Heavy duty truck clutch plate and method of making same

Abstract

This application relates to a friction plate for a heavy-duty truck clutch and its preparation method. The method involves dissolving resin powder and carbon nanotube powder in a solvent to prepare a mixed resin slurry; adding filler to rubber for intensive mixing and open milling, with carbon nanotube powder added during the open milling process to obtain a mixed rubber; impregnating composite fibers with the mixed resin slurry, and then extruding the mixed rubber onto the composite fibers coated with the mixed resin slurry to obtain a fiber prepreg tape; winding the fiber prepreg tape into a friction plate blank, and then hot-pressing and vulcanizing it to obtain the friction plate. Carbon nanotubes are added to both the resin and rubber. Carbon nanotubes possess good mechanical and thermal conductivity properties, which can improve the bonding force between the matrix formed by the mixed resin slurry and mixed rubber and the composite fibers, and improve the thermal conductivity of the matrix and the thermal conductivity between the matrix and the composite fibers, thereby improving the thermal conductivity of the friction plate and preventing slippage due to overheating.

Description

Technical Field

[0001] This application relates to the field of automotive engine technology, and in particular to a friction plate for a heavy-duty truck clutch and its preparation method. Background Technology

[0002] The friction pair of a heavy-duty truck clutch includes a driving plate, a driven plate, and a friction plate with wave-shaped plates between the driving and driven plates. When the truck is in a semi-engaged state, the flywheel rotates the fastest, followed by the friction plate, and the pressure plate rotates the slowest. The friction plate has relative movement with both the flywheel and the pressure plate, which is sliding friction. At this time, the friction plate generates the most heat. The friction coefficient of the friction plate decreases significantly as the temperature rises. When heavy-duty trucks are driven in high-altitude areas, they often need to brake continuously, causing the temperature of the clutch friction plate to exceed 350°C, resulting in high-temperature "slippage" of the clutch, which in turn affects driving safety. Therefore, improving the thermal conductivity of the clutch friction plate is crucial.

[0003] Truck clutch friction plates are mainly composed of a resin matrix, copper wires, and glass fibers. The copper wires and glass fibers have good wettability with the resin matrix, connecting the matrix into a single piece and increasing the mechanical strength and toughness of the truck clutch friction plate. Furthermore, the copper wires are interwoven within the resin matrix, improving the thermal conductivity of the truck clutch friction plate. The resin matrix is ​​mainly composed of rubber powder, graphite sheets, and inorganic fillers. The graphite sheets play a role in improving the thermal conductivity of the truck clutch friction plate. However, as the operating conditions of heavy-duty trucks become increasingly harsh, the friction plate's insufficient thermal conductivity leads to heat accumulation that causes matrix decomposition, resulting in "slippage" or fracture due to thermal stress. Therefore, its overall thermal conductivity needs further improvement. Summary of the Invention

[0004] This application provides a heavy-duty truck clutch friction plate and its preparation method to solve the problem that insufficient thermal conductivity in related technologies makes the clutch friction plate prone to "slipping" due to overheating.

[0005] In a first aspect, a method for preparing friction plates for heavy-duty truck clutches is provided, comprising the following steps:

[0006] Resin powder and carbon nanotube powder are dissolved in a solvent to prepare a mixed resin slurry;

[0007] Fillers are added to rubber, and the mixture is then subjected to internal mixing and open milling. Carbon nanotube powder is added during the open milling process to obtain a mixed rubber.

[0008] The composite fibers are impregnated with a mixed resin slurry, and then the mixed rubber is extruded onto the composite fibers covered with the mixed resin slurry to obtain a fiber prepreg tape.

[0009] The fiber prepreg tape is wound into a friction pad blank, and then hot-pressed and vulcanized in sequence to obtain the friction pad.

[0010] This application incorporates carbon nanotubes into both the resin and the rubber. Carbon nanotubes possess excellent mechanical and thermal conductivity properties. Depending on the type of carbon nanotube, their thermal conductivity ranges from 30 to 1000 W / (m·K). When dispersed in the friction plate, they can enhance the bonding force between the matrix formed by the mixed resin slurry and the mixed rubber and the composite fibers. They can also improve the thermal conductivity of the matrix and the thermal conductivity between the matrix and the composite fibers, thereby improving the thermal conductivity of the friction plate and preventing the clutch friction plate from slipping due to overheating.

