New energy commercial vehicle rare earth silencer brake pad and preparation method thereof

Abstract

The invention provides a new energy commercial vehicle rare earth silencer brake pad and a preparation method thereof. The material formula of the silencer brake pad comprises the following components in percentage by weight: 6-9% of an organic modified binder, 15-30% of rare earth modified reinforced fibers, 10-20% of a friction performance regulator, 20-30% of an anti-wear lubricant, 5-10% of phosphorus cerium lanthanum-brown yttrium niobium composite rare earth minerals, 2-5% of a high-temperature inorganic binder, 5-8% of a friction increasing agent and 20-35% of a space filler. A new energy commercial vehicle rare earth silencer brake pad sample is prepared through a mold pressing method, and a silencer brake pad formula research and development and a manufacturing technology thereof are provided; the silencer brake pad designed and prepared through the method has the advantages of being high in shear strength, stable in friction coefficient, higher in heat dissipation performance, lower in heat fading performance in the product using process, low in hardness, comfortable in braking in the using process, free of noise, capable of resisting frequent heat changes, good in thermal fatigue resistance, small in dust falling amount, long in service life, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of brake pad manufacturing, and particularly relates to a rare earth muffler brake pad for new energy commercial vehicles and a preparation method thereof. Background Art

[0002] Regardless of fuel vehicles and new energy electric vehicles, the basic principle of the braking system is the same. Taking the disc brake system as an example, when the brake pedal is depressed, the caliper will clamp the brake disc, and by using friction, the kinetic energy is converted into heat and consumed, so as to achieve the purpose of decelerating and braking. However, it is very difficult to stop the vehicle with just one foot, so a "brake assist system" is needed. The most common brake assist system is called the "vacuum assist braking system". In traditional fuel vehicles, the intake manifold of the engine is the vacuum source of the whole system. Some turbocharged models are equipped with a mechanical vacuum pump as the vacuum source. However, electric vehicles do not have an engine, so there is no vacuum source for the whole braking system. To solve this problem, different manufacturers adopt different solutions. Some still use the brake system of traditional fuel vehicles, but use an electric vacuum pump. For example, the old Audi Q5 hybrid model uses an electro-hydraulic control brake system. Some vehicle manufacturers simply directly adopt an electronically controlled brake system to replace manual control. Just like the light switch at home, stepping on the brake pedal does not apply force to the brake system, but is to transmit a braking signal to the brake system, and then the electronic brake system completes the braking. That is why the brake system of electric vehicles is more likely to have some problems than most traditional fuel vehicles.

[0003] Traditional fuel vehicles use the intake manifold as the vacuum source and use the engine to drive the brake assist system to work. The electric vacuum pump on electric vehicles is much more complex, including various circuit designs, control logics, human-machine interactions, etc. Theoretically, the more complex the system, the higher the probability of problems. Not only is there a problem with the electric vacuum pump, but for some electric vehicle models, the electronically controlled brake system, which is part of the intelligent driving assistance system, may also have problems. There is a paper in the "Automobile Practical Technology Journal" which mentions that even for intelligent driving assistance systems above L3 level, the electronic control system may fail. Therefore, many electronic brake systems have a safety mode. For example, Bosch's electronic brake system can allow the driver to operate the brake pedal without assistance when the system is completely powered off, in order to prevent the sudden collapse of the electronic control system, resulting in brake failure. Although the failure probability of the electronic control system of electric vehicles is very low, it fails 10 times every 1 billion hours, which is about the same as the accident probability of an airplane, but it still sounds worrying.

[0004] Generally speaking, the braking system of electric vehicles is more complex than that of traditional fuel vehicles, and there are more uncertainties. Compared with traditional fuel vehicles, it is more likely to have problems, but the probability of problems is actually very low. In summary, the braking system of new energy electric commercial vehicles puts forward higher requirements for the stability of brake pads. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention prepares a rare earth muffler brake pad sample for new energy commercial vehicles by the molding method, explores the influence of different phosphocerium lanthanum - fergusonite composite rare earth minerals on the friction and wear performance and main wear mechanisms of the improved ceramic disc brake pads, and researches, develops and designs a rare earth muffler brake pad formula research and development and its manufacturing technology for new energy commercial vehicles.

