CN112442217B - High-thermal-conductivity rubber nano composite material and preparation method thereof - Google Patents
High-thermal-conductivity rubber nano composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-thermal-conductivity rubber nanocomposite and a preparation method thereof. The composite material is prepared from the following raw materials: 100 parts by weight of rubber latex; 0.5-20 parts by weight of graphene oxide aqueous dispersion; 5-500 parts by weight of a nano heat-conducting filler; 1-40 parts by weight of a reducing agent; 0.01-10 parts by weight of an emulsifier; 0.1-5 parts by weight of a vulcanizing agent. According to the invention, the nanometer heat-conducting filler and the rubber latex particles are guided to form a three-dimensional network through graphene oxide gelation, and then the network is subjected to hot pressing to prepare the high-heat-conducting rubber composite material containing the three-dimensional filler network, so that the heat-conducting property is greatly improved.
Description
Technical Field
The invention relates to the technical field of rubber, in particular to a graphene oxide hydrogel guided nano particle filled hot-pressing type high-thermal-conductivity rubber nano composite material.
Background
As electronic appliances are continuously miniaturized/have high power consumption, the electronic appliances have higher and higher energy density, which causes a large amount of heat to be generated during the use process, and if the heat cannot be timely led out, the electronic appliances are jammed or even the circuit is damaged. In order to achieve effective thermal management, a thermal interface material is filled between the electronic chip (heat-emitting end) and the heat sink to eliminate a small gap generated between the surfaces of the electronic chip and the heat sink, so as to improve the heat transfer efficiency from the chip to the heat-dissipating end.
The rubber material is a material with intrinsic high flexibility and high elasticity, and is an excellent substrate used as a thermal interface material. At present, thermal interface materials using liquid silicone rubber as a matrix have been widely used. However, various general-purpose rubbers, such as natural rubber, styrene butadiene rubber, etc., are limited by processing methods and have low thermal conductivity, and no suitable high thermal conductivity product is available. The traditional double-roller mixing processing method can effectively disperse the nano filler in a matrix, so that the rubber material has excellent dynamic and static mechanical properties and can meet the comprehensive performance of products such as tires and the like serving under dynamic working conditions. However, excessive dispersion is not beneficial to the formation of a filler network in a system and the improvement of the heat conductivity of the material. And the improvement of the heat conductivity of the rubber material also has important significance for timely heat dissipation and service life prolonging of products serving under certain dynamic conditions and improvement of the comfort and wearability of the sole rubber material.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-thermal-conductivity rubber nano composite material and a preparation method thereof. The nanometer heat-conducting filler and the rubber latex particles are guided to form a three-dimensional network through graphene oxide gelation, and then the network is subjected to hot pressing to prepare the high-heat-conducting rubber composite material containing the three-dimensional filler network, so that the heat-conducting property is greatly improved.
One of the purposes of the invention is to provide a high-thermal-conductivity rubber nanocomposite.
The composite material is prepared from the following raw materials:
the components are calculated according to the parts by weight,
wherein, the first and the second end of the pipe are connected with each other,
the graphene oxide referred to in the present invention generally refers to graphene oxide prepared by various conventional methods (such as modified hummers method), wherein the graphene oxide concentration in the preferred graphene oxide aqueous dispersion is 2mg/ml-10 mg/ml; the graphene oxide dispersion is adjusted to be alkaline with a base, preferably with a PH in the range of 8 to 12.
The rubber latex in the invention can be selected from all rubber latexes in the prior art, and is preferably one or a combination of natural latex, styrene-butadiene latex, butyronitrile latex, chloroprene latex, cis-butadiene latex, epoxidized natural rubber latex, butadiene-pyrene latex, carboxyl butyronitrile latex, acrylic latex, silica gel latex, polyurethane latex and the like.
The nano filler in the invention is one or a combination of nano alumina, nano zinc oxide, nano diamond, nano silicon dioxide, nano carbon black, nano aluminum nitride, nano silicon carbide and nano carbon tube filler; the average grain diameter of the nanometer heat conduction filler is between 5nm and 500 nm.
The reducing agent in the invention can be selected from all graphene reducing agents in the prior art, and is preferably one or a combination of ascorbic acid, ethylenediamine and pyrrole.
