CN116120705A - Brake pad friction material and preparation method and application thereof - Google Patents

Brake pad friction material and preparation method and application thereof Download PDF

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Publication number
CN116120705A
CN116120705A CN202211707832.8A CN202211707832A CN116120705A CN 116120705 A CN116120705 A CN 116120705A CN 202211707832 A CN202211707832 A CN 202211707832A CN 116120705 A CN116120705 A CN 116120705A
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Prior art keywords
friction material
brake pad
aramid pulp
friction
resin
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Inventor
马德文
吕娜
于晓
李春霞
苗拯宁
邓钧波
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Ningxia Taihexing Material Technology Co ltd
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Ningxia Taihexing Material Technology Co ltd
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Priority to CN202211707832.8A priority Critical patent/CN116120705A/en
Publication of CN116120705A publication Critical patent/CN116120705A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/027—Compositions based on metals or inorganic oxides
    • F16D69/028—Compositions based on metals or inorganic oxides containing fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C08L61/14—Modified phenol-aldehyde condensates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/045—Bonding
    • F16D2069/0466—Bonding chemical, e.g. using adhesives, vulcanising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/006—Materials; Production methods therefor containing fibres or particles
    • F16D2200/0065—Inorganic, e.g. non-asbestos mineral fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/0082—Production methods therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/0082—Production methods therefor
    • F16D2200/0086—Moulding materials together by application of heat and pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0023—Shaping by pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0061—Joining
    • F16D2250/0069—Adhesive bonding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a brake pad friction material, a preparation method and application thereof, wherein the brake pad friction material comprises the following components in percentage by mass: resin adhesive: 6% -12%; grinding agent: 2% -8%; inorganic reinforcing fibers: 16% -30%; and (3) a lubricant: 10% -20%; filling material: 20% -35%; aramid pulp fiber: 1.5% -4.5%; poly (paraphenylene terephthalamide) particles: 4% -8%. The friction material for the automobile brake pad provided by the invention can effectively overcome the phenomena of abnormal wear, unstable coefficient, friction material cracks and the like, and meanwhile, the heat conductivity of the prepared friction material is increased by increasing the heat conductivity of aramid pulp fibers, so that the aggregation of heat energy of the friction material in the braking process can be reduced, and the friction surface temperature is lowered.

Description

Brake pad friction material and preparation method and application thereof
Technical Field
The invention relates to the technical field of automobile brake pads, in particular to a brake pad friction material and a preparation method and application thereof.
Background
At present, the adhesive resin in the automobile brake pad is in powder particles, and is uniformly mixed with other materials in the mixing process, but in the conveying or feeding process, the resin or other powder particles can cause layering due to the difference of the sizes and the densities of the resin or other powder particles, meanwhile, the layering phenomenon can occur when the particle materials and the fiber materials are the same, the friction materials are formed by mainly bonding all the materials together through the resin, the layering of the adhesive can lead to uneven bonding of the friction materials in the forming process, and meanwhile, the powder particles such as abrasive materials, fillers and the like can also be layered or aggregated, so that the materials are uneven. High temperature is generated in the working process of the friction material, abrasion is large due to material delamination and adhesion, and the coefficient is changed.
On the other hand, in the braking process of an automobile, the contact surface of the friction material and the disc can generate high temperature of more than 400 ℃, particularly, the material with a ceramic formula can generate high temperature due to slow heat conduction and aggregation of the temperature, and certain substances in the material can be decomposed at the moment, so that abrasion and coefficient change are caused. In addition, hard particles can increase the coefficient of friction materials during braking of automobiles, but friction between the hard particles and a brake disc can generate noise, and driving comfort is reduced, so that a material capable of resisting high temperature, providing the friction coefficient and absorbing noise is needed to improve the problem.
Disclosure of Invention
The invention provides a brake pad friction material, a preparation method and application thereof, which can effectively overcome the problems of abnormal wear, unstable friction coefficient and the like.
