CN114539692A - Carbon nanohorn modified polytetrafluoroethylene, preparation method thereof and sealing element - Google Patents
Carbon nanohorn modified polytetrafluoroethylene, preparation method thereof and sealing element Download PDFInfo
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Abstract
The invention relates to the field of polytetrafluoroethylene modification, in particular to carbon nanohorn modified polytetrafluoroethylene, a preparation method thereof and a sealing element. The carbon nanohorn modified polytetrafluoroethylene comprises polytetrafluoroethylene and carbon nanohorns dispersed in the polytetrafluoroethylene, wherein the mass percentage of the carbon nanohorns is 3-10%. The carbon nanohorns with the characteristic of multiple dimensions are selected as the fillers, so that the modification effect of various composite fillers is achieved, the tribological performance of the modified PTFE is improved, and the wear rate and the friction coefficient of the modified PTFE material can be reduced.
Description
Technical Field
The invention relates to the field of polytetrafluoroethylene modification, in particular to carbon nanohorn modified polytetrafluoroethylene, a preparation method thereof and a sealing element.
Background
Polytetrafluoroethylene (PTFE) as a special engineering plastic is widely applied in various fields, and has good acid and alkali resistance, high and low temperature resistance and weather resistance. Most importantly, PTFE has a low coefficient of friction compared to other materials, is a self-lubricating material with excellent properties, and can be used as a good sealing material. But PTFE has poor wear resistance, easy loss and short service life, which greatly restrictsIt is more widely used. At present, three tribology modification modes for PTFE are mainly adopted, namely filling modification, blending modification and surface modification, wherein the filling modification is the most common modification mode due to low modification cost and relatively mature technology. However, the modification effect of the traditional fillers such as bronze powder, carbon fiber, glass fiber and graphite cannot reduce the friction coefficient and the wear rate at the same time, the purpose of improving the performance of the other side is often achieved by losing one side of the friction coefficient and the wear rate, and the mechanical property of the modified PTFE is generally reduced. And graphene and nano Al2O3Nano SiO2The problems of uneven dispersion and easy agglomeration of the novel nano-filler in a PTFE matrix generally exist, the preparation method of most of the nano-fillers is complex and high in cost, and the modification effect is not superior to that of the traditional filler.
Disclosure of Invention
Based on the carbon nanohorn modified polytetrafluoroethylene, the preparation method thereof and the sealing element are provided, wherein the carbon nanohorn modified polytetrafluoroethylene can simultaneously reduce the friction coefficient and the wear rate.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention relates to carbon nanohorn modified polytetrafluoroethylene, which comprises polytetrafluoroethylene and carbon nanohorns dispersed in the polytetrafluoroethylene, wherein the mass percentage of the carbon nanohorns in the carbon nanohorn modified polytetrafluoroethylene is 3-10%.
Optionally, the carbon nanohorn-modified polytetrafluoroethylene is such that the mass percentage of the carbon nanohorn in the carbon nanohorn-modified polytetrafluoroethylene is 3% to 8%.
Optionally, the carbon nanohorn-modified polytetrafluoroethylene as described above, wherein the particle size of the carbon nanohorn is 20nm to 400 nm.
Optionally, the carbon nanohorn-modified polytetrafluoroethylene has an average particle size of 2 μm to 10 μm.
The invention also provides a preparation method of the carbon nanohorn modified polytetrafluoroethylene, which comprises the steps of pressing and sintering the mixed powder of the polytetrafluoroethylene and the carbon nanohorn.
Optionally, in the above method for preparing carbon nanohorn-modified polytetrafluoroethylene, the polytetrafluoroethylene powder is dried at 23 to 25 ℃ in advance before the mixed powder is formed.
Optionally, in the preparation method of the carbon nanohorn-modified polytetrafluoroethylene, the pressing method is cold pressing, and the pressure of the cold pressing is 27MPa to 37 MPa.
Optionally, in the preparation method of the carbon nanohorn-modified polytetrafluoroethylene, the sintering temperature is 380 to 385 ℃.
