A cmc / uio66-nh2 synergistically modified carbon cloth reinforced resin friction material and method and application

Abstract

The application discloses a CMC / UiO66-NH2 synergistically modified carbon cloth reinforced resin friction material and a method and application thereof, and belongs to the technical field of friction materials. Different from a conventional nitric acid treated carbon fiber cloth, carboxymethyl cellulose with film forming properties is coated on the surface of the carbon fiber cloth, and dense and uniform octahedral UiO66-NH2 grains are in-situ grown on the surface of the pretreated carbon fiber cloth through a solvothermal method, the carbon fiber cloth loaded with the UiO66-NH2 is washed with N, N-dimethylformamide and anhydrous ethanol respectively, and then is subjected to freeze drying, impregnation treatment and hot-pressing curing to obtain the CMC / UiO66-NH2 synergistically modified carbon cloth reinforced resin friction material. The application adopts a two-component synergistically modified carbon fiber cloth and constructs a rigid-flexible interface reinforced structure with a resin matrix, improves the interface performance, and significantly improves the mechanical properties and friction and wear properties of the friction material, the tensile strength is 470.74-554.49 MPa, the friction coefficient is 0.111-0.128, and the wear rate is 2.33*10 ‑12 -6.10*10 ‑ 12 m 3 / (N*m).

Description

Technical Field

[0001] The present invention belongs to the technical field of wet friction materials, and in particular relates to a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material, a method and an application thereof. Background Art

[0002] With industrial development and the improvement of mechanical equipment performance, the requirements for friction materials are becoming increasingly stringent. Conventional friction materials are increasingly unable to meet the wear resistance, high-temperature resistance, and stability requirements of complex operating conditions, such as high-speed train braking systems and high-performance automotive brake components. In contrast, resin-based friction materials inherently offer excellent moldability and friction performance. Carbon cloth-reinforced resin-based friction materials are a high-performance material that has been developed in the friction material field. The addition of carbon cloth as a reinforcement primarily leverages its high strength, high modulus, and high-temperature resistance. Its inherent thermal stability effectively enhances the performance of friction materials in high-temperature environments, preventing rapid wear or failure during high-temperature friction. Furthermore, the addition of carbon cloth can enhance the material's toughness to a certain extent, enabling resin-based friction materials to withstand higher mechanical stresses and friction forces. However, the chemically inert nature of carbon fibers, due to their turbostratic graphite structure, prevents effective interfacial bonding between the fibers and the resin matrix. Therefore, surface modification of the carbon fibers and improving the interfacial bonding between the fibers and the resin matrix are key to improving the mechanical properties and friction and wear resistance of carbon cloth-reinforced resin-based friction materials.

[0003] The Chinese patent "A 2.5-dimensional carbon fiber woven preform reinforced resin-based friction material" with publication number CN105216343B improves the strength, elongation and smoothness of carbon fibers by sizing and twisting the surface of the carbon fibers. During the weaving process of the 2.5-dimensional structure, it effectively reduces the generation of carbon fiber hairiness and damage, while increasing the surface activity of the fibers and enhancing the interfacial bonding with the matrix material. The resulting carbon fiber reinforced resin-based friction material forms a three-dimensional structure, overcomes the delamination problem, increases the interlaminar shear strength, has outstanding mechanical properties, extends service life, and has excellent structural integrity and designability. However, the preparation process of the 2.5-dimensional woven preform is relatively complex, and during long-term use, the interfacial bonding between the carbon fibers and the resin matrix is ​​relatively weak, and the mechanical properties and friction and wear properties are relatively low. Chinese patent publication number CN114196164A, "A Carbon Fiber Composite Material Electrostatically Self-Assembled After Plasma Treatment and Its Preparation Method," utilizes a plasma generator to directionally coat nitrogen atoms onto the surface of carbon fibers in the form of nitrogen-containing groups. The carbon fibers are then ionized and hydrolyzed in a solvent to impart heterogeneous charges to the carbon fibers. This electrostatic attraction allows for electrostatic self-assembly to reinforce the carbon fibers, which are then combined with epoxy resin to produce a reinforced composite material with excellent interfacial properties. However, improper control of plasma treatment parameters (such as power and treatment time) can lead to excessive etching of the carbon fiber surface, resulting in compromised carbon fiber strength and relatively high treatment costs, making it unsuitable for industrial production.

