Preparation process of graphene heating product

Abstract

The invention discloses a preparation process of a graphene heating product, which comprises the following steps: step 1, putting an electrode into an injection molding cavity of an injection mold, and carrying out injection molding on the electrode and plastic in a molten state to obtain an integrated piece of the electrode and the plastic; or etching the base material, and electroplating the etched base material to obtain a conductive integrated part after etching is completed to obtain an ideal shape; 2, the obtained integrated part is subjected to graphene spraying, graphene slurry is used for spraying the surface of the integrated part, and drying is carried out after spraying; wherein the solid content of the graphene is 0.1%-10%; the thickness of a spraying film of the graphene slurry is 0.03-1 mm; the air pressure of the spray gun is 0.4-0.6 MPa; the fan-shaped angle of the spray gun is 35-45 degrees; the drying temperature is 50-70 DEG C, and the drying time is 5-6 minutes; and 3, connecting the wire harness with the electrode part in the integrated part in a fixed manner to obtain a finished graphene heating product. The graphene is sprayed on the integrated part, so that the integrated part has an electric heating function and is attractive, and procedures are saved.

Description

Technical Field

[0001] The invention relates to a preparation process of a graphene heating product, belonging to the technical field of automobile interior decoration and seat peripherals. Background Art

[0002] With the discovery of graphene, graphene materials have been applied to heating products and the demand is increasing day by day. Graphene heating products are based on graphene products and integrate graphene products into current seats and peripheral products such as automotive interiors, aviation, and rail transportation.

[0003] The process of existing graphene heating products is: graphene slurry coating - slitting film rolls - pre-baking film - copper foil electrode cutting - electrode and packaging cloth hot roller lamination - riveting to fix the wiring harness - hot melt glue and non-woven fabric bonding - full cutting of the shape; the above describes the formation of a graphene heating pad, and then the heating pad and skeleton substrate are sprayed with glue - dried - coated - laminated to complete the integration of graphene heating material and skeleton substrate.

[0004] Since the graphene product preparation process includes coating, laser cutting, silver paste printing / copper foil pasting, hot roller lamination and other processes; when the graphene products just mentioned are integrated into products such as interior decoration and seats, it is equivalent to adding graphene integration-related processes and operations to the original processes and equipment investment, which in turn increases the manufacturing cost and investment. In addition, the visual effect of graphene heating products made by the existing preparation process is poor. Summary of the invention

[0005] The present invention designs and develops a preparation process of a graphene heating product, in which graphene is sprayed on an integrated component so that the integrated component has the function of electrical heating, heats evenly, saves steps, and improves processing efficiency.

[0006] Another purpose of the present invention is to improve the performance and visual effect of the graphene heating product by adjusting the spraying parameters, the solid content of the graphene and the thickness of the sprayed film during the preparation process.

[0007] The technical solution provided by the present invention is:

[0008] A preparation process of a graphene heating product, comprising:

[0009] Step 1: preparing an integrated component;

[0010] The electrode is placed in the injection cavity of the injection mold and injection molded together with the molten plastic to obtain an integrated component of the electrode and the plastic; or

[0011] The substrate is etched to obtain a desired shape, the etching is completed, and the etched substrate is electroplated to obtain a conductive integrated component;

[0012] Step 2: spraying graphene on the obtained integrated component, including:

[0013] Spraying the surface of the integrated component with graphene slurry and drying it after spraying;

[0014] Wherein, the solid content of graphene is 0.1% to 10%;

[0015] The spray film thickness of graphene slurry is 0.03-1 mm;

[0016] The air pressure of the spray gun is 0.4~0.6MPa;

[0017] The fan angle of the spray gun is 35 to 45 degrees;

[0018] The drying temperature is 50-70°C and the drying time is 5-6 minutes;

[0019] Step 3: Connect the wiring harness to the electrode part in the integrated component in a fixed manner to obtain a finished graphene heating product.