The invention also relates to a sealing element which comprises the carbon nanohorn modified polytetrafluoroethylene.
Optionally, as for the sealing element described above, the sealing element is an O-ring or a profile sealing element.
The research of the invention finds that the basic reason of poor wear resistance of the polytetrafluoroethylene material is that the molecular chain is linear and has no branched chain, which leads the polytetrafluoroethylene material to be easily peeled in a large area under the action of shearing force during opposite grinding. Carbon Nanohorns (CNHs) are formed by self-assembly of thousands of single-walled conical carbon tubes, and the carbon tubes can play a role in stably fixing a PTFE macromolecular chain which is easy to slide, so that the sliding of molecular chains of the PTFE macromolecular chain is limited. And the tip of the carbon nanohorn conical carbon tube has a cap brim structure, and a fullerene-like curved surface structure is distributed on the tip of the cap brim structure, so that the modified PTFE material which is ground down in the process of abrasion is easier to adhere to the surface of an abrasive to form a transfer film, thereby playing a role in abrasion resistance. In addition, the carbon nanohorn core part is composed of short-range disordered graphene sheet layers, has an ultra-large specific surface area, and can stably adsorb and coat PTFE molecular chains, so that the pulling-out of the grinding material to the PTFE molecular chains is slowed down during grinding, and a good wear-resisting effect is achieved. In conclusion, the carbon nanohorns with the characteristic of multiple dimensions are selected as the fillers, so that the modification effect of various composite fillers is achieved, the tribological performance of the modified PTFE is improved, and the wear rate and the friction coefficient of the modified PTFE material can be reduced.
Detailed Description
Reference will now be made in detail to embodiments of the invention, one or more examples of which are described below. Each example is provided by way of explanation, not limitation, of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used on another embodiment to yield a still further embodiment.
It is therefore intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present invention are disclosed in or are apparent from the following detailed description. It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Other than as shown in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients, physical and chemical properties, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". For example, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be suitably varied by those skilled in the art in seeking to obtain the desired properties utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, and the like.
The invention relates to carbon nanohorn modified polytetrafluoroethylene, which comprises polytetrafluoroethylene and carbon nanohorns dispersed in the polytetrafluoroethylene, wherein the mass percentage of the carbon nanohorns is 3-10%.
Research shows that the basic reason for poor wear resistance of polytetrafluoroethylene materials is that the molecular chain is linear and has no branched chain, which leads to the fact that the polytetrafluoroethylene materials are easy to be peeled off in a large area under the action of shearing force during opposite grinding.
Carbon Nanohorns (CNHs) are formed by self-assembly of thousands of single-walled conical carbon tubes, and the carbon tubes can play a role in stably fixing a PTFE macromolecular chain which is easy to slide, so that the sliding of molecular chains of the PTFE macromolecular chain is limited. And the tip of the carbon nanohorn conical carbon tube has a cap brim structure, and a fullerene-like curved surface structure is distributed on the tip of the cap brim structure, so that the modified PTFE material which is ground down in the process of abrasion is easier to adhere to the surface of an abrasive to form a transfer film, thereby playing a role in abrasion resistance. In addition, the carbon nanohorn core part is composed of short-range disordered graphene sheet layers, has an ultra-large specific surface area, and can stably adsorb and coat PTFE molecular chains, so that the pulling-out of the grinding material to the PTFE molecular chains is slowed down during grinding, and a good wear-resisting effect is achieved.
In conclusion, the carbon nanohorns with the characteristics of multiple dimensions (zero dimension, one dimension and two dimensions) are selected as the fillers, so that the modification effect of various composite fillers is achieved, the tribological performance of the modified PTFE is improved, and the wear rate and the friction coefficient of the modified PTFE material can be reduced at the same time.
In some embodiments, the mass percentage content of the carbon nanohorns may also be 3.5%, 4%, 5%, 5.2%, 5.8%, 6%, 7%, 8%, 9%, etc. Preferably, the carbon nanohorn is present in an amount of 3 to 8% by mass. More preferably, the carbon nanohorn is contained in an amount of 5% by mass.