The invention provides a friction material of a brake pad, which comprises the following components in percentage by mass: resin adhesive: 6% -12%; grinding agent: 2% -8%; inorganic reinforcing fibers: 16% -30%; and (3) a lubricant: 10% -20%; filling material: 20% -35%; aramid pulp fiber: 1.5% -4.5%; poly (paraphenylene terephthalamide) particles: 4% -8%.
Preferably, the resin binder is in a liquid state.
Preferably, the resin binder is an acrylic modified phenolic resin or a nitrile rubber modified phenolic resin.
In the friction material of the front brake pad, the resin adhesive is acrylic acid modified phenolic resin; in the friction material of the rear brake pad, the resin adhesive is nitrile rubber modified phenolic resin. In the working process of the friction material, the front brake pad mainly bears the braking effect and has higher temperature, so that the high-temperature-resistant acrylic acid modified phenolic resin is adopted; in the friction material of the rear brake pad, the resin adhesive adopts nitrile rubber modified phenolic resin, so that noise can be reduced, and driving comfort can be improved.
As a preferable scheme, the aramid pulp fiber adopts coarse denier fiber, and the monofilament linear density is 4.0-4.4detx.
As a preferable scheme, hexagonal boron nitride is added in the pulverizing process of the aramid pulp fiber, so that the heat conductivity of the aramid pulp fiber can be increased, the heat conductivity of the prepared friction material is increased, the aggregation of heat energy of the friction material in the braking process can be reduced, and the friction surface temperature is reduced.
As a preferable scheme, the adding proportion of the hexagonal boron nitride is 0.5-1.0% of the aramid pulp fiber according to the weight percentage, so that the hexagonal boron nitride can be adsorbed on the surface of the aramid pulp.
The invention also provides a preparation method of the brake pad friction material according to any scheme, which comprises the following steps of mixing resin adhesive, grinding aid, inorganic reinforcing fiber, lubricant, filling material, aramid pulp fiber and poly-p-phenylene terephthamide particles to obtain a mixed material, compression molding the mixed material, and curing to obtain a friction material finished product.
Preferably, the mixing process comprises the following steps:
s101: mixing aramid pulp fibers, inorganic reinforcing fibers and filling materials, and carrying out opening treatment to obtain a mixed material A;
s102: adding a grinding aid, a lubricant and poly-p-phenylene terephthamide particles into the mixed material A, and continuously mixing to obtain a mixed material B;
s103: and atomizing the resin adhesive, and then adding the atomized resin adhesive into the mixed material B to further mix the materials to obtain a mixed material.
The invention also provides application of the friction material in the field of automobile braking.
Compared with the prior art, the invention has the beneficial effects that:
1) The friction material for the automobile brake pad provided by the invention can be effectively adsorbed with other materials by adopting a liquid resin adhesive and mixing with the other materials in an atomizing spraying mode, and can also lock other granular materials, so that layering caused by vibration and feeding is prevented, the uniformity of the friction material is ensured, and the phenomena of abnormal abrasion, unstable coefficient, friction material crack and the like caused by the decomposition or non-uniformity of the resin adhesive at high temperature can be effectively overcome.
2) The invention adopts the thick denier aramid pulp fiber, so that the thick denier aramid pulp fiber is easier to fibrillate, the specific surface area of the prepared pulp is increased, a larger space can be provided for being adsorbed by friction materials, and aggregation of particles is reduced; on the other hand, the main part remains more tend to be complete, the strength of the main part is increased, the cohesive force of the material can be increased, and the overall strength of the friction material is improved, so that the abrasion of the friction material is reduced, and the shearing strength is increased. And by adding a small amount of hexagonal boron nitride in the process of crushing the aramid pulp fibers, the heat conductivity of the aramid pulp fibers can be increased, the heat conductivity of the prepared friction material is increased, the aggregation of heat energy of the friction material in the braking process can be reduced, and the friction surface temperature is reduced.