[0004] In view of the problem of poor interface bonding between carbon fiber and resin matrix, it is urgent to find a new carbon fiber surface modification method to improve the interface bonding between carbon fiber and resin matrix and improve the mechanical properties and friction and wear properties of carbon cloth reinforced resin-based friction materials. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material and method and application, so as to solve the technical problem that the interface bonding between carbon fiber and resin matrix is ​​poor, resulting in low mechanical properties and friction and wear performance of the friction material.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses a preparation method of a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material, comprising the following steps:

[0008] Diaminoterephthalic acid is dissolved in N,N-dimethylformamide, zirconium chloride is added and ultrasonically treated, and then acetic acid is added dropwise. After stirring and reacting, a mixed solution is obtained. The pretreated carbon fiber cloth is rolled up and vertically placed in the mixed solution for solvent thermal reaction. After the reaction, N,N-dimethylformamide and anhydrous ethanol are used for alternating washing. After freeze-drying, the carbon fiber cloth is vacuum impregnated in a phenolic resin ethanol solution, dried, and hot-pressed to obtain a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material.

[0009] Preferably, the usage ratio of diaminoterephthalic acid, N,N-dimethylformamide, zirconium chloride, acetic acid and carbon fiber cloth is (0.108-0.216) g: (50-100) ml: (0.14-0.28) g: (4-20) ml: (6-10) g.

[0010] Preferably, the rotation speed of the stirring reaction is 800-1500 r / min.

[0011] Preferably, the temperature of the solvent thermal reaction is 110-130° C., and the time is 18-36 hours.

[0012] Preferably, the mass fraction of the phenolic resin ethanol solution is 23%-27%; the vacuum impregnation conditions include: impregnation at room temperature, a pressure of 0.07-0.1 MPa, and 24-26 hours.

[0013] Preferably, the temperature of hot pressing curing is 170-190° C., the pressure is 4-6 MPa, and the curing time is 9-13 min.

[0014] Preferably, the pretreatment of the carbon fiber cloth includes: first soaking the carbon fiber cloth in acetone once, washing with deionized water, drying once, then soaking it in a carboxymethyl cellulose solution a second time, washing with deionized water, and drying it a second time.

[0015] Further preferably, the conditions for the first soaking are: soaking at room temperature for 27-56 hours; the carboxymethyl cellulose solution is prepared by adding 0.3-0.6g of carboxymethyl cellulose to every 300g of deionized water; and the conditions for the second soaking are: soaking at 75-95°C for 2-4 hours.

[0016] The present invention also discloses a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, which is prepared by the above-mentioned CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material preparation method, and has a tensile strength of 470.74-554.49 MPa; a friction coefficient of 0.111-0.128; and a wear rate of 2.33×10 -12 -6.10×10 -12 m 3 / (N·m).

