CMC / UiO66-NH2 synergistically losslessly modified carbon cloth reinforced resin friction material as well as method and application thereof

Abstract

The invention discloses a CMC / UiO66-NH2 synergistically losslessly modified carbon cloth reinforced resin friction material as well as a method and application thereof, and belongs to the technical field of friction materials. Different from conventional nitric acid treated carbon fiber cloth, carboxymethyl cellulose with a film-forming characteristic is coated on the surface of the carbon fiber cloth, compact and uniform octahedral UiO66-NH2 crystal grains are grown in situ on the surface of the pretreated carbon fiber cloth through a solvothermal method, the UiO66-NH2-loaded carbon fiber cloth is washed with N, N-dimethylformamide and absolute ethyl alcohol respectively, and then the carbon fiber cloth is dried to obtain the UiO66-NH2-loaded carbon fiber cloth. And carrying out freeze drying, carrying out dipping treatment, and then carrying out hot-pressing curing to obtain the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material. According to the invention, the carbon fiber cloth is synergistically modified by two components, and the two components and a resin matrix construct a rigid-flexible interface enhanced structure, so that the interface performance is improved, the mechanical properties and frictional wear properties of the friction material are remarkably improved, and the tensile strength is 470.74-554.49 MPa; the friction coefficient ranges from 0.111 to 0.128; and the wear rate is 2.33 * 10 <-12 >-6.10 * 10 <-12 > m < 3 > / (N.m).

Description

Technical Field

[0001] The invention belongs to the technical field of wet friction materials, and specifically 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 the development of industry and the improvement of mechanical equipment performance, the requirements for friction materials are becoming increasingly stringent. Traditional friction materials are gradually unable to meet the requirements of complex working conditions such as high-speed train braking systems and high-performance automotive brake components in terms of wear resistance, high temperature resistance and stability. In contrast, resin-based friction materials themselves have good molding properties and friction properties. Carbon cloth reinforced resin-based friction materials are a high-performance material developed in the field of friction materials. The addition of carbon cloth as a reinforcing material is mainly based on the high strength, high modulus and high temperature resistance of carbon cloth. Carbon cloth itself has good thermal stability, which can effectively improve the performance of friction materials in high temperature environments and prevent the material from being worn or failing too quickly during high temperature friction. At the same time, the addition of carbon cloth can also improve the toughness of the material to a certain extent, so that the resin-based friction material can withstand higher mechanical stress and friction. However, due to the chaotic graphite structure of carbon fiber and its chemical inertness, an effective interface bonding cannot be formed between the fiber and the resin matrix. Therefore, surface modification of carbon fiber and improvement of the interface bonding between carbon fiber and resin matrix are the key to improving the mechanical properties and friction and wear properties 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 fiber by sizing and twisting the surface of carbon fiber. In the weaving process of the 2.5-dimensional structure, it effectively reduces the generation of carbon fiber hairiness and damage, while improving the surface activity of the fiber 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 complicated, and during long-term use, the interfacial bonding between the carbon fiber and the resin matrix is ​​relatively weak, and the mechanical properties and friction and wear properties are relatively low. The Chinese patent with publication number CN114196164A, "A carbon fiber composite material electrostatically self-assembled after plasma treatment and its preparation method", uses a plasma generator to directionally coat nitrogen atoms on the surface of carbon fiber in the form of nitrogen-containing groups, and then undergoes ionization and hydrolysis with graphene oxide in a solvent to carry heterogeneous charges, and electrostatically self-assembles under the action of electrostatic attraction to reinforce the carbon fiber, and combines with epoxy resin to obtain a reinforced composite material with good interface performance. However, improper control of plasma treatment parameters (such as power, treatment time, etc.) may over-etch the carbon fiber surface, resulting in damage to the strength of the carbon fiber itself and relatively high treatment costs, which is not conducive to 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 synergistic 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 properties of the friction material.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses a preparation method of a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, comprising the following steps: Diaminoterephthalic acid is dissolved in N, N-dimethylformamide, zirconium chloride is added and ultrasonic treatment is performed, and acetic acid is added dropwise. After stirring for reaction, 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 is completed, N, N-dimethylformamide and anhydrous ethanol are used for alternate washing. After freeze-drying, it is vacuum impregnated in a phenolic resin ethanol solution. After drying, it is hot-pressed and cured to obtain CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material.

[0007] 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.

[0008] Preferably, the rotation speed of the stirring reaction is 800-1500 r / min.

[0009] Preferably, the temperature of the solvothermal reaction is 110-130° C. and the time is 18-36 h.

[0010] Preferably, the mass fraction of the phenolic resin ethanol solution is 23%-27%; the vacuum impregnation conditions include: impregnation for 24-26 hours at room temperature and a pressure of 0.07-0.1 MPa.

[0011] 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.

[0012] Preferably, the pretreatment of the carbon fiber cloth includes: firstly immersing the carbon fiber cloth in acetone once, washing with deionized water, drying once, then immersing it in a carboxymethyl cellulose solution for a second time, washing with deionized water, and drying it for a second time.

[0013] 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.

[0014] 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 470.74-554.49MPa; 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).

[0015] The present invention also discloses the application of the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material prepared by the preparation method of the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material in high-speed train braking.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a preparation method of CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, wherein CMC and UiO66-NH2 are used to synergistically modify carbon fiber cloth and construct a rigid-flexible interface reinforcement structure with a resin matrix, a film-like CMC is coated on the surface of the carbon fiber, oxygen-containing functional groups are introduced, a large number of nucleation sites are provided for the subsequent crystal growth, and the bulk strength of the carbon fiber is not damaged, and dense and uniform octahedral UiO66-NH2 is subsequently grown in situ to form nano-scale micro-convex bodies, which is beneficial to the mechanical engagement between the carbon fiber and the resin matrix; active functional groups such as amino groups are introduced, and the carbon fiber and the resin matrix form chemical bonds during the hot pressing process, which improves the interface performance, thereby significantly improving the mechanical properties and friction and wear properties of the friction material. In the past, the method of grafting by treating the fiber with nitric acid can achieve the modification of the fiber surface, but often causes considerable damage to the bulk strength of the fiber. Such damage will reduce the overall mechanical properties of the final friction material. The invention pre-treats the carbon fiber 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 alleviate 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 nanoscale 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, it has both mechanical meshing (through nano-scale micro-convex bodies) and chemical bonding (through chemical bonding of amino and other functional groups with the resin matrix). This dual action mechanism greatly improves the interfacial bonding between the carbon fiber and the resin matrix. Due to the improvement of the interfacial bonding, the friction material can better transfer stress when subjected to external forces, avoiding crack propagation and debonding at the interface, thereby significantly improving the mechanical properties (such as tensile strength, bending strength, etc.) and friction and wear properties (such as wear resistance, anti-slip, etc.) of the material.The invention has the advantages of 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 tensile strength of the modified CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material 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); 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%.

[0017] Furthermore, the dosage 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; accurate raw material dosage ratio control is the key to ensure smooth reaction and stable product quality. This ratio range is optimized to enable the raw materials to fully react and form a stable structure, while avoiding the waste of raw materials and the generation of by-products, and improving the utilization rate of raw materials and the cost performance of products.

[0018] Furthermore, the stirring reaction speed is 800-1500r / min; an appropriate stirring speed can ensure sufficient mixing and contact between the reactants and improve the reaction efficiency. At the same time, it avoids local overheating or uneven reaction caused by too high a speed, and insufficient reaction caused by too low a speed, thereby ensuring the uniformity and consistency of the product.

[0019] Furthermore, the temperature of the solvent thermal reaction is 110-130°C and the time is 18-36h; this temperature and time range can ensure the deep reaction between the reactants and form stable chemical bonds and structures. At the same time, it avoids too fast reaction or increased side reactions due to too high temperature, and incomplete reaction due to insufficient time, thereby improving the stability and performance of the product.

[0020] Furthermore, the mass fraction of the phenolic resin ethanol solution is 23%-27%; the vacuum impregnation conditions include: at room temperature, at a pressure of 0.07-0.1MPa, impregnation of 0.07-0.1MPa; the appropriate mass fraction of the phenolic resin ethanol solution can ensure that the carbon cloth fully absorbs the resin to form a dense composite structure. The vacuum impregnation conditions can further improve the impregnation effect, so that the resin can evenly penetrate into each fiber of the carbon cloth, enhance the bonding force between the carbon cloth and the resin, and improve the overall performance of the product.

[0021] Furthermore, the temperature of hot pressing curing is 170-190℃, the pressure is 4-6MPa, and the curing time is 9-13min; this hot pressing curing condition can ensure the full curing of the resin to form a hard and dense composite structure. At the same time, the appropriate temperature and pressure can also promote the further combination between the carbon cloth and the resin, improving the mechanical properties and heat resistance of the product.

[0022] Furthermore, the pretreatment of the carbon fiber cloth includes: firstly immersing the carbon fiber cloth in acetone, washing with deionized water, drying once, then immersing it in a carboxymethyl cellulose solution for a second time, washing with deionized water, and drying for a second time; the pretreatment step can thoroughly clean the surface of the carbon cloth, remove impurities and oil stains, and improve the adhesion between the carbon cloth and the resin. At the same time, the immersion of carboxymethyl cellulose can also serve as a reinforcing agent to further improve the performance of the carbon cloth and the bonding strength with the resin.

[0023] Furthermore, the soaking condition is: soaking for 27-56 hours at room temperature; long soaking can ensure that the carbon cloth fully absorbs acetone, effectively removes impurities and oil stains on the surface, and provides a good foundation for subsequent treatment. At the same time, it avoids incomplete cleaning due to too short soaking time or damage to the carbon cloth performance due to too long soaking time.

[0024] Furthermore, 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 2-4h; the appropriate concentration of carboxymethyl cellulose can ensure that it forms a uniform coating on the surface of the carbon cloth, improve the bonding force between the carbon cloth and the resin and the overall strength of the material. The high temperature conditions of the second soaking can further promote the adhesion and penetration of carboxymethyl cellulose on the surface of the carbon cloth, enhance the performance of the carbon cloth and the bonding force 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 soaking time.

[0025] 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 470.74-554.49MPa, which is 48.63%-75.10% higher than that of the unmodified material; a friction coefficient of 0.111-0.128, which is 16.8%-34.7% higher than that of the unmodified material; and a wear rate of 2.33×10 -12 -6.10×10 - 12 m 3 / (N·m), the wear rate is reduced by 50.5%-81.1% compared with the unmodified material. Compared with the unmodified carbon cloth reinforced resin-based friction material, all performance indicators have been greatly improved, and it has significant advantages in application fields such as high-speed train braking that require high strength and high wear resistance.

[0026] 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 the braking system of high-speed trains, the high strength, high wear resistance and good thermal stability of the material can significantly improve the braking performance and safety, providing strong support for the development of high-speed railways. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 SEM photos of 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; Figure 2 It is a tensile strength comparison diagram of the CMC / UiO66-NH2 synergistic 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 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; Figure 3It is a friction coefficient comparison diagram of the CMC / UiO66-NH2 synergistic 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 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; Figure 4 It is a wear rate comparison chart of the CMC / UiO66-NH2 synergistic lossless 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 synergistic lossless modified carbon cloth reinforced resin friction material prepared in Example 1, C4 is the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material prepared in Example 2, and C5 is the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material prepared in Example 3. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] 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.

[0030] 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.

[0031] In the present invention, unless otherwise specified, percentage (%) or part refers to the weight percentage or weight part relative to the composition.

[0032] 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.

[0033] In the present invention, unless otherwise specified, the numerical range "a~b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "6~22" means that all real numbers between "6~22" have been listed in this document, and "6~22" is just an abbreviation of these numerical combinations.

[0034] The “range” disclosed in the present invention is in the form of a lower limit and an upper limit, which can be one or more lower limits, and one or more upper limits, respectively.

[0035] 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.

[0036] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the sequence. Preferably, the reaction method herein is carried out sequentially.

[0037] Unless otherwise specified, the professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content may also be applied to the present invention.

[0038] The present invention provides a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, the steps are as follows: Step 1: Soak the carbon fiber cloth in acetone at room temperature for pretreatment to remove the sizing agent and impurities on the surface, wash it with deionized water and dry it for later use.

[0039] 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.

[0040] 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 subjected to ultrasonic treatment 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 a mixed solution C for a solvothermal 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.

[0041] 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 using a vulcanizer to obtain a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material.

[0042] Furthermore, the method for pre-treating and removing the surface sizing agent and impurities in step 1 is: soaking the carbon fiber cloth in an acetone solution at room temperature for 27-56 hours.

[0043] 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.

[0044] 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.

[0045] Furthermore, in step 3, the rotation speed of the magnetic stirring mixed liquid C is controlled to be 800-1500 r / min, and 4-20 ml of acetic acid is added dropwise to the mixed liquid using a syringe.

[0046] Furthermore, in step three, the temperature of the solvothermal reaction is 110-130° C., and the time is 18-36 hours.

[0047] Furthermore, in step 4, the mass fraction of the resin is 23%-27%; the conditions for vacuum impregnation include: impregnation for 24-26 hours at room temperature and a pressure of 0.07-0.1 MPa.

[0048] Furthermore, the process parameters of hot pressing curing in step 4 vulcanizing machine are: temperature 170-190°C, pressure 4-6MPa, and curing time 9-13min.

[0049] The invention discloses a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, wherein 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).

[0050] 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, and broadens the application field. It is in line with the concept of green development and provides a high-performance, environmentally friendly friction material solution for fields such as high-speed train braking.

[0051] 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, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually 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 in 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.

[0052] Example 1 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 10g of carbon fiber cloth into acetone, seal it and soak it at room temperature for 48 hours, then wash the carbon fiber cloth with deionized water and dry it; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, wash it twice with deionized water, and dry it for later use; Step 3: At room temperature, 0.216 g of diaminoterephthalic acid was dissolved in 100 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to make the diaminoterephthalic acid uniformly dispersed in the mixed solution A; Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 4 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 1000 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 24 hours at 120° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions were: pressure of 0.08 MPa at room temperature and impregnation time of 24 h. The impregnated preform was placed in an oven and then dried. The CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was obtained by hot pressing and curing in a vulcanizer. The hot pressing curing conditions were as follows: temperature 170°C, pressure 6MPa, and curing time 10min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 470.74MPa; the friction coefficient was 0.111; and the wear rate was 6.1×10 -12 m 3 / (N·m); tensile strength increased by 48.6%, friction coefficient increased by 16.8%, and wear rate decreased by 50.5%.

[0053] Example 2 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 10g of carbon fiber cloth into 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; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, wash it three times with deionized water, and dry it for later use; Step 3: At room temperature, 0.216 g of diaminoterephthalic acid was dissolved in 100 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to make the diaminoterephthalic acid uniformly dispersed in the mixed solution A; Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 12 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 1000 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 24 hours at 120° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions were: pressure of 0.08 MPa at room temperature and impregnation time of 24 h. The impregnated preform was placed in an oven and then dried. The preform was then hot-pressed and cured in a vulcanizer to obtain a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6MPa, and curing time 10min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 554.49MPa; the friction coefficient was 0.128; and the wear rate was 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%.

[0054] Example 3 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 10g of carbon fiber cloth into 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; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 h, wash it three times with deionized water, and dry it for later use; Step 3: At room temperature, 0.216 g of diaminoterephthalic acid was dissolved in 100 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to make the diaminoterephthalic acid uniformly dispersed in the mixed solution A; Step 4: adding 0.28 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 20 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 1000 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 24 hours at 120° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions were: pressure of 0.08 MPa at room temperature and impregnation time of 24 h. The impregnated preform was placed in an oven and then dried. The preform was then hot-pressed and cured in a vulcanizer to obtain a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 170°C, pressure 6MPa, and curing time 10min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 516.56MPa; the friction coefficient was 0.123; and the wear rate was 4.87×10 -12 m 3 / (N·m); tensile strength increased by 63.1%, friction coefficient increased by 29.4%, and wear rate decreased by 60.5%.

[0055] Example 4 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 6g of carbon fiber cloth into acetone, seal it and soak it at room temperature for 27h, then wash the carbon fiber cloth with deionized water three times and dry it; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.3% carboxymethyl cellulose solution at 75° C. for 2 hours, wash it two to three times with deionized water, and then dry it for later use; Step 3: At room temperature, 0.108 g of diaminoterephthalic acid was dissolved in 50 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to make the diaminoterephthalic acid uniformly dispersed in the mixed solution A; Step 4: adding 0.14 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 800 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 18 hours at 110° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 23%. The impregnation conditions were: pressure of 0.07 MPa at room temperature and impregnation time of 24 h. The impregnated preform was placed in an oven and then dried. The CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was obtained by hot pressing and curing in a vulcanizer. The hot pressing curing conditions were as follows: temperature 180°C, pressure 4MPa, and curing time 9min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 480.54MPa; the friction coefficient was 0.115; and the wear rate was 5.9×10 -12 m 3 / (N·m); tensile strength increased by 51.7%, friction coefficient increased by 21.1%, and wear rate decreased by 52.1%.

[0056] Example 5 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 8g of carbon fiber cloth into 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; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.6% carboxymethyl cellulose solution at 95° C. for 4 hours, wash it two to three times with deionized water, and then dry it for later use; Step 3: At room temperature, 0.153 g of diaminoterephthalic acid was dissolved in 80 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to make the diaminoterephthalic acid uniformly dispersed in the mixed solution A; Step 4: adding 0.198 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 1500 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 32 hours at 130° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 27%. The impregnation conditions were: pressure of 0.1 MPa at room temperature and impregnation time of 26 h. The impregnated preform was placed in an oven and then dried. The CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was obtained by hot pressing and curing in a vulcanizer. The hot pressing curing conditions were as follows: temperature 190°C, pressure 5MPa, and curing time 12min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 490.84MPa; the friction coefficient was 0.118; and the wear rate was 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%.

[0057] Example 6 A method for preparing a CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction material comprises the following steps: Step 1: Put 8g of carbon fiber cloth into acetone, seal it and soak it at room temperature for 56 hours, then wash the carbon fiber cloth with deionized water three times and dry it; Step 2: soak the carbon fiber cloth obtained in step 1 in a 0.6% carboxymethyl cellulose solution at 95° C. for 4 hours, wash it two to three times with deionized water, and then dry it for later use; Step 3: At room temperature, 0.185 g of diaminoterephthalic acid was dissolved in 80 mL of N,N-dimethylformamide to obtain a mixed solution A, and the mixed solution A was subjected to ultrasonic treatment to uniformly disperse the diaminoterephthalic acid in the mixed solution A; Step 4: adding 0.239 g of zirconium chloride to the mixed solution A and then performing ultrasonic treatment to obtain a mixed solution B; Step 5: Add 10 mL of acetic acid dropwise to the mixed solution B, stir with a magnetic stirrer at a speed of 1500 r / min, and mix well to obtain a mixed solution C; Step 6: Inject the mixed solution C and the carbon fiber cloth into a 200 mL polytetrafluoroethylene liner, and then fix the liner in a matching stainless steel reactor; Step 7: Fix the stainless steel reactor containing the mixed solution C and the carbon fiber cloth in a homogeneous reactor and react for 36 hours at 130° C. and a rotation speed of 55 r / min to obtain a grafted UiO66-NH2 carbon fiber cloth; The grafted UiO66-NH2 carbon fiber cloth obtained in step 7 is washed with N,N-dimethylformamide and anhydrous ethanol for multiple times to remove unreacted monomers and UiO66-NH2 not grafted on the carbon fiber cloth, and freeze-dried to obtain CMC / UiO66-NH2 synergistically modified carbon fiber cloth; The CMC / UiO66-NH2 synergistically modified carbon fiber cloth was vacuum impregnated in a phenolic resin ethanol solution with a mass fraction of 25%. The impregnation conditions were: pressure of 0.1 MPa at room temperature and impregnation time of 26 h. The impregnated preform was placed in an oven and then dried. The preform was then hot-pressed and cured in a vulcanizer to obtain a CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material. The hot-pressing curing conditions were: temperature 190°C, pressure 6MPa, and curing time 13min. The tensile strength of the obtained CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material was 476.41MPa; the friction coefficient was 0.121; and the wear rate was 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%.

[0058] Comparative Example 1 A method for preparing an unmodified carbon cloth reinforced resin-based friction material comprises the following steps: Step 1: Soak 10g of carbon fiber cloth in acetone at room temperature for 48 hours to remove surface sizing and impurities, wash it repeatedly with deionized water three times and dry it for later use; Step 2: Vacuum impregnate the carbon fiber cloth obtained in step 1 into a phenolic resin ethanol solution with a mass fraction of 25%, and the impregnation conditions are: pressure of 0.08 MPa at room temperature and impregnation time of 24 h; Step 3: The impregnated preform is placed in an oven and then dried. The unmodified carbon cloth reinforced resin-based friction material is obtained by hot pressing and curing with a vulcanizer. The hot pressing curing conditions are: temperature 170°C, pressure 6MPa, and curing time 10min. The tensile strength of the unmodified carbon cloth reinforced resin-based friction material is 316.73MPa; the friction coefficient is 0.095; and the wear rate is 12.33×10 -12 m 3 / (N·m).

[0059] Comparative Example 2 A method for preparing a CMC pretreated carbon cloth reinforced resin-based friction material comprises the following steps: Step 1: Soak 10g of carbon fiber cloth in acetone at room temperature for 48 hours to remove surface sizing and impurities, wash it repeatedly with deionized water three times and dry it for later use; Step 2: soaking the carbon fiber cloth obtained in step 1 in a 0.15% carboxymethyl cellulose solution at 80° C. for 3 hours, washing it with deionized water two to three times, and drying it to obtain a CMC pretreated carbon cloth; Step 3: Vacuum impregnate the carbon fiber cloth obtained in step 2 into a phenolic resin ethanol solution with a mass fraction of 25%, and the impregnation conditions are: the pressure is 0.08 MPa at room temperature and the impregnation time is 24 hours; Step 4: The impregnated preform is placed in an oven and then dried. The preform is 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 are: temperature 170°C, pressure 6MPa, and curing time 10min. The tensile strength of the obtained CMC pretreated carbon cloth reinforced resin-based friction material is 383.37MPa; the friction coefficient is 0.103; and the wear rate is 8.5×10 -12 m 3 / (N·m).

[0060] See also Figure 1 The SEM photos of the CMC / UiO66-NH2 synergistically modified carbon cloth prepared by 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.

[0061] Figure 2It is a tensile strength comparison diagram of the CMC / UiO66-NH2 synergistic 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 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; 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 material is improved, and the tensile strength is increased by 48.63%-75.10%.

[0062] 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 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 the friction coefficient is improved, and the friction coefficient is increased by 16.8%-34.7%.

[0063] Figure 4 It is a comparison chart of the wear rates of the CMC / UiO66-NH2 synergistically non-destructive modified carbon cloth reinforced resin friction materials 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 the wear rate of the friction material decreases after grafting, and the wear rate is reduced by 50.5%-81.1%.

[0064] In summary, the preparation method of the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material of the present invention combines the unique properties of carboxymethyl cellulose (CMC) and high-performance metal organic framework material (UiO66-NH2) to achieve efficient and non-destructive modification of the carbon cloth surface. The interfacial bonding force between the carbon cloth and the resin matrix is ​​successfully enhanced, so that the friction material prepared has achieved significant improvements in mechanical properties, friction coefficient and wear resistance. The friction material not only has excellent tensile strength and can withstand great mechanical stress, but also has a stable friction coefficient and low wear rate, and can maintain excellent performance even under extreme working conditions. These excellent properties make the material have broad application prospects in the fields of high-speed train braking systems, high-performance automotive brake components, etc. The preparation method of the present invention has simple process, convenient operation, and controllable cost, which provides the possibility for large-scale industrial production.

[0065] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 synergistic 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 ultrasonic treatment is performed, and acetic acid is added dropwise. After stirring for reaction, 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 is completed, N, N-dimethylformamide and anhydrous ethanol are used for alternate washing. After freeze-drying, it is vacuum impregnated in a phenolic resin ethanol solution. After drying, it is hot-pressed and cured to obtain CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material.

2. 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 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.

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 800-1500r / 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 synergistic 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 for 24-26 hours at room temperature and a pressure of 0.07-0.1 MPa.

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 min.

7. 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 pretreatment of the carbon fiber cloth includes: firstly immersing the carbon fiber cloth in acetone, washing with deionized water, drying once, then immersing it in a carboxymethyl cellulose solution for a second time, washing with deionized water, and drying it for a second time.

8. The method for preparing the CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material according to claim 7, 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.

9. A CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material, characterized in that: The 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 8, 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).

10. Application of CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material prepared by the preparation method of CMC / UiO66-NH2 synergistic non-destructive modified carbon cloth reinforced resin friction material described in any one of claims 1 to 8 in high-speed train braking.

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