Resin-based friction plate for aluminum ceramic brake disc and preparation method of resin-based friction plate

Abstract

The invention relates to the technical field of friction plates for vehicles, and particularly discloses a resin-based friction plate for an aluminum-ceramic brake disc and a preparation method of the resin-based friction plate for the aluminum-ceramic brake disc. Steel fibers serve as a main reinforcing phase, the structural strength of the material is improved, and meanwhile the steel fibers are good friction increasing materials; the reduced iron powder can improve the heat-conducting property of the brake pad and reduce the decline of the friction coefficient at high temperature; the red copper powder and the brass powder are good lubricants, the stability of single braking can be improved, and meanwhile abrasion is reduced; the silicon carbide mainly plays a role in increasing the high-temperature friction coefficient; molybdenum disulfide is beneficial for improving the recovery performance after high-temperature decline and reducing abrasion; antimony sulfide is lubricated at high temperature, and the friction coefficient in the decline stage is increased; silicon carbide is a high-hardness material, so that the friction coefficient is increased; the potassium magnesium titanate lamellar crystal improves the damping characteristic of the material and absorbs vibration and reduces noise, and the resin-based friction plate has the advantages of being high in strength, good in heat conduction, stable in friction performance, resistant to abrasion, comfortable in braking and the like and meets the use requirement of an aluminum ceramic brake disc.

Description

Technical Field

[0001] This invention relates to the field of automotive friction pad technology, specifically to a resin-based friction pad for aluminum-ceramic brake discs and its preparation method. Background Technology

[0002] Aluminum-ceramic brake discs are manufactured using advanced aluminum-ceramic composite materials. This combination retains the high-temperature resistance and high hardness of ceramics while significantly reducing the weight of the brake disc—approximately 30-40% lighter than traditional cast iron discs. This reduces unsprung mass, improving acceleration performance, handling agility, and vehicle range. Furthermore, aluminum-ceramic discs are water-resistant and more aesthetically pleasing than traditional cast iron discs. With the booming development of new energy vehicles in China, the increasing demands for lightweight design, and the continuous reduction in the production cost of aluminum-ceramic discs, aluminum-ceramic brakes are poised for a significant market expansion.

[0003] Although the development and application of aluminum-ceramic brake discs are becoming increasingly mature, research on matching resin-based brake pads is scarce. Since the hardness of aluminum-ceramic brake discs is typically between HB100-150, while the hardness of traditional cast iron discs is typically between HB200-250, using the friction material of traditional cast iron discs on aluminum-ceramic discs results in a lower coefficient of friction and greater wear, failing to guarantee safe and effective braking.

[0004] Therefore, in order to fully utilize the advantages of aluminum ceramic brake pads, it is urgent to develop a high-temperature resistant and wear-resistant resin-based brake pad that can match the aluminum ceramic brake pads. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a resin-based friction pad for aluminum-ceramic brake discs and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A resin-based friction pad for aluminum-ceramic brake discs, comprising, by weight, the following raw materials: 10-15 parts phenolic resin composite material, 2-5 parts aramid pulp, 5-8 parts iron(III) oxide, 2-4 parts magnesium oxide, 10-15 parts steel fiber, 10-15 parts reduced iron powder, 2-6 parts nickel powder, 4-8 parts copper powder, 4-8 parts brass powder, 2-6 parts antimony trisulfide, 2-6 parts molybdenum disulfide, 4-8 parts alumina, 4-8 parts silicon carbide, 8-12 parts potassium magnesium titanate flakes, 4-6 parts sericite, and 2-5 parts vermiculite.

[0007] In the technical solution disclosed in this invention, the preparation method of the phenolic resin composite material is as follows: S1. Disperse nano-silica in an ethanol aqueous solution using ultrasonication, then add a vinyl silane coupling agent and stir to obtain double bond modified nano-silica. S2. Allyl phenolic resin, N-vinyl imidazole and 1,4-butenediol are dissolved in acetone, double bond modified nano silica is added, and the mixture is ultrasonically dispersed evenly. Then, dicumyl peroxide initiator is added, and the mixture is transferred to a reaction vessel for reaction. After the reaction is completed, the acetone is removed to obtain the phenolic resin composite material.