In some embodiments, the particle size of the carbon nanohorn is not limited to a large extent, and may be, for example, 20nm to 400nm, or 80nm, 100nm, 150nm, 200nm, 220nm, 250nm, 280nm, 300nm, 350nm, 380nm, or the like, in order to be uniformly mixed with the polytetrafluoroethylene powder.
In some embodiments, the average particle size of the polytetrafluoroethylene is also not limited, and may be, for example, 2 μm to 10 μm, or 3 μm, 5 μm, 7 μm, 8 μm, 9 μm, or the like.
The invention also provides a preparation method of the carbon nanohorn modified polytetrafluoroethylene, which comprises the steps of pressing and sintering the mixed powder of the polytetrafluoroethylene and the carbon nanohorn.
In some embodiments, the preparation method further comprises a step of preparing carbon nanohorns, wherein the method of preparing carbon nanohorns may be any method known in the art, for example, may be CO2Laser evaporation, arc discharge, joule heating, or the like. In one specific embodiment, the carbon nanohorns are prepared by arc discharge as follows:
the graphite rod is used as an electrode, inert gas is used as buffer gas, the buffer pressure in the reaction chamber is regulated to be 0.15 MPa-0.35 MPa, and the distance between the cathode and the anode is regulated to be 1 mm-2 mm to carry out direct current arc discharge.
In some embodiments, the higher the purity of the graphite rod, the better, preferably, the purity of the graphite rod is 99.99% or more.
In some embodiments, the diameter of the graphite rod is not particularly limited and it is within the ability of one skilled in the art to select the diameter as the case may be, for example, 6mm to 15 mm.
In some embodiments, the voltage and current of the dc arc discharge are chosen according to any of the parameters commonly used in the art, for example, the voltage may independently be anywhere between 25V and 35V, and the current may independently be anywhere between 100A and 120A.
In some embodiments, the inert gas may be argon, helium, nitrogen, or the like.
In some embodiments, the powder of polytetrafluoroethylene is dried in advance before forming the mixed powder to avoid its formation into lumps. Wherein the temperature and time of drying may be within the parameters commonly used in the art. The drying temperature can be independently 23-25 ℃, and the drying time can be independently 24-28 h.
In some embodiments, the method of pressing may be cold pressing, which may have a pressure of 27MPa to 37 MPa.
In some embodiments, the temperature of sintering may be 380 ℃ to 385 ℃.
The invention also relates to a sealing element which comprises the carbon nanohorn modified polytetrafluoroethylene.
In some embodiments, the seal may be an O-ring seal or a contour seal.
The following is a more detailed description of specific examples and comparative examples.
Example 1
1) Polytetrafluoroethylene powder pretreatment
97g of PTFE powder with the average grain diameter of 2-10 mu m is placed for 24 hours at the temperature of 23-25 ℃;
2) preparation of carbon nanohorn
Graphite rods (with purity more than or equal to 99.99 percent and diameter of 6-15 mm) are used as electrodes (cathode and anode), argon is used as buffer gas, the buffer pressure in a reaction chamber is regulated to be 0.15-0.35 MPa, and direct current arc discharge is carried out in a water-cooled stainless steel chamber, the discharge current is 110A, and the voltage is 30V. The cathode is continuously rotated, so that the cathode and the anode are always kept at a constant distance of about 1-2 mm until the discharge is finished. During the discharging process, the anode graphite rod is continuously consumed to generate powder, and finally the powder at the upper part of the reaction chamber is collected to obtain carbon nanohorn powder with the average grain diameter of 50 nm;
3) preparation of carbon nanohorn modified polytetrafluoroethylene
Taking 3g of the carbon nanohorns prepared in the step 2) and the PTFE powder in the step 1) to carry out mechanical mixing. And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Example 2
This example is prepared substantially identically to example 1, except that: the mass of the carbon nanohorn was 5g, and the mass of the PTFE powder was 95 g. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 95g of PTFE powder with the average grain diameter of 2-10 mu m at 23-25 ℃ for 24 h;
