CN116239334A - Disk brake pad friction material and production process thereof - Google Patents
Disk brake pad friction material and production process thereof Download PDFInfo
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- CN116239334A CN116239334A CN202310254427.3A CN202310254427A CN116239334A CN 116239334 A CN116239334 A CN 116239334A CN 202310254427 A CN202310254427 A CN 202310254427A CN 116239334 A CN116239334 A CN 116239334A
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- Prior art keywords
- parts
- aramid pulp
- friction material
- brake pad
- deionized water
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- 239000002783 friction material Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000004760 aramid Substances 0.000 claims abstract description 55
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 55
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 21
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 12
- 239000010431 corundum Substances 0.000 claims abstract description 12
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 12
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 10
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052599 brucite Inorganic materials 0.000 claims abstract description 10
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 10
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010457 zeolite Substances 0.000 claims abstract description 10
- 239000010455 vermiculite Substances 0.000 claims abstract description 8
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 8
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 108
- 239000008367 deionised water Substances 0.000 claims description 45
- 229910021641 deionized water Inorganic materials 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 44
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 30
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 30
- PLIKAWJENQZMHA-UHFFFAOYSA-N 4-aminophenol Chemical compound NC1=CC=C(O)C=C1 PLIKAWJENQZMHA-UHFFFAOYSA-N 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 20
- 239000000706 filtrate Substances 0.000 claims description 20
- 239000000178 monomer Substances 0.000 claims description 17
- YLJJAVFOBDSYAN-UHFFFAOYSA-N dichloro-ethenyl-methylsilane Chemical compound C[Si](Cl)(Cl)C=C YLJJAVFOBDSYAN-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 229910020649 KH560 Inorganic materials 0.000 claims description 11
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 11
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 125000003277 amino group Chemical group 0.000 claims description 7
- 125000003700 epoxy group Chemical group 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 229910002808 Si–O–Si Inorganic materials 0.000 abstract description 2
- 239000011258 core-shell material Substances 0.000 abstract 1
- 239000002159 nanocrystal Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001568 phenolic resin Polymers 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 241000545744 Hirudinea Species 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000008098 formaldehyde solution Substances 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 239000012783 reinforcing fiber Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007046 ethoxylation reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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—Compositions of linings; Methods of manufacturing
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/12—Condensation polymers of aldehydes or ketones
- C04B26/122—Phenol-formaldehyde condensation polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/24—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with mixtures of two or more phenols which are not covered by only one of the groups C08G8/10 - C08G8/20
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00362—Friction materials, e.g. used as brake linings, anti-skid materials
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention discloses a friction material of a disc brake pad and a production process thereof, wherein the friction material is prepared from the following raw materials in parts by weight: 8-12 parts of modified phenolic resin, 2-5 parts of modified aramid pulp, 30-40 parts of aluminum silicate ceramic fiber, 3-5 parts of expanded vermiculite, 2-4 parts of talcum powder, 1-3 parts of zircon powder, 1-3 parts of corundum powder, 2-4 parts of brucite, 1-3 parts of zeolite, 5-7 parts of graphite, 13-15 parts of barium sulfate and 12-18 parts of chopped copper fiber; the modified phenolic resin is a core-shell structure, so that the toughness of the prepared friction material is improved, meanwhile, the cage-shaped Si-O-Si structure in the molecular structure further improves the heat resistance of the modified phenolic resin, unstable friction coefficient caused by overhigh temperature of a brake pad in a braking process is avoided, and the porous nano crystal grains on the modified aramid pulp are matched with the expanded vermiculite, zircon powder and corundum powder, so that braking noise can be well reduced, and the friction coefficient is improved.
Description
Technical Field
The invention relates to the technical field of brake pad preparation, in particular to a disc brake pad friction material and a production process thereof.
Background
The brake pad for automobile and engineering machinery is one kind of friction material and has the main function of absorbing kinetic energy via friction with metal pair to make the automobile work safely and reliably. Its main function is to slow down or stop the vehicle by rubbing against the dual disks to absorb kinetic energy. Because the area of the disc brake pad is smaller and the bearing braking load is higher, the performance requirement is higher, the adhesive has good infiltration performance on the components such as reinforcing fiber, filler and the like, and the materials are bonded together to form stable chemical bonds with the materials, so that the disc brake pad is a matrix of the brake pad. The adhesive is phenolic resin (modified resin) and synthetic rubber powder, the phenolic resin is used as main material, and under a certain heating temperature, the phenolic resin is softened and then enters into a viscous state to flow, and the phenolic resin is uniformly distributed in the ceramic-based brake pad forming material, and then the reinforcing fiber and the filler are bonded together through resin curing and vulcanization, so that a product which is compact in texture, has certain mechanical strength and can meet the friction performance requirement of the brake pad is formed.
