CN114752163A - Graphene-nano lanthanum oxide-PTFE composite material and preparation method thereof - Google Patents
Graphene-nano lanthanum oxide-PTFE composite material and preparation method thereof Download PDFInfo
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Abstract
The application discloses a graphene-nano lanthanum oxide-PTFE composite material and a preparation method thereof, and relates to the field of PTFE materials. The graphene-nano lanthanum oxide-PTFE composite material comprises PTFE, a graphene-nano lanthanum oxide composite material and a silane coupling agent. The preparation method of the graphene-nano lanthanum oxide-PTFE composite material comprises the following steps: preparing a silane coupling agent modified graphene-nano lanthanum oxide composite material, and blending and extruding PTFE and the modified graphene-nano lanthanum oxide composite material to obtain the graphene-nano lanthanum oxide-PTFE composite material. The graphene-nano lanthanum oxide-PTFE composite material has the advantages of low friction coefficient and high bending strength.
Description
Technical Field
The application relates to the field of polytetrafluoroethylene composite materials, in particular to a graphene-nano lanthanum oxide-PTFE composite material and a preparation method thereof.
Background
Polytetrafluoroethylene (PTFE) is widely applied in various fields as a special engineering plastic, and has the characteristics of good acid and alkali resistance, solvent resistance, high and low temperature resistance and weather resistance. In addition, the friction coefficient of PTFE is very low compared with other materials, and when the PTFE material is used for manufacturing children toys, the risk that children are scratched or bruised when playing the toys is favorably reduced.
However, the bending strength of PTFE itself is about 20MPa, and thus cannot meet the requirements of some toys and parts which have high requirements for bending resistance.
In order to improve the bending strength of the PTFE material, the inventors tried to add graphene into the PTFE material, but the inventors found that the graphene has a poor dispersibility in the PTFE material, and not only did not improve the bending strength of the PTFE material well, but also increased the friction coefficient of the PTFE material.
Disclosure of Invention
In order to improve the bending strength of a PTFE material and reduce the influence of a reinforcing material on the friction coefficient of the PTFE material, the application provides a graphene-nano lanthanum oxide-PTFE composite material and a preparation method thereof.
In a first aspect, the graphene-nano lanthanum oxide-PTFE composite material provided by the application adopts the following technical scheme:
the graphene-nano lanthanum oxide-PTFE composite material comprises the following raw materials in parts by weight:
PTFE: 75-85 parts of
Graphene-nano lanthanum oxide composite material: 8 to 12 portions of
Silane coupling agent: 4 to 8 portions of
The preparation method of the graphene-nano lanthanum oxide composite material comprises the following steps:
s1a, adding 20-30 parts by weight of nano lanthanum oxide into 1000 parts by weight of ethanol solution, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 5.5-9.5 parts by weight of a dispersing agent into a nano lanthanum oxide-ethanol solution, uniformly stirring to obtain a dispersion liquid, adding 4-8 parts by weight of graphene into the dispersion liquid for multiple times, stirring for 45-60min at a stirring speed of 1000-2000r/min after each time of adding the graphene, carrying out ultrasonic treatment for 1-2h after finishing adding the graphene, carrying out heat preservation for 2-3h at the temperature of 80-90 ℃, then cooling to room temperature, separating a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
By adopting the technical scheme, the graphene-nano lanthanum oxide composite material prepared by the method has good dispersibility in the PTFE material, the friction coefficient of the PTFE composite material can be reduced, and the bending strength of the PTFE composite material can be improved.
Optionally, the dispersant is any one or a combination of polyvinyl alcohol and polyvinylpyrrolidone.
By adopting the technical scheme, the addition of the polyvinyl alcohol or the polyvinylpyrrolidone can improve the dispersion performance of the graphene in the nano lanthanum oxide-ethanol solution, so that the graphene is fully contacted with the nano lanthanum oxide-ethanol solution.
Optionally, the dispersant comprises polyvinyl alcohol and polyvinylpyrrolidone, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone is (1-2): (3-4).
By adopting the technical scheme, the weight ratio of the polyvinyl alcohol to the polyvinylpyrrolidone is (1-2): and (3-4), the dispersion performance of the graphene in the nano lanthanum oxide-ethanol solution is optimal.
