CN112406213A - Continuous production method of highly oriented and high-thickness radiating fin and radiating fin - Google Patents

Continuous production method of highly oriented and high-thickness radiating fin and radiating fin Download PDF

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Publication number
CN112406213A
CN112406213A CN202011296997.1A CN202011296997A CN112406213A CN 112406213 A CN112406213 A CN 112406213A CN 202011296997 A CN202011296997 A CN 202011296997A CN 112406213 A CN112406213 A CN 112406213A
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radiating fin
foil
layer
thickness
film
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张妤甄
李晓燕
林怡君
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Xinhua Shanghai Equipment Co Ltd
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Xinhua Shanghai Equipment Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20409—Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

Abstract

The invention provides a continuous production method of a highly-oriented and high-thickness radiating fin, which forces fillers with low thermal resistance in a sizing material to be orderly arranged on a base material in a mode of applying the sizing material on a coiled heat-conducting base material under pressure, and ensures the heat conduction efficiency of the adhesive layer on the premise of ensuring the adhesive property; and then drying the adhesive layer, placing a heat-conducting laminating layer material, drying and rolling to improve the density of the radiating fin, so that the obtained radiating fin has higher thickness, higher density and high orientation, and the radiating efficiency of the radiating fin with the same thickness is greatly improved. The continuous production method of the highly-oriented and high-thickness radiating fins, provided by the invention, is simple to operate, can realize batch production and has high production efficiency; when the thickness of the obtained radiating fin is 40-500 mu m, the filler in the adhesive layer of the radiating fin can be highly oriented, and the radiating fin is ensured to have excellent heat conduction coefficient, electric conductivity, electromagnetic wave shielding and chemical stability.

Description

Continuous production method of highly oriented and high-thickness radiating fin and radiating fin
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a continuous production method of a highly-oriented, high-thickness and high-heat-dissipation heat dissipation fin and the obtained heat dissipation fin.
Background
The prevalence of 5G communication in the new century has become a major trend. Besides mobile phones, new-age industries such as cloud and data center construction, automatic driving, electric vehicles and the like are increasingly prevalent. With the continuous development of the technology, the power of electronic products is continuously increased, the products are thinner, and electronic instruments and equipment develop towards light, thin, short, small, composite and the like. Under the high-frequency working frequency, the heat generated by the electronic component is rapidly accumulated and increased, and the technical problem that the heat cannot be timely dissipated is increasingly shown. The graphite, graphene and composite material heat sink has many excellent heat dissipation characteristics, such as an artificial graphite film with a thermal conductivity as high as 1600W/mK and a density of about 1.6-1.9 g/cm3Meanwhile, it has the effects of flexibility, flexibility and electromagnetic wave shielding (EMI), and can satisfy the heat dissipation requirement of thin and high-functional mobile intelligent device.
At present, the mainstream radiating fin material is an artificial graphite film, the raw material of the artificial graphite film is a polyimide film (PI), the polyimide film is limited by the thickness of the polyimide raw material, and most artificial graphite films can only achieve the thickness of 40 micrometers and cannot meet the 5G communication radiating requirement. Thus, many of the prior art have adhered the substrate PET (polyethylene terephthalate) layer by means of an acrylic double-sided adhesive tape. Because the thermal resistance of the double-sided adhesive tape is high, the thermal conductivity coefficient is only 700 +/-100W/mK, the cost of finished product rate, labor and the like is considered, the cost of the multilayer laminated thick artificial graphite film is high, and the heat dissipation effect is greatly reduced. Therefore, it is desired to develop a heat sink with good thermal conductivity and thick specification at low cost, high quality and easy mass production.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a mass production method of a highly oriented and high heat dissipating heat sink with a thickness of 40 to 500 μm. The radiating fin obtained by the method provided by the invention has excellent conductivity coefficient, electric conductivity, electromagnetic shielding performance and chemical stability.
The object of the present invention is to provide a continuous process for producing highly oriented, high thickness heat sinks.
It is another object of the present invention to provide a highly oriented, high thickness heat sink obtained by the above production method.