[0006] The present invention solves the above - mentioned technical problems through the following solutions:

[0007] A rare earth muffler brake pad for new energy commercial vehicles, the material formula of the muffler brake pad is calculated by weight percentage as follows: organic modified binder 6 - 9%, rare earth modified reinforcing fiber 15 - 30%, friction performance regulator 10 - 20%, anti - wear lubricant 20 - 30%, phosphocerium lanthanum - fergusonite composite rare earth mineral 5 - 10%, high - temperature inorganic binder 2 - 5%, abrasion - increasing agent 5 - 8%, space filler 20 - 35%.

[0008] Preferably, the material formula of the organic modified binder is calculated by weight percentage as follows: nano - ZnO modified phenolic resin 40 - 60%, silicone - modified phenolic resin 40 - 50% and viscosity regulator 5 - 15%.

[0009] Preferably, the material formula of the rare earth modified reinforcing material fiber is calculated by weight percentage as follows: phosphocerium lanthanum - fergusonite composite mineral fiber 30 - 50%, potassium titanate microcrystal 25 - 35%, ceramic fiber 20 - 30%, carbon fiber 5 - 15% and cerium lanthanum - yttrium niobium rare earth coordination - modified polybenzimidazole fiber 5 - 15%.

[0010] Preferably, the material formula of the friction performance regulator is calculated by weight percentage as follows: nitrile powder 20 - 40%, red vermiculite 40 - 50% and friction powder 20 - 40%.

[0011] Preferably, the material formula of the anti - wear lubricant is calculated by weight percentage as follows: 895 graphite 30 - 60%, artificial graphite 20 - 40%, calcined petroleum coke powder 10 - 20% and carbon black 5 - 15%.

[0012] Preferably, the phosphocerium lanthanum - fergusonite composite rare earth mineral is a mixed fine powder of phosphocerium lanthanum rare earth mineral fine powder and fergusonite rare earth mineral fine powder, and the mixing ratio is 1 - 5:1 - 5.

[0013] Preferably, the material formula of the high-temperature inorganic binder is calculated by weight percentage as follows: 50-60% of antimony sulfide and 40-50% of molybdenum disulfide.

[0014] Preferably, the abrasive enhancer is 40-50% of zirconia and 50-60% of calcined ultrafine kaolin.

[0015] Preferably, the space filler is 60-70% of calcined barium sulfate and 30-40% of ultrafine mica powder.

[0016] A preparation method of a rare earth muffler brake pad for a new energy commercial vehicle as described above includes the following preparation steps:

[0017] (1) Batching: Weigh each component raw material according to the above weight percentage of the material formula of the muffler brake pad and set aside for use;

[0018] (2) Mixing: Put the weighed component raw materials into a vertical high-speed mixer and mix for 4-5 minutes;

[0019] (3) Molding: Weigh the mixed material according to the brake pad model, pour it into a hot pressing mold, set the hot pressing pressure to 200-300 kg·f / cm 2 , the hot pressing temperature is 145-155 °C, exhaust once every 10-15 seconds of pressing, a total of 6-9 times of exhaust, and the pressure holding time is 600 seconds;

[0020] (4) Heat treatment: Heat the hot-pressed brake pad from room temperature to 170-180 °C within 4-5 hours, keep it warm for 6-8 hours, and then stop heating and cool the oven temperature to below 50 °C;

[0021] (5) Post-processing: Then, plane grind, chamfer, slot, spray plastic, print marks on the muffler brake pad prepared according to the above process according to technical requirements, and package it after processing to obtain the muffler brake pad.

[0022] The beneficial effects of the present invention are as follows: The muffler brake pads produced by the present invention have the characteristics of high shear strength resistance, stable friction coefficient, higher heat dissipation performance, lower heat fade performance during product use, low hardness, comfortable braking during use, no noise, can resist frequent thermal changes, good thermal fatigue resistance, less dust falling, long service life, safety and reliability, meet production requirements and can be mass-produced, which is beneficial to improving customer satisfaction and has good applicability and popularization. Specific embodiments

[0023] Next, in combination with the technical content of the embodiments described in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] A rare earth muffler brake pad for new energy commercial vehicles, the material formula of the muffler brake pad is calculated by weight percentage as follows: organic modified binder 7%, rare earth modified reinforcing fiber 20%, friction performance regulator 10%, anti-wear lubricant 25%, phosphocerium lanthanum - fergusonite composite rare earth mineral 5%, high-temperature inorganic binder 5%, abrasion increasing agent 5%, space filler 23%

[0026] Further, the material formula of the organic modified binder is calculated by weight percentage as follows: nano-ZnO modified phenolic resin 50%, silicone modified phenolic resin 40%, and viscosity regulator 10%.