[0011] In this application, carbon nanotubes are dispersed in resin and rubber respectively, and then composite fibers are immersed in mixed resin slurry. After that, mixed rubber is extruded onto the composite fibers covered with mixed resin slurry. This dispersion method can improve the dispersion effect of carbon nanotubes.

[0012] This solution improves the thermal conductivity of clutch friction plates by adding carbon nanotubes to the resin and rubber respectively. The solution is simple, easy to implement, and inexpensive, making it suitable for large-scale industrial production.

[0013] In some embodiments, the carbon nanotube powder accounts for 0.1-10 wt.% of the total amount of the resin powder and the carbon nanotube powder.

[0014] In some embodiments, the resin powder includes one or more of phenolic resin powder and epoxy resin powder;

[0015] And / or, the carbon nanotube powder includes one or more of carboxylated carbon nanotube powder and hydroxylated carbon nanotube powder;

[0016] And / or, the solvent includes one or more of methanol and ethanol.

[0017] In some embodiments, the carbon nanotube powder accounts for 0.1-10 wt.% of the total amount of the filler, rubber, and carbon nanotube powder.

[0018] In some embodiments, the rubber includes one or more of styrene-butadiene rubber and nitrile rubber;

[0019] And / or, the filler includes a friction enhancer that increases friction or a friction reducer that decreases friction.

[0020] In some embodiments, the composite fiber includes one or more of aramid fiber, carbon fiber, glass fiber and basalt fiber, as well as copper wire.

[0021] In some embodiments, resin powder and carbon nanotube powder are dissolved in a solvent to prepare a mixed resin slurry, specifically including:

[0022] First, the resin powder and carbon nanotube powder are mechanically mixed to obtain a mixture;

[0023] The mixture is then dissolved in a solvent to prepare a mixed resin slurry.

[0024] In some embodiments, the mixing time of the resin powder and the carbon nanotube powder is 10–300 min.

[0025] In some embodiments, the mixing time of carbon nanotube powder and rubber is 10–60 min.

[0026] Secondly, a heavy-duty truck clutch friction plate is provided, which is prepared by any of the above-described methods for preparing heavy-duty truck clutch friction plates.

[0027] The beneficial effects of the technical solution provided in this application include:

[0028] This application provides a heavy-duty truck clutch friction plate and its preparation method. Carbon nanotubes are added to both the resin and rubber. Carbon nanotubes have good mechanical properties and thermal conductivity. Depending on the type of carbon nanotube, the thermal conductivity is between 30-1000 W / (m·K). When dispersed in the friction plate, it can improve the bonding force between the matrix formed by the mixed resin slurry and the mixed rubber and the composite fiber, and can improve the thermal conductivity of the matrix and the thermal conductivity between the matrix and the composite fiber, thereby improving the thermal conductivity of the friction plate and preventing the clutch friction plate from slipping due to overheating.

[0029] In this application, carbon nanotubes are dispersed in resin and rubber respectively, and then composite fibers are immersed in mixed resin slurry. After that, mixed rubber is extruded onto the composite fibers covered with mixed resin slurry. This dispersion method can improve the dispersion effect of carbon nanotubes.

[0030] This solution improves the thermal conductivity of clutch friction plates by adding carbon nanotubes to the resin and rubber respectively. The solution is simple, easy to implement, and inexpensive, making it suitable for large-scale industrial production.

[0031] In summary, in this application, the upper layer of the composite fiber is a carbon nanotube-modified mixed resin slurry. When the composite fiber is immersed in the slurry, some of the carbon nanotubes will be inserted into the composite fiber due to capillary action, while others will remain in the resin matrix. This increases the thermal conductivity between the resin matrix and the composite fiber, as well as the thermal conductivity of the resin matrix itself. The upper layer of the resin matrix is ​​a carbon nanotube-modified mixed rubber, in which carbon nanotubes are distributed, which also increases the thermal conductivity of the mixed rubber. Thus, the carbon nanotubes improve the overall thermal conductivity of the friction pad. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A flowchart illustrating the preparation method of a heavy-duty truck clutch friction plate provided in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of a heavy-duty truck clutch friction plate provided in an embodiment of this application.