Optionally, in the step S1b, 4 to 6 parts by weight of a stabilizer is further added to the dispersion.
By adopting the technical scheme, the stabilizing agent is added into the dispersion liquid, and after the graphene is uniformly dispersed in the nano lanthanum oxide-ethanol solution, the stabilizing agent can prolong the stable dispersion time of the graphene in the nano lanthanum oxide-ethanol solution, and the graphene is fully contacted with the nano lanthanum oxide-ethanol solution.
Optionally, the stabilizer comprises a low molecular weight polyacrylamide and propylene glycol, and the weight ratio of the low molecular weight polyacrylamide to the propylene glycol is (0.1-0.3): 1.
by adopting the technical scheme, the stabilizer is low-molecular-weight polyacrylamide, wherein the low-molecular-weight polyacrylamide can increase the viscosity of the dispersion liquid, so that the graphene dispersed in the nano lanthanum oxide-ethanol solution is stabilized; the propylene glycol can improve the viscosity stability of the low molecular weight polyacrylamide at high temperature, and is beneficial to ensuring that the low molecular weight polyacrylamide can also play a stabilizing role at high temperature.
Optionally, the molecular weight of the low molecular weight polyacrylamide is in the range of 10-20 ten thousand.
By adopting the technical scheme, when the molecular weight of the low-molecular-weight polyacrylamide is within the range of 10-20 ten thousand, the low-molecular-weight polyacrylamide does not influence the dispersion of the graphene in the nano lanthanum oxide-ethanol solution, and simultaneously can stabilize the graphene dispersed in the dispersion liquid.
Optionally, the volume fraction of ethanol in the ethanol solution is more than or equal to 40%.
By adopting the technical scheme, when the volume fraction of ethanol in the ethanol solution is more than or equal to 40%, the graphene can be dispersed in the dispersion liquid more favorably.
Optionally, the silane coupling agent is selected from any one or a combination of KH550 and KH 560.
By adopting the technical scheme, both KH550 and KH560 can further improve the dispersion performance of the graphene-nano lanthanum oxide composite material in the PTFE material, so that the friction coefficient of the graphene-nano lanthanum oxide-PTFE composite material is further reduced.
Optionally, the graphene-nano lanthanum oxide-PTFE composite material further comprises 1-3 parts by weight of silicone powder.
By adopting the technical scheme, the silicone powder can improve the fluidity of the PTFE material and promote the uniform mixing of the PTFE material and the graphene-nano lanthanum oxide composite material.
In a second aspect, the application provides a preparation method of a graphene-nano lanthanum oxide-PTFE composite material, which adopts the following technical scheme:
a preparation method of a graphene-nano lanthanum oxide-PTFE composite material comprises the following steps:
uniformly mixing a silane coupling agent and the graphene-nano lanthanum oxide composite material to obtain a modified graphene-nano lanthanum oxide composite material; and blending and extruding the PTFE and the modified graphene-nano lanthanum oxide composite material to obtain the graphene-nano lanthanum oxide-PTFE composite material.
By adopting the technical scheme, the graphene-nano lanthanum oxide composite material is modified by adopting the silane coupling agent, so that the dispersion performance of the graphene-nano lanthanum oxide composite material in the PTFE material can be further improved, and the graphene-nano lanthanum oxide-PTFE composite material with a low friction coefficient and high bending strength can be obtained.