[0027] Further, the material formula of the rare earth modified reinforcing fiber is calculated by weight percentage as follows: phosphocerium lanthanum - fergusonite composite mineral fiber 40%, potassium titanate microcrystals 25%, ceramic fiber 20%, carbon fiber 10%, and cerium lanthanum - yttrium niobium rare earth coordination modified polybenzimidazole fiber 5%.

[0028] Further, the material formula of the friction performance regulator is calculated by weight percentage as follows: nitrile powder 30%, red vermiculite 40%, and friction powder 30%.

[0029] Further, the material formula of the anti-wear lubricant is calculated by weight percentage as follows: 895 graphite 50%, artificial graphite 30%, calcined petroleum coke powder 15%, and carbon black 5%.

[0030] Further, the phosphocerium lanthanum - fergusonite composite rare earth mineral is a mixed fine powder of phosphocerium lanthanum rare earth mineral fine powder and fergusonite rare earth mineral fine powder, and the mixing ratio is 1:1.

[0031] Further, the material formula of the high-temperature inorganic binder is calculated by weight percentage as follows: antimony sulfide 60% and molybdenum disulfide 40%.

[0032] Further, the abrasion increasing agent is zirconia 40% and calcined ultra-fine kaolin 60%.

[0033] Further, the space filler is calcined barium sulfate 70% and ultra-fine mica powder 30%.

[0034] A preparation method of a rare earth muffler brake pad for new energy commercial vehicles as described above, comprising the following preparation steps:

[0035] (1) Ingredients: Weigh the raw materials of each component accurately according to the above weight percentages in the material formula of the muffler brake pads for standby;

[0036] (2) Mixing: Put the weighed raw materials of each component into a vertical high-speed mixer, and the mixing time is 4 - 5 minutes;

[0037] (3) Molding: Weigh the mixed materials according to the brake pad model, pour them into a hot pressing mold, set the hot pressing pressure to 200 - 300 kg·f / cm 2 , the hot pressing temperature is 145 - 155 °C, exhaust air once every 10 - 15 seconds of pressing, and exhaust air for a total of 6 - 9 times, and the pressure holding time is 600 seconds;

[0038] (4) Heat treatment: Heat the brake pads after hot pressing and molding from room temperature to 170 - 180 °C within 4 - 5 hours, keep warm for 6 - 8 hours, and then stop heating and cool to below 50 °C in the oven temperature;

[0039] (5) Post-processing: Then plane grind, chamfer, slot, spray plastic, print labels on the muffler brake pads prepared according to the above process according to the technical requirements, and package after processing to obtain the muffler brake pads.

[0040] Example 2

[0041] A rare earth muffler brake pad for new energy commercial vehicles, the material formula of the muffler brake pad is calculated by weight percentage as: organic modified binder 8%, rare earth modified reinforcing fiber 22%, friction performance regulator 12%, anti-wear lubricant 20%, phosphocerium lanthanum - fergusonite composite rare earth mineral 6%, high-temperature inorganic binder 4%, abrasion increasing agent 6%, space filler 22%.

[0042] Furthermore, the material formula of the organic modified binder is calculated by weight percentage as: nano-ZnO modified phenolic resin 55%, silicone modified phenolic resin 40% and viscosity regulator 5%.

[0043] Furthermore, the material formula of the rare earth modified reinforcing fiber is calculated by weight percentage as: phosphocerium lanthanum - fergusonite composite mineral fiber 35%, potassium titanate microcrystals 30%, ceramic fiber 25%, carbon fiber 5% and cerium lanthanum - yttrium niobium rare earth coordination modified polybenzimidazole fiber 5%.

