Graphite copper-based gel and preparation method thereof

Abstract

The invention discloses a graphite copper-based gel and a preparation method thereof, and the graphite copper-based gel comprises the following raw materials by weight: 5-10 parts of an inorganic filler; 3 to 6 parts of nanometer powder; 20 to 40 parts of a cross-linking agent; 0.1-3 parts of a dispersant; 0.1 to 3 parts of a leveling agent; 0.3 to 5 parts of foaming powder; 5 to 15 parts of a catalyst; 3 to 10 parts of carbon black; 0.1 to 3 parts of a defoaming agent; and the balance of glue. According to the invention, the buffer and heat dissipation effects are improved, and the anti-stamping effect and the heat dissipation effect of the product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives for electronic products, and specifically to a graphite copper-based gel and a preparation method thereof. Background Art

[0002] With the advancement of the wave of domestic substitution and the demand for thinner and lighter electronic consumer products, the original foam for the under-screen structure was mostly imported foam with a relatively large thickness. Now, there is a trend to reduce the thickness and achieve domestic substitution.

[0003] Currently, the emerging material on the market is silicone gel. Although this material has good buffering performance, its heat dissipation effect is average, and it is prone to die marks. For this reason, we propose a graphite copper-based gel and a preparation method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a graphite copper-based gel and a preparation method thereof to solve the problems of average heat dissipation effect and easy occurrence of die marks in the existing technology.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A graphite copper-based gel, comprising the following raw materials in parts by weight:

[0006] Inorganic filler, 5 - 10 parts;

[0007] Nanopowder, 3 - 6 parts;

[0008] Crosslinking agent, 20 - 40 parts;

[0009] Dispersant, 0.1 - 3 parts;

[0010] Leveling agent, 0.1 - 3 parts;

[0011] Foaming powder, 0.3 - 5 parts;

[0012] Catalyst, 5 - 15 parts;

[0013] Carbon black, 3 - 10 parts;

[0014] Defoaming agent, 0.1 - 3 parts;

[0015] Glue, the balance.

[0016] Preferably, it further comprises an antistatic agent, 0.1 - 7 parts.

[0017] Preferably, the inorganic filler is at least one of MgO, CaO, Al2O3, ZrO2, ZnO, MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, β-LiAlSiO4, and 2MgO·2Al2O3·5SiO2; the nanoflour is at least one of MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, CuO·Cr2O3, and 2MgO·2Al2O3·5SiO2.

[0018] Preferably, the glue is a modified acrylic or silicone pressure-sensitive adhesive.

[0019] Preferably, the crosslinking agent is one of isocyanate, epoxy, and hydrogen-containing silicone oil; the catalyst is platinum water; the leveling agent is one or a combination of polydimethylsiloxane, alkyl-modified silicone, acrylate, and organically modified polysiloxane acrylate; the defoaming agent is one or a combination of polydimethylsiloxane copolymer, ethylene oxide or propylene oxide copolymer, and phosphate copolymer.

[0020] Preferably, the antistatic agent is carbon nanotubes or carbon black.

[0021] Preferably, it further includes a copper foil layer. One side of the copper foil layer is provided with a PET double-sided adhesive layer. The side of the PET double-sided adhesive layer away from the copper foil layer is provided with a graphite layer. The side of the graphite layer away from the PET double-sided adhesive layer is provided with a gel layer. The side of the gel layer away from the graphite layer is provided with a release layer.

[0022] A preparation method of a graphite copper-based gel includes the following steps:

[0023] S1. Graphite-copper lamination: After the surface of the graphite is treated with plasma, it is laminated with the PET double-sided adhesive, and a protective film is attached to the graphite surface again;

[0024] S2. Die cutting: Die cut the laminated finished product;

[0025] S3. Waste discharging: Discharge the areas other than the die-cut areas;

[0026] S4. Lamination: Using the protective film as a carrier tape, fix the die-cut graphite on the copper foil through the double-sided adhesive;

[0027] S5. Glue raw material preparation: Prepare the raw materials according to the following parts by weight: acrylic or silicone glue, 5-10 parts of inorganic filler, 3-6 parts of nanoflour, 20-40 parts of crosslinking agent, 0.1-3 parts of dispersant, 0.1-3 parts of leveling agent, 0.3-5 parts of foaming powder, 5-15 parts of catalyst, 3-10 parts of carbon black, 0.1-3 parts of defoaming agent, 0.1-7 parts of antistatic agent;

[0028] S6. Preliminary mixing of raw materials: a. Add nano powder, carbon black, foaming powder, leveling agent, and dispersant to the glue in sequence and mix them. Use a high-speed disperser for dispersion, control the rotation speed at 800 - 1500, and control the stirring temperature < 50°C; b. Add the curing agent and catalyst to the mixed glue in proportion in sequence and continue stirring.

[0029] S7. Filtration: Filter the mixed liquid through a 300-mesh filter screen to remove agglomerated gel points and foreign substances in the colloid. Take the filtrate to obtain the gel raw material.

[0030] Preferably, in S1, the PET double-sided tape uses a 10μ PET double-sided tape.

