A preparation method of a novel heat diffusion composite sheet

Abstract

The invention discloses a preparation method of a novel heat diffusion composite sheet material, the heat diffusion composite sheet material comprises an upper insulating layer, a heat diffusion layer, a lower insulating layer and a protective film, the lower surface of the heat diffusion layer is provided with a lower insulating layer, the upper surface and surrounding areas of the heat diffusion layer are provided with an upper insulating layer, and the bottoms of the upper insulating layer and the lower insulating layer are both arranged on the upper surface of the protective film; a surface modification treatment agent is coated on the surface of the heat diffusion layer; a lower insulating layer is bonded or coated on one side of the heat diffusion layer; a set of A plate cutting dies, B plate cutting dies and C plate for punching holes are designed and arranged; the A plate cutting die is hung on a die-cutting machine to punch out products, and positioning holes on the protective film are punched out at the same time; the punched products and the protective film with punched holes are placed in the middle of a PET film; the invention uses a specific process to wrap a layer of insulating layer around the heat diffusion layer 2, and a protective film is also arranged on the outside, thereby improving the insulation performance of the heat diffusion sheet material, allowing users to use it more safely and with more stable product performance.

Description

Technical Field

[0001] The invention relates to the technical field of heat diffusion materials, in particular to a method for preparing a novel heat diffusion composite sheet. Background Art

[0002] The heat diffusion composite sheet on the market is generally formed by laminating tape or covering the surface of the heat diffusion sheet with adhesive. At present, the materials with good thermal diffusion coefficient are generally conductive materials, such as graphite sheets, copper foil and other materials. After punching, the exposed part of the cross section is easy to conduct electricity, which is easy to cause creepage and affect the use. Therefore, it is very necessary to design a new preparation method of heat diffusion composite sheet to solve the above problem. Summary of the invention

[0003] The purpose of the present invention is to provide a novel method for preparing a heat diffusion composite sheet to solve the above-mentioned background

[0004] Questions raised in technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a new type of heat diffusion composite sheet, comprising an upper insulating layer, a heat diffusion layer, a lower insulating layer and a protective film, wherein the lower surface of the heat diffusion layer has a lower insulating layer, the upper surface and surrounding areas of the heat diffusion layer have an upper insulating layer, and the bottoms of the upper insulating layer and the lower insulating layer are both arranged on the upper surface of the protective film.

[0006] A method for preparing a novel heat diffusion composite sheet comprises the following steps:

[0007] Step 1, coating a layer of surface modification agent on the surface of the heat diffusion layer;

[0008] Step 2: laminating or coating a lower insulating layer on one side of the heat diffusion layer;

[0009] Step 3, design and arrange a set of A plate cutting dies, B plate cutting dies and C plate for hole punching;

[0010] Step 4: Hang the A-plate die on the die-cutting machine to punch out the product and punch out the positioning holes on the protective film at the same time;

[0011] Step 5: Place the punched product and the protective film with holes punched in the middle of the PET film, with the protective film facing down and the heat diffusion layer facing up;

[0012] Step 6: Apply the upper insulating layer on the heat diffusion layer and attach the PET film. Use the calendering process. The roller allows the rubber to flow over the product and form a coating layer. The rubber cannot cover the positioning holes of the protective film. Then, shape and solidify. The heating molding temperature is 80-100°C, and the baking time is not less than 30 minutes.

[0013] Step 7: Stick tape on the upper and lower templates of the die-cutting machine, put the B-plate cutting die and the C-plate sleeve holes together and place them on the lower template, and adjust the machine so that the B-plate cutting die is hung on the upper template and the C-plate is attached to the lower template;

[0014] Step eight, tear off the upper and lower PET films, the PET film is a single-sided silicone release PET film, stick the product on the C board, the hole position on the protective film is consistent with the hole position on the C board, and the diameter is also the same, punch out the product and discard it.

[0015] According to the above technical solution, the heat diffusion layer is a graphite sheet or a copper foil with a thickness of ≤0.5 mm.

[0016] According to the above technical solution, the lower insulating layer is an insulating tape or insulating rubber with a thickness of 0.2 to 1 mm; the insulating tape is a tape with a non-porous substrate; the insulating rubber is formed by curing an additive liquid silicone rubber or acrylic resin, and the viscosity of the rubber is between 30,000 and 100,000 cs.

[0017] According to the above technical solution, the upper insulating layer is an insulating rubber material, and the thickness above the heat diffusion layer is between 0.3 and 10 mm. The insulating rubber material is cured by additive liquid silicone rubber material, thermal conductive silicone rubber material or flame retardant silicone rubber material, and the viscosity of the rubber material is between 30,000 and 100,000 cs.

[0018] According to the above technical solution, the surface modification agent is one or more of a silane coupling agent and a titanate coupling agent.

[0019] According to the above technical solution, the circular knife used for punching the positioning holes of the A plate cutting die and the B plate cutting die should be in the same position as the positioning column of the B plate cutting die, and the hole diameter of the circular knife should be larger than the positioning column, with a difference of 0.5mm.

[0020] According to the above technical solution, the outer contour dimensions of the blade structure of the A-plate cutting die are 0.5-5mm smaller than those of the product, and the internal structure dimensions are 0.5-5mm larger than those of the product. The cutting die dimension design method is as follows: based on the product structure, the outer contour is reduced as a whole, and the hole type of the internal structure is expanded at the same position.

[0021] According to the above technical solution, the effective height of the positioning column of the B-plate cutting die = B-plate blade height + product thickness + 1 to 3 mm.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are: the new heat diffusion composite sheet and preparation method use a specific process to wrap an insulating layer around the heat diffusion layer 2, and a protective film is also provided on the outside, thereby improving the insulation performance of the heat diffusion sheet, allowing users to use it more safely and the product performance is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the A-plate cutting die of the method of the present invention;

[0026] Figure 3 It is a schematic diagram of the B plate cutting die structure of the method of the present invention;

[0027] Figure 4 Schematic diagram of the C-plate structure of the method of the present invention;

[0028] In the figure: 1. Upper insulating layer; 2. Heat diffusion layer; 3. Lower insulating layer; 4. Protective film; 5. A-board cutting die; 6. B-board cutting die; 7. C-board. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-4 The present invention provides a technical solution: a novel heat diffusion composite sheet, comprising an upper insulating layer 1, a heat diffusion layer 2, a lower insulating layer 3 and a protective film 4, wherein the lower surface of the heat diffusion layer 2 has a lower insulating layer 3, the heat diffusion layer 2 is a graphite sheet or a copper foil, and the thickness is ≤0.5mm, the upper surface and surrounding of the heat diffusion layer 2 have an upper insulating layer 1, and the bottoms of the upper insulating layer 1 and the lower insulating layer 3 are both arranged on the upper surface of the protective film 4, the lower insulating layer 3 is an insulating tape or an insulating adhesive, the insulating tape with a thickness of 0.2 to 1mm is an adhesive with a non-porous substrate; the insulating adhesive is an additive liquid silicone rubber adhesive or an acrylic resin cured, and the adhesive viscosity is between 30000 and 100000cs, the upper insulating layer 1 is an insulating adhesive, and the thickness above the heat diffusion layer 2 is 0 .3~10mm, the insulating rubber is cured by additive liquid silicone rubber or thermal conductive silicone rubber or flame retardant silicone rubber, and the viscosity of the rubber is between 30000~100000cs.

[0031] A method for preparing a novel heat diffusion composite sheet comprises the following steps:

[0032] Step 1: coating the surface of the heat diffusion layer 2 with a layer of surface modification agent, wherein the surface modification agent is one or more of a silane coupling agent and a titanate coupling agent;

[0033] Step 2: a lower insulating layer 3 is laminated or coated on one side of the heat diffusion layer 2;

[0034] Step 3, design and arrange a set of A plate cutting dies 5, B plate cutting dies 6 and C plate 7 for punching holes;

[0035] Step 4: Hang the A-plate die 5 on the die-cutting machine to punch out the product and punch out the positioning holes on the protective film 4 at the same time;

[0036] Step 5: Place the punched product together with the punched protective film 4 in the middle of the PET film, with the protective film 4 facing downward and the heat diffusion layer 2 facing upward;

[0037] Step 6: Coat the upper insulating layer 1 on the heat diffusion layer 2 and attach the PET film. Use the calendering process. Roll the rubber material over the product to form a coating layer. The rubber material cannot cover the positioning holes of the protective film 4. Then, shape and solidify. The heating molding temperature is 80-100°C, and the baking time is not less than 30 minutes.

[0038] Step 7, stick tape on the upper and lower templates of the die-cutting machine, put the B plate die 6 and the C plate 7 holes together and put them on the lower template to adjust the machine table, so that the B plate die 6 is hung on the upper template, and the C plate 7 is attached to the lower template. The A plate die 5 and the B plate die 6, the circular knife used for punching the positioning hole of the A plate die 5 and the positioning column position of the B plate die 6 should be consistent, and the aperture of the circular knife should be larger than the positioning column, with a difference of 0.5mm. The outer contour size of the blade structure of the A plate die 5 is 0.5-5mm smaller than that of the product, and the internal structure size is 0.5-5mm larger than that of the product. The die size design method: based on the product structure, the overall outer contour is reduced, and the hole type of the internal structure is expanded at the same position. The effective height of the positioning column of the B plate die 6 = B plate blade height + product thickness + 1-3mm;

[0039] Step eight, tear off the upper and lower PET films, the PET film is a single-sided silicone release PET film, stick the product on the C board 7, the hole position on the protective film 4 is consistent with the hole position of the C board 7, and the diameter is also the same, punch out the product and discard it.

[0040] Based on the above, the present invention uses a specific process to wrap an insulating layer around the heat diffusion layer 2, and a protective film is also provided on the outside, thereby improving the insulation performance of the heat diffusion sheet, allowing users to use it more safely and with more stable product performance.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a novel heat diffusion composite sheet, the heat diffusion composite sheet comprising an upper insulating layer (1), a heat diffusion layer (2), a lower insulating layer (3) and a protective film (4), characterized in that: The lower surface of the heat diffusion layer (2) is provided with a lower insulating layer (3), the upper surface and surrounding areas of the heat diffusion layer (2) are provided with an upper insulating layer (1), and the bottoms of the upper insulating layer (1) and the lower insulating layer (3) are both arranged on the upper surface of the protective film (4), and also includes a method for preparing a heat diffusion composite sheet, comprising the following steps: Step 1: coating the surface of the heat diffusion layer (2) with a layer of surface modification agent; Step 2: laminating or coating one side of the heat diffusion layer (2) with a lower insulating layer (3); Step 3, designing and arranging a set of A plate cutting dies (5), B plate cutting dies (6) and C plate (7) for punching holes; Step 4: Hang the A-plate die (5) on the die-cutting machine to punch out the product and punch out the positioning holes on the protective film (4); Step 5, placing the punched product together with the protective film (4) with holes punched in the middle of the PET film, with the protective film (4) facing downward and the heat diffusion layer (2) facing upward; Step 6: Coat the upper insulating layer (1) on the heat diffusion layer (2) and attach the PET film, using a calendering process. The roller allows the rubber to flow over the product and form a coating layer. The rubber cannot cover the positioning holes of the protective film (4). Then the product is molded and solidified. The heating molding temperature is 80-100°C, and the baking time is not less than 30 minutes. Step 7: Stick tape on the upper and lower templates of the die-cutting machine, put the B plate die (6) and C plate (7) together and put them on the lower plate. Adjust the machine on the template so that the B-plate cutting die (6) is hung on the upper template and the C-plate (7) is attached to the lower template; Step 8: Tear off the upper and lower PET films. The PET film is a single-sided silicone release PET film. Paste the product on the C board (7). The hole positions on the protective film (4) are consistent with the hole positions on the C plate (7), and the diameters are also the same, and the products are punched out and discharged as waste.

2. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The heat diffusion layer (2) is a graphite sheet or a copper foil, and has a thickness of ≤0.5 mm.

3. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The lower insulating layer (3) is an insulating tape or insulating rubber with a thickness of 0.2 to 1 mm; the insulating tape is a tape with a non-porous substrate; the insulating rubber is an additive liquid silicone rubber or an acrylic resin cured, and the viscosity of the rubber is between 30,000 and 100,000 cs.

4. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The upper insulating layer (1) is an insulating rubber material, and the thickness above the heat diffusion layer (2) is between 0.3 and 10 mm. The insulating rubber material is formed by curing an additive liquid silicone rubber material, a heat-conducting silicone rubber material, or a flame-retardant silicone rubber material, and the viscosity of the rubber material is between 30,000 and 100,000 cs.

5. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The surface modification agent is one or more of a silane coupling agent and a titanate coupling agent.

6. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The A-plate cutting die (5) and the B-plate cutting die (6) are characterized in that the circular knife used for punching the positioning hole of the A-plate cutting die (5) and the positioning column of the B-plate cutting die (6) are positioned in the same manner, and the hole diameter of the circular knife is larger than the positioning column, with a difference of 0.5 mm.

7. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The blade structure of the A-plate cutting die (5) is 0.5-5mm smaller than the product in terms of its outer contour dimensions, and its inner structure dimensions are 0.5-5mm larger than the product in terms of its inner structure dimensions. The cutting die dimensions are designed in such a way that the outer contour is reduced as a whole based on the product structure, and the hole type of the inner structure is enlarged at the same position.

8. The method for preparing a novel heat diffusion composite sheet according to claim 1, characterized in that: The effective height of the positioning column of the B-plate cutting die (6) = the height of the B-plate blade + the product thickness + 1 to 3 mm.

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