[0044] Furthermore, the material formula of the friction performance regulator is calculated by weight percentage as: nitrile powder 40%, red vermiculite 40% and friction powder 20%.

[0045] Furthermore, the material formula of the anti-wear lubricant is calculated by weight percentage as: 895 graphite 40%, artificial graphite 30%, calcined petroleum coke powder 20% and carbon black 10%.

[0046] Further, the phosphocerite - fergusonite composite rare - earth mineral is a mixed powder of phosphocerite rare - earth mineral fine powder and fergusonite rare - earth mineral fine powder, and the mixing ratio is 3:5.

[0047] Further, the material formula of the high - temperature inorganic binder is calculated by weight percentage as follows: antimony sulfide 55% and molybdenum disulfide 45%.

[0048] Further, the abrasion - increasing agent is 45% zirconia and 55% calcined ultra - fine kaolin.

[0049] Further, the space filler is 60% calcined barium sulfate and 40% ultra - fine mica powder.

[0050] A preparation method of a rare - earth muffler brake pad for a new - energy commercial vehicle as described above includes the following preparation steps:

[0051] (1) Batching: Weigh each component raw material accurately according to the above weight percentage of the material formula of the muffler brake pad and set aside.

[0052] (2) Mixing: Put the weighed component raw materials into a vertical high - speed mixer, and the mixing time is 4 - 5 min.

[0053] (3) Molding: Weigh the mixed material according to the brake - pad model, pour it into a hot - pressing mold, set the hot - pressing pressure to 200 - 300 kg·f / cm 2 , the hot - pressing temperature is 145 - 155 °C, exhaust once every 10 - 15 s of pressing, and exhaust a total of 6 - 9 times, and the pressure - holding time is 600 s.

[0054] (4) Heat treatment: Heat the hot - pressed brake pad from room temperature to 170 - 180 °C within 4 - 5 h, keep it warm for 6 - 8 h, and then stop heating and cool the oven temperature to below 50 °C.

[0055] (5) Post - processing: Then plane - grind, chamfer, slot, spray - paint, and print marks on the muffler brake pad prepared according to the above process according to technical requirements, and package it after processing to obtain the muffler brake pad.

[0056] Example 3

[0057] A rare - earth muffler brake pad for a new - energy commercial vehicle, the material formula of the muffler brake pad is calculated by weight percentage as follows: organic - modified binder 7.5%, rare - earth - modified reinforcing fiber 21.5%, friction - property regulator 11%, anti - wear lubricant 21%, phosphocerite - fergusonite composite rare - earth mineral 7%, high - temperature inorganic binder 3%, abrasion - increasing agent 8%, space filler 21%.

[0058] Further, the material formula of the organic - modified binder is calculated by weight percentage as follows: nano - ZnO - modified phenolic resin 45%, silicone - modified phenolic resin 45%, and viscosity regulator 10%.

[0059] Further, the material formula of the rare earth modified reinforcing fiber is calculated by weight percentage as follows: 30% of phosphocerium lanthanum - fergusonite composite mineral fiber, 30% of potassium titanate microcrystals, 20% of ceramic fiber, 10% of carbon fiber, and 10% of cerium lanthanum - yttrium niobium rare earth coordination modified polybenzimidazole fiber.

[0060] Further, the material formula of the friction performance regulator is calculated by weight percentage as follows: 35% of nitrile powder, 45% of red vermiculite, and 20% of friction powder.

[0061] Further, the material formula of the anti - wear lubricant is calculated by weight percentage as follows: 45% of 895 graphite, 25% of artificial graphite, 15% of calcined petroleum coke powder, and 15% of carbon black.

[0062] Further, the phosphocerium lanthanum - fergusonite composite rare earth mineral is a mixed fine powder of phosphocerium lanthanum rare earth mineral fine powder and fergusonite rare earth mineral fine powder, and the mixing ratio is 5:4.

[0063] Further, the material formula of the high - temperature inorganic binder is calculated by weight percentage as follows: 50% of antimony sulfide and 50% of molybdenum disulfide.

[0064] Further, the abrasive enhancer is 50% of zirconia and 50% of calcined ultra - fine kaolin.