[0020] Preferably, in step 1, the process of preparing the integrated component of the electrode and the plastic includes:

[0021] Cut the electrode into the ideal shape, hang the cut electrode on the hanging pin of the injection mold, start the injection molding equipment for injection molding, use 200-300℃ molten plastic under 50-100MPa pressure through a hole with a diameter of no more than 1mm 2 The material is injected into the mold cavity within 1 to 3 seconds for injection molding.

[0022] Preferably, a protective layer is further provided outside the electrode.

[0023] Preferably, the material used in the injection molding process is a polymer material.

[0024] Preferably, the material of the electrode is at least one of a metal material, an alloy material, and a composite material.

[0025] Preferably, the etching material is at least one of metal material, glass material, stone material and polymer material.

[0026] Preferably, the etching method is at least one of immersion etching, spray etching and bubbling etching.

[0027] Preferably, the etching solution used in the etching is an acidic etching solution or an alkaline etching solution, the acidic etching solution is used at a temperature of 40-60°C, and the alkaline etching solution is used at a temperature of 50-60°C.

[0028] Preferably, the graphene slurry is one of the following:

[0029] Graphene DMF dispersion slurry, graphene content is 5wt%, auxiliary agent content is 2wt%, solvent is water, viscosity is 5-15mPa·s, particle size D50 is 7.9μm, D90 is 20μm;

[0030] Graphene water-based slurry for coating ink, with a solid content of 8%, a solvent of water, and an additive content of 0.5%-3%;

[0031] The aqueous graphene slurry has a solid content of 0.1 to 10%, a solvent of water, and an additive of 0.5 to 3%.

[0032] The beneficial effects described in the present invention: The preparation method of the graphene heating product provided by the present invention is based on insert injection molding / etching + electroplating to form a skeleton substrate with electrodes, and the graphene slurry is sprayed onto the skeleton substrate by spraying to form a graphene heating layer, and the graphene is combined with the door panel or other automotive parts, which saves more than a dozen preparation steps, saves labor and equipment investment, and improves the production efficiency of the graphene heating product. This product heats evenly and has good visual effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the graphene heating product described in the present invention.

[0034] Figure 2(a) is a picture of a product with a heated product mark on the surface that was not prepared using this process.

[0035] FIG2( b ) is a picture of a product obtained using this preparation process with no heating marks on the surface. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0037] like Figure 1 -2, the present invention provides a preparation process of a graphene heating product, comprising: a skeleton layer 100, an electrode 200, a graphene layer 300, and a skin layer 400, wherein the graphene is sprayed on the integrated component to enable it to have an electric heating effect, save steps, and improve processing efficiency and visual effects, including:

[0038] Step 1: preparing an integrated component;

[0039] The electrode is placed in the injection cavity of the injection mold and injection molded together with the molten plastic to obtain an integrated component of the electrode and the plastic; or

[0040] After etching the substrate to obtain the desired shape, the etching is completed and electroplating is performed to obtain a conductive integrated component;

[0041] Step 2: spraying graphene on the obtained integrated component, including:

[0042] Spraying the surface of the integrated component with graphene slurry and drying it after spraying;

[0043] Wherein, the solid content of graphene is 0.1% to 10%;

[0044] The spray film thickness of graphene slurry is 0.03-1 mm;

[0045] The air pressure of the spray gun is 0.4~0.6MPa;

[0046] The fan angle of the spray gun is 35 to 45 degrees;

[0047] The drying temperature is 50-70°C and the drying time is 5-6 minutes;

[0048] Step 3: Connect the wiring harness to the electrodes in the integrated component in a fixed manner to obtain a finished graphene heating product.

[0049] The process of preparing the integrated substrate of electrode and plastic includes:

[0050] Cut the electrode into the ideal shape, hang the cut electrode on the hanging pin of the injection mold, start the injection molding equipment for injection molding, use 200-300℃ molten plastic under 50-100MPa pressure through a hole with a diameter of no more than 1mm 2 The gate is injected into the mold cavity within 1 to 3 seconds for injection molding.

