CN114752163B - Graphene-nanometer lanthanum oxide-PTFE composite material and preparation method thereof - Google Patents
Graphene-nanometer lanthanum oxide-PTFE composite material and preparation method thereof Download PDFInfo
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Abstract
The application discloses a graphene-nanometer lanthanum oxide-PTFE composite material and a preparation method thereof, and relates to the field of PTFE materials. The graphene-nanometer lanthanum oxide-PTFE composite material comprises PTFE, a graphene-nanometer lanthanum oxide composite material and a silane coupling agent. The preparation method of the graphene-nanometer lanthanum oxide-PTFE composite material comprises the following steps: preparing a silane coupling agent modified graphene-nanometer lanthanum oxide composite material, and blending and extruding the PTFE and modified graphene-nanometer lanthanum oxide composite material to obtain the graphene-nanometer lanthanum oxide-PTFE composite material. The graphene-nanometer 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-nanometer 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-base resistance, solvent resistance, high-low temperature resistance and weather resistance. In addition, PTFE has a low coefficient of friction compared to other materials, which is beneficial to reducing the risk of scratching or scuffing the child playing toy when the child toy is made of PTFE material.
However, the bending strength of PTFE itself is about 20MPa, and it is not satisfactory for some toys or parts having high bending resistance.
In order to improve the bending strength of the PTFE material, the inventor tries to add or graphene into the PTFE material, but the inventor finds that the dispersibility of the graphene in the PTFE material is poor, so that the bending strength of the PTFE material is not improved well, and the friction coefficient of the PTFE material is increased.
Disclosure of Invention
The application provides a graphene-nanometer lanthanum oxide-PTFE composite material and a preparation method thereof in order to improve the bending strength of the PTFE material and reduce the influence of a reinforcing material on the friction coefficient of the PTFE material.
In a first aspect, the graphene-nanometer lanthanum oxide-PTFE composite material provided by the application adopts the following technical scheme:
the graphene-nanometer lanthanum oxide-PTFE composite material comprises the following raw materials in parts by weight:
PTFE:75-85 parts
Graphene-nano lanthanum oxide composite material: 8-12 parts
Silane coupling agent: 4-8 parts
The preparation method of the graphene-nanometer 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 nano lanthanum oxide-ethanol solution;
s1b, adding 5.5-9.5 parts by weight of dispersing agent into nano lanthanum oxide-ethanol solution, stirring uniformly to obtain dispersion liquid, adding 4-8 parts by weight of graphene into the dispersion liquid for multiple times, stirring at a stirring speed of 1000-2000r/min for 45-60min after adding graphene each time, carrying out ultrasonic treatment for 1-2h after adding graphene, preserving heat for 2-3h at a temperature of 80-90 ℃, cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
By adopting the technical scheme, the graphene-nanometer lanthanum oxide composite material prepared by the method has good dispersion performance 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.
Optionally, the dispersing agent is selected from one or a combination of more of polyvinyl alcohol and polyvinylpyrrolidone.
By adopting the technical scheme, the dispersion performance of the graphene in the nanometer lanthanum oxide-ethanol solution can be improved by adding the polyvinyl alcohol or the polyvinylpyrrolidone, so that the graphene is fully contacted with the nanometer lanthanum oxide-ethanol solution.
Optionally, the dispersing agent comprises polyvinyl alcohol and polyvinylpyrrolidone, wherein the weight ratio of the polyvinyl alcohol to the polyvinylpyrrolidone is (1-2): (3-4).
By adopting the technical scheme, the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone is (1-2): and (3-4) in the process of preparing the nano lanthanum oxide-ethanol solution, the dispersion performance of the graphene is optimal.
Optionally, in step S1b, the dispersion is further added with 4-6 parts by weight of a stabilizer.
By adopting the technical scheme, the stabilizer is added into the dispersion liquid, and after the graphene is uniformly dispersed in the nano lanthanum oxide-ethanol solution, the stabilizer 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 low molecular weight polyacrylamide and propylene glycol, wherein 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 nanometer 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 the stabilization of the low molecular weight polyacrylamide at high temperature.
Optionally, the molecular weight of the low molecular weight polyacrylamide ranges from 10 to 20 ten thousand.
By adopting the technical scheme, when the molecular weight range of the low molecular weight polyacrylamide is 10-20 ten thousand, the low molecular weight polyacrylamide can not influence the dispersion of graphene in the nanometer lanthanum oxide-ethanol solution, and can also stably disperse the graphene 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 the ethanol in the ethanol solution is more than or equal to 40%, the graphene is more beneficial to being dispersed in the dispersion liquid.
Optionally, the silane coupling agent is any one or a combination of a plurality of KH550 and KH 560.
