CN113956660A - Silver nanowire modified polyimide-based friction material and preparation method and application thereof - Google Patents
Silver nanowire modified polyimide-based friction material and preparation method and application thereof Download PDFInfo
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- CN113956660A CN113956660A CN202111334519.XA CN202111334519A CN113956660A CN 113956660 A CN113956660 A CN 113956660A CN 202111334519 A CN202111334519 A CN 202111334519A CN 113956660 A CN113956660 A CN 113956660A
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Abstract
The invention provides a silver nanowire modified polyimide-based friction material and a preparation method and application thereof, and relates to the technical field of friction materials. The silver nanowire modified polyimide-based friction material provided by the invention can improve the friction coefficient stability of the friction material and greatly reduce the wear rate of the composite material. The invention applies the silver nanowires to the friction material of the ultrasonic motor for the first time to improve the running stability of the ultrasonic motor under the high-temperature working condition.
Description
Technical Field
The invention relates to the technical field of friction materials, in particular to a silver nanowire modified polyimide-based friction material and a preparation method and application thereof.
Background
The ultrasonic motor utilizes the inverse piezoelectric effect of piezoelectric materials to enable the stator to generate micro-mechanical vibration in an ultrasonic frequency band, and micro-vibration of the stator is converted into macro motion of the rotor through the friction effect between the stator and the rotor, so that the ultrasonic motor is a novel precise driving micro-special motor. The ultrasonic motor has the advantages of high precision, light weight, high response speed, good electromagnetic compatibility and the like. With the application of the ultrasonic motor in the field of aerospace, the use environment of the ultrasonic motor is gradually improved to 120 ℃ from the original room temperature, the friction and wear performance of the friction material is seriously influenced by the rise of the temperature, and the output characteristic is reduced by reflecting the temperature on the ultrasonic motor, so that the operation stability and reliability of the friction material of the ultrasonic motor under the high-temperature condition are important in the current research. The most direct reflection of the running stability and reliability of the ultrasonic motor is the friction coefficient of the material. The friction material has a more stable coefficient of friction change at different temperatures.
The polyimide is an aromatic polymer and has strong molecular rigidity; the polyimide has high strength, excellent thermal stability and chemical stability, but the pure polyimide cannot keep the output characteristics of the ultrasonic motor at high temperature.
Disclosure of Invention
The invention aims to provide a silver nanowire modified polyimide-based friction material, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a silver nanowire modified polyimide-based friction material which comprises the following preparation raw materials in parts by weight: 70-85 parts of polyimide and 15-30 parts of silver nanowires.
Preferably, the silver nanowires are dispersed on a polyimide matrix.
Preferably, the length of the silver nanowire is 5-15 mu m, and the specific surface area is 5-15 m2(ii)/g, the average diameter is 50 to 100 nm.
The invention provides a preparation method of a silver nanowire modified polyimide-based friction material, which comprises the following steps:
performing ball milling and mixing on polyimide and silver nanowires to obtain mixed powder;
and pressing the mixed powder to obtain the silver nanowire modified polyimide-based friction material.
Preferably, the ball milling mixing is wet milling; the wet grinding medium is absolute ethyl alcohol.
Preferably, the rotation speed of the ball milling mixing is 150-200 r/min; the ball milling and mixing time is 4-6 h.
Preferably, the ball milling mixing further comprises: and (4) carrying out solid-liquid separation, washing and drying on the ball-milled mixed material in sequence to obtain mixed powder.
Preferably, the drying temperature is 90-100 ℃; the drying time is 3-5 h.
Preferably, the pressing pressure is 10-20 MPa; the pressing temperature is 360-380 ℃; the heat preservation and pressure maintaining time is 150-200 min.
The invention provides an application of the silver nanowire modified polyimide-based friction material in the technical scheme or the silver nanowire modified polyimide-based friction material prepared by the preparation method in the technical scheme in an ultrasonic motor.
