CN116199999A - Viscoelastic resin-based friction material and preparation method thereof - Google Patents
Viscoelastic resin-based friction material and preparation method thereof Download PDFInfo
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention relates to a viscoelastic resin-based friction material and a preparation method thereof. The polyurethane modified resin-based friction material fully plays the characteristics of viscosity and elasticity of the viscoelastic material, inhibits vibration and noise generated in the friction process, reduces urban traffic noise pollution, has good mechanical property and tribological property, improves the stability of a friction contact interface, reduces the excited vibration level, and has high and stable friction coefficient.
Description
Technical Field
The invention belongs to the technical field of dry friction materials, and relates to a viscoelastic resin-based friction material and a preparation method thereof.
Background
The resin-based friction material is a ternary polymer composite material formed by fully and uniformly mixing a resin binder, a fiber reinforcement, a filler and the like and then performing hot press molding, and the resin-based friction material utilizes friction force to transfer torque or absorb braking energy in the working process and has stable friction coefficient and wear resistance. The resin-based friction material has the characteristics of low production cost, long service life, strong designability, no spark during friction and the like, and is widely applied to the fields of rail transit, aerospace, automobiles, engineering machinery and the like as a braking or transmission material.
Railway transportation is one of the main transportation modes, and humps play an irreplaceable role in the transit-disintegration-grouping process of freight trains. The hump is a hillside building on the ground like Luo Tuofeng back, is designed into a proper gradient, is paved with railways, and is a main method for disassembling the train by utilizing the gravity of the train and potential energy generated by the gradient of the hump and assisting with the thrust of the locomotive. With the continuous expansion of urban areas in China, the periphery of a hump of a marshalling station is gradually surrounded by residential areas, steel rails are generally adopted as braking friction materials in the current speed reducers, and the dry friction of two metal materials of a braking rail and a vehicle is extremely easy to generate high-frequency high-sound pressure level braking screaming noise, so that the physical and psychological health of a human body is seriously endangered, and even noise deafness and other diseases are caused. The resin matrix composite material mainly depends on the viscoelasticity of the polymer, has more outstanding damping performance than metal, and has remarkable advantages in the aspects of vibration and noise control. The carbon fiber has the characteristics of high strength, small specific gravity, friction resistance and the like, so that the friction material can be applied to service environments with higher requirements. Therefore, development of a high performance resin-based friction material having good mechanical properties, friction properties, and also having a low vibration noise level is an important point of research in this field.
Based on literature studies, the following two methods are mainly adopted for reducing friction vibration noise in general: firstly, the content of the metal component is reduced, and secondly, the porous sound absorption component is added, but both methods have difficulty in combining various properties of the friction material. The polymer has the characteristics of viscosity and elasticity, the energy of the viscous part is converted and dissipated due to the internal consumption, the mechanical energy of the elastic part is stored, the control of broadband random vibration and noise can be realized by depending on the viscoelasticity of the resin matrix, and the effects of vibration reduction and noise reduction are achieved. Therefore, starting from the modification of the matrix of the resin-based friction material, the vibration and noise reduction effects of the viscoelastic polymer matrix are fully exerted, the viscoelasticity is improved, the damping performance is improved, and the friction material has good mechanical performance and tribological performance.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides the viscoelastic resin-based friction material and the preparation method thereof, and the composite material has great freedom in structural design and performance improvement due to the advantage of strong designability, and the matrix is taken as an important component for forming the composite material, so that the performance of the material is greatly influenced. By blending and modifying the polymer matrix, the high-performance resin-based friction material with good mechanical property, tribological property and low vibration noise level can be obtained.
Technical proposal
A viscoelastic resin-based friction material is characterized by comprising the following raw materials in parts by weight: 15-18% of polyacrylonitrile carbon fiber; 1-4% of Kevlar fiber, 1-3% of mineral fiber, 15-20% of phenolic resin, 8-12% of rubber, 45-55% of filler and 3-6% of polyurethane micropowder; wherein the sum of the weight ratio of the components is 100 percent.
The polyurethane micro powder is polyether type thermoplastic polyurethane elastomer with the specific gravity of 1.11g/cm 3 The Shore hardness is 80, the Shore A is 80, and the grain diameter of the micro powder is 20-80 mu m.
The polyacrylonitrile carbon fiber is a chopped carbon fiber with the length of 80-100 mu m.