Disclosure of Invention
The invention aims to provide a friction material of a disc brake pad and a production process thereof, which solve the problem that the friction coefficient of the friction material is unstable in a high-temperature environment generated by long-time braking at the present stage.
The aim of the invention can be achieved by the following technical scheme:
a friction material of a disc brake pad and a production process thereof specifically comprise the following steps:
step S1: weighing the following raw materials in parts by weight: 8-12 parts of modified phenolic resin, 2-5 parts of modified aramid pulp, 30-40 parts of aluminum silicate ceramic fiber, 3-5 parts of expanded vermiculite, 2-4 parts of talcum powder, 1-3 parts of zircon powder, 1-3 parts of corundum powder, 2-4 parts of brucite, 1-3 parts of zeolite, 5-7 parts of graphite, 13-15 parts of barium sulfate and 12-18 parts of chopped copper fiber;
step S2: after the raw materials are uniformly mixed, the mixture is added into a die, the pressure is 13-15MPa, the temperature is 160-170 ℃, the temperature is maintained for 15s, the temperature is raised to 190-195 ℃, the ultraviolet irradiation is carried out for 10-15min, and the heat preservation treatment is carried out for 8-10h, thus obtaining the friction material for the disc brake pad.
Further, the modified phenolic resin is prepared by the following steps:
step A1: uniformly mixing KH560, sodium hydroxide and deionized water, reacting for 3-5 hours at the rotating speed of 200-300r/min and the temperature of 80-85 ℃, cooling to 20-25 ℃, continuing to react for 70-75 hours, filtering to remove filtrate, dissolving a substrate in toluene, adding triethylamine, stirring and dropwise adding methylvinyldichlorosilane at the rotating speed of 150-200r/min and the temperature of 20-25 ℃, reacting for 3-4 hours, filtering to remove filtrate, and drying the substrate to obtain an intermediate 1;
step A2: uniformly mixing the intermediate 1, p-aminophenol and toluene, reacting for 3-5 hours at the rotating speed of 150-200r/min and the temperature of 20-25 ℃ under the condition that the pH value is alkaline to obtain a modified monomer, uniformly mixing the modified monomer, phenol, sodium hydroxide solution and formaldehyde aqueous solution, reacting for 2-3 hours at the rotating speed of 200-300r/min and the temperature of 60-70 ℃, heating to 95-98 ℃, continuing to react for 1-1.5 hours, and distilling and dehydrating to obtain the modified phenolic resin.
Further, the dosage ratio of KH560, sodium hydroxide and deionized water in the step A1 is 8mmol:4mmol:15mL, the molar ratio of the substrate to the methylvinyldichlorosilane is 1:2, and the dosage of triethylamine is 1-3% of the mass of the substrate and the methylvinyldichlorosilane.
Further, the molar ratio of epoxy groups on the intermediate 1 to amino groups on the para-aminophenol in the step A2 is 1:1, the mass ratio of the modified monomer, phenol, sodium hydroxide solution and aqueous formaldehyde solution is 95:7.6:2:121, the mass fraction of the sodium hydroxide solution is 50%, and the mass fraction of the aqueous formaldehyde solution is 37%.
Further, the modified aramid pulp is prepared by the following steps:
step B1: soaking aramid pulp in acetone, performing ultrasonic treatment for 3-5 hours at the power of 100-120W and the temperature of 25-30 ℃, drying, dispersing in ethanol, stirring and adding deionized water, ammonia water and ethyl orthosilicate at the rotating speed of 150-200r/min and the temperature of 30-40 ℃ for reacting for 2-3 hours, filtering to remove filtrate, washing a substrate with deionized water until the solution is clear, and drying to obtain pretreated aramid pulp;
step B2: dispersing the pretreated aramid pulp in deionized water, adding sodium hydroxide, stirring for 20-25 hours at the rotating speed of 200-300r/min and the temperature of 30-40 ℃, filtering to remove filtrate, washing a substrate with deionized water until the washing liquid is neutral, dispersing in the deionized water, adding 3-mercaptopropyl triethoxysilane, reacting for 3-5 hours at the rotating speed of 150-200r/min and the temperature of 50-60 ℃, filtering and drying to obtain the modified aramid pulp.
