CN115678062B - Graphene heating film and preparation method thereof - Google Patents
Graphene heating film and preparation method thereof Download PDFInfo
- Publication number
- CN115678062B CN115678062B CN202211217379.2A CN202211217379A CN115678062B CN 115678062 B CN115678062 B CN 115678062B CN 202211217379 A CN202211217379 A CN 202211217379A CN 115678062 B CN115678062 B CN 115678062B
- Authority
- CN
- China
- Prior art keywords
- graphene
- heating film
- microspheres
- particles
- sheets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 168
- 238000010438 heat treatment Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 49
- 239000004005 microsphere Substances 0.000 claims abstract description 46
- 238000009826 distribution Methods 0.000 claims abstract description 19
- 239000004814 polyurethane Substances 0.000 claims abstract description 14
- 229920002635 polyurethane Polymers 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 31
- 229960003638 dopamine Drugs 0.000 claims description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 238000000498 ball milling Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000002585 base Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 20
- 239000012065 filter cake Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000000227 grinding Methods 0.000 description 9
- 238000005470 impregnation Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000005002 finish coating Substances 0.000 description 3
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000001132 ultrasonic dispersion Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012767 functional filler Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of lithium battery thermal management components, and particularly relates to a graphene heating film and a preparation method thereof. The product developed by the invention comprises an aqueous polyurethane binder and graphene dispersed in the polyurethane binder; the graphene comprises two types of graphene particles with different morphologies; the graphene particles with different morphologies are respectively lamellar graphene sheets and spherical or spheroidal graphene microspheres; and the particle size distribution of the graphene microspheres is 80-120nm; the particle size distribution of the graphene sheets is 20-50nm; the mass ratio of the graphene microspheres to the graphene sheets is 3:4-3:7. in addition, the OI value of the graphene heating film is 45-60; the OI value is: XRD diffraction is adopted, and after a diffraction pattern is obtained, the ratio of the peak area of 004 characteristic peaks to the peak area of 110 peaks in the pattern is adopted as an OI value; the graphene microsphere is a hollow graphene microsphere.
Description
Technical Field
The invention belongs to the technical field of lithium battery thermal management components. More particularly, to a graphene heating film and a preparation method thereof.
Background
For lithium ion batteries, particularly lithium iron phosphate batteries, the battery needs to be heated in a low-temperature environment in winter to ensure the effective performance of the battery. In the traditional electric heating field, electric heating materials are mainly divided into two main types: metal resistance wires and ceramic heating materials. The metal resistance wire has the defects of high density, easy oxidation, low heat conversion efficiency, serious electromagnetic radiation and the like; and the alloy has poor processability and is not suitable for being used in the lithium battery environment. The ceramic heating material has the defects of low heating rate, great brittleness and poor shock resistance. Therefore, the novel hot spot material with the advantages of good flexibility, uniform heating, high electrothermal conversion efficiency and the like is researched, and has far-reaching significance for the long-term development of the lithium iron phosphate battery.
Graphene has the characteristics of good electric conduction and heat conduction properties, large specific surface area, high mechanical strength and the like, and is continuously applied to the fields of miniature electronic equipment, energy storage, composite materials and the like. Although graphene can be used to prepare a highly conductive, highly elastic graphene composite material. However, the layered graphene sheets are obtained by the conventional manufacturing process, and are directly used as main functional fillers of the heating film, so that not only the dispersion uniformity of the layered graphene sheets in a matrix is considered, but also the continuous heat conduction network can be formed among different graphene sheets, which is a contradiction body, the better dispersion performance is achieved, and the connection probability among the sheets is greatly reduced, so that the dispersion of the fillers is ensured, and meanwhile, the better heat conduction network structure is ensured, and the method is one of the technical problems in manufacturing the graphene heat conduction film.
Disclosure of Invention
The invention aims to overcome the defects that the conventional heating film product for lithium battery thermal management is difficult to consider uniform and efficient heat conduction performance, and provides a graphene heating film and a preparation method thereof.
The invention aims to provide a graphene heating film.
The invention further aims to provide a preparation method of the graphene heating film.
The above object of the present invention is achieved by the following technical scheme:
A graphene heating film, comprising: a waterborne polyurethane binder, and graphene dispersed in the polyurethane binder;
the graphene comprises two types of graphene particles with different morphologies;
the graphene particles with different morphologies are respectively lamellar graphene sheets and spherical or spheroidal graphene microspheres;
and the particle size distribution of the graphene microspheres is 80-120nm; the particle size distribution of the graphene sheets is 20-50nm;
The mass ratio of the graphene microspheres to the graphene sheets is 3:4-3:7.