[0017] The present invention also discloses the application of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared by the preparation method of the above-mentioned CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material in high-speed train braking.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention discloses a method for preparing a CMC / UiO66-NH2 synergistically non-destructively modified carbon cloth reinforced with a resin friction material. The method utilizes CMC and UiO66-NH2 to synergistically modify carbon fiber cloth and construct a rigid-flexible interface reinforcement structure with a resin matrix. A film-like CMC coating is applied to the carbon fiber surface, introducing oxygen-containing functional groups that provide numerous nucleation sites for subsequent crystal growth without compromising the bulk strength of the carbon fiber. Subsequently, dense and uniform octahedral UiO66-NH2 is grown in situ, forming nanoscale micro-protrusions that facilitate mechanical engagement between the carbon fiber and the resin matrix. The introduction of active functional groups, such as amino groups, allows chemical bonding between the carbon fiber and the resin matrix during hot pressing, improving interfacial properties and significantly enhancing the mechanical and friction and wear properties of the friction material. Previous methods of grafting fibers using nitric acid treatment can modify the fiber surface but often cause significant damage to the bulk strength of the fiber. This damage can reduce the overall mechanical properties of the final friction material. In this invention, carbon fiber is pretreated with CMC (carboxymethyl cellulose) to form a film-like coating. This treatment method is "non-destructive", which means that it achieves surface modification without sacrificing the original strength of the carbon fiber. As a flexible layer, CMC not only protects the integrity of the carbon fiber, but also provides nucleation sites for the subsequent growth of UiO66-NH2 crystals by introducing oxygen-containing functional groups. As a flexible interface, the CMC layer can effectively relieve the stress concentration between the carbon fiber and the resin matrix and improve the toughness of the material. At the same time, the functional groups it contains provide the basis for subsequent chemical reactions. On the basis of the CMC layer, a dense and uniform octahedral UiO66-NH2 structure was formed through in situ growth technology. This rigid layer not only enhances the roughness of the carbon fiber surface, forms nano-scale micro-convex bodies, and increases the mechanical meshing with the resin matrix, but also the active functional groups such as amino groups in UiO66-NH2 can chemically bond with the resin matrix, further strengthening the interface bonding. By synergistically modifying the carbon fiber surface with CMC and UiO66-NH2, and constructing a rigid-flexible interface reinforcement structure with the resin matrix, the material exhibits both mechanical meshing (via nanoscale micro-protrusions) and chemical bonding (through chemical bonding between amino and other functional groups and the resin matrix). This dual mechanism greatly improves the interfacial bonding between the carbon fiber and the resin matrix. Due to the improved interfacial bonding, the friction material is able to better transfer stress when subjected to external forces, avoiding crack propagation and debonding at the interface, thereby significantly improving the material's mechanical properties (such as tensile strength and flexural strength) and friction and wear properties (such as wear resistance and anti-slip properties).The present invention has a simple preparation process, low cost, and excellent performance. The mechanical properties and friction and wear properties of the friction material are improved through the synergistic effect of mechanical meshing and chemical bonding. The modified CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material has a tensile strength of 470.74-554.49 MPa, a friction coefficient of 0.111-0.128, and a wear rate of 2.33×10. -12 -6.10×10 -12 m 3 / (N·m); compared with the unmodified carbon cloth reinforced resin-based friction material, the tensile strength is increased by 48.63%-75.10%, the friction coefficient is increased by 16.8%-34.7%, and the wear rate is reduced by 50.5%-81.1%.

[0020] Furthermore, the ratio of diaminoterephthalic acid, N,N-dimethylformamide, zirconium chloride, acetic acid, and carbon fiber cloth is (0.108-0.216) g: (50-100) ml: (0.14-0.28) g: (4-20) ml: (6-10) g. Precise control of the raw material ratios is key to ensuring a smooth reaction and stable product quality. This optimized ratio allows for sufficient reaction between the raw materials, forming a stable structure while minimizing raw material waste and the formation of byproducts, thereby improving raw material utilization and the product's cost-effectiveness.

[0021] Furthermore, the stirring reaction speed is 800-1500 r / min. An appropriate stirring speed can ensure sufficient mixing and contact between the reactants, improving reaction efficiency. At the same time, it avoids local overheating or uneven reaction caused by too high a speed, and incomplete reaction caused by too low a speed, thereby ensuring product uniformity and consistency.

[0022] Furthermore, the solvothermal reaction temperature is 110-130°C, and the reaction time is 18-36 hours. This temperature and time range ensures a deep reaction between the reactants, forming stable chemical bonds and structures. It also avoids excessively high temperatures that could lead to an overly rapid reaction or increased side reactions, as well as insufficient reaction time that could lead to incomplete reactions, thereby improving the product's stability and performance.

[0023] Furthermore, the mass fraction of the phenolic resin ethanol solution is 23%-27%. The vacuum impregnation conditions include: impregnation at a pressure of 0.07-0.1 MPa at room temperature. The appropriate mass fraction of the phenolic resin ethanol solution ensures that the carbon cloth fully absorbs the resin, forming a dense composite structure. The vacuum impregnation conditions further enhance the impregnation effect, allowing the resin to evenly penetrate every fiber of the carbon cloth, strengthening the bonding between the carbon cloth and the resin and improving the overall performance of the product.

[0024] Furthermore, the hot press curing temperature is 170-190°C, the pressure is 4-6 MPa, and the curing time is 9-13 minutes. These hot press curing conditions ensure that the resin is fully cured, forming a hard and dense composite structure. At the same time, the appropriate temperature and pressure also promote further bonding between the carbon cloth and the resin, improving the product's mechanical properties and heat resistance.

[0025] Furthermore, the carbon fiber cloth is pretreated by soaking it in acetone, washing it with deionized water, and drying it once. It is then soaked in a carboxymethyl cellulose solution for a second time, washed with deionized water, and dried again. This pretreatment step thoroughly cleans the surface of the carbon cloth, removing impurities and oil stains, and improving the adhesion between the carbon cloth and the resin. The soaking in carboxymethyl cellulose also acts as a reinforcing agent, further improving the performance of the carbon cloth and its bonding with the resin.