The emulsifier in the invention can be selected from conventional emulsifiers in the field, and the preferred emulsifier is one or more of alkylphenol polyoxyethylene ether (OP, NP, TX) series emulsifier, fatty alcohol polyoxyethylene ether (AEO) series emulsifier, (peregal) series emulsifier, sorbitan fatty acid ester polyoxyethylene ether (Tween series) emulsifier, sorbitan fatty acid ester (span series) emulsifier, coconut oil diethanolamide (6501) emulsifier and the like.
The vulcanizing agent in the invention can be selected from the vulcanizing agents which are available in the prior art, and preferably, the vulcanizing agent is one or more of common rubber crosslinking agents such as sulfur, dicumyl peroxide, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and the like.
The formulations of the invention may also comprise conventional auxiliaries, such as: the dosage of the activating agent, the accelerator, the anti-aging agent and the like is also conventional, and the technical personnel can adjust the dosage according to the actual situation.
The activating agent in the invention can be selected from activating agents conventional in the prior art, and preferably, the activating agent is one or more of common rubber activating agents such as zinc oxide, magnesium oxide, zinc carbonate, zinc hydroxide, organic zinc, stearic acid and the like.
The accelerator used in the present invention may be any conventional accelerator in the prior art, and preferably one or more of conventional rubber accelerators such as accelerator DM (benzothiazole disulfide), accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), accelerator NS (N-tert-butyl-2-benzothiazole sulfenamide), accelerator TMTD (tetramethylthiuram disulfide), accelerator TMTM (tetramethylthiuram monosulfide), accelerator DTDM (4, 4 '-dithiodimorpholine), accelerator D (1, 3-diphenylguanidine), accelerator NOBS (N- (oxydiethylene) -2-benzothiazole sulfenamide) and accelerator DM (2, 2' -dithiodibenzothiazole) are used.
The antioxidant in the invention can be selected from the conventional antioxidants in the prior art, and preferably one or more of common rubber accelerators such as antioxidant 4010NA (N-isopropyl-N '-phenyl-p-phenylenediamine), antioxidant RD (2,2, 4-trimethyl-1, 2-dihydroquinoline polymer), antioxidant 4020(N- (1, 3-dimethyl) butyl-N' -phenyl-p-phenylenediamine), antioxidant AW (6-ethoxy-2, 2, 4-trimethyl-1, 2-dihydroquinoline), antioxidant D (N-phenyl-beta-naphthylamine), antioxidant TPPD (N-N-phenyl-p-phenylenediamine) and the like.
The preferred amounts in the present invention are (based on 100 parts by weight of the rubber latex):
0.5-10 parts by weight of an activator; more preferably 1 to 5 parts by weight;
0.1-5 parts by weight of an accelerator; more preferably 0.5 to 3 parts by weight;
0.5-5 parts of anti-aging agent; more preferably 1 to 2 parts by weight.
The second purpose of the invention is to provide a preparation method of the high heat conduction rubber nano composite material.
The method comprises the following steps:
uniformly mixing the graphene oxide aqueous dispersion and the nano filler, adding other components according to the using amount, and uniformly stirring; reducing to obtain hydrogel; and washing, drying and vulcanizing the hydrogel to obtain the high-thermal-conductivity rubber nanocomposite.
Among them, preferred are:
the reduction temperature is 70-98 ℃; more preferably 70-95 ℃, and the reduction time is 30min-12 h; more preferably 30min-6 h.
The addition method of each component other than the graphene oxide aqueous dispersion is not particularly limited, and the components may be directly added or added in the form of a dispersion.
The basic principle of the invention is to guide the nanometer heat-conducting filler and the rubber latex particles to form a three-dimensional network by utilizing the characteristic that graphene oxide sheets can be mutually overlapped to form hydrogel in a weak reduction state. Firstly, the nano particles are coated on the surface of graphene oxide by utilizing the electrostatic interaction between the graphene oxide and the nano particles, and the graphene oxide nano particle hybrid filler water slurry is prepared. And then adding latex particles, and carrying out thermal reduction, wherein in the process of forming the hydrogel, as the particle size of the nano particles is very small (nano level) and the particle size of the latex particles is relatively large (micron level), the nano heat-conducting particles are wrapped on the surfaces of the latex particles along with the graphene to form a three-dimensional filler network. The hydrogel is directly dried in an oven to obtain a regular gel block. The dried gel is hot-pressed and vulcanized, and the vulcanized rubber nano composite material greatly improves the heat-conducting property of the material because the internal filler forms a three-dimensional heat-conducting network.