The silver nanowire modified polyimide-based friction material provided by the invention can improve the friction coefficient stability of the friction material and greatly reduce the wear rate of a composite material. The invention applies the silver nanowires to the friction material of the ultrasonic motor for the first time to improve the running stability of the ultrasonic motor under the high-temperature working condition.
Drawings
Fig. 1 is a topography of silver nanowires.
Detailed Description
The invention provides a silver nanowire modified polyimide-based friction material which comprises the following preparation raw materials in parts by weight: 70-85 parts of polyimide and 15-30 parts of silver nanowires.
In the present invention, the silver nanowires are preferably dispersed on the polyimide matrix, and more preferably, the silver nanowires are dispersed both inside and on the surface of the polyimide matrix.
In the invention, the raw materials for preparing the silver nanowire modified polyimide-based friction material comprise, by weight, 70-85 parts of polyimide, preferably 75-80 parts of polyimide. In the present invention, the particle size of the polyimide is preferably 25 to 35 μm, and more preferably 28 to 30 μm. The particle size of the polyimide is limited to be in the range, and the dispersion uniformity of the silver nanowires is improved.
In the invention, the polyimide is used as a reference in parts by weight, and the raw materials for preparing the silver nanowire modified polyimide-based friction material comprise 15-30 parts of silver nanowires, preferably 20-25 parts of silver nanowires. In the invention, the length of the silver nanowire is preferably 5-15 μm, and more preferably 10 μm. The specific surface area is preferably 5-15 m2A/g, more preferably 10m2The average diameter is preferably 50 to 100nm, more preferably 80 nm.
The invention provides a preparation method of a silver nanowire modified polyimide-based friction material, which comprises the following steps:
performing ball milling and mixing on polyimide and silver nanowires to obtain mixed powder;
and pressing the mixed powder to obtain the silver nanowire modified polyimide-based friction material.
The silver nanowires can be directly used as fillers to be compounded with polyimide to be pressed into the composite material, so that the pollution to the environment in the processing process can be avoided.
According to the invention, the polyimide and the silver nanowires are subjected to ball milling and mixing to obtain mixed powder. In the present invention, the ball milling mixing is preferably wet milling; the wet milling medium is preferably absolute ethanol. In the invention, the dosage ratio of the absolute ethyl alcohol to the polyimide is preferably 1-2L: 70-85 g, more preferably 1.5L: 75-80 g. According to the invention, the polyimide and the silver nanowires are preferably subjected to ultrasonic dispersion in absolute ethyl alcohol and then ball milling and mixing. In the invention, the time for ultrasonic dispersion is preferably 25-35 min, and more preferably 30 min.
The invention can improve the dispersibility of the silver nanowires in the polyimide matrix by adopting wet grinding and mixing.
In the invention, the rotation speed of the ball milling mixing is preferably 150-200 r/min, and more preferably 175-180 r/min; the time for ball milling and mixing is preferably 4-6 h, and more preferably 4.6-5 h.
The invention preferably further comprises, after said ball milling mixing: and (4) carrying out solid-liquid separation, washing and drying on the ball-milled mixed material in sequence to obtain mixed powder. In the present invention, the method of solid-liquid separation is preferably suction filtration. In the present invention, the washing detergent is preferably absolute ethanol. In the invention, the drying temperature is preferably 90-100 ℃, and more preferably 95-98 ℃; the drying time is preferably 3-5 h, and more preferably 4 h.
After the mixed powder is obtained, the mixed powder is pressed to obtain the silver nanowire modified polyimide-based friction material. In the invention, the pressing pressure is preferably 10-20 MPa, and more preferably 15-18 MPa; the pressing temperature is preferably 360-380 ℃, and more preferably 370-375 ℃; the heat preservation and pressure maintaining time is preferably 150-200 min, and more preferably 160-180 min. In the present invention, the rate of temperature increase from room temperature to the pressing temperature is preferably 5 to 10 ℃/min, and more preferably 6 to 8 ℃/min.
