CN112980392A - Wear-resistant low-noise soft brake pad and preparation method thereof - Google Patents
Wear-resistant low-noise soft brake pad and preparation method thereof Download PDFInfo
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- CN112980392A CN112980392A CN202110235427.XA CN202110235427A CN112980392A CN 112980392 A CN112980392 A CN 112980392A CN 202110235427 A CN202110235427 A CN 202110235427A CN 112980392 A CN112980392 A CN 112980392A
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- 238000002360 preparation method Methods 0.000 title abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229920001971 elastomer Polymers 0.000 claims abstract description 34
- 239000005060 rubber Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 28
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 27
- 239000010439 graphite Substances 0.000 claims abstract description 27
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 21
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000010455 vermiculite Substances 0.000 claims abstract description 17
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 17
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910021383 artificial graphite Inorganic materials 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000000571 coke Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 11
- 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 11
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 239000011777 magnesium Substances 0.000 claims abstract description 11
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 11
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000012783 reinforcing fiber Substances 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 229920002367 Polyisobutene Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920006015 heat resistant resin Polymers 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002783 friction material Substances 0.000 description 4
- 239000010425 asbestos Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003831 antifriction material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 239000004760 aramid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Images
Classifications
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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
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- 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
-
- 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
- F16D2200/0034—Materials; Production methods therefor non-metallic
-
- 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
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Organic Chemistry (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a wear-resistant low-noise soft brake pad and a preparation method thereof, wherein the wear-resistant low-noise soft brake pad comprises the following raw materials in parts by weight: antifriction rubber particles, barite powder, artificial graphite, friction powder, coke, yellow vermiculite, high-temperature calcined alumina, flake graphite containing 94% of fixed carbon, aramid fiber, zircon powder, calcium sulfate whisker, magnesium oxide containing 90% of magnesium and talcum powder. The wear-resistant low-noise soft brake pad is prepared by standardized steps of material mixing, pressing and curing at specific temperature, pressure and time. The wear-resistant low-noise soft brake pad has stable friction coefficient and excellent wear resistance, and is less in dust falling, low in noise and perfect in brake experience in the brake process.
Description
Technical Field
The invention belongs to the technical field of brake materials, and particularly relates to a wear-resistant low-noise soft brake pad and a preparation method thereof.
Background
With the rapid development of transportation industry, the speed of vehicles is continuously accelerated, the service life of the vehicles is continuously prolonged, the driving safety is continuously improved, and the requirements on vehicle braking systems are also continuously improved. In the research of automobiles and high-speed trains, the following are found: in a brake system of a vehicle, a brake pad is the most critical safety component, the brake pad plays a main role in controlling the braking effect, and the requirements of the brake pad on wear-resistant materials are higher and higher.
The brake pads in the current market are mainly classified into the following types: asbestos brake pads, NAO formula brake pads, semi-metal brake pads, less-metal brake pads and ceramic brake pads. The asbestos brake pad is basically eliminated, the NAO formula brake pad is a non-asbestos organic matter type brake pad, about half of substances contained in a semimetal brake pad are iron, generally steel wool and iron powder, and a few metal brake pad is a substance containing a small amount of iron, generally steel wool and iron powder, and a ceramic brake pad comprises mineral fibers, aramid fibers and ceramic fibers.
Most of brake pads in the current market are hard formulations, and the brake pads of the formulations have the defects of poor flexibility, poor adhesion and poor toughness, and are easy to cause much ash drop and high noise.
Disclosure of Invention
Objects of the invention
In view of the defects of the prior art, the invention aims to provide a wear-resistant low-noise soft brake pad and a preparation method thereof, and the soft brake pad prepared by adopting the formula and the preparation method overcomes the problems of much ash falling and high noise of the brake pad in the prior art.