By adopting the technical scheme, the dispersion performance of the graphene-nano lanthanum oxide composite material in the PTFE material can be further improved by KH550 and KH560, 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-nanometer lanthanum oxide composite material.
In a second aspect, the application provides a preparation method of a graphene-nanometer lanthanum oxide-PTFE composite material, which adopts the following technical scheme:
the preparation method of the graphene-nanometer lanthanum oxide-PTFE composite material comprises the following steps:
uniformly mixing a silane coupling agent with the graphene-nanometer lanthanum oxide composite material to obtain a modified graphene-nanometer lanthanum oxide composite material; and (3) blending and extruding the PTFE and the modified graphene-nanometer lanthanum oxide composite material to obtain the graphene-nanometer lanthanum oxide-PTFE composite material.
By adopting the technical scheme, the graphene-nanometer lanthanum oxide composite material is modified by adopting the silane coupling agent, so that the dispersion performance of the graphene-nanometer lanthanum oxide composite material in the PTFE material can be further improved, and the graphene-nanometer lanthanum oxide-PTFE composite material with lower friction coefficient and higher bending strength can be obtained.
In summary, the application at least comprises the following beneficial effects:
the graphene-nanometer lanthanum oxide-PTFE composite material prepared by the method has good dispersion performance in the PTFE material, can reduce the friction coefficient of the PTFE composite material, and can also 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
The preparation method of the graphene-nanometer lanthanum oxide-PTFE composite material comprises the following steps:
s1, preparing graphene-nanometer lanthanum oxide composite material
S1a, adding 20kg of nano lanthanum oxide into 1000kg of ethanol solution with the volume fraction of 40%, and uniformly mixing to obtain 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 at a stirring speed of 1000r/min for 45min; then adding 1kg of graphene, and stirring for 60min at a stirring speed of 2000 r/min; then adding the rest 1kg of graphene into the dispersion liquid twice, adding 0.5kg of graphene each time, and stirring at a stirring speed of 2000r/min for 60min after adding graphene each time; after the graphene is added, carrying out ultrasonic treatment for 1h, preserving heat at 80 ℃ for 3h, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nanometer lanthanum oxide composite material.
S2, preparing modified graphene-nanometer lanthanum oxide composite material
Uniformly mixing 4kg of silane coupling agent KH550 with 8kg of graphene-nanometer lanthanum oxide composite material to obtain modified graphene-nanometer lanthanum oxide composite material;
s3, preparing graphene-nanometer lanthanum oxide-PTFE composite material
And adding the modified graphene-nanometer lanthanum oxide composite material into 75kg of PTFE, and blending and extruding to obtain the graphene-nanometer lanthanum oxide-PTFE composite material.
Example 2
The preparation method of the graphene-nanometer lanthanum oxide-PTFE composite material comprises the following steps:
s1, preparing graphene-nanometer lanthanum oxide composite material
S1a, adding 30kg of nano lanthanum oxide into 1000kg of ethanol solution with the volume fraction of 60%, and uniformly mixing to obtain 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 at a stirring speed of 1000r/min for 45min; then adding 2kg of graphene, and stirring for 60min at a stirring speed of 2000 r/min; then adding the rest 3kg of graphene into the dispersion liquid twice, adding 1.5kg of graphene each time, and stirring at a stirring speed of 2000r/min for 60min after adding graphene each time; after the graphene is added, carrying out ultrasonic treatment for 2 hours, preserving heat at 90 ℃ for 2 hours, cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nanometer lanthanum oxide composite material.
S2, preparing modified graphene-nanometer lanthanum oxide composite material
Uniformly mixing 8kg of silane coupling agent KH550 and 12kg of graphene-nanometer lanthanum oxide composite material to obtain a modified graphene-nanometer lanthanum oxide composite material;
s3, preparing graphene-nanometer lanthanum oxide-PTFE composite material
And adding the modified graphene-nanometer lanthanum oxide composite material into 85kg of PTFE, and blending and extruding to obtain the graphene-nanometer lanthanum oxide-PTFE composite material.
Example 3
The graphene-nano lanthanum oxide-PTFE composite differs from example 1 in that:
5.5kg of polyvinyl alcohol are replaced by an equivalent amount of polyvinylpyrrolidone.
Example 4
The graphene-nano lanthanum oxide-PTFE composite differs from example 1 in that:
5.5kg of polyvinyl alcohol are replaced by 1.65kg of polyvinyl alcohol and 3.85kg of polyvinylpyrrolidone.
Example 5
The graphene-nano lanthanum oxide-PTFE composite differs from example 4 in that:
in step S1b, 0.8kg of low molecular polyacrylamide with a molecular weight of 15 ten thousand and 4.2kg of water are also added to the dispersion before the graphene is added.