[0008] Specifically, in step S1, the mass ratio of the nano-silica to the vinyl silane coupling agent is 5-10:1-3. For example, 5:1, 5:2, 5:3, 8:1, 8:1.5, 8:3, 10:1, 10:2.5, and 10:3 can be selected, but are not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0009] More specifically, the vinyl silane coupling agent is selected from vinyltrimethoxysilane, vinyltriethoxysilane, or vinyltri(β-methoxyethoxy)silane.

[0010] Specifically, in step S2, the mass ratio of allyl phenolic resin, N-vinyl imidazole, 1,4-butenediol, double bond modified nano silica, and dicumyl peroxide is 20-40:10-20:10-20:5-10:1-2.

[0011] Specifically, in step S2, the reaction temperature is 100-120℃, for example, 100℃, 105℃, 110℃, 115℃, or 120℃ can be selected; the reaction time is 1-2h, for example, 1h, 1.5h, or 2h can be selected, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0012] In the technical solution disclosed in this invention, under the action of the initiator dicumyl peroxide, allyl phenolic resin, N-vinylimidazolium, 1,4-butenediol, and double-bond modified nano-silica undergo a copolymerization reaction. The nano-silica is chemically bonded to the polymer network, greatly enhancing the interfacial bonding force, effectively transferring stress, and significantly improving the mechanical properties and wear resistance of the phenolic resin composite material. N-vinylimidazolium is a compound containing vinyl active groups and imidazolium heterocycles, which can improve the heat resistance of phenolic resin, making the brake pads significantly more resistant to thermal fading under the high temperature environment generated by continuous high-intensity braking, and the high-temperature friction coefficient is more stable. At the same time, the imidazolium group also has a certain extreme pressure lubrication and friction regulation effect. The flexible segments of 1,4-butenediol balance the excessive rigidity introduced by nano-SiO2 and N-vinylimidazolium, preventing the material from becoming too brittle, ensuring the necessary toughness of the phenolic resin composite material to withstand the impact, shear, and vibration during braking, and avoiding the risk of cracking.

[0013] In the technical solution disclosed in this invention, the number of parts of the phenolic resin composite material can be selected as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0014] In the technical solution disclosed in this invention, the number of parts of aramid pulp can be 2, 3, 4, or 5, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0015] In the technical solution disclosed in this invention, the amount of iron(III) oxide can be 5 parts, 6 parts, 7 parts, or 8 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0016] In the technical solution disclosed in this invention, the amount of magnesium oxide can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] In the technical solution disclosed in this invention, the number of steel fibers can be selected as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0018] In the technical solution disclosed in this invention, the amount of reduced iron powder can be selected as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0019] In the technical solution disclosed in this invention, the number of parts of nickel powder can be 2, 3, 4, 5, or 6, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0020] In the technical solution disclosed in this invention, the amount of copper powder can be 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] In the technical solution disclosed in this invention, the amount of brass powder can be 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] In the technical solution disclosed in this invention, the amount of antimony trisulfide can be 2 parts, 3 parts, 4 parts, 5 parts, or 6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] In the technical solution disclosed in this invention, the number of parts of molybdenum disulfide can be 2 parts, 3 parts, 4 parts, 5 parts, or 6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0024] In the technical solution disclosed in this invention, the amount of alumina can be 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] In the technical solution disclosed in this invention, the number of parts of silicon carbide can be 4, 5, 6, 7, or 8, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0026] In the technical solution disclosed in this invention, the number of potassium magnesium titanate flakes can be 8 parts, 9 parts, 10 parts, 11 parts, or 12 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0027] In the technical solution disclosed in this invention, the number of parts of sericite can be 4, 4.5, 5, 5.5, or 6, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0028] In the technical solution disclosed in this invention, the amount of vermiculite can be 2 parts, 3 parts, 4 parts, or 5 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] The present invention also provides a method for preparing the above-mentioned resin-based friction pad for aluminum-ceramic brake discs, comprising the following steps: weighing raw materials according to the formula, adding each raw material to a high-speed mixer and mixing them evenly to obtain a blend, then adding the blend to a mold for pressing, and then performing heat treatment to obtain the resin-based friction pad for aluminum-ceramic brake discs.