The invention provides a continuous production method of a highly oriented and high-thickness radiating fin, which comprises the following steps:
(1) taking the coiled heat conduction material as a substrate layer, and then coating a sizing material on the substrate layer under pressure to obtain a glue layer; the sizing material comprises an adhesive and a filler, wherein the filler comprises one or more of natural graphite, artificial graphite, mesophase carbon, mesophase pitch, mesophase carbon microspheres, single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, multi-layered graphene, single-layered graphene, activated carbon, carbon black, silicon carbide, diamond powder, silver-palladium alloy, platinum, nickel, gold, aluminum, copper, silver, aluminum nitride, boron nitride, aluminum oxide, magnesium oxide, silicon dioxide and beryllium oxide; the particle size of the filler is less than 100 mu m;
(2) drying the adhesive layer in the step (1) until the solvent in the adhesive material is completely volatilized, then placing the rolled heat conduction material as an attaching layer, and applying 2-6 kg/cm to the attaching layer2Obtaining the prefabricated radiating fin by the attaching pressure;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming, and rolling to 80-99% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
The particle size of microspheres in the filler provided by the invention is less than 100 micrometers, the maximum length of fibers is less than 100 micrometers, and the number of layers of multilayer graphene is 10-30;
the mesocarbon microbeads provided by the present invention are microbeads having a particle size of less than 100 μm. The carbon content of the high carbon film in the materials of the base material layer and the laminating layer is higher than 97 percent.
According to the continuous production method of the radiating fin, the sizing material containing the low-heat-resistance filler is orderly arranged on the coiled heat-conducting base material in a mode of applying the sizing material on the coiled heat-conducting base material under pressure, so that the high orientation of the sizing material is ensured, the nematic sizing material is beneficial to reducing the heat resistance between the base material layer and the laminating layer after the heat-conducting laminating coiled material is placed after drying, meanwhile, the high heat conduction coefficients of the material of the radiating fin base material and the material of the laminating layer are maintained, the density of the prefabricated radiating fin after drying and rolling after laminating is improved, and the radiating fin obtained is ensured to have the characteristics of large thickness and high heat capacity.
Preferably, in step (1), the substrate comprises one of a high carbon film, a natural graphite film, an artificial graphite film, a graphene film, a single-walled carbon nanotube film, a multi-walled carbon nanotube film, a carbon fiber film, and a metal foil, wherein the metal foil comprises a copper foil, an aluminum foil, a silver foil, a gold foil, an iron foil, a titanium foil, a tin foil, a zinc foil, or an alloy foil thereof. The material of the base material layer and the material of the laminating layer of the radiating fin provided by the invention are both materials with higher heat conduction coefficients, and the thickness of the material of the base material layer and the thickness of the material of the laminating layer are not more than 250 micrometers.
Preferably, the pressure applied sizing comprises comma knife coating, spray coating or gravure coating; further preferably, the coating method includes slot die coating, slot die bead coating, open-edge roll coating, three-roll coating, reverse three-roll coating, five-roll coating, comma knife coating, reverse comma knife coating, micro gravure coating, reverse gravure coating, spray coating, dip coating, squeeze coating, ramp coating, dip coating, spray coating, dip coating, roll coating, dip,One or more of tension-controlled slit coating, tension-controlled roller coating, closed blade coating and novel D-bar coating. Preferably, in the step (1), the pressure of the pressure application sizing material is 1-4 kg/cm2. In the case of comma knife coating, the coating pressure is maintained at 1 to 4kg/cm2In such a pressure range, the filler in the sizing material can be well oriented, so that the sizing material layer is ensured to have lower thermal resistance, and the heat conduction performance of the radiating fin is prevented from being reduced by the sizing material layer.
