CN111350083B - Fabric composite material for ultrasonic motor and preparation method and application thereof - Google Patents
Fabric composite material for ultrasonic motor and preparation method and application thereof Download PDFInfo
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
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- D06N2201/00—Chemical constitution of the fibres, threads or yarns
- D06N2201/02—Synthetic macromolecular fibres
- D06N2201/0218—Vinyl resin fibres
- D06N2201/0236—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
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- D06N2201/00—Chemical constitution of the fibres, threads or yarns
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- D06N2209/103—Resistant to mechanical forces, e.g. shock, impact, puncture, flexion, shear, compression, tear
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Abstract
The invention provides a fabric composite material for an ultrasonic motor, and a preparation method and application thereof, and belongs to the technical field of ultrasonic motor friction materials. The method comprises the following steps: mixing phenolic resin, ethyl acetate and copper powder, and dispersing to obtain a coating solution; coating the coating liquid on the surface of a fabric, drying, and then curing and molding to obtain the fabric composite material for the ultrasonic motor; the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric. According to the invention, copper powder is introduced into the fabric composite material, the prepared fabric composite material has high friction coefficient and good wear resistance, and the fabric composite material is successfully applied to the friction material of the ultrasonic motor, so that an excellent effect is obtained, and the fabric composite material has great application value in the field of friction materials of the ultrasonic motor.
Description
Technical Field
The invention relates to the technical field of ultrasonic motor friction materials, in particular to a fabric composite material for an ultrasonic motor and a preparation method and application thereof.
Background
The ultrasonic motor is a novel precise driving micro-special motor and has the advantages of high precision, light weight, high response speed, good electromagnetic compatibility and the like. The ultrasonic motor is more and more emphasized in China, and has wide application prospect in the fields of aerospace, high-end weaponry, biomedical treatment and the like. However, the development of the ultrasonic motor is difficult due to the small power output, low efficiency and short service life.
The friction material is the heart of an ultrasonic motor, and most of the friction materials of the ultrasonic motor researched at present are polytetrafluoroethylene-based friction materials and polyimide-based friction materials. However, both materials have disadvantages, i.e., the low coefficient of friction of the teflon-based friction material results in low output efficiency of the ultrasonic motor; although the friction coefficient of the polyimide-based friction material is high, the wear is severe under ultrasonic micro-vibration conditions, resulting in a short motor life. Therefore, the tribological performance of the existing ultrasonic motor friction material still needs to be improved.
Disclosure of Invention
The invention aims to provide a fabric composite material for an ultrasonic motor, 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 preparation method of a fabric composite material for an ultrasonic motor, which comprises the following steps:
mixing phenolic resin, ethyl acetate and copper powder, and dispersing to obtain a coating solution;
coating the coating liquid on the surface of a fabric, drying, and then curing and molding to obtain the fabric composite material for the ultrasonic motor;
the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric.
Preferably, the mass ratio of the phenolic resin to the ethyl acetate to the copper powder is (20-30) to (30-60) to (1-3).
Preferably, the dispersion is carried out under ultrasonic conditions, the power of the ultrasonic is 500W, and the dispersion time is 25-35 min.
Preferably, the fabric is a fiber fabric, the thickness of the fabric is 0.2-0.3 mm, and the specification is 40s/5×800D。
Preferably, the coating solution is applied to the surface of the fabric repeatedly for multiple times until the weight of the fabric is increased by 40-60%.
Preferably, the drying temperature is room temperature, and the drying time is 10-12 h.
Preferably, the pressure of the curing molding is 0.1-0.3 MPa, the temperature is 110-120 ℃, and the time is 8-10 h.
Preferably, the heating rate of heating to the curing molding temperature is 5-10 ℃/min.
The invention provides the fabric composite material for the ultrasonic motor, which is prepared by the preparation method in the technical scheme.
The invention provides the fabric composite material for the ultrasonic motor prepared by the preparation method in the technical scheme or the application of the fabric composite material for the ultrasonic motor in serving as the friction material of the ultrasonic motor.