[0026] Furthermore, the soaking time is 27-56 hours at room temperature. Long soaking ensures that the carbon cloth fully absorbs the acetone, effectively removing impurities and oil stains on the surface, and providing a good foundation for subsequent treatment. It also avoids incomplete cleaning due to too short a soaking time, or damage to the carbon cloth due to too long a soaking time.

[0027] Furthermore, the carboxymethyl cellulose solution is prepared by adding 0.3-0.6g of carboxymethyl cellulose to every 300g of deionized water; the secondary immersion conditions are: immersion at 75-95°C for 2-4 hours. The appropriate carboxymethyl cellulose concentration ensures that it forms a uniform coating on the carbon cloth surface, improving the adhesion between the carbon cloth and the resin and the overall strength of the material. The high temperature conditions of the secondary immersion further promote the adhesion and penetration of the carboxymethyl cellulose on the carbon cloth surface, enhancing the performance of the carbon cloth and its bonding with the resin. At the same time, it avoids uneven coating or poor effect caused by too high or too low concentration, and performance damage or waste caused by too long or too short immersion time.

[0028] The present invention also discloses a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, which is prepared by the above-mentioned CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material preparation method. The tensile strength is 470.74-554.49 MPa, which is 48.63%-75.10% higher than that of the unmodified material; the friction coefficient is 0.111-0.128, which is 16.8%-34.7% higher than that of the unmodified material; the wear rate is 2.33×10 -12 -6.10×10 - 12 m 3 / (N·m), and the wear rate is reduced by 50.5%-81.1% compared to unmodified materials. Compared with unmodified carbon cloth-reinforced resin-based friction materials, all performance indicators have been significantly improved, showing significant advantages in applications requiring high strength and high wear resistance, such as high-speed train braking.

[0029] The present invention also discloses the application of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared by the preparation method of the above-mentioned CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material in high-speed train braking. The CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared by the present invention not only has excellent mechanical properties and friction and wear properties, but also has good heat resistance and chemical stability. This makes the material have broad application prospects and huge application value in the fields of high-speed train braking, automobile braking systems, aerospace, etc. In particular, in high-speed train braking systems, the high strength, high wear resistance and good thermal stability of the material can significantly improve braking performance and safety, providing strong support for the development of high-speed railways. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 SEM photos of the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in the present invention, wherein (a) is the original carbon cloth, (b) is the carbon cloth after CMC pretreatment, (c) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 1, (d) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 2, and (e) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 3;

[0031] Figure 2 This is a comparison chart of the tensile strength of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared in the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3;

[0032] Figure 3This is a comparison chart of the friction coefficients of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction materials prepared in the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3;

[0033] Figure 4 This is a comparison chart of the wear rates of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction materials prepared in the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] In the present invention, unless otherwise specified, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0036] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0037] In the present invention, unless otherwise specified, percentages (%) or parts refer to percentages by weight or parts by weight relative to the composition.

[0038] In the present invention, unless otherwise specified, the components or preferred components involved can be combined with each other to form a new technical solution.

[0039] In this disclosure, unless otherwise specified, the numerical range "a-b" is an abbreviation for any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "6-22" indicates that all real numbers between "6-22" are listed herein, and "6-22" is merely an abbreviation for these numerical combinations.

[0040] The "range" disclosed in the present invention is in the form of lower limit and upper limit, which can be one or more lower limits, and one or more upper limits respectively.

[0041] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the order. Preferably, the reaction method herein is carried out sequentially.

[0043] Unless otherwise indicated, the professional and scientific terms used herein are the same as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content can also be applied to the present invention.

[0044] The present invention provides a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, the steps of which are as follows:

[0045] Step 1: Soak the carbon fiber cloth in acetone at room temperature for pretreatment to remove the surface sizing agent and impurities, wash it with deionized water and dry it for later use.

[0046] Step 2: Soak the carbon fiber cloth obtained in step 1 in a carboxymethyl cellulose solution, wash it two to three times with deionized water, and then dry it for later use.