(II) technical scheme
In order to solve the problems, the invention provides a wear-resistant low-noise soft brake pad which comprises the following raw materials in parts by weight: 48-54 parts of antifriction rubber particles, 7.5-13 parts of barite powder, 2-7 parts of artificial graphite, 1-6 parts of friction powder, 4-9 parts of coke, 1-6 parts of vermiculite powder, 0.4-5 parts of high-temperature calcined alumina, 7-16 parts of flake graphite containing 94% of fixed carbon, 1-5 parts of aramid fiber, 2-8 parts of zircon powder, 1-5 parts of calcium sulfate whisker, 1-6 parts of magnesium oxide containing 90% of magnesium and 1-3 parts of talcum powder;
the anti-friction rubber particles comprise the following raw materials in parts by weight: 8 parts of rubber, 7 parts of reinforcing fiber and 12 parts of thermosetting resin; the anti-friction rubber particles can ensure that the brake pad is soft, noiseless, temperature-resistant, wear-resistant, safe, comfortable and stable in friction coefficient;
the rubber is one or more of styrene butadiene rubber, nitrile butadiene rubber, chlorinated polyisobutylene rubber and rubber silicone rubber;
the reinforced fiber is one or more of metal fiber, glass fiber and carbon fiber;
the thermosetting resin is phenolic resin or special heat-resistant resin.
Furthermore, the fineness of the artificial graphite is 40-80 meshes. The graphite is an antifriction material, and the graphite has a layered structure, so that the friction coefficient can be effectively reduced, a good antifriction effect can be achieved in the friction process, meanwhile, the abrasion of the brake pad can be reduced, the dual is protected, and the friction coefficient is stabilized.
Furthermore, the fineness of the coke is 12-65 meshes.
Furthermore, the fineness of the yellow vermiculite is 20-40 meshes. The yellow vermiculite mainly has excellent sound absorption function and reduces the noise of the brake.
Further, the fineness of the flake graphite containing 94% of fixed carbon is 80 meshes.
As a further scheme of the invention: the composite material comprises the following raw materials in parts by weight: 49-53 parts of antifriction rubber particles, 9-12 parts of barite powder, 3-6 parts of artificial graphite, 2-5 parts of friction powder, 5-8 parts of coke, 2-5 parts of vermiculite powder, 0.4-3 parts of high-temperature calcined alumina, 9-14 parts of flake graphite containing 94% of fixed carbon, 1-3 parts of aramid fiber, 3-6 parts of zircon powder, 1-2 parts of calcium sulfate whisker, 1-3 parts of magnesium oxide containing 90% of magnesium and 1-2 parts of talcum powder.
As a still further scheme of the invention: the composite material comprises the following raw materials in parts by weight: 51 parts of antifriction rubber particles, 10.5 parts of barite powder, 5 parts of artificial graphite, 3 parts of friction powder, 6 parts of coke, 3 parts of vermiculite, 0.5 part of high-temperature calcined alumina, 12 parts of flake graphite containing 94% of fixed carbon, 1 part of aramid fiber, 4 parts of zircon powder, 1 part of calcium sulfate whisker, 2 parts of magnesium powder containing 90% of magnesium and 1 part of talcum powder.
The invention also provides a preparation method of the wear-resistant low-noise soft brake pad, which comprises the following steps:
(1) mixing materials: mixing materials by using a plow rake type mixer or a vertical high-speed mixer with a reamer, adding all raw materials except aramid fiber and crystalline flake graphite into the mixer, and starting the reamer to mix for 6.5 minutes; then adding aramid fiber and crystalline flake graphite and starting a reamer to mix for 0.5-1.5 minutes; storing in a metal or plastic container with a cover; placing for a minimum of 1 day before use; the longest effective period is 120 days;
(2) pressing: pressing by using a hydraulic machine and a six-cavity die, and adjusting the temperature of the pressing die to 155-165 ℃; coating a rubber type release agent; when the die is arranged for pressing, pressurizing to 20MPa, keeping for 20 seconds, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 260 seconds, then unloading and demoulding for 360 seconds; pressurizing to 20MPa for 20 seconds during barrel mold pressing, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 180 seconds, and then unloading and demoulding for 280 seconds;
(3) and (3) curing: and (3) curing by using an air drying oven, wherein the curing temperature is increased to 140 ℃ within 1 hour, kept at 140 ℃ within 1 hour, increased to 160 ℃ within 1 hour, kept at 160 ℃ within 2 hours, increased to 170 ℃ within 1 hour, kept at 170 ℃ within 4 hours, and counted for 10 hours, and after 1 hour of curing, opening the oven, cooling and taking out the oven.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
1. according to the wear-resistant low-noise soft brake pad provided by the invention, due to reasonable selection and matching of the inorganic material, the organic material and the soft material and the hard material, when the friction material is in contact friction with a friction couple, the friction material is well attached, the friction area is increased, soft and hard combination is achieved, and the effect of being hard and soft is achieved, so that the friction material has a stable friction coefficient and excellent wear resistance, the use safety and the service life of the material are improved, and due to the increase of the toughness of the friction material, the braking noise is obviously reduced, and the comfort of braking is improved.
2. The wear-resistant low-noise soft brake pad provided by the invention has high heat resistance level, stable friction coefficient and extremely low thermal expansion rate when the brake pad operates at a high temperature of more than 300 ℃, can not generate a locking phenomenon when braking, greatly improves the braking performance of an automobile, and has no dust falling, no noise, good wear resistance and perfect braking experience in the braking process.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention.
Reference numerals:
1. step 1, mixing materials, step 2, pressing, step 3 and curing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The invention discloses a wear-resistant low-noise soft brake pad and a preparation method thereof, which are respectively explained in detail below.
Example 1:
the invention provides a wear-resistant low-noise soft brake pad, which comprises the following raw materials in parts by weight: 48-54 parts of antifriction rubber particles, 7.5-13 parts of barite powder, 2-7 parts of artificial graphite, 1-6 parts of friction powder, 4-9 parts of coke, 1-6 parts of vermiculite powder, 0.4-5 parts of high-temperature calcined alumina, 7-16 parts of flake graphite containing 94% of fixed carbon, 1-5 parts of aramid fiber, 2-8 parts of zircon powder, 1-5 parts of calcium sulfate whisker, 1-6 parts of magnesium oxide containing 90% of magnesium and 1-3 parts of talcum powder;
the anti-friction rubber particles comprise the following raw materials in parts by weight: 8 parts of rubber, 7 parts of reinforcing fiber and 12 parts of thermosetting resin;
the rubber is one or more of styrene butadiene rubber, nitrile butadiene rubber, chlorinated polyisobutylene rubber and rubber silicone rubber;
the reinforced fiber is one or more of metal fiber, glass fiber and carbon fiber;
the thermosetting resin is phenolic resin or special heat-resistant resin.
Preferably, the fineness of the artificial graphite is 40-80 meshes. The graphite is an antifriction material, and the graphite has a layered structure, so that the friction coefficient can be effectively reduced, a good antifriction effect can be achieved in the friction process, meanwhile, the abrasion of the brake pad can be reduced, the dual is protected, and the friction coefficient is stabilized.
Preferably, the fineness of the coke is 12 to 65 meshes.
Preferably, the fineness of the yellow vermiculite is 20-40 meshes. The yellow vermiculite mainly has excellent sound absorption function and reduces the noise of the brake.
Preferably, the flake graphite containing 94% of fixed carbon has a fineness of 80 mesh.
Preferably, the wear-resistant low-noise soft brake pad comprises the following raw materials in parts by weight: 49-53 parts of antifriction rubber particles, 9-12 parts of barite powder, 3-6 parts of artificial graphite, 2-5 parts of friction powder, 5-8 parts of coke, 2-5 parts of vermiculite powder, 0.4-3 parts of high-temperature calcined alumina, 9-14 parts of flake graphite containing 94% of fixed carbon, 1-3 parts of aramid fiber, 3-6 parts of zircon powder, 1-2 parts of calcium sulfate whisker, 1-3 parts of magnesium oxide containing 90% of magnesium and 1-2 parts of talcum powder.
Specifically, the wear-resistant low-noise soft brake pad comprises the following raw materials in parts by weight: 51 parts of antifriction rubber particles, 10.5 parts of barite powder, 5 parts of artificial graphite, 3 parts of friction powder, 6 parts of coke, 3 parts of vermiculite, 0.5 part of high-temperature calcined alumina, 12 parts of flake graphite containing 94% of fixed carbon, 1 part of aramid fiber, 4 parts of zircon powder, 1 part of calcium sulfate whisker, 2 parts of magnesium powder containing 90% of magnesium and 1 part of talcum powder.
Example 2:
FIG. 1 is a flow chart of the preparation of the present invention.
The second aspect of the invention provides a preparation method of a wear-resistant low-noise soft brake pad, which comprises the following steps:
(1) mixing materials: mixing materials by using a plow rake type mixer or a vertical high-speed mixer with a reamer, adding all raw materials except aramid fiber and crystalline flake graphite into the mixer, and starting the reamer to mix for 6.5 minutes; then adding aramid fiber and crystalline flake graphite and starting a reamer to mix for 0.5-1.5 minutes; storing in a metal or plastic container with a cover; placing for a minimum of 1 day before use; the longest effective period is 120 days;
(2) pressing: pressing by using a hydraulic machine and a six-cavity die, and adjusting the temperature of the pressing die to 155-165 ℃; coating a rubber type release agent; when the die is arranged for pressing, pressurizing to 20MPa, keeping for 20 seconds, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 260 seconds, then unloading and demoulding for 360 seconds; pressurizing to 20MPa for 20 seconds during barrel mold pressing, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 180 seconds, and then unloading and demoulding for 280 seconds;
(3) and (3) curing: and (3) curing by using an air drying oven, wherein the curing temperature is increased to 140 ℃ within 1 hour, kept at 140 ℃ within 1 hour, increased to 160 ℃ within 1 hour, kept at 160 ℃ within 2 hours, increased to 170 ℃ within 1 hour, kept at 170 ℃ within 4 hours, and counted for 10 hours, and after 1 hour of curing, opening the oven, cooling and taking out the oven.
Example 3:
the wear-resistant low-noise soft brake pad comprises the following raw materials in parts by weight: 51 parts of antifriction rubber particles, 10.5 parts of barite powder, 5 parts of artificial graphite, 3 parts of friction powder, 6 parts of coke, 3 parts of vermiculite, 0.5 part of high-temperature calcined alumina, 12 parts of flake graphite containing 94% of fixed carbon, 1 part of aramid fiber, 4 parts of zircon powder, 1 part of calcium sulfate whisker, 2 parts of magnesium powder containing 90% of magnesium and 1 part of talcum powder.
The anti-friction rubber particles comprise the following raw materials in parts by weight: 8 parts of rubber, 7 parts of reinforcing fiber and 12 parts of thermosetting resin;
the rubber is styrene butadiene rubber and nitrile butadiene rubber;
the reinforced fiber is metal fiber and carbon fiber;
the thermosetting resin is phenolic resin.
The fineness of the artificial graphite is 40-80 meshes.
The fineness of the coke is 12 meshes to 65 meshes.
The fineness of the yellow vermiculite is 20-40 meshes.
The fineness of the flake graphite containing 94% of fixed carbon is 80 meshes.
The preparation method of the wear-resistant low-noise soft brake pad comprises the following steps:
(1) mixing materials: mixing materials by using a plow rake type mixer or a vertical high-speed mixer with a reamer, adding all raw materials except aramid fiber and crystalline flake graphite into the mixer, and starting the reamer to mix for 6.5 minutes; then adding aramid fiber and crystalline flake graphite and starting a reamer to mix for 1 minute; storing in a metal or plastic container with a cover; placing for a minimum of 1 day before use; the longest effective period is 120 days;
(2) pressing: pressing by using a hydraulic machine and a six-cavity die, and adjusting the temperature of the pressing die to 160 ℃; coating a rubber type release agent; die arrangement and pressing, pressurizing to 20MPa, keeping for 20 seconds, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 260 seconds, then unloading and demoulding for 360 seconds;
(3) and (3) curing: and (3) curing by using an air drying oven, wherein the curing temperature is increased to 140 ℃ within 1 hour, kept at 140 ℃ within 1 hour, increased to 160 ℃ within 1 hour, kept at 160 ℃ within 2 hours, increased to 170 ℃ within 1 hour, kept at 170 ℃ within 4 hours, and counted for 10 hours, and after 1 hour of curing, opening the oven, cooling and taking out the oven.
The test result of the prepared wear-resistant low-noise soft brake pad according to the GB/T5763-2008 standard is as follows:
the test result of the prepared wear-resistant low-noise soft brake pad according to SAE J-661 is as follows:
grade of coefficient of friction
| Normal＝ | 0.361 | F |
| Hot＝ | 0.413 | F |
Wear and tear
| Start | Finish | Loss | ％Loss | |
| Weight(g) | 7.45 | 7.14 | 0.31 | 4.16 |
| Thick.(mm) | 6.2 | 5.99 | 0.21 | 3.39 |
The test result of the prepared wear-resistant low-noise soft brake pad according to ECER90 is as follows:
it is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. The utility model provides a wear-resisting low noise soft brake block which characterized in that: the composite material comprises the following raw materials in parts by weight: 48-54 parts of antifriction rubber particles, 7.5-13 parts of barite powder, 2-7 parts of artificial graphite, 1-6 parts of friction powder, 4-9 parts of coke, 1-6 parts of vermiculite powder, 0.4-5 parts of high-temperature calcined alumina, 7-16 parts of flake graphite containing 94% of fixed carbon, 1-5 parts of aramid fiber, 2-8 parts of zircon powder, 1-5 parts of calcium sulfate whisker, 1-6 parts of magnesium oxide containing 90% of magnesium and 1-3 parts of talcum powder;
the anti-friction rubber particles comprise the following raw materials in parts by weight: 8 parts of rubber, 7 parts of reinforcing fiber and 12 parts of thermosetting resin;
the rubber is one or more of styrene butadiene rubber, nitrile butadiene rubber, chlorinated polyisobutylene rubber and rubber silicone rubber;
the reinforced fiber is one or more of metal fiber, glass fiber and carbon fiber;
the thermosetting resin is phenolic resin or special heat-resistant resin.
2. The wear-resistant low-noise soft brake pad according to claim 1, wherein: the fineness of the artificial graphite is 40-80 meshes.
3. The wear-resistant low-noise soft brake pad according to claim 2, wherein: the fineness of the coke is 12-65 meshes.
4. The wear-resistant low-noise soft brake pad according to claim 3, wherein: the fineness of the yellow vermiculite is 20-40 meshes.
5. The wear-resistant low-noise soft brake pad according to claim 4, wherein: the fineness of the flake graphite containing 94% of fixed carbon is 80 meshes.
6. The wear-resistant low-noise soft brake pad according to claim 5, wherein: the composite material comprises the following raw materials in parts by weight: 49-53 parts of antifriction rubber particles, 9-12 parts of barite powder, 3-6 parts of artificial graphite, 2-5 parts of friction powder, 5-8 parts of coke, 2-5 parts of vermiculite powder, 0.4-3 parts of high-temperature calcined alumina, 9-14 parts of flake graphite containing 94% of fixed carbon, 1-3 parts of aramid fiber, 3-6 parts of zircon powder, 1-2 parts of calcium sulfate whisker, 1-3 parts of magnesium oxide containing 90% of magnesium and 1-2 parts of talcum powder.
7. The wear-resistant low-noise soft brake pad according to claim 5, wherein: the composite material comprises the following raw materials in parts by weight: 51 parts of antifriction rubber particles, 10.5 parts of barite powder, 5 parts of artificial graphite, 3 parts of friction powder, 6 parts of coke, 3 parts of vermiculite, 0.5 part of high-temperature calcined alumina, 12 parts of flake graphite containing 94% of fixed carbon, 1 part of aramid fiber, 4 parts of zircon powder, 1 part of calcium sulfate whisker, 2 parts of magnesium powder containing 90% of magnesium and 1 part of talcum powder.
8. A method for preparing the wear-resistant low-noise soft brake pad of any one of claims 1 to 7, which is characterized by comprising the following steps: the method comprises the following steps:
(1) mixing materials: mixing materials by using a plow rake type mixer or a vertical high-speed mixer with a reamer, adding all raw materials except aramid fiber and crystalline flake graphite into the mixer, and starting the reamer to mix for 6.5 minutes; then adding aramid fiber and crystalline flake graphite and starting a reamer to mix for 0.5-1.5 minutes; storing in a metal or plastic container with a cover; placing for a minimum of 1 day before use; the longest effective period is 120 days;
(2) pressing: pressing by using a hydraulic machine and a six-cavity die, and adjusting the temperature of the pressing die to 155-165 ℃; coating a rubber type release agent; when the die is arranged for pressing, pressurizing to 20MPa, keeping for 20 seconds, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 260 seconds, then unloading and demoulding for 360 seconds; pressurizing to 20MPa for 20 seconds during barrel mold pressing, then deflating for 5 seconds, and repeating the pressurizing and deflating process for 4 times; maintaining the pressure for 180 seconds, and then unloading and demoulding for 280 seconds;
(3) and (3) curing: and (3) curing by using an air drying oven, wherein the curing temperature is increased to 140 ℃ within 1 hour, kept at 140 ℃ within 1 hour, increased to 160 ℃ within 1 hour, kept at 160 ℃ within 2 hours, increased to 170 ℃ within 1 hour, kept at 170 ℃ within 4 hours, and counted for 10 hours, and after 1 hour of curing, opening the oven, cooling and taking out the oven.
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Application publication date: 20210618 |