CN115648762A - Heat-conducting and electric-conducting film and preparation method thereof - Google Patents
Heat-conducting and electric-conducting film and preparation method thereof Download PDFInfo
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- CN115648762A CN115648762A CN202211440710.7A CN202211440710A CN115648762A CN 115648762 A CN115648762 A CN 115648762A CN 202211440710 A CN202211440710 A CN 202211440710A CN 115648762 A CN115648762 A CN 115648762A
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Abstract
The invention provides a heat-conducting and electric-conducting film which sequentially comprises a first graphite heat dissipation layer, a heat-conducting and electric-conducting layer and a second graphite heat dissipation layer; the heat and electricity conducting layer comprises the following raw materials in parts by weight: 64-76 parts of acrylic adhesive; 16-24 parts of micron or nano carbon-based powder; 8-12 parts of micron or nano metal powder; 1-3 parts of a coupling agent. The invention also provides a preparation method of the heat-conducting and electric-conducting film. According to the heat and electricity conducting film, the heat and electricity conducting layer is arranged, and the composition and the proportion of the raw materials of the heat and electricity conducting layer are limited, so that the electric conductivity of the heat and electricity conducting layer is larger than 40000s/cm, and the heat conductivity of the heat and electricity conducting layer is larger than 1300 w/m.K, and further the heat conductivity of the heat and electricity conducting film can be improved on the premise of ensuring the excellent electric conductivity of the heat and electricity conducting film.
Description
Technical Field
The invention relates to the technical field of films, in particular to a heat-conducting and electric-conducting film and a preparation method thereof.
Background
In the applied electronic product industry, such as the fixation of flexible circuits or frames in mobile phones, notebook computers, tablet computers, digital cameras and the like, a common PET heat-conducting and electric-conducting adhesive film material is usually adopted, the cornea material has high thermal impedance (more than 30 percent) and thermal conductivity of 600-800w/m.k, and does not have good heat-conducting, electric-conducting, heat-dissipating and shielding functions (the thermal conductivity is 600-800 w/m.k), so the heat-dissipating and heat-treating performance of electronic products is influenced.
In circuit design requiring insulation or heat insulation, a back film treatment is usually performed on the surface of a heat conducting material, so as to perform multi-level superposition application of the back adhesive and the back film, for example, a 0.01MM double-sided adhesive and a 0.01MM PET film are adopted to optimize the product performance for the purpose of conducting heat more quickly and adapting to a narrow design space better.
The electric conduction and heat conduction composite adhesive film applied to the current electronic product is generally made by coating hot melt adhesive on two sides of a PET (polyethylene terephthalate) substrate, and basically forms a heat dissipation effect according to composite heat conduction graphene or carbon fiber materials.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a heat and electricity conducting film, which can improve the heat conductivity of the heat and electricity conducting film on the premise of ensuring the excellent electric conductivity of the heat and electricity conducting film.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
The invention provides a heat-conducting and electric-conducting film which sequentially comprises a first graphite heat dissipation layer, a heat-conducting and electric-conducting layer and a second graphite heat dissipation layer; wherein the content of the first and second substances,
the heat and electricity conducting layer comprises the following raw materials in parts by weight:
preferably, the carbon-based powder is selected from at least one of graphene powder and carbon fiber powder.
Preferably, the graphene powder has a particle size of 7 to 12 μm and a number of layers of 1 to 10.
Preferably, the carbon fiber powder has a particle size of 6 to 8 μm and a mesh number of 450 to 550 mesh.
Preferably, the metal powder is nickel powder, and the particle size of the nickel powder is 8-15 mu m and the mesh number of the nickel powder is 450-550 meshes.
Preferably, the solid content of the acrylic adhesive is 35-45%.
Preferably, the coupling agent is selected from at least one of a chromium complex coupling agent, a silane coupling agent, a titanate coupling agent, and a tin-based coupling agent.
Preferably, the thickness of the heat and electricity conducting layer is 9-12 μm, and the thickness of the first graphite heat dissipation layer and the second graphite heat dissipation layer is 65-75 μm.
The invention also provides a method for preparing the heat-conducting and electric-conducting film, which is characterized by comprising the following steps:
s1, weighing raw materials of the heat and electricity conducting layer according to the measurement, and reacting under uniform stirring to obtain the heat and electricity conducting coating;
s2, coating the heat and electricity conducting coating on one surface of a release film layer, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer;
and S3, tearing off the release film layer, and respectively compounding a first graphite heat dissipation layer and a second graphite heat dissipation layer on the two surfaces of the heat and electricity conduction layer to obtain the heat and electricity conduction film.