In summary, the present application at least includes the following beneficial effects:
the graphene-nano lanthanum oxide-PTFE composite material prepared by the method has good dispersibility in the PTFE material, can reduce the friction coefficient of the PTFE composite material, and can improve the bending strength of the PTFE composite material.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Examples
Example 1
A preparation method of the graphene-nano lanthanum oxide-PTFE composite material comprises the following steps:
s1, preparing graphene-nano lanthanum oxide composite material
S1a, adding 20kg of nano lanthanum oxide into 1000kg of ethanol solution with volume fraction of 40%, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 5.5kg of polyvinyl alcohol into the nano lanthanum oxide-ethanol solution, and uniformly stirring to obtain a dispersion liquid; adding 2kg of graphene into the dispersion liquid, and stirring for 45min at a stirring speed of 1000 r/min; then adding 1kg of graphene, and stirring at a stirring speed of 2000r/min for 60 min; then adding the rest 1kg of graphene into the dispersion liquid twice, wherein 0.5kg of graphene is added each time, and stirring for 60min at the stirring speed of 2000r/min after each time of adding the graphene; and after finishing adding the graphene, carrying out ultrasonic treatment for 1h, carrying out heat preservation for 3h at the temperature of 80 ℃, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
S2, preparing modified graphene-nano lanthanum oxide composite material
Uniformly mixing 4kg of silane coupling agent KH550 and 8kg of graphene-nano lanthanum oxide composite material to obtain a modified graphene-nano lanthanum oxide composite material;
s3, preparing graphene-nano lanthanum oxide-PTFE composite material
Adding the modified graphene-nano lanthanum oxide composite material into 75kg of PTFE, and blending and extruding to obtain the graphene-nano lanthanum oxide-PTFE composite material.
Example 2
A preparation method of the graphene-nano lanthanum oxide-PTFE composite material comprises the following steps:
s1, preparing graphene-nano lanthanum oxide composite material
S1a, adding 30kg of nano lanthanum oxide into 1000kg of ethanol solution with volume fraction of 60%, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 9.5kg of polyvinyl alcohol into the nano lanthanum oxide-ethanol solution, and uniformly stirring to obtain a dispersion liquid; adding 3kg of graphene into the dispersion liquid, and stirring for 45min at a stirring speed of 1000 r/min; then adding 2kg of graphene, and stirring at a stirring speed of 2000r/min for 60 min; then adding the rest 3kg of graphene into the dispersion liquid twice, wherein 1.5kg of graphene is added each time, and stirring for 60min at the stirring speed of 2000r/min after each time of adding the graphene; and after the graphene is added, carrying out ultrasonic treatment for 2h, carrying out heat preservation at the temperature of 90 ℃ for 2h, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
S2, preparing modified graphene-nano lanthanum oxide composite material
Uniformly mixing 8kg of silane coupling agent KH550 and 12kg of graphene-nano lanthanum oxide composite material to obtain a modified graphene-nano lanthanum oxide composite material;
s3, preparing graphene-nano lanthanum oxide-PTFE composite material
Adding the modified graphene-nano lanthanum oxide composite material into 85kg of PTFE, and blending and extruding to obtain the graphene-nano lanthanum oxide-PTFE composite material.
Example 3
A graphene-nano lanthanum oxide-PTFE composite material, which differs from example 1 in that:
5.5kg of polyvinyl alcohol were replaced by an equivalent amount of polyvinylpyrrolidone.
Example 4
A graphene-nano lanthanum oxide-PTFE composite, which differs from example 1 in that:
5.5kg of polyvinyl alcohol were replaced by 1.65kg of polyvinyl alcohol and 3.85kg of polyvinylpyrrolidone.
Example 5
A graphene-nano lanthanum oxide-PTFE composite, differing from example 4 in that:
in the step S1b, 0.8kg of low molecular weight polyacrylamide with a molecular weight of 15 ten thousand and 4.2kg of water are added to the dispersion before adding graphene.
Example 6
A graphene-nano lanthanum oxide-PTFE composite, differing from example 4 in that:
in the step S1b, 5kg of propylene glycol was added to the dispersion before adding the graphene.
Example 7
A graphene-nano lanthanum oxide-PTFE composite, differing from example 4 in that:
in the step S1b, 0.8kg of low molecular weight polyacrylamide with a molecular weight of 15 ten thousand and 4.2kg of propylene glycol were added to the dispersion before adding graphene.
Example 8
A graphene-nano lanthanum oxide-PTFE composite, differing from example 4 in that:
in the step S1b, 4.2kg of low molecular weight polyacrylamide with a molecular weight of 15 ten thousand and 0.8kg of propylene glycol were added to the dispersion before adding graphene.
Example 9
A graphene-nano lanthanum oxide-PTFE composite, differing from example 7 in that:
in the step S1a, the volume fraction of ethanol in the ethanol solution is 30%.