[0047] Step 3: First, dissolve diaminoterephthalic acid in N, N-dimethylformamide to obtain a mixed solution A. Next, zirconium chloride is added to the mixed solution A and ultrasonically treated to obtain a mixed solution B. Then, acetic acid is added dropwise to form a mixed solution C. Subsequently, the carbon fiber cloth obtained in step 2 is rolled up and placed vertically in a polytetrafluoroethylene reactor containing mixed solution C for solvent thermal reaction. After the reaction is completed, it is repeatedly filtered and washed with N, N-dimethylformamide and anhydrous ethanol, and finally freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth.

[0048] Step 4: The CMC / UiO66-NH2 synergistically modified carbon fiber cloth obtained in step 3 is vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 25%, and after drying, hot-pressed and cured in a vulcanizer to obtain a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material.

[0049] Furthermore, the method for pre-treating the removal of surface sizing agents and impurities in step 1 is: soaking the carbon fiber cloth in an acetone solution at room temperature for 27-56 hours.

[0050] Furthermore, in step 2, 0.3-0.6 g of carboxymethyl cellulose is added to every 300 g of deionized water; and the soaking conditions are: soaking at 75-95° C. for 2-4 hours.

[0051] Furthermore, in step three, 6-10 g of carbon fiber cloth, 0.108-0.216 g of diaminoterephthalic acid and 0.14-0.28 g of zirconium chloride are added to every 50-100 ml of N,N-dimethylformamide.

[0052] Furthermore, in step 3, the magnetic stirring of the mixed liquid C is controlled to have a rotation speed of 800-1500 r / min, and 4-20 ml of acetic acid is added dropwise to the mixed liquid using a syringe.

[0053] Furthermore, in step 3, the temperature of the solvothermal reaction is 110-130° C., and the time is 18-36 h.

[0054] Furthermore, the mass fraction of the resin in step 4 is 23%-27%; and the vacuum impregnation conditions include: impregnation at room temperature, at a pressure of 0.07-0.1 MPa, for 24-26 hours.

[0055] Furthermore, the process parameters of hot pressing curing in step 4 of the vulcanizing machine are: temperature 170-190° C., pressure 4-6 MPa, and curing time 9-13 min.

[0056] The present invention discloses a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material. The CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material has a tensile strength of 470.74-554.49 MPa; a friction coefficient of 0.111-0.128; and a wear rate of 2.33×10 -12 -6.10×10 -12 m 3 / (N·m).

[0057] The present invention uses CMC / UiO66-NH2 two-component synergistic non-destructive modification of carbon fiber cloth and constructs a rigid-flexible interface reinforcement structure with a resin matrix, which significantly improves the mechanical properties and friction and wear properties of the friction material. At the same time, it optimizes the preparation process, reduces costs, broadens the application field, and complies with the concept of green development, providing a high-performance, environmentally friendly friction material solution for fields such as high-speed train braking.

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] Example 1

[0060] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0061] Step 1: Place 10g of carbon fiber cloth in acetone, seal it and soak it at room temperature for 48 hours, then wash the carbon fiber cloth with deionized water and dry it;

[0062] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, washing it twice with deionized water, and drying it for later use;

[0063] Step 3: Dissolve 0.216 g of diaminoterephthalic acid in 100 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0064] Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0065] Step 5: 4 mL of acetic acid was added dropwise to the mixed solution B with magnetic stirring at a speed of 1000 r / min, and mixed to obtain a mixed solution C;

[0066] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0067] Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react at 120° C. and a rotation speed of 55 r / min for 24 hours to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0068] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0069] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 25% by mass phenolic resin ethanol solution under the following conditions: pressure of 0.08 MPa at room temperature and immersion time of 24 h.

[0070] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6 MPa, and curing time 10 minutes. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 470.74 MPa, a friction coefficient of 0.111, and a wear rate of 6.1×10 -12 m 3 / (N·m); the tensile strength increased by 48.6%, the friction coefficient increased by 16.8%, and the wear rate decreased by 50.5%.

[0071] Example 2

[0072] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0073] Step 1: Place 10g of carbon fiber cloth in acetone, seal it, and soak it at room temperature for 48 hours. Then, wash the carbon fiber cloth with deionized water two to three times and dry it.

[0074] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, washing it three times with deionized water, and drying it for later use;

[0075] Step 3: Dissolve 0.216 g of diaminoterephthalic acid in 100 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0076] Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0077] Step 5: Add 12 mL of acetic acid dropwise to the mixed solution B, stir magnetically at a speed of 1000 r / min, and mix well to obtain a mixed solution C;

[0078] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0079] Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react at 120° C. and a rotation speed of 55 r / min for 24 hours to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0080] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0081] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 25% by mass phenolic resin ethanol solution under the following conditions: pressure of 0.08 MPa at room temperature and immersion time of 24 h.