[0065] Further, the space filler is 65% of calcined barium sulfate and 35% of ultra - fine mica powder.

[0066] A preparation method of a rare earth muffler brake pad for a new - energy commercial vehicle as described above includes the following preparation steps:

[0067] (1) Weighing ingredients: Weigh each component raw material accurately according to the above weight percentage of the material formula of the muffler brake pad, and set aside;

[0068] (2) Mixing: Put the weighed component raw materials into a vertical high - speed mixer, and the mixing time is 4 - 5 min;

[0069] (3) Molding: Weigh the mixed material according to the brake pad model, pour it into a hot - press mold, set the hot - press pressure to 200 - 300 kg·f / cm 2 , the hot - press temperature is 145 - 155 °C, exhaust once every 10 - 15 s of pressing, a total of 6 - 9 times of exhaust, and the pressure - holding time is 600 s;

[0070] (4) Heat treatment: Heat the hot - pressed brake pad from room temperature to 170 - 180 °C within 4 - 5 h, keep it warm for 6 - 8 h, and then stop heating and cool it in the oven until the temperature is below 50 °C;

[0071] (5) Post-processing: The muffler brake pads prepared by the above process are then surface-ground, chamfered, grooved, sprayed, and printed according to technical requirements, and packaged to obtain muffler brake pads after processing.

[0072] Example 4

[0073] A rare earth muffler brake pad for a new energy commercial vehicle. The material formula of the muffler brake pad is calculated as follows by weight percentage: 9% of organic modified binder, 24% of rare earth modified reinforcing fiber, 10% of friction performance regulator, 20% of anti-wear lubricant, 10% of phosphorus cerium lanthanum-brown yttrium niobium composite rare earth mineral, 2% of high-temperature inorganic binder, 5% of wear-increasing agent, and 20% of space filler.

[0074] Preferably, the material formula of the organic modified binder is calculated by weight percentage as follows: 45% of nano ZnO modified phenolic resin, 40% of siloxane modified phenolic resin and 15% of viscosity regulator.

[0075] Preferably, the material formula of the rare earth modified reinforcing material fiber is calculated by weight percentage as follows: 35% cerium lanthanum-brown yttrium niobium composite mineral fiber, 25% potassium titanate microcrystals, 20% ceramic fiber, 5% carbon fiber and 15% cerium lanthanum-yttrium niobium rare earth coordination modified polybenzimidazole fiber.

[0076] Preferably, the material formula of the friction performance regulator is calculated by weight percentage as follows: 40% nitrile powder, 40% red vermiculite and 20% friction powder.

[0077] Preferably, the material formula of the anti-wear lubricant is calculated by weight percentage as follows: 30% 895 graphite, 40% artificial graphite, 20% calcined petroleum coke powder and 10% carbon black.

[0078] Preferably, the lanthanum cerium-brown yttrium niobium composite rare earth mineral is a mixed powder of lanthanum cerium-brown yttrium niobium rare earth mineral powder and brown yttrium niobium rare earth mineral powder, and the mixing ratio is 5:1.

[0079] Preferably, the material formula of the high temperature inorganic binder is calculated by weight percentage as follows: 50% antimony sulfide and 50% molybdenum disulfide.

[0080] As a preferred embodiment, the grinding enhancer is 50% zirconium oxide and 50% calcined ultrafine kaolin.

[0081] Preferably, the space filler is 70% calcined barium sulfate and 30% ultrafine mica powder.

[0082] A method for preparing the rare earth muffler brake pad for new energy commercial vehicles as described above comprises the following preparation steps:

[0083] (1) Ingredients: Accurately weigh the raw materials of each component of the muffler brake pad material formula according to the above weight percentage and set aside;

[0084] (2) Mixing: Put the weighed raw materials of each component into a vertical high-speed mixer, and the mixing time is 4 - 5 minutes;

[0085] (3) Molding: Weigh the mixed material according to the brake pad model, pour it into a hot pressing mold, set the hot pressing pressure to 200 - 300 kg·f / cm 2 , the hot pressing temperature is 145 - 155 °C, exhaust air once every 10 - 15 seconds of pressing, and exhaust air 6 - 9 times in total, and the pressure holding time is 600 seconds;

[0086] (4) Heat treatment: Heat the brake pads after hot pressing from room temperature to 170 - 180 °C within 4 - 5 hours, keep warm for 6 - 8 hours, and then stop heating and cool the oven temperature to below 50 °C;

[0087] (5) Post-processing: Then plane grind, chamfer, grooving, spray plastic, print marks on the muffler brake pads prepared according to the above process according to the technical requirements, and package after processing to obtain muffler brake pads.

