Preparation method and application of resin-based friction material

Abstract

The invention belongs to the technical field of friction material preparation, and discloses a preparation method and application of a resin-based friction material.The preparation method comprises the steps that phenol and a basic catalyst are mixed and stirred for 0.51 h at the temperature of 60 DEG C-70 DEG C, and a first mixed product is obtained; dropwise adding a formaldehyde-furfural mixed solution, and stirring at 70-80 DEG C for 2.53 hours to obtain a second mixed product; heating the second mixed product to 140-150 DEG C, adding phenylboronic acid, and stirring for 12 hours to obtain liquid modified phenolic resin; adjusting the pH value of the liquid modified phenolic resin to be acidic, and performing vacuum treatment to obtain modified phenolic resin powder; phenylboronic acid ester and furan rings are introduced into phenolic resin, the number of phenolic hydroxyl groups in the phenolic resin is reduced, the thermal stability of molecular chains is improved, the heat resistance of resin is improved, and the performance of a resin-based friction plate matched with a carbon ceramic disc is improved. And more stable friction performance and heat fading resistance are obtained.

Description

Technical Field

[0001] This invention belongs to the field of friction material preparation technology, and relates to a method for preparing and applying a resin-based friction material. Background Technology

[0002] Phenolic resin, one of the three major synthetic thermosetting resins, is a polymer obtained by addition-condensation reaction of phenolic and aldehyde compounds. Due to its excellent properties such as high mechanical strength, good adhesion, heat resistance, corrosion resistance, and insulation, it has become a key raw material in many fields, including adhesives, anti-corrosion materials, abrasives, refractory materials, friction materials, and bakelite products. It also plays an irreplaceable role in building insulation, aerospace, and electronics industries, providing high-performance material support for various sectors.

[0003] With continuous social development and increasing demands, the limitations of ordinary phenolic resins have gradually become apparent. Due to the high content of hydroxymethyl and phenolic hydroxyl groups in the phenolic resin molecular chain, its temperature resistance is poor, severely limiting its application range. For example, when resin-based friction pads are matched with carbon-ceramic brake discs, the friction interface temperature is higher than that when matched with cast iron brake discs, and may even exceed the thermal decomposition temperature of phenolic resin. This leads to the failure of the binder near the friction surface, a decrease in the bonding strength between components, and consequently, a rapid decline in the coefficient of friction due to thermal degradation.

[0004] Chinese Patent 201310119734.7 describes the preparation of phenylboronic acid-modified phenolic resin by adding phenylboronic acid to the reaction system. The resulting arylboronic phenolic resin exhibits a high thermal decomposition temperature and char residue, along with superior processability and mechanical properties. Chinese Patent 202411633321.5 describes the preparation of borosilicate phenolic resin by introducing 4-hydroxyphenylboronic acid and silicone resin, demonstrating excellent heat resistance and processability. A study published in *ACS Omega*, Volume 5, Issue 17, 2020, synthesized a resorcinol-furfural thermosetting resin using ethanol as a solvent and resorcinol and furfural as raw materials, achieving a thermal decomposition temperature of 343.5℃ and a char residue of 63.45%. A study published in *Polymers*, Volume 12, Issue 12, 2020, prepared a furfural-modified lignin phenolic resin using furfural as a crosslinking agent. The modified phenolic resin exhibits stronger adhesion and greater practical value.

[0005] However, while phenolic resin modified with phenylboronic acid exhibits good heat resistance, controlling the reaction temperature presents a challenge. Too low a temperature hinders the reaction, while too high a temperature increases byproducts and reduces the effective product. Furfural-modified phenolic resin, although showing improved adhesion and heat resistance, decomposes significantly above 500℃. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for preparing resin-based friction materials and their applications.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for preparing a resin-based friction material, comprising the following steps: mixing phenol with an alkaline catalyst, and heating at 60°C. Stir at 70℃ for 0.5 seconds. After 1 hour, a first mixed product was obtained; a formaldehyde-furfural mixed solution was added dropwise to the first mixed product, and the mixture was heated at 70°C. Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained; the second mixed product was then heated to 140°C. Add phenylboronic acid at 150℃ and stir for 1 minute. Liquid modified phenolic resin was obtained after 2 hours; the pH value of the liquid modified phenolic resin was adjusted to acidic, and the modified phenolic resin powder was obtained by vacuum treatment; the modified phenolic resin powder was mixed with reinforcing fibers, friction modifiers, friction reducers and space fillers, and hot-pressed to obtain resin-based friction material.