Example 6
The graphene-nano lanthanum oxide-PTFE composite differs from example 4 in that:
in step S1b, 5kg of propylene glycol was also added to the dispersion prior to the addition of graphene.
Example 7
The graphene-nano lanthanum oxide-PTFE composite differs from example 4 in that:
in step S1b, 0.8kg of low molecular weight polyacrylamide with a molecular weight of 15 ten thousand and 4.2kg of propylene glycol are also added to the dispersion before the graphene is added.
Example 8
The graphene-nano lanthanum oxide-PTFE composite differs from example 4 in that:
in step S1b, 4.2kg of low molecular weight polyacrylamide with a molecular weight of 15 ten thousand and 0.8kg of propylene glycol are also added to the dispersion before the graphene is added.
Example 9
The graphene-nano lanthanum oxide-PTFE composite differs from example 7 in that:
in the step S1a, the volume fraction of ethanol in the ethanol solution is 30%.
Example 10
The graphene-nano lanthanum oxide-PTFE composite differs 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 preparation method of the graphene-PTFE composite material comprises 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 preparation method of the nano lanthanum oxide-PTFE composite material comprises 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 PTFE, and blending and extruding to obtain the nano lanthanum oxide-PTFE composite material.
Comparative example 3
The graphene-nano lanthanum oxide-PTFE composite differs from example 1 in that: the preparation methods of the graphene-nanometer lanthanum oxide composite material are different.
In this comparative example, the preparation method of the graphene-nano lanthanum oxide composite material is as follows:
uniformly mixing 20kg of nano lanthanum oxide with 4kg of graphene to prepare the graphene-nano lanthanum oxide-PTFE composite material.
Comparative example 4
The graphene-nano lanthanum oxide-PTFE composite differs from example 1 in that: the preparation methods of the graphene-nanometer 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 the volume fraction of 40%, and uniformly mixing to obtain 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 for 4 hours at a stirring speed of 2000 r/min; then carrying out ultrasonic treatment for 1h, then preserving heat at 80 ℃ for 3h, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nanometer lanthanum oxide composite material.
Comparative example 5
The graphene-nano lanthanum oxide-PTFE composite differs from example 1 in that: the preparation methods of the graphene-nanometer 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 the volume fraction of 40%, and uniformly mixing to obtain 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 at a stirring speed of 1000r/min for 45min; then adding 1kg of graphene, and stirring for 60min at a stirring speed of 2000 r/min; then adding the rest 1kg of graphene into the dispersion liquid twice, adding 0.5kg of graphene each time, and stirring at a stirring speed of 2000r/min for 60min after adding graphene each time; after the graphene is added, carrying out ultrasonic treatment for 1h, then standing for 3h at normal temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material.
Performance test data coefficient of friction: the detection is carried out with reference to GB/T10006-2021 determination of the coefficient of friction of Plastic films and sheets.
Flexural strength: the detection is carried out by referring to GB/T1449-2005 'method for testing bending Property of fiber reinforced plastics'.
TABLE 1 Performance data for PTFE composites in examples 1-10 and comparative examples 1-5
| Project | 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 |
| Project | 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 |
| Project | 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 example 1-2, comparative example 1-2 differs from example 1 in that: comparative example 1 uses graphene instead of the graphene-nano lanthanum oxide composite material in example 1, and comparative example 2 uses nano lanthanum oxide instead of the graphene-nano lanthanum oxide composite material in example 1. As can be seen from the data in table 1: although the graphene or nano lanthanum oxide can improve the bending strength of the PTFE material, the enhancement is not obvious, and meanwhile, the friction coefficient of the PTFE composite material is also increased. For this reason, the inventors speculate that the graphene modified with the silane coupling agent or the nano lanthanum oxide modified with the silane coupling agent has poor compatibility with the PTFE material and cannot be uniformly dispersed in the PTFE material, so that the bending strength of the PTFE composite material cannot be better improved, 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 comparative examples 3 to 5 is different from example 1. Wherein, the graphene-nanometer lanthanum oxide composite material in the comparative example 3 is directly prepared by uniformly mixing nanometer lanthanum oxide and graphene; compared with the embodiment 1, in the comparative example 4, when preparing the graphene-nano lanthanum oxide composite material, graphene adopts a one-step addition method; in contrast to example 1, comparative example 5 was not subjected to the temperature increasing treatment at the time of preparing the graphene-nano lanthanum oxide composite material. As can be seen from the data in table 1: the flexural strength of the PTFE composites