According to the technical scheme, the aqueous polyurethane is used as the adhesive, and the spherical or spheroidal graphene microspheres with relatively larger particle sizes are bonded with the lamellar graphene sheets to obtain the continuous graphene heating film, and the adding amount of the graphene microspheres is limited to be smaller than that of the graphene sheets.
Firstly, after spherical or spheroidal graphene microspheres with relatively large particle diameters are freely filled under the action of an adhesive, spherical graphene particles are more likely to contact with each other, mainly point contact caused by a spherical structure, and lamellar graphene sheets are prone to contact with each other from surface to surface, but the probability of contact is low, particularly in the preparation process of an actual product, because uniform dispersion of graphene fillers in an adhesive system is considered, poor contact of single lamellar graphene sheets or too low contact area of contact sites of spherical graphene particles is likely to be caused; however, if the graphene particles and the lamellar graphene sheets are compounded, the lamellar graphene sheets of the small particles can act as heat transfer effect of adjacent graphene particles under the abutting of the spherical graphene particles, so that the contact area between the graphene particles and the lamellar graphene sheets of the small particles is enlarged, and a small amount of the graphene sheets of the small particles can be filled in gaps generated by the spherical particles and connected with the graphene sheets abutting on the adjacent graphene particles, so that the heat transfer effect is enhanced, and a three-dimensional heat transfer network is formed.
Further, the OI value of the graphene heating film is 45-60;
The OI value is: and (3) adopting XRD diffraction, and adopting the ratio of the peak area of 004 characteristic peaks to the peak area of 110 peaks in the spectrum as an OI value after obtaining the diffraction spectrum.
By controlling the OI value of the graphene heating film, specifically, controlling the OI value to be 45-60, the layered structure orientation of the layered graphene sheets in the film can be effectively regulated and controlled, so that the layered structure orientation of the layered graphene sheets is more prone to be distributed in a disordered state, if the OI value is smaller, the whole graphene sheets are more prone to be distributed perpendicular to a matrix, if the OI value is too large, the whole graphene sheets are more prone to be distributed parallel to the matrix, but in any distribution state, the orientation of the graphene sheets in the matrix is unified, and the unified distribution state is unfavorable for the coordination of effective and spherical graphene particles, so that an effective three-dimensional thermal diffusion network is formed.
Further, the mass of the aqueous polyurethane binder is as follows: the mass of the graphene sheet is as follows: the mass=8-10 of the graphene microsphere: 5-7:3-4.
Further, the graphene microsphere is a hollow graphene microsphere.
The hollow graphene microsphere has the advantages that heat is conducted on the wall surface of the hollow graphene microsphere, so that heat is conducted between the layered graphene sheets and the spherical graphene microsphere rapidly.
Furthermore, dopamine is adsorbed on the surface of the graphene sheet, and at least part of the graphene sheet is fixed on the surface of the graphene microsphere through the dopamine adsorption.
The preparation method of the graphene heating film comprises the following specific preparation steps:
Ultrasonically dispersing graphene particles and graphene sheets in a water-based polyurethane solution, and concentrating until the viscosity is 1800-2200 mPa.S after uniform dispersion to obtain a concentrated solution;
and (3) coating the obtained concentrated solution on the surface of the base film, drying, hot-pressing, cooling and rolling to obtain the product.
Further, the drying is as follows: and drying the substance coated on the surface of the base film until the water content is 5-10%.
Further, the hot pressing is: rolling at a speed of 150-300mm/min at 80-90deg.C and a pressure of 0.55-0.75 MPa.
The orientation of graphene sheet particles in the substrate is regulated and controlled in the proper category by regulating reasonable rolling process parameters.