[0008] Furthermore, the alkaline catalyst is sodium hydroxide, and the mass of the sodium hydroxide is 0.8 times the mass of the phenol. 1.5%; the mass of the phenylboronic acid is 10% of the mass of phenol and formaldehyde. 15%.

[0009] Further, the molar ratio of phenol to formaldehyde is 1:1.2; the molar ratio of phenol to furfural is 1:0.1. 0.3.

[0010] Furthermore, the reinforcing fiber has a weight percentage of 45%. 50%; the modified phenolic resin powder has a weight percentage of 6%. 9%; the friction modifier is 25% by weight. 30%; the friction reducer is 5% by weight. 10%; the weight percentage of the space filler is 10%. 15%.

[0011] Furthermore, the reinforcing fiber is one or a mixture of several of the following: steel fiber, carbon fiber, basalt fiber, silicon carbide fiber, and alumina fiber.

[0012] Furthermore, the friction modifier is one or a mixture of several of the following: alumina, zirconium silicate, titanium boride, chromium trioxide, silicon carbide, silicon dioxide, and light magnesium oxide.

[0013] Furthermore, the friction reducing agent is one or a mixture of several of the following: graphite, expanded graphite, hexagonal boron nitride, tin disulfide, tin sulfide, tin, molybdenum disulfide, antimony sulfide, and aluminum.

[0014] Furthermore, the space filler is one or a mixture of several of the following: barium sulfate, coke, vermiculite, graphene nanosheets, calcium metasilicate, potassium hexatitanate whiskers, and talc.

[0015] Furthermore, the hot pressing includes a first hot pressing, a second hot pressing, and a third hot pressing; the temperature of the first hot pressing is 80°C, and the pressure is 10. 15 MPa, 15 s, repeat 3 times Five times; the second hot pressing was performed at a temperature of 120°C and a pressure of 20. 30 MPa, time 15 s, repeat 3 times Five times; the third hot pressing was performed at a temperature of 180°C and a pressure of 20. 30 MPa, time 15 min.

[0016] A friction pad, said friction pad being made from the above-mentioned resin-based friction material.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a method for preparing a resin-based friction material. By introducing phenylboronic acid esters and furan rings into the molecular structure of phenolic resin, the number of phenolic hydroxyl groups in the phenolic resin is reduced, thereby improving the stability of the phenolic resin molecular chain during heating, reducing mass loss during the thermal decomposition of the phenolic resin, and enhancing the heat resistance of the phenolic resin. The improved heat resistance of the phenolic resin can enhance the performance of resin-based friction pads using phenolic resin, and when paired with carbon ceramic discs, it achieves more stable friction performance and resistance to thermal degradation. Attached Figure Description