[0031] Preferably, in S2, the die-cut size is approximately 160mm * 60mm, and a fingerprint hole of about 2mm * 2mm is opened at the middle wide part of the one-third position of the long side. Only the double-sided tape and graphite are die-cut together in the large rectangular area without damaging the surface protective film, and both the upper and lower positions of the middle fingerprint hole are die-cut.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. Compared with the foam, the thickness is reduced, and the buffering and heat dissipation effects are improved;

[0034] 2. Compared with the silicone gel, the anti-stamping effect and heat dissipation effect of the product are improved. Description of the Drawings

[0035] The 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 to the present invention. In the drawings:

[0036] Figure 1 is the structural schematic diagram of the present invention;

[0037] Figure 2 is the flow chart of the present invention.

[0038] In the figure: 1. Copper foil layer; 2. PET double-sided tape layer; 3. Graphite layer; 4. Gel layer; 5. Release layer. Detailed Embodiments

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0040] Please refer to Figure 1-2 , in an embodiment of the present invention, a graphite copper-based gel includes the following raw materials in parts by weight:

[0041] Inorganic filler, 5 - 10 parts;

[0042] Nanopowder, 3 - 6 parts;

[0043] Crosslinking agent, 20 - 40 parts;

[0044] Dispersant, 0.1 - 3 parts;

[0045] Leveling agent, 0.1 - 3 parts;

[0046] Foaming powder, 0.3 - 5 parts;

[0047] Catalyst, 5 - 15 parts;

[0048] Carbon black, 3 - 10 parts;

[0049] Defoaming agent, 0.1 - 3 parts;

[0050] Glue, the balance.

[0051] It further includes an antistatic agent, 0.1 - 7 parts. The antistatic agent is carbon nanotubes or carbon black. Because it has excellent conductivity itself, when it is dispersed in the colloid and forms a path through lamination, it has excellent antistatic effect, and the antistatic level can reach from the 4th power of 10 to the 11th power of 10.

[0052] The inorganic filler is at least one of MgO, CaO, Al2O3, ZrO2, ZnO, MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, β-LiAlSiO4, and 2MgO·2Al2O3·5SiO2; the nanopowder is at least one of MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, CuO·Cr2O3, and 2MgO·2Al2O3·5SiO2; the glue is modified acrylic or silicone pressure-sensitive adhesive, which has excellent buffering performance due to its special molecular chain structure; the crosslinking agent is one of isocyanate, epoxy, and hydrogen-containing silicone oil, which reacts with the hydroxyl group on acrylic acid or the Si-O-Si bond of silicone to form a network structure and has a certain impact resistance; the crosslinking agent is one of isocyanate, epoxy, and hydrogen-containing silicone oil; the catalyst is platinum water; the leveling agent is one or a combination of polydimethylsiloxane, alkyl-modified organosiloxane, acrylate, and organically modified polysiloxane acrylate; the defoaming agent is one or a combination of polydimethylsiloxane copolymer, ethylene oxide or propylene oxide copolymer, and phosphate copolymer.

[0053] It further includes a copper foil layer 1. A PET double-sided adhesive layer 2 is provided on one side of the copper foil layer 1. A graphite layer 3 is provided on the side of the PET double-sided adhesive layer 2 away from the copper foil layer 1. A gel layer 4 is provided on the side of the graphite layer 3 away from the PET double-sided adhesive layer 2. A release layer 5 is provided on the side of the gel layer 4 away from the graphite layer 3.

[0054] A preparation method of a graphite copper-based gel includes the following steps:

[0055] S1. Graphite-copper lamination: After the graphite surface is treated with plasma, it is laminated with the PET double-sided adhesive, and a protective film is pasted on the graphite surface again; the PET double-sided adhesive uses 10μ PET double-sided adhesive.

[0056] S2. Die cutting: The laminated finished product is die cut; the die cutting size is approximately 160mm * 60mm, and a fingerprint hole of about 2mm * 2mm is opened at the middle wide area at one-third of the long side. Note that the depth should be controlled during die cutting. Only the double-sided adhesive and graphite are die cut together in the large rectangular area without damaging the surface protective film, and both the upper and lower positions of the middle fingerprint hole are die cut.

[0057] S3. Scrap discharging: The area outside the die-cut rectangle of 160mm * 60mm is discharged.

[0058] S4. Lamination: Through the protective film as a carrier tape, the die-cut graphite is fixed on the copper foil through the double-sided adhesive.

[0059] S5. Preparation of glue raw materials: Prepare raw materials according to the following parts by weight: acrylic or silicone glue, 5 - 10 parts of inorganic filler, 3 - 6 parts of nano powder, 20 - 40 parts of crosslinking agent, 0.1 - 3 parts of dispersant, 0.1 - 3 parts of leveling agent, 0.3 - 5 parts of foaming powder, 5 - 15 parts of catalyst, 3 - 10 parts of carbon black, 0.1 - 3 parts of defoaming agent, 0.1 - 7 parts of antistatic agent;

[0060] S6. Preliminary mixing of raw materials: a. Add nano powder, carbon black, foaming powder, leveling agent, and dispersant into the glue in sequence and mix them. Use a high - speed disperser for dispersion, control the rotation speed at 800 - 1500, and control the stirring temperature < 50°C; b. Add the curing agent and catalyst into the mixed glue in proportion in sequence and continue stirring;

[0061] S7. Filtration: Filter the mixed liquid through a 300 - mesh filter screen to remove agglomerated gel points and foreign substances in the colloid. Take the filtrate to obtain the gel raw material.

[0062] Comparison data of graphite copper - based gel, foam, and silicone gel

[0063]

[0064] Comparison results of implementation cases:

[0065]

[0066] Finally, it should be noted that the above - mentioned are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A graphite copper-based gel, characterized in that, Comprising the following raw materials in parts by weight: Inorganic filler, 5 - 10 parts; Nanopowder, 3 - 6 parts; Crosslinking agent, 20 - 40 parts; Dispersant, 0.1 - 3 parts; Leveling agent, 0.1 - 3 parts; Foaming powder, 0.3 - 5 parts; Catalyst, 5 - 15 parts; Carbon black, 3 - 10 parts; Defoaming agent, 0.1 - 3 parts; Glue, the balance.

2. The graphite copper-based gel according to claim 1, wherein Also including an antistatic agent, 0.1 - 7 parts.

3. A graphite copper-based gel according to claim 1, characterized in that, The inorganic filler is at least one of MgO, CaO, Al2O3, ZrO2, ZnO, MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, β-LiAlSiO4 and 2MgO·2Al2O3·5SiO2; the nanopowder is at least one of MnO2, AlSiO5, Zr2WO3, H2O8P2Zr, CuO·Cr2O3 and 2MgO·2Al2O3·5SiO2.

4. A graphite copper-based gel according to claim 1, characterized in that, The glue is a modified acrylic or silicone pressure-sensitive adhesive.

5. A graphite copper-based gel according to claim 1, characterized in that, The crosslinking agent is one of isocyanate, epoxy, and hydrogen-containing silicone oil; the catalyst is platinum water; the leveling agent is one or a combination of polydimethylsiloxane, alkyl-modified silicone oxide, acrylate, and organically modified polysiloxane acrylate; the defoaming agent is one or more of polydimethylsiloxane copolymer, ethylene oxide or propylene oxide copolymer, and phosphate ester copolymer.

6. The graphite copper-based gel according to claim 2, wherein, The antistatic agent is carbon nanotubes or carbon black.

7. A graphite copper-based gel according to any one of claims 1-6, characterized in that Also including a copper foil layer (1), on one side of the copper foil layer (1) there is a PET double-sided adhesive layer (2), on the side of the PET double-sided adhesive layer (2) away from the copper foil layer (1) there is a graphite layer (3), on the side of the graphite layer (3) away from the PET double-sided adhesive layer (2) there is a gel layer (4), and on the side of the gel layer (4) away from the graphite layer (3) there is a release layer (5).

8. The preparation method of a graphite copper-based gel according to claim 7, characterized in that, Including the following steps: S1. Graphite-copper lamination: After the graphite surface is treated with plasma, it is laminated with the PET double-sided adhesive, and then a protective film is attached to the graphite surface; S2. Die cutting: The laminated finished product is die cut; S3. Scrap discharging: The areas other than the die cut are discharged as waste; S4. Lamination: Using the protective film as a carrier tape, the die-cut graphite is fixed on the copper foil through the double-sided adhesive; S5. Glue raw material preparation: Prepare raw materials according to the following parts by weight: acrylic or silicone glue, inorganic filler 5 - 10 parts, nanopowder 3 - 6 parts, crosslinking agent 20 - 40 parts, dispersant 0.1 - 3 parts, leveling agent 0.1 - 3 parts, foaming powder 0.3 - 5 parts, catalyst 5 - 15 parts, carbon black 3 - 10 parts, defoaming agent 0.1 - 3 parts, antistatic agent 0.1 - 7 parts; S6. Preliminary mixing of raw materials: a. The nanopowder, carbon black, foaming powder, leveling agent, and dispersant are sequentially added to the glue and mixed, and dispersed using a high-speed disperser, controlling the rotation speed at 800 - 1500, and controlling the stirring temperature < 50°C; b. The curing agent and catalyst are sequentially added to the mixed glue in proportion and continue to stir; S7. Filtration: The mixed liquid is filtered through a 300-mesh filter screen to remove agglomerated gel points and foreign substances in the colloid, and the filtrate is taken to obtain the gel raw material.

9. The preparation method of a graphite copper-based gel according to claim 8, wherein In the above S1, 10μ PET double-sided tape is used for the PET double-sided tape.

10. A graphite copper-based gel according to claim 8 and a preparation method thereof, characterized in that, In the above S2, the die-cut size is approximately 160mm * 60mm, and a fingerprint hole of approximately 2mm * 2mm is opened at the middle width position of one-third of the long side. Only the double-sided tape and the graphite are die-cut together in the large rectangular area without damaging the surface protective film. Die-cutting is performed both above and below the fingerprint hole position in the middle.

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