The technical scheme adopted by the invention is as follows:
the first step is as follows: uniformly stirring or ultrasonically mixing the graphene oxide aqueous dispersion and the nano filler, adding a reducing agent, an emulsifier, a vulcanizing agent, an activator, an accelerator, an anti-aging agent, rubber latex and the like, and uniformly stirring. And (3) putting the uniformly stirred slurry into a constant temperature environment (in an oven, a water bath or an oil bath kettle) at 70-98 ℃ for reduction for 30min-12h to obtain the hydrogel. The second step is that: and fully washing the obtained hydrogel with purified water, drying the hydrogel in an oven, and putting the dried gel in a flat vulcanizing machine for hot-press vulcanization to obtain the high-heat-conductivity rubber composite material.
The vulcanization conditions (vulcanization pressure, vulcanization temperature and vulcanization time) of the hot-pressing vulcanization are determined according to the dosage of different rubbers, different vulcanizing agents and different accelerators.
The vulcanizing agent, the activating agent, the accelerator, the anti-aging agent and other small materials related by the invention are not limited by the adding method, can be directly added, and can also be prepared into a stable aqueous dispersion commonly used in the latex product industry in advance for adding; the addition amount of the small materials is reasonably determined according to the parts of the added rubber, and normal vulcanization can be ensured.
The invention has the advantages of
1. The invention utilizes the characteristic of graphene oxide gelation to guide the heat-conducting filler to form a three-dimensional structure, is beneficial to improving the heat-conducting property of the product, and has mild condition and easy large-scale production.
2. The hydrogel obtained by the method can be directly dried in a drying oven by hot air, freeze drying or vacuum drying is not involved, the operation is simple and convenient, and the energy consumption is lower.
3. The invention creates a new idea of rubber latex blending, namely, latex is introduced into graphene hydrogel, the gelation process is a rubber flocculation process, the traditional demulsification and rubber flocculation process is omitted, and the rubber latex blending method has certain advantages in process.
Drawings
FIG. 1 is a schematic Scanning Electron Microscope (SEM) view of the brittle fracture surface of the composite material prepared in example 1;
FIG. 2 is a schematic view of the brittle fracture surface of the composite material prepared in example 2 under a scanning electron microscope.
Detailed Description
While the present invention will be described in detail and with reference to the specific embodiments thereof, it should be understood that the following detailed description is merely illustrative of the present invention and should not be taken as limiting the scope of the present invention, but is intended to cover modifications and variations thereof that would occur to those skilled in the art upon reading the present disclosure.
Comparative example 1
The specific formula is as follows:
the components are calculated according to the parts by weight,
the specific implementation process is as follows:
10g of crude rubber of natural rubber, 0.4g of zinc oxide, 0.1g of sulfur, 0.2g of accelerator D, 0.4g of anti-aging agent 4020 and 5g of nano-alumina are blended on a double-roll open mill to obtain the alumina-filled rubber composite material. And then placing the rubber composite material into a flat vulcanizing machine for mold pressing vulcanization, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Comparative example 2
The specific formula is as follows:
the components are calculated according to the parts by weight,
the specific implementation process is as follows:
10g of styrene butadiene rubber raw rubber is added into a double-roll open mill, 10.04g of nano zinc oxide powder, 0.1g of sulfur powder, 0.2g of accelerator D and 0.4g of antioxidant AW are uniformly added and mixed. Placing the obtained rubber-based nano composite material in a flat vulcanizing machine for hot-press vulcanization to obtain the rubber nano composite material, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
The drugs used in the examples are all common commercial products.