Further, the mass ratio of the aramid pulp, the ethanol, the deionized water, the ammonia water and the tetraethoxysilane in the step B1 is 3.2:150:16:2.7:3.85.
Further, the mass ratio of the pretreated aramid pulp to the deionized water to the sodium hydroxide in the step B2 is 3:100:0.65, and the dosage of the 3-mercaptopropyl triethoxysilane is 3-5% of the mass of the pretreated aramid pulp.
The friction material for the disc brake pad, which is prepared by the invention, is prepared from the following raw materials: modified phenolic resin, modified aramid pulp, aluminum silicate ceramic fiber, expanded vermiculite, talcum powder, zircon powder, corundum powder, brucite, zeolite, graphite, barium sulfate and chopped copper fiber, modified phenolic resin takes KH560 as raw material and hydrolyzes and condenses, octaepoxysilanol sodium salt is formed, and then the octaepoxysilanol sodium salt is subjected to hydrolytic condensation end capping with methyl vinyl dichlorosilane, intermediate 1 is prepared, intermediate 1 and para-aminophenol react under alkaline condition, epoxy groups on intermediate 1 react with amino groups on para-aminophenol, modified monomer is prepared, modified monomer, phenol and formaldehyde are condensed under the action of sodium hydroxide, modified phenolic resin is prepared, modified phenolic resin is taken as nuclear shell structure, toughness of the prepared friction material is improved, cage Si-O-Si structure in the molecular structure enables heat resistance of the modified phenolic resin to be further improved, friction coefficient instability caused by overhigh temperature of a brake pad in a braking process is avoided, and chopped copper fiber has good heat conducting effect, heat generated by friction is rapidly dissipated, the modified aramid pulp is prepared into aramid pulp, epoxy groups on the aramid pulp is firstly reacted with amino groups on the para-aminophenol, the surface of the aramid pulp is removed, the surface of the aramid pulp is subjected to mechanical treatment of the surface treatment of the porous silica pulp, the surface is subjected to the surface treatment of the porous silica pulp is subjected to 3-ethoxylation, the surface is subjected to the mechanical treatment of the modified alumina pulp, the surface is subjected to the mechanical treatment is subjected to the surface treatment of the porous silica pulp is subjected to the porous silica, the porous alumina pulp is subjected to the porous silica, the heat is further has the heat, and the heat is further has high heat resistance, and the heat is further has high, the cooperation of zircon powder and corundum powder can well reduce braking noise and improve friction coefficient.
Description of the embodiments
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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 embodiment 1 is a production process of a friction material of a disc brake pad, and specifically comprises the following steps:
step S1: weighing the following raw materials in parts by weight: 8 parts of modified phenolic resin, 2 parts of modified aramid pulp, 30 parts of aluminum silicate ceramic fiber, 3 parts of expanded vermiculite, 2 parts of talcum powder, 1 part of zircon powder, 1 part of corundum powder, 2 parts of brucite, 1 part of zeolite, 5 parts of graphite, 13 parts of barium sulfate and 12 parts of chopped copper fiber;
step S2: after the raw materials are uniformly mixed, the mixture is added into a die, the pressure is maintained at 13MPa and 160 ℃, the temperature is maintained for 15 seconds, the temperature is raised to 190 ℃, the ultraviolet irradiation is carried out for 10 minutes, and the heat preservation treatment is carried out for 8 hours, so that the friction material of the disc brake pad is prepared.
The aluminum silicate ceramic fiber has a diameter of 5 mu m, a length of 1.5mm, a particle size of expanded leech of 30-35 meshes, a particle size of talcum powder of 320 meshes, a particle size of zircon powder of 320 meshes, a particle size of corundum powder of 600 meshes, a particle size of brucite of 320 meshes, a particle size of zeolite of 320 meshes, a grapheme carbon content of 95%, a particle size of barium sulfate of 400 meshes, a diameter of chopped copper fiber of 200 mu m and a length of 3mm.
