Fiber reinforced composite material, brake pad, preparation method and application

Abstract

The invention belongs to the technical field of brake pads, and particularly relates to a fiber reinforced composite material, a brake pad, a preparation method and application. The fiber reinforced composite material is prepared from the following raw materials in parts by mass: 31 to 39 parts of carbon fiber modified phenolic resin, 30 to 35 parts of organic silicon modified phenolic resin, 37 to 61 parts of reinforced fiber, 19 to 31 parts of modified silicon polymer and 20 to 45 parts of filler. The modified silicon polymer of a specific structure is matched with multiple other specific components, so that the brake pad prepared from the fiber reinforced composite material has excellent comprehensive performance, and meanwhile, the fiber reinforced composite material is stable in performance and convenient to prepare into the brake pad, so that the service life of the brake pad is prolonged, and the service life of the brake pad is prolonged. The preparation process is simple and reliable.

Description

Technical Field

[0001] The present application belongs to the technical field of brake pads, and specifically relates to a fiber-reinforced composite material, a brake pad, and a preparation method and application thereof. Background Art

[0002] With the continuous advancement of the automotive industry, the demand for brake pads is increasing. Traditional brake pad formulations are essentially multi-component composite materials, consisting of four main components: binder, reinforcing fiber, friction modifier, and filler. However, with technological advancements, brake pad formulations have evolved from asbestos-based systems, which were phased out due to their carcinogenicity and poor thermal conductivity. Following the market exit of steel wool and resin formulations due to noise and corrosion, the market has gradually transitioned to a combination of composite fibers and modified resins, which comprehensively enhance the performance of brake pads.

[0003] However, in the current technical system of combining composite fibers and modified resins, there is still much room for improvement, such as reducing noise to improve user experience, and improving shock absorption effect to avoid resonance of brake pads during use.

[0004] Therefore, in the face of the ever-increasing market demands, it is necessary to provide a fiber-reinforced composite material with superior performance to prepare brake pads. Summary of the Invention

[0005] The purpose of this application is to address at least one of the deficiencies of the prior art and to provide a fiber-reinforced composite material, a brake pad, and a preparation method and application thereof, specifically employing the following technical solutions: First, the present application provides a fiber-reinforced composite material, the raw materials of which include, by weight: 31-39 parts of carbon fiber modified phenolic resin, 30-35 parts of organosilicon modified phenolic resin, 37-61 parts of reinforcing fiber, 19-31 parts of modified silicone polymer, and 20-45 parts of filler; The preparation method of the modified silicon polymer comprises the following steps: Under the protection of inert gas, maintain the temperature at -7°C to -13°C, mix methylphenyldichlorosilane and dimethyldiethoxysilane, slowly add ethylvinyldichlorosilane and mix, then warm to room temperature and stir for 5h-10h, then add trimethylchlorosilane and react fully, then add water and heat to 80°C-85°C until the reaction is complete, then adjust the pH to neutral, and purify to obtain a modified silicon polymer; the mass ratio of methylphenyldichlorosilane, dimethyldiethoxysilane and ethylvinyldichlorosilane is (10-11): (6-8): (7-9).

[0006] The fiber-reinforced composite material provided by the present application is added with a modified silicone polymer prepared by a specific method, thereby improving the compatibility of the various components in the raw materials, and further improving the comprehensive performance of the specific overall material, making the mixing between the various components in the carbon fiber-reinforced composite material provided by the present application more uniform, and making the filler evenly dispersed, avoiding the unevenness and other conditions that exist in the traditional technology processing process, and also improving the shock absorption performance of the brake pad and reducing noise.

[0007] In some specific implementations, the method for preparing the carbon fiber modified phenolic resin includes the following steps: Oxidized carbon fibers are modified with a phthalate coupling agent to obtain modified carbon fibers. The modified carbon fibers are then mixed with a first phenolic resin intermediate product and allowed to fully react to obtain a carbon fiber-modified phenolic resin. The preparation method of the first phenolic resin intermediate product comprises the following steps: mixing phenol and a 35%-40% formaldehyde aqueous solution at a mass ratio of (3-4):(1-1.5), adding oxalic acid, and reacting at 90°C-110°C for 2-3 hours. In some specific implementations, the mass ratio of the modified carbon fibers to the first phenolic resin intermediate product is:(3-5):(11-13).