[0082] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6 MPa, and curing time 10 min. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 554.49 MPa, a friction coefficient of 0.128, and a wear rate of 2.33×10 -12 m 3 / (N·m); tensile strength increased by 75.1%, friction coefficient increased by 34.7%, and wear rate decreased by 81.1%.

[0083] Example 3

[0084] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0085] Step 1: Place 10g of carbon fiber cloth in acetone, seal it, and soak it at room temperature for 48 hours. Then, wash the carbon fiber cloth with deionized water two to three times and dry it.

[0086] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, washing it three times with deionized water, and drying it for later use;

[0087] Step 3: Dissolve 0.216 g of diaminoterephthalic acid in 100 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0088] Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0089] Step 5: Add 20 mL of acetic acid dropwise to the mixed solution B, stir magnetically at a speed of 1000 r / min, and mix well to obtain a mixed solution C;

[0090] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0091] Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react at 120° C. and a rotation speed of 55 r / min for 24 hours to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0092] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0093] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 25% by mass phenolic resin ethanol solution under the following conditions: pressure of 0.08 MPa at room temperature and immersion time of 24 h.

[0094] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6 MPa, and curing time 10 min. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 516.56 MPa, a friction coefficient of 0.123, and a wear rate of 4.87×10-12 m 3 / (N·m); the tensile strength increased by 63.1%, the friction coefficient increased by 29.4%, and the wear rate decreased by 60.5%.

[0095] Example 4

[0096] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0097] Step 1: Place 6g of carbon fiber cloth in acetone, seal it, and soak it at room temperature for 27 hours. Then, wash the carbon fiber cloth three times with deionized water and dry it.

[0098] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.3% carboxymethyl cellulose solution at 75° C. for 2 hours, washing it two to three times with deionized water, and drying it for later use;

[0099] Step 3: Dissolve 0.108 g of diaminoterephthalic acid in 50 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0100] Step 4: adding 0.14 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0101] Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir magnetically at a speed of 800 r / min, and mix well to obtain a mixed solution C;

[0102] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0103] Step 7: The stainless steel reactor containing the mixed solution C and the carbon fiber cloth was fixed in a homogeneous reactor and reacted at 110° C. and a rotation speed of 55 r / min for 18 h to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0104] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0105] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 23% mass fraction phenolic resin ethanol solution under the following conditions: pressure of 0.07 MPa at room temperature and immersion time of 24 h.

[0106] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 180°C, pressure 4 MPa, and curing time 9 minutes. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 480.54 MPa, a friction coefficient of 0.115, and a wear rate of 5.9×10 -12 m 3 / (N·m); the tensile strength increased by 51.7%, the friction coefficient increased by 21.1%, and the wear rate decreased by 52.1%.

[0107] Example 5

[0108] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0109] Step 1: Place 8g of carbon fiber cloth in acetone, seal it, and soak it at room temperature for 56 hours. Then, wash the carbon fiber cloth twice with deionized water and dry it.

[0110] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.6% carboxymethyl cellulose solution at 95° C. for 4 hours, washing it two to three times with deionized water, and drying it for later use;

[0111] Step 3: Dissolve 0.153 g of diaminoterephthalic acid in 80 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0112] Step 4: adding 0.198 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0113] Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir magnetically at a speed of 1500 r / min, and mix well to obtain a mixed solution C;

[0114] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0115] Step 7: The stainless steel reactor containing the mixed solution C and the carbon fiber cloth was fixed in a homogeneous reactor and reacted at 130° C. and a rotation speed of 55 r / min for 32 hours to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0116] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0117] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 27% mass fraction phenolic resin ethanol solution. The impregnation conditions were: pressure 0.1 MPa at room temperature and impregnation time 26 h.

[0118] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 190°C, pressure 5 MPa, and curing time 12 minutes. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 490.84 MPa, a friction coefficient of 0.118, and a wear rate of 6.3×10 -12 m 3 / (N·m); tensile strength increased by 55%, friction coefficient increased by 24.2%, and wear rate decreased by 48.9%.

[0119] Example 6

[0120] A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps:

[0121] Step 1: Place 8g of carbon fiber cloth in acetone, seal it, and soak it at room temperature for 56 hours. Then, wash the carbon fiber cloth three times with deionized water and dry it.

