Modified graphene heating film material and preparation method thereof

Abstract

The invention discloses a modified graphene heating film material and a preparation method thereof, a solvent dissolves modified resin into a liquid state through the solubility of the solvent, and the modified resin can effectively increase the dispersivity of other materials, so that the other materials are effectively and uniformly distributed after being mixed. The graphene powder is a main conductive component and has a heating effect after being electrified, and the carbon black is an auxiliary conductive material. The coupling agent can improve the crosslinking property of the material, and the modified resin is combined, so that the overall bonding strength and flexibility of the material can be improved. And the curing agent can quickly harden and solidify the slurry when the material is dried. And the defoaming agent can eliminate microbubbles generated in the slurry due to stirring and slurry preparation, so that the overall uniformity of the slurry is improved. And the solvent is ethanol which has good solubility and volatility and can be quickly volatilized when the slurry enters a drying stage, so that the sheet resistance uniformity of the surface of the heating film is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene heating films, and more specifically, to a modified graphene heating film material and a preparation method thereof. Background Art

[0002] With the improvement of modern life and the promotion of energy conservation and environmental protection, the demand for electric heating film heating in daily life is gradually increasing. However, due to the limitations of traditional conductive materials themselves and poor heating uniformity, effective heating cannot be achieved in some scenarios such as aerospace and thermal management of power batteries for new energy vehicles. Therefore, the use of traditional conductive materials has great limitations. With this growing demand, the development of graphene electric heating film has become more urgent.

[0003] Graphene is a material with excellent thermal, optical, electrical and mechanical properties, and has good application prospects in many fields such as materials science, micro-nano processing, and energy. Graphene is applied to the field of electric heating to make graphene electric heating films, which have extremely high electric-to-heat conversion rates. At the same time, because the graphene material itself has extremely low resistivity, it can generate heat at a voltage of 5-36V after being mixed with other modified materials, realizing the need for heating under special conditions and solving the market pain points caused by scene adaptation problems. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In response to the problems existing in the prior art, the present invention provides a modified graphene heating film material and a preparation method thereof, so as to solve the problems of high cost of manual data annotation and high operation and maintenance cost of multiple model services in the process of medical record information extraction, and at the same time solve the problems of inaccurate medical record extraction and insufficient semantic understanding.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a modified graphene heating film material, comprising the following components by weight percentage: 5-15% graphene powder; 0.1-1% defoaming agent; 0.1-1% coupling agent; 1-2% curing agent; 5-15% carbon black; 20-40% modified resin; 30-60% solvent;

[0008] Graphene powder plays a conductive role. The small-sized highly conductive / thermal graphene powder produced by Deyang Encarbon Technology Co., Ltd. has an average number of layers of 5-6, a flake size of D50 < 1.0 μm, and a specific surface area of ​​50-65 m2 / g.

[0009] Defoaming agent, which can reduce the bubble content in the slurry after addition, polyether modified silicone oil CJ-1321 produced by Zhejiang Chuangji Silicone Materials Co., Ltd.;

[0010] Coupling agent, after adding, can increase the adhesion of the slurry and prevent cracking after drying. The titanate coupling agent TC-27 produced by Nanjing Tengchuan Technology Co., Ltd.

[0011] Curing agent, which will cure at high temperature, imidazole produced by Shanghai Nolaiju Chemical Co., Ltd.;

[0012] Carbon black, auxiliary conductivity, produced by Jinan Delan Chemical Co., Ltd.;

[0013] Modified resin, improves the flexibility and adhesion of materials, and increases the dispersibility of other materials, solid acrylic resin B-811 produced by Shanghai Kaiyin Chemical Co., Ltd.;

[0014] The solvent, ethanol, serves to dissolve other materials.

[0015] The present invention is further configured to include the following components in weight percentage: 10% graphene powder; 0.5% defoamer; 0.5% coupling agent; 1.5% curing agent; 10% carbon black; 30% modified resin; and 47.5% solvent.

[0016] The present invention also includes a method for preparing a modified graphene heating film material, comprising the following steps: Step 1: taking a modified resin in proportion and adding it to a container containing a solvent, heating and stirring to dissolve, the heating temperature is between 35-45 degrees, and stirring is continued for 1 minute after the resin is completely dissolved;

[0017] Step 2: Add graphene powder in proportion, stop heating, and continue stirring for 20 minutes;

[0018] Step 3: Add carbon black, stir for 20 minutes, and observe the color uniformity of the slurry;

[0019] Step 4: Add defoamer, coupling agent and curing agent, stir for 60 minutes, keep the ambient temperature between 30-40 degrees, and let it stand for 120 minutes after stirring.

[0020] Step 5: Take the slurry sample for screen printing coating, select glass as the substrate, test the square resistance after coating, and the square resistance value should be controlled within 14-16.

[0021] Step 6: Send the slurry to the discharge port of the coating machine, adjust the distance between the coating machine guide roller and the substrate to 5μm, and carry out the coating and plating process.

[0022] Step 7: Send the coated slurry to the drying device, the drying parameters are: 1) 90℃, 12 minutes; 2) 100℃, 10 minutes; 3) 110℃, 5 minutes; 4) 120℃, 3 minutes. After leaving the dryer, let it stand at room temperature (25-35℃) for 20 minutes.

[0023] Step 8: Attach copper tape electrodes with conductive adhesive backing to both ends, cover the slurry surface with PET material with EVA adhesive, and encapsulate it through a hot roller mill.

[0024] Step 9: Use a terminal machine to connect the terminals at the electrodes on both sides. Test the heating film resistance to be between 4.5-5 ohms, indicating that the heating film preparation meets the safety voltage requirements and the heating film preparation is completed.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides a modified graphene heating film material and a preparation method thereof, which has the following beneficial effects:

[0027] 1. The existing graphene heating film preparation process has the problem of insufficient flexibility of the film surface. After multiple bending, micro cracks will be generated on the surface, causing circuit breakage, sparking and other phenomena during use. The graphene heating film prepared by the present invention uses modified resin, which greatly increases the flexibility of the heating film and improves its service life;

[0028] 2. The existing graphene heating film has a low graphene content and too many graphene layers, which results in the heating film having too large resistance. It needs to be connected to a 110-220V voltage to achieve heating during use, which poses a safety hazard. The graphene heating film prepared by the present invention has a higher graphene content and lower resistivity, so that the heating film can generate heat at a voltage of 5-30V, thereby improving safety.

[0029] 3. The existing graphene heating film cannot achieve uniform mixing of the slurry during the preparation of the slurry, resulting in a large amount of solid raw materials adhering to the agitator and the inner wall of the container, making the surface resistance difference of the prepared heating film too large, resulting in uneven surface temperature during heating, with a maximum temperature difference of up to 5°C. The graphene heating film prepared by the present invention uses modified resin and defoaming agent, which greatly improves the dispersibility of the solid raw materials, thereby reducing the difference in surface resistance of the heating film, so that the surface temperature difference of the heating film does not exceed 1°C during heating;

[0030] 4. The equipment required for the overall process is only agitator, coater, dryer, packaging machine and terminal machine, and the entire production process can be controlled within 10 hours, with low production and processing costs and short production cycle;

[0031] 5. There is no liquid discharge in the whole production process. The ethanol gas emitted during drying will be automatically converted into carbon dioxide and water vapor in the dryer, and the emission is extremely low, which will not cause air pollution. DETAILED DESCRIPTION

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0033] Embodiment 1:

[0034] A modified graphene heating film material comprises the following components in weight percentage: 10% graphene powder; 0.5% defoaming agent; 0.5% coupling agent; 1.5% curing agent; 10% carbon black; 30% modified resin; and 47.5% solvent.

[0035] A method for preparing a modified graphene heating film material comprises the following steps: Step 1: taking 30% of the modified resin in proportion and adding it into a container containing 47.5% of a solvent, heating and stirring to dissolve, the heating temperature being between 35°C, and continuing to stir for 1 minute after the resin is completely dissolved;

[0036] Step 2: Add 10% of graphene powder in proportion, stop heating, and continue stirring for 20 minutes;

[0037] Step 3: Add 10% carbon black, stir for 20 minutes, and observe the color uniformity of the slurry;

[0038] Step 4: Add 0.5% defoamer, 0.5% coupling agent, and 1.5% curing agent, stir for 60 minutes, keep the ambient temperature at 30 degrees, and let it stand for 120 minutes after stirring.

[0039] Step 5: Take the slurry sample for screen printing coating, select glass as the substrate, and test the square resistance after coating. The square resistance value should be controlled within 14.

[0040] Step 6: Send the slurry to the discharge port of the coating machine, adjust the distance between the coating machine guide roller and the substrate to 5μm, and carry out the coating and plating process.

[0041] Step 7: Send the coated slurry to the drying device, the drying parameters are: 1) 90℃, 12 minutes; 2) 100℃, 10 minutes; 3) 110℃, 5 minutes; 4) 120℃, 3 minutes. After leaving the dryer, let it stand at room temperature (25-35℃) for 20 minutes.