Preferably, in step (1), the sizing material includes a binder and a filler, and the binder is one of a thermosetting binder, a thermoplastic binder and a rubber binder. More preferably, the thermosetting binder includes one of epoxy resins, urea-formaldehyde resins, melamine-formaldehyde resins, urea-formaldehyde resins, melaldehyde resins, phenol-formaldehyde resins, polyvinyl acetal-modified phenol-formaldehyde resins, polyamide-modified phenol-formaldehyde resins, epoxy-modified phenol-formaldehyde resins, silicone-modified phenol-formaldehyde resins, boron-modified phenol-formaldehyde resins, xylene-modified phenol-formaldehyde resins, diphenyl ether-formaldehyde resins, resorcinol-formaldehyde resins, polyurethanes, vinyl ester resins, oligoacrylates, diallyl phthalate, DKF resins, furan resins, PAI (polyamideimide) resins, polyphenylene ethers, PI resins, PEI resins, and unsaturated polyesters.
The thermoplastic adhesive comprises monomer substances such as ethyl acrylate, butyl acrylate, 2-octyl acrylate, isononyl acrylate, vinyl acetate, acrylonitrile, acrylamide, styrene, methyl methacrylate, methyl acrylate, acrylic acid, hydroxyl acrylate, ethyl acrylate, acrylamide, glycidyl methacrylate and the like or combinations thereof, ionomer, isobutylene maleic anhydride copolymer, acrylonitrile-propylene-styrene copolymer, acrylonitrile-ethylene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-chlorinated polyethylene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, ethylene-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl acetate, chlorothioethylene, chlorinated polyethylene, chlorinated polypropylene, carboxyvinyl polymer, ketone resin, norbornene resin, vinyl propionate, polyethylene, polypropylene, polymethylpentene, polybutadiene, polystyrene, styrene-maleic anhydride copolymer, isobutylene, ethylene-methacrylic acid copolymer, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl ether, polyvinyl butyral, polyvinyl formal, cellulose-based, nylon 6 copolymer, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, copolymerized nylon, nylon MXD, nylon 46, methoxymethylated nylon, aromatic polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyacetal, polyethylene oxide, polyvinyl acetate, polyvinyl chloride, polyvinyl alcohol, ketone resin, norbornene resin, polyvinyl propionate, polyvinyl chloride, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, cellulose-based, nylon 6 copolymer, nylon, Polyphenylene ether, modified polyphenylene ether, polyether ether ketone, polyether sulfone, polysulfone, polyamine sulfone, polyphenylene sulfide, polyarylate, polyvinylphenol, polymethylene styrene, polyallylamine, aromatic polyester, liquid crystal polymer, polytetrafluoroethylene, tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer, polyvinylidene fluoride series, polyvinyl fluoride, polyethylene naphthalate, and polyester series resin.
The rubber type adhesive comprises one of chloroprene rubber, nitrile rubber, styrene butadiene rubber, butyl rubber, polysulfide rubber, carboxyl rubber, organic silicon rubber and thermoplastic rubber.
Preferably, the preparation method of the rubber compound comprises the following steps: taking the adhesive, adding the filler, and fully mixing the filler and the adhesive under the action of high-speed shearing. The shearing pressure is below 30000psi, the rotating speed is between 100 rpm and 5000rpm, and the high-speed shearing time is 1-24 h. The adhesive layer provided by the invention adopts a material mixed by the adhesive and the filling material, and the filling material and the adhesive are uniformly mixed in a high-speed shearing mode, so that the uniformity and stability of the components of the obtained adhesive layer and the consistency of thermal resistance are ensured.
Preferably, in the step (1), the addition amount of the filler is 0.01 to 10 wt% of the weight of the binder. More preferably, in the step (1), the addition amount of the filler is 1 to 3 wt% of the weight of the binder. The filler in the sizing material provided by the invention is distributed in the adhesive according to the weight percentage, so that the heat conduction efficiency of the radiating fin is ensured. When the content of the filler is too low, the heat conduction efficiency of the obtained radiating fin is low, the content of the filler is 0-3 wt%, and the heat conduction efficiency is improved due to the characteristics that the density and the Z-axis heat conduction coefficient of the filler are increased along with the increase of the content of the filler. When the adding amount of the filler is more than 3 wt%, the filler in the sizing material layer begins to be arranged without fixed directionality, and further the heat conduction efficiency is influenced; the content of the filler is more than 10 wt%, the filler in the adhesive layer has no fixation directionality, and the heat conduction efficiency is greatly reduced.
Preferably, in the step (1), the solid content of the sizing material is 1-99 wt%.
Preferably, in the step (1), the sizing material is applied to the thickness of 1-200 μm. The thickness of the sizing material is one of important factors influencing the heat dissipation performance of the radiating fin, the coating thickness of the sizing material is 1-200 mu m, the directional arrangement of the fillers in the sizing material layer is ensured, and the heat conduction efficiency of the radiating fin is ensured.
Preferably, in step (2), the material of the adhesion layer includes one of a high carbon film, a natural graphite film, an artificial graphite film, a graphene film, a single-wall carbon nanotube film, a multi-wall carbon nanotube film, a carbon fiber film, and a metal foil, and the metal foil includes a copper foil, an aluminum foil, a silver foil, a gold foil, an iron foil, a titanium foil, a tin foil, a zinc foil, or an alloy foil thereof.
Preferably, in the step (2), after the material of the lamination layer is pressed, the method further comprises the following steps more than once: and applying a sizing material under pressure to obtain a glue layer, drying, placing the rolled heat conduction material as an attaching layer, and applying pressure to the attaching layer to obtain the prefabricated radiating fin. The production method provided by the invention can obtain the multi-layer attached radiating fin by repeatedly repeating the modes of pressure sizing, drying, placing the coiled heat conducting material as the attaching layer, applying pressure, pressure sizing, drying, placing the coiled heat conducting material as the attaching layer and applying pressure, thereby obtaining the radiating fin with the thickness of 40-500 mu m, and simultaneously ensuring the heat conduction efficiency of the radiating fin.
Preferably, in the step (3), the drying temperature is 25-150 ℃, and the drying time is 1-168 hours. In the step (3), drying under the above conditions can promote drying and curing of the sizing material, promote the sizing material to exert adhesive property, and ensure heat conduction efficiency.
Preferably, in the step (2) and the step (3), the drying mode is infrared irradiation, ultraviolet irradiation or hot air drying.
The invention provides the radiating fin obtained by the production method. Preferably, the thickness of the heat sink is 40 to 500 μm. When the thickness of the heat radiating fin provided by the invention takes the artificial graphite as the material layer and the material of the laminating layer, the heat conduction coefficient of more than 1500 +/-100W/mK and more than 2.0g/cm can still be displayed when the thickness exceeds 90 mu m3A physical density of more than 12000S/cm.
The invention has the beneficial effects that:
1. according to the continuous production method of the highly-oriented and high-thickness radiating fin, the filler with low thermal resistance in the rubber material is forced to be orderly arranged on the base material in a mode of applying the rubber material on the coiled heat-conducting base material under pressure, and the heat conduction efficiency of the rubber layer is ensured on the premise of ensuring the bonding performance; and then drying the adhesive layer, placing a heat-conducting laminating layer material, drying and rolling to improve the density of the radiating fin, so that the obtained radiating fin has higher thickness, higher density and high orientation, and the radiating efficiency of the radiating fin with the same thickness is greatly improved.
2. The continuous production method of the highly-oriented and high-thickness radiating fins, provided by the invention, is simple to operate, can realize batch production and has high production efficiency; when the thickness of the obtained radiating fin is 40-500 mu m, the filler in the adhesive layer of the radiating fin can be highly oriented, and the radiating fin is ensured to have excellent heat conduction coefficient, electric conductivity, electromagnetic wave shielding and chemical stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a heat sink according to example 4 of the present invention;
FIG. 2a is a schematic view of the coating and sizing method of example 4 of the present invention;
FIG. 2b is a schematic view showing the change of state of the filler during coating and sizing according to example 4 of the present invention;
FIG. 2c is a schematic view showing the states of the substrate layer and the adhesive layer obtained after step (1) in example 4 of the present invention;
FIG. 3 is a schematic view of a polarizing microscope showing states of different contents of fillers in a glue layer;
FIG. 4 is a graph showing the thermal conductivity and heat dissipation of a heat sink coated with different filler loadings of the sizing composition;
FIG. 5 is a graph of the heat transfer coefficient of different prior art fins versus fins of different thicknesses of the present invention;
fig. 6 is a graph comparing the heat dissipation efficiency of different heat sinks of the prior art with heat sinks of different thicknesses of the present invention.