Example 10
A graphene-nano lanthanum oxide-PTFE composite, differing from example 7 in that:
in the step S1a, the volume fraction of ethanol in the ethanol solution is 75%.
Comparative example
Comparative example 1
A graphene-PTFE composite material is prepared by the following steps:
uniformly mixing 4kg of silane coupling agent KH550 and 8kg of graphene to obtain a modified graphene material;
and adding the modified graphene material into 75kg of PTFE, and blending and extruding to obtain the graphene-PTFE composite material.
Comparative example 2
A nanometer lanthanum oxide-PTFE composite material is prepared by the following steps:
uniformly mixing 4kg of silane coupling agent KH550 and 8kg of nano lanthanum oxide to obtain a modified nano lanthanum oxide material;
and adding the modified nano lanthanum oxide material into 75kg of PTFE, and blending and extruding to obtain the nano lanthanum oxide-PTFE composite material.
Comparative example 3
A graphene-nano lanthanum oxide-PTFE composite material, which differs from example 1 in that: the preparation methods of the graphene-nano lanthanum oxide composite material are different.
In this comparative example, the preparation method of the graphene-nano lanthanum oxide composite material is as follows:
and uniformly mixing 20kg of nano lanthanum oxide and 4kg of graphene to obtain the graphene-nano lanthanum oxide-PTFE composite material.
Comparative example 4
A graphene-nano lanthanum oxide-PTFE composite material, which differs from example 1 in that: the preparation methods of the graphene-nano lanthanum oxide composite material are different.
In this comparative example, the preparation method of the graphene-nano lanthanum oxide composite material is as follows:
s1a, adding 20kg of nano lanthanum oxide into 1000kg of ethanol solution with volume fraction of 40%, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 5.5kg of polyvinyl alcohol into the nano lanthanum oxide-ethanol solution, and uniformly stirring to obtain a dispersion liquid; adding 4kg of graphene into the dispersion liquid, and stirring at a stirring speed of 2000r/min for 4 hours; and then carrying out ultrasonic treatment for 1h, then carrying out heat preservation at the temperature of 80 ℃ for 3h, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
Comparative example 5
A graphene-nano lanthanum oxide-PTFE composite, which differs from example 1 in that: the preparation methods of the graphene-nano lanthanum oxide composite material are different.
In this comparative example, the preparation method of the graphene-nano lanthanum oxide composite material is as follows:
s1a, adding 20kg of nano lanthanum oxide into 1000kg of ethanol solution with volume fraction of 40%, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 5.5kg of polyvinyl alcohol into the nano lanthanum oxide-ethanol solution, and uniformly stirring to obtain a dispersion liquid; adding 2kg of graphene into the dispersion liquid, and stirring for 45min at a stirring speed of 1000 r/min; then adding 1kg of graphene, and stirring at a stirring speed of 2000r/min for 60 min; then adding the remaining 1kg of graphene into the dispersion liquid twice, wherein 0.5kg of graphene is added each time, and stirring for 60min at a stirring speed of 2000r/min after each addition of the graphene; and after the graphene is added, carrying out ultrasonic treatment for 1h, then standing at normal temperature for 3h, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
Performance test data friction coefficient: the test was carried out with reference to GB/T10006-2021 measurement of Friction coefficient of Plastic film and sheet.
Bending strength: the test is carried out according to GB/T1449-.