The invention provides a preparation method of a fabric composite material for an ultrasonic motor, which comprises the following steps: mixing phenolic resin, ethyl acetate and copper powder, and dispersing to obtain a coating solution; coating the coating liquid on the surface of a fabric, drying, and then curing and molding to obtain the fabric composite material for the ultrasonic motor; the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric. The copper powder has good thermal conductivity, can quickly transfer heat generated by a friction interface, improves the thermal conductivity of the fabric composite material, improves the tribological performance of the fabric composite material, ensures the stability of the material structure, enhances the strength of the composite material, and is beneficial to improving the load bearing capacity, the stability of the friction coefficient and the wear resistance; the polytetrafluoroethylene-aramid fiber mixed woven fabric has high orderliness and compactness in structure, and has higher bearing capacity, wear resistance and excellent specific strength compared with single fiber. According to the invention, copper powder is introduced into the fabric composite material, and the prepared fabric composite material has high friction coefficient and good wear resistance by utilizing the respective advantages of the copper powder and the fabric composite material, and the prepared fabric composite material is successfully applied to the friction material of the ultrasonic motor, so that an excellent effect is obtained, and the fabric composite material has great application value in the field of the friction material of the ultrasonic motor.
The preparation method is simple and quick, the material processing is convenient, and lathe processing is not needed.
Drawings
Fig. 1 is a surface topography diagram of a polytetrafluoroethylene-aramid fiber hybrid fabric used in the present invention.
Detailed Description
The invention provides a preparation method of a fabric composite material for an ultrasonic motor, which comprises the following steps:
mixing phenolic resin, ethyl acetate and copper powder, and dispersing to obtain a coating solution;
coating the coating liquid on the surface of a fabric, drying, and then curing and molding to obtain the fabric composite material for the ultrasonic motor;
the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The coating liquid is prepared by mixing and dispersing phenolic resin, ethyl acetate and copper powder. In the invention, the particle size of the copper powder is preferably 1-3 μm; the copper powder is preferably from Beijing Germany island gold science and technology limited; the ethyl acetate is preferably supplied from Shanghai Hui Chuang chemical instruments, Inc. In the invention, the mass ratio of the phenolic resin to the ethyl acetate to the copper powder is preferably (20-30): 30-60): 1-3, and more preferably (22-26): 40-50): 1.5-2.5. The mixing process is not particularly limited in the invention, and the raw materials can be uniformly mixed by selecting the process well known in the field. The invention uses phenolic resin as a binder and ethyl acetate as a solvent for dispersing the phenolic resin and the copper powder.
In the invention, the copper powder can enhance the strength of the fabric composite material, and is beneficial to improving the load bearing capacity; in addition, the copper powder is beneficial to the formation of a dual surface transfer film, the transfer film has very important influence on the frictional wear performance of a friction material, and the copper powder is used as a main contact area in the friction process, plays the role of bearing and transmitting stress and avoids the direct contact of a friction pair; when the generation and destruction of the third body layer reach equilibrium, the friction process enters a plateau, the friction coefficient becomes plateau and the wear of the material is reduced.
In the invention, the dispersion is preferably carried out under ultrasonic conditions, the power of the ultrasonic is preferably 500W, and the time of the dispersion is preferably 25-35 min, and more preferably 30 min. The invention obtains the evenly mixed coating liquid by dispersion under the ultrasonic condition.
After the coating liquid is obtained, the coating liquid is coated on the surface of the fabric, and the fabric composite material for the ultrasonic motor is obtained after drying and curing molding.
In the invention, the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric; the thickness of the fabric is preferably 0.2-0.3 mm, more preferably 0.23-0.25 mm, and the specification is preferably 40s/5X 800D. The source of the fabric is not particularly limited in the invention, and the fabric is selected from those skilled in the artCommercially available products satisfying the above specifications are only required. The surface topography of the polytetrafluoroethylene-aramid fiber hybrid fabric used in the invention is shown in figure 1, and the fabric has high orderliness and compactness in structure, higher carrying capacity and wear resistance and excellent specific strength compared with single fiber.