Preferably, in the step S1, the stirring speed is 300-600rpm/min, and the stirring time is 1-3h; in step S2, the curing temperature is 80-120 ℃, and the curing time is 10-15min.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a heat and electricity conducting film, which is characterized in that the heat and electricity conducting layer is arranged, and the composition and the proportion of raw materials of the heat and electricity conducting layer are limited, so that the electric conductivity of the heat and electricity conducting layer is larger than 40000s/cm, the heat conductivity is larger than 1300 w/m.K, and the heat conductivity of the heat and electricity conducting film can be improved on the premise of ensuring the excellent electric conductivity of the heat and electricity conducting film.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented according to the content of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a structural cross-sectional view of a thermally and electrically conductive film of the present invention;
fig. 2 is a flowchart illustrating steps of a method for manufacturing a thermally and electrically conductive film according to the present invention.
In the figure:
10. a thermally and electrically conductive film; 1. a first graphite heat dissipation layer; 2. a thermally and electrically conductive layer; 3. a second graphite heat dissipation layer.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, which will enable those skilled in the art to practice the present invention with reference to the accompanying specification. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention provides a heat-conducting and electric-conducting film, as shown in fig. 1, the heat-conducting and electric-conducting film 10 sequentially comprises a first graphite heat dissipation layer 1, a heat-conducting and electric-conducting layer 2 and a second graphite heat dissipation layer 3; wherein, the first and the second end of the pipe are connected with each other,
the heat and electricity conducting layer 2 comprises the following raw materials in parts by weight:
in this embodiment, in the thermal and electrical conductive film 10 provided by the present invention, by providing the thermal and electrical conductive layer 2 and limiting the composition and ratio of the raw materials of the thermal and electrical conductive layer 2, the electrical conductivity of the thermal and electrical conductive layer 2 is greater than 40000s/cm, and the thermal conductivity is greater than 1300w/m · K, so that the thermal conductivity of the thermal and electrical conductive film 10 can be improved on the premise of ensuring the excellent electrical conductivity of the thermal and electrical conductive film 10.
In one embodiment, the carbon-based powder is at least one selected from graphene powder and carbon fiber powder, has good electrical conductivity and thermal conductivity, has good atmospheric corrosion resistance, and is easy to die-cut.
Further, when the carbon-based powder is graphene powder, the graphene powder has a particle size of 7-12 μm and the number of layers is 1-10.
Further, when the carbon-based powder is a carbon fiber powder, the carbon fiber powder has a particle size of 6 to 8 μm and a mesh number of 450 to 550 mesh. Preferably, the carbon fiber powder has a particle size of 7 μm and a mesh number of 500.
In one embodiment, the metal powder is nickel powder, has good electrical conductivity and thermal conductivity, has good atmospheric corrosion resistance, and is easy to die-cut and mold. The metal powder has a particle size of 8-15 μm and a mesh number of 450-550 mesh. Preferably, the mesh number of the metal powder is 500 mesh.
In one embodiment, the acrylic adhesive has a solids content of 35% to 45%.
In one embodiment, the coupling agent is selected from at least one of a chromium complex coupling agent, a silane coupling agent, a titanate coupling agent, and a tin-based coupling agent.
In one embodiment, the thickness of the heat and electricity conducting layer 2 is 9-12 μm, and the thickness of the first graphite heat dissipation layer 1 and the second graphite heat dissipation layer 3 is 65-75 μm. Preferably, the thickness of the heat and electricity conducting layer 2 is 10 μm, and the thickness of the first graphite heat dissipation layer 1 and the second graphite heat dissipation layer 3 is 70 μm.
The invention also provides a method for preparing the heat-conducting and electric-conducting film, which comprises the following steps as shown in fig. 2:
s1, weighing raw materials of a heat-conducting and electricity-conducting layer according to a certain amount, and reacting under uniform stirring to obtain a heat-conducting and electricity-conducting coating;
s2, coating the heat and electricity conducting coating on one surface of a release film layer, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer 2;
and S3, tearing off the release film layer, and respectively compounding a first graphite heat dissipation layer 1 and a second graphite heat dissipation layer 3 on two surfaces of the heat and electricity conduction layer 2 to obtain the heat and electricity conduction film.
Further, in the step S1, the stirring speed is 300-600rpm/min, and the stirring time is 1-3h; in the step S2, the curing temperature is 80-120 ℃, and the curing time is 10-15min.
Further, in step S2, the release film layer is a PET release film with a thickness of 25 μm.
The method of the present invention is illustrated below by means of specific examples, which are to be understood as being illustrative of the basic principles, essential features and advantages of the invention, without limiting the scope of the invention by the following examples; the implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not noted are generally those in routine experiments.
Example 1
The invention provides a heat-conducting and electric-conducting film, which is prepared by the following steps:
(1) Weighing 64Kg of acrylic acid adhesive (type TA85A 02), 24Kg of carbon-based powder (G0 powder, particle size of 7 μm and mesh number of 500), 10Kg of metal powder (N10 powder, particle size of 10 μm and mesh number of 500) and 2Kg of silane coupling agent according to the measurement, and uniformly stirring at 380rpm/min for 1.5h to obtain the heat and electricity conducting coating;
(2) Coating the heat and electricity conducting coating on one surface of a release film layer (the model is 25T 00), drying at 120 ℃ for 10min, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer 2, wherein the thickness of the heat and electricity conducting layer 2 is 10 microns;
(3) Tear from the type rete compound first graphite heat dissipation layer 1 (the model is GST70, and thickness is 70 μm) and second graphite heat dissipation layer 3 (the model is GST70, and thickness is 70 μm) respectively on the two surfaces of heat conduction layer 2, make heat conduction electric thin film.
In this example, the thickness of the prepared thermal and electrical conductive film 10 was 150 μm, the thermal conductivity was 1400 w/m.K, and the electrical conductivity was 45000s/cm.
Example 2
The invention provides a heat-conducting and electric-conducting film, which is prepared by the following steps:
(1) Weighing 75Kg of acrylic acid adhesive (type TA85A 02), 16Kg of carbon-based powder (G0 powder, particle size of 7 μm and mesh number of 500), 8Kg of metal powder (N10 powder, particle size of 10 μm and mesh number of 500) and 1Kg of silane coupling agent according to the measurement, uniformly stirring at 550rpm/min for 1.5h, and reacting to obtain the heat and electricity conducting coating;
(2) Coating the heat and electricity conducting coating on one surface of a release film layer (the model is 25T 00), drying for 15min at 80 ℃, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer 2, wherein the thickness of the heat and electricity conducting layer 2 is 10 microns;
(3) Tear from the type rete compound first graphite heat dissipation layer 1 (the model is GST70, and thickness is 70 μm) and second graphite heat dissipation layer 3 (the model is GST70, and thickness is 70 μm) respectively on the two surfaces of heat conduction layer 2, make heat conduction electric thin film.
In this embodiment, the thickness of the prepared thermal and electrical conductive film 10 is 150 μm, the thermal conductivity is 1300 w/m.K, and the electrical conductivity reaches 35000s/cm.
Example 3
The invention provides a heat-conducting and electric-conducting film, which is prepared by the following steps:
(1) Weighing 70Kg of acrylic adhesive (type TA85A 02), 20Kg of carbon-based powder (G0 powder, particle size of 7 μm and mesh number of 500), 8Kg of metal powder (N10 powder, particle size of 10 μm and mesh number of 500) and 2Kg of silane coupling agent according to the measurement, uniformly stirring at 450rpm/min for 1.5h, and reacting to obtain the heat and electricity conducting coating;
(2) Coating the heat and electricity conducting paint on one surface of a release film layer (the model is 25T 00), drying at 105 ℃ for 12min, and curing the heat and electricity conducting paint to form a heat and electricity conducting layer 2, wherein the thickness of the heat and electricity conducting layer 2 is 10 microns;
(3) Tear the release film layer two surfaces of heat-conducting layer 2 are respectively compounded first graphite heat dissipation layer 1 (the model is GST70, and thickness is 70 μm) and second graphite heat dissipation layer 3 (the model is GST70, and thickness is 70 μm), and the heat-conducting and electric-conducting film is prepared.
In this example, the obtained thermally and electrically conductive film 10 had a thickness of 150 μm, a thermal conductivity of 1350 w/m.K and an electrical conductivity of 40000s/cm.