TABLE 1 Performance data for PTFE composites of examples 1-10 and comparative examples 1-5
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Coefficient of friction | 0.154 | 0.165 | 0.161 | 0.124 | 0.115 |
| Flexural strength/MPa | 34 | 38 | 32 | 37 | 38 |
| Item | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 |
| Coefficient of friction | 0.120 | 0.084 | 0.144 | 0.101 | 0.072 |
| Flexural strength/MPa | 37 | 40 | 35 | 38 | 40 |
| Item | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Coefficient of friction | 0.334 | 0.319 | 0.328 | 0.307 | 0.322 |
| Flexural strength/MPa | 25 | 23 | 27 | 24 | 26 |
Comparative example 1 and comparative examples 1-2, and comparative examples 1-2 differ from example 1 in that: comparative example 1 used graphene instead of the graphene-nano lanthanum oxide composite material of example 1, and comparative example 2 used nano lanthanum oxide instead of the graphene-nano lanthanum oxide composite material of example 1. In combination with the data in table 1: the graphene or nano lanthanum oxide can improve the bending strength of the PTFE material, but the enhancement is not obvious, and meanwhile, the friction coefficient of the PTFE composite material is also increased. In contrast, the inventors speculate that the reason for this may be that the compatibility between the graphene modified by the silane coupling agent or the nano lanthanum oxide modified by the silane coupling agent and the PTFE material is poor, and the graphene or the nano lanthanum oxide modified by the silane coupling agent cannot be uniformly dispersed in the PTFE material, so that the bending strength of the PTFE composite material cannot be improved well, the surface roughness of the PTFE composite material is increased, and the friction coefficient is increased.
Comparative example 1 and comparative examples 3 to 5, comparative examples 3 to 5 differ from example 1 in that: the preparation method of the graphene-nano lanthanum oxide composite material in the comparative examples 3 to 5 is different from that in the example 1. The graphene-nano lanthanum oxide composite material in the comparative example 3 is prepared by directly and uniformly mixing nano lanthanum oxide and graphene; compared with the embodiment 1, in the comparative example 4, when the graphene-nano lanthanum oxide composite material is prepared, the graphene adopts a one-step addition method; compared with example 1, comparative example 5 does not perform temperature-raising treatment when preparing the graphene-nano lanthanum oxide composite material. In combination with the data in table 1, it can be seen that: the bending strength of the PTFE composites of comparative examples 3-5 was reduced, while the coefficient of friction was increased, compared to example 1. In this regard, the inventors speculate that the reason may be that when the method in the present application is used to prepare the graphene-nano lanthanum oxide composite material, the obtained graphene-nano lanthanum oxide composite material has a good dispersibility in the PTFE material, and is also beneficial to improving the bending strength of the PTFE material.
Comparative example 1 and examples 3-4, examples 3-4 differ from example 1 in the choice of dispersant. The dispersing agent in the embodiment 1 is polyvinyl alcohol, the dispersing agent in the embodiment 3 is polyvinylpyrrolidone, the dispersing agent in the embodiment 4 is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the weight ratio of the polyvinyl alcohol to the polyvinylpyrrolidone is 1.5: 3.5. In combination with the data in table 1, it can be seen that: when the dispersing agent is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone is about 1.5:3.5, the friction coefficient of the PTFE composite material is reduced, and the bending strength of the PTFE composite material is improved. The inventors guessed that the reason for this could be: when the dispersing agent is a mixture of polyvinyl alcohol and polyvinylpyrrolidone, the dispersion performance of graphene in the nano lanthanum oxide-ethanol solution is better, so that the graphene can be in full contact with the nano lanthanum oxide-ethanol solution.
Comparative example 4 and examples 5-8, examples 5-8 differ from example 4 in that: in examples 5 to 8, a stabilizer was also added to the dispersion. Wherein the stabilizer in example 5 is a mixture of low molecular weight polyacrylamide and water, the stabilizer in example 6 is propylene glycol, the stabilizer in example 7 is a mixture of low molecular weight polyacrylamide and propylene glycol in a weight ratio of 0.19:1, and the stabilizer in example 8 is a mixture of low molecular weight polyacrylamide and propylene glycol in a weight ratio of 1: 0.19. It can be seen from the data in table 1 that the friction coefficient of the PTFE composite could not be reduced well when the stabilizer was low molecular weight polyacrylamide alone, propylene glycol alone, or a mixture of low molecular weight polyacrylamide and propylene glycol at a weight ratio of 1:0.19, and the friction coefficient of the PTFE composite could only be reduced effectively when the stabilizer was a mixture of low molecular weight polyacrylamide and propylene glycol at a weight ratio of 0.19: 1. In this regard, the inventor speculates that the reason may be that graphene dispersed in the dispersion liquid can be better stabilized only when the low molecular weight polyacrylamide and the propylene glycol are compounded, so that the nano lanthanum oxide is uniformly loaded on the graphene, which is beneficial to further promoting the dispersion performance of the graphene-nano lanthanum oxide composite material in the PTFE material, thereby reducing the friction coefficient of the PTFE composite material.