[0051] The materials used are polymer materials.

[0052] The material of the electrode is at least one of a metal material, an alloy material, and a composite material.

[0053] The material to be etched is at least one of metal material, glass material, stone material and polymer material.

[0054] In the present invention, as a preferred embodiment, the material of the electrode is metallic copper.

[0055] Graphene slurry includes:

[0056] The graphene DMF dispersion slurry has a graphene content of 5wt%, an auxiliary agent content of 2wt%, water as a solvent, a viscosity of 5-15mPa·s, a particle size D50 of 7.9μm, and a D90 of 20μm.

[0057] The graphene aqueous slurry for coating ink has a solid content of 8%, a solvent of water, and an additive content of 0.5%-3%.

[0058] The aqueous graphene slurry has a solid content of 0.1 to 10%, a solvent of water, and an additive of 0.5 to 3%.

[0059] In the present invention, as a preferred embodiment, aqueous graphene slurry is selected.

[0060] During the etching process, the etching solution includes an acidic etching solution or an alkaline etching solution. The use temperature of the acidic etching solution is 40-60°C, and the use temperature of the alkaline etching solution is 50-60°C.

[0061] In another embodiment, a protective layer is further provided outside the electrode to protect the electrode.

[0062] Example 1

[0063] The electrode is integrated with the middle trim of the automobile door panel, and a heated middle trim is obtained by spraying graphite slurry, which specifically includes:

[0064] The electrode is cut into a spring style with a width of 10mm and a total length of 100mm. The cut electrode is hung on the hanging pin of the injection mold. The door panel injection molding equipment is started for injection molding. PC+ABS plastic in a molten state at 250℃ is used under a pressure of 100MPa through a hole with a diameter of no more than 1mm. 2 The gate is injected into the mold cavity within 1S for injection molding.

[0065] The obtained integrated component is subjected to graphene spraying, including:

[0066] Spraying the surface of the integrated component with graphene slurry and drying it after spraying;

[0067] Among them, the solid content of graphene is 1%;

[0068] The sprayed film thickness of graphene slurry is 0.06 mm;

[0069] The air pressure of the spray gun is 0.5MPa;

[0070] The fan angle of the spray gun is 40 degrees;

[0071] The drying temperature is 50°C and the drying time is 6 minutes;

[0072] The wiring harness is connected to the electrodes in the integrated component in a fixed manner to obtain a finished graphene center trim heating product.

[0073] Example 2

[0074] The electrode is integrated with the middle trim of the automobile door panel, and a heated middle trim is obtained by spraying graphite slurry, which specifically includes:

[0075] The electrode is cut into a spring style with a width of 10mm and a total length of 100mm. The cut electrode is hung on the hanging pin of the injection mold. The door panel injection molding equipment is started for injection molding. PC+ABS plastic in a molten state at 230℃ is used. Under a pressure of 80MPa, the diameter is not greater than 1mm. 2 The gate is injected into the mold cavity within 3S for injection molding.

[0076] The obtained integrated component is subjected to graphene spraying, including:

[0077] Use water-based graphene slurry to spray the surface of the integrated component, and then dry it after spraying;

[0078] Among them, the solid content of graphene is 0.1%;

[0079] The sprayed film thickness of graphene slurry is 0.06 mm;

[0080] The air pressure of the spray gun is 0.4MPa;

[0081] The fan angle of the spray gun is 35 degrees;

[0082] The drying temperature is 60°C and the drying time is 5 minutes;

[0083] The wiring harness is connected to the electrodes in the integrated component in a fixed manner to obtain a finished graphene center trim heating product.