Example 4
The invention provides a heat-conducting and electric-conducting film, which is prepared by the following steps:
(1) Weighing 68Kg of acrylic acid adhesive (type: TA85A 02), 18Kg of carbon-based powder (G0 powder, particle size of 7 μm, mesh number of 500 meshes), 12Kg of metal powder (N10 powder, particle size of 10 μm, mesh number of 500 meshes) and 2Kg of silane coupling agent according to the measurement, and uniformly stirring at 300rpm/min for 1.5h to obtain the heat and electricity conducting coating;
(2) Coating the heat and electricity conducting coating on one surface of a release film layer (the model is 25T 00), drying for 14min at 95 ℃, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer 2, wherein the thickness of the heat and electricity conducting layer 2 is 10 microns;
(3) Tear the release film layer two surfaces of heat-conducting layer 2 are respectively compounded first graphite heat dissipation layer 1 (the model is GST70, and thickness is 70 μm) and second graphite heat dissipation layer 3 (the model is GST70, and thickness is 70 μm), and the heat-conducting and electric-conducting film is prepared.
In this example, the thickness of the obtained thermal and electrical conductive film 10 was 150 μm, the thermal conductivity was 1250 w/m.K, and the electrical conductivity reached 40000s/cm.
According to the heat and electricity conducting film 10 provided by the invention, the heat and electricity conducting layer 2 is respectively compounded with the first graphite heat dissipation layer 1 and the second graphite heat dissipation layer 3, and the components and the proportion of the raw materials of the heat and electricity conducting layer 2 are limited, so that the prepared heat and electricity conducting film 10 has good heat conductivity and electric conductivity while protecting electronic products.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A heat-conducting and electric-conducting film is characterized by sequentially comprising a first graphite heat dissipation layer (1), a heat-conducting and electric-conducting layer (2) and a second graphite heat dissipation layer (3); wherein, the first and the second end of the pipe are connected with each other,
the heat and electricity conducting layer (2) comprises the following raw materials in parts by weight:
2. the thermally and electrically conductive film according to claim 1, wherein the carbon-based powder is at least one selected from graphene powder and carbon fiber powder.
3. A heat and electricity conductive film according to claim 2, wherein the graphene powder has a particle size of 7-12 μm and a number of layers of 1-10.
4. A heat and electricity conductive film according to claim 2, wherein said carbon fiber powder has a particle size of 6-8 μm and a mesh number of 450-550 mesh.
5. A heat and electricity conductive film according to claim 1 wherein said metal powder is nickel powder having a particle size of 8-15 μm and a mesh size of 450-550 mesh.
6. A heat and electricity conductive film as claimed in claim 1, wherein said acrylic adhesive has a solid content of 35% to 45%.
7. A thermally and electrically conductive film according to claim 1, wherein said coupling agent is at least one selected from the group consisting of a chromium complex coupling agent, a silane coupling agent, a titanate coupling agent, and a tin coupling agent.
8. A thermally and electrically conductive film according to claim 1, wherein said thermally and electrically conductive layer (2) has a thickness of 9-12 μm, and said first graphite heat sink layer (1) and said second graphite heat sink layer (3) have a thickness of 65-75 μm.
9. A method for preparing a thermally and electrically conductive film according to any one of claims 1 to 8, comprising the steps of:
s1, weighing raw materials of the heat and electricity conducting layer according to the measurement, and reacting under uniform stirring to obtain the heat and electricity conducting coating;
s2, coating the heat and electricity conducting coating on one surface of a release film layer, and curing the heat and electricity conducting coating to form a heat and electricity conducting layer (2);
and S3, tearing off the release film layer, and respectively compounding a first graphite heat dissipation layer (1) and a second graphite heat dissipation layer (3) on two surfaces of the heat and electricity conduction layer (2) to obtain the heat and electricity conduction film.
10. The method according to claim 9, wherein in step S1, the stirring speed is 300-600rpm/min, and the stirring time is 1-3h; in step S2, the curing temperature is 80-120 ℃, and the curing time is 10-15min.
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| CN202211440710.7A CN115648762A (en) | 2022-11-17 | 2022-11-17 | Heat-conducting and electric-conducting film and preparation method thereof |
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| CN202211440710.7A CN115648762A (en) | 2022-11-17 | 2022-11-17 | Heat-conducting and electric-conducting film and preparation method thereof |
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