Further, the preparation steps of the graphene particles include:
coating dopamine on the surface of spherical alumina microspheres with the particle size distribution of 80-120 nm;
ball-milling and mixing graphene oxide and the spherical alumina microspheres to obtain a spherical abrasive;
And (3) reducing the ball-milling material, soaking the ball-milling material with acid or alkali liquor to remove the alumina core, filtering, washing and drying to obtain the graphene particles.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
Preparation of graphene particles:
Dispersing spherical alumina microspheres with the particle size distribution of 80-120nm in a dopamine solution with the concentration of 2g/L, stirring and reacting for 2 hours at the rotating speed of 300r/min by using a stirrer, filtering, and collecting a filter cake to obtain the spherical alumina microspheres coated with dopamine;
Graphene oxide and spherical alumina microspheres are mixed according to the mass ratio of 1:1, mixing and pouring the mixture into a ball milling tank, wherein the ball material mass ratio is 15: adding zirconia ball milling beads into a ball milling tank, and ball milling and mixing for 30min to coat graphene oxide on the surfaces of spherical alumina microspheres to obtain a ball grinding material;
and (3) fully drying the obtained ball grinding material, reducing with hydrazine hydrate to reduce graphene oxide, and then carrying out microwave impregnation on the ball grinding material with hydrochloric acid solution or sodium hydroxide solution, wherein the microwave impregnation conditions are controlled as follows: the microwave power is 300W, and the time is 30min; after the impregnation is finished, filtering, collecting a filter cake, washing with deionized water, vacuum drying the washed filter cake, and screening out graphene particles with the particle size distribution of 80-120 nm;
pretreatment of graphene sheets:
Dispersing graphene sheets with particle size distribution of 20-50nm in dopamine solution with concentration of 2g/L, stirring with a stirrer at a rotating speed of 300r/min for reaction for 2 hours, filtering, and collecting filter cakes to obtain graphene sheets coated with dopamine, namely pretreated graphene sheets;
Preparation of the product:
the mass of the aqueous polyurethane binder is as follows: mass of the pretreated graphene sheet: mass=8 of graphene microsphere: 5:3, mixing the three materials, pouring the mixture into a mixer, performing ultrasonic dispersion for 20min under the condition of 50kHz ultrasonic frequency, and concentrating under reduced pressure under the condition of 400Pa and 65 ℃ until the material viscosity in the mixer reaches 1800 mPa.S to obtain concentrated solution;
Transferring the obtained concentrated solution into an extrusion coater, controlling the coating thickness to be 50 mu m so as to finish coating on the surface of a base film PET film, and drying the coated material until the water content is 5% to obtain a pre-dried coating film;
And hot-pressing the graphene heating film by using a pair of rollers, rolling the graphene heating film at the speed of 150mm/min under the conditions of the temperature of 80 ℃ and the pressure of 0.55MPa to adjust the OI value of the graphene heating film to be 45, and then cooling and rolling the graphene heating film sequentially to obtain the graphene heating film.
Example 2
Preparation of graphene particles:
dispersing spherical alumina microspheres with the particle size distribution of 80-120nm in a dopamine solution with the concentration of 3g/L, stirring and reacting for 3 hours at the rotating speed of 400r/min by using a stirrer, filtering, and collecting a filter cake to obtain the spherical alumina microspheres coated with dopamine;
Graphene oxide and spherical alumina microspheres are mixed according to the mass ratio of 1:1, mixing and pouring the mixture into a ball milling tank, wherein the ball material mass ratio is 18: adding zirconia ball milling beads into a ball milling tank, and ball milling and mixing for 45min to coat graphene oxide on the surfaces of spherical alumina microspheres to obtain a ball grinding material;
And (3) fully drying the obtained ball grinding material, reducing with hydrazine hydrate to reduce graphene oxide, and then carrying out microwave impregnation on the ball grinding material with hydrochloric acid solution or sodium hydroxide solution, wherein the microwave impregnation conditions are controlled as follows: the microwave power is 320W, and the time is 32min; after the impregnation is finished, filtering, collecting a filter cake, washing with deionized water, vacuum drying the washed filter cake, and screening out graphene particles with the particle size distribution of 80-120 nm;
pretreatment of graphene sheets:
Dispersing graphene sheets with particle size distribution of 20-50nm in a dopamine solution with concentration of 3g/L, stirring and reacting for 3 hours at a rotating speed of 400r/min by using a stirrer, filtering, and collecting filter cakes to obtain graphene sheets coated with dopamine, namely pretreated graphene sheets;
Preparation of the product:
The mass of the aqueous polyurethane binder is as follows: mass of the pretreated graphene sheet: mass=9 of graphene microsphere: 6:4, mixing the three materials, pouring the mixture into a mixer, performing ultrasonic dispersion for 30min under the condition of ultrasonic frequency of 60kHz, and concentrating under reduced pressure under the condition of pressure of 450Pa and temperature of 70 ℃ until the material viscosity in the mixer reaches 2000 mPa.S to obtain concentrated solution;
transferring the obtained concentrated solution into an extrusion coater, controlling the coating thickness to be 60 mu m so as to finish coating on the surface of a base film PET film, and drying the coated material until the water content is 8% to obtain a pre-dried coating film;
And hot-pressing the graphene heating film by using a pair of rollers, rolling at the speed of 200mm/min under the conditions that the temperature is 85 ℃ and the pressure is 0.65MPa to adjust the OI value of the graphene heating film product to be 50, and then cooling and rolling sequentially to obtain the graphene heating film product.