[0088] In the present invention, the muffler brake pads produced by the present invention have the characteristics of high shear strength, stable friction coefficient, higher heat dissipation performance, lower heat fade performance during product use, low hardness, comfortable braking during use, no noise, can resist frequent thermal changes, good thermal fatigue resistance, less dust falling, long service life, safe and reliable, meet the production requirements and can be mass-produced, which is beneficial to improving customer satisfaction, and has good applicability and popularization.

[0089] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rare earth muffler brake pad for new energy commercial vehicles, characterized in that: The material formula of the muffler brake pad is calculated by weight percentage as follows: 6-9% of organic modified binder, 15-30% of rare earth modified reinforcing fiber, 10-20% of friction performance regulator, 20-30% of anti-wear lubricant, 5-10% of phosphorus cerium lanthanum-brown yttrium niobium composite rare earth mineral, 2-5% of high-temperature inorganic binder, 5-8% of wear enhancer, and 20-35% of space filler.

2. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The material formula of the organic modified binder is calculated by weight percentage as follows: 40-60% of nano ZnO modified phenolic resin, 40-50% of siloxane modified phenolic resin and 5-15% of viscosity regulator.

3. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The material formula of the rare earth modified reinforcing material fiber is calculated by weight percentage: 30-50% of phosphorus cerium lanthanum-brown yttrium niobium composite mineral fiber, 25-35% of potassium titanate microcrystals, 20-30% of ceramic fiber, 5-15% of carbon fiber and 5-15% of cerium lanthanum-yttrium niobium rare earth coordination modified polybenzimidazole fiber.

4. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The material formula of the friction performance regulator is calculated by weight percentage as follows: 20-40% of nitrile powder, 40-50% of red vermiculite and 20-40% of friction powder.

5. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The material formula of the anti-wear lubricant is calculated by weight percentage as follows: 30-60% of 895 graphite, 20-40% of artificial graphite, 10-20% of calcined petroleum coke powder and 5-15% of carbon black.

6. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The cerium phosphate lanthanum-brown yttrium niobium composite rare earth mineral is a mixed powder of cerium phosphate lanthanum rare earth mineral powder and brown yttrium niobium rare earth mineral powder, and the mixing ratio is 1-5:1-5.

7. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The material formula of the high-temperature inorganic binder is calculated by weight percentage as follows: 50-60% antimony sulfide and 40-50% molybdenum disulfide.

8. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The grinding agent is 40-50% of zirconium oxide and 50-60% of calcined ultrafine kaolin.

9. The rare earth muffler brake pad for new energy commercial vehicles according to claim 1, characterized in that: The space filler is 60-70% of calcined barium sulfate and 30-40% of superfine mica powder.

10. A method for preparing a rare earth muffler brake pad for a new energy commercial vehicle according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: (1) Ingredients: Accurately weigh the raw materials of each component of the muffler brake pad material formula according to the above weight percentage and set aside; (2) Mixing: Put the weighed raw materials of each component into a vertical high-speed mixer, and the mixing time is 4 to 5 minutes; (3) Molding: Weigh the mixed material according to the brake pad model, pour it into the hot pressing mold, and set the hot pressing pressure to 200-300 kg·f / cm 2 , the hot pressing temperature is 145-155℃, the air is exhausted every 10-15s, a total of 6-9 times, and the holding time is 600s; (4) Heat treatment: The heat-pressed brake pad is heated from room temperature to 170-180°C within 4-5 hours, kept at this temperature for 6-8 hours, and then the temperature is stopped and cooled to below 50°C in the oven; (5) Post-processing: The muffler brake pads prepared by the above process are then surface-ground, chamfered, grooved, sprayed, and printed according to technical requirements, and packaged to obtain muffler brake pads after processing.