In the invention, the coating solution is preferably applied to the surface of the fabric repeatedly for multiple times until the weight of the fabric is increased by 40-60%, more preferably 45-55%, and even more preferably 50%. In the repeated coating process, every time one coating is finished, the coated fabric is preferably dried for 20-30 s, and then the next coating is carried out until the target weight increment is achieved; the drying mode is not particularly limited, and the drying mode can be specifically drying by a blower. The coating mode is not particularly limited in the invention, and a mode well known in the field can be selected, and the coating mode can be specifically a brush coating mode.
After the coating is finished, the coated fabric is preferably dried, the drying temperature is preferably room temperature, and the drying time is preferably 10-12 hours.
In the invention, the curing molding pressure is preferably 0.1-0.3 MPa, more preferably 0.15-0.25 MPa, the temperature is preferably 110-120 ℃, more preferably 115 ℃, and the time is preferably 8-10 h, more preferably 8.5-9.5 h; the heating rate from room temperature to the curing molding temperature is preferably 5-10 ℃/min, and more preferably 6-8 ℃/min. The curing and forming equipment is not particularly limited in the present invention, and equipment well known in the art can be selected.
In order to test the performance of the fabric composite material for the ultrasonic motor, in the embodiment of the invention, before curing and forming, the dried fabric is preferably attached to the surface of the rotor of the ultrasonic motor by using epoxy resin, pressure is applied, and the temperature is raised to the curing and forming temperature from the rising temperature, so that curing and forming are performed. During the curing process, the epoxy resin is cured to bond the fabric to the metal on the rotor.
In the invention, after the curing molding is finished, the fabric composite material for the ultrasonic motor can be obtained without post-treatment. In the fabric composite material for the ultrasonic motor, components in the coating liquid are uniformly distributed on the surface of the fabric, namely copper is uniformly distributed on the surface of the fabric.
The invention provides the fabric composite material for the ultrasonic motor, which is prepared by the preparation method in the technical scheme.
The invention provides the fabric composite material for the ultrasonic motor prepared by the preparation method in the technical scheme or the application of the fabric composite material for the ultrasonic motor in serving as the friction material of the ultrasonic motor.
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.
Example 1
Mixing 20g of phenolic resin, 30g of ethyl acetate and 1g of copper powder (the particle size of the copper powder is 1-3 mu m), and dispersing for 25min under the ultrasonic (the power is 500W) condition to obtain a coating solution; uniformly coating the coating solution on a polytetrafluoroethylene-aramid fiber mixed fabric (the thickness of the fabric is 0.25mm, and the specification is 40) by using a brushs5 x 800D), drying for 20s by using a blower, repeatedly coating for many times to increase the weight of the fabric by 40%, and drying the coated fabric for 10h at room temperature; and (3) sticking the dried fabric on the surface of the rotor of the ultrasonic motor by using epoxy resin, applying pressure of 0.25MPa, heating the dried fabric to 110 ℃ from room temperature at the speed of 5 ℃/min, curing for 8h, and forming to obtain the fabric composite material.
Example 2
Mixing 30g of phenolic resin, 44g of ethyl acetate and 3g of copper powder (the particle size of the copper powder is 1-3 mu m), and dispersing for 35min under the ultrasonic (the power is 500W) condition to obtain a coating solution; uniformly coating the coating solution on polytetrafluoroethylene-aramid fiber mixed fabric (fabric) by using a brushHas a thickness of 0.25mm and a specification of 40s5 × 800D), drying for 30s by using a blower, repeatedly coating for many times to increase the weight of the fabric by 60%, and drying the coated fabric for 12h at room temperature; and (3) sticking the dried fabric on the surface of the rotor of the ultrasonic motor by using epoxy resin, applying pressure of 0.3MPa, heating the dried fabric to 120 ℃ from room temperature at the speed of 10 ℃/min, curing for 10h, and forming to obtain the fabric composite material.