in comparative examples 3-5 was reduced and the coefficient of friction was increased compared to example 1. For this reason, the inventors speculate that the graphene-nano lanthanum oxide composite material obtained by the method has better dispersion performance in the PTFE material and is 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. Wherein 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. As can be seen from the data in table 1: when the dispersing agent adopts a mixture of polyvinyl alcohol and polyvinylpyrrolidone, and the weight ratio of the polyvinyl alcohol to the polyvinylpyrrolidone is near 1.5:3.5, the friction coefficient of the PTFE composite material is more favorably reduced, and the bending strength of the PTFE composite material is improved. For this, the inventors hypothesize that the cause may be: when the dispersing agent adopts a mixture of polyvinyl alcohol and polyvinylpyrrolidone, the dispersing performance of the graphene in the nanometer lanthanum oxide-ethanol solution is better, so that the graphene is in full contact with the nanometer 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, stabilizers were also added to the dispersion. 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. As can be seen from the data in table 1, the use of the stabilizer alone, the use of propylene glycol alone, or the use of a mixture of low molecular weight polyacrylamide and propylene glycol in a weight ratio of 1:0.19 does not reduce the coefficient of friction of the PTFE composite well, and the use of the stabilizer alone, the use of the mixture of low molecular weight polyacrylamide and propylene glycol in a weight ratio of 0.19:1 does not reduce the coefficient of friction of the PTFE composite well. For this reason, the inventors speculate that the reason may be that the graphene dispersed in the dispersion liquid can be better stabilized when the low molecular weight polyacrylamide and the propylene glycol are compounded, so that the graphene is uniformly loaded with the nano lanthanum oxide, 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 increases when the volume fraction of the ethanol solution becomes 30%, and the friction coefficient of the PTFE composite increases when the volume fraction of the ethanol solution becomes 75%. In this regard, the inventors speculate that the reason may be that the volume fraction of the ethanol solution may also affect the dispersion performance of graphene in the nano lanthanum oxide-ethanol solution, wherein when the volume fraction of the ethanol solution is greater than or equal to 40%, the dispersion of graphene is more favored.
Claims (9)
1. The graphene-nanometer lanthanum oxide-PTFE composite material is characterized by comprising the following raw materials in parts by weight:
PTFE:75-85 parts
Graphene-nano lanthanum oxide composite material: 8-12 parts
Silane coupling agent: 4-8 parts
The preparation method of the graphene-nanometer 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 nano lanthanum oxide-ethanol solution;
s1b, adding 5.5-9.5 parts by weight of 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 at a stirring speed of 1000-2000r/min for 45-60min after each time of adding graphene, carrying out ultrasonic treatment for 1-2h after the graphene is added, preserving heat for 2-3h at a temperature of 80-90 ℃, then cooling to room temperature, separating out a solid product, and drying the solid product to obtain the graphene-nano lanthanum oxide composite material;
the dispersing agent is selected from one or a combination of more of polyvinyl alcohol and polyvinylpyrrolidone.
2. The graphene-nano lanthanum oxide-PTFE composite according to 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).
3. The graphene-nano lanthanum oxide-PTFE composite according to claim 1, wherein: in the step S1b, 4-6 parts by weight of stabilizer is also added to the dispersion.
4. A graphene-nano lanthanum oxide-PTFE composite according to claim 3, characterized in that: the stabilizer comprises low molecular weight polyacrylamide and propylene glycol, wherein the weight ratio of the low molecular weight polyacrylamide to the propylene glycol is (0.1-0.3): 1.
5. the graphene-nano lanthanum oxide-PTFE composite according to claim 4, wherein: the molecular weight of the low molecular weight polyacrylamide is 10-20 ten thousand.
6. The graphene-nano lanthanum oxide-PTFE composite according to claim 1, wherein: the volume fraction of ethanol in the ethanol solution is more than or equal to 40 percent.
7. The graphene-nano lanthanum oxide-PTFE composite according to claim 1, wherein: the silane coupling agent is selected from one or a combination of a plurality of KH550 and KH 560.
8. The graphene-nano lanthanum oxide-PTFE composite according to any one of claims 1-7, wherein: the graphene-nanometer lanthanum oxide-PTFE composite material further comprises 1-3 parts by weight of silicone powder.
9. A method for preparing a graphene-nano lanthanum oxide-PTFE composite according to any one of claims 1 to 7, comprising the steps of:
uniformly mixing a silane coupling agent with the graphene-nanometer lanthanum oxide composite material to obtain a modified graphene-nanometer lanthanum oxide composite material;
and (3) blending and extruding the PTFE and the modified graphene-nanometer lanthanum oxide composite material to obtain the graphene-nanometer lanthanum oxide-PTFE composite material.
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