2) preparation of carbon nanohorn
Graphite rods (with purity more than or equal to 99.99 percent and diameter of 6-15 mm) are used as electrodes (cathode and anode), argon is used as buffer gas, the buffer pressure in a reaction chamber is regulated to be 0.15-0.35 MPa, and direct current arc discharge is carried out in a water-cooled stainless steel chamber, the discharge current is 110A, and the voltage is 30V. The cathode is continuously rotated, so that the cathode and the anode are always kept at a constant distance of about 1-2 mm until the discharge is finished. During the discharging process, the anode graphite rod is continuously consumed to generate powder, and finally the powder at the upper part of the reaction chamber is collected to obtain carbon nanohorn powder with the average grain diameter of 50 nm;
3) preparation of carbon nanohorn modified polytetrafluoroethylene
Taking 5g of the carbon nanohorns prepared in the step 2) and the PTFE powder in the step 1) to carry out mechanical mixing. And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Example 3
This example is prepared substantially identically to example 1, except that: the mass of the carbon nanohorn was 8g, and the mass of the PTFE powder was 92 g. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 92g of PTFE powder with the average grain diameter of 2-10 mu m for 24 hours at the temperature of 23-25 ℃;
2) preparation of carbon nanohorn
Graphite rods (with purity more than or equal to 99.99 percent and diameter of 6-15 mm) are used as electrodes (cathode and anode), argon is used as buffer gas, the buffer pressure in a reaction chamber is regulated to be 0.15-0.35 MPa, and direct current arc discharge is carried out in a water-cooled stainless steel chamber, the discharge current is 110A, and the voltage is 30V. The cathode is continuously rotated, so that the cathode and the anode are always kept at a constant distance of about 1-2 mm until the discharge is finished. During the discharging process, the anode graphite rod is continuously consumed to generate powder, and finally the powder at the upper part of the reaction chamber is collected to obtain carbon nanohorn powder with the average grain diameter of 50 nm;
3) preparation of carbon nanohorn modified polytetrafluoroethylene
Taking 8g of the carbon nanohorns prepared in the step 2) and the PTFE powder in the step 1) to carry out mechanical mixing. And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Example 4
This example is prepared substantially identically to example 1, except that: the mass of the carbon nanohorn was 10g, and the mass of the PTFE powder was 90 g. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 90g of PTFE powder with the average grain diameter of 2-10 mu m at 23-25 ℃ for 24 h;
2) preparation of carbon nanohorn
Graphite rods (with purity more than or equal to 99.99 percent and diameter of 6-15 mm) are used as electrodes (cathode and anode), argon is used as buffer gas, the buffer pressure in a reaction chamber is regulated to be 0.15-0.35 MPa, and direct current arc discharge is carried out in a water-cooled stainless steel chamber, the discharge current is 110A, and the voltage is 30V. The cathode is continuously rotated, so that the cathode and the anode are always kept at a constant distance of about 1-2 mm until the discharge is finished. During the discharging process, the anode graphite rod is continuously consumed to generate powder, and finally the powder at the upper part of the reaction chamber is collected to obtain carbon nanohorn powder with the average grain diameter of 50 nm;
3) preparation of carbon nanohorn modified polytetrafluoroethylene
Taking 10g of the carbon nanohorn prepared in the step 2) and the PTFE powder in the step 1) to mechanically mix. And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Comparative example 1
This comparative example was prepared substantially identically to example 2, except that: no carbon nanohorn was added. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 100g of PTFE powder with the average grain diameter of 2-10 mu m for 24 hours at the temperature of 23-25 ℃;
2) preparation of polytetrafluoroethylene material
100g of PTFE powder is placed in a steel mould and is subjected to cold pressing under 27MPa to obtain a prefabricated member, and then the prefabricated member is placed in a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE finished piece.