3) The addition of poly (paraphenylene terephthalamide) particles in the friction material has the effects of stabilizing friction coefficient, reducing noise, reducing abrasion, and the like.
Drawings
FIG. 1 is a graph showing the comparison of friction coefficients of the first embodiment of the present invention and the first comparative example;
FIG. 2 is a graph comparing wear data of the first example and the first comparative example of the present invention.
Detailed Description
Other advantages and advantages of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only a part, but not all, of the practice of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a friction material of an automobile brake pad, which comprises the following components in percentage by mass: resin adhesive: 6% -12%; grinding agent: 2% -8%; inorganic reinforcing fibers: 16% -30%; and (3) a lubricant: 10% -20%; filling material: 20% -35%; aramid pulp fiber: 1.5% -4.5%; poly (paraphenylene terephthalamide) particles: 4% -8%.
The resin adhesive adopts acrylic acid modified phenolic resin or nitrile rubber modified phenolic resin. In the braking process, the surface temperature of the friction material is up to more than 400 ℃, the decomposition temperature of the resin adhesive is generally about 300-350 ℃, at this time, part of the resin is decomposed to lose the bonding effect, if the friction material is layered in transportation or other conditions, the distribution of the resin adhesive in the friction material is uneven, so that the bonding force of a part of the area is reduced, in this case, part of the material falls off due to the fact that the adhesive is not firmly bonded, abnormal abrasion occurs, and meanwhile, the phenomena of unstable coefficient, cracks of the friction material and the like are accompanied. Based on the above situation, it is preferable to set that, in the friction material of the front brake pad, the resin adhesive is acrylic acid modified phenolic resin, and the friction material mainly bears braking effect in the working process, and the temperature is higher, so that the high temperature resistant (the heat resistant temperature reaches 350-400 ℃) acrylic acid modified phenolic resin is adopted; in the friction material of the rear brake pad, the resin adhesive adopts nitrile rubber modified phenolic resin, so that noise can be reduced, and driving comfort can be improved.
Furthermore, the resin adhesive is in a liquid state, and in the mixing process, the liquid resin adhesive is atomized and sprayed into a mixer to be mixed with other materials, so that the resin adhesive can be effectively adsorbed with other materials, and other granular materials can be locked at the same time, so that layering caused by vibration and feeding is prevented, the uniformity of the friction material is ensured, and the phenomena of abnormal abrasion, unstable coefficient, friction material cracks and the like caused by decomposition or non-uniformity of the resin adhesive at high temperature can be effectively overcome.
More specifically, in the invention, zirconium silicate and/or magnesium oxide, preferably a mixture of the zirconium silicate and the magnesium oxide, are adopted as the grinding aid, wherein the zirconium silicate and the magnesium oxide respectively account for 1-4% by mass percent.
The inorganic reinforcing fiber adopts any one of copper fiber, ceramic fiber and potassium titanate or a mixture of a plurality of materials, preferably adopts the mixture of the three materials, and comprises 8 to 11 mass percent of copper fiber, 2 to 4 mass percent of ceramic fiber and 6 to 15 mass percent of potassium titanate.
The lubricant adopts flake graphite, mica and antimony metal oxide.
The filling material adopts wollastonite, vermiculite, calcium hydroxide and barium sulfate.
The poly (p-phenylene terephthalamide) fiber is aramid fiber, wherein the aramid pulp fiber is adopted, and the coarse denier fiber is adopted, so that the linear density of monofilaments is 4.0-4.4detx, preferably 4.4detx, and the tensile strength is more than 16cN/Dtex. The coarse denier aramid pulp fiber defined by the invention is easier to fibrillate, the specific surface area of the prepared pulp is increased, a larger space can be provided for being adsorbed by friction materials, and aggregation of particles is reduced; and the trunk remains more complete, the strength of the friction material is increased, the cohesive force of the friction material can be increased, and the integral strength of the friction material is improved, so that the abrasion of the friction material is reduced, and the shearing strength is increased. On the other hand, the aramid pulp fiber is a heat-conducting fiber, and a small amount of hexagonal boron nitride is added in the pulverizing process of the aramid pulp fiber, so that the heat conductivity of the aramid pulp fiber can be increased, the heat-conducting property of the prepared friction material is increased, the aggregation of heat energy of the friction material in the braking process can be reduced, and the friction surface temperature is lowered. According to the weight percentage, the adding proportion of the hexagonal boron nitride is preferably between 0.5 and 1.0 percent of the aramid pulp fiber, so that the hexagonal boron nitride can be adsorbed on the surface of the aramid pulp.