[0035] In the diagram: 1. Composite fiber; 2. Mixed resin slurry; 3. Mixed rubber. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This application provides a method for preparing a friction plate for a heavy-duty truck clutch, which solves the problem that insufficient thermal conductivity in related technologies makes the clutch friction plate prone to "slipping" due to overheating.

[0038] Figure 1 This is a flowchart illustrating the preparation method of the heavy-duty truck clutch friction plate provided in this application embodiment. Figure 2 The diagram shows the friction plate of the heavy-duty truck clutch. In the diagram, 1 represents composite fiber, 2 represents mixed resin slurry, and 3 represents mixed rubber.

[0039] Specifically, the present application provides a method for preparing a friction plate for a heavy-duty truck clutch, which includes the following steps:

[0040] 101: Dissolve resin powder and carbon nanotube powder in a solvent to prepare a mixed resin slurry.

[0041] 102: Add filler to rubber and perform internal mixing and open milling. During the open milling process, carbon nanotube powder is added to obtain mixed rubber.

[0042] 103: Impregnate the composite fibers with a mixed resin slurry, and then extrude the mixed rubber onto the composite fibers covered with the mixed resin slurry to obtain a fiber prepreg tape.

[0043] 104: The fiber prepreg tape is wound into a friction sheet blank, and then hot-pressed and vulcanized in sequence to obtain a friction sheet.

[0044] In this application, carbon nanotube powder is added in steps 101 and 102. Carbon nanotubes have good mechanical properties and thermal conductivity. Depending on the type of carbon nanotube, the thermal conductivity is between 30-1000 W / (m·K). When dispersed in the friction plate, it can improve the bonding force between the matrix formed by the mixed resin slurry and the mixed rubber and the composite fiber, and can improve the thermal conductivity of the matrix and the thermal conductivity between the matrix and the composite fiber, thereby improving the thermal conductivity of the friction plate and preventing the clutch friction plate from slipping due to overheating.

[0045] In this application, carbon nanotubes are dispersed in resin and rubber respectively, and then composite fibers are immersed in mixed resin slurry. After that, mixed rubber is extruded onto the composite fibers covered with mixed resin slurry. This dispersion method can improve the dispersion effect of carbon nanotubes.

[0046] This solution improves the thermal conductivity of clutch friction plates by adding carbon nanotubes to the resin and rubber respectively. The solution is simple, easy to implement, and inexpensive, making it suitable for large-scale industrial production.

[0047] In summary, in this application, the upper layer of the composite fiber is a carbon nanotube-modified mixed resin slurry. When the composite fiber is immersed in the slurry, some of the carbon nanotubes will be inserted into the composite fiber due to capillary action, while others will remain in the resin matrix. This increases the thermal conductivity between the resin matrix and the composite fiber, as well as the thermal conductivity of the resin matrix itself. The upper layer of the resin matrix is ​​a carbon nanotube-modified mixed rubber, in which carbon nanotubes are distributed, which also increases the thermal conductivity of the mixed rubber. Thus, the carbon nanotubes improve the overall thermal conductivity of the friction pad.

[0048] It should be noted that there is no strict order between steps 101 and 102 above. That is to say, the mixed resin slurry can be prepared first and then the mixed rubber can be prepared, or the mixed rubber can be prepared first and then the mixed resin slurry can be prepared, or both can be prepared at the same time.

[0049] In step 101 above, the carbon nanotube powder accounts for 0.1-10 wt.% of the total amount of resin powder and carbon nanotube powder. If the content is too low, the effect on improving thermal conductivity is not obvious; if the content is too high, the carbon nanotubes are not easy to disperse and tend to agglomerate.