Comparative example 2
This comparative example was prepared substantially identically to example 2, except that: the mass of the carbon nanohorn was 2g, and the mass of the PTFE powder was 98 g. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 98g of PTFE powder with the average grain diameter of 2-10 mu m for 24 hours at the temperature of 23-25 ℃;
2) preparation of carbon nanohorn
Graphite rods (with purity more than or equal to 99.99 percent and diameter of 6-15 mm) are used as electrodes (cathode and anode), argon is used as buffer gas, the buffer pressure in a reaction chamber is regulated to be 0.15-0.35 MPa, and direct current arc discharge is carried out in a water-cooled stainless steel chamber, the discharge current is 110A, and the voltage is 30V. The cathode is continuously rotated, so that the cathode and the anode are always kept at a constant distance of about 1-2 mm until the discharge is finished. During the discharging process, the anode graphite rod is continuously consumed to generate powder, and finally the powder at the upper part of the reaction chamber is collected to obtain carbon nanohorn powder with the average grain diameter of 50 nm;
3) preparation of carbon nanohorn modified polytetrafluoroethylene
Taking 2g of the carbon nanohorns prepared in the step 2) and the PTFE powder in the step 1) to carry out mechanical mixing. And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Comparative example 3
This comparative example was prepared substantially identically to example 2, except that: the modified filler is graphene. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 95g of PTFE powder with the average grain diameter of 2-10 mu m at 23-25 ℃ for 24 h;
2) preparation of graphene modified polytetrafluoroethylene
Taking 5g of graphene powder and mechanically mixing with the PTFE powder in the step 1). And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Comparative example 4
This comparative example was prepared substantially identically to example 2, except that: the modified filler is carbon nano tube. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 95g of PTFE powder with the average grain diameter of 2-10 mu m at 23-25 ℃ for 24 h;
2) preparation of carbon nano tube modified polytetrafluoroethylene
5g of carbon nanotube powder was mechanically mixed with the PTFE powder of step 1). And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Comparative example 5
This comparative example was prepared substantially identically to example 2, except that: the modified filler is fullerene. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 95g of PTFE powder with the average grain diameter of 2-10 mu m at 23-25 ℃ for 24 h;
2) preparation of fullerene modified polytetrafluoroethylene
5g of fullerene powder was mechanically mixed with the PTFE powder in step 1). And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
Comparative example 6
This comparative example was prepared substantially identically to example 2, except that: the modified filler was 20g of bronze powder and 5g of graphite, and the mass of PTFE was 75 g. The method comprises the following specific steps:
1) polytetrafluoroethylene powder pretreatment
Placing 75g of PTFE powder with the average grain diameter of 2-10 mu m for 24 hours at the temperature of 23-25 ℃;
2) preparation of bronze powder/graphite modified polytetrafluoroethylene
20g of bronze powder and 5g of graphite powder were mechanically mixed with the PTFE powder of step 1). And then placing the mixed powder into a steel mould, carrying out cold pressing at 27MPa to obtain a prefabricated member, and then placing the prefabricated member into a high-temperature sintering furnace for high-temperature sintering at the sintering temperature of 380 ℃ to obtain a modified PTFE (polytetrafluoroethylene) finished piece.
The components and contents of each example and comparative example are shown in table 1.
TABLE 1
| PTFE(g) | Modified filler (g) | |
| Example 1 | 97 | 3 carbon nanohorn |
| Example 2 | 95 | 5 carbon nanohorn |
| Example 3 | 92 | 8 carbon nanohorn |
| Example 4 | 90 | 10 carbon nanohorn |
| Comparative example 1 | 100 | - |
| Comparative example 2 | 98 | 2 carbon nanohorn |
| Comparative example 3 | 95 | 5 graphene |
| Comparative example 4 | 95 | 5 carbon nanotubes |
| Comparative example 5 | 95 | 5 Fullerene |
| Comparative example 6 | 75 | 20 bronze powder and 2 graphite |
Note: "-" indicates that the component is added in zero or no amount
The modified PTFE articles of the examples and comparative examples were tested for tribological properties, and the results are shown in Table 2:
1) selecting bearing steel ball
The pieces prepared in each example and comparative example were ground, the steel ball was fixed to the sensor and in close contact with the surface of the sample, the sample was fixed to and rotated with the test table, and the steel ball rotated on the surface of the sample under the principle of relative movement and left a grinding mark. The test was carried out at a rotational linear speed of 200r/min, a rotational radius of 3mm and a positive pressure (Fz) of 2N applied.