[0008] In this application, a carbon fiber-modified phenolic resin prepared by a specific method is also added. The addition of this material further improves the comprehensive performance of the fiber-reinforced composite material provided by this application, so that the fiber-reinforced composite material provided by this application has better braking performance after being made into brake pads.

[0009] In some specific implementations, the preparation method of the organosilicon-modified phenolic resin includes the following steps: The organosilicon monomer, phenol, formaldehyde, and catalyst are reacted at 150-170°C for 4-5 hours, then cooled to 85-95°C, paraformaldehyde is added, and after stirring, the reaction is completed at 105-115°C. The pH is then adjusted to 6.5-7.5, and the reaction is then dehydrated. In some specific embodiments, the catalyst includes at least one of hydrochloric acid, sulfuric acid, oxalic acid, phosphoric acid, glacial acetic acid, and boric acid; and the organosilicon monomer includes at least one of ethyl orthosilicate or butyltrimethoxysilane.

[0010] In the fiber-reinforced composite material provided in the present application, the organosilicon-modified phenolic resin synthesized by a specific method can produce a synergistic effect with the modified silicone polymer provided in the present application, further improving the comprehensive performance of the modified silicone polymer provided in the present application after being made into brake pads.

[0011] In some specific implementations, the filler includes at least one of barite, vermiculite, sepiolite, corundum, zircon, graphite, talc, wollastonite, zeolite, diatomaceous earth, and brucite. The reinforcing fiber includes at least one of metal fiber, aramid fiber, polyester fiber, carbon fiber, hemp fiber, paper fiber, glass fiber, or silica wool fiber.

[0012] Secondly, the present application also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically comprises the following steps: The carbon fiber modified phenolic resin, the silicone modified phenolic resin, the reinforcing fiber, the modified silicone polymer, the filler and the additive are fully mixed, followed by cold pressing and then sintering; The additives include at least one of a curing agent, a lubricant and a silane coupling agent. The fiber-reinforced composite material provided by the present application has stable performance, is easy to process, and is suitable for mass production.

[0013] Again, the present application also provides a brake pad made of the above-mentioned fiber-reinforced composite material.

[0014] Finally, this application also provides an application of the above-mentioned brake pad in new energy vehicles.

[0015] The beneficial effects of the present application are as follows: the present application provides a fiber-reinforced composite material with a specific formula, which contains a modified silicone polymer with a specific structure synthesized by a specific method, so that the fiber-reinforced composite material provided by the present application has relatively superior comprehensive performance after being prepared into a brake pad. At the same time, the fiber-reinforced composite material provided by the present application has stable performance, is easy to prepare into a brake pad, and the preparation process is simple and reliable. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments to clearly and completely describe the concept and technical effects of this application so that you can fully understand the purpose, scheme and effects of this application. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.

[0017] Example 1 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by weight ratio, carbon fiber: aramid fiber = 3:1), 25 parts of modified silicone polymer, and 35 parts of filler (by weight ratio, vermiculite, sepiolite, corundum = 1:2:1). The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0018] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0019] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0020] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0021] Example 2 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 39 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by weight ratio, carbon fiber:aramid fiber = 3:1), 25 parts of modified silicone polymer, and 45 parts of filler (by weight ratio, vermiculite, sepiolite, corundum = 1:2:1). The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0022] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0023] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0024] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0025] Example 3 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by weight ratio, carbon fiber: aramid fiber = 3:1), 31 parts of modified silicone polymer, and 35 parts of filler (by weight ratio, vermiculite, sepiolite, corundum = 1:2:1). The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0026] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0027] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0028] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0029] Example 4 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 61 parts of reinforcing fiber (by weight ratio, carbon fiber: aramid fiber = 3:1), 25 parts of modified silicone polymer, and 35 parts of filler (by weight ratio, vermiculite, sepiolite, corundum = 1:2:1). The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0030] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0031] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0032] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0033] Example 5 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by weight ratio, carbon fiber: aramid fiber = 3:1), 25 parts of modified silicone polymer, and 35 parts of filler (by weight ratio, vermiculite, sepiolite, corundum = 1:2:1). The preparation method of the modified silicon polymer is as follows: In parts by mass, 11 parts of methylphenyldichlorosilane and 6 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 7 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen protection was maintained at -10°C. After the addition was completed, the temperature was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, the temperature was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, the temperature was cooled to room temperature, and sodium bicarbonate aqueous solution was added until the pH was 7. The mixture was then filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0034] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0035] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0036] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0037] Example 6 First, in this embodiment, a fiber-reinforced composite material is provided, wherein the raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (carbon fiber), 25 parts of modified silicone polymer, and 35 parts of filler (vermiculite); The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0038] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0039] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0040] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0041] Comparative Example 1 First, in this comparative example, a fiber-reinforced composite material is provided, wherein the raw materials thereof include, by mass: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by mass ratio, carbon fiber:aramid fiber = 3:1), and 35 parts of filler (by mass ratio, vermiculite, sepiolite, corundum = 1:2:1); The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0042] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0043] Secondly, in this comparative example, a method for preparing the above-mentioned fiber-reinforced composite material is also provided, which specifically comprises the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0044] Comparative Example 2 First, in this comparative example, a fiber-reinforced composite material is provided, the raw materials of which include, by mass: 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by mass ratio, carbon fiber: aramid fiber = 3:1), 25 parts of modified silicon polymer, and 35 parts of filler (by mass ratio, vermiculite, sepiolite, corundum = 1:2:1); The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this comparative example.