Comparing example 7 with examples 9-10, the volume fraction of ethanol in the ethanol solution of example 7 was 40%, the volume fraction of ethanol in the ethanol solution of example 9 was 30%, and the volume fraction of ethanol in the ethanol solution of example 10 was 75%. As can be seen from the data in table 1, the friction coefficient of the PTFE composite increased when the volume fraction of the ethanol solution became 30%, and the friction coefficient of the PTFE composite increased when the volume fraction of the ethanol solution became 75%. In this regard, the inventors speculate that the volume fraction of the ethanol solution may also affect the dispersion performance of the graphene in the nano lanthanum oxide-ethanol solution, wherein the volume fraction of the ethanol solution is greater than or equal to 40% to facilitate the dispersion of the graphene.
Claims (10)
1. The graphene-nano lanthanum oxide-PTFE composite material is characterized by comprising the following raw materials in parts by weight:
PTFE: 75-85 parts of
Graphene-nano lanthanum oxide composite material: 8 to 12 portions of
Silane coupling agent: 4 to 8 portions of
The preparation method of the graphene-nano lanthanum oxide composite material comprises the following steps:
s1a, adding 20-30 parts by weight of nano lanthanum oxide into 1000 parts by weight of ethanol solution, and uniformly mixing to obtain a nano lanthanum oxide-ethanol solution;
s1b, adding 5.5-9.5 parts by weight of a dispersing agent into a nano lanthanum oxide-ethanol solution, uniformly stirring to obtain a dispersion liquid, adding 4-8 parts by weight of graphene into the dispersion liquid for multiple times, stirring for 45-60min at a stirring speed of 1000-2000r/min after each time of adding the graphene, carrying out ultrasonic treatment for 1-2h after finishing adding the graphene, carrying out heat preservation for 2-3h at the temperature of 80-90 ℃, then cooling to room temperature, separating a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
2. The graphene-nano lanthanum oxide-PTFE composite material of claim 1, wherein: the dispersant is any one or a combination of polyvinyl alcohol and polyvinylpyrrolidone.
3. The graphene-nano lanthanum oxide-PTFE composite material of claim 1, wherein: the dispersing agent comprises polyvinyl alcohol and polyvinylpyrrolidone, wherein the weight ratio of the polyvinyl alcohol to the polyvinylpyrrolidone is (1-2): (3-4).
4. The graphene-nano lanthanum oxide-PTFE composite material of claim 1, wherein: in the step S1b, 4-6 parts by weight of a stabilizer is further added to the dispersion liquid.
5. The graphene-nano lanthanum oxide-PTFE composite material of claim 4, wherein: the stabilizer comprises low molecular weight polyacrylamide and propylene glycol, and the weight ratio of the low molecular weight polyacrylamide to the propylene glycol is (0.1-0.3): 1.
6. the graphene-nano lanthanum oxide-PTFE composite material of claim 5, wherein: the molecular weight range of the low molecular weight polyacrylamide is 10-20 ten thousand.
7. The graphene-nano lanthanum oxide-PTFE composite material of any one of claims 1, wherein: the volume fraction of ethanol in the ethanol solution is more than or equal to 40 percent.
8. The graphene-nano lanthanum oxide-PTFE composite material of claim 1, wherein: the silane coupling agent is selected from any one or a combination of KH550 and KH 560.
9. The graphene-nano lanthanum oxide-PTFE composite according to any one of claims 1 to 8, wherein: the graphene-nano lanthanum oxide-PTFE composite material also comprises 1-3 parts by weight of silicone powder.
10. The preparation method of the graphene-nano lanthanum oxide-PTFE composite material as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
uniformly mixing a silane coupling agent and the graphene-nano lanthanum oxide composite material to obtain a modified graphene-nano lanthanum oxide composite material;
and blending and extruding the PTFE and the modified graphene-nano lanthanum oxide composite material to obtain the graphene-nano lanthanum oxide-PTFE composite material.
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