[0018] Figure 1 This is a flowchart of a method for preparing a resin-based friction material according to the present invention; Figure 2 This is a structural diagram of the second mixed product in an embodiment of the present invention; Figure 3 This is a structural diagram of the modified phenolic resin powder in an embodiment of the present invention; Figure 4 This is a thermogravimetric curve of the cured modified phenolic resin powder in Example 2 of the present invention; Figure 5 This is a characteristic value test curve of the resin-based friction material in Embodiment 2 of the present invention; Figure 6 This is a thermal decay test curve of the resin-based friction material in Example 2 of the present invention; Figure 7This is a thermogravimetric curve of the cured modified phenolic resin powder in Example 3 of the present invention; Figure 8 This is a characteristic value test curve of the resin-based friction material in Example 3 of the present invention; Figure 9 This is a thermal decay test curve of the resin-based friction material in Example 3 of the present invention; Figure 10 This is a thermogravimetric curve of the cured modified phenolic resin powder in Example 4 of the present invention; Figure 11 This is a characteristic value test curve of the resin-based friction material in Example 4 of the present invention; Figure 12 This is a thermal decay test curve of the resin-based friction material in Example 4 of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] A method for preparing a resin-based friction material involves replacing a portion of formaldehyde with furfural and then adding phenylboronic acid. Furfural itself possesses good heat resistance and can undergo condensation reactions; the high electron density at the 5-position of the furan ring in furfural facilitates nucleophilic substitution reactions and polymerization to form a resin. Therefore, by introducing furfural to improve the adhesion and heat resistance of the modified resin, furfural increases the reactive sites of the phenolic resin molecular chain, improves the reaction between phenylboronic acid and the resin molecular chain, and reduces the difficulty of introducing phenylboronic acid into the resin. Simultaneously, the reaction temperature is controlled at 140℃. Between 150℃ and 1 reaction time Between 2 hours, the dehydration condensation reaction between phenylboronic acids is reduced, minimizing the generation of ineffective byproducts. Simultaneously, the phenylboronic acid reacts fully with the phenolic hydroxyl and hydroxymethyl groups to form a heat-resistant phenylboronic ester structure, resulting in a furfural and phenylboronic acid-modified phenolic resin with good heat resistance and adhesion. Finally, hot pressing offers advantages such as low cost, short cycle time, high formula adjustability, and ease of large-scale production, thereby improving the friction performance and heat fading resistance of resin-based friction pads when matched with carbon ceramic discs.

[0021] Example 1 A method for preparing a resin-based friction material, such as Figure 1 As shown, it includes the following steps: Phenol was mixed with an alkaline catalyst and heated at 60°C. Stir at 70℃ for 0.5 seconds. After 1 hour, a first mixed product was obtained; a formaldehyde-furfural mixed solution was added dropwise to the first mixed product, and the mixture was heated at 70°C. Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained; the second mixed product was then heated to 140°C. Add phenylboronic acid at 150℃ and stir for 1 minute. Liquid modified phenolic resin was obtained after 2 hours; the pH value of the liquid modified phenolic resin was adjusted to acidic, and the modified phenolic resin powder was obtained by vacuum treatment; the modified phenolic resin powder was mixed with reinforcing fibers, friction modifiers, friction reducers and space fillers, and hot-pressed to obtain resin-based friction material.

[0022] Specifically, phenol was added to a 250 mL three-necked flask, followed by an alkaline catalyst. In this example, the alkaline catalyst was sodium hydroxide, and the mass of sodium hydroxide was 0.8 times the mass of phenol. 1.5%, with the reaction temperature controlled at 60℃. Stir continuously for 0.5 minutes at 70℃. The first mixed product, sodium phenolate, was obtained after 1 hour. The three-necked flask was connected to a condenser, a constant-pressure dropping funnel, and a stirring device.

[0023] The formaldehyde-furfural mixed solution was loaded into a constant pressure dropping funnel, and the solution was added at 0.5... Add dropwise to the first mixture within 1 hour, and at 70°C Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained, which was a furfural-modified phenolic resin. The structure of the second mixed product is as follows: Figure 2 As shown in the figure. The molar ratio of phenol to formaldehyde is 1:1.2, and the molar ratio of phenol to furfural is 1:0.1. 0.3.

[0024] The second mixture was heated to 140°C. Add phenylboronic acid at 150℃ and stir continuously for 1 minute. Liquid modified phenolic resin was obtained after 2 hours. The structure of the modified phenolic resin is as follows: Figure 3 As shown. The mass of phenylboronic acid is 10% of the mass of phenol and formaldehyde. 15%.

[0025] The pH of the liquid-modified phenolic resin was adjusted to acidic using oxalic acid, and then placed in a vacuum drying oven at 65°C. Drying under vacuum at 85℃ for 3 days After 8 hours of natural cooling to room temperature, the mixture is ground into powder to obtain modified phenolic resin powder.