[0122] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.6% carboxymethyl cellulose solution at 95° C. for 4 hours, washing it two to three times with deionized water, and drying it for later use;

[0123] Step 3: Dissolve 0.185 g of diaminoterephthalic acid in 80 mL of N,N-dimethylformamide at room temperature to obtain a mixed solution A, and perform ultrasonic treatment on the mixed solution A to uniformly disperse the diaminoterephthalic acid in the mixed solution A;

[0124] Step 4: adding 0.239 g of zirconium chloride to the mixed solution A and performing ultrasonic treatment to obtain a mixed solution B;

[0125] Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir magnetically at a speed of 1500 r / min, and mix well to obtain a mixed solution C;

[0126] Step 6: Pour the mixed solution C and carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor;

[0127] Step 7: The stainless steel reactor containing the mixed solution C and the carbon fiber cloth was fixed in a homogeneous reactor and reacted at 130° C. and a rotation speed of 55 r / min for 36 hours to obtain a grafted UiO66-NH2 carbon fiber cloth;

[0128] The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 was washed with N,N-dimethylformamide and anhydrous ethanol several times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and then freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth;

[0129] The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a 25% by mass phenolic resin ethanol solution. The impregnation conditions were: pressure of 0.1 MPa at room temperature and impregnation time of 26 h.

[0130] The impregnated preform was placed in an oven and allowed to dry before being hot-pressed and cured in a vulcanizer to produce a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 190°C, pressure 6 MPa, and curing time 13 minutes. The resulting CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material had a tensile strength of 476.41 MPa, a friction coefficient of 0.121, and a wear rate of 5.1×10 -12 m 3 / (N·m); tensile strength increased by 50.4%, friction coefficient increased by 27.4%, and wear rate decreased by 58.6%.

[0131] Comparative Example 1

[0132] A method for preparing an unmodified carbon cloth reinforced resin-based friction material comprises the following steps:

[0133] Step 1: Soak 10g of carbon fiber cloth in acetone at room temperature for 48 hours to remove surface sizing and impurities, wash it three times with deionized water, and then dry it for later use;

[0134] Step 2: Vacuum impregnate the carbon fiber cloth obtained in step 1 into a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions are: pressure of 0.08 MPa at room temperature and impregnation time of 24 h;

[0135] Step 3: The impregnated preform was placed in an oven and allowed to dry. It was then hot-pressed and cured in a vulcanizer to obtain an unmodified carbon cloth reinforced resin-based friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6 MPa, and curing time 10 minutes. The obtained unmodified carbon cloth reinforced resin-based friction material had a tensile strength of 316.73 MPa, a friction coefficient of 0.095, and a wear rate of 12.33×10 -12 m 3 / (N·m).

[0136] Comparative Example 2

[0137] A method for preparing a CMC pretreated carbon cloth reinforced resin-based friction material comprises the following steps:

[0138] Step 1: Soak 10g of carbon fiber cloth in acetone at room temperature for 48 hours to remove surface sizing and impurities, wash it three times with deionized water, and then dry it for later use;

[0139] Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.15% by mass carboxymethyl cellulose solution at 80° C. for 3 hours, washing it with deionized water two to three times, and then drying it to obtain a CMC pretreated carbon cloth;

[0140] Step 3: Vacuum impregnate the carbon fiber cloth obtained in step 2 into a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions are: pressure of 0.08 MPa at room temperature and impregnation time of 24 h.

[0141] Step 4: The impregnated preform was placed in an oven and allowed to dry. It was then hot-pressed and cured in a vulcanizer to obtain a CMC-pretreated carbon cloth reinforced resin-based friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6 MPa, and curing time 10 minutes. The obtained CMC-pretreated carbon cloth reinforced resin-based friction material had a tensile strength of 383.37 MPa, a friction coefficient of 0.103, and a wear rate of 8.5×10 -12 m 3 / (N·m).

[0142] See also Figure 1These are SEM photos of the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in the present invention, wherein (a) is the original carbon cloth, (b) is the carbon cloth after CMC pretreatment, (c) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 1, (d) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 2, and (e) is the CMC / UiO66-NH2 synergistically modified carbon cloth prepared in Example 3; it can be seen from the figure that the surface of the original carbon fiber is smooth with narrow and shallow grooves, the surface of the carbon cloth after CMC pretreatment is covered with a layer of film, and the surface of the carbon fiber after grafting UiO66-NH2 carbon fiber cloth is covered with uniform and dense octahedral small particles.