The modified phenolic resin is prepared by the following steps:
step A1: uniformly mixing KH560, sodium hydroxide and deionized water, reacting for 3 hours at the speed of 200r/min and the temperature of 80 ℃, cooling to 20 ℃, continuing to react for 70 hours, filtering to remove filtrate, dissolving a substrate in toluene, adding triethylamine, stirring and dropwise adding methylvinyldichlorosilane at the speed of 150r/min and the temperature of 20 ℃, reacting for 3 hours, filtering to remove filtrate, and drying the substrate to obtain an intermediate 1;
step A2: uniformly mixing the intermediate 1, p-aminophenol and toluene, reacting for 3 hours at the rotating speed of 150r/min and the temperature of 20 ℃ and the pH value of alkalinity, preparing modified monomers, uniformly mixing the modified monomers, phenol, sodium hydroxide solution and formaldehyde aqueous solution, reacting for 2 hours at the rotating speed of 200r/min and the temperature of 60 ℃, heating to 95 ℃, continuing to react for 1 hour, and distilling and dehydrating to prepare the modified phenolic resin.
The dosage ratio of KH560, sodium hydroxide and deionized water in the step A1 is 8mmol:4mmol:15mL, the molar ratio of the substrate to the methylvinyldichlorosilane is 1:2, and the dosage of triethylamine is 1% of the mass of the substrate to the methylvinyldichlorosilane.
The molar ratio of the epoxy group on the intermediate 1 to the amino group on the p-aminophenol in the step A2 is 1:1, the mass ratio of the modified monomer, the phenol, the sodium hydroxide solution and the formaldehyde aqueous solution is 95:7.6:2:121, the mass fraction of the sodium hydroxide solution is 50%, and the mass fraction of the formaldehyde aqueous solution is 37%.
The modified aramid pulp is prepared by the following steps:
step B1: soaking aramid pulp in acetone, performing ultrasonic treatment at a power of 100W and a temperature of 25 ℃ for 3 hours, drying, dispersing in ethanol, stirring at a rotating speed of 150r/min and a temperature of 30 ℃, adding deionized water, ammonia water and ethyl orthosilicate, reacting for 2 hours, filtering to remove filtrate, washing a substrate with deionized water until the solution is clear, and drying to obtain pretreated aramid pulp;
step B2: dispersing the pretreated aramid pulp in deionized water, adding sodium hydroxide, stirring for 20 hours at the speed of 200r/min and the temperature of 30 ℃, filtering to remove filtrate, washing a substrate with deionized water until the washing liquid is neutral, dispersing in deionized water, adding 3-mercaptopropyl triethoxysilane, reacting for 3 hours at the speed of 150r/min and the temperature of 50 ℃, filtering and drying to obtain the modified aramid pulp.
The mass ratio of the aramid pulp, the ethanol, the deionized water, the ammonia water and the tetraethoxysilane in the step B1 is 3.2:150:16:2.7:3.85.
The mass ratio of the pretreated aramid pulp to the deionized water to the sodium hydroxide in the step B2 is 3:100:0.65, and the dosage of the 3-mercaptopropyl triethoxysilane is 3% of the mass of the pretreated aramid pulp.
Embodiment 2 a production process of a friction material of a disc brake pad, which specifically comprises the following steps:
step S1: weighing the following raw materials in parts by weight: 10 parts of modified phenolic resin, 3 parts of modified aramid pulp, 35 parts of aluminum silicate ceramic fiber, 4 parts of expanded vermiculite, 3 parts of talcum powder, 2 parts of zircon powder, 2 parts of corundum powder, 3 parts of brucite, 2 parts of zeolite, 6 parts of graphite, 14 parts of barium sulfate and 15 parts of chopped copper fiber;
step S2: after the raw materials are uniformly mixed, the mixture is added into a die, the pressure is maintained at 14MPa and the temperature is 165 ℃, the temperature is maintained for 15 seconds, the temperature is raised to 190 ℃, the ultraviolet irradiation is carried out for 15 minutes, and the heat preservation treatment is carried out for 9 hours, so that the friction material of the disc brake pad is prepared.
The aluminum silicate ceramic fiber has the diameter of 8 mu m, the length of 1.8mm, the particle size of expanded leech of 30 meshes, the particle size of talcum powder of 320 meshes, the particle size of zircon powder of 320 meshes, the particle size of corundum powder of 600 meshes, the particle size of brucite of 320 meshes, the particle size of zeolite of 320 meshes, the carbon content of graphene of 95%, the particle size of barium sulfate of 400 meshes, the diameter of chopped copper fiber of 200 mu m and the length of 5mm.
The modified phenolic resin is prepared by the following steps:
step A1: uniformly mixing KH560, sodium hydroxide and deionized water, reacting for 4 hours at the speed of 200r/min and the temperature of 85 ℃, cooling to 20 ℃, continuing to react for 75 hours, filtering to remove filtrate, dissolving a substrate in toluene, adding triethylamine, stirring and dropwise adding methylvinyldichlorosilane at the speed of 180r/min and the temperature of 20 ℃, reacting for 4 hours, filtering to remove filtrate, and drying the substrate to obtain an intermediate 1;
step A2: uniformly mixing the intermediate 1, p-aminophenol and toluene, reacting for 4 hours at the rotation speed of 150r/min and the temperature of 25 ℃ and the pH value of alkalinity to obtain a modified monomer, uniformly mixing the modified monomer, phenol, sodium hydroxide solution and formaldehyde aqueous solution, reacting for 3 hours at the rotation speed of 200r/min and the temperature of 65 ℃, heating to 95 ℃, continuing to react for 1.5 hours, and distilling and dehydrating to obtain the modified phenolic resin.
The dosage ratio of KH560, sodium hydroxide and deionized water in the step A1 is 8mmol:4mmol:15mL, the molar ratio of the substrate to the methylvinyldichlorosilane is 1:2, and the dosage of triethylamine is the mass sum of the substrate and the methylvinyldichlorosilane and 2%.
The molar ratio of the epoxy group on the intermediate 1 to the amino group on the p-aminophenol in the step A2 is 1:1, the mass ratio of the modified monomer, the phenol, the sodium hydroxide solution and the formaldehyde aqueous solution is 95:7.6:2:121, the mass fraction of the sodium hydroxide solution is 50%, and the mass fraction of the formaldehyde aqueous solution is 37%.
The modified aramid pulp is prepared by the following steps:
step B1: soaking aramid pulp in acetone, performing ultrasonic treatment for 4 hours at the power of 110W and the temperature of 28 ℃, drying, dispersing in ethanol again, stirring at the rotating speed of 150r/min and the temperature of 35 ℃, adding deionized water, ammonia water and ethyl orthosilicate, reacting for 3 hours, filtering to remove filtrate, washing a substrate with deionized water until the solution is clear, and drying to obtain pretreated aramid pulp;
step B2: dispersing the pretreated aramid pulp in deionized water, adding sodium hydroxide, stirring for 25 hours at the speed of 200r/min and the temperature of 35 ℃, filtering to remove filtrate, washing a substrate with deionized water until the washing liquid is neutral, dispersing in deionized water, adding 3-mercaptopropyl triethoxysilane, reacting for 4 hours at the speed of 200r/min and the temperature of 55 ℃, filtering and drying to obtain the modified aramid pulp.
The mass ratio of the aramid pulp, the ethanol, the deionized water, the ammonia water and the tetraethoxysilane in the step B1 is 3.2:150:16:2.7:3.85.
The mass ratio of the pretreated aramid pulp to the deionized water to the sodium hydroxide in the step B2 is 3:100:0.65, and the dosage of the 3-mercaptopropyl triethoxysilane is 4% of the mass of the pretreated aramid pulp.
Embodiment 3 a production process of a friction material of a disc brake pad, which specifically comprises the following steps:
step S1: weighing the following raw materials in parts by weight: 12 parts of modified phenolic resin, 5 parts of modified aramid pulp, 40 parts of aluminum silicate ceramic fiber, 5 parts of expanded vermiculite, 4 parts of talcum powder, 3 parts of zircon powder, 3 parts of corundum powder, 4 parts of brucite, 3 parts of zeolite, 7 parts of graphite, 15 parts of barium sulfate and 18 parts of chopped copper fiber;
step S2: after the raw materials are uniformly mixed, the mixture is added into a die, the pressure is maintained at 15MPa and 170 ℃ for 15 seconds, the temperature is raised to 195 ℃ and the ultraviolet radiation is carried out for 15 minutes, and then the heat preservation treatment is carried out for 10 hours, so that the friction material of the disc brake pad is prepared.