Figure 1, comma doctor blade; 2. a substrate; 3. a filler; 4. a filler having a nematic alignment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The rubber material used in the embodiment of the invention is prepared by the following method: adding a filler into the adhesive, wherein the shearing pressure is below 30000psi, the rotating speed is 100-5000 rpm, and the high-speed shearing time is 1-24 hours, so that the filler and the adhesive are fully mixed to obtain the adhesive.
Example 1
A method for continuous production of highly oriented, high thickness heat sinks comprising the steps of:
(1) taking a coiled graphene film as a substrate layer, and then coating the substrate layer with a comma knife at a rate of 1kg/cm2Applying a sizing material under the pressure to obtain a glue layer;
the thickness of the glue layer is 40 μm,
the solids content of the size is 50% by weight,
the sizing material comprises a binding agent and a filling material, wherein the binding agent is polyethylene in a thermoplastic binding agent,
the filler is alumina, and the particle size of the alumina is less than 100 μm;
the addition amount of the filler is 10 wt% of the weight of the adhesive;
(2) drying the adhesive layer in the step (1) by adopting an infrared irradiation mode, irradiating for 2min by using a 0.5kw infrared lamp tube until the solvent in the adhesive material is completely volatilized, then placing the rolled graphene film as an attaching layer, and applying 2kg/cm to the attaching layer2Obtaining the prefabricated radiating fin by the attaching pressure;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming the prefabricated radiating fin at the drying temperature of 150 ℃ for 168h, and rolling the prefabricated radiating fin to 90% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
Example 2
A method for continuous production of highly oriented, high thickness heat sinks comprising the steps of:
(1) taking a coiled copper foil as a substrate layer, and coating the substrate layer with a reverse three-roller coating mode at a speed of 4kg/cm2Applying a sizing material under the pressure to obtain a glue layer;
the thickness of the glue layer is 1 μm,
the solids content of the size is 99% by weight,
the sizing material comprises a bonding agent and a filling material, wherein the bonding agent is acrylic acid in a thermoplastic bonding agent,
the filler is mesocarbon microbeads, and the particle size of the mesocarbon microbeads is less than 100 microns;
the addition amount of the filler is 0.01 wt% of the weight of the adhesive;
(2) drying the adhesive layer in the step (1) by adopting an infrared irradiation mode, irradiating for 10s by using a 0.5kw infrared lamp tube until the solvent in the adhesive material is completely volatilized, then placing the rolled copper foil as an adhesive layer, and applying 6kg/cm to the adhesive layer2Obtaining the prefabricated radiating fin by the attaching pressure;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming the prefabricated radiating fin at the drying temperature of 25 ℃ for 1h, and rolling the prefabricated radiating fin to 99% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
Example 3
A method for continuous production of highly oriented, high thickness heat sinks comprising the steps of:
(1) taking a coiled graphene film as a substrate layer, and coating the substrate layer with an opening-pressing winding opening at a speed of 2kg/cm2Applying a sizing material under the pressure to obtain a glue layer;
the thickness of the glue layer is 200 μm,
the solids content of the size is 1% by weight,
the sizing material comprises an adhesive and a filling material, wherein the adhesive is polyurethane in a thermoplastic adhesive,
the filler is a single-walled carbon nanotube, the diameter of the single-walled carbon nanotube is 1-3 nm, and the length of the single-walled carbon nanotube is 5-30 μm;
the addition amount of the filler is 3 wt% of the weight of the adhesive;
(2) drying the adhesive layer in the step (1) by adopting an infrared irradiation mode, irradiating for 5min by using a 0.5kw infrared lamp tube until the solvent in the adhesive material is completely volatilized, then placing the rolled graphene film as an attaching layer, and applying 4kg/cm to the attaching layer2Applying pressure of (2) to obtainPreparing a radiating fin;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming the prefabricated radiating fin at the drying temperature of 50 ℃ for 96 hours, and rolling the prefabricated radiating fin to 80% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