[0045] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0046] Secondly, in this comparative example, a method for preparing the above-mentioned fiber-reinforced composite material is also provided, which specifically comprises the following steps: The above-mentioned organosilicon-modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, and then cold-pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0047] Comparative Example 3 First, in this comparative example, a fiber-reinforced composite material is provided, the raw materials of which include, by mass: 35 parts of carbon fiber-modified phenolic resin, 51 parts of reinforcing fiber (by mass ratio, carbon fiber: aramid fiber = 3:1), 25 parts of modified silicone polymer, and 35 parts of filler (by mass ratio, vermiculite, sepiolite, corundum = 1:2:1); The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this comparative example.

[0048] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0049] Secondly, in this comparative example, a method for preparing the above-mentioned fiber-reinforced composite material is also provided, which specifically comprises the following steps: The carbon fiber modified phenolic resin, reinforcing fiber, modified silicone polymer, filler and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0050] Comparative Example 4 First, in this embodiment, a fiber-reinforced composite material is provided. The raw materials thereof include, by weight: 35 parts of carbon fiber-modified phenolic resin, 33 parts of organosilicon-modified phenolic resin, 51 parts of reinforcing fiber (by weight ratio, carbon fiber:aramid fiber = 3:1), and 25 parts of modified silicone polymer; The preparation method of the modified silicon polymer is as follows: In parts by mass, 10 parts of methylphenyldichlorosilane and 7 parts of dimethyldiethoxysilane were dissolved in toluene and mixed, and then stirred rapidly. At the same time, 8 parts of ethylvinyldichlorosilane were slowly added dropwise thereto. During this process, nitrogen was protected and the temperature was maintained at -10°C. After the addition was completed, it was slowly raised to room temperature and stirred for 10 hours. Then, the temperature was cooled to -5°C and 3 parts of trimethylchlorosilane were slowly added dropwise. After the addition was completed, it was slowly raised to room temperature and stirred for 4 hours. Then, 7 parts of water were added and stirred at 80°C for 5 hours. Then, it was cooled to room temperature and sodium bicarbonate aqueous solution was added until the pH = 7. Then, it was filtered, and the organic phase was purified and concentrated to obtain the modified silicon polymer provided in this embodiment.

[0051] The preparation method of carbon fiber modified phenolic resin is as follows: The oxidized carbon fiber was modified by a phthalate coupling agent to obtain modified carbon fiber; phenol and a 35% formaldehyde aqueous solution were mixed in a mass ratio of 3.5:1, oxalic acid was added, and the mixture was reacted at 100°C for 3 hours to obtain an intermediate product with a first phenolic resin; then, 4 parts by mass of the modified carbon fiber were taken and mixed with 11 parts of the first phenolic resin intermediate product for blending modification.

[0052] The preparation method of organosilicon-modified phenolic resin comprises the following steps: In parts by mass, 4 parts of ethyl orthosilicate, 9 parts of phenol, 7 parts of 35% formaldehyde aqueous solution, and 1 part of hydrochloric acid were reacted at 160°C for 5 hours, then cooled to 90°C, paraformaldehyde was added, stirred evenly, and the reaction was completed at 110°C, then the pH was adjusted to 7, and then dehydrated.