[0030] In the technical solution disclosed in this invention, the specific pressing process is as follows: pressing pressure 300-450 kg / cm². 2 The hot pressing temperature is 150-160℃, the pressure holding time is 5-10s, the venting time is 0-5s, the venting time is 5-8 times, and the pressure holding time is 240-420s.

[0031] In the technical solution disclosed in this invention, the specific process of heat treatment is: holding at 190-200℃ for 6-10 hours.

[0032] Compared with the prior art, the present invention has the following beneficial effects: (1) The resin-based friction pad for aluminum-ceramic brake discs provided by the present invention exhibits good mechanical properties and wear resistance through the synergistic combination of various functional components. Steel fiber is the main reinforcing phase, which improves the structural strength of the material and is also a good friction-enhancing material; reduced iron powder can improve the thermal conductivity of the brake pad and reduce the friction coefficient decay at high temperature; copper powder and brass powder are good lubricants, which can improve the stability of single braking and reduce wear; silicon carbide mainly plays the role of increasing the friction coefficient at high temperature; molybdenum disulfide helps to improve the recovery performance after high temperature decay and reduce wear; antimony sulfide provides high-temperature lubrication and improves the friction coefficient in the decay stage; silicon carbide is a high-hardness material and improves the friction coefficient; potassium magnesium titanate flakes improve the damping characteristics of the material, absorb vibration and reduce noise. The resin-based friction pad provided by the present invention has the characteristics of high strength, good thermal conductivity, stable friction performance, wear resistance and braking comfort, and is suitable for the use requirements of aluminum-ceramic brake discs.

[0033] (2) The phenolic resin composite material provided by the present invention undergoes a copolymerization reaction between allyl phenolic resin, N-vinylimidazol, 1,4-butenediol and double bond modified nano silica under the action of the initiator dicumyl peroxide. The nano silica is bonded to the polymer network in the form of chemical bonds, which greatly enhances the interfacial bonding force, effectively transmits stress, and significantly improves the mechanical properties and wear resistance of the phenolic resin composite material. N-vinylimidazol is a compound containing vinyl active groups and imidazolium heterocycles, which can improve the heat resistance of phenolic resin, so that the brake pads have a significantly enhanced ability to resist thermal decay under the high temperature environment generated by continuous high-intensity braking, and the high temperature friction coefficient is more stable. At the same time, the imidazolium group also has a certain extreme pressure lubrication and friction regulation effect. The flexible segments of 1,4-butenediol balance the excessive rigidity introduced by nano SiO2 and N-vinylimidazol, prevent the material from becoming too brittle, ensure the necessary toughness of the phenolic resin composite material to withstand the impact, shear and vibration during the braking process, and avoid the risk of cracking. Attached Figure Description

[0034] Figure 1 This is a physical image of the resin-based friction pad for the aluminum-ceramic brake disc prepared in Example 1 of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0036] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0037] The CAS number of the allyl phenolic resin is 68186-14-1, sourced from Puyang Weilin Technology Development Co., Ltd.; the aramid pulp is sourced from Shanghai Lishuo Composite Materials Technology Co., Ltd.; the steel fiber is model D1-80; the purity of iron tetroxide, magnesium oxide, reduced iron powder, nickel powder, copper powder, brass powder, antimony trisulfide, molybdenum disulfide, alumina, and silicon carbide is ≥99%; the particle size of iron tetroxide, magnesium oxide, reduced iron powder, and nickel powder is less than 45μm; the particle size of copper powder and brass powder is less than 75μm; the particle size of alumina and silicon carbide is less than 13μm; the particle size of antimony trisulfide and molybdenum disulfide is less than 75μm; the particle size of potassium magnesium titanate flakes is less than 75μm; the particle size of sericite and vermiculite is less than 75μm.

[0038] Example 1 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: Ten parts of phenolic resin composite material, two parts of aramid pulp, five parts of iron oxide, two parts of magnesium oxide, ten parts of steel fiber, ten parts of reduced iron powder, two parts of nickel powder, four parts of copper powder, four parts of brass powder, two parts of antimony trisulfide, two parts of molybdenum disulfide, four parts of alumina, four parts of silicon carbide, eight parts of potassium magnesium titanate flakes, four parts of sericite, and two parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0039] The preparation method of the phenolic resin composite material is as follows: S1. Disperse 5g of nano-silica ultrasonically in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 4:1), then add 1g of vinyltriethoxysilane, stir at room temperature for 2h, filter, wash and dry to obtain double bond modified nano-silica. S2. Dissolve 20g of allyl phenolic resin, 10g of N-vinylimidazolium and 10g of 1,4-butenediol in 400mL of acetone, add 5g of double bond modified nano silica, and ultrasonically disperse evenly. Then add 1g of initiator dicumyl peroxide, transfer to a reaction vessel for reaction, the reaction temperature is 105℃ and the reaction time is 1h. After the reaction is completed, remove the acetone to obtain the phenolic resin composite material.