Example 4
A method for continuous production of highly oriented, high thickness heat sinks comprising the steps of:
(1) taking a roll-shaped artificial graphite film as a substrate layer, and then coating the substrate layer with a comma knife at a rate of 2kg/cm2Applying a sizing material under pressure to obtain a first sizing layer;
the thickness of the glue layer is 15 μm,
the solids content of the size was 55 wt%,
the sizing material comprises a bonding agent and a filling material, wherein the bonding agent is acrylic acid in a thermoplastic bonding agent,
the filler is multilayer graphene, the number of layers of the multilayer graphene is 10-30, the thickness of the multilayer graphene is 3-10 nm, and the maximum length of the multilayer graphene is 1-20 microns;
the addition amount of the filler is 1 wt% of the weight of the adhesive;
(2) drying the first adhesive layer in the step (1) by adopting an infrared irradiation mode, irradiating for 30s by using a 0.5kw infrared lamp tube until the solvent in the adhesive material is completely volatilized, then placing a rolled artificial graphite film as a first adhesive layer, and applying 3kg/cm to the first adhesive layer2Applying a sizing material under pressure to obtain a second glue layer, drying, placing a rolled artificial graphite film as a second laminating layer, and applying 3kg/cm to the second laminating layer2Obtaining the prefabricated radiating fin by the attaching pressure;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming the prefabricated radiating fin at the drying temperature of 45 ℃ for 48h, and rolling the prefabricated radiating fin to 85% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
The structure of the heat sink obtained in this example is shown in fig. 1.
The coating and sizing method of this embodiment is shown in FIG. 2 a.
The change of the state of the filler during the coating and sizing of this embodiment is shown in FIG. 2 b.
The state of the substrate layer and the glue layer obtained after step (1) of this example is shown in fig. 2 c.
Example 5
A highly oriented, high thickness heat sink sheet continuously produced in the same manner as in example 4, except that the filler is added in an amount of 2 wt% based on the weight of the binder in step (1).
Example 6
A highly oriented, high thickness heat sink sheet continuously produced in the same manner as in example 4 except that the filler is added in an amount of 3 wt% based on the weight of the binder in step (1).
Example 7
A highly oriented, high thickness heat sink sheet continuously produced in the same manner as in example 4 except that in step (1), the filler is added in an amount of 4 wt% based on the weight of the binder.
Example 8
A highly oriented, high thickness heat sink sheet continuously produced in the same manner as in example 4 except that in step (1), the filler is added in an amount of 5 wt% based on the weight of the binder.
Examples of the experiments
1. Effect of Filler content on Heat transfer efficiency
1.1 sizing materials containing 1 wt%, 2 wt%, 3 wt%, 4 wt% and 5 wt% of filling material multi-layer graphene (the number of the multi-layer graphene is 10-30, the thickness is 3-10 nm, and the maximum length is 1-20 mu m) are respectively adopted to be in a comma scraper type mode at 2kg/cm2Is applied to the base artificial graphite film, dried, and then the state of the filler in the adhesive layer is observed under a polarizing microscope. The results are shown in FIG. 3.
As can be seen from the results of fig. 3, when the content of the filler in the size is less than 3 wt%, the molecular orientation of the filler is higher as the content of the filler increases, and when the content of the filler exceeds 3 wt%, the molecular alignment starts to be non-aligned, and the molecular orientation is deteriorated.
1.2 the heat transfer coefficients of the heat dissipation sheets obtained in the embodiments 4 to 8 were respectively tested, the heat dissipation sheets were attached to the same heat source, and after the heat source was provided for 6min, a thermal imaging chart was taken with a thermal imager, the temperature difference between the heat dissipation sheet and the heat source was calculated, and the heat dissipation efficiency was calculated. The results of the heat transfer coefficient test and the heat dissipation efficiency are shown in fig. 4.
As can be seen from the results shown in fig. 4, the addition of the filler in the heat sink provided by the present invention greatly improves the heat conductivity and heat dissipation efficiency of the heat sink. When the amount of the filler added is 0 to 3 wt%, the thermal conductivity increases as the proportion of the filler increases, because the filler exerts the characteristics of increasing density and Z-axis thermal conductivity. However, when the filler is added in an amount exceeding 3 wt%, the molecular alignment starts to have no fixed nematic alignment, thereby affecting the heat conduction efficiency.
2. The performance of the heat sink sheet obtained in example 6 of the present invention and the artificial graphite film heat sink sheet of the prior art manufactured by Panasonic corporation under the trade name PGS-100 were tested, and the results are shown in table 1.
Table 1 comparison of the properties of the heat sink obtained in example 6 and the prior art
Figure BDA0002785700170000111
Figure BDA0002785700170000121
The results in table 1 show that the artificial graphite film is used as the substrate layer and the laminating layer, the pressure bonding is performed by using the sizing material containing the heat-conducting filler and the adhesive, the thickness of the obtained radiating fin is about 90 μm, the density of the radiating fin is higher than that of the artificial graphite film radiating fin with the same thickness in the prior art, the heat diffusion value is doubled, the heat conduction coefficient is increased from the original 700 +/-100W/mk to 1500 +/-100W/mk, and the heat conduction coefficient is greatly improved; the conductivity is effectively improved.
3. Comparison of thermal conduction efficiency of different heat dissipation film materials
3.1 get the 90 μm thick copper foil, 90 μm thick aluminum foil, 200 μm thick silicon nitride film, the prior art uses acrylic double-sided adhesive to bond the substrate layer by layer to get 90 μm thick artificial graphite film heat sink and the application of the method of example 4 to get different thickness artificial graphite film heat sink, and the results are shown in figure 5. Wherein PGS-90 is a heat sink having a thickness of 90 μm obtained in the prior art, X-40 is a heat sink having a thickness of 40 μm obtained by adjusting the number of layers of adhesive layers by the method of embodiment 4 of the present invention, X-70 is a heat sink having a thickness of 70 μm obtained by adjusting the number of layers of adhesive layers by the method of embodiment 4 of the present invention, and X-90 is a heat sink having a thickness of 90 μm obtained by adjusting the number of layers of adhesive layers by the method of embodiment 4 of the present invention.
As can be seen from the results of fig. 5, the heat transfer coefficient of the heat sink provided by the present invention is greatly improved compared to the heat sink with the same thickness obtained by the method in the prior art; the heat conduction coefficient of the radiating fin provided by the invention is obviously better than that of a metal radiating fin, and the reduction degree of the heat conduction coefficient of the radiating fin provided by the invention is not obvious along with the increase of the thickness.
3.2 taking different radiating fins in the prior art and radiating fins obtained by adopting the method of the embodiment of the invention to be respectively attached to the same heat source, taking a thermal imaging picture by adopting a thermal imaging camera after the heat source is provided for 6min, observing the temperature difference between different products and the heat source, and calculating the radiating efficiency, wherein the result is shown in figure 6. Taking a blank group as a comparison, wherein the blank group has no radiating fins; the thickness of the copper foil is 90 μm; among them, PGS-90 is a 90 μm thick artificial graphite film heat sink sheet obtained by the prior art in which base materials are bonded one by one using an acrylic double-sided adhesive, X-40 is a 40 μm thick heat sink sheet obtained by adjusting the number of lamination layers by the method of the present invention example 4, X-70 is a 70 μm thick heat sink sheet obtained by adjusting the number of lamination layers by the method of the present invention example 4, and X-90 is a 90 μm thick heat sink sheet obtained by adjusting the number of lamination layers by the method of the present invention example 4.