The rubber comprises one or more of nitrile rubber, styrene-butadiene rubber, fluororubber and black rubber powder.
The filler includes, but is not limited to, one or more of aluminum oxide, barium sulfate, zinc oxide, fluorite powder, mineral powder, mica powder, carbon black, calcium carbonate, diatomaceous earth, chromite.
A method of preparing the viscoelastic resin-based friction material characterized by the steps of:
adding 15-20% of phenolic resin, 8-12% of rubber, 50-55% of filler and 3-6% of polyurethane micro powder I into the mixed fiber, and fully mixing by a high-speed mixer;
step 4, heat treatment: and (3) putting the pressed preformed body into an oven, performing heat treatment, cooling to room temperature, and performing mechanical processing to prepare the viscoelastic resin-based friction material.
The dehydration treatment in the step 1 is as follows: firstly, drying for 8-12 h at 45-55 ℃, and then drying for 3-5 h at 45-55 ℃ and vacuum degree of 1000-5000 Pa.
The rotating speed of the high-speed mixer in the step 1 is 8000-10000 rpm, the stirring time is 10-15 s, and the mixer is kept stand for 15-20 min.
The mixing process in the step 2 adopts a plurality of short-time stirring and standing.
The temperature system of the heat treatment in the step 4 is as follows: heating to 115-125 ℃, heating for 15-25 min, and preserving heat for 60-70 min; heating to 135-145 ℃, heating for 5-15 min, and preserving heat for 60-70 min; heating to 155-165 ℃, heating for 5-15 min, and preserving heat for 170-190 min; heating to 175-185 deg.c for 5-15 min and maintaining for 40-60 min.
Advantageous effects
According to the viscoelastic resin-based friction material and the preparation method thereof, polyurethane pretreatment and raw material components are mixed, and the viscoelastic resin-based friction material is obtained through mold filling, hot press solidification, heat treatment and machining. The polyurethane modified resin-based friction material fully plays the characteristics of viscosity and elasticity of the viscoelastic material, inhibits vibration and noise generated in the friction process, reduces urban traffic noise pollution, has good mechanical property and tribological property, improves the stability of a friction contact interface, reduces the excited vibration level, and has high and stable friction coefficient.
According to the invention, polyacrylonitrile carbon fiber, kevlar fiber and mineral fiber are added as reinforcements, so that the damping performance of the composite material can be improved by mixing the fibers on the basis of ensuring the enough bearing capacity of the friction material, and the vibration absorption capacity of the friction material is enhanced. The rubber is a high molecular polymer with large reversible deformation, and the addition of the friction material improves the damping performance of the composite material, thereby being beneficial to weakening friction vibration and reducing braking noise. The key point of the invention is that the damping loss factor of the material is further improved by a blending modification mode based on the self viscoelasticity of the resin matrix. The polyurethane is a polymer which consists of soft and hard blocks and contains a large number of carbamate (-NHCOO-) structural units in a molecular main chain, the modulus of the polymer is between that of plastic and rubber, and the polymer has a large number of hydrogen bonds and a micro-phase separation structure to a certain extent, so that the polymer has higher damping loss factor, and has better mechanical strength, toughness and wear resistance. Therefore, polyurethane with certain compatibility with phenolic resin but different glass transition temperature is adopted to blend with the phenolic resin, and the characteristics of different glass transition regions of the polyurethane and the phenolic resin are utilized to improve the damping performance of the material, absorb mechanical vibration and acoustic vibration energy and reduce vibration and noise generated in the friction braking process. In addition, polyurethane can also be used as a binder, and other raw material components are bonded into a whole under the synergistic effect of the polyurethane and phenolic resin, so that the surface of the friction material is smoother, a continuous friction film with large area is formed in the friction process, and vibration of a friction pair excited under continuous alternating stress is inhibited.
The viscoelastic resin-based friction material prepared by the invention has the characteristics of viscosity and elasticity, on one hand, the damping loss factor of the friction material after polyurethane modification is improved by 23.26-75.04%, the dissipation effect of vibration energy is enhanced, the vibration and noise level in the friction process is inhibited, the vibration level is reduced by 8.58-53.22%, and the equivalent sound pressure level is reduced by 3.22-6.00 dB; on the other hand, the permanent deformation resistance and the recovery capacity of the friction material after polyurethane modification are improved, the compression ratio of the friction material is reduced by 40.00-62.35%, the rebound rate is improved by 12.28-22.24%, the actual contact area between the friction material and the dual material in the friction braking process can be increased by good elasticity, the mechanical engagement effect is enhanced, the friction coefficient is improved by 3.75-11%, meanwhile, the friction material and the dual material always maintain a stable contact state in the friction braking process, the formation of a large-area friction film is promoted, the stability of the friction coefficient is improved by 26.76-29.10%, and fatigue wear is relieved.