[0084] Example 3

[0085] The electrode is integrated with the middle trim of the automobile door panel, and a heated middle trim is obtained by spraying graphite slurry, specifically including:

[0086] The electrode is cut into a spring style with a width of 10mm and a total length of 100mm. The cut electrode is hung on the hanging pin of the injection mold. The door panel injection molding equipment is started for injection molding. PC+ABS plastic in a molten state of 270℃ is used. Under a pressure of 50MPa, the diameter is not greater than 1mm. 2 The gate is injected into the mold cavity within 3S for injection molding.

[0087] The obtained integrated component is subjected to graphene spraying, including:

[0088] Use water-based graphene slurry to spray the surface of the integrated component, and then dry it after spraying;

[0089] Among them, the solid content of graphene is 10%;

[0090] The sprayed film thickness of graphene slurry is 0.06 mm;

[0091] The air pressure of the spray gun is 0.6MPa;

[0092] The fan angle of the spray gun is 45 degrees;

[0093] The drying temperature is 70°C and the drying time is 5 minutes;

[0094] The wiring harness is connected to the electrodes in the integrated component in a fixed manner to obtain a finished graphene center trim heating product.

[0095] Example 4

[0096] The center trim panel substrate is immersed and etched to obtain a spring pattern with a width of 10 mm and a total length of 100 mm. After the etching is completed, the etched substrate is electroplated to obtain a conductive electrode + substrate integration component; the substrate is plasma surface treated to increase the surface tension of the substrate.

[0097] Among them, the base material of the center trim panel is ABS.

[0098] The etching solution is an acidic etching solution at a temperature of 50°C.

[0099] The obtained integrated component is subjected to graphene spraying, including:

[0100] Use water-based graphene slurry to spray the surface of the integrated component, and then dry it after spraying;

[0101] Among them, the solid content of graphene is 1%;

[0102] The sprayed film thickness of graphene slurry is 0.06 mm;

[0103] The air pressure of the spray gun is: 0.5MPa;

[0104] The fan angle of the spray gun is 45 degrees;

[0105] The drying temperature is 60°C and the drying time is 6 minutes;

[0106] The wiring harness is connected to the electrodes in the integrated component in a fixed manner to obtain a finished graphene center trim heating product.

[0107] Comparative Example

[0108] Graphene slurry coating - film roll slitting - film pre-baking - film and copper foil electrode cutting - film, electrode and packaging cloth hot roller lamination - riveting to fix the wiring harness - hot melt adhesive and non-woven fabric bonding - full cutting of the shape; the above describes the formation of a graphene heating pad, and then the heating pad and skeleton substrate are sprayed with glue - dried - coated to complete the integration of graphene heating material and skeleton substrate.

[0109] The graphene heating products prepared in Examples 1 to 4 and the comparative example were tested, and the test contents included:

[0110] High temperature resistance test: 90±2℃, storage for 24h;

[0111] Cold resistance test: -40±2℃, storage for 24h;

[0112] High and low temperature and humidity alternating test:

[0113] a.40±1℃, 95±5%RH, 14h;

[0114] b.-40±2℃, 4h;

[0115] c.85±2℃, 6h;

[0116] ac is 1 cycle, totaling 20 cycles;

[0117] Hot air aging test: 80±2℃, storage for 700±2h;

[0118] Peel strength test, including: ①. After delivery ②. After hot air aging ③. After high and low temperature humidity and heat resistance ④. After low temperature resistance;

[0119] The epidermal yellowing test was powered on for 10 hours, powered off for 14 hours, and the cycle test was 30 days;

[0120] Plastic parts are deformed by powering on for 10 hours, powering off for 14 hours, and then cycled for 30 days;

[0121] Performance degradation: power on for 10 hours, power off for 14 hours, and cycle test for 30 days.

[0122] The test results are shown in Table 1:

[0123] Table 1

[0124]

[0125]

[0126] The peel force test also includes:

[0127] Comparative example: the peeling force between the epidermis layer and the graphene layer is ≥25.2N.

[0128] Example 1: The peeling force between the epidermis layer and the graphene layer is ≥27.5N.

[0129] Example 2: The peeling force between the epidermis layer and the graphene layer is ≥26.8N.

