CN114575158A - Preparation method of COF (chip on film) grafted modified carbon cloth/resin-based friction material - Google Patents
Preparation method of COF (chip on film) grafted modified carbon cloth/resin-based friction material Download PDFInfo
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
- D06M11/64—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with nitrogen oxides; with oxyacids of nitrogen or their salts
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
- D06M15/41—Phenol-aldehyde or phenol-ketone resins
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- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/40—Fibres of carbon
Abstract
The invention discloses a preparation method of a COF (chip on film) grafted modified carbon cloth/resin-based friction material, which comprises the following steps: placing the carbon cloth in acetone, and cleaning to remove sizing agent and impurities on the surface of the carbon cloth to obtain original carbon cloth; carbon cloth in HNO3Oxidizing in the solution to obtain functionalized carbon cloth; dissolving melamine and cyanuric chloride in a mixed solution of N, N-dimethylformamide and triethylamine, and uniformly mixing the solution; placing the mixed solution and the acid activated carbon cloth in a reaction kettle for in-situ self-polymerization and grafting reaction of COF to obtain a COF-grafted carbon cloth; soaking the COF modified carbon cloth in a phenolic resin ethanol solution for resin impregnation to obtain a prefabricated body; the prefabricated body is subjected to hot-pressing solidification to obtain COF graftModified carbon cloth/resin based friction material. The surface modification is carried out on the carbon fibers to improve the specific surface area and the surface activity of the carbon fibers, improve the interface bonding strength of the carbon fibers and a resin matrix and improve the friction performance of the friction material.
Description
Technical Field
The invention belongs to the technical field of friction materials, and particularly relates to a preparation method of a COF (chip on film) grafted modified carbon cloth/resin-based friction material.
Background
The carbon cloth/resin-based friction material has the advantages of excellent friction performance, high specific strength, designability of structure and the like, and is widely applied to brakes, clutches and friction transmission devices of various transportation tools and machine equipment. In recent years, with the development of high-speed and heavy-load directions of high-technology equipment, rail transit and vehicles, higher requirements are put forward on the friction performance of the friction materials. However, the smooth and chemically inert surface of the carbon fiber leads to poor interface bonding between the carbon fiber and the resin matrix, and limits the improvement of the friction stability and the service life of the friction material. Therefore, the invention provides the method for modifying the surface of the carbon fiber, enhancing the interface bonding strength of the carbon fiber and a resin matrix, and improving the friction performance of the friction material so as to expand the application of the friction material in the friction field.
Chinese patent No. CN201710661308.4, "a carbon fiber reinforced polypropylene composite material and a method for preparing the same," uses nitric acid to oxidize carbon fibers, so as to improve the surface roughness and surface activity of the carbon fibers, thereby improving the wettability and mechanical engagement of the carbon fibers with a resin matrix to improve the interface bonding strength. However, the strong acid is used for oxidizing the carbon fiber, so that the carbon fiber is damaged to a certain extent, and the strength of the carbon fiber is reduced to a certain extent;
chinese patent with application number CN201710184086.1 'preparation method of titanium dioxide nanorod modified carbon cloth reinforced resin matrix composite material' proposes to inoculate TiO on the surface of carbon fiber2Seed crystallization, then TiO growth by hydrothermal method2The nano-rod increases the surface roughness of the modified carbon fiber, obviously enhances the mechanical meshing effect with a resin matrix, and improves the mechanical property and the tribological property of the prepared carbon cloth reinforced resin matrix composite material to different degrees, but the method only modifies the carbon fiber from the aspect of the surface roughness and has certain limitation;
chinese patent CN201310552131.6, a "carbon fiber surface treatment method", proposes that nitrogen is used as a carbon fiber surface treatment medium to generate low-temperature plasma, and the low-temperature plasma bombards the surface of the carbon fiber, thereby increasing the number and roughness of active functional groups on the surface of the carbon fiber, and improving the interface bonding strength between the carbon fiber and a resin matrix, thereby improving the mechanical properties of the composite material.
Therefore, the problem to be solved by the skilled person is how to provide an effective method for modifying the surface of carbon fiber to improve the interface bonding strength between the carbon fiber and the resin matrix, and further improve the friction performance of the carbon cloth/resin-based friction material.
Disclosure of Invention
Based on the method, the organic porous crystalline COF material is subjected to in-situ self-polymerization and is grafted on the surface of the carbon fiber, so that the specific surface area and the surface activity of the carbon fiber are improved, the interface bonding strength of the carbon fiber and a resin matrix can be improved by virtue of double functions of mechanical engagement and chemical bonding, and the friction performance of the friction material is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a COF graft modified carbon cloth/resin-based friction material is characterized by comprising the following steps:
the method comprises the following steps: soaking and washing the carbon cloth by using acetone and deionized water to remove sizing agent and impurities on the surface of the carbon cloth to obtain clean carbon cloth, and marking the clean carbon cloth as CFs;
step two: placing the CFs obtained in the step one in HNO3Carrying out oxidation treatment in the solution to obtain oxidized carbon cloth which is marked as CFs-COOH;
step three: dissolving melamine in a mixed solution of N, N-dimethylformamide and triethylamine at room temperature to obtain a solution A, and performing ultrasonic treatment on the solution A to uniformly disperse the melamine in the mixed solution of the N, N-dimethylformamide and the triethylamine;
step four: adding cyanuric chloride into the solution A obtained in the third step, performing ultrasonic treatment and stirring to uniformly mix reaction monomers to obtain a gel-like solution B, transferring the solution B into a polytetrafluoroethylene lining filled with CFs-COOH, and placing the solution B into a matched stainless steel reaction kettle;
step five: placing the stainless steel reaction kettle filled with the solution B and the CFs-COOH in the fourth step in a homogeneous reactor, and carrying out in-situ polymerization and grafting on the COF on the surface of the carbon fiber under certain conditions to obtain a grafted COF modified carbon cloth, wherein the grafted COF modified carbon cloth is marked as CFs-COF;
step six: washing the CFs-COF obtained in the fifth step for multiple times by using absolute ethyl alcohol and deionized water to remove unreacted monomers and COF which is not grafted to the surface of the carbon fiber;
step seven: drying the CFs-COF obtained in the sixth step to finally obtain a COF grafted modified carbon cloth;
step eight: soaking the COF modified carbon cloth in a phenolic resin ethanol solution, and placing the carbon cloth in a vacuum impregnation box for resin impregnation;
step nine: and (3) performing hot-pressing solidification on the preform obtained by impregnation on a hot press to obtain the COF grafted modified carbon cloth/resin-based friction material.
Further, in the first step, the carbon cloth is placed in an acetone solution to be soaked for 48 hours, then is washed for 3-5 times by deionized water, and the cleaned carbon cloth is placed in a blast drying box to be dried for 12 hours at the temperature of 60 ℃;
further, HNO used in the second step3The concentration is 68 percent, the reaction temperature is 90 ℃, and the reaction time is 3 hours;
further, the mass of the melamine in the third step is 0.255g to 0.655g, the volume of the N, N-Dimethylformamide (DMF) is 50mL to 60mL, and triethylamine (Et)3N) is 1g to 1.5g, and the ultrasonic treatment time of the mixed solution is 10 min;
further, in the fourth step, the mass of the cyanuric chloride is 0.358 g-0.920 g, and after the cyanuric chloride is added, the mixed solution is subjected to ultrasonic treatment and is stirred for 10 min;
further, setting the temperature of the homogeneous phase reactor in the fifth step to be 120 ℃, the rotating speed to be 70r/min and the reaction time to be 24 hours;
further, the drying conditions in the seventh step are as follows: the temperature is 60 ℃, and the time is 12-18 h.
Further, the dipping conditions in the step eight are as follows: the dipping solution is phenolic resin ethanol solution with the mass fraction of 25%, the dipping vacuum degree is 0.08MPa, the dipping time is 24h, and the mass fraction of the resin in the prefabricated body reaches 20-25%.
Further, the hot pressing conditions in the ninth step are as follows: the pressure is 0.5MPa, the temperature is 170 ℃, the hot-pressing curing time is 10min, and the thickness of the composite material is controlled to be 0.4 mm.
The invention has the beneficial effects that:
according to the invention, the organic porous crystalline COF material is polymerized and grafted on the surface of the carbon fiber in situ, so that the specific surface area and the surface activity of the carbon fiber are improved, the interface bonding strength of the carbon fiber and a resin matrix is improved, and the friction performance of the friction material is improved. The COF is a porous crystalline material and contains more active groups (-NH)2and-NH-), thereby significantly increasing the specific surface area and surface activity of the carbon fiber, improving the interface bonding strength of the carbon fiber and the resin matrix by means of the dual functions of mechanical engagement and chemical bonding, and significantly improving the frictional wear performance of the carbon cloth/resin-based friction material.
Drawings
In order to illustrate the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only the present embodiments of the invention, and other drawings can be obtained by those skilled in the art without creative efforts based on the provided drawings.
FIG. 1 is a diagram of the flow and grafting mechanism of COF graft-modified carbon fiber according to the present invention;
FIG. 2 is an SEM image of the surface topography of carbon fibers before and after COF grafting modification of the invention, (a) an SEM image of unmodified carbon fibers; (b) SEM image of modified carbon fiber of example 1; (c) SEM image of modified carbon fiber of example 2;
FIG. 3 is FTIR spectra of CFs, COF powders and CFs-COF of the present invention;
FIG. 4 is a curve of the change of the friction coefficient of the carbon cloth/resin-based friction material before and after COF grafting modification along with time at a stainless steel ball head of 6mm, 5N and 500 t/min.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Covalent organic framework polymers (COFs) are porous crystalline organic materials composed of organic building blocks linked by covalent bonds. The COF has a regular and ordered pore structure, so that the COF has a large specific surface area; meanwhile, the COF material is formed by polycondensation of monomers containing multiple active functional groups and is rich in multiple active functional groups; the COF is connected through covalent bonds, so that the COF has high chemical stability and thermal stability. By grafting COF on the surface of the carbon fiber, a resin macromolecular chain can be wound with COF pores, and the mechanical engagement effect of the carbon fiber and the resin is improved through heating and curing; in addition, the COF grafted on the surface of the carbon fiber is rich in a large number of active functional groups (-NH)2and-NH-), and can generate chemical bonding effect in the hot-pressing curing process of the resin matrix. Therefore, the carbon fibers and the resin matrix form dual functions of mechanical engagement and chemical bonding through the grafted COF, so that the interface bonding strength is improved, and the friction performance of the friction material is further improved.
Therefore, the invention provides a preparation method of a COF (chip on film) graft modified carbon cloth/resin-based friction material, wherein a porous crystalline polymer COF is grafted on the surface of carbon fibers by an in-situ polymerization method so as to improve the interface bonding strength of the carbon fibers and a resin matrix and improve the friction performance of the friction material. The COF is a porous crystalline material and contains more active groups (-NH)2and-NH-), the surface energy and the specific surface area of the carbon fiber can be obviously improved, the growth density of COF on the surface of the carbon fiber is controlled by adjusting the growth process, so that the interface bonding strength is improved by the carbon fiber and the resin matrix under the double actions of mechanical meshing and chemical bonding, and the friction and wear performance of the carbon cloth/resin matrix friction material is obviously improved.
Example 1
Referring to fig. 1, this embodiment provides a preparation method of a COF graft-modified carbon cloth/resin-based friction material, including the following steps:
the method comprises the following steps: soaking the carbon cloth in acetone for 48 hours, and washing the carbon cloth for 3-5 times by using deionized water to remove sizing agents and impurities on the surface of the carbon cloth, so as to obtain the carbon cloth which is cleaned cleanly and marked as CFs;
step two: the CFs obtained in the first step are treated with 68% HNO3Carrying out oxidation treatment for 3h at 90 ℃ in the solution to obtain oxidized carbon cloth, and marking the carbon cloth as CFs-COOH;
step three: 0.455g of melamine was dissolved in 50ml of N-Dimethylformamide (DMF) and 1.5g of triethylamine (Et) at room temperature3N) to obtain a solution A, and carrying out ultrasonic treatment on the solution A for 10min to uniformly disperse melamine in DMF and Et3N mixed solution;
step four: adding 0.639g of cyanuric chloride into the solution A obtained in the third step, performing ultrasonic treatment and stirring to uniformly mix reaction monomers to obtain a gel-like solution B, transferring the solution B into 100mL of a polytetrafluoroethylene lining filled with CFs-COOH, and placing the solution B in a matched stainless steel reaction kettle;
step five: placing the stainless steel reaction kettle filled with the solution B and the CFs-COOH in the fourth step in a homogeneous reactor, reacting for 24 hours at the temperature of 120 ℃ and the rotating speed of 70r/min, and carrying out in-situ polymerization and grafting on the COF on the surface of the carbon fiber to obtain a carbon cloth grafted with the COF, wherein the carbon cloth is marked as CFs-COF-1;
step six: washing the CFs-COF-1 obtained in the fifth step for multiple times by using absolute ethyl alcohol and deionized water to remove unreacted monomers and COF which is not grafted to the surface of the carbon fiber;
step seven: drying the CFs-COF-1 obtained in the sixth step at 60 ℃ for 12h to finally obtain COF grafted carbon cloth;
step eight: and (3) placing the COF modified carbon cloth in a phenolic resin ethanol solution with the mass fraction of 25% and placing the carbon cloth in a vacuum impregnation box for resin impregnation. The dipping conditions are as follows: the impregnation pressure is 0.08MPa, the impregnation time is 24 hours, and the resin impregnation amount is 20-25%.
Step nine: and (3) performing hot-pressing solidification on the prefabricated body obtained by impregnation on a hot press to obtain the modified carbon cloth/resin-based friction material. Hot-pressing curing conditions: the pressure is 0.5MPa, the temperature is 170 ℃, the hot-pressing curing time is 10min, and the thickness of the composite material is controlled to be 0.4 mm. The sample prepared in this example is labeled C1.
The SEM image of the unmodified carbon fiber is shown in fig. 2(a), the SEM image of the modified carbon fiber of the present embodiment is shown in fig. 2(b), and it can be seen from the image (b) that the surface of the carbon fiber has laminated COF; from fig. 3, it can be seen that the surface of the modified carbon fiber contains a characteristic absorption peak of COF, which proves that there is COF material on the surface of the carbon fiber. The friction coefficient of the modified carbon cloth/resin-based friction material is 0.205, and the wear rate is 1.63 multiplied by 10-12m3(N·m)-1。
Example 2
The method comprises the following steps: soaking the carbon cloth in acetone for 48 hours, and washing the carbon cloth for 3-5 times by using deionized water to remove sizing agents and impurities on the surface of the carbon cloth, so as to obtain the carbon cloth which is cleaned cleanly and marked as CFs;
step two: the CFS obtained in the step one is treated with 68% HNO3Carrying out oxidation treatment for 3h at 90 ℃ in the solution to obtain oxidized carbon cloth, and marking the oxidized carbon cloth as CFs-COOH;
step three: 0.655g of melamine were dissolved in 50ml of N, N-Dimethylformamide (DMF) and 1.5g of triethylamine (Et) at room temperature3N) to obtain a solution A, and performing ultrasonic treatment on the solution A for 10min to uniformly disperse melamine in DMF and Et3N mixed solution;
step four: adding 0.920g of cyanuric chloride into the solution A obtained in the step three, performing ultrasonic treatment and stirring to uniformly mix reaction monomers to obtain a gel-like solution B, transferring the solution B into 100mL of a polytetrafluoroethylene lining filled with CFs-COOH, and placing the solution B into a matched stainless steel reaction kettle;
step five: placing the stainless steel reaction kettle filled with the solution B and the CFs-COOH in the fourth step in a homogeneous reactor to react for 24 hours at the temperature of 120 ℃ and the rotating speed of 70r/min, and polymerizing COF in situ on the surface of the carbon fiber to obtain carbon cloth grafted with COF, wherein the carbon cloth is marked as CFs-COF-2;
step six: washing the CFs-COF-2 obtained in the fifth step for multiple times by using absolute ethyl alcohol and deionized water to remove unreacted monomers and COF which is not grafted to the surface of the carbon fiber;
step seven: drying the CFs-COF-2 obtained in the sixth step at 60 ℃ for 12 hours to finally obtain COF grafted carbon cloth;
step eight: and (3) placing the COF modified carbon cloth in a phenolic resin ethanol solution with the mass fraction of 25% and placing the carbon cloth in a vacuum impregnation box for resin impregnation. The dipping conditions are as follows: the impregnation pressure is 0.08MPa, the impregnation time is 24 hours, and the resin impregnation amount is 20-25%.
Step nine: and (3) performing hot-pressing solidification on the prefabricated body obtained by impregnation on a hot press to obtain the modified carbon cloth/resin-based friction material. Hot-pressing curing conditions: the pressure is 0.5MPa, the temperature is 170 ℃, the hot-pressing curing time is 10min, and the thickness of the composite material is controlled to be 0.4 mm. The sample prepared in this example is labeled C2.
The SEM image of the modified carbon fiber of this example is shown in fig. 2(c), from which it can be seen that there is a laminated COF on the surface of the carbon fiber; from fig. 3, it can be seen that the surface of the modified carbon fiber contains a characteristic absorption peak of COF, which proves that there is COF material on the surface of the carbon fiber. The friction coefficient of the prepared carbon cloth/resin-based friction material is 0.235, and the wear rate is 2.97 multiplied by 10-12m3(N·m)-1。
The grafting material COF has larger porosity and contains more active functional groups (-NH)2-NH-), and the two-dimensional COF material has a graphite-like lamellar structure. The porous structure of COF can improve the specific surface area of carbon fiber, effectively improves the wettability of carbon fiber, and the porous structure can take place mechanical meshing effect with resin macromolecule chain to its active functional group that contains can take place chemical reaction with the resin matrix, consequently promotes the interface bonding strength of carbon fiber and resin matrix under mechanical meshing and chemical bonding dual function, and then improves this friction material's frictional wear performance.
As shown in FIG. 4 and Table 1, the unmodified carbon cloth/resin-based friction material has a dynamic friction coefficient of 0.12-0.18 and a wear rate of 5.67X 10-12m3(N·m)-1(ii) a COF graft modified carbon cloth/resinThe dynamic friction coefficient of the base friction material is 0.18-0.25, and the wear rate is 1.63 multiplied by 10-12m3(N·m)-1(ii) a The friction coefficient of the COF grafted modified carbon cloth/resin-based friction material is improved, and the wear rate is reduced by about 71.25%. Therefore, the COF grafted modified carbon cloth/resin-based friction material shows more excellent friction performance, and the invention has wide application prospect in the wet braking friction material industry. Table 1 shows the data related to the frictional properties of the carbon cloth/resin-based friction material before and after COF graft modification of the present invention.
TABLE 1
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A preparation method of a COF graft modified carbon cloth/resin-based friction material is characterized by comprising the following steps:
the method comprises the following steps: soaking and washing the carbon cloth by using acetone and deionized water to remove sizing agent and impurities on the surface of the carbon cloth to obtain clean carbon cloth, and marking the clean carbon cloth as CFs;
step two: will step withCFs obtained in step one are subjected to HNO3Carrying out oxidation treatment in the solution to obtain oxidized carbon cloth which is marked as CFs-COOH;
step three: dissolving melamine in a mixed solution of N, N-dimethylformamide and triethylamine at room temperature to obtain a solution A, and performing ultrasonic treatment on the solution A to uniformly disperse the melamine in the mixed solution of N, N-dimethylformamide and triethylamine;
step four: adding cyanuric chloride into the solution A obtained in the third step, performing ultrasonic treatment and stirring to uniformly mix reaction monomers to obtain a gel-like solution B, transferring the solution B into a polytetrafluoroethylene lining filled with CFs-COOH, and placing the solution B in a matched stainless steel reaction kettle;
step five: placing the stainless steel reaction kettle filled with the solution B and the CFs-COOH in the fourth step into a homogeneous reactor, carrying out in-situ polymerization and grafting on the COF on the surface of the carbon fiber under certain conditions, and obtaining a carbon cloth modified by the grafted COF after the reaction is finished, wherein the carbon cloth is marked as CFs-COF;
step six: washing the CFs-COF obtained in the fifth step for multiple times by using absolute ethyl alcohol and deionized water to remove unreacted monomers and COF which is not grafted to the surface of the carbon fiber;
step seven: drying the CFs-COF obtained in the sixth step to finally obtain a COF-grafted carbon cloth;
step eight: soaking the COF modified carbon cloth in a phenolic resin ethanol solution, and placing the carbon cloth in a vacuum impregnation box for resin impregnation;
step nine: and (3) performing hot-pressing solidification on the preform obtained by impregnation on a hot press to obtain the COF grafted modified carbon cloth/resin-based friction material.
2. The method for preparing the COF grafted and modified carbon cloth/resin-based friction material according to claim 1, wherein the first step is to soak the carbon cloth in an acetone solution for 48 hours, then wash the carbon cloth with deionized water for 3-5 times, and dry the cleaned carbon cloth in a forced air drying oven at 60 ℃ for 12 hours.
3. The method for preparing COF grafted modified carbon cloth/resin based friction material according to claim 1The preparation method is characterized in that HNO used in the step two3The concentration is 68 percent, the reaction temperature is 90 ℃, and the reaction time is 3 hours.
4. The preparation method of the COF grafted and modified carbon cloth/resin-based friction material according to claim 1, wherein the mass of melamine in the step three is 0.255 g-0.655 g, the volume of N, N-dimethylformamide is 50 mL-60 mL, the mass of triethylamine is 1 g-1.5 g, and the ultrasonic treatment time of the mixed solution is 10 min.
5. The method for preparing the COF grafted and modified carbon cloth/resin-based friction material according to claim 1, wherein the mass of the cyanuric chloride in the step four is 0.358g to 0.920g, and after the cyanuric chloride is added, the mixed solution is subjected to ultrasonic treatment and stirred for 10 min.
6. The method for preparing the COF grafted and modified carbon cloth/resin-based friction material according to claim 1, wherein the temperature of the homogeneous reactor set in the fifth step is 120 ℃, the rotating speed is 70r/min, and the reaction time is 24 h.
7. The method for preparing a COF grafted modified carbon cloth/resin-based friction material according to claim 1, wherein the drying conditions in the seventh step are as follows: the temperature is 60 ℃, and the time is 12-18 h.
8. The method for preparing a COF grafted and modified carbon cloth/resin-based friction material according to claim 1, wherein the dipping conditions in the step eight are as follows: the dipping solution is phenolic resin ethanol solution with the mass fraction of 25%, the dipping vacuum degree is 0.08MPa, the dipping time is 24h, and the mass fraction of the resin in the prefabricated body reaches 20-25%.
9. The method for preparing a COF grafted modified carbon cloth/resin-based friction material according to claim 1, wherein the hot pressing conditions in the ninth step are as follows: the pressure is 0.5MPa, the temperature is 170 ℃, the hot-pressing curing time is 10min, and the thickness of the composite material is controlled to be 0.4 mm.
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