The aluminum silicate ceramic fiber has the diameter of 10 mu m, the length of 2mm, the particle size of expanded leech of 30-35 meshes, the particle size of talcum powder of 320 meshes, the particle size of zircon powder of 320 meshes, the particle size of corundum powder of 600 meshes, the particle size of brucite of 320 meshes, the particle size of zeolite of 320 meshes, the carbon content of graphene of 95%, the particle size of barium sulfate of 400 meshes, the diameter of chopped copper fiber of 200 mu m and the length of 5mm.
The modified phenolic resin is prepared by the following steps:
step A1: uniformly mixing KH560, sodium hydroxide and deionized water, reacting at 300r/min and 85 ℃ for 5 hours, cooling to 25 ℃ for continuous reaction for 75 hours, filtering to remove filtrate, dissolving a substrate in toluene, adding triethylamine, stirring and dropwise adding methylvinyldichlorosilane at 200r/min and 25 ℃ for 4 hours, filtering to remove filtrate, and drying the substrate to obtain an intermediate 1;
step A2: uniformly mixing the intermediate 1, p-aminophenol and toluene, reacting for 5 hours at the rotation speed of 200r/min and the temperature of 25 ℃ and the pH value of alkalinity to obtain a modified monomer, uniformly mixing the modified monomer, phenol, sodium hydroxide solution and formaldehyde aqueous solution, reacting for 3 hours at the rotation speed of 300r/min and the temperature of 70 ℃, heating to 98 ℃, continuing to react for 1.5 hours, and distilling and dehydrating to obtain the modified phenolic resin.
The dosage ratio of KH560, sodium hydroxide and deionized water in the step A1 is 8mmol:4mmol:15mL, the molar ratio of the substrate to the methylvinyldichlorosilane is 1:2, and the dosage of triethylamine is 3% of the mass of the substrate to the methylvinyldichlorosilane.
The molar ratio of the epoxy group on the intermediate 1 to the amino group on the p-aminophenol in the step A2 is 1:1, the mass ratio of the modified monomer, the phenol, the sodium hydroxide solution and the formaldehyde aqueous solution is 95:7.6:2:121, the mass fraction of the sodium hydroxide solution is 50%, and the mass fraction of the formaldehyde aqueous solution is 37%.
The modified aramid pulp is prepared by the following steps:
step B1: soaking aramid pulp in acetone, performing ultrasonic treatment at a power of 120W and a temperature of 30 ℃ for 5 hours, drying, dispersing in ethanol, stirring and adding deionized water, ammonia water and ethyl orthosilicate at a rotating speed of 200r/min and a temperature of 40 ℃ for reaction for 3 hours, filtering to remove filtrate, washing a substrate with deionized water until the solution is clear, and drying to obtain pretreated aramid pulp;
step B2: dispersing the pretreated aramid pulp in deionized water, adding sodium hydroxide, stirring for 25 hours at the speed of 300r/min and the temperature of 40 ℃, filtering to remove filtrate, washing a substrate with deionized water until the washing liquid is neutral, dispersing in deionized water, adding 3-mercaptopropyl triethoxysilane, reacting for 5 hours at the speed of 200r/min and the temperature of 60 ℃, filtering and drying to obtain the modified aramid pulp.
The mass ratio of the aramid pulp, the ethanol, the deionized water, the ammonia water and the tetraethoxysilane in the step B1 is 3.2:150:16:2.7:3.85.
The mass ratio of the pretreated aramid pulp to the deionized water to the sodium hydroxide in the step B2 is 3:100:0.65, and the dosage of the 3-mercaptopropyl triethoxysilane is 5% of the mass of the pretreated aramid pulp.
Comparative example 1
This comparative example was performed in the same manner as example 1 except that the aramid pulp was used instead of the modified aramid pulp.
Comparative example 2
This comparative example uses phenolic resin PF-6530A instead of modified phenolic resin as in example 1, with the remainder of the procedure being the same.
