CN110219917B - Brake pad of clutch containing neodymium iron boron powder and its manufacturing method - Google Patents
Brake pad of clutch containing neodymium iron boron powder and its manufacturing method Download PDFInfo
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- CN110219917B CN110219917B CN201910454318.XA CN201910454318A CN110219917B CN 110219917 B CN110219917 B CN 110219917B CN 201910454318 A CN201910454318 A CN 201910454318A CN 110219917 B CN110219917 B CN 110219917B
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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
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/18—Homopolymers or copolymers of nitriles
- C08L33/20—Homopolymers or copolymers of acrylonitrile
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- 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
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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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
-
- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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
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- 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
- F16D2200/00—Materials; Production methods therefor
Abstract
The invention relates to a brake pad of a clutch containing neodymium iron boron powder and a manufacturing method thereof. The material is processed by the following raw materials by weight: 12-16 parts of acrylic pulp, 5-8 parts of potassium hexatitanate whisker, 10-14 parts of sepiolite fiber, 8-10 parts of phenolic resin, 4-6 parts of ultrafine wollastonite, 6-10 parts of potassium feldspar powder, 8-14 parts of sodium iron titanate platelet, 8-12 parts of elastic wear-resistant particles, 3-6 parts of hydrothermal modified crystalline flake graphite, 4-6 parts of kieselguhr, 4-6 parts of micron-sized Ru-Fe-B powder, 0.5-1.2 parts of nano ferroferric oxide, 0.5-1.5 parts of stearic acid, 0.8-1.2 parts of an anti-aging agent and 1.5-2.5 parts of a curing agent. The invention has the advantages of large braking torque, stable friction performance, good high-temperature wear resistance, good impact strength and shear strength and the like, can meet the requirements of high-speed and heavy-load use working conditions of the port hoister, and improves the safety of the operation of the hoister.
Description
Technical Field
The invention relates to a brake pad and a manufacturing method thereof, in particular to a clutch brake pad containing neodymium iron boron powder and a manufacturing method thereof.
Background
The bucket elevator can lift the granular materials to a high position from a low position vertically or at a certain inclination angle, the hopper is filled with the materials at the low position, and the materials are lifted to the top along with the conveying belt, so that the bucket elevator has large conveying capacity (up to 800 m)3The lifting height is large (up to 100 m), the energy consumption is low, the running economy is good, the sealing performance is good, dust is not easy to generate, and the like, and the lifting device is widely used for loading, unloading and conveying bulk goods such as coal, ore and the like in ports and docks. The bucket elevator draws the material of the conveyer belt in case of power failure or fault in the operation processThe lifting side can lead to the reverse rotation of the head wheel and the traction conveying belt due to the gravity action of the materials loaded in the winnowing pan, the materials are poured back to the feeding base, the material blocking condition or the damage of the conveying belt and the winnowing pan occurs, and the major economic loss and even the personal safety accident are caused.
The friction clutch brake is a core functional component of the bucket elevator and is used for transmitting clutch torque and performing parking brake. When power is cut off suddenly, the brake pad is pushed to press the brake disc by the acting force of the belleville spring, and braking is realized by friction torque. With the gradual increase of the rated lifting capacity and the continuous increase of the lifting speed of a lifter, the conventional friction brake pad cannot completely adapt to complex working conditions such as high speed, heavy load and the like, and the phenomena of friction failure such as serious heat fading, small friction coefficient, large wear rate and the like often occur during braking.
Disclosure of Invention
The invention aims to overcome the defects of serious heat fading, small friction coefficient, high wear rate and the like frequently occurring in the braking process of the clutch brake pad in the prior art, and provides a clutch brake pad containing neodymium iron boron powder. The clutch brake pad has the advantages of large friction coefficient, quick heat conduction and dissipation and low wear rate.
The invention also aims to provide a method for manufacturing the clutch brake pad containing neodymium iron boron powder.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a clutch brake pad containing neodymium iron boron powder is processed from the following raw materials in parts by weight:
12-16 parts of acrylic pulp, 5-8 parts of potassium hexatitanate whisker, 10-14 parts of sepiolite fiber, 8-10 parts of phenolic resin, 4-6 parts of ultrafine wollastonite, 6-10 parts of potassium feldspar powder, 8-14 parts of sodium iron titanate platelet, 8-12 parts of elastic wear-resistant particles, 3-6 parts of hydrothermal modified crystalline flake graphite, 4-6 parts of kieselguhr, 4-6 parts of micron-sized Ru-Fe-B powder, 0.5-1.2 parts of nano ferroferric oxide, 0.5-1.5 parts of stearic acid, 0.8-1.2 parts of an anti-aging agent and 1.5-2.5 parts of a curing agent.