The poly-p-phenylene terephthalamide particles adopted in the invention are functional materials, the macroscopic state is yellow small particles, the microscopic state is spherical, the particle size is 20-80um, and part of pores of friction materials can be filled. The material has the characteristics of noise absorption, wear resistance and high temperature resistance, and the addition of the poly-paraphenylene terephthalamide particles in the friction material has the following effects:
1) Stable coefficient of friction
The high temperature can be generated in the braking process, the organic filling material in the friction material can be decomposed to generate gases, and the gases volatilize on the surfaces of the disc and the sheet, so that the contact state of the disc during braking can be influenced, the friction coefficient change occurs at high temperature, the friction coefficient is reduced or unstable, the poly-p-phenylene terephthalamide particles have the characteristic of high temperature resistance, and can not be decomposed under the same condition, and a certain friction coefficient can be provided, so that the friction coefficient change is reduced.
2) Noise reduction
The poly-p-phenylene terephthamide particles have the characteristic of noise absorption, and meanwhile, the poly-p-phenylene terephthamide particles have a certain abrasive characteristic, so that the use amount of hard particles in the friction material can be reduced, and the noise generation is solved from the source of the friction material.
3) Abrasion wear
The poly-p-phenylene terephthamide particles are wear-resistant materials, can reduce wear during braking, have good high temperature resistance, do not decompose at high temperature, and reduce wear change caused by organic decomposition, thereby reducing wear.
The friction material of the automobile brake pad provided by the invention can be effectively adsorbed with other materials by adopting a liquid resin adhesive and mixing with the other materials in an atomizing spraying mode, and can also lock other granular materials, so that layering caused by vibration and feeding is prevented, the uniformity of the friction material is ensured, and the phenomena of abnormal abrasion, unstable coefficient, friction material crack and the like caused by the decomposition or non-uniformity of the resin adhesive at high temperature can be effectively overcome. And the resin adhesive adopts high-temperature-resistant acrylic modified resin, so that the phenomenon that partial materials fall off due to the fact that the resin adhesive is decomposed and loses bonding effect at high temperature can be effectively improved, and the phenomena of abnormal abrasion, friction material cracks and the like are further improved.
Further, the coarse denier aramid pulp fibers are adopted, so that fibrillation is easier, the specific surface area of the prepared pulp is increased, a larger space can be provided for being adsorbed by friction materials, and aggregation of particles is reduced; on the other hand, the main part remains more tend to be complete, the strength of the main part is increased, the cohesive force of the material can be increased, and the overall strength of the friction material is improved, so that the abrasion of the friction material is reduced, and the shearing strength is increased. And by adding a small amount of hexagonal boron nitride in the process of crushing the aramid pulp fibers, the heat conductivity of the aramid pulp fibers can be increased, the heat conductivity of the prepared friction material is increased, the aggregation of heat energy of the friction material in the braking process can be reduced, and the friction surface temperature is reduced.
The poly-p-phenylene terephthamide particles have the characteristics of noise absorption, wear resistance and high temperature resistance, and the addition of the poly-p-phenylene terephthamide particles in the friction material has the effects of stabilizing the friction coefficient, reducing the noise, reducing the wear and the like.