[0130] Example 3: The peeling force between the epidermis layer and the graphene layer is ≥27.3N.

[0131] Example 4: The peeling force between the epidermis layer and the graphene layer is ≥27.8N.

[0132] It can be seen from the comparative examples, Examples 1 to 4 and the above test results that the product prepared by the method for preparing a graphene heating product provided by the present invention can save more than a dozen preparation steps in the preparation process, which means that a large amount of manpower, material resources and time costs can be saved, and the production efficiency can be greatly improved. It can be seen from Table 1 that the performance of the product prepared by this method can reach the performance of existing products, and is even better than the product prepared in the comparative example in terms of peeling force.

[0133] At the same time, the door panel product prepared by the preparation process provided by the present invention has no marks on the whole due to the graphene coating, which improves the visual effect during use, as shown in Figure 2(b). However, the door panel integrated by the existing graphene layer + electrode layer method will have the problem of product surface imprint caused by the electrode shape on the product surface after processing, as shown in Figure 2(a).

[0134] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A preparation process of a graphene heating product, characterized in that: include: Step 1: preparing an integrated component; The electrode is placed in the injection cavity of the injection mold and injection molded together with the molten plastic to obtain an integrated component of the electrode and the plastic; or The substrate is etched to obtain a desired shape, the etching is completed, and the etched substrate is electroplated to obtain a conductive integrated component; Step 2: spraying graphene on the obtained integrated component, including: Spraying the surface of the integrated component with graphene slurry and drying it after spraying; Wherein, the solid content of graphene is 0.1% to 10%; The spray film thickness of graphene slurry is 0.03-1 mm; The air pressure of the spray gun is 0.4~0.6MPa; The fan angle of the spray gun is 35 to 45 degrees; The drying temperature is 50-70°C and the drying time is 5-6 minutes; Step 3: Connect the wiring harness to the electrode part in the integrated component in a fixed manner to obtain a finished graphene heating product.

2. The preparation process of the graphene heating product according to claim 1, characterized in that: In the step 1, the process of preparing the integrated component of the electrode and the plastic includes: Cut the electrode into the ideal shape, hang the cut electrode on the hanging pin of the injection mold, start the injection molding equipment for injection molding, use 200-300℃ molten plastic under 50-100MPa pressure through a hole with a diameter of no more than 1mm 2 The material is injected into the mold cavity within 1 to 3 seconds for injection molding.

3. The preparation process of the graphene heating product according to claim 2, characterized in that: A protective layer is also arranged outside the electrode.

4. The preparation process of the graphene heating product according to claim 3, characterized in that: In the injection molding process, the material used is a polymer material.

5. The preparation process of the graphene heating product according to claim 4, characterized in that: The material of the electrode is at least one of a metal material, an alloy material, and a composite material.

6. The preparation process of the graphene heating product according to claim 5, characterized in that: The etching material is at least one of metal material, glass material, stone material and polymer material.

7. The preparation process of the graphene heating product according to claim 6, characterized in that: The etching method is at least one of immersion etching, spray etching and bubbling etching.

8. The preparation process of the graphene heating product according to claim 7, characterized in that: The etching liquid used in the etching is an acidic etching liquid or an alkaline etching liquid. The use temperature of the acidic etching liquid is 40-60°C, and the use temperature of the alkaline etching liquid is 50-60°C.

9. The preparation process of the graphene heating product according to claim 8, characterized in that: The graphene slurry is one of the following: Graphene DMF dispersion slurry, graphene content is 5wt%, auxiliary agent content is 2wt%, solvent is water, viscosity is 5-15mPa·s, particle size D50 is 7.9μm, D90 is 20μm; Graphene water-based slurry for coating ink, with a solid content of 8%, a solvent of water, and an additive content of 0.5%-3%; The aqueous graphene slurry has a solid content of 0.1 to 10%, a solvent of water, and an additive of 0.5 to 3%.

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