Example 3
Preparation of graphene particles:
dispersing spherical alumina microspheres with the particle size distribution of 80-120nm in a dopamine solution with the concentration of 4g/L, stirring and reacting for 4 hours at the rotating speed of 500r/min by using a stirrer, filtering, and collecting a filter cake to obtain the spherical alumina microspheres coated with dopamine;
Graphene oxide and spherical alumina microspheres are mixed according to the mass ratio of 1:1, mixing and pouring the mixture into a ball milling tank, wherein the ball material mass ratio is 20: adding zirconia ball milling beads into a ball milling tank, and ball milling and mixing for 60 minutes to coat graphene oxide on the surfaces of spherical alumina microspheres to obtain a ball grinding material;
And (3) fully drying the obtained ball grinding material, reducing with hydrazine hydrate to reduce graphene oxide, and then carrying out microwave impregnation on the ball grinding material with hydrochloric acid solution or sodium hydroxide solution, wherein the microwave impregnation conditions are controlled as follows: the microwave power is 350W, and the time is 35min; after the impregnation is finished, filtering, collecting a filter cake, washing with deionized water, vacuum drying the washed filter cake, and screening out graphene particles with the particle size distribution of 80-120 nm;
pretreatment of graphene sheets:
Dispersing graphene sheets with particle size distribution of 20-50nm in a dopamine solution with concentration of 4g/L, stirring and reacting for 4 hours at a rotating speed of 500r/min by using a stirrer, filtering, and collecting filter cakes to obtain graphene sheets coated with dopamine, namely pretreated graphene sheets;
Preparation of the product:
The mass of the aqueous polyurethane binder is as follows: mass of the pretreated graphene sheet: mass=10 of graphene microsphere: 7:3, mixing the three materials, pouring the mixture into a mixer, performing ultrasonic dispersion for 40min under the condition of the ultrasonic frequency of 70kHz, and concentrating the mixture under the condition of the pressure of 500Pa and the temperature of 75 ℃ under reduced pressure until the material viscosity in the mixer reaches 2200 mPa.S to obtain concentrated solution;
Transferring the obtained concentrated solution into an extrusion coater, controlling the coating thickness to be 80 mu m so as to finish coating on the surface of a base film PET film, and drying the coated material until the water content is 10% to obtain a pre-dried coating film;
and hot-pressing the graphene heating film by using a pair of rollers, rolling the graphene heating film at the speed of 300mm/min under the conditions of the temperature of 90 ℃ and the pressure of 0.75MPa to adjust the OI value of the graphene heating film product to be 60, and then cooling and rolling the graphene heating film product sequentially to obtain the graphene heating film product.
Example 4
The difference between this embodiment and embodiment 1 is that: rolling at a speed of 150mm/min under the conditions of a temperature of 75 ℃ and a pressure of 0.48MPa to adjust the OI value of the graphene heating film product to 39; the remaining conditions remain unchanged.
Example 5
The difference between this embodiment and embodiment 1 is that: and rolling at the speed of 300mm/min under the conditions of the temperature of 95 ℃ and the pressure of 0.8MPa to adjust the OI value of the graphene heating film product to 66, and keeping the other conditions unchanged.
Example 6
The difference between this embodiment and embodiment 1 is that: in the pretreatment process of the graphene sheet, deionized water with the same quality is adopted to replace a dopamine solution, and the rest conditions are kept unchanged.
Comparative example 1
The difference between this comparative example and example 1 is that: the graphene microspheres are replaced by pretreated graphene sheets with equal quality, and the rest conditions are kept unchanged.
Comparative example 2
The difference between this comparative example and example 1 is that: the graphene microspheres with equal quality are adopted to replace the pretreated graphene sheets, and the rest conditions are kept unchanged.