Example 1
The specific formula is as follows:
the components are counted by weight part, and the weight percentage is,
the specific implementation process is as follows:
100ml of graphene oxide aqueous dispersion with the concentration of 2mg/ml (the PH value of the graphene oxide aqueous dispersion is adjusted to 10.5) and 100ml of nano alumina aqueous dispersion with the concentration of 50mg/ml are stirred and ultrasonically mixed uniformly, and 2g of ascorbic acid, 0.05 g of Triton X-100 emulsifier, 16.67 g of natural rubber latex (with the rubber content of 60 wt%), 0.05 g of sulfur aqueous dispersion (with the sulfur content of 20 wt%), 0.2g of zinc oxide aqueous dispersion (with the zinc oxide content of 20 wt%), 0.1g of accelerator D aqueous dispersion (with the accelerator D content of 20 wt%), 0.2g of antioxidant AW aqueous dispersion (with the AW content of 20 wt%) and the like are sequentially added and stirred uniformly. And sealing the slurry which is uniformly stirred, and putting the slurry into a blowing drying oven at the temperature of 90 ℃ for reduction for 2 hours to obtain the hydrogel. The second step: and fully washing the obtained hydrogel with purified water, drying the hydrogel in a 60 ℃ blast oven, putting the dried gel in a flat vulcanizing machine, and carrying out hot-pressing vulcanization on the gel to obtain the high-thermal-conductivity rubber composite material with the thickness of 1mm, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Example 2
The specific formula is as follows:
the components are counted by weight part, and the weight percentage is,
the specific implementation process is as follows:
100ml of graphene oxide aqueous dispersion with the concentration of 10mg/ml (the PH value of the graphene oxide aqueous dispersion is adjusted to be 8) and 100ml of nano zinc oxide aqueous dispersion with the concentration of 100mg/ml are stirred and ultrasonically mixed uniformly, and 2g of ethylenediamine, 0.5 g of sorbitan fatty acid ester emulsifier, 16.67 g of styrene butadiene rubber latex (with the rubber content of 60 wt%), 0.05 g of sulfur aqueous dispersion (with the sulfur content of 20 wt%), 0.2g of zinc oxide aqueous dispersion (with the zinc oxide content of 20 wt%), 0.1g of accelerator D aqueous dispersion (with the accelerator D content of 20 wt%), 0.2g of antioxidant AW aqueous dispersion (with the AW content of 20 wt%) and the like are sequentially added and stirred uniformly. And sealing the uniformly stirred slurry, and putting the slurry into a forced air drying oven at the temperature of 80 ℃ for reduction for 6 hours to obtain the hydrogel. The second step is that: and fully washing the obtained hydrogel with purified water, drying the hydrogel in a 60 ℃ blast oven, putting the dried gel in a flat vulcanizing machine, and carrying out hot-pressing vulcanization on the dried gel to obtain the high-heat-conductivity rubber composite material with the thickness of 1mm, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Example 3
The specific formula is as follows:
the components are calculated according to the parts by weight,
the specific implementation process is as follows:
100ml of graphene oxide aqueous dispersion with the concentration of 10mg/ml (the PH value of the graphene oxide aqueous dispersion is adjusted to 11) and 100ml of carbon nanotube aqueous dispersion with the concentration of 150mg/ml are stirred and ultrasonically mixed uniformly, and 4g of ascorbic acid, 1g of sorbitan fatty acid ester polyoxyethylene ether emulsifier, 16.67 g of nitrile rubber latex (with the gel content of 60 wt%), 0.05 g of sulfur aqueous dispersion (with the sulfur content of 20 wt%), 0.2g of zinc oxide aqueous dispersion (with the zinc oxide content of 20 wt%), 0.1g of accelerator D aqueous dispersion (with the accelerator D content of 20 wt%), 0.2g of antioxidant AW aqueous dispersion (with the AW content of 20 wt%) and the like are sequentially added and stirred uniformly. And sealing the slurry which is uniformly stirred, and putting the slurry into a 70 ℃ forced air drying oven to be reduced for 6 hours to obtain the hydrogel. The second step: and fully washing the obtained hydrogel with purified water, drying the hydrogel in a 60 ℃ blast oven, putting the dried gel in a flat vulcanizing machine, and carrying out hot-pressing vulcanization on the dried gel to obtain the high-heat-conductivity rubber composite material with the thickness of 1mm, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Example 4
The specific formula is as follows:
the components are calculated according to the parts by weight,
the specific implementation process is as follows:
100ml of graphene oxide aqueous dispersion with the concentration of 10mg/ml (the PH value of the graphene oxide aqueous dispersion is adjusted to 12) and 100ml of nano-diamond aqueous dispersion with the concentration of 200mg/ml are stirred and ultrasonically mixed uniformly, and 2g of pyrrole, 0.1g of fatty alcohol-polyoxyethylene ether emulsifier, 16.67 g of butadiene rubber latex (with the rubber content of 60 wt%), 0.05 g of sulfur aqueous dispersion (with the sulfur content of 20 wt%), 0.2g of zinc oxide aqueous dispersion (with the zinc oxide content of 20 wt%), 0.1g of accelerator D aqueous dispersion (with the accelerator D content of 20 wt%), 0.2g of antioxidant AW aqueous dispersion (with the AW content of 20 wt%) and the like are sequentially added and stirred uniformly. And sealing the slurry which is uniformly stirred, and putting the slurry into a 95 ℃ forced air drying oven to be reduced for 30min to obtain the hydrogel. The second step is that: and fully washing the obtained hydrogel with purified water, drying the hydrogel in a 60 ℃ blast oven, putting the dried gel in a flat vulcanizing machine, and carrying out hot-pressing vulcanization on the gel to obtain the high-thermal-conductivity rubber composite material with the thickness of 1mm, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Example 5
The specific formula is as follows:
the components are calculated according to the parts by weight,
the specific implementation process is as follows:
100ml of graphene oxide aqueous dispersion with the concentration of 10mg/ml (the PH value of the graphene oxide aqueous dispersion is adjusted to 12) and 100ml of nano-diamond aqueous dispersion with the concentration of 2500mg/ml are stirred and ultrasonically mixed uniformly, 2g of pyrrole, 1g of fatty alcohol-polyoxyethylene ether emulsifier, 166.7 g of epoxidized natural rubber latex (with the gel content of 60 wt%), 5g of sulfur aqueous dispersion (with the sulfur content of 20 wt%), 20 g of zinc oxide aqueous dispersion (with the zinc oxide content of 20 wt%), 10g of accelerator D aqueous dispersion (with the accelerator D content of 20 wt%) and 20 g of antioxidant AW aqueous dispersion (with the AW content of 20 wt%) are sequentially added and stirred uniformly. And sealing the uniformly stirred slurry, and putting the slurry into a 95 ℃ forced air drying oven to reduce for 30min to obtain the hydrogel. The second step is that: and fully washing the obtained hydrogel with purified water, drying the hydrogel in a 60 ℃ blast oven, putting the dried gel in a flat vulcanizing machine, and carrying out hot-pressing vulcanization on the gel to obtain the high-thermal-conductivity rubber composite material with the thickness of 1mm, wherein the vulcanization pressure is 15MPa, the vulcanization temperature is 150 ℃, and the vulcanization time is 20 min.
Description of the test results
As can be seen from fig. 1 and 2, the internal structure of the rubber nanocomposite obtained by the gel drying method in the example contains a three-dimensional network structure of fillers, and the latex particles are dispersed in the gel network. The network structure cannot be realized by the traditional processing method, and according to the theory of heat conduction paths, the heat conduction filler of the rubber material prepared by the traditional method tends not to be randomly distributed, so that the heat conduction filler is not beneficial to the transfer of heat among the fillers; the material prepared by the invention can transfer heat in a three-dimensional network of the heat-conducting filler, so that the heat conductivity of the rubber matrix is greatly improved.
Comparing the thermal conductivity data of the samples prepared by the two-roll mill (comparative examples 1-2) and the gel-drying process (examples 1-5), the mechanical shear force of the two-roll mill breaks down the three-dimensional network of fillers, thereby reducing the positive effect of the fillers on the formation of the thermally conductive network. The sample obtained by the gel drying method has good thermal conductivity, and reflects that the filler has a positive effect on the formation of a three-dimensional heat conducting network.
It is seen from the rate of improvement of heat conduction that the thermal conductivity of the material obtained by orientation is greatly improved compared with the disordered filler mixing mode, and compared with the matrix material, the disordered filler heat conduction is respectively improved by 38.10% and 154.76%. Compared with a matrix material, the heat conduction of the material obtained by the method for orienting the filler is respectively improved by 229.76%, 352.98%, 1056.80% and 2868.88%.
The comparative examples and examples were tested for thermal conductivity (test standard GB/T1.1-2009) and the results are shown in Table 1.
TABLE 1
As can be seen from the table, the thermal conductivity of comparative examples 1 to 2 is significantly lower than that of examples 1 to 5, and the reason for this is that the mechanical force during the process of adding the filler and the additive by using the two-roll mill breaks the structural integrity of the three-dimensional thermal conductive network, so that the thermal conductivity of the graphene composite material is reduced. Meanwhile, the formula of the comparative example does not contain graphene oxide, so that a filler heat conduction path constructed in the graphene reduction process cannot be formed. In the embodiment, the formula contains graphene oxide, and a good heat-conducting network is formed in the reduction gelation process of the graphene oxide, and the extremely complete heat-conducting network structure can be kept in the drying process of the gel, so that good heat transfer is ensured, and more excellent heat-conducting performance is shown.