[0026] By weight percentage, 45 50% reinforced fiber, 6 9% modified phenolic resin powder, 25 30% friction modifier, 5 10% friction reducer, 10 A resin-based friction material is obtained by mixing 15% space filler, hot pressing, and demolding. The reinforcing fiber is one or a mixture of several of steel fiber, carbon fiber, basalt fiber, silicon carbide fiber, and alumina fiber; the friction modifier is one or a mixture of several of alumina, zirconium silicate, titanium boride, chromium trioxide, silicon carbide, silicon dioxide, and light magnesium oxide; the friction reducer is one or a mixture of several of graphite, expanded graphite, hexagonal boron nitride, tin disulfide, tin sulfide, tin, molybdenum disulfide, antimony sulfide, and aluminum; and the space filler is one or a mixture of several of barium sulfate, coke, vermiculite, graphene nanosheets, calcium metasilicate, potassium hexatite whiskers, and talc.

[0027] Hot pressing includes a first hot pressing, a second hot pressing, and a third hot pressing; the temperature of the first hot pressing is 80℃, and the pressure is 10. 15 MPa, 15 s, repeat 3 times Five times; the second hot pressing was performed at a temperature of 120℃ and a pressure of 20. 30 MPa, time 15 s, repeat 3 times Five times; the third hot pressing was performed at a temperature of 180℃ and a pressure of 20. 30 MPa, time 15 min.

[0028] Example 2 Phenol was mixed with an alkaline catalyst and heated at 60°C. Stir at 70℃ for 0.5 seconds. After 1 hour, a first mixed product was obtained; a formaldehyde-furfural mixed solution was added dropwise to the first mixed product, and the mixture was heated at 70°C. Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained; the second mixed product was then heated to 140°C. Add phenylboronic acid at 150℃ and stir for 1 minute. Liquid modified phenolic resin was obtained after 2 hours; the pH value of the liquid modified phenolic resin was adjusted to acidic, and the mixture was vacuum treated and ground to obtain modified phenolic resin powder; the modified phenolic resin powder was mixed with reinforcing fibers, friction modifiers, friction reducers and space fillers, and hot-pressed to obtain resin-based friction material.

[0029] Specifically, 47.1g of molten phenol was added to a 250mL three-necked flask equipped with a condenser, a constant pressure dropping funnel and a stirring device, followed by 4.71g of sodium hydroxide. The reaction temperature was controlled at 60℃ and the mixture was stirred continuously for 0.5h.

[0030] Weigh 47.4g of formaldehyde and 12g of furfural to prepare a formaldehyde-furfural mixed solution. Add the formaldehyde-furfural mixed solution dropwise to the first mixed product, heat to 70℃, and stir continuously for 2.5h to obtain the second mixed product.

[0031] The second mixture was heated to 140°C, and 9.45 g of phenylboronic acid was added in one go. The mixture was stirred continuously for 1.5 h to obtain a liquid-modified phenolic resin. The pH of the liquid-modified phenolic resin was adjusted to acidic using oxalic acid; that is, the pH value should be... 7. Place the adjusted solution into a vacuum drying oven, dry it under vacuum at 80°C for 6 hours, remove it from the vacuum drying oven and allow it to cool naturally to room temperature, then grind it into powder to obtain modified phenolic resin powder.

[0032] By weight percentage, mix 48% steel fiber, 6.5% modified phenolic resin powder, 3.3% silicon dioxide, 2.5% aluminum oxide, 2.6% silicon carbide, 5.1% chromium trioxide, 12.5% ​​magnesium oxide, 4% graphite, 3% molybdenum disulfide, 8% barium sulfate, and 4.5% calcium metasilicate. Apply the release agent evenly to the mold surface, add the mixed powder, and preheat in a hot press. Once the hot press temperature reaches 80℃, adjust the pressure to 10... Pre-compression at 15 MPa for 15 seconds, repeat 3 times. 5 times. Once the temperature of the hot press reaches 120℃, adjust the pressure to 20. Pre-compression at 30MPa for 15 seconds, repeat 3 times. Five times. Once the temperature of the hot press reaches 180℃, maintain the pressure and keep it at that temperature for 15 minutes. After demolding, the resin-based friction material, also known as the resin-based friction pad, is obtained.

[0033] Modified phenolic resin powder was placed in a forced-air drying oven and cured using a curing process of 150℃ / 3.0h + 180℃ / 3.0h + 210℃ / 2.5h to obtain the cured modified phenolic resin powder. Thermogravimetric analysis (TGA) of the cured modified phenolic resin powder was performed using a simultaneous thermal analyzer (STA 449F5, Netzsch Instruments GmbH, Germany). The experiment was conducted in air atmosphere, with a heating rate of 10℃ / min and a temperature range of 40℃. 800℃. Test results show that the modified phenolic resin powder cured product in Example 2... At 495.3℃ and 500℃, the remaining mass of the resin is 84.6% of the initial mass. Figure 4 As shown.

[0034] The tribological properties of different friction pairs were tested using a scaled-down automotive inertial test bench (JF120, Jilin Jida Electromechanical Equipment Co., Ltd.). The test program used was AK-master, and the test standard was SAE-J2522. Characteristic value testing and thermal degradation testing were selected from the AK-master program. Figure 5 He Ru Figure 6 As shown, in Example 2, after the resin-based friction pad is paired with the carbon ceramic disc, the coefficient of friction is 0.50, and no thermal decay occurs.

[0035] Example 3 Phenol was mixed with an alkaline catalyst and heated at 60°C. Stir at 70℃ for 0.5 seconds. After 1 hour, a first mixed product was obtained; a formaldehyde-furfural mixed solution was added dropwise to the first mixed product, and the mixture was heated at 70°C. Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained; the second mixed product was then heated to 140°C. Add phenylboronic acid at 150℃ and stir for 1 minute. Liquid modified phenolic resin was obtained after 2 hours; the pH value of the liquid modified phenolic resin was adjusted to acidic, and the mixture was vacuum treated and ground to obtain modified phenolic resin powder; the modified phenolic resin powder was mixed with reinforcing fibers, friction modifiers, friction reducers and space fillers, and hot-pressed to obtain resin-based friction material.

[0036] Specifically, 47.1g of molten phenol was added to a 250mL three-necked flask equipped with a condenser, a constant pressure dropping funnel and a stirring device, followed by 4.71g of sodium hydroxide. The reaction temperature was controlled at 60℃ and the mixture was stirred continuously for 0.5h.

[0037] Weigh 47.4g of formaldehyde and 4.8g of furfural to prepare a formaldehyde-furfural mixed solution. Add the formaldehyde-furfural mixed solution dropwise to the first mixed product, heat to 60℃, and stir continuously for 1.5h to obtain the second mixed product.

[0038] The second mixture was heated to 140°C, and 14.18 g of phenylboronic acid was added at once. The mixture was stirred continuously for 1.5 h to obtain a liquid-modified phenolic resin. The pH of the liquid-modified phenolic resin was adjusted to acidic using oxalic acid; that is, the pH value should be... 7. Place the adjusted solution into a vacuum drying oven, dry it under vacuum at 80°C for 6 hours, remove it from the vacuum drying oven and allow it to cool naturally to room temperature, then grind it into powder to obtain modified phenolic resin powder.

[0039] By weight percentage, mix 48% steel fiber, 7.5% modified phenolic resin powder, 4% silicon dioxide, 3.7% aluminum oxide, 2.6% silicon carbide, 2% titanium boride, 11.5% magnesium oxide, 3% expanded graphite, 3.2% antimony sulfide, 11% barium sulfate, and 3.5% potassium hexatitanate whiskers. Apply the release agent evenly to the mold surface, add the mixed powder, and preheat in a hot press. Once the hot press temperature reaches 80℃, adjust the pressure to 10... Pre-compression at 15 MPa for 15 seconds, repeat 3 times. 5 times. Once the temperature of the hot press reaches 120℃, adjust the pressure to 20. Pre-compression at 30MPa for 15 seconds, repeat 3 times. Five times. Once the temperature of the hot press reaches 180℃, maintain the pressure and keep it at that temperature for 15 minutes. After demolding, the resin-based friction material, also known as the resin-based friction pad, is obtained.

[0040] Modified phenolic resin powder was placed in a forced-air drying oven and cured using a curing process of 150℃ / 3.0h + 180℃ / 3.0h + 210℃ / 2.5h to obtain the cured modified phenolic resin powder. Thermogravimetric analysis (TGA) of the cured modified phenolic resin powder was performed using a simultaneous thermal analyzer (STA 449F5, Netzsch Instruments GmbH, Germany). The experiment was conducted in air atmosphere, with a heating rate of 10℃ / min and a temperature range of 40℃. 800℃. Test results show that the modified phenolic resin powder cured in Example 3... At 499.7℃ and 500℃, the remaining mass of the resin is 84.9% of the initial mass. Figure 7 As shown.

[0041] The tribological properties of different friction pairs were tested using a scaled-down automotive inertial test bench (JF120, Jilin Jida Electromechanical Equipment Co., Ltd.). The test program used was AK-master, and the test standard was SAE-J2522. Characteristic value testing and thermal degradation testing were selected from the AK-master program. Figure 8 He Ru Figure 9 As shown, in Example 3, after the resin-based friction pad is paired with the carbon ceramic disc, the coefficient of friction is 0.50, and no thermal decay occurs.

[0042] Example 4 Phenol was mixed with an alkaline catalyst and heated at 60°C. Stir at 70℃ for 0.5 seconds. After 1 hour, a first mixed product was obtained; a formaldehyde-furfural mixed solution was added dropwise to the first mixed product, and the mixture was heated at 70°C. Stir at 80℃ for 2.5 seconds. After 3 hours, a second mixed product was obtained; the second mixed product was then heated to 140°C. Add phenylboronic acid at 150℃ and stir for 1 minute. Liquid modified phenolic resin was obtained after 2 hours; the pH value of the liquid modified phenolic resin was adjusted to acidic, and the mixture was vacuum treated and ground to obtain modified phenolic resin powder; the modified phenolic resin powder was mixed with reinforcing fibers, friction modifiers, friction reducers and space fillers, and hot-pressed to obtain resin-based friction material.

[0043] Specifically, 47.1g of molten phenol was added to a 250mL three-necked flask equipped with a condenser, a constant pressure dropping funnel and a stirring device, followed by 4.71g of sodium hydroxide. The reaction temperature was controlled at 60℃ and the mixture was stirred continuously for 0.5h.

[0044] Weigh 47.4g of formaldehyde and 12g of furfural to prepare a formaldehyde-furfural mixed solution. Add the formaldehyde-furfural mixed solution dropwise to the first mixed product, heat to 70℃, and stir continuously for 2.5h to obtain the second mixed product.

[0045] The second mixture was heated to 140°C, and 14.18 g of phenylboronic acid was added at once. The mixture was stirred continuously for 1.5 h to obtain a liquid-modified phenolic resin. The pH of the liquid-modified phenolic resin was adjusted to acidic using oxalic acid; that is, the pH value should be... 7. Place the adjusted solution into a vacuum drying oven, dry it under vacuum at 80°C for 8 hours, remove it from the vacuum drying oven and allow it to cool naturally to room temperature, then grind it into powder to obtain modified phenolic resin powder.

[0046] By weight percentage, mix 48% steel fiber, 6.5% modified phenolic resin, 3.4% silicon dioxide, 3.7% aluminum oxide, 4% titanium boride, 11.5% magnesium oxide, 5% graphite, 3.2% antimony sulfide, 11.2% barium sulfate, and 3.5% potassium hexatitanate whiskers. Apply the release agent evenly to the mold surface, add the mixed powder, and preheat in a hot press. Once the hot press temperature reaches 80℃, adjust the pressure to 10... Pre-compression at 15 MPa for 15 seconds, repeat 3 times. 5 times. Once the temperature of the hot press reaches 120℃, adjust the pressure to 20. Pre-compression at 30MPa for 15 seconds, repeat 3 times. Five times. Once the temperature of the hot press reaches 180℃, maintain the pressure and keep it at that temperature for 15 minutes. After demolding, the resin-based friction material, also known as the resin-based friction pad, is obtained.

[0047] Modified phenolic resin powder was placed in a forced-air drying oven and cured using a curing process of 150℃ / 3.0h + 180℃ / 3.0h + 210℃ / 2.5h to obtain the cured modified phenolic resin powder. Thermogravimetric analysis (TGA) of the cured modified phenolic resin powder was performed using a simultaneous thermal analyzer (STA 449F5, Netzsch Instruments GmbH, Germany). The experiment was conducted in air atmosphere, with a heating rate of 10℃ / min and a temperature range of 40℃. 800℃. Test results show that the modified phenolic resin powder cured product in Example 4... At 487.0℃ and 500℃, the remaining mass of the resin is 82.5% of the initial mass. Figure 10 As shown.

[0048] The tribological properties of different friction pairs were tested using a scaled-down automotive inertial test bench (JF120, Jilin Jida Electromechanical Equipment Co., Ltd.). The test program used was AK-master, and the test standard was SAE-J2522. Characteristic value testing and thermal degradation testing were selected from the AK-master program. Figure 11 He Ru Figure 12 As shown, in Example 4, after the resin-based friction pad is paired with the carbon ceramic disc, the coefficient of friction is 0.50, and no thermal decay occurs.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

Claims

1. A method of producing a resin-based friction material, characterized by, The method comprises the following steps: Phenol is mixed with a basic catalyst at 60°C 70°C for 0.5 1 h to obtain a first mixed product; To the first mixed product, a formaldehyde-furfural mixed solution was added dropwise at 70°C 80°C for 2.5 3 h to obtain a second mixed product; heating the second mixture to 140°C 150°C, addition of phenylboronic acid, stirring for 1 2 h to obtain a liquid modified phenol-formaldehyde resin; adjusting the pH value of the liquid modified phenolic resin to be acidic, and vacuumizing to obtain modified phenolic resin powder; mixing the modified phenolic resin powder with reinforcing fibers, friction enhancer, friction reducer, and space filler, and hot-pressing to obtain resin-based friction material.

2. The method according to claim 1, wherein: The basic catalyst is sodium hydroxide, the mass of the sodium hydroxide is 0.8 1.5% The mass of the phenylboronic acid is 10% of the mass of the phenol and formaldehyde 15%.

3. The method according to claim 1, wherein: the molar ratio of phenol to formaldehyde is 1:1.2; the molar ratio of said phenol to furfural is 1 :0.1 0.

3.

4. The method according to claim 1, wherein: The weight percentage of the reinforcing fibers is 45 50%; The modified phenol formaldehyde resin powder has a weight percentage of 6 9% the weight percentage of the friction modifier is 25 30% the weight percentage of the friction reducing agent is 5 10% The weight percentage of the space filler is 10 15%.

5. The method according to claim 1, wherein: the reinforcing fibers are one or a mixture of steel fibers, carbon fibers, basalt fibers, silicon carbide fibers, and aluminum oxide fibers.

6. The method according to claim 1, wherein: the friction enhancer is one or a mixture of aluminum oxide, zirconium silicate, titanium boride, chromium sesquioxide, silicon carbide, silicon dioxide, and light magnesium oxide.

7. The method according to claim 1, wherein: the friction reducer is one or a mixture of graphite, expanded graphite, hexagonal boron nitride, tin disulfide, stannous sulfide, tin, molybdenum disulfide, antimony sulfide, and aluminum.

8. The method according to claim 1, wherein: the space filler is one or a mixture of barium sulfate, coke, vermiculite, graphene nanosheet, calcium metasilicate, potassium hexatitanate whisker, and talc.

9. The method according to claim 1, wherein: the hot-pressing comprises first hot-pressing, second hot-pressing, and third hot-pressing; The first heat pressing temperature is 80℃, the pressure is 10 15MPa, the time is 15s, and the repetition is 3 5 times. The second heat pressing temperature is 120 °C, the pressure is 20 30 MPa, the time is 15 s, and the repetition is 3 5 times. The temperature of the third heat pressing is 180 °C, the pressure is 20 30 MPa, and the time is 15 min.

10. A friction plate, characterized by the friction plate is made of the resin-based friction material according to any one of claims 1-9.

Images