The products obtained in examples 1-6 and comparative examples 1-2 were subjected to performance tests, and specific test methods and test results are as follows:
Attaching copper electrodes to the surfaces of the products obtained in the embodiment and the comparative example respectively, and then welding wires on the surfaces of the copper electrodes, wherein the product in the embodiment or the comparative example for testing is a sample with the length of 20cm and the width of 10cm, and the temperature change in the use process is detected by a temperature inspection instrument at the center point and four opposite angles of the sample;
Specifically, after packaging the product with the copper electrode, connecting the product with the copper electrode into a direct current power supply, regulating the voltage to 10.5V, after the temperature of the central point of the heating film is increased from 25 ℃ to 55 ℃, disconnecting the power supply, naturally cooling to 25 ℃, repeating the cycle for 10 times, testing the time t1 required for reaching 55 ℃ from 25 ℃ for the first time and the time t2 required for reaching 55 ℃ from 25 ℃ for the 10 th time, and calculating the time difference of the central point for two times to be t1-t2, wherein the specific test results are shown in the following table 1;
In addition, after the first center point temperature was raised to 55 ℃, the temperatures of the other four opposite corners thereof were detected, and specific test results are shown in table 2;
Table 1: product center point performance test results
| Time difference/s | |
| Example 1 | 5.5 |
| Example 2 | 5.2 |
| Example 3 | 5.3 |
| Example 4 | 6.4 |
| Example 5 | 6.6 |
| Example 6 | 6.3 |
| Comparative example 1 | 15.6 |
| Comparative example 2 | 15.8 |
Table 2: temperature test results for different positions of product
| 1# Diagonal/. Degree.C | 2# Diagonal/. Degree.C | 3# Diagonal/. Degree.C | 4# Diagonal/. Degree.C | |
| Example 1 | 54.8 | 54.8 | 54.9 | 54.8 |
| Example 2 | 54.8 | 54.9 | 54.8 | 54.8 |
| Example 3 | 54.9 | 54.8 | 54.8 | 54.9 |
| Example 4 | 54.6 | 54.5 | 54.6 | 54.7 |
| Example 5 | 54.7 | 54.5 | 54.7 | 54.7 |
| Example 6 | 54.6 | 54.5 | 54.7 | 54.5 |
| Comparative example 1 | 52.6 | 52.4 | 52.7 | 52.5 |
| Comparative example 2 | 53.2 | 53.4 | 52.9 | 53.6 |
As shown by the test results in Table 1, the product obtained by the invention can obtain more uniform heat conduction effect and higher heat conduction efficiency.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (7)
1. A graphene heating film, comprising: a waterborne polyurethane binder, and graphene dispersed in the polyurethane binder;
the graphene comprises two types of graphene particles with different morphologies;
the graphene particles with different morphologies are respectively lamellar graphene sheets and spherical or spheroidal graphene microspheres; the graphene microspheres are hollow graphene microspheres;
and the particle size distribution of the graphene microspheres is 80-120nm; the particle size distribution of the graphene sheets is 20-50nm;
The mass ratio of the graphene microspheres to the graphene sheets is 3:4-3:7, preparing a base material; dopamine is adsorbed on the surface of the graphene sheet, and at least part of the graphene sheet is fixed on the surface of the graphene microsphere through the dopamine adsorption.
2. The graphene heating film according to claim 1, wherein the graphene heating film has an OI value of 45-60;
The OI value is: and (3) adopting XRD diffraction, and adopting the ratio of the peak area of 004 characteristic peaks to the peak area of 110 peaks in the spectrum as an OI value after obtaining the diffraction spectrum.
3. The graphene heating film according to claim 1, wherein the mass of the aqueous polyurethane binder: the mass of the graphene sheet is as follows: the mass=8-10 of the graphene microsphere: 5-7:3-4.
4. A method for preparing a graphene heating film according to any one of claims 1 to 3, wherein the specific preparation steps include:
Ultrasonically dispersing graphene particles and graphene sheets in a water-based polyurethane solution, and concentrating until the viscosity is 1800-2200 mPa.S after uniform dispersion to obtain a concentrated solution;
and (3) coating the obtained concentrated solution on the surface of the base film, drying, hot-pressing, cooling and rolling to obtain the product.
5. The method for preparing a graphene heating film according to claim 4, wherein the drying is: and drying the substance coated on the surface of the base film until the water content is 5-10%.
6. The method for preparing a graphene heating film according to claim 4, wherein the hot pressing is: rolling at a speed of 150-300mm/min at 80-90deg.C and a pressure of 0.55-0.75 MPa.