From the cross-comparison of the data of examples 1-5, it can be seen that the effects of different fillers on the final thermal conductivity are different, and the types of the fillers are greatly changed, so that the fillers should be selected in actual production according to the combination of the performance requirements of the final product and the amount of the fillers.
While the invention has been described in detail with reference to the foregoing examples, it is not intended to be limited to the details shown, since various equivalent modifications, such as changes in the formulation of ingredients with different activators, curatives, etc., and in the order of addition/processing/article-forming processing, can be made by those skilled in the art. Such equivalent modifications or substitutions are intended to be within the scope of the present application.
Claims (8)
1. The high-thermal-conductivity rubber nanocomposite is characterized by being prepared from the following raw materials:
the components are calculated according to the parts by weight,
100 parts by weight of rubber latex;
0.5-20 parts by weight of graphene oxide aqueous dispersion;
5-500 parts by weight of a nano heat-conducting filler;
1-40 parts of a reducing agent;
0.01-10 parts by weight of an emulsifier;
0.1-5 parts by weight of a vulcanizing agent;
the emulsifier is one or a combination of alkylphenol ethoxylates, fatty alcohol-polyoxyethylene ether, sorbitan fatty acid ester, peregal series emulsifier and coconut oil diethanolamide;
the concentration of the graphene oxide aqueous dispersion is 2mg/ml-10mg/ml, and the pH value is 8-12;
the preparation method of the high-thermal-conductivity rubber nanocomposite comprises the following steps:
uniformly mixing the graphene oxide aqueous dispersion and the nano filler, adding other components according to the using amount, and uniformly stirring; reducing to obtain hydrogel; and washing, drying and vulcanizing the hydrogel to obtain the high-thermal-conductivity rubber nanocomposite.
2. The highly thermally conductive rubber nanocomposite as claimed in claim 1, wherein:
the components are counted by weight part, and the weight percentage is,
100 parts by weight of rubber latex;
1-10 parts by weight of graphene oxide aqueous dispersion;
50-250 parts by weight of nano heat-conducting filler;
2-20 parts by weight of a reducing agent;
0.5-10 parts by weight of an emulsifier;
0.5-3 parts by weight of a vulcanizing agent.
3. The highly thermally conductive rubber nanocomposite material according to claim 1, wherein:
the rubber latex is one or a combination of natural latex, butadiene-styrene latex, butyronitrile latex, neoprene latex, cis-butadiene latex, epoxidized natural rubber latex, butadiene-pyrene latex, carboxyl butyronitrile latex, acrylic latex, silica gel latex and polyurethane latex.
4. The highly thermally conductive rubber nanocomposite material according to claim 1, wherein:
the nano heat-conducting filler is one or a combination of nano aluminum oxide, nano zinc oxide, nano diamond, nano silicon dioxide, nano carbon black, nano aluminum nitride, nano silicon carbide and nano carbon tube filler; the average grain diameter of the nanometer heat-conducting filler is between 5nm and 500 nm.
5. The highly thermally conductive rubber nanocomposite as claimed in claim 1, wherein:
the reducing agent is one or a combination of ascorbic acid, ethylenediamine and pyrrole.
6. A method for preparing the high thermal conductive rubber nanocomposite material as claimed in any one of claims 1 to 5, wherein the method comprises:
uniformly mixing the graphene oxide aqueous dispersion and the nano filler, adding other components according to the using amount, and uniformly stirring; reducing to obtain hydrogel; and washing, drying and vulcanizing the hydrogel to obtain the high-thermal-conductivity rubber nanocomposite.
7. The method for preparing a highly thermal conductive rubber nanocomposite as claimed in claim 6, wherein:
the reduction temperature is 70-98 ℃; the reduction time is 30min-12 h.
8. The method for preparing a highly thermally conductive rubber nanocomposite as claimed in claim 7, wherein the rubber nanocomposite is prepared by a known method
The reduction temperature is 70-95 ℃, and the reduction time is 30min-6 h.
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