[0040] Example 2 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: 15 parts of phenolic resin composite material, 5 parts of aramid pulp, 6 parts of iron oxide, 3 parts of magnesium oxide, 12 parts of steel fiber, 15 parts of reduced iron powder, 5 parts of nickel powder, 6 parts of copper powder, 8 parts of brass powder, 5 parts of antimony trisulfide, 4 parts of molybdenum disulfide, 6 parts of alumina, 8 parts of silicon carbide, 12 parts of potassium magnesium titanate flakes, 5 parts of sericite, and 4 parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0041] The preparation method of the phenolic resin composite material is as follows: S1. Disperse 8g of nano-silica ultrasonically in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 4:1), then add 2g of vinyltriethoxysilane, stir at room temperature for 2h, filter, wash and dry to obtain double bond modified nano-silica. S2. Dissolve 30g of allyl phenolic resin, 10g of N-vinylimidazolium and 20g of 1,4-butenediol in 400mL of acetone, add 8g of double bond modified nano silica, and ultrasonically disperse evenly. Then add 1.5g of initiator dicumyl peroxide, transfer to a reaction vessel for reaction, the reaction temperature is 105℃ and the reaction time is 1h. After the reaction is completed, remove the acetone to obtain the phenolic resin composite material.

[0042] Example 3 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: 12 parts of phenolic resin composite material, 4 parts of aramid pulp, 8 parts of iron oxide, 4 parts of magnesium oxide, 15 parts of steel fiber, 12 parts of reduced iron powder, 6 parts of nickel powder, 8 parts of copper powder, 5 parts of brass powder, 6 parts of antimony trisulfide, 6 parts of molybdenum disulfide, 8 parts of alumina, 6 parts of silicon carbide, 10 parts of potassium magnesium titanate flakes, 6 parts of sericite, and 5 parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0043] The preparation method of the phenolic resin composite material is as follows: S1. 10g of nano-silica was ultrasonically dispersed in 100mL of ethanol aqueous solution (volume ratio of ethanol to water is 4:1), and then 3g of vinyltriethoxysilane was added. The mixture was stirred at room temperature for 2h, filtered, washed and dried to obtain double bond modified nano-silica. S2. Dissolve 40g of allyl phenolic resin, 20g of N-vinylimidazolium and 15g of 1,4-butenediol in 400mL of acetone, add 10g of double bond modified nano silica, and ultrasonically disperse evenly. Then add 2g of initiator dicumyl peroxide, transfer to a reaction vessel for reaction, the reaction temperature is 105℃ and the reaction time is 1h. After the reaction is completed, remove the acetone to obtain the phenolic resin composite material.

[0044] Comparative Example 1 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: Ten parts of allyl phenolic resin, two parts of aramid pulp, five parts of iron oxide, two parts of magnesium oxide, ten parts of steel fiber, ten parts of reduced iron powder, two parts of nickel powder, four parts of copper powder, four parts of brass powder, two parts of antimony trisulfide, two parts of molybdenum disulfide, four parts of alumina, four parts of silicon carbide, eight parts of potassium magnesium titanate flakes, four parts of sericite, and two parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0045] Compared with Example 1, no modification treatment was performed on the allylphenol resin in Comparative Example 1.

[0046] Comparative Example 2 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: Ten parts of phenolic resin composite material, two parts of aramid pulp, five parts of iron oxide, two parts of magnesium oxide, ten parts of steel fiber, ten parts of reduced iron powder, two parts of nickel powder, four parts of copper powder, four parts of brass powder, two parts of antimony trisulfide, two parts of molybdenum disulfide, four parts of alumina, four parts of silicon carbide, eight parts of potassium magnesium titanate flakes, four parts of sericite, and two parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0047] The preparation method of the phenolic resin composite material is as follows: 20g of allyl phenolic resin, 10g of N-vinylimidazole and 10g of 1,4-butenediol were dissolved in 400mL of acetone, and then 1g of initiator dicumyl peroxide was added. The mixture was then transferred to a reaction vessel for reaction at 105℃ for 1h. After the reaction was completed, the acetone was removed to obtain the phenolic resin composite material.