[0042] Step 8: Attach copper tape electrodes with conductive adhesive backing to both ends, cover the slurry surface with PET material with EVA adhesive, and encapsulate it through a hot roller mill.

[0043] Step 9: Use a terminal machine to connect the terminals at the electrodes on both sides. Test the heating film resistance to be between 4.5 ohms, indicating that the heating film preparation meets the safety voltage requirements and the heating film preparation is completed.

[0044] Embodiment 2:

[0045] A modified graphene heating film material comprises the following components in weight percentage: 11% of graphene powder; 0.6% of defoaming agent; 0.6% of coupling agent; 1.8% of curing agent; 12% of carbon black; 33% of modified resin; and 49% of solvent.

[0046] A method for preparing a modified graphene heating film material comprises the following steps: Step 1: taking 33% of the modified resin in proportion and adding it into a container containing 49% of a solvent, heating and stirring to dissolve, the heating temperature being between 45°C, and continuing to stir for 1 minute after the resin is completely dissolved;

[0047] Step 2: Add 11% graphene powder in proportion, stop heating, and continue stirring for 20 minutes;

[0048] Step 3: Add 12% carbon black, stir for 20 minutes, and observe the color uniformity of the slurry;

[0049] Step 4: Add 0.6% defoamer, 0.6% coupling agent, and 1.8% curing agent, stir for 60 minutes, keep the ambient temperature at 40 degrees, and let it stand for 120 minutes after stirring.

[0050] Step 5: Take the slurry sample for screen printing coating, select glass as the substrate, and test the square resistance after coating. The square resistance value should be controlled within 16.

[0051] Step 6: Send the slurry to the discharge port of the coating machine, adjust the distance between the coating machine guide roller and the substrate to 5μm, and carry out the coating and plating process.

[0052] Step 7: Send the coated slurry to the drying device, the drying parameters are: 1) 90℃, 12 minutes; 2) 100℃, 10 minutes; 3) 110℃, 5 minutes; 4) 120℃, 3 minutes. After leaving the dryer, let it stand at room temperature (25-35℃) for 20 minutes.

[0053] Step 8: Attach copper tape electrodes with conductive adhesive backing to both ends, cover the slurry surface with PET material with EVA adhesive, and encapsulate it through a hot roller mill.

[0054] Step 9: Use a terminal machine to connect the terminals at the electrodes on both sides. Test the heating film resistance to be between 4.5 ohms, indicating that the heating film preparation meets the safety voltage requirements and the heating film preparation is completed.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A modified graphene heating film material, comprising the following components by weight percentage: 5-15% graphene powder; 0.1-1% defoaming agent; 0.1-1% coupling agent; 1-2% curing agent; 5-15% carbon black; 20-40% modified resin; and 30-60% solvent.

2. A modified graphene heating film material and a preparation method thereof according to claim 1, characterized in that: The composition includes the following components in weight percentage: 10% graphene powder; 0.5% defoamer; 0.5% coupling agent; 1.5% curing agent; 10% carbon black; 30% modified resin; and 47.5% solvent.

3. The present invention also includes a method for preparing a modified graphene heating film material, comprising the following steps: Step 1: Take the modified resin in proportion and add it to a container containing solvent, heat and stir to dissolve. The heating temperature is between 35-45 degrees. Continue stirring for 1 minute after the resin is completely dissolved. Step 2: Add graphene powder in proportion, stop heating, and continue stirring for 20 minutes; Step 3: Add carbon black, stir for 20 minutes, and observe the color uniformity of the slurry; Step 4: Add defoamer, coupling agent and curing agent, stir for 60 minutes, keep the ambient temperature between 30-40 degrees, and let it stand for 120 minutes after stirring. Step 5: Take the slurry sample for screen printing coating, select glass as the substrate, test the square resistance after coating, and the square resistance value should be controlled within 14-16. Step 6: Send the slurry to the discharge port of the coating machine, adjust the distance between the coating machine guide roller and the substrate to 5μm, and carry out the coating and plating process. Step 7: Send the coated slurry to the drying device, the drying parameters are: 1) 90℃, 12 minutes; 2) 100℃, 10 minutes; 3) 110℃, 5 minutes; 4) 120℃, 3 minutes. After leaving the dryer, let it stand at room temperature (25-35℃) for 20 minutes. Step 8: Attach copper tape electrodes with conductive adhesive backing to both ends, cover the slurry surface with PET material with EVA adhesive, and encapsulate it through a hot roller mill. Step 9: Use a terminal machine to connect the terminals at the electrodes on both sides. Test the heating film resistance to be between 4.5-5 ohms, indicating that the heating film preparation meets the safety voltage requirements and the heating film preparation is completed.