature for 20-30min, and cooling to room temperature to prepare the noise reduction film (5).
10. The preparation process of the high-efficiency heat-dissipation film-coated color plate as claimed in claim 8, wherein the composite film layer (3) is prepared by the following method: and (3) coating hot melt adhesive on two sides of the graphene film (32), heating and activating, and attaching the PVC film (31) and the PET film (33) on two sides of the graphene film (32).
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