[0048] Compared with Example 1, no double bond modified nano-silica was added in Comparative Example 2.

[0049] Comparative Example 3 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: Ten parts of phenolic resin composite material, two parts of aramid pulp, five parts of iron oxide, two parts of magnesium oxide, ten parts of steel fiber, ten parts of reduced iron powder, two parts of nickel powder, four parts of copper powder, four parts of brass powder, two parts of antimony trisulfide, two parts of molybdenum disulfide, four parts of alumina, four parts of silicon carbide, eight parts of potassium magnesium titanate flakes, four parts of sericite, and two parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0050] The preparation method of the phenolic resin composite material is as follows: S1. Disperse 5g of nano-silica ultrasonically in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 4:1), then add 1g of vinyltriethoxysilane, stir at room temperature for 2h, filter, wash and dry to obtain double bond modified nano-silica. S2. Dissolve 20g of allyl phenolic resin and 10g of 1,4-butenediol in 400mL of acetone, add 5g of double bond modified nano silica, and ultrasonically disperse evenly. Then add 1g of initiator dicumyl peroxide, transfer to a reaction vessel for reaction, the reaction temperature is 105℃, the reaction time is 1h. After the reaction is completed, remove the acetone to obtain the phenolic resin composite material.

[0051] Compared with Comparative Example 3 and Example 1, no N-vinylimidazole was added.

[0052] Comparative Example 4 A method for preparing a resin-based friction pad for an aluminum-ceramic brake disc includes the following steps: Ten parts of phenolic resin composite material, two parts of aramid pulp, five parts of iron oxide, two parts of magnesium oxide, ten parts of steel fiber, ten parts of reduced iron powder, two parts of nickel powder, four parts of copper powder, four parts of brass powder, two parts of antimony trisulfide, two parts of molybdenum disulfide, four parts of alumina, four parts of silicon carbide, eight parts of potassium magnesium titanate flakes, four parts of sericite, and two parts of vermiculite were added to a high-speed mixer. The spindle speed was 150 r / min, the cutter speed was 2800 r / min, and the mixing time was 15 min to obtain a blend. The blend was then added to a mold and pressed at a pressure of 400 kg / cm². 2 The hot pressing temperature is 155℃, the pressure holding time is 8s, the venting time is 3s, the venting time is 6 times, the pressure holding time is 360s, and then the formed friction pad is heated from room temperature to 200℃ in 3h, held at that temperature for 8h, and then cooled to room temperature in the furnace to obtain the resin-based friction pad for aluminum ceramic brake disc.

[0053] The preparation method of the phenolic resin composite material is as follows: S1. Disperse 5g of nano-silica ultrasonically in 100mL of ethanol aqueous solution (ethanol to water volume ratio of 4:1), then add 1g of vinyltriethoxysilane, stir at room temperature for 2h, filter, wash and dry to obtain double bond modified nano-silica. S2. Dissolve 20g of allyl phenolic resin and 10g of N-vinyl imidazole in 400mL of acetone, add 5g of double bond modified nano silica, and ultrasonically disperse evenly. Then add 1g of initiator dicumyl peroxide, transfer to a reaction vessel for reaction, the reaction temperature is 105℃, the reaction time is 1h, and after the reaction is completed, remove the acetone to obtain the phenolic resin composite material.

[0054] Compared with Example 1, no 1,4-butenediol was added in Comparative Example 4.

[0055] The friction plates prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests, as detailed below: Impact strength was tested according to standard GB / T 33835-2017 "Test Method for Impact Strength of Friction Materials"; Wear was tested according to standard GB 5763-2018 "Automotive Brake Liners"; The test results are shown in Table 1.

[0056] Table 1 Performance test results of each group of friction plates

[0057] As can be seen from Table 1, the present invention introduces N-vinylimidazol, 1,4-butenediol and double-bond modified nano-silica into allylphenolic resin, which is beneficial to improving the impact resistance and wear resistance of brake pads.