[0143] Figure 2 This is a tensile strength comparison chart of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared by the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3; it can be seen from the figure that after grafting UiO66-NH2, due to the increase in surface polarity, the wettability between carbon fiber and resin is improved, and the tensile strength of the composite materials is improved, with the tensile strength increased by 48.63%-75.10%.

[0144] Figure 3 This is a comparison chart of the friction coefficients of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction materials prepared in the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3; it can be seen from the figure that the friction coefficient is improved, and the friction coefficient is increased by 16.8%-34.7%.

[0145] Figure 4This is a comparison chart of the wear rates of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction materials prepared in the present invention, wherein C1 is an unmodified carbon cloth reinforced resin-based friction material, C2 is a carbon cloth reinforced resin-based friction material after CMC pretreatment, C3 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material prepared in Example 3; it can be seen from the figure that the wear rate of the friction material decreases after grafting, and the wear rate is reduced by 50.5%-81.1%.

[0146] In summary, the present invention presents a method for preparing a CMC / UiO66-NH2 synergistically non-destructively modified carbon cloth-reinforced resin friction material. This method combines the unique properties of carboxymethyl cellulose (CMC) and a high-performance metal-organic framework (UiO66-NH2) to achieve efficient and non-destructive modification of the carbon cloth surface. The interfacial bonding between the carbon cloth and the resin matrix is ​​successfully enhanced, resulting in significant improvements in the mechanical properties, friction coefficient, and wear resistance of the resulting friction material. This friction material not only exhibits excellent tensile strength and the ability to withstand extreme mechanical stress, but also exhibits a stable friction coefficient and low wear rate, maintaining excellent performance even under extreme operating conditions. These excellent properties make this material promising for broad application in high-speed train braking systems, high-performance automotive brake components, and other fields. The present invention's preparation method is simple, easy to operate, and cost-effective, making it feasible for large-scale industrial production.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material, characterized in that: The following steps are involved: Diaminoterephthalic acid is dissolved in N,N-dimethylformamide, zirconium chloride is added and ultrasonically treated, and then acetic acid is added dropwise. After stirring and reacting, a mixed solution is obtained. The pretreated carbon fiber cloth is rolled up and vertically placed in the mixed solution for a solvothermal reaction. After the reaction, N,N-dimethylformamide and anhydrous ethanol are used for alternating washing. After freeze-drying, the carbon fiber cloth is vacuum-impregnated in a phenolic resin ethanol solution, dried, and hot-pressed to obtain a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material. The pretreatment of the carbon fiber cloth includes: soaking the carbon fiber cloth in acetone once, washing with deionized water, drying once, soaking it in a carboxymethyl cellulose solution twice, washing with deionized water, and drying it twice.

2. The method for preparing the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The usage ratio of the diaminoterephthalic acid, N,N-dimethylformamide, zirconium chloride, acetic acid and carbon fiber cloth is (0.108-0.216) g: (50-100) ml: (0.14-0.28) g: (4-20) ml: (6-10) g.

3. The method for preparing the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The rotation speed of the stirring reaction is 800-1500 r / min.

4. The method for preparing the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The temperature of the solvent thermal reaction is 110-130° C., and the time is 18-36 hours.

5. The method for preparing the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The mass fraction of the phenolic resin ethanol solution is 23%-27%; the vacuum impregnation conditions include: impregnation at room temperature, at a pressure of 0.07-0.1 MPa, and for 24-26 hours.

6. The method for preparing the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The temperature of the hot pressing curing is 170-190° C., the pressure is 4-6 MPa, and the curing time is 9-13 minutes.

7. The method for preparing the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material according to claim 1, characterized in that: The conditions for the first soaking are: soaking at room temperature for 27-56 hours; the carboxymethyl cellulose solution is prepared by adding 0.3-0.6g of carboxymethyl cellulose to every 300g of deionized water; the conditions for the second soaking are: soaking at 75-95°C for 2-4 hours.

8. A CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material, characterized in that: The friction material is prepared by the preparation method of CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to any one of claims 1 to 7, with a tensile strength of 470.74-554.49 MPa; a friction coefficient of 0.111-0.128; and a wear rate of 2.33×10 -12 -6.10×10 -12 m 3 / (N·m).

9. Application of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared by the preparation method of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to any one of claims 1 to 7 in high-speed train braking.

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