As can be seen from the results of fig. 6, the heat dissipation efficiency of the heat sink obtained by the present invention is significantly better than that of the copper foil; compared with the artificial graphite film radiating fin with the same thickness and obtained by adopting the prior art, the artificial graphite film radiating fin provided by the invention has obviously higher radiating efficiency; the radiating efficiency of the radiating fin provided by the invention is increased along with the increase of the thickness.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A method for continuously producing highly oriented, high thickness heat sinks comprising the steps of:
(1) taking the coiled heat conduction material as a substrate layer, and then coating a sizing material on the substrate layer under pressure to obtain a glue layer; the sizing material comprises an adhesive and a filler, wherein the filler comprises one or more of natural graphite, artificial graphite, mesophase carbon, mesophase pitch, mesophase carbon microspheres, single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, multi-layered graphene, single-layered graphene, activated carbon, carbon black, silicon carbide, diamond powder, silver-palladium alloy, platinum, nickel, gold, aluminum, copper, silver, aluminum nitride, boron nitride, aluminum oxide, magnesium oxide, silicon dioxide and beryllium oxide; the particle size of the filler is less than 100 mu m;
(2) drying the adhesive layer in the step (1) until the solvent in the adhesive material is completely volatilized, then placing the rolled heat conduction material as an attaching layer, and applying 2-6 kg/cm to the attaching layer2Obtaining the prefabricated radiating fin by the attaching pressure;
(3) and (3) drying the prefabricated radiating fin obtained in the step (2), trimming, and rolling to 80-99% of the thickness of the prefabricated radiating fin to obtain the radiating fin.
2. The continuous production method of a highly oriented, high thickness heat sink as claimed in claim 1, wherein in step (1), the material of the substrate layer comprises one of a high carbon film, a natural graphite film, an artificial graphite film, a graphene film, a single-walled carbon nanotube film, a multi-walled carbon nanotube film, a carbon fiber film, and a metal foil comprising a copper foil, an aluminum foil, a silver foil, a gold foil, an iron foil, a titanium foil, a tin foil, a zinc foil, or an alloy foil thereof.
3. A method for continuously producing a highly oriented, high thickness heat sink sheet according to claim 1, wherein in step (1), the adhesive is one of a thermosetting adhesive, a thermoplastic adhesive, and a rubber adhesive.
4. A method for continuously producing a highly oriented, high thickness heat sink as claimed in claim 1, wherein in the step (1), the filler is added in an amount of 0.01 to 10 wt% based on the weight of the binder.
5. A continuous process for producing a highly oriented, high thickness heat sink as claimed in claim 1, wherein in step (1), the solids content of the size is 1 to 99 wt%.
6. A continuous process for producing a highly oriented, high thickness heat sink as claimed in claim 1, wherein in step (1), the sizing is applied to a thickness of 1 to 200 μm.
7. The continuous production method of a highly oriented, high thickness heat spreader as claimed in claim 1, wherein in step (2), the material of the adhesion layer comprises one of a high carbon film, a natural graphite film, an artificial graphite film, a graphene film, a single-walled carbon nanotube film, a multi-walled carbon nanotube film, a carbon fiber film, and a metal foil, and the metal foil comprises a copper foil, an aluminum foil, a silver foil, a gold foil, an iron foil, a titanium foil, a tin foil, a zinc foil, or an alloy foil thereof.
8. A method for continuously producing a highly oriented, high thickness heat spreader as claimed in claim 1, wherein the step (2) further comprises the following steps after the applying pressure to the attached layer: and applying a sizing material under pressure to obtain a glue layer, drying, placing the rolled heat conduction material as an attaching layer, and applying pressure to the attaching layer to obtain the prefabricated radiating fin.
9. A method for continuously producing a highly oriented, high thickness heat sink as claimed in claim 1, wherein in the step (3), the drying temperature is 25 to 150 ℃ and the drying time is 1 to 168 hours.
10. A heat sink sheet obtained by the production process as claimed in any one of claims 1 to 9.
CN202011296997.1A 2020-11-18 2020-11-18 Continuous production method of highly oriented and high-thickness radiating fin and radiating fin Pending CN112406213A (en)

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