In the present invention, the pressing is preferably performed in a mold. According to the invention, preferably, after the pressing is finished, the temperature is reduced to room temperature for demolding, and the silver nanowire modified polyimide-based friction material is obtained.
The invention also provides the application of the silver nanowire modified polyimide-based friction material in the technical scheme or the silver nanowire modified polyimide-based friction material prepared by the preparation method in the technical scheme in an ultrasonic motor, and the silver nanowire modified polyimide-based friction material is preferably used as an ultrasonic motor friction material.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following examples and comparative examples employ the starting materials:
polyimide (I): shanghai institute for synthetic resins;
silver nanowires: the silver nanowires of Beijing German island gold technology ltd are adopted, as shown in figure 1, the average length of the silver nanowires is 10 μm, and the specific surface area is 10m2In g, the mean diameter is 80 nm.
Example 1
Ultrasonically dispersing 85g of polyimide and 15g of silver nanowires in 1L of absolute ethyl alcohol for 30min, and ball-milling for 4h by using a ball mill at the rotating speed of 150 revolutions per minute; filtering, washing, and drying in a 90 ℃ oven for 3h to obtain mixed powder;
and (3) putting the mixed powder into a mold, heating the mixed powder to 380 ℃ from room temperature at the heating rate of 5 ℃/min under the pressure of 20MPa, carrying out mold pressing for 200min, cooling to room temperature, and demolding to obtain the silver nanowire modified polyimide-based friction material.
Example 2
Ultrasonically dispersing 80g of polyimide and 20g of silver nanowires in 2L of absolute ethyl alcohol for 35min, and ball-milling for 6h by using a ball mill at the rotating speed of 200 revolutions per minute; filtering, washing, and drying in an oven at 100 deg.C for 5 hr to obtain mixed powder;
and (3) putting the mixed powder into a mold, heating the mixed powder to 360 ℃ from room temperature at a heating rate of 10 ℃/min under the pressure of 10MPa, carrying out mold pressing for 150min, cooling to room temperature, and demolding to obtain the silver nanowire modified polyimide-based friction material.
Example 3
Ultrasonically dispersing 75g of polyimide and 25g of silver nanowires in 1.5L of absolute ethyl alcohol for 32min, and ball-milling for 5h by using a ball mill at the rotating speed of 180 r/min; filtering, washing, and drying in a 95 deg.C oven for 4h to obtain mixed powder;
and (3) putting the mixed powder into a mold, heating the mixed powder to 370 ℃ from room temperature at the heating rate of 6 ℃/min under the pressure of 15MPa, carrying out mold pressing for 180min, cooling to room temperature, and demolding to obtain the silver nanowire modified polyimide-based friction material.
Example 4
Ultrasonically dispersing 70g of polyimide and 30g of silver nanowires in 1.8L of absolute ethyl alcohol for 25min, and ball-milling for 4.6h by using a ball mill at the rotating speed of 175 r/min; filtering, washing, and drying in oven at 98 deg.C for 4 hr to obtain mixed powder;
and (3) putting the mixed powder into a mold, heating the mixed powder to 375 ℃ from room temperature at the heating rate of 8 ℃/min under the pressure of 18MPa, molding for 185min, cooling to room temperature, and demolding to obtain the silver nanowire modified polyimide-based friction material.
Comparative example 1
Essentially the same as example 4, except that no silver nanowires were added.
Test example
The friction coefficients of the polyimide-based friction materials prepared in examples 1 to 4 and comparative example 1 were measured, as shown in table 1.
The test conditions were: the test loading force is 5N, the rotating speed is 0.1m/s, the running time is 2 hours, and the temperature is room temperature, 60 ℃, 80 ℃, 100 ℃ and 120 ℃. The friction coefficient is the average value of 3-5 tests.
TABLE 1 Friction coefficients of polyimide-based friction materials prepared in examples 1 to 4 and comparative example 1
As can be seen from table 1, the silver nanowires can improve the stability of the friction coefficient and reduce the temperature sensitivity of the friction material. It can be seen from example 4 and comparative example 1 that the difference in the friction coefficient of the polyimide friction material from room temperature to 120 c was reduced from 0.20 to 0.07 by adding a proper amount of silver nanowires.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A silver nanowire modified polyimide-based friction material comprises the following preparation raw materials in parts by weight: 70-85 parts of polyimide and 15-30 parts of silver nanowires.
2. The silver nanowire-modified polyimide-based friction material of claim 1, wherein the silver nanowires are dispersed on a polyimide matrix.
3. The silver nanowire-modified polyimide-based friction material according to claim 1, wherein the silver nanowires have a length of 5 to 15 μm and a specific surface area of 5 to 15m2(ii)/g, the average diameter is 50 to 100 nm.
4. The method for preparing a silver nanowire-modified polyimide-based friction material according to any one of claims 1 to 3, comprising the steps of:
performing ball milling and mixing on polyimide and silver nanowires to obtain mixed powder;
and pressing the mixed powder to obtain the silver nanowire modified polyimide-based friction material.
5. The method of claim 4, wherein the ball milling mixing is wet milling; the wet grinding medium is absolute ethyl alcohol.
6. The preparation method according to claim 4 or 5, wherein the rotation speed of the ball milling and mixing is 150-200 r/min; the ball milling and mixing time is 4-6 h.
7. The method of claim 5, further comprising, after said ball milling and mixing: and (4) carrying out solid-liquid separation, washing and drying on the ball-milled mixed material in sequence to obtain mixed powder.
8. The preparation method according to claim 7, wherein the drying temperature is 90-100 ℃; the drying time is 3-5 h.
9. The preparation method according to claim 4, wherein the pressure of the pressing is 10 to 20 MPa; the pressing temperature is 360-380 ℃; the heat preservation and pressure maintaining time is 150-200 min.
10. The application of the silver nanowire modified polyimide-based friction material as defined in any one of claims 1 to 3 or the silver nanowire modified polyimide-based friction material prepared by the preparation method as defined in any one of claims 4 to 9 in an ultrasonic motor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115433420A (en) * | 2022-08-31 | 2022-12-06 | 河南师范大学 | Polyvinyl alcohol/silver nanowire friction nanometer generator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018045980A1 (en) * | 2016-09-08 | 2018-03-15 | 北京纳米能源与系统研究所 | Deformable flexible nano generator and manufacturing method therefor, sensor and robot |
| CN111022535A (en) * | 2019-12-27 | 2020-04-17 | 中国科学院兰州化学物理研究所 | Modified polyimide friction material for wind power yaw brake and preparation method thereof |
| CN111303627A (en) * | 2020-03-13 | 2020-06-19 | 中国科学院兰州化学物理研究所 | Polyimide friction material and preparation method and application thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018045980A1 (en) * | 2016-09-08 | 2018-03-15 | 北京纳米能源与系统研究所 | Deformable flexible nano generator and manufacturing method therefor, sensor and robot |
| CN111022535A (en) * | 2019-12-27 | 2020-04-17 | 中国科学院兰州化学物理研究所 | Modified polyimide friction material for wind power yaw brake and preparation method thereof |
| CN111303627A (en) * | 2020-03-13 | 2020-06-19 | 中国科学院兰州化学物理研究所 | Polyimide friction material and preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433420A (en) * | 2022-08-31 | 2022-12-06 | 河南师范大学 | Polyvinyl alcohol/silver nanowire friction nanometer generator |
| CN115433420B (en) * | 2022-08-31 | 2023-09-12 | 河南师范大学 | Friction nano generator based on polyvinyl alcohol/silver nanowire |
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