[0053] Secondly, this embodiment also provides a method for preparing the above-mentioned fiber-reinforced composite material, which specifically includes the following steps: The carbon fiber modified phenolic resin, silicone modified phenolic resin, reinforcing fiber, modified silicone polymer and 1 part of silane coupling agent were fully mixed, then cold pressed at 15 MPa and 50° C., and then sintered at 30 MPa and 200° C.

[0054] Performance testing The fiber reinforced composite materials obtained in the above examples and comparative examples were taken as samples, and performance tests were carried out with reference to GB 5763-2018 Brake Linings for Automobiles. Specific data are shown in Table 1. Table 1 Although the description of the present application has been quite detailed and specifically describes several embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the appended claims in view of the prior art, thereby effectively covering the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseeable by the applicant, which is intended to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A fiber-reinforced composite material, characterized in that: In parts by mass, the raw materials include: 31-39 parts of carbon fiber modified phenolic resin, 30-35 parts of organosilicon modified phenolic resin, 37-61 parts of reinforcing fiber, 19-31 parts of modified silicone polymer, and 20-45 parts of filler; The preparation method of the modified silicon polymer comprises the following steps: Under the protection of inert gas, maintaining -7°C to -13°C, methylphenyldichlorosilane and dimethyldiethoxysilane are mixed, and then ethylvinyldichlorosilane is slowly added dropwise and mixed, and then the temperature is raised to room temperature and fully stirred for 5h-10h, and then trimethylchlorosilane is added dropwise and fully reacted, and then water is added and the temperature is raised to 80°C-85°C until the reaction is complete, and then the pH is adjusted to neutral. After purification, the modified silicon polymer is obtained; the mass ratio of the methylphenyldichlorosilane, the dimethyldiethoxysilane and the ethylvinyldichlorosilane is (10-11): (6-8): (7-9).

2. A fiber-reinforced composite material according to claim 1, characterized in that: The preparation method of the carbon fiber modified phenolic resin comprises the following steps: Modifying the oxidized carbon fiber with a phthalate coupling agent to obtain a modified carbon fiber, and then mixing the modified carbon fiber with a first phenolic resin intermediate product and allowing them to react fully to obtain the carbon fiber-modified phenolic resin; The preparation method of the first phenolic resin intermediate product comprises the following steps: Mix phenol and 35%-40% formaldehyde aqueous solution in a mass ratio of (3-4): (1-1.5), add oxalic acid, and react at 90℃-110℃ for 2h-3h.

3. The fiber-reinforced composite material according to claim 2, characterized in that: The mass ratio of the modified carbon fiber to the first phenolic resin intermediate product is: (3-5): (11-13).

4. The fiber-reinforced composite material according to claim 1, characterized in that: The preparation method of the organosilicon-modified phenolic resin comprises the following steps: The organosilicon monomer, phenol, formaldehyde and catalyst are reacted at 150-170°C for 4-5 hours, then cooled to 85-95°C, paraformaldehyde is added, stirred evenly and allowed to react completely at 105-115°C, then the pH is adjusted to 6.5-7.5 and then dehydrated.

5. The fiber-reinforced composite material according to claim 4, characterized in that: The catalyst includes at least one of hydrochloric acid, sulfuric acid, oxalic acid, phosphoric acid, glacial acetic acid and boric acid.

6. The fiber-reinforced composite material according to claim 4, characterized in that: The organic silicon monomer includes at least one of ethyl orthosilicate and butyltrimethoxysilane.

7. The fiber-reinforced composite material according to claim 1, characterized in that: The filler includes at least one of barite, vermiculite, sepiolite, corundum, zircon, graphite, talc, wollastonite, zeolite, diatomaceous earth and brucite.

8. The method for preparing a fiber-reinforced composite material according to any one of claims 1 to 7, wherein: The following steps are involved: The carbon fiber modified phenolic resin, the organosilicon modified phenolic resin, the reinforcing fiber, the modified silicon polymer, the filler and the additive are fully mixed, followed by cold pressing and then sintering; The additive includes at least one of a curing agent, a lubricant and a silane coupling agent.

9. A brake pad, characterized in that The fiber-reinforced composite material comprises the fiber-reinforced composite material according to any one of claims 1 to 7.

10. Use of the brake pad according to claim 9 in new energy vehicles.

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