[0058] The friction pads prepared in Example 1 of this invention were subjected to performance testing according to the international standard SAE J2522-2003. The main test results are shown in Table 2.

[0059] Table 2 Performance test results of the friction plates prepared in Example 1

[0060] As can be seen from Table 2, the friction plate prepared in Example 1 of the present invention has a minimum friction coefficient of 0.26, a nominal friction coefficient of 0.40, an inner wear of 0.41 mm, and an outer wear of 0.31 mm. The friction coefficient is stable and the wear is low.

[0061] The friction pad prepared in Example 1 of the present invention was subjected to AMS testing, and the main test results are shown in Table 3.

[0062] Table 3. AMS test results of the friction plates prepared in Example 1.

[0063] As can be seen from Table 3, the friction plate prepared in Example 1 of the present invention has a minimum friction coefficient of 0.23, exhibits excellent thermal decay performance, and meets the requirement of a minimum friction coefficient greater than 0.20 for passenger vehicles' AMS.

[0064] Finally, it should be noted that the above embodiments do not limit the present invention in any way. Those skilled in the art can make modifications and improvements based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A resin-based friction pad for aluminum-ceramic brake discs, characterized in that, The raw materials, by weight, include the following components: 10-15 parts phenolic resin composite material, 2-5 parts aramid pulp, 5-8 parts iron oxide, 2-4 parts magnesium oxide, 10-15 parts steel fiber, 10-15 parts reduced iron powder, 2-6 parts nickel powder, 4-8 parts copper powder, 4-8 parts brass powder, 2-6 parts antimony trisulfide, 2-6 parts molybdenum disulfide, 4-8 parts alumina, 4-8 parts silicon carbide, 8-12 parts potassium magnesium titanate flakes, 4-6 parts sericite, and 2-5 parts vermiculite. The preparation method of the phenolic resin composite material is as follows: S1. Disperse nano-silica in an ethanol aqueous solution using ultrasonication, then add a vinyl silane coupling agent and stir to obtain double bond modified nano-silica. S2. Allyl phenolic resin, N-vinyl imidazole and 1,4-butenediol are dissolved in acetone, double bond modified nano silica is added, and the mixture is ultrasonically dispersed evenly. Then, dicumyl peroxide initiator is added, and the mixture is transferred to a reaction vessel for reaction. After the reaction is completed, the acetone is removed to obtain the phenolic resin composite material.

2. The resin-based friction pad for aluminum-ceramic brake discs according to claim 1, characterized in that, In step S1, the mass ratio of the nano-silica to the vinylsilane coupling agent is 5-10:1-3.

3. The resin-based friction pad for aluminum-ceramic brake discs according to claim 1, characterized in that, In step S1, the vinyl silane coupling agent is selected from vinyltrimethoxysilane, vinyltriethoxysilane, or vinyltri(β-methoxyethoxy)silane.

4. The resin-based friction pad for aluminum-ceramic brake discs according to claim 1, characterized in that, In step S2, the mass ratio of allyl phenolic resin, N-vinyl imidazole, 1,4-butenediol, double bond modified nano silica, and dicumyl peroxide is 20-40:10-20:10-20:5-10:1-2.

5. The resin-based friction pad for aluminum-ceramic brake discs according to claim 1, characterized in that, In step S2, the reaction temperature is 100-120℃ and the reaction time is 1-2 hours.

6. The method for preparing the resin-based friction pad for aluminum-ceramic brake discs as described in any one of claims 1-5, characterized in that, The process includes the following steps: weighing the raw materials according to the formula, adding each raw material to a high-speed mixer and mixing them evenly to obtain a blend, then adding the blend to a mold for pressing, and then heat treating it to obtain the resin-based friction pad for the aluminum-ceramic brake disc.

7. The preparation method according to claim 6, characterized in that, The specific pressing process is as follows: pressing pressure 300-450 kg / cm² 2 The hot pressing temperature is 150-160℃, the pressure holding time is 5-10s, the venting time is 0-5s, the venting time is 5-8 times, and the pressure holding time is 240-420s.

8. The preparation method according to claim 6, characterized in that, The specific process for heat treatment is to hold at 190-200℃ for 6-10 hours.

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