Drawings
FIG. 1 is a graph of loss factors at different frequencies for a comparative example and a different example;
FIG. 2 is a graph of compression resilience performance for the comparative example and the different examples;
FIG. 3 is a graph of the microscopic surface topography after grinding for the comparative and different examples.
Detailed Description
The invention will now be further described with reference to examples, figures:
the invention will now be further described with reference to examples, figures. The following examples will assist those skilled in the art in further understanding the present invention, but are merely preferred embodiments of the present invention. It will be apparent to those skilled in the art that several variations and modifications can be made to the obtained embodiment without departing from the spirit of the invention, and these are all within the scope of the invention.
Example 1
Step 1: dehydrating the polyurethane micro powder in a baking oven at 45 ℃ for 12 hours to obtain fully dried polyurethane micro powder I;
step 2: adding 18% of polyacrylonitrile carbon fibers, 1% of Kevlar fibers and 1% of mineral fibers into a high-speed mixer according to mass percentage, mixing, stirring for 10s at the rotating speed of 10000rpm, and standing for 20min;
step 3: adding 15% of phenolic resin, 10% of rubber, 52% of filler and 3% of polyurethane micro powder I into the mixed fiber according to the mass percentage, fully mixing by a high-speed mixer, stirring for 4 times for 3s by adopting a plurality of times and standing for 10min at a speed of 10000rpm to obtain mixed powder; the added rubber comprises nitrile rubber and black rubber powder; the filler comprises aluminum oxide, calcium carbonate, chromite, diatomite, fluorite powder and carbon black;
step 4: the mass of the mixed powder is calculated according to the volume of the mould and the density of the friction material, and the density of the friction material is 2.0g/cm 3 Then adding the mixed powder into a mould for hot pressing and curing, and pressing for 900s at 170 ℃ and 5MPa to obtain a friction material preformed body, wherein the air is discharged once every 50s in the pressing process;
step 5: placing the pressed preformed body into an oven for heat treatment, heating to 115 ℃, heating for 15min, and keeping the temperature for 70min; heating to 145 ℃, heating for 15min, and preserving heat for 60min; heating to 155 ℃, heating for 5min, and preserving heat for 190min; heating to 185 ℃, heating for 15min, and preserving heat for 40min; and cooling to room temperature, and finally performing mechanical cutting and surface polishing to obtain the viscoelastic resin-based friction material.
Example 2
Step 1: dehydrating the polyurethane micro powder in a vacuum drying oven at a drying temperature of 55 ℃ and a vacuum degree of 1000Pa for 3 hours to obtain fully dried polyurethane micro powder I;
step 2: adding 15% of polyacrylonitrile carbon fibers, 4% of Kevlar fibers and 1% of mineral fibers into a high-speed mixer according to the mass percentage, mixing, stirring for 15s at the rotating speed of 8000rpm, and standing for 15min;
step 3: adding 20% of phenolic resin, 8% of rubber, 47.5% of filler and 4.5% of polyurethane micro powder I into the mixed fiber according to the mass percentage, fully mixing by a high-speed mixer, wherein the rotating speed of the high-speed mixer is 8000rpm, stirring for a plurality of times in a short time, standing for 5 seconds, and standing for 5 minutes each time to obtain mixed powder; the rubber added includes fluororubber; the added filler comprises barium sulfate, calcium carbonate, mineral powder, mica powder and carbon black;
step 4: the mass of the mixed powder is calculated according to the volume of the mould and the density of the friction material, and the density of the friction material is 2.0g/cm 3 Then adding the mixed powder into a mould for hot pressing and curing, and pressing for 1200s at 150 ℃ and 5MPa to obtain a friction material preformed body, wherein the air is discharged once every 50s in the pressing process;
step 5: placing the pressed preformed body into an oven for heat treatment, heating to 125 ℃, heating for 25min, and keeping the temperature for 60min; heating to 135 ℃, heating for 5min, and keeping the temperature for 70min; heating to 165 ℃, heating for 15min, and keeping the temperature for 170min; heating to 175 ℃, heating for 5min, and preserving heat for 60min; and cooling to room temperature, and finally performing mechanical cutting and surface polishing to obtain the viscoelastic resin-based friction material.
Example 3
Step 1: dehydrating the polyurethane micro powder in a vacuum drying oven at 45 ℃ and 5000Pa for 5 hours to obtain fully dried polyurethane micro powder I;
step 2: adding 15% of polyacrylonitrile carbon fibers, 2% of Kevlar fibers and 3% of mineral fibers into a high-speed mixer according to mass percentage, mixing, wherein the rotating speed of the high-speed mixer is 9000rpm, stirring time is 12s, and standing for 17min;
step 3: adding 17% of phenolic resin, 12% of rubber, 45% of filler and 6% of polyurethane micro powder I into the mixed fiber according to the mass percentage, fully mixing by a high-speed mixer, wherein the rotating speed of the high-speed mixer is 9000rpm, stirring for a plurality of times in a short time, standing for 4s for 8 times, and standing for 7min each time to obtain mixed powder; the added rubber comprises butadiene rubber and black rubber powder; the added filler comprises zinc oxide, calcium carbonate, fluorite powder, mica powder, diatomite and carbon black;
step 4: the mass of the mixed powder is calculated according to the volume of the mould and the density of the friction material, and the density of the friction material is 2.0g/cm 3 Then adding the mixed powder into a mould for hot pressing and curing, and pressing for 600s at 170 ℃ and 10MPa to obtain a friction material preformed body, wherein the air is discharged once every 50s in the pressing process;
step 5: placing the pressed preformed body into an oven for heat treatment, heating to 120 ℃, heating for 20min, and keeping the temperature for 65min; heating to 140 ℃, heating for 10min, and preserving heat for 65min; heating to 160 ℃, heating for 10min, and preserving heat for 180min; heating to 180 ℃, heating for 10min, and keeping the temperature for 50min; and cooling to room temperature, and finally performing mechanical cutting and surface polishing to obtain the viscoelastic resin-based friction material.
Comparative example:
the key point of the raw material components of the viscoelastic resin-based friction material prepared by the invention is polyurethane micro powder, so that the comparative example does not contain polyurethane micro powder and does not relate to the polyurethane micro powder treatment step;
step 1: adding 16% of polyacrylonitrile carbon fibers, 2% of Kevlar fibers and 2% of mineral fibers into a high-speed mixer according to mass percentage, mixing, wherein the rotating speed of the high-speed mixer is 9000rpm, stirring time is 12s, and standing for 17min;
step 2: adding 15% of phenolic resin, 10% of rubber and 55% of filler into the mixed fiber according to the mass percentage, fully mixing by a high-speed mixer, stirring for 3 times for 3s by adopting short-time stirring for 5min at a speed of 10000rpm, and obtaining mixed powder; the added rubber comprises nitrile rubber; the added filler comprises aluminum oxide, calcium carbonate, zinc oxide, diatomite, mica powder and carbon black;
step 3: the mass of the mixed powder is calculated according to the volume of the mould and the density of the friction material, and the density of the friction material is 2.0g/cm 3 Then adding the mixed powder into a mould for hot pressing and curing, and pressing for 900s at 170 ℃ and 5MPa to obtain a friction material preform, wherein one air bleed is carried out every 50s in the pressing processSecondary times;
step 5: placing the pressed preformed body into an oven for heat treatment, heating to 115 ℃, heating for 15min, and keeping the temperature for 70min; heating to 135 ℃, heating for 10min, and keeping the temperature for 70min; heating to 155 ℃, heating for 10min, and preserving heat for 190min; heating to 185 ℃, heating for 15min, and preserving heat for 40min; and cooling to room temperature, and finally performing mechanical cutting and surface polishing to obtain the viscoelastic resin-based friction material.
To verify the effect of the present invention, the friction materials prepared in examples were compared with each performance of comparative examples through damping performance, compression set elastic performance and friction performance tests, and vibration and noise levels generated during friction were tested in real time using an acceleration sensor and a sound pressure sensor.