The invention also provides a preparation method of the friction material based on the automobile brake pad, which comprises the following steps:
s1, mixing materials
S101: putting aramid pulp fibers, inorganic reinforcing fibers and filling materials into a mixer for opening treatment, wherein the mixing time is 5min, so as to obtain a mixed material A;
s102: adding a grinding aid, a lubricant and poly-paraphenylene terephthalamide particles into the mixed material A, and continuously mixing for 5min to obtain a mixed material B;
s103: after atomizing the liquid resin adhesive, spraying and adding the atomized liquid resin adhesive into the mixed material B to further mix the materials, so as to obtain a mixed material, wherein the pressure used by the atomizing device is 0.5-0.7Mpa.
In the mixer, the rotation speed of the coulter is set to 1000r/min, and the rotation speed of the reamer is set to 2800r/min.
S2, cold pressing
Cold press molding the mixture in a cold press mold, wherein the pressure is set to 15Mpa, the procedure pressing time is set to 2s, the air release time is set to 1s, and the mixture is pressed for 2s again to be molded.
S3, hot pressing
And (3) placing the friction material subjected to cold press molding in a hot press mold, setting the procedure pressing time to be 10s, the air release time to be 5s, circulating for 5 times, and finally pressing and staying for 300s. The hot pressing temperature of the front piece is set to 165 ℃ and the pressure is 35Mpa; the temperature of the rear sheet was set at 150℃and the pressure at 25MPa.
S4, post-treatment
Placing the friction material subjected to hot pressing on an infrared ray assembly line, and carrying out final curing treatment on the resin; the friction material product after the hot pressing is required to be immediately placed on an infrared ray assembly line, wherein the infrared ray heating equipment comprises three heating plates, the temperature is set to be 250 ℃, the temperature is set to be 350 ℃, the temperature is set to be 450 ℃, the length of each heating plate is set to be 4.0m, the belt speed is set to be 1m/min, and the post-treatment time is set to be 12min. The infrared heating has penetrability, and compared with the traditional heat curing set at about 200 ℃, the infrared heating can carry out deeper preheating on the friction material, and can effectively prevent coefficient reduction of the friction material caused by high temperature during working.
S5, machining
And (3) carrying out mechanical processing treatment on the friction material subjected to the post-treatment to obtain a friction material finished product.
The technical solutions provided by the present invention will be described in detail below in conjunction with examples for further illustrating the present invention, but they should not be construed as limiting the scope of the present invention. The components and preparation of the friction material for the front brake pad will be described in each example.
Example 1
In this embodiment, the friction material comprises the following components in percentage by mass:
9% of a resin adhesive (acrylic modified phenolic resin);
in the grinding aid, zirconium silicate is 3% and magnesium oxide is 4%;
4.4detx macrodenier aramid pulp fiber 4% (hexagonal boron nitride added);
in the inorganic reinforced fiber, the potassium titanate fiber is 14 percent, the red copper fiber is 10 percent and the ceramic fiber is 2 percent;
in the lubricant, 4% of graphite, 8% of mica and 6% of antimony oxide;
in the filling material, barium sulfate is 25% and wollastonite is 5%;
6% of poly (paraphenylene terephthalamide) particles.
The preparation method comprises the following steps:
s1, mixing materials
S101: putting aramid pulp fibers, inorganic reinforcing fibers such as potassium titanate and the like, filling materials such as barium sulfate and the like into a mixer for opening treatment, wherein the mixing time is 5min, and obtaining a mixed material A;
s102: adding the rest material with the acrylic acid modified phenolic resin removed into the mixed material A, and continuously mixing for 5min to obtain a mixed material B;
s103: and atomizing the liquid resin adhesive, and then adding the atomized liquid resin adhesive into the mixed material B to further mix the materials, thereby obtaining a mixed material.
In the mixer, the rotation speed of the coulter is set to 1000r/min, and the rotation speed of the reamer is set to 2800r/min.
S2, cold pressing
Cold press molding the mixture in a cold press mold, wherein the pressure is set to 15Mpa, the procedure pressing time is set to 2s, the air release time is set to 1s, and the mixture is pressed for 2s again to be molded.