The friction materials prepared in examples 1-3 and comparative examples 1-2 were prepared into 25mm×25mm×7mm samples, and friction coefficients were measured on an XL112 type constant speed friction tester according to the standard of GB5763-2008, the friction plate material was HT250, the rotational speed was 8r/s, 100N was loaded, the temperature rise test temperatures were 100, 150, 200, 250, 300, 350, 400℃in this order, and the test temperature nodes were rotated by 5000r, and the test results were shown in the following table.
From the above table, it can be seen that the friction material prepared by the present invention has a good friction coefficient and thermal stability.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (7)
1. A friction material of disc brake pad and its production process are characterized in that: the method specifically comprises the following steps:
step S1: weighing the following raw materials in parts by weight: 8-12 parts of modified phenolic resin, 2-5 parts of modified aramid pulp, 30-40 parts of aluminum silicate ceramic fiber, 3-5 parts of expanded vermiculite, 2-4 parts of talcum powder, 1-3 parts of zircon powder, 1-3 parts of corundum powder, 2-4 parts of brucite, 1-3 parts of zeolite, 5-7 parts of graphite, 13-15 parts of barium sulfate and 12-18 parts of chopped copper fiber;
step S2: after the raw materials are uniformly mixed, the mixture is added into a die, the pressure is 13-15MPa, the temperature is 160-170 ℃, the temperature is maintained for 15s, the temperature is raised to 190-195 ℃, the ultraviolet irradiation is carried out for 10-15min, and the heat preservation treatment is carried out for 8-10h, thus obtaining the friction material for the disc brake pad.
2. The friction material for a disc brake pad and the production process thereof according to claim 1, wherein: the modified phenolic resin is prepared by the following steps:
step A1: mixing KH560, sodium hydroxide and deionized water for reaction, cooling for continuous reaction, filtering to remove filtrate, dissolving a substrate in toluene, adding triethylamine, stirring and dropwise adding methylvinyldichlorosilane for reaction, filtering to remove filtrate, and drying the substrate to obtain an intermediate 1;
step A2: mixing the intermediate 1, p-aminophenol and toluene for reaction to obtain a modified monomer, mixing the modified monomer, phenol, sodium hydroxide solution and formaldehyde aqueous solution for reaction, heating for continuous reaction, and distilling and dehydrating to obtain the modified phenolic resin.
3. The friction material for a disc brake pad and the production process thereof according to claim 2, wherein: the dosage ratio of KH560, sodium hydroxide and deionized water in the step A1 is 8mmol:4mmol:15mL, the molar ratio of the substrate to the methylvinyldichlorosilane is 1:2, and the dosage of triethylamine is 1-3% of the mass of the substrate and the methylvinyldichlorosilane.
4. The friction material for a disc brake pad and the production process thereof according to claim 2, wherein: the molar ratio of the epoxy group on the intermediate 1 to the amino group on the p-aminophenol in the step A2 is 1:1, the mass ratio of the modified monomer, the phenol, the sodium hydroxide solution and the formaldehyde aqueous solution is 95:7.6:2:121, the mass fraction of the sodium hydroxide solution is 50%, and the mass fraction of the formaldehyde aqueous solution is 37%.
5. The friction material for a disc brake pad and the production process thereof according to claim 1, wherein: the modified aramid pulp is prepared by the following steps:
step B1: soaking aramid pulp in acetone, performing ultrasonic treatment, drying, dispersing in ethanol, stirring, adding deionized water, ammonia water and ethyl orthosilicate, reacting, filtering to remove filtrate, washing a substrate with deionized water until the solution is clear, and drying to obtain pretreated aramid pulp;
step B2: dispersing the pretreated aramid pulp in deionized water, adding sodium hydroxide, stirring, filtering to remove filtrate, washing a substrate with deionized water until the washing solution is neutral, dispersing in deionized water, adding 3-mercaptopropyl triethoxysilane, reacting, filtering and drying to obtain the modified aramid pulp.
6. The friction material for a disc brake pad and the production process thereof according to claim 5, wherein: the mass ratio of the aramid pulp, the ethanol, the deionized water, the ammonia water and the tetraethoxysilane in the step B1 is 3.2:150:16:2.7:3.85.
7. The friction material for a disc brake pad and the production process thereof according to claim 5, wherein: the mass ratio of the pretreated aramid pulp to the deionized water to the sodium hydroxide in the step B2 is 3:100:0.65, and the dosage of the 3-mercaptopropyl triethoxysilane is 3-5% of the mass of the pretreated aramid pulp.
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