CN114085488A - Preparation method of granulating material for friction material and application of granulating material in copper-free NAO type brake pad for high-end agricultural equipment - Google Patents
Preparation method of granulating material for friction material and application of granulating material in copper-free NAO type brake pad for high-end agricultural equipment Download PDFInfo
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- CN114085488A CN114085488A CN202111180222.2A CN202111180222A CN114085488A CN 114085488 A CN114085488 A CN 114085488A CN 202111180222 A CN202111180222 A CN 202111180222A CN 114085488 A CN114085488 A CN 114085488A
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- 239000000463 material Substances 0.000 title claims abstract description 60
- 239000002783 friction material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 42
- 239000000835 fiber Substances 0.000 claims abstract description 106
- 239000010902 straw Substances 0.000 claims abstract description 99
- 238000002156 mixing Methods 0.000 claims abstract description 45
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 21
- 238000002679 ablation Methods 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000012805 post-processing Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 5
- 239000004113 Sepiolite Substances 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 239000002557 mineral fiber Substances 0.000 claims abstract description 4
- 239000011490 mineral wool Substances 0.000 claims abstract description 4
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 4
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 42
- 239000000843 powder Substances 0.000 claims description 40
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 37
- 239000010936 titanium Substances 0.000 claims description 37
- 229910052719 titanium Inorganic materials 0.000 claims description 37
- 238000005469 granulation Methods 0.000 claims description 29
- 230000003179 granulation Effects 0.000 claims description 29
- 230000002787 reinforcement Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 19
- 239000008187 granular material Substances 0.000 claims description 18
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 15
- 239000012153 distilled water Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 10
- 239000010428 baryte Substances 0.000 claims description 10
- 229910052601 baryte Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 10
- 239000005060 rubber Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 229910000077 silane Inorganic materials 0.000 claims description 10
- 229910052902 vermiculite Inorganic materials 0.000 claims description 10
- 239000010455 vermiculite Substances 0.000 claims description 10
- 235000019354 vermiculite Nutrition 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 235000005822 corn Nutrition 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910021382 natural graphite Inorganic materials 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229920002261 Corn starch Polymers 0.000 claims description 3
- 239000008120 corn starch Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 241000209149 Zea Species 0.000 claims 1
- 238000010923 batch production Methods 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000005453 pelletization Methods 0.000 claims 1
- 238000005204 segregation Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 10
- 240000008042 Zea mays Species 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
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- 239000000805 composite resin Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
-
- 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
-
- 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
- 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
- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- 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
- C08K2201/011—Nanostructured additives
-
- 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
- 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
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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 discloses a preparation method of a granulating material for a friction material and application of the granulating material in a copper-free NAO type brake pad for high-end agricultural equipment, belonging to the technical field of agricultural equipment accessories, wherein the copper-free NAO type brake pad for the high-end agricultural equipment comprises the following components in percentage by mass: 80-95% of a granulating material for a friction material, 0-10% of nitrile rubber modified phenolic resin and 2-15% of non-straw fibers; wherein the non-straw fibers comprise one of rock wool fibers, sepiolite fibers or composite mineral fibers; the preparation method comprises the following steps: preparing a granulated substance for a friction material; mixing materials and mould filling in the brake pad preparation process, hot pressing heat treatment, surface ablation and post processing molding. The preparation of the granulating material of the friction material can enhance the fluidity of the raw material of the brake pad, reduce dust pollution and fiber segregation in the preparation process of the brake pad, reduce the density and stabilize the friction factor of the brake pad, improve the wear resistance and reliability of the brake pad and reduce the dust content of the brake pad.
Description
Technical Field
The invention relates to a brake pad, in particular to a copper-free NAO type brake pad for a granulating material of a friction material and high-end agricultural equipment, and belongs to the technical field of agricultural equipment accessories.
Background
Agricultural machinery is an important carrier of modern agricultural science and technology, and agricultural mechanization is an important mark of agricultural modernization. The agricultural modernization is greatly promoted, and material equipment and technical support must be strengthened. The method steps to the overall mechanization target of the whole agricultural process, and provides the requirement for accelerating the development of high-end agricultural machinery equipment. At present, the market of high-end agricultural machinery equipment is still monopolized by imported products, and the supply of the high-end agricultural machinery equipment is insufficient. The brake block is used as the most key safety part in the agricultural machinery equipment braking system, and the performance of the brake block is directly related to the safety, stability and reliability of the operation of the agricultural machinery equipment system, especially the accuracy of the operation of high-end intelligent agricultural machinery equipment. With the acceleration of land circulation speed in China, agricultural equipment develops towards large scale and high efficiency, the intelligent, automatic and fine capabilities of high-end agricultural equipment products are continuously improved, and harsh requirements are also put forward on the performance of brake plates for the high-end agricultural equipment. Therefore, researchers engaged in brake pads for agricultural machinery equipment need to continuously explore new methods, solve new problems, and develop brake friction materials which have good comprehensive performance and meet the characteristics and requirements of high-end agricultural machinery equipment.
At present, for the high-performance automobile brake friction materials which meet different types, relevant patent reports are reported at home and abroad, such as:
the invention discloses a basalt fiber-based high-performance environment-friendly friction material and a preparation method thereof, wherein the Chinese patent publication No. 113214597A is published as 2021.08.06, and the invention discloses a friction material for automobiles;
the invention discloses a friction material for an electric automobile, a brake pad and a preparation method thereof, wherein the Chinese patent publication No. 112940447A is published as 2021.06.11, and the invention name is' the brake pad for the electric automobile;
the invention discloses a brake pad of an automobile or a rail transit vehicle, which has the Chinese patent publication number of CN110778629B and the publication date of 2021.06.04, and is named as 'a brake material containing halide and a preparation method and application thereof';
the invention discloses a drum brake pad for a new energy vehicle, which is characterized in that Chinese patent publication No. 112855814A, publication No. 2021.05.28, is entitled "a drum brake pad for a new energy vehicle with low noise and rust-proof adhesion and a preparation method thereof", and the invention discloses a drum brake pad for a new energy vehicle;
the invention discloses a Chinese patent with the publication number of 112855812A and the publication number of 2021.05.28, and the invention is named as 'a friction material for passenger vehicles suitable for high speed of 200 kilometers and high deceleration of 0.8G and a preparation method thereof', and discloses a drum brake pad for passenger vehicles;
the invention discloses a friction material for automobiles and new energy vehicles, wherein the Chinese patent publication number is CN109555802B, the publication date is 2020.08.18, and the invention name is' a friction material, an organic carbon ceramic brake pad for wear-resistant coating brake discs prepared from the friction material, and a preparation method and application of the organic carbon ceramic brake pad;
the invention discloses a friction material for an automobile, which is a ceramic particle composite resin-based heat fading resistant friction material and a preparation method thereof, wherein the Chinese patent publication number is CN106928649B, the publication date is 2019.07.05, and the invention discloses the friction material for the automobile;
the invention discloses a friction material for a heavy-duty car, which has the Chinese patent publication number of CN107061571B and publication date of 2018.11.02, and is named as 'a rear disc type brake material for a heavy-duty car and a preparation method thereof';
however, the related technologies for brake pads for high-end agricultural equipment are still relatively few, and as the agricultural equipment is developed to be large-sized and efficient, the requirement of the high-end agricultural equipment brake system industry for the performance of the high-performance brake pad is higher and higher, so that the brake pad for the high-end agricultural equipment needs to be developed aiming at the characteristics and the requirement of the high-end agricultural equipment and in the aspects of formulation, internal structure, preparation process, treatment of raw materials and the like of the brake pad when the brake pad for the high-end agricultural equipment is designed.
Disclosure of Invention
Aiming at the problems of weak binding property of straw fiber and resin matrix, unobvious single fiber reinforcing effect, poor flowability of brake pad raw materials, heavy dust pollution in the production process of brake pads, poor physical and mechanical properties of the brake pads, serious abrasion to pairs in the brake pads, unstable friction factor and poor wear resistance of the brake pads, brake dust and noise pollution, large brake vibration, copper powder dust pollution, waste of straw wastes and the like in the prior art, the preparation method of the granulation material for the friction material and the application of the granulation material in the copper-free NAO type brake pads for high-end agricultural machinery equipment are provided.
The present invention achieves the above-described object by the following technical means.
A copper-free NAO type brake pad for high-end agricultural equipment comprises the following components in percentage by mass: 80-95% of granulating material for friction material, 0-10% of nitrile rubber modified phenolic resin and 2-15% of non-straw fiber; wherein the non-straw fibers comprise one of rock wool fibers, sepiolite fibers or composite mineral fibers.
Further, the components of the granulating material for the friction material according to the mass fraction are as follows: 5-20% of nano titanium dioxide-straw fiber multi-scale reinforcement, 1-5% of rubber powder, 5-20% of nitrile rubber modified phenolic resin, 5-21% of barite, 2-10% of shale, 5-24% of alumina, 1-3% of vermiculite powder, 1-5% of tire powder, 1-5% of purple sand, 1-5% of friction powder, 3-15% of potassium titanate platelets and 2-15% of copper powder substitute material.
Further, the nano titanium dioxide-straw fiber multi-scale reinforcement body is composed of 20-70% of corn straw fibers and 30-80% of straw fibers in percentage by mass.
Further, the copper powder substitute material is composed of 20-40% of stainless steel abrasive dust and 60-80% of natural graphite by mass.
Further, the preparation method of the nano titanium dioxide-straw fiber multi-scale reinforcement comprises the following steps:
the method comprises the following steps: crushing the collected straw skin in a crusher, and then screening the crushed straw fibers;
step two: soaking the straw fiber obtained in the step one in a grafting treatment device filled with a suspension formed by nano titanium dioxide and a silane solution to obtain nano titanium dioxide-straw fiber;
step three: and (3) putting the nano titanium dioxide-straw fiber obtained in the step two into an ultrasonic cleaning machine for cleaning, and then drying in a drying box to finally obtain the nano titanium dioxide-straw fiber multi-scale reinforcement.
Further, in the step one, the crushing time t of the straw skin1Comprises the following steps: t is less than or equal to 3min1Less than or equal to 6 min; the length L1 of the straw fiber is as follows: l1 is more than or equal to 1mm and less than or equal to 3mm, and the fiber diameter D1 is as follows: d1 is more than or equal to 0.01mm and less than or equal to 0.5 mm;
in the second step, the silane solution consists of absolute ethyl alcohol, a silane coupling agent and distilled water, and the mass ratio of the components is as follows: 35-75: 6-15: 10-50, and the particle size of the nano titanium dioxide D2 is as follows: d2 is more than or equal to 2nm and less than or equal to 100nm, and the mass fraction w1 of the nano titanium dioxide in the suspension is as follows: w1 is more than or equal to 0.5 percent and less than or equal to 25 percent, and the straw fiber is soaked in the suspension for time t2Comprises the following steps: t is less than or equal to 10min2≤50min；
In step three, ultrasonic cleaning time t3Comprises the following steps: t is less than or equal to 2min3Less than or equal to 10 min; the ultrasonic cleaning temperature is room temperature; super-superThe acoustic cleaning medium is distilled water; the drying temperature T1 is as follows: t1 is more than or equal to 90 ℃ and less than or equal to 112 ℃, and the drying time T is T4Comprises the following steps: t is less than or equal to 60min4≤180min。
A method of making a copper free brake pad of the NAO type comprising the steps of:
includes the preparation of granules for friction material;
mixing materials in the brake pad preparation process;
filling a mould, hot-pressing heat treatment, surface ablation, and post-processing molding.
Further, the preparation of the granules for a friction material includes:
s1: rubber powder, nitrile rubber modified phenolic resin, barite, shale, alumina, vermiculite powder, tire powder, purple sand, friction powder, potassium titanate platelet and copper powder substitute materials are placed in a three-dimensional motion mixer to be fully mixed for mixing time t5Comprises the following steps: t is less than or equal to 3min5≤8min；
S2: putting the mixed raw material obtained in the step S1 and the nano titanium dioxide-straw fiber multi-scale reinforcement into a paddle type mixer for fully mixing for a mixing time t6Comprises the following steps: t is less than or equal to 1min6≤3min；
S3: putting the mixed raw material obtained in the step S2 into a granulator for granulation treatment, spraying bridging liquid into a granulation roller, adjusting the rotation speed of the granulation roller and a rotary cutter and the spraying amount of the bridging liquid, and fully granulating to obtain granules; the rotation speed r1 of the granulation roller is as follows: r1 is more than or equal to 20r/min and less than or equal to 350 r/min; the rotating cutter rotating speed r2 is as follows: r1 is more than or equal to 70r/min and less than or equal to 90r/min, and the bridging liquid is one of distilled water, absolute ethyl alcohol and corn starch paste solution with the mass fraction of 3 wt%;
s4: and (4) putting the granules obtained in the step (S3) into a drying box for drying treatment to obtain the final granules for the friction material, wherein the drying temperature T2 is as follows: t2 is more than or equal to 100 ℃ and less than or equal to 130 ℃, and the drying time T is7Comprises the following steps: t is more than or equal to 100min7Less than or equal to 240min, the obtained granules are in a cell-like shape, the diameter D3 is as follows: d3 is more than or equal to 1mm and less than or equal to 8 mm.
Further, the mixing process flow in the brake pad preparation process comprises the following steps:
s1: the nitrile butadiene rubber modified phenolic resin and the non-straw fiber are put into a paddle mixer for full mixing for a mixing time t8Comprises the following steps: t is less than or equal to 5min8≤20min；
S2: putting the mixture obtained in the step S1 and the granulating material for the friction material into a three-dimensional motion mixer for fully mixing for a mixing time t9Comprises the following steps: t is less than or equal to 5min9The time is less than or equal to 10min, and the final mixed material for preparing the brake pad is obtained.
Further, the method comprises the following steps of mould filling, hot-pressing heat treatment, surface ablation and post-processing molding:
s1: putting the mixed material for preparing the brake pad into a special mould for preparing the brake pad, then carrying out hot pressing treatment, finally carrying out heat treatment, and cooling to room temperature;
s2: carrying out surface ablation on the brake block sample block obtained in the step S1 in a pass-through ablation machine, and cooling to room temperature;
s3: and (5) polishing the surface of the ablation surface of the brake block sample block obtained in the step (S2), then carrying out grinding and cutting treatment, carrying out paint spraying and baking treatment for the time, and finally installing an alarm or a fixer to finally obtain the copper-free NAO type brake block.
The invention has the beneficial effects that:
1. the invention is used for preparing the granulating material of the friction material, can enhance the fluidity of the raw material of the brake pad, reduce the dust pollution and the fiber segregation in the preparation process of the brake pad, reduce the density and the stable friction factor of the brake pad, improve the wear resistance and the reliability of the brake pad and reduce the dust content of the brake pad;
2. by adopting the nano titanium dioxide-straw fiber multi-scale reinforcement, the interface bonding performance between the straw fiber and the resin matrix can be improved, the friction stress is effectively transferred, the mechanical performance and the wear-resisting performance of the brake pad are improved, and the vibration of the brake pad in the using process is reduced.
3. The nano titanium dioxide-straw fiber multi-scale reinforcement comprises 20-70% of corn straw fiber and 30-80% of straw fiber by mass, and the components can improve the utilization rate of agricultural waste straws, improve the environmental protection performance of the brake pad, reduce resource waste and reduce the production cost of the brake pad;
4. copper powder is adopted to replace materials, so that the emission of copper particles in the braking process can be prevented, the environmental pollution and the noise pollution are reduced, and the brake pad has reasonable service life.
Detailed Description
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
The preparation method of the granules for the friction material and the application of the granules in the copper-free NAO type brake pad for the high-end agricultural equipment are disclosed, wherein the copper-free NAO type brake pad for the high-end agricultural equipment contains the granules for the friction material, nitrile rubber modified phenolic resin and non-straw fiber, and the preparation process mainly comprises die filling, hot-pressing heat treatment, surface ablation, post-processing molding and the like. By adopting the process steps and the raw material components, the composition and the preparation process of the brake pad are controlled in the preparation process, and the comprehensive performance of the brake pad can be directly controlled and adjusted, so that the brake pad meets the performance requirements of high-end agricultural machinery equipment on the brake pad under different working conditions.
Example 1
The copper-free NAO type brake pad for high-end agricultural equipment comprises the following components in percentage by mass: 80% of granulating material for friction material, 5% of nitrile rubber modified phenolic resin and 15% of non-straw fiber; wherein the non-straw fiber is rock wool fiber.
The content of each component of the granulating material for the friction material in percentage by mass is as follows: 20% of nano titanium dioxide-straw fiber multi-scale reinforcement, 5% of rubber powder, 20% of nitrile rubber modified phenolic resin, 21% of barite, 10% of shale, 5% of alumina, 3% of vermiculite powder, 5% of tire powder, 1% of purple sand, 5% of friction powder, 3% of potassium titanate platelet and 2% of copper powder substitute material. Wherein, the nano titanium dioxide-straw fiber multi-scale reinforcement body consists of 20 percent of corn straw fiber and 80 percent of straw fiber according to mass fraction; the copper powder substitute material consists of 40% of stainless steel abrasive dust and 60% of natural graphite by mass.
The preparation method of the nano titanium dioxide-straw fiber multi-scale reinforcement comprises the following specific steps:
3.1 crushing the collected straw skin in a crusher for a crushing time t1Comprises the following steps: 3min, then screening the crushed straw fibers, wherein the length L1 of the straw fibers is as follows: 1mm, fