CN115975336A - A kind of low-noise friction material and its preparation method and application - Google Patents

Abstract

The invention belongs to the technical field of friction material preparation, and particularly relates to a low-noise friction material and a preparation method and application thereof. The coating comprises the following components in parts by mass: 5-20 parts of modified phenolic resin, 2-10 parts of aramid fiber, 1-4 parts of potassium titanate whisker, 5-15 parts of glass fiber, 3-15 parts of modified gel vermiculite, 3-7 parts of rubber powder, 15-30 parts of graphite, 2-10 parts of alumina and 20-40 parts of barium sulfate; wherein, the modified gel vermiculite is prepared by mixing gel vermiculite with petroleum coke particles. According to the invention, the petroleum coke particles with high porosity are adhered to the inside and the surface of the pores of the gel vermiculite, so that the porosity of the modified gel vermiculite is increased, and the modified gel vermiculite is matched with other components, so that the generation of friction noise can be obviously improved, the braking noise is reduced, and the petroleum coke particles form friction particles of the gel vermiculite, so that the wear resistance of the gel vermiculite is improved, and the petroleum coke particles are matched with aramid fibers and the like, so that the friction coefficient of the brake pad at normal temperature and high temperature can be maintained stable, and the wear of friction materials is reduced.

Description

A kind of low noise friction material and its preparation method and application

technical field

The invention relates to the technical field of friction material preparation, in particular to a low-noise friction material and its preparation method and application.

Background technique

Any mechanical equipment and various moving vehicles must have braking or transmission devices. Friction material is the key material on this kind of braking or transmission device. Its function is to absorb or transmit power through friction, such as the clutch plate transmits power, and the brake plate absorbs kinetic energy. The performance of friction material is directly related to the reliability and stability of vehicle operation. At present, friction materials are often composed of multi-component composite materials such as polymer binders (resin or rubber), reinforcing fibers, friction performance modifiers and other ingredients, which are required to have sufficient and stable friction coefficients, and the difference between dynamic and static friction coefficients is small. , has good thermal conductivity and certain high-temperature mechanical strength, has good anti-friction performance and anti-adhesion performance, and can meet the performance requirements of vehicle or mechanical transmission and braking. In recent years, with the rapid development and popularization of new energy vehicles, since new energy vehicles do not have engines and are replaced by motors, there is almost no noise during driving, which puts forward new requirements for friction materials, that is, to improve braking or braking Noise, low-noise brake pads have become an important performance index of friction materials for new energy vehicle brake pads.

At present, some studies have made a series of improvements to the noise problems of brake pad friction materials, mainly by reducing metal components and adding noise reduction components, and some progress has been made. However, with the continuous advancement of technology, there is more impact on the performance of friction materials These methods have gradually exposed some shortcomings. Among them, the reduction of metal components will directly lead to the increase of noise reduction components related to the increase of friction matrix porosity, resulting in accelerated wear of brake pads at room temperature and high temperature, and rapid attenuation of friction coefficient. Stable friction coefficient and stable comparison cannot be achieved at high temperatures. Little wear and tear. Therefore, under the premise of ensuring the performance of brake pads, it is necessary to find safer and more effective friction materials to replace heavy metals, so as to meet the requirements of noise reduction, wear resistance and stable friction coefficient.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a low-noise friction material and its preparation method, and provides the application of the low-noise friction material in the preparation of brake pads or brake pads, with the purpose of solving the problems in the prior art. Part of the problems or at least alleviate some of the problems in the prior art.

To achieve the above object, the present invention is specifically realized through the following technical solutions:

The first aspect of the present invention provides a low-noise friction material, which comprises the following components in parts by mass: 5-20 parts of modified phenolic resin, 2-10 parts of aramid fibers, 1-4 parts of potassium titanate whiskers, 5-15 parts of glass fiber, 3-15 parts of modified gel vermiculite, 3-7 parts of rubber powder, 15-30 parts of graphite, 2-10 parts of aluminum oxide and 20-40 parts of barium sulfate; wherein, the modified The permanent gel vermiculite is made by mixing gel vermiculite and petroleum coke particles.

Further, the following components are included in parts by mass: 14 parts of modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whiskers, 5 parts of glass fiber, 6 parts of modified gel vermiculite, rubber 3 parts of powder, 25 parts of graphite, 10 parts of alumina and 30 parts of barium sulfate.

Further, the modified phenolic resin is cashew nut shell oil modified phenolic resin.

Further, the preparation method of the modified gel vermiculite comprises:

S11, mixing water glass and flaky vermiculite evenly in a mass ratio of 7:4;

S12. Adding 1-2% of the mass of alkali to the mixture in step S11 until a gel is formed, leaving the gel for aging, and then drying to obtain gel vermiculite;

S13, uniformly mixing the gel vermiculite and petroleum coke particles at a mass ratio of 7:3 to obtain the modified gel vermiculite.

Furthermore, the density of the modified gel vermiculite is 0.08-0.2g/cm ³ , the melting point is 1379-1400°C, and the thermal conductivity is 0.04-0.06kcal/m ² h°C.

Further, the particle diameter of the modified gel vermiculite is 0.5-1.5 mm, and further, the particle diameter of the modified gel vermiculite is 0.8 mm.

The second aspect of the present invention provides the above-mentioned S21, ingredients: weigh each component in proportion, pre-mix the modified gel vermiculite and aramid fiber, then add other components, and mix evenly;

S22. Hot press molding: hot press molding the mixture in step S21 to obtain a prefabricated part;

S23. Post-curing treatment: performing post-curing treatment after drying the preform to obtain a low-noise friction material.

Further, in step S22, the hot press forming operation includes: the forming temperature is 160°C, the pre-pressing time is 10s, the pressure release and exhaust time is 5s, the number of pressure release and exhaust is 5 times, and the hot press pressure is 10MPa, The pressing time is 10 min.

Further, in step S23, the post-curing treatment operation includes: keeping the temperature at 160° C. for 10 hours.

The third aspect of the present invention provides the above-mentioned low-noise friction material in the manufacture of brake pads or the application of the brake pads.

Advantage of the present invention and positive effect are:

1. The present invention adopts the modified gel vermiculite prepared by mixing gel vermiculite and petroleum coke particles as a functional reinforcing filler. Petroleum coke particles with high porosity adhere to the interior and surface of the gel vermiculite, increasing the The porosity of the modified gel vermiculite is beneficial to improve its sound-absorbing effect. Cooperating with other components can significantly improve the generation of friction noise of friction materials, so that the brake pads made can greatly reduce brake noise and improve braking comfort.

2. The present invention mixes the modified gel vermiculite with aramid fibers and other components. On the one hand, the petroleum coke particles adhere to the gel vermiculite and the surface to form the friction particles of the gel vermiculite, which improves the Its wear resistance and reduce the wear of friction materials; on the other hand, aramid fibers are soft in texture, and their multi-branch and multi-antenna structure can also be well filled and linked to the modified gel vermiculite and the microstructure of the friction material matrix. The porous structure can increase the strength and further reduce wear, maintain the friction coefficient of the brake pad at room temperature and high temperature, and reduce the wear of friction materials.

Detailed ways

In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be described in further detail below in conjunction with the examples, and the equipment and reagents used in each embodiment and test example can be obtained from commercial sources unless otherwise specified. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

From the information contained herein, various changes in the precise description of the invention will readily become apparent to those skilled in the art without departing from the spirit and scope of the appended claims. It should be understood that the scope of the present invention is not limited to the processes, properties or components defined, since these embodiments, as well as other descriptions, are only intended to illustrate certain aspects of the invention. In fact, various changes to the embodiments of the present invention that can be obviously made by those skilled in the art or related fields fall within the scope of the appended claims.

In order to better understand the present invention but not to limit the scope of the present invention, all figures representing dosage, percentage, and other numerical values used in this application should be understood as being modified by the word "about" in all cases. Accordingly, unless expressly indicated otherwise, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At a minimum, each numerical parameter should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below.

An embodiment of the present invention provides a low-noise friction material, which comprises the following components in parts by mass: 5-20 parts of modified phenolic resin, 2-10 parts of aramid fiber, 1-4 parts of potassium titanate whiskers, glass 5-15 parts of fiber, 3-15 parts of modified gel vermiculite, 3-7 parts of rubber powder, 15-30 parts of graphite, 2-10 parts of aluminum oxide and 20-40 parts of barium sulfate; wherein, the modified Gel vermiculite is made by mixing gel vermiculite and petroleum coke particles.

In this embodiment, the modified phenolic resin is usually modified with cashew nut shell oil. The phenolic resin is used as a binder for the friction material to bond the various components into a whole. The phenolic resin (PR) has higher mechanical strength. , good heat resistance and dimensional stability, cheap raw materials and easy processing, etc., is the most commonly used matrix resin for polymer-based friction materials. Aramid fibers and potassium titanate whiskers are used in combination to reduce the hardness of the friction material while improving thermal stability and thermal recession resistance. Glass fibers are used as reinforcing fibers to increase the strength of friction materials, thereby enhancing wear resistance. Rubber powder and graphite are used as lubricants to reduce the change in coefficient of friction during braking. Aluminum oxide is used as an abrasive to increase the coefficient of friction of friction materials. Barium sulfate is used as an inorganic filler to improve the thermal stability and thermal recession of friction materials. As a functional reinforcing filler, the modified gel vermiculite has a good sound-absorbing effect in its porous structure, and when combined with other components, it can significantly improve the friction noise of the friction material, making the brake pads made greatly reduce the brake noise , which improves the braking comfort; and the modified gel vermiculite is mixed with aramid fiber and other components. On the one hand, the modified gel vermiculite itself is composed of petroleum coke particles and gel vermiculite, and the petroleum coke particles It has a porous particle structure and good adsorption. After it is mixed with gel vermiculite, it will adhere to the pores and surface of gel vermiculite to reduce the wear of vermiculite. On the other hand, aramid fiber is soft , its multi-branch and multi-antenna structure can also well fill and link the porous structure of the modified gel vermiculite and the friction material matrix, which can increase the strength and further reduce wear, and is beneficial to maintain the brake pads in the The friction coefficient is stable at room temperature and high temperature, reducing the wear of friction materials.

In order to better balance the improvement of noise reduction performance and wear resistance performance, preferably, in terms of parts by mass, the following components are included: 14 parts of modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whiskers, 5 parts of glass fiber, 6 parts of modified gel vermiculite, 3 parts of rubber powder, 25 parts of graphite, 10 parts of alumina and 30 parts of barium sulfate.

The above-mentioned modified phenolic resin is cashew nut shell oil modified phenolic resin. Cashew shell oil modified phenolic resin can improve the interfacial bonding of inorganic fibers and filler particles such as graphite, alumina, barium sulfate, modified gel vermiculite, etc. in brake pads, resulting in thermal decomposition, thermal recession and Thermal cracking is reduced, effectively improving its wear resistance and mechanical properties.

The noise reduction effect of using gel vermiculite is better than that of vermiculite, but adding it to the friction material in the form of gel alone will easily cause greater wear and tear of the product, which will reduce the noise reduction performance and fail to achieve the desired effect. The present invention first generates gel on the surface of flaky vermiculite through the reaction of water glass and alkali, then ages to obtain gel vermiculite with porous structure, and then blends it with petroleum coke particles to make the gel vermiculite with porous structure Petroleum coke particles with high porosity are adhered to the pores and surfaces of the stone, on the one hand, the porosity of the modified gel vermiculite is improved, and the modified gel vermiculite with rich pore structure is obtained. The modified gel vermiculite prepared by the method of the present invention The density of vermiculite is 0.08-0.2g/cm ³ , the melting point is 1379-1400°C, and the thermal conductivity is 0.04-0.06kcal/m ² h°C, which can improve the noise reduction ability. On the other hand, Petroleum coke particles constitute the friction particles of gel vermiculite, which plays a role in improving its wear resistance and reducing the wear of friction materials. Specifically, the preparation method of the modified gel vermiculite comprises:

S11, mixing water glass and flaky vermiculite evenly in a mass ratio of 7:4;

S12. Adding 1-2% of the mass of alkali to the mixture in step S11 until a gel is formed, leaving the gel for aging, and then drying to obtain gel vermiculite;

S13, uniformly mixing the gel vermiculite and petroleum coke particles at a mass ratio of 7:3 to obtain the modified gel vermiculite.

Wherein, in step S13, the gel vermiculite and petroleum coke particles are uniformly mixed with a mass ratio of 7:3 by a plow-type mixer, thereby utilizing the small internal space energy of the plow-type mixer, The particle diameter of the gel vermiculite is reduced, and under pressure extrusion, it is beneficial for coke particles to evenly adhere to the gel vermiculite.

Optionally, the particle diameter of the modified gel vermiculite is 0.5-1.5 mm. Through the three-factor three-level orthogonal experiment on the modified gel vermiculite particle size, vermiculite content and resin content, the level settings of each factor are shown in Table 1, and the experimental group settings and experimental results are shown in Table 2, taking A1B2C3 group as an example , A1 indicates that the modified gel vermiculite content is 35%, B2 indicates that the modified gel vermiculite particle size is 0.80mm, and C3 indicates that the resin type is selected from cashew nut shell oil high temperature resistant modified phenolic resin, and the content is 65%, except Except for the aforementioned three factors, the remaining components such as aramid fibers and potassium titanate whiskers remain the same. It was found that when the modified gel vermiculite particles increased from 0.56mm to 0.80mm, the impact strength showed an increasing trend, but when the particles further increased from 0.80mm to 1.25mm, the strength decreased slightly, and the particle size was 0.80mm. mm is the best, at this time the impact strength is the largest and the impact resistance is the best. Therefore, the particle diameter of the modified gel vermiculite is preferably 0.56-1.25mm, more preferably 0.8mm.

Table 1 Level setting of each factor

Table 2 Experimental grouping settings and experimental results

Material code Z1 Z2 Z3 Z4 Z5 Experimental protocol A1B2C3 A2B1C3 A2B2C3 A2B3C3 A3B2C3 Modified gel vermiculite content (%) 35 45 45 45 55 Modified gel vermiculite particle size (mm) 0.80 0.56 0.80 1.25 0.80 Cashew nut shell oil modified phenolic resin content (%) 65 55 55 55 45 <![CDATA[Impact Strength J/cm²]]> 4.26 3.82 4.08 3.85 3.92

Based on the same inventive concept, another embodiment of the present invention provides a method for preparing the above-mentioned low-noise friction material, including the following steps:

S21. Ingredients: Weigh each component in proportion, premix the modified gel vermiculite and aramid fiber, then add other components and mix evenly;

S22. Hot press molding: hot press molding the mixture in step S21 to obtain a prefabricated part;

S23. Post-curing treatment: performing post-curing treatment after drying the preform to obtain a low-noise friction material.

In this example, aramid fiber and gel vermiculite are premixed separately first, and then mixed with other components. The soft texture, high strength, and high temperature resistance of aramid fiber can be used to make aramid fiber The multi-branch and multi-antenna structure fills the pores of the modified gel vermiculite, and then mixes with other components. The aramid fiber acts as a link network, fixes the modified gel vermiculite in the friction material matrix structure, and fills the link matrix structure The pores in it, thus, increase the strength of the matrix, reduce the wear of the modified gel vermiculite and the matrix, and greatly improve the wear resistance at room temperature and high temperature. The preparation method of the low-noise friction material has the same advantages as the above-mentioned low-noise friction material over the prior art, and will not be repeated here.

In step S21, a plow type mixer is used for stirring and mixing, so that each component is fully dispersed and mixed uniformly.

In step S22, the hot press molding operation includes: the molding temperature is 160°C, the pre-pressing time is 10s, the pressure relief and exhaust time is 5s, the number of pressure relief and exhaust is 5 times, the hot pressing pressure is 10MPa, and the pressing time is 10min.

In step S23, the post-curing treatment operation includes: keeping the temperature at 160° C. for 10 hours.

Based on the same inventive concept, another embodiment of the present invention provides the above-mentioned low-noise friction material in the manufacture of brake pads or the application of the brake pads.

The application of the low-noise friction material in the preparation of brake pads or brake pads is the same as the above-mentioned low-noise friction material over the prior art, and will not be repeated here.

Below in conjunction with specific embodiment, further illustrate the present invention. The experimental methods not indicating specific conditions in the following examples are generally in accordance with the conditions suggested by the manufacturer.

Example 1

A method for preparing a low-noise friction material, comprising the following steps:

S21. Ingredients: Weigh each component in proportion, including 14 parts of cashew shell oil modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whisker, 5 parts of glass fiber, and 6 parts of modified gel vermiculite parts, 3 parts of rubber powder, 25 parts of graphite, 10 parts of alumina, and 30 parts of barium sulfate. The mixer is used for stirring and mixing, so that various materials are fully dispersed and mixed evenly;

S22. Hot press molding: Put the mixture in step S21 into a four-column hydraulic press for hot press molding. The molding temperature is 160° C., the pre-pressing time is 10 s, the pressure release and exhaust time is 5 s, and the number of pressure release and exhaust is 5 times. The compression pressure is 10MPa, and the compression time is 10min to obtain the prefabricated part;

S23. Post-curing treatment: After the preform is dried, place it in an electric heating constant temperature blast drying oven, heat it at 160° C. for 10 hours, and then perform curing treatment to obtain a low-noise friction material.

The preparation method of the modified gel vermiculite used above-mentioned may further comprise the steps:

S11, mixing water glass and flaky vermiculite evenly in a mass ratio of 7:4;

S12. Add dropwise an alkali accounting for 2% of the mass of the mixture to the mixture in step S11 until a gel is formed, place the gel for aging, and then dry to obtain gel vermiculite;

S13. Put the gel vermiculite and the petroleum coke particles into the rake mixer according to the mass ratio of 7:3, and mix them to obtain the modified gel vermiculite with a particle diameter of 0.8mm.

Example 2

A method for preparing a low-noise friction material, comprising the following steps:

S21. Ingredients: Weigh each component in proportion, including 14 parts of cashew shell oil modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whisker, 5 parts of glass fiber, and 5 parts of modified gel vermiculite parts, 3 parts of rubber powder, 25 parts of graphite, 10 parts of alumina, and 31 parts of barium sulfate. The mixer is used for stirring and mixing, so that various materials are fully dispersed and mixed evenly;

S22. Hot press molding: Put the mixture in step S21 into a four-column hydraulic press for hot press molding. The molding temperature is 160° C., the pre-pressing time is 10 s, the pressure release and exhaust time is 5 s, and the number of pressure release and exhaust is 5 times. The compression pressure is 10MPa, and the compression time is 10min to obtain the prefabricated part;

S23. Post-curing treatment: After the preform is dried, place it in an electric heating constant temperature blast drying oven, heat it at 160° C. for 10 hours, and then perform curing treatment to obtain a low-noise friction material.

The preparation method of the modified gel vermiculite used above is the same as in Example 1.

Example 3

A method for preparing a low-noise friction material, comprising the following steps:

S21. Ingredients: Weigh each component in proportion, including 14 parts of cashew shell oil modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whisker, 5 parts of glass fiber, and 7 parts of modified gel vermiculite parts, 3 parts of rubber powder, 25 parts of graphite, 10 parts of aluminum oxide, and 29 parts of barium sulfate. The mixer is used for stirring and mixing, so that various materials are fully dispersed and mixed evenly;

S22. Hot press molding: Put the mixture in step S21 into a four-column hydraulic press for hot press molding. The molding temperature is 160° C., the pre-pressing time is 10 s, the pressure release and exhaust time is 5 s, and the number of pressure release and exhaust is 5 times. The compression pressure is 10MPa, and the compression time is 10min to obtain the prefabricated part;

S23. Post-curing treatment: After the preform is dried, place it in an electric heating constant temperature blast drying oven, heat it at 160° C. for 10 hours, and then perform curing treatment to obtain a low-noise friction material.

The preparation method of the modified gel vermiculite used above is the same as in Example 1.

Comparative example 1

Comparative Example 1 is basically the same as Example 1, the difference is that the modified gel vermiculite in Example 1 is replaced by common vermiculite, common vermiculite is purchased from Hebei Bonnet, article number F-11, and the rest of the operations are the same Example 1.

Comparative example 2

Comparative Example 2 is basically the same as Example 1, and the difference is that the petroleum coke particles in the modified gel vermiculite in Example 1 are replaced by carbon fibers (purchased from Hebei Bonet, article number F-11), and obtained Modified gel vermiculite blended with carbon fiber and gel vermiculite, all the other operations are the same as in Example 1.

Low noise friction material performance test

The friction materials prepared in Examples 1-3 and Comparative Example 1-2 were tested for friction properties at different temperatures on a constant-speed friction testing machine. Wear performance, the results are shown in Table 4. Further, the noise test of the friction material was carried out by the scale-down bench friction testing machine method, and the noise floor was set to 72dB. The results are shown in Table 5.

Table 3 Comparative test results of friction properties of friction materials prepared in Examples 1-3 and Comparative Examples 1-2

Table 4 Comparative test results of wear properties of friction materials prepared in Examples 1-3 and Comparative Examples 1-2

Table 5 Comparative test results of friction properties of friction materials prepared in Examples 1-3 and Comparative Examples 1-2

It can be seen from Table 3-5 that the friction material obtained in Example 1-3 compared with the friction material obtained by using ordinary vermiculite or modified gel vermiculite in Example 1-2 at a high temperature The coefficient is more stable, the wear rate is significantly reduced, and the noise reduction performance is more excellent. Moreover, by adjusting the content of the modified gel vermiculite, it is found that 6 parts, 5 parts and 7 parts of modified vermiculite were added in Examples 1-3. When vermiculite is gelled, the friction coefficient of the friction material prepared in Example 2 is the most stable, and the wear degree of each example is similar below 250°C, but Example 2 is better at the high temperature wear stage above 250°C, but they are all better than Comparative Examples 1-2. This shows that the addition of the modified gel vermiculite of the present invention effectively improves the noise of the friction material, and simultaneously reduces the wear of the friction material, improves its anti-wear performance at high temperatures and ensures a stable friction coefficient at high temperatures. This will facilitate its application in the field of brake pads and/or brake pads, and improve the performance of brake pads and/or brake pads.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The low-noise friction material is characterized by comprising the following components in parts by mass: 5-20 parts of modified phenolic resin, 2-10 parts of aramid fiber, 1-4 parts of potassium titanate whisker, 5-15 parts of glass fiber, 3-15 parts of modified gel vermiculite, 3-7 parts of rubber powder, 15-30 parts of graphite, 2-10 parts of alumina and 20-40 parts of barium sulfate;

wherein the modified gel vermiculite is prepared by mixing gel vermiculite with petroleum coke particles.

2. The low noise friction material according to claim 1, comprising the following components in parts by mass: 14 parts of modified phenolic resin, 5 parts of aramid fiber, 2 parts of potassium titanate whisker, 5 parts of glass fiber, 6 parts of modified gel vermiculite, 3 parts of rubber powder, 25 parts of graphite, 10 parts of alumina and 30 parts of barium sulfate.

3. The low noise friction material of claim 1, wherein the modified phenolic resin is cashew nut shell oil modified phenolic resin.

4. A low noise friction material according to any of claims 1 to 3, wherein the modified vermiculite is prepared by a process comprising:

s11, mixing water glass and flaky vermiculite according to a mass ratio of 7:4, uniformly mixing;

s12, dropwise adding alkali which accounts for 1-2% of the mass of the mixture into the mixture obtained in the step S11 until gel is generated, standing the gel for aging, and then drying to obtain gel vermiculite;

s13, mixing the gel vermiculite with petroleum coke particles according to a mass ratio of 7:3, and uniformly mixing to obtain the modified gel vermiculite.

5. The low noise friction material of claim 4, wherein the modified vermiculite gel has a density of 0.08 to 0.2g/cm ³ The melting point is 1379-1400 deg.C, and the thermal conductivity is 0.04-0.06kcal/m ² h℃。

6. The low noise friction material of claim 4, wherein the particle diameter of the modified vermiculite gel is 0.8mm.

7. A method for producing a low-noise friction material, for producing the low-noise friction material according to any one of claims 1 to 6, comprising the steps of:

s21, preparing materials: weighing the components in proportion, premixing the modified gel vermiculite and the aramid fiber, adding other components, and uniformly mixing;

s22, hot-press forming: hot-press molding the mixture obtained in the step S21 to obtain a prefabricated member;

s23, post-curing treatment: and drying the prefabricated member, and then carrying out post-curing treatment to obtain the low-noise friction material.

8. The method for preparing a low-noise friction material according to claim 7, wherein the hot press molding operation comprises, in step S22: the forming temperature is 160 ℃, the pre-pressing time is 10s, the pressure and exhaust time is 5s, the pressure and exhaust times are 5 times, the hot-pressing pressure is 10MPa, and the pressing time is 10min.

9. The method for preparing a low noise friction material according to claim 7, wherein in step S23, the post-curing treatment operation includes: placing at 160 ℃ and preserving heat for 10h.

10. Use of a low noise friction material according to any of claims 1 to 6 in the manufacture of a brake pad or pad.