In the invention, the scale graphite is subjected to hydrothermal modification treatment, and the specific treatment method comprises the following steps:
(1) adding a certain amount of Na2MoO4·2H2Adding O and L-cysteine into deionized water, stirring to obtain uniform mixed solution, and adding Na in the mixed solution2MoO4The amount of the substance of L-cysteine is Na in a ratio of 1:6 to the amount of the substance of deionized water2MoO43 times the sum of the amounts of substances of (a);
(2) ultrasonically dispersing crystalline flake graphite powder in deionized water to obtain a suspension, dropwise adding the crystalline flake graphite powder suspension into the mixed solution, and continuously stirring for 1-1.5h, wherein the amount of the crystalline flake graphite powder is equal to Na calculated according to the amount of carbon substances2MoO41.5-1.8 times the amount of the substance(s);
(3) transferring the reaction mixture obtained in the step (2) into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, sealing, reacting at 260 ℃ for 12-18h, naturally cooling to room temperature, centrifugally separating a precipitate obtained in the hydrothermal reaction, fully washing with deionized water, and finally drying in vacuum at 60-70 ℃ for 8-10h to obtain the crystalline flake graphite (MoS) subjected to hydrothermal modification treatment2Flake graphite composite).
The flake graphite is similar to fish phosphorus in shape, belongs to a hexagonal crystal system, is in a layered structure, and has good performances of high temperature resistance, electric conduction, heat conduction, lubrication, plasticity, acid and alkali resistance and the like. The inventor of the application finds that after hydrothermal modification treatment, on one hand, the dispersibility of the modified brake pad is greatly improved, and in addition, the compatibility of the modified brake pad with other components is also greatly improved, the heat-conducting property of the brake pad can be effectively improved by improving the dispersibility and the compatibility, the brake pad is prevented from being damaged due to high local temperature in the braking process, and the service life of the brake pad is greatly prolonged.
Preferably, the food is processed by the following raw materials in parts by weight: 14 parts of acrylic pulp, 6 parts of potassium hexatitanate whisker, 12 parts of sepiolite fiber, 18 parts of phenolic resin, 5 parts of superfine wollastonite, 8 parts of potassium feldspar powder, 12 parts of sodium iron titanate platelet, 10 parts of elastic wear-resistant particles, 4 parts of hydrothermal modified crystalline flake graphite, 5 parts of kieselguhr, 5 parts of micron-sized Ru iron boron powder, 1 part of nano ferroferric oxide, 1 part of stearic acid, 1 part of an anti-aging agent and 2 parts of a curing agent.
Preferably, the nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH 570.
A preparation method of a clutch brake pad containing neodymium iron boron powder comprises the following steps:
step S1: pouring the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin into a plow-rake type mixer according to the formula ratio, wherein the mixing time is 10-15min, and the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin are uniformly dispersed;
step S2: adding the phenolic resin modified by the nano ferroferric oxide and the flake graphite in the step S1, reinforcing fiber, potassium hexatitanate whisker, sepiolite fiber, superfine wollastonite, potassium feldspar powder, sodium iron titanate lamella, diatomite, micron-sized Ru iron boron powder, stearic acid, an anti-aging agent, a curing agent and elastic wear-resistant particles into a rake mixer according to a formula ratio;
step S3: heating a hot-press forming machine mould to 120-;
step S4: and (3) putting the hot-pressed product into a constant-temperature drying box, carrying out heat treatment for 2-3 h in a constant-temperature box with the temperature of 200-210 ℃, fully curing, and finally magnetizing in a magnetizing machine.
Preferably, in step S2, in order to ensure the mixing uniformity, the mixing is performed twice, the mixing time is 25min each time, the material after the first mixing is taken out and put into the mixer again for the second mixing, and the mixing time is 50min in total.
The invention takes acrylic fiber pulp, potassium hexatitanate whisker and sepiolite fiber mixed as a reinforcement, nano ferroferric oxide modified and elastic friction particle blended modified phenolic resin as a binder, and micron neodymium-iron-boron powder with excellent magnetic property as a friction regulator to prepare the friction material layer of the clutch brake pad of the bucket elevator.
Wherein:
1. three fibers of the acrylic pulp, the potassium hexatitanate whisker and the sepiolite fiber are wound and overlapped to form a plurality of levels of random crossing network structures. The structure enables the advantages of the fibers to be complementary, can obviously improve the mechanical property of the friction material, simultaneously generates a constraint effect on the expansion of cracks by the cross network structure, prevents deformation dislocation of a matrix and the movement of molecular chains, and enhances the toughness and the shock resistance of the friction material.
2. Micron neodymium-iron-boron powder with excellent magnetic property is added into the formula of the phenolic resin as a friction regulator, and nano ferroferric oxide nano modified phenolic resin is added, wherein the adding ratio of Ru iron boron to nano ferroferric oxide is 14:3, which is most reasonable.
3. The magnetic field that the combined action of neodymium iron boron granule and nanometer ferroferric oxide produced can promote the formation of friction film, the friction medium (neodymium iron boron granule, dual disc metal particle) that the friction process produced is adsorbed on the friction material surface under the magnetic induction intensity effect, coefficient of friction has relatively been increased at high temperature friction in-process, coefficient of friction's stability has been kept, the magnetic induction intensity of self has increased the adhesive force of film to a certain extent in addition, the destructive process of film has been slowed down, thereby the wear rate has been reduced greatly.
The nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH570 so as to improve the compatibility with phenolic resin.
The phenolic resin is modified: firstly, the nano ferroferric oxide subjected to surface modification is adopted to modify the phenolic resin in a nano mode, so that the heat fading resistance and the abrasion resistance of the phenolic resin can be remarkably improved: and secondly, blending, toughening and modifying the phenolic resin by adopting autonomous high-pressure retraction elastic friction particles. The friction particles are patented (ZL 201310343625.3), and the heat resistance and the impact strength of the phenolic resin can be further improved, so that the friction coefficient stability and the wear resistance of the friction material are improved;
the flake graphite is similar to fish phosphorus in shape, belongs to a hexagonal crystal system, is in a layered structure, and has good performances of high temperature resistance, electric conduction, heat conduction, lubrication, plasticity, acid and alkali resistance and the like. The inventor of the application finds that after hydrothermal modification treatment, on one hand, the dispersibility of the modified brake pad is greatly improved, and in addition, the compatibility of the modified brake pad with other components is also greatly improved, the heat-conducting property of the brake pad can be effectively improved by improving the dispersibility and the compatibility, the brake pad is prevented from being damaged due to high local temperature in the braking process, and the service life of the brake pad is greatly prolonged.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following specific examples.
Example 1
A clutch brake pad containing neodymium iron boron powder is processed from the following raw materials in parts by weight:
12 parts of acrylic pulp, 5 parts of potassium hexatitanate whisker, 10 parts of sepiolite fiber, 8 parts of phenolic resin, 4 parts of superfine wollastonite, 6 parts of potassium feldspar powder, 8 parts of sodium iron titanate platelet, 8 parts of elastic wear-resistant particles, 3 parts of hydrothermal modified crystalline flake graphite, 4 parts of kieselguhr, 4 parts of micron-sized Ru iron boron powder, 0.5 part of nano ferroferric oxide, 0.5 part of stearic acid, 0.8 part of an anti-aging agent and 1.5 parts of a curing agent.
In the invention, the method for carrying out hydrothermal modification treatment on flake graphite comprises the following steps:
(1) adding a certain amount of Na2MoO4·2H2Adding O and L-cysteine into deionized water, stirring to obtain uniform mixed solution, and adding Na in the mixed solution2MoO4The amount of the substance of L-cysteine is Na in a ratio of 1:6 to the amount of the substance of deionized water2MoO43 times the sum of the amounts of substances of (a);
(2) ultrasonically dispersing crystalline flake graphite powder in deionized water to obtain a suspension, dropwise adding the crystalline flake graphite powder suspension into the mixed solution, and continuously stirring for 1 h, wherein the amount of the crystalline flake graphite powder is equal to Na calculated according to the amount of carbon substances2MoO41.5 times the amount of substance(s);
(3) transferring the reaction mixture obtained in step (2) to a reactor with poly-tetraSealing in a hydrothermal reaction kettle with a fluoroethylene liner, reacting at 240 ℃ for 18h, naturally cooling to room temperature, centrifugally separating a precipitate obtained by the hydrothermal reaction, fully washing with deionized water, and finally drying in vacuum at 60 ℃ for 10h to obtain the hydrothermally modified crystalline flake graphite (MoS)2Flake graphite composite).
Specifically, the nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH 570. The preparation method of the brake pad containing neodymium iron boron powder comprises the following steps:
step S1: pouring the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin into a plow-rake type mixer according to the formula ratio, wherein the mixing time is 10min, and the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin are uniformly dispersed;
step S2: adding the phenolic resin modified by the nano ferroferric oxide and the flake graphite in the step S1, reinforcing fiber, potassium hexatitanate whisker, sepiolite fiber, superfine wollastonite, potassium feldspar powder, sodium iron titanate lamella, diatomite, micron-sized Ru iron boron powder, stearic acid, an anti-aging agent, a curing agent and elastic wear-resistant particles into a rake mixer according to a formula ratio;
step S3: heating a hot-press forming machine mould to 120 ℃, brushing a release agent, weighing a certain weight of mixed materials, putting the mixed materials into the mould, covering a steel backing subjected to shot blasting and gluing, adjusting the temperature of a hot press to 145 ℃, the pressure to 10MPa, and the pressure maintaining time to be 20min, wherein in the process, in order to allow moisture and other volatile media to escape, the pressure is released once every 15s, and the release is continuously carried out for at least 2 times;
step S4: and (3) putting the hot-press molded product into a constant-temperature drying oven, performing heat treatment for 3 hours in a constant-temperature oven at 200 ℃, fully curing, and finally magnetizing in a magnetizing machine.
Example 2
A clutch brake pad containing neodymium iron boron powder is processed from the following raw materials in parts by weight:
16 parts of acrylic pulp, 8 parts of potassium hexatitanate whisker, 14 parts of sepiolite fiber, 10 parts of phenolic resin, 6 parts of superfine wollastonite, 10 parts of potassium feldspar powder, 14 parts of sodium iron titanate platelet, 12 parts of elastic wear-resistant particles, 6 parts of hydrothermal modified crystalline flake graphite, 6 parts of kieselguhr, 6 parts of micron-sized Ru iron boron powder, 1.2 parts of nano ferroferric oxide, 1.5 parts of stearic acid, 1.2 parts of an anti-aging agent and 2.5 parts of a curing agent.
In the invention, the scale graphite is subjected to hydrothermal modification treatment, and the specific treatment method comprises the following steps:
(1) adding a certain amount of Na2MoO4·2H2Adding O and L-cysteine into deionized water, stirring to obtain uniform mixed solution, and adding Na in the mixed solution2MoO4The amount of the substance of L-cysteine is Na in a ratio of 1:6 to the amount of the substance of deionized water2MoO43 times the sum of the amounts of substances of (a);
(2) ultrasonically dispersing crystalline flake graphite powder in deionized water to obtain a suspension, dropwise adding the crystalline flake graphite powder suspension into the mixed solution, and continuously stirring for 1.5h, wherein the amount of the crystalline flake graphite powder is equal to Na calculated according to the amount of carbon substances2MoO41.8 times the amount of substance(s);
(3) transferring the reaction mixture obtained in the step (2) into a hydrothermal reaction kettle with a polytetrafluoroethylene inner container, sealing, reacting for 12 hours at 260 ℃, naturally cooling to room temperature, centrifugally separating a precipitate obtained in the hydrothermal reaction, fully washing with deionized water, and finally drying in vacuum at 70 ℃ for 8 hours to obtain the hydrothermally modified crystalline flake graphite (MoS)2Flake graphite composite).
The nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH 570.
A preparation method of a clutch brake pad containing neodymium iron boron powder comprises the following steps:
step S1: pouring the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin into a plow-rake type mixer according to the formula ratio, wherein the mixing time is 15min, and the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin are uniformly dispersed;
step S2: adding the phenolic resin modified by the nano ferroferric oxide and the flake graphite in the step S1, reinforcing fiber, potassium hexatitanate whisker, sepiolite fiber, superfine wollastonite, potassium feldspar powder, sodium iron titanate lamella, diatomite, micron-sized Ru iron boron powder, stearic acid, an anti-aging agent, a curing agent and elastic wear-resistant particles into a rake mixer according to a formula ratio;
step S3: heating a hot-press forming machine mould to 130 ℃, brushing a release agent, weighing a certain weight of mixed materials, putting the mixed materials into the mould, covering a steel backing subjected to shot blasting and gluing, adjusting the temperature of a hot press to 155 ℃, the pressure to 8MPa, and the pressure maintaining time to be 30min, wherein in the process, in order to allow moisture and other volatile media to escape, the pressure is released once every 15s, and the release is continuously carried out for at least 2 times;
step S4: and (3) putting the hot-press molded product into a constant-temperature drying oven, carrying out heat treatment for 2h in a constant-temperature oven at 210 ℃, fully curing, and finally magnetizing in a magnetizing machine.
Example 3
A clutch brake pad containing neodymium iron boron powder is processed from the following raw materials in parts by weight: 14 parts of acrylic pulp, 6 parts of potassium hexatitanate whisker, 12 parts of sepiolite fiber, 18 parts of phenolic resin, 5 parts of superfine wollastonite, 8 parts of potassium feldspar powder, 12 parts of sodium iron titanate platelet, 10 parts of elastic wear-resistant particles, 4 parts of hydrothermal modified crystalline flake graphite, 5 parts of kieselguhr, 5 parts of micron-sized Ru iron boron powder, 1 part of nano ferroferric oxide, 1 part of stearic acid, 1 part of an anti-aging agent and 2 parts of a curing agent.
In the invention, the scale graphite is subjected to hydrothermal modification treatment, and the specific treatment method comprises the following steps:
(1) adding a certain amount of Na2MoO4·2H2Adding O and L-cysteine into deionized water, stirring to obtain uniform mixed solution, and adding Na in the mixed solution2MoO4The amount of the substance of L-cysteine is Na in a ratio of 1:6 to the amount of the substance of deionized water2MoO43 times the sum of the amounts of substances of (a);
(2) ultrasonically dispersing crystalline flake graphite powder in deionized water to obtain a suspension, dropwise adding the crystalline flake graphite powder suspension into the mixed solution, and continuously stirring for 1 h, wherein the amount of the crystalline flake graphite powder is equal to Na calculated according to the amount of carbon substances2MoO41.6 times the amount of substance(s);
(3) transferring the reaction mixture obtained in the step (2) to water with a polytetrafluoroethylene inner containerSealing in a thermal reaction kettle, reacting at 250 ℃ for 15 h, naturally cooling to room temperature, centrifugally separating a precipitate obtained by the hydrothermal reaction, fully washing with deionized water, and finally drying at 65 ℃ for 9 h in vacuum to obtain the hydrothermally modified crystalline flake graphite (MoS)2Flake graphite composite).
The nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH 570.
A preparation method of a clutch brake pad containing neodymium iron boron powder comprises the following steps:
step S1: pouring the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin into a plow-rake type mixer according to the formula ratio, wherein the mixing time is 12min, and the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin are uniformly dispersed;
step S2: adding the phenolic resin modified by the nano ferroferric oxide and the flake graphite in the step S1, reinforcing fiber, potassium hexatitanate whisker, sepiolite fiber, superfine wollastonite, potassium feldspar powder, sodium iron titanate lamella, diatomite, micron-sized Ru iron boron powder, stearic acid, an anti-aging agent, a curing agent and elastic wear-resistant particles into a rake mixer according to a formula ratio; mixing materials twice for 25min to ensure mixing uniformity, taking out the materials after the first mixing, and putting the materials again for second mixing for 50 min;
step S3: heating a hot-press forming machine mould to 125 ℃, brushing a release agent, weighing a certain weight of mixed materials, putting the mixed materials into the mould, covering a steel backing subjected to shot blasting and gluing, adjusting the temperature of a hot press to 150 ℃, the pressure to 9MPa, and the pressure maintaining time to 25min, wherein in the process, in order to allow moisture and other volatile media to escape, the pressure is released once every 15s, and the release is continuously carried out for at least 2 times;
step S4: and (3) putting the hot-pressed product into a constant-temperature drying box, carrying out heat treatment for 2-3 h in a constant-temperature box with the temperature of 200-210 ℃, fully curing, and finally magnetizing in a magnetizing machine.
The brake pads of examples 1-3 were tested according to the national standard GB5763-1998 and the results are as follows:
the test results show that the friction coefficients of the brake pad prepared by the embodiments at the temperature of 100 ℃ and 400 ℃ are all between 0.36 and 0.39, and when the temperature reaches 400 ℃, the friction coefficients still maintain higher values.
The wear rate of the brake pads prepared in the examples 1-3 is lower than that of the existing commercial products, the wear rate is averagely lower by 5 percent, the service life of the brake pad is prolonged, and the reliability is improved.
The heat dissipation performance of the brake pad prepared in the embodiment 1-3 is improved by about 15% compared with that of the brake pad in the prior art, the local abrasion resistance is enhanced, and the service life of the brake band can be obviously prolonged.
Claims (6)
1. A clutch brake pad containing neodymium iron boron powder is characterized by being processed from the following raw materials in parts by weight: 12-16 parts of acrylic pulp, 5-8 parts of potassium hexatitanate whisker, 10-14 parts of sepiolite fiber, 8-10 parts of phenolic resin, 4-6 parts of superfine wollastonite, 6-10 parts of potassium feldspar powder, 8-14 parts of sodium iron titanate platelet, 8-12 parts of elastic wear-resistant particles, 3-6 parts of hydrothermal modified crystalline flake graphite, 4-6 parts of kieselguhr, 4-6 parts of micron-sized Ru-Fe-B powder, 0.5-1.2 parts of nano ferroferric oxide, 0.5-1.5 parts of stearic acid, 0.8-1.2 parts of an anti-aging agent and 1.5-2.5 parts of a curing agent;
the method for the hydro-thermal modification treatment of the flake graphite comprises the following steps:
(1) adding a certain amount of Na2MoO4 & 2H2O and L-cysteine into deionized water, and stirring to obtain a uniform mixed solution, wherein the mass ratio of Na2MoO4 to the deionized water in the mixed solution is 1:6, and the mass of the L-cysteine is 3 times of the sum of the mass of Na2MoO 4;
(2) ultrasonically dispersing flake graphite powder into deionized water to obtain a suspension, dropwise adding the flake graphite powder suspension into the mixed solution, and continuously stirring for 1-1.5h, wherein the amount of the flake graphite powder is 1.5-1.8 times that of Na2MoO4 calculated by the amount of carbon;
(3) transferring the reaction mixture obtained in the step (2) into a hydrothermal reaction kettle with a polytetrafluoroethylene liner, sealing, reacting at the temperature of 240-260 ℃ for 12-18h, naturally cooling to room temperature, carrying out centrifugal separation on a precipitation product obtained by the hydrothermal reaction, fully washing with deionized water, and finally carrying out vacuum drying at the temperature of 60-70 ℃ for 8-10h to obtain the flake graphite subjected to hydrothermal modification treatment.
2. A clutch brake pad containing neodymium-iron-boron powder according to claim 1,
the material is processed by the following raw materials by weight: 14 parts of acrylic pulp, 6 parts of potassium hexatitanate whisker, 12 parts of sepiolite fiber, 18 parts of phenolic resin, 5 parts of superfine wollastonite, 8 parts of potassium feldspar powder, 12 parts of sodium iron titanate platelet, 10 parts of elastic wear-resistant particles, 4 parts of hydrothermal modified crystalline flake graphite, 5 parts of kieselguhr, 5.6 parts of micron-sized Ru iron boron powder, 1.2 parts of nano ferroferric oxide, 1 part of stearic acid, 1 part of an anti-aging agent and 2 parts of a curing agent.
3. A clutch brake pad containing neodymium-iron-boron powder as claimed in claim 1, wherein the mass ratio of micron-sized Ru-iron-boron powder to nano-sized ferroferric oxide is 14: 3.
4. A clutch-brake pad containing neodymium-iron-boron powder according to claim 1 or 2, characterized in that nano ferroferric oxide is subjected to surface modification treatment by using a coupling agent KH 570.
5. A method of making a brake pad for a clutch containing neodymium-iron-boron powder as defined in claim 1, comprising the steps of:
step S1: pouring the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin into a plow-rake type mixer according to the formula ratio, wherein the mixing time is 10-15min, and the nano ferroferric oxide, the aqueous modified flake graphite and the phenolic resin are uniformly dispersed;
step S2: adding the phenolic resin modified by the nano ferroferric oxide and the flake graphite in the step S1, reinforcing fiber, potassium hexatitanate whisker, sepiolite fiber, superfine wollastonite, potassium feldspar powder, sodium iron titanate lamella, diatomite, micron-sized Ru iron boron powder, stearic acid, an anti-aging agent, a curing agent and elastic wear-resistant particles into a rake mixer according to a formula ratio;
step S3: heating a mold of a hot-press forming machine to 120-;
step S4: and (3) putting the hot-pressed product into a constant-temperature drying box, carrying out heat treatment for 2-3 h in a constant-temperature box with the temperature of 200-210 ℃, fully curing, and finally magnetizing in a magnetizing machine.
6. The method of claim 5, wherein in step S2, the mixing is performed in two steps, each step is performed for 25min, and the first mixed material is taken out and then mixed again for a second time, which is 50min in total.
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