[0050] In step 101 above, the resin powder includes one or more of phenolic resin powder and epoxy resin powder.

[0051] In step 101 above, the carbon nanotube powder includes one or more of carboxylated carbon nanotube powder and hydroxylated carbon nanotube powder. Carboxylating or hydroxylating the carbon nanotubes facilitates wetting of the carbon nanotubes and resin matrix, making them easier to disperse.

[0052] In step 101 above, the solvent includes one or more of methanol and ethanol.

[0053] In step 102 above, the carbon nanotube powder accounts for 0.1-10 wt.% of the total amount of the filler, rubber and carbon nanotube powder.

[0054] In step 102 above, the rubber includes one or more of styrene-butadiene rubber and nitrile rubber.

[0055] In step 102 above, the filler includes a friction-increasing agent to increase friction or a friction-reducing agent to decrease friction. The friction-increasing agent includes hard fillers such as diamond and carbon black, while the friction-reducing agent includes one or more of graphite, molybdenum disulfide, and cubic boron nitride.

[0056] In step 103 above, the composite fiber includes one or more of aramid fiber, carbon fiber, glass fiber, and basalt fiber, as well as copper wire. That is to say, the composite fiber is composed of fiber and copper wire.

[0057] In step 101 above, the resin powder and carbon nanotube powder are dissolved in a solvent to prepare a mixed resin slurry. Specifically, this includes: first, mechanically mixing the resin powder and carbon nanotube powder to obtain a mixture; then, dissolving the mixture in a solvent to prepare a mixed resin slurry.

[0058] The mixing time for resin powder and carbon nanotube powder is 10–300 min.

[0059] In step 102 above, the mixing time of carbon nanotube powder and rubber is 10 to 60 minutes.

[0060] In step 104 above, hot pressing into sheets includes: pressing the friction sheet blank into sheets using a hot press at 150-250°C.

[0061] In step 104 above, the vulcanization treatment includes: vulcanization at 180-260°C for 5-20 hours in a sintering furnace.

[0062] This application also provides a heavy-duty truck clutch friction plate, which is prepared using any of the above-described methods for preparing heavy-duty truck clutch friction plates.

[0063] Example 1:

[0064] First, 1 kg of phenolic resin powder and 10 g of carbon nanotube powder are mechanically mixed. Then, the mixture is dissolved in 2 kg of alcohol to prepare a mixed resin slurry. Next, carbon black and diamond filler are added to 1 kg of rubber for intensive and open mixing. During the open mixing process, 10 g of carbon nanotubes are mixed to obtain mixed rubber.

[0065] Finally, 1000 tex composite fibers are impregnated with mixed resin slurry, and then mixed rubber is extruded onto the composite fibers covered with mixed resin slurry to obtain a fiber prepreg tape coated with resin and rubber. The mass ratio of composite fiber to fiber prepreg tape is 1:2. Then, the fiber prepreg tape is wound into a friction sheet blank and pressed into a sheet using a hot press at 200℃. Finally, it is vulcanized in a sintering furnace at 200℃ for 12 hours to obtain a carbon nanotube friction sheet.

[0066] Example 2:

[0067] First, 1 kg of phenolic resin powder and 20 g of carbon nanotube powder are mechanically mixed. Then, the mixture is dissolved in 2 kg of alcohol to prepare a mixed resin slurry. Next, carbon black and diamond filler are added to 1 kg of rubber for intensive and open mixing. During the open mixing process, 10 g of carbon nanotubes are mixed to obtain mixed rubber.

[0068] Finally, 1000 tex composite fibers are impregnated with mixed resin slurry, and then mixed rubber is extruded onto the composite fibers covered with mixed resin slurry to obtain a fiber prepreg tape coated with resin and rubber. The mass ratio of composite fiber to fiber prepreg tape is 1:2. Then, the fiber prepreg tape is wound into a friction sheet blank and pressed into a sheet using a hot press at 200℃. Finally, it is vulcanized in a sintering furnace at 200℃ for 12 hours to obtain a carbon nanotube friction sheet.