Fig. 1 shows the loss factors for different samples at different frequencies. Damping loss factor is a main index for evaluating dissipation characteristics, and represents the capability of the viscoelastic material to dissipate vibration energy, and the larger the loss factor is, the more remarkable the dissipation effect on energy is. From the results, the viscoelastic resin-based friction material prepared by the invention has higher damping loss factor, and the higher the polyurethane content is, the higher the loss factor is, the stronger the shock absorbing capability is, and the damping loss factor is favorable for inhibiting vibration and noise level in the friction process.
Table 1 shows the compression and rebound of the different samples. Resistance to compressive deformation is a very important property of resin-based friction materials. As can be seen from the results in the table, the viscoelastic resin-based friction material prepared by the invention has good elasticity, the compression ratio is reduced, the rebound ratio is improved, the compression ratio is reduced by 62.35% at the highest, the rebound ratio is increased by 22.24% at the highest, and the elasticity is beneficial to improving the permanent deformation resistance and the recovery capability of the friction material and is also beneficial to improving the tribological property. FIG. 2 is a graph of the compression resilience performance of different samples. From the stress-strain curve, it can be seen that the viscoelastic resin-based friction material prepared according to the present invention exhibits a smaller degree of deformation under the same main load, while exhibiting a greater degree of recovery after unloading.
Table 1 compression and rebound of different samples
| Sample of | Compression ratio (%) | Compression rate decrease (%) | Rebound Rate (%) | Rebound Rate improvement (%) |
| Comparative example | 0.85 | \ | 68.48 | \ |
| Example 1 | 0.51 | 40.00 | 83.71 | 22.24 |
| Example 2 | 0.32 | 62.35 | 76.89 | 12.28 |
| Example 3 | 0.39 | 54.12 | 78.40 | 14.49 |
Table 2 shows the dynamic friction coefficients of the different samples. In a proper range, the high and stable friction coefficient is favorable for improving the braking efficiency, and the stable friction coefficient is favorable for the stable contact of the friction pair, thereby having positive effects on vibration reduction and noise reduction. The results in the table show that the viscoelastic resin-based friction material prepared by the invention has higher friction coefficient, the stability of the friction coefficient is improved, the friction coefficient is improved by 11% at the maximum, and the stability of the friction coefficient is improved by 29.10% at the maximum. The polyurethane which is uniformly distributed improves the elasticity of the friction material, the actual contact area between the friction material and the dual material is increased in the friction braking process of the friction material, the mechanical engagement effect is increased, and the friction coefficient is increased; meanwhile, polyurethane and phenolic resin cooperatively play a role in adhesion, so that the surface of the friction material is smoother, and the stability of the friction coefficient is improved. FIG. 3 is a graph of the microscopic surface topography of different samples after grinding. There are significant holes, swarf and cracks on the wear surface in the comparative example, due to the greater brittleness of the comparative example, while the presence of surface defects is detrimental to the formation of a continuous tribofilm. The wear surface defects of the viscoelastic resin-based friction material prepared by the invention are obviously reduced, fatigue wear is effectively relieved, a more continuous friction film is formed, the stability of the friction coefficient is improved, and the contact interface state with the dual material in the friction braking process after polyurethane modification is more stable.
TABLE 2 coefficient of dynamic friction for different samples
| Comparative example | Example 1 | Example 2 | Example 3 | |
| Coefficient of friction | 0.400 | 0.415 | 0.429 | 0.444 |
| Coefficient of variation | 8.11％ | 5.75％ | 5.94％ | 5.90％ |
Table 3 shows the vibration and noise levels for the different samples. The brake friction noise is generated by vibration of components such as a brake due to friction of a brake pair during braking. As can be seen from the results in the table, the vibration and noise levels in the friction process of the viscoelastic resin-based friction material prepared by the invention are improved, the vibration level is reduced by 53.22% at the highest, and the equivalent sound pressure level is reduced by 6.00dB at the highest. The reason for this is: on one hand, the friction material after polyurethane modification better plays a role of viscosity to improve the loss factor and enhance the capability of absorbing vibration and sound vibration; on the other hand, the friction material modified by polyurethane has good elasticity, and the friction material and the dual material always keep a stable contact state in the friction braking process, thereby being beneficial to forming a large-area friction film and inhibiting vibration of a friction pair under continuous alternating stress.