2) And (3) testing the volume wear rate by adopting a NexView three-dimensional white light interferometer, and testing the friction coefficient by adopting a controllable environment friction wear tester UMT.
TABLE 2
The test results in table 2 show that the tribological properties of the modified PTFE parts prepared in examples 1 to 4 are entirely better than those of comparative examples 1 to 6, that is, the tribological properties of the PTFE material can be significantly improved by the carbon nanohorns with lower content, and the friction coefficient and the volumetric wear rate of the PTFE material are reduced. Example 2 shows a 95% reduction in wear rate compared to comparative example 1. The related test results of the embodiment 2 and the comparative examples 2-5 show that the carbon nanohorns are selected and the content of the carbon nanohorns is regulated to modify the PTFE, and the tribological performance of the modified PTFE is obviously superior to that of the PTFE modified by graphene, carbon nanotubes and fullerene. It can be seen from the results of the related tests of example 2 and comparative example 6 that the addition of various, high amounts of conventional fillers can make the coefficient of friction of the modified PTFE comparable to that of the carbon nanohorn modified PTFE, but the volumetric wear rate is still high.
The modified PTFE articles of the examples and comparative examples were tested for mechanical properties and density, and the results are shown in Table 3:
the mechanical test comprises a tensile property test and a bending property test, and an INSTRONG universal testing machine is adopted for testing. The tensile test Standard carries out national Standard GB/T1040.1-2006, and the bending test carries out national Standard GB/T9341-2008.
TABLE 3
As can be seen from the related test results in table 3, the PTFE modified with carbon nanohorns has improved mechanical properties and lower density as a whole compared to the unmodified PTFE or the PTFE modified with other components.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The carbon nanohorn-modified polytetrafluoroethylene is characterized by comprising polytetrafluoroethylene and carbon nanohorns dispersed in the polytetrafluoroethylene, wherein the mass percentage of the carbon nanohorns in the carbon nanohorn-modified polytetrafluoroethylene is 3% -10%.
2. The carbon nanohorn-modified polytetrafluoroethylene according to claim 1, wherein the carbon nanohorn is contained in the carbon nanohorn-modified polytetrafluoroethylene in an amount of 3 to 8% by mass.
3. The carbon nanohorn-modified polytetrafluoroethylene according to claim 1 or 2, wherein the particle diameter of the carbon nanohorn is 20nm to 400 nm.
4. The carbon nanohorn-modified polytetrafluoroethylene according to claim 1 or 2, wherein an average particle diameter of the polytetrafluoroethylene is 2 μm to 10 μm.
5. A method for producing the carbon nanohorn-modified polytetrafluoroethylene as described in any one of claims 1 to 4, comprising pressing and sintering a mixed powder of the polytetrafluoroethylene and the carbon nanohorn.
6. The method of producing carbon nanohorn-modified polytetrafluoroethylene according to claim 5, wherein said polytetrafluoroethylene powder is dried at 23 ℃ to 25 ℃ in advance before said mixed powder is formed.
7. The method for preparing carbon nanohorn-modified polytetrafluoroethylene according to claim 5, wherein said pressing is cold pressing at a pressure of 27 to 37 MPa.
8. The method for producing carbon nanohorn-modified polytetrafluoroethylene according to any one of claims 5 to 7, wherein the sintering temperature is 380 ℃ to 385 ℃.
9. A sealing member comprising the carbon nanohorn-modified polytetrafluoroethylene as set forth in any one of claims 1 to 4.
10. The seal of claim 9, wherein the seal is an O-ring or a contour seal.
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