Preparation method of graphene mica tape

Abstract

The invention discloses a preparation method of a graphene mica tape. The preparation method comprises the following steps of raw material preparation, graphene dispersion treatment, a gluing procedure, composite forming, drying and curing treatment, slitting, rolling and quality inspection, detection of indexes such as appearance, thickness, temperature resistance and insulating strength of a finished product, and packaging and warehousing after the finished product is qualified. The mica-graphene composite material has the advantage that mica and graphene are combined to achieve high performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of preparation of graphene mica tape, and particularly relates to a preparation method of graphene mica tape. BACKGROUND

[0002] Graphene is a new type of two-dimensional nanomaterial, which has extremely high electron mobility and a resistivity of about 10-6Ω·cm. It is also the thinnest, hardest and most heat-conducting nanomaterial.

[0003] However, directly coating graphene on the surface of mica does not firmly combine, and the conductivity of mica is not obviously improved. Therefore, there is a need to develop a graphene material modified mica which has a surface capable of firmly combining graphene material and has obviously improved conductivity. SUMMARY

[0004] The present application aims to provide a preparation method of graphene mica tape to solve the problems in the background art, which has the advantages of combining mica and graphene to achieve high performance.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a preparation method of graphene mica tape, comprising the following steps:

[0006] Step 1: raw material preparation, mica paper,

[0007] Graphene material, the graphene material is selected from a powder with a purity of greater than 97wt% and a flake diameter of 0.8μm-25μm;

[0008] Adhesive, selected from epoxy resin or silicone resin;

[0009] Step 2: graphene dispersion treatment, the graphene material is added to a solvent, and is dispersed by mechanical stirring and ultrasonic dispersion with a power setting of 200-500W and a time setting of 30-60 minutes to break the graphene agglomeration and form a uniform and stable graphene dispersion liquid;

[0010] Step 3: gluing process, the composite adhesive containing graphene is uniformly coated on the surface of the reinforcing material, and the reinforcing material is selected from glass cloth;

[0011] Step 4: composite molding, the mica paper is combined with the reinforcing material coated with adhesive, and the two are tightly combined by rolling or other methods to form a preliminary composite layer structure;

[0012] Step 5: drying and curing treatment, the composite material is sent into a drying machine and dried at a temperature of 80-150℃;

[0013] Step 6: slitting and winding, the dried mica tape is cut into the required width by a slitting machine, and then wound into a roll by a winding machine to complete the production of finished products.

[0014] Step 7: quality inspection, appearance, thickness, temperature resistance, insulation strength and other indicators detection, qualified can be packaged into warehouse.

[0015] Preferably, in step 2, a non-ionic surfactant is added, and the non-ionic surfactant is selected from polyoxyethylene octylphenol ether.

[0016] Preferably, in step 4, a multi-layer composite

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1. Physical properties, good flexibility: the addition of graphene makes the mica tape more flexible and bendable while maintaining the high temperature resistance and other properties of mica, which can tightly wrap around cables, coils and other objects, and is suitable for wrapping objects of various complex shapes. Light and thin: graphene itself has a carbon atom layer thickness, and after combining with mica, the overall thickness is thin and the weight is light, which is convenient for construction and use.

[0019] 2. Mechanical properties, high strength: graphene has extremely high strength, which can significantly improve the tensile strength of the mica tape, making it less likely to break when stretched by external force, and improving the tear resistance and wear resistance of the mica tape. Good impact resistance: it can effectively absorb and disperse the impact energy of external force, reduce the damage of mica tape caused by external impact, and enhance the reliability of mica tape in actual application.

[0020] 3. Electrical properties, high insulation: mica itself is an excellent insulating material, and the stable structure of graphene makes the graphene-mica tape have excellent insulation performance, which can effectively prevent current leakage and improve the safety of electrical equipment. Low dielectric loss: under high frequency electric field, the dielectric loss of graphene-mica tape is low, which can reduce the loss of electric energy and improve the efficiency of electrical equipment.

[0021] 4. Thermal properties, high temperature resistance: mica has good high temperature resistance, and graphene can also remain stable at high temperatures, so graphene-mica tape can withstand high temperatures and remain structurally intact and stable in high temperature environments such as fire, playing a role in fireproofing and insulation. Good heat dissipation: the high thermal conductivity of graphene helps to quickly dissipate the heat generated during use of the mica tape, preventing heat accumulation and prolonging service life.

[0022] 5. Chemical stability, acid and alkali corrosion resistance: graphene-mica tape has strong resistance to acid, alkali and other chemicals and is not easily corroded, and can be used in harsh chemical environments. Strong oxidation resistance: not easily oxidized in air, can maintain stable performance for a long time, improving the durability of the material.

[0023] 6、The manufacturing process of the graphene mica tape of the present application is key to the dispersion of graphene, the treatment of mica sheets and the composite molding. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0025] In the embodiments of the present application,

[0026] Embodiment 1: A preparation method of a graphene mica tape, comprising the following steps:

[0027] Step 1: raw material preparation, mica paper,

[0028] Graphene material, the graphene material is selected from powders with a purity greater than 97wt% and a flake diameter of 0.8-25 μm;

[0029] Adhesive, selected from epoxy resin or silicone resin;

[0030] Step 2: graphene dispersion treatment, graphene material is added to the solvent, and mechanical stirring and ultrasonic dispersion are used to break the graphene agglomeration and form a uniform and stable graphene dispersion liquid, with a power setting of 200-500 W and a time setting of 30-60 minutes;

[0031] Step 3: gluing process, the composite adhesive containing graphene is uniformly coated on the surface of the reinforcing material, and the reinforcing material is selected from glass cloth;

[0032] Step 4: composite molding, the mica paper is combined with the reinforcing material coated with adhesive, and the two are tightly combined by rolling or other methods to form a preliminary composite layer structure;

[0033] Step 5: drying and curing treatment, the composite material is sent into a drying machine and dried at a temperature of 80-150℃;

[0034] Step 6: slitting and winding, the dried mica tape is cut to the required width by a slitting machine, and then wound into a roll by a winding machine to complete the finished product production;

[0035] Step 7: quality inspection, the appearance, thickness, temperature resistance, insulation strength and other indicators of the finished product are detected, and the product can be packaged and stored only after passing the inspection.

[0036] In step 2, a non-ionic surfactant is added, and the non-ionic surfactant is selected from polyoxyethylene octylphenol ether, and the solvent in step 2 is a liquid capable of dissolving graphene.

[0037] The amount of glue in step 3 needs to be controlled according to the thickness and performance requirements of the mica tape to ensure firm adhesion in the subsequent process.

[0038] In step 4, multi-layer composite is adopted. For example, two layers of mica paper sandwich a layer of reinforcing material to improve performance.

[0039] In step 5, the drying machine cures the adhesive, enhancing the integrity and mechanical strength of the mica tape.

[0040] Example 2: A method for preparing a graphene mica tape, comprising the following steps:

[0041] Step 1: Preparation of raw materials, mica paper,

[0042] Graphene material, the graphene material is selected from a powder with a purity greater than 97wt% and a flake diameter of 10μm;

[0043] Adhesive, selected from epoxy resin or silicone resin;

[0044] Step 2: Graphene dispersion treatment, add graphene material to the solvent, disperse by mechanical stirring and ultrasonic, power set to 350W, time set to 30-60 minutes, break the graphene agglomeration, form a uniform and stable graphene dispersion liquid;

[0045] Step 3: Gluing process, evenly coat the composite adhesive containing graphene on the surface of the reinforcing material, and the reinforcing material is selected from glass cloth;

[0046] Step 4: Composite molding, the mica paper is combined with the reinforcing material coated with adhesive, and the two are tightly combined by rolling or other methods to form a preliminary composite layer structure;

[0047] Step 5: Drying and curing treatment, the composite material is sent into the drying machine and dried at a temperature of 80-150℃;

[0048] Step 6: Slitting and winding, the dried mica tape is cut to the desired width by a slitting machine, and then wound into a roll by a winding machine to complete the finished product;

[0049] Step 7: Quality inspection, the finished product is inspected for appearance, thickness, temperature resistance, insulation strength and other indicators, and only after passing the inspection can it be packaged and stored.

[0050] In step 2, a non-ionic surfactant is added, and the non-ionic surfactant is selected from polyoxyethylene octylphenol ether. The solvent in step 2 is a liquid that can dissolve graphene.

[0051] The amount of glue in step 3 needs to be controlled according to the thickness and performance requirements of the mica tape to ensure firm adhesion in the subsequent process.

[0052] In step 4, multi-layer composite is adopted. For example, two layers of mica paper sandwich a layer of reinforcing material to improve performance.

[0053] In step 5, the drying machine cures the adhesive, enhancing the integrity and mechanical strength of the mica tape.

[0054] Example 3: A method for preparing a graphene mica tape, comprising the following steps:

[0055] Step 1: Preparation of raw materials, mica paper,

[0056] Graphene material, the graphene material is selected from a powder with a purity greater than 97wt% and a flake diameter of 25μm;

[0057] Adhesive, selected from epoxy resin or silicone resin;

[0058] Step 2: Graphene dispersion treatment, add graphene material to the solvent, disperse by mechanical stirring and ultrasonic, power set to 500W, time set to 30-60 minutes, break the graphene agglomeration, form a uniform and stable graphene dispersion liquid;

[0059] Step 3: Gluing process, evenly coat the composite adhesive containing graphene on the surface of the reinforcing material, and the reinforcing material is selected from glass cloth;

[0060] Step 4: Composite molding, the mica paper is combined with the reinforcing material coated with adhesive, and the two are tightly combined by rolling or other methods to form a preliminary composite layer structure;

[0061] Step 5: Drying and curing treatment, the composite material is sent into the drying machine and dried at a temperature of 80-150℃;

[0062] Step 6: Slitting and winding, the dried mica tape is cut to the required width by a slitting machine, and then wound into a roll by a winding machine to complete the finished product;

[0063] Step 7: Quality inspection, the finished product is inspected for appearance, thickness, temperature resistance, insulation strength and other indicators, and can be packaged and stored only after passing the inspection.

[0064] In step 2, a non-ionic surfactant is added, and the non-ionic surfactant is selected from polyoxyethylene octylphenol ether. The solvent in step 2 is a liquid that can dissolve graphene.

[0065] The amount of glue in step 3 needs to be controlled according to the thickness and performance requirements of the mica tape to ensure firm adhesion in the subsequent process.

[0066] In step 4, multi-layer composite is adopted. For example, two layers of mica paper sandwich a layer of reinforcing material to improve performance.

[0067] In step 5, the drying machine cures the adhesive, enhancing the integrity and mechanical strength of the mica tape.

[0068] Test experiment

[0069] The finished product was detected according to GB / T 5019.2-2009, the detection item was power frequency electrical strength (in normal air), and the detection result was 13.4 MV / m;

[0070] The detection item was tensile strength, and the detection result was 178 N / 10 mm;

[0071] The detection item was stiffness, and the detection result was 16.8 N / m;

[0072] The detection item was volume resistivity, and the detection result was 4.6*10 12 Ω·m;

[0073] The finished product was detected according to GB / T 29313-2012, the detection item was thermal conductivity (23 DEG C), and the detection result was 0.0946 W / (m*K);

[0074] The detection item was thermal conductivity (200 DEG C), and the detection result was 0.166 W / (m*K).

[0075] It is worth noting that the thickness of the sample for the test of "power frequency electrical strength (in normal air)" is (0.093-0.096) mm, the φ6 mm / φ6 mm cylindrical electrode system is adopted, the fast voltage boosting mode is adopted, the voltage boosting speed is 0.1 kV / s, and the test is carried out in normal air;

[0076] The thermal conductivity test sample is stacked to (1.90-1.97) mm for the test.

[0077] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for preparing graphene mica tape, characterized in that: Includes the following steps: Step 1: Raw material preparation, mica paper, Graphene material, the graphene material is selected from powder with a purity greater than 97wt% and a sheet diameter of 0.8μm-25μm; For adhesives, epoxy resin or silicone resin may be selected. Step 2: Graphene dispersion treatment. Add graphene material to solvent and disperse it by mechanical stirring and ultrasonication. Set the power to 200-500W and the time to 30-60 minutes to break up graphene agglomeration and form a uniform and stable graphene dispersion. Step 3: Adhesive application process, the graphene-containing composite adhesive is evenly applied to the surface of the reinforcing material, the reinforcing material is glass cloth; Step 4: Composite molding, the mica paper is bonded to the reinforcing material coated with adhesive, and the two are tightly bonded by means of rolling and pressing to form a preliminary composite layer structure; Step 5: Drying and curing treatment. The composite material is sent into a dryer and dried at a temperature of 80-150℃. Step 6: Slitting and winding. The dried mica tape is cut into the required width by a slitting machine and then wound into rolls by a winding machine to complete the finished product. Step 7: Quality inspection. The finished product is tested for indicators such as appearance, thickness, temperature resistance, and insulation strength. Only after passing the test can it be packaged and put into storage.

2. The method for preparing graphene mica tape according to claim 1, characterized in that: In step 2, a nonionic surfactant is added. The nonionic surfactant selected is polyoxyethylene octylphenol ether.

3. The method for preparing graphene mica tape according to claim 1, characterized in that: Multilayer composite is used in step 4.