Example 3
Mixing 20g of phenolic resin, 50g of ethyl acetate and 2.6g of copper powder (the particle size of the copper powder is 1-3 mu m), and dispersing for 30min under the condition of ultrasound (the power is 500W) to obtain a coating solution; uniformly coating the coating solution on a polytetrafluoroethylene-aramid fiber mixed fabric (the thickness of the fabric is 0.25mm, and the specification is 40) by using a brushs5 × 800D), drying for 25s by using a blower, repeatedly coating for many times to increase the weight of the fabric by 45%, and drying the coated fabric for 11h at room temperature; and (3) sticking the dried fabric on the surface of the rotor of the ultrasonic motor by using epoxy resin, applying pressure of 0.25MPa, heating the dried fabric to 117 ℃ from room temperature at the speed of 6 ℃/min, curing for 8.5h, and forming to obtain the fabric composite material.
Example 4
Mixing 28g of phenolic resin, 30g of ethyl acetate and 1.1g of copper powder (the particle size of the copper powder is 1-3 mu m), and dispersing for 28min under the condition of ultrasound (the power is 500W) to obtain a coating solution; uniformly coating the coating solution on a polytetrafluoroethylene-aramid fiber mixed fabric (the thickness of the fabric is 0.25mm, and the specification is 40) by using a brushsPer 5 × 800D), drying for 28s by using a blower, repeatedly coating for many times to increase the weight of the fabric by 58%, and drying the coated fabric for 11h at room temperature; and (3) sticking the dried fabric on the surface of the rotor of the ultrasonic motor by using epoxy resin, applying pressure of 0.23MPa, heating the dried fabric to 114 ℃ from room temperature at the speed of 9 ℃/min, curing for 9.5h, and forming to obtain the fabric composite material.
Comparative example 1
Mixing 28g of phenolic resin and 30g of ethyl acetate, and dispersing for 28min under the condition of ultrasound (power is 500W) to obtain a coating solution; uniformly coating the coating liquid on polytetrafluoroethylene by using a brushAramid fiber mixed fabric (the thickness of the fabric is 0.25mm, the specification is 40)sPer 5 × 800D), drying for 28s by using a blower, repeatedly coating for many times to increase the weight of the fabric by 58%, and drying the coated fabric for 11h at room temperature; and (3) sticking the dried fabric on the surface of the rotor of the ultrasonic motor by using epoxy resin, applying pressure of 0.23MPa, heating the dried fabric to 114 ℃ from room temperature at the speed of 9 ℃/min, curing for 9.5h, and forming to obtain the fabric composite material.
Performance testing
The test conditions were: the fabric composite materials prepared in examples 1-4 and comparative example 1 are subjected to opposite grinding with a phosphor bronze stator, the test loading force is 100N, the rotating speed is 180r/min, the running time is 2h, and the friction coefficient and the wear rate of the fabric composite materials are measured, wherein the friction coefficient and the wear rate are average values of 3-5 tests, and the specific results are shown in table 1.
TABLE 1 Friction coefficient and wear Rate of the Fabric composites prepared in examples 1-4 and comparative example 1
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | |
| Coefficient of friction | 0.297 | 0.301 | 0.310 | 0.265 | 0.331 |
| Wear rate g/h | 0.0010 | 0.0012 | 0.0017 | 0.0008 | 0.0034 |
As can be seen from Table 1, the fabric composite material prepared in comparative example 1 has a higher friction coefficient without adding copper powder, while the fabric composite material prepared in examples 1 to 4 of the present invention has a reduced friction coefficient, i.e., improved wear resistance, after adding copper powder, which indicates that the copper powder modified fabric composite material of the present invention has excellent wear resistance under the combined action of copper powder and fabric. The friction material of the ultrasonic motor is required to have a relatively proper friction coefficient (about 0.2-0.3) and an extremely low wear rate, and generally, the friction coefficient is better to be close to about 0.3. From the results, it can be seen that the copper powder modified fabric composite material prepared by the invention has a proper friction coefficient and excellent wear resistance. Therefore, the material has wide application prospect when being applied to the friction material of the ultrasonic motor.
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 (7)
1. The preparation method of the fabric composite material for the ultrasonic motor is characterized by comprising the following steps of:
mixing phenolic resin, ethyl acetate and copper powder, and dispersing to obtain a coating solution;
coating the coating liquid on the surface of a fabric, drying, and then curing and molding to obtain the fabric composite material for the ultrasonic motor;
the fabric is a polytetrafluoroethylene-aramid fiber mixed fabric;
the mass ratio of the phenolic resin to the ethyl acetate to the copper powder is (20-30) to (30-60) to (1-3);
the thickness of the fabric is 0.2-0.3 mm, and the specification is 40s /5×800D；
The coating liquid is coated on the surface of the fabric repeatedly for multiple times until the weight of the fabric is increased by 40-60%.
2. The preparation method according to claim 1, wherein the dispersion is performed under ultrasonic conditions, the power of the ultrasonic is 500W, and the dispersion time is 25-35 min.
3. The preparation method according to claim 1, wherein the drying temperature is room temperature and the drying time is 10-12 h.
4. The preparation method according to claim 1, wherein the curing molding pressure is 0.1-0.3 MPa, the temperature is 110-120 ℃, and the time is 8-10 h.
5. The production method according to claim 4, wherein a temperature rise rate of raising the temperature to the temperature for curing and molding is 5 to 10 ℃/min.
6. The fabric composite material for the ultrasonic motor, which is prepared by the preparation method of any one of claims 1 to 5.
7. The fabric composite material for the ultrasonic motor prepared by the preparation method of any one of claims 1 to 5 or the application of the fabric composite material for the ultrasonic motor of claim 6 as a friction material of the ultrasonic motor.
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| CN202010181780.XA CN111350083B (en) | 2020-03-16 | 2020-03-16 | Fabric composite material for ultrasonic motor and preparation method and application thereof |
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| CN112759890B (en) * | 2021-01-04 | 2021-11-02 | 中国科学院兰州化学物理研究所 | Manganese dioxide modified fiber fabric composite material for ultrasonic motor and preparation method and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007044889A2 (en) * | 2005-10-11 | 2007-04-19 | Board Of Trustees Of Southern Illinois University | Composite friction materials having carbon nanotube and carbon nanofiber friction enhancers |
| CN102585125A (en) * | 2012-02-17 | 2012-07-18 | 广州三则电子材料有限公司 | Method for preparing thermoset phenolic resin and method for preparing conductive slurry |
| CN106566471A (en) * | 2016-09-21 | 2017-04-19 | 南京航空航天大学 | Phenolic resin based friction material for ultrasonic motors and preparation method thereof |
| CN107365477A (en) * | 2017-07-27 | 2017-11-21 | 哈尔滨工业大学 | Textile type self-lubricating composite and preparation method thereof |
| CN110819064A (en) * | 2019-12-03 | 2020-02-21 | 株洲时代新材料科技股份有限公司 | High-thermal-conductivity wear-resistant self-lubricating liner and preparation method thereof |
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2020
- 2020-03-16 CN CN202010181780.XA patent/CN111350083B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007044889A2 (en) * | 2005-10-11 | 2007-04-19 | Board Of Trustees Of Southern Illinois University | Composite friction materials having carbon nanotube and carbon nanofiber friction enhancers |
| CN102585125A (en) * | 2012-02-17 | 2012-07-18 | 广州三则电子材料有限公司 | Method for preparing thermoset phenolic resin and method for preparing conductive slurry |
| CN106566471A (en) * | 2016-09-21 | 2017-04-19 | 南京航空航天大学 | Phenolic resin based friction material for ultrasonic motors and preparation method thereof |
| CN107365477A (en) * | 2017-07-27 | 2017-11-21 | 哈尔滨工业大学 | Textile type self-lubricating composite and preparation method thereof |
| CN110819064A (en) * | 2019-12-03 | 2020-02-21 | 株洲时代新材料科技股份有限公司 | High-thermal-conductivity wear-resistant self-lubricating liner and preparation method thereof |
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