[0069] Example 3:

[0070] First, 1 kg of phenolic resin powder and 10 g of carbon nanotube powder are mechanically mixed. Then, the mixture is dissolved in 2 kg of alcohol to prepare a mixed resin slurry. Next, carbon black and diamond filler are added to 1 kg of rubber for intensive and open mixing. During the open mixing process, 20 g of carbon nanotubes are mixed to obtain mixed rubber.

[0071] Finally, 1000 tex composite fibers are impregnated with mixed resin slurry, and then mixed rubber is extruded onto the composite fibers covered with mixed resin slurry to obtain a fiber prepreg tape coated with resin and rubber. The mass ratio of composite fiber to fiber prepreg tape is 1:2. Then, the fiber prepreg tape is wound into a friction sheet blank and pressed into a sheet using a hot press at 200℃. Finally, it is vulcanized in a sintering furnace at 200℃ for 12 hours to obtain a carbon nanotube friction sheet.

[0072] Example 4:

[0073] First, 1 kg of phenolic resin powder and 50 g of carbon nanotube powder are mechanically mixed. Then, the mixture is dissolved in 2 kg of alcohol to prepare a mixed resin slurry. Next, carbon black and diamond filler are added to 1 kg of rubber for intensive and open mixing. During the open mixing process, 50 g of carbon nanotubes are mixed to obtain mixed rubber.

[0074] Finally, 1000 tex composite fibers are impregnated with mixed resin slurry, and then mixed rubber is extruded onto the composite fibers covered with mixed resin slurry to obtain a fiber prepreg tape coated with resin and rubber. The mass ratio of composite fiber to fiber prepreg tape is 1:2. Then, the fiber prepreg tape is wound into a friction sheet blank and pressed into a sheet using a hot press at 200℃. Finally, it is vulcanized in a sintering furnace at 200℃ for 12 hours to obtain a carbon nanotube friction sheet.

[0075] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0076] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method of making a heavy duty truck clutch plate, characterized by, It comprises the following steps: The resin powder and the carbon nanotube powder are dissolved in a solvent to prepare a mixed resin slurry; The filler is added to the rubber, and the rubber is mixed and opened, and the carbon nanotube powder is added again during the opening process to obtain a mixed rubber; The composite fiber is immersed in the mixed resin slurry, and then the mixed rubber is extruded on the composite fiber covered with the mixed resin slurry to obtain a fiber prepreg tape; The fiber prepreg tape is wound into a friction plate blank, and then heat-pressed into a plate, and vulcanized to obtain a friction plate.

2. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The carbon nanotube powder accounts for 0.1-10wt.% of the total amount of the resin powder and the carbon nanotube powder.

3. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The resin powder includes one or more of phenolic resin powder and epoxy resin powder; And / or, the carbon nanotube powder includes one or more of carboxylated carbon nanotube powder and hydroxylated carbon nanotube powder; And / or, the solvent includes one or more of methanol and ethanol.

4. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The carbon nanotube powder accounts for 0.1-10wt.% of the total amount of the filler, rubber and carbon nanotube powder.

5. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The rubber includes one or more of styrene-butadiene rubber and butadiene rubber; And / or, the filler includes a friction-increasing agent or a friction-reducing agent.

6. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The composite fiber includes one or more of aramid fiber, carbon fiber, glass fiber and basalt fiber, and copper wire.

7. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The resin powder and the carbon nanotube powder are dissolved in a solvent to prepare a mixed resin slurry, specifically including: First, the resin powder and the carbon nanotube powder are mechanically mixed to obtain a mixture; Then, the mixture is dissolved in a solvent to prepare a mixed resin slurry.

8. The preparation method of the heavy truck clutch friction plate according to claim 7, wherein: The mixing time of the resin powder and the carbon nanotube powder is 10-300min.

9. The preparation method of the heavy truck clutch friction plate according to claim 1, wherein: The opening time of the carbon nanotube powder and the rubber is 10-60min.

10. A heavy duty truck clutch plate characterized by: The heavy truck clutch friction plate is prepared by the preparation method of the heavy truck clutch friction plate according to any one of claims 1 to 9.

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