S3, hot pressing
The friction material formed by cold pressing is placed in a hot pressing mold, the temperature of the mold is set to 165 ℃, the pressure during pressing is set to 35Mpa, the procedure pressing time is set to 10s, the air release time is set to 5s, the cycle is carried out for 5 times, and finally the pressing residence time is set to 300s.
S4, post-treatment
Placing the friction material subjected to hot pressing on an infrared ray assembly line, and carrying out final curing treatment on the resin; the friction material product after the hot pressing is required to be immediately placed on an infrared ray production line, wherein the infrared ray heating is divided into three parts, the temperature is respectively set to 250 ℃, 350 ℃, 450 ℃, and the post-treatment time is 12 minutes.
S5, machining
And (3) carrying out mechanical processing treatment on the friction material subjected to the post-treatment to obtain a friction material finished product.
Example two
In this embodiment, the friction material comprises the following components in percentage by mass:
6% of a resin adhesive (acrylic modified phenolic resin);
in the grinding aid, zirconium silicate is 4% and magnesium oxide is 4%;
4.4detx 1.5% heavy denier aramid pulp fiber (hexagonal boron nitride added);
in the inorganic reinforced fiber, 15% of potassium titanate fiber, 10% of red copper fiber and 4% of ceramic fiber;
in the lubricant, 4.5% of graphite, 4% of mica and 4% of antimony oxide;
in the filling material, barium sulfate is 20% and wollastonite is 15%;
8% of poly (paraphenylene terephthalamide) particles.
In the second embodiment, the preparation method of the friction material is the same as that of the first embodiment, and a detailed description thereof is omitted.
Example III
In this embodiment, the friction material comprises the following components in percentage by mass:
12% of a resin adhesive (acrylic modified phenolic resin);
in the grinding aid, zirconium silicate is 2% and magnesium oxide is 3%;
4.4detx heavy denier aramid pulp fiber 4.5% (hexagonal boron nitride added);
in the inorganic reinforced fiber, 10% of potassium titanate fiber, 8% of red copper fiber and 2% of ceramic fiber;
in the lubricant, 7.5% of graphite, 7% of mica and 5% of antimony oxide;
in the filling material, barium sulfate is 20% and wollastonite is 15%;
4% of poly (paraphenylene terephthalamide) particles.
In the third embodiment, the preparation method of the friction material is the same as that of the first embodiment, and a detailed description thereof is omitted.
Comparative example one
This comparative example differs from example one in that 6% of the poly (paraphenylene terephthalamide) particles were replaced with 3% of tire powder and 3% of nitrile rubber powder, and the heat curing temperature was controlled at 200℃in the post-treatment step during the preparation.
Comparative example two
The present comparative example differs from example one in that the 4.4detx macro-denier aramid pulp fiber was replaced with a common aramid fiber without adding hexagonal boron nitride.
The brake pad friction materials prepared in example one, example two, example three, and two comparative examples were tested for performance as follows:
1. thermal conduction
First, a comparison of heat conduction data is made, and table 1 shows the heat conduction data of each example and comparative example:
table 1 comparison of heat transfer data
Examples Example 1 Example two Example III Comparative example one Comparative example two
Temperature (. Degree. C.) 196 189 193 184 167
According to the data, the heat conduction of the friction material is greatly improved by adopting the modified aramid fiber in the three embodiments and the first comparative example, so that heat can be effectively transferred, and the energy is prevented from accumulating to generate a high-temperature working state.
2. Coefficient of friction
Next, friction coefficient comparison is performed, and table 2 shows friction coefficient comparison data of each example and comparative example:
table 2 coefficient of friction comparison
Examples Example 1 Example two Example III Comparative example one Comparative example two
Coefficient of friction 0.43 0.45 0.43 0.39 0.41
As can be seen from the table, the coefficient of friction in the examples is significantly higher than that of the comparative examples, especially the comparative example-no added poly (paraphenylene terephthalamide) particles are at a low point, indicating that the poly (paraphenylene terephthalamide) particles can provide a coefficient of friction. In addition, the coefficient of friction of the second comparative example was slightly lower than that of the example, indicating that the unmodified aramid had a certain effect on the coefficient of friction.
The individual comparison data for example one and comparative example one are shown in fig. 1. According to fig. 1, the difference between the heat deterioration and the twice deterioration of the first embodiment is also superior to that of the first comparative embodiment, which indicates that the high temperature causes the decomposition of the organic particles in the comparative embodiment during the braking process, thereby affecting the coefficient change, and also indicates that the high temperature during the infrared heat treatment can simulate the high temperature during the braking process, so that the coefficient becomes more stable after the brake pad is subjected to the high temperature.
3. Wear comparison
The abrasion comparison data of example one and comparative example one are shown in fig. 2, and it can be seen from the graph that the difference between the two is not large at low temperature and low speed, but at high temperature, example one is superior to comparative example one in terms of weight loss per unit thickness, and the decomposed substance in comparative example one is significantly higher than that in example one.
From the above analysis, it can be seen from the detection results of the first, second, third and comparative examples that the heat conductivity, friction coefficient and wear performance of the brake pad friction material provided in each example of the present invention are improved compared with those of the comparative example.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed. The embodiments of the present invention described above do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention as set forth in the appended claims.

Claims (10)

1. The friction material for the brake pad is characterized by comprising the following components in percentage by mass:
resin adhesive: 6% -12%;
grinding agent: 2% -8%;
inorganic reinforcing fibers: 16% -30%;
and (3) a lubricant: 10% -20%;
filling material: 20% -35%;
aramid pulp fiber: 1.5% -4.5%;
poly (paraphenylene terephthalamide) particles: 4% -8%.
2. A brake pad friction material according to claim 1 wherein said resin binder is in a liquid state.
3. The brake pad friction material of claim 1 wherein the resin binder is an acrylic modified phenolic resin or a nitrile rubber modified phenolic resin.
4. The brake pad friction material of claim 1, wherein in the front brake pad friction material, the resin binder is an acrylic modified phenolic resin; in the friction material of the rear brake pad, the resin adhesive is nitrile rubber modified phenolic resin.
5. The brake pad friction material of claim 1 wherein said aramid pulp fibers are macro denier fibers having a filament linear density of 4.0 to 4.4detx.
6. The brake pad friction material of claim 1 wherein the aramid pulp fibers are added with hexagonal boron nitride during comminution.
7. The brake pad friction material according to claim 6, wherein the hexagonal boron nitride is added in an amount of 0.5 to 1.0% by weight of the aramid pulp fiber.
8. The method for preparing the friction material of the brake pad according to any one of claims 1 to 7, which is characterized by comprising the steps of mixing resin adhesive, grinding aid, inorganic reinforcing fiber, lubricant, filling material, aramid pulp fiber and poly (p-phenylene terephthamide) particles to obtain a mixed material, compression molding the mixed material, and curing to obtain a friction material finished product.
9. The method of preparing according to claim 8, wherein the process of mixing comprises the steps of:
s101: mixing aramid pulp fibers, inorganic reinforcing fibers and filling materials, and carrying out opening treatment to obtain a mixed material A;
s102: adding a grinding aid, a lubricant and poly-p-phenylene terephthamide particles into the mixed material A, and continuously mixing to obtain a mixed material B;
s103: and atomizing the resin adhesive, and then adding the atomized resin adhesive into the mixed material B to further mix the materials to obtain a mixed material.
10. Use of a friction material as claimed in any one of claims 1 to 7 in the field of automotive braking.
CN202211707832.8A 2022-12-29 2022-12-29 Brake pad friction material and preparation method and application thereof Pending CN116120705A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211707832.8A CN116120705A (en) 2022-12-29 2022-12-29 Brake pad friction material and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211707832.8A CN116120705A (en) 2022-12-29 2022-12-29 Brake pad friction material and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN116120705A true CN116120705A (en) 2023-05-16

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