7. The method for preparing a graphene heating film according to claim 4, wherein the step of preparing graphene particles comprises:
coating dopamine on the surface of spherical alumina microspheres with the particle size distribution of 80-120 nm;
ball-milling and mixing graphene oxide and the spherical alumina microspheres to obtain a spherical abrasive;
And (3) reducing the ball-milling material, soaking the ball-milling material with acid or alkali liquor to remove the alumina core, filtering, washing and drying to obtain the graphene particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211217379.2A CN115678062B (en) | 2022-10-03 | 2022-10-03 | Graphene heating film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211217379.2A CN115678062B (en) | 2022-10-03 | 2022-10-03 | Graphene heating film and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115678062A CN115678062A (en) | 2023-02-03 |
| CN115678062B true CN115678062B (en) | 2024-04-19 |
Family
ID=85065197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211217379.2A Active CN115678062B (en) | 2022-10-03 | 2022-10-03 | Graphene heating film and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115678062B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114957897A (en) * | 2022-06-27 | 2022-08-30 | 苏福（深圳）科技有限公司 | High-performance graphene film and preparation method thereof |
-
2022
- 2022-10-03 CN CN202211217379.2A patent/CN115678062B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114957897A (en) * | 2022-06-27 | 2022-08-30 | 苏福（深圳）科技有限公司 | High-performance graphene film and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115678062A (en) | 2023-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103066243B (en) | Coke powder-based cathode material of lithium ion power battery and preparation method thereof | |
| CN109103433B (en) | Nitrogen-doped carbon-coated lithium iron phosphate composite material and preparation method thereof | |
| CN112289986B (en) | Preparation method of high-rate quick-charging graphite negative electrode material | |
| CN102975417A (en) | Thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and preparation method thereof | |
| CN113659125B (en) | Silicon-carbon composite material and preparation method thereof | |
| CN111525117B (en) | Three-dimensional porous carbon coated Co3O4The negative electrode material of the sodium ion battery and the preparation method thereof | |
| CN109167025A (en) | A kind of modified soft carbon cladding negative electrode material and preparation method thereof of boron doping under high and low temperature environment with high stability | |
| CN111430687A (en) | Carbon-coated lithium iron phosphate composite material, preparation method thereof and lithium ion battery | |
| CN115678062B (en) | Graphene heating film and preparation method thereof | |
| CN113206221A (en) | Lithium battery, lithium battery pole piece and preparation method thereof | |
| CN111785920A (en) | Negative active material, preparation and application thereof | |
| CN113213448B (en) | High-specific-capacity lithium iron phosphate electrode material and preparation method thereof | |
| CN110372980B (en) | Manufacturing method of PTFE ceramic composite substrate with low water absorption and high copper foil adhesive force | |
| CN110944416A (en) | Graphene composite slurry, heating coating and preparation method thereof | |
| CN111491501A (en) | Electromagnetic shielding material with conductive polymer coated with nickel ferrite and preparation method thereof | |
| CN114843432B (en) | Low-iron-phosphorus-ratio sodium iron phosphate@carbon nanotube anode material and preparation method thereof | |
| CN111117305A (en) | Graphene composite slurry, heating coating and preparation method thereof | |
| CN105036728B (en) | A kind of preparation method of conductive coating Li ferrite hot spraying powder | |
| CN114524424A (en) | Preparation method of high-compaction high-capacity lithium iron phosphate positive electrode material | |
| CN111063477B (en) | Stainless steel substrate thick film circuit insulating medium slurry and preparation method thereof | |
| CN114155992A (en) | High-adhesion conductive silver paste for ceramic matrix composite and preparation method thereof | |
| CN112694078A (en) | Graphene-coated lithium iron phosphate composite material and preparation method thereof | |
| CN112940678A (en) | Electromagnetic wave absorbing material with nickel nano particles coated by porous carbon spheres and preparation method thereof | |
| CN113059834A (en) | Preparation method of pearl shell-imitated electromagnetic wave absorption film | |
| CN111303672A (en) | Graphene high-temperature-resistant heat exchange enhanced coating, preparation method and coating method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240325 Address after: 835000 Plant 7, Qingyu Information Industrial Park, Qingshuihe Supporting Park, Khorgos Economic Development Zone, Ili Kazak Autonomous Prefecture, Xinjiang Uygur Autonomous Region Applicant after: Xinjiang Juge New Energy Technology Co.,Ltd. Country or region after: China Address before: No. 815, geguan Road, Getang street, Liuhe District, Nanjing, Jiangsu 210000 Applicant before: Huang Dongmei Country or region before: China |
|
| GR01 | Patent grant |