TABLE 3 vibration and noise levels for different samples
| Sample of | Average amplitude of acceleration (m/s) 2 ) | Amplitude reduction (%) | Friction equivalent sound level (dB) |
| Comparative example | 2.33 | \ | 71.58 |
| Example 1 | 2.13 | 8.58 | 68.36 |
| Example 2 | 1.09 | 53.22 | 65.58 |
| Example 3 | 1.81 | 22.32 | 67.89 |
Claims (10)
1. A viscoelastic resin-based friction material is characterized by comprising the following raw materials in parts by weight: 15-18% of polyacrylonitrile carbon fiber; 1-4% of Kevlar fiber, 1-3% of mineral fiber, 15-20% of phenolic resin, 8-12% of rubber, 45-55% of filler and 3-6% of polyurethane micropowder; wherein the sum of the weight ratio of the components is 100 percent.
2. A viscoelastic resin based friction material as set forth in claim 1 wherein: the polyurethane micro powder is polyether type thermoplastic polyurethane elastomer with the specific gravity of 1.11g/cm 3 The Shore hardness is 80, the Shore A is 80, and the grain diameter of the micro powder is 20-80 mu m.
3. A viscoelastic resin based friction material as set forth in claim 1 wherein: the polyacrylonitrile carbon fiber is a chopped carbon fiber with the length of 80-100 mu m.
4. A viscoelastic resin based friction material as set forth in claim 1 wherein: the rubber comprises one or more of nitrile rubber, styrene-butadiene rubber, fluororubber and black rubber powder.
5. A viscoelastic resin based friction material as set forth in claim 1 wherein: the filler includes, but is not limited to, one or more of aluminum oxide, barium sulfate, zinc oxide, fluorite powder, mineral powder, mica powder, carbon black, calcium carbonate, diatomaceous earth, chromite.
6. A method for preparing a viscoelastic resin based friction material as set forth in any one of claims 1 to 7, characterized by the steps of:
step 1, pretreatment of polyurethane micro powder: dehydrating the polyurethane micro powder to obtain fully dried polyurethane micro powder;
step 2, preparing mixed powder: 15 to 18 percent of polyacrylonitrile carbon fiber, 1 to 4 percent of Kevlar fiber and 1 to 3 percent of mineral fiber are added into a high-speed mixer for mixing;
adding 15-20% of phenolic resin, 8-12% of rubber, 50-55% of filler and 3-6% of polyurethane micro powder I into the mixed fiber, and fully mixing by a high-speed mixer;
step 3, hot pressing and curing: adding the mixed powder into a mould, and carrying out hot pressing and curing treatment to obtain a preformed body, wherein the treatment temperature is 150-170 ℃, the pressure is 5-10 MPa, the time is 600-1200 s, and the air is discharged every 50s in the pressing process;
step 4, heat treatment: and (3) putting the pressed preformed body into an oven, performing heat treatment, cooling to room temperature, and performing mechanical processing to prepare the viscoelastic resin-based friction material.
7. The method according to claim 6, wherein: the dehydration treatment in the step 1 is as follows: firstly, drying for 8-12 h at 45-55 ℃, and then drying for 3-5 h at 45-55 ℃ and vacuum degree of 1000-5000 Pa.
8. The method according to claim 6, wherein: the rotating speed of the high-speed mixer in the step 1 is 8000-10000 rpm, the stirring time is 10-15 s, and the mixer is kept stand for 15-20 min.
9. The method according to claim 6, wherein: the mixing process in the step 2 adopts a plurality of short-time stirring and standing.
10. The method according to claim 6, wherein: the temperature system of the heat treatment in the step 4 is as follows: heating to 115-125 ℃, heating for 15-25 min, and preserving heat for 60-70 min; heating to 135-145 ℃, heating for 5-15 min, and preserving heat for 60-70 min; heating to 155-165 ℃, heating for 5-15 min, and preserving heat for 170-190 min; heating to 175-185 deg.c for 5-15 min and maintaining for 40-60 min.
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| CN107559357A (en) * | 2017-07-31 | 2018-01-09 | 山东金麒麟股份有限公司 | A kind of friction material and purposes for elevator brake block |
| CN113201202A (en) * | 2021-06-17 | 2021-08-03 | 西北工业大学 | High-damping resin-based friction material and preparation method thereof |
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| CN107559357A (en) * | 2017-07-31 | 2018-01-09 | 山东金麒麟股份有限公司 | A kind of friction material and purposes for elevator brake block |
| CN113201202A (en) * | 2021-06-17 | 2021-08-03 | 西北工业大学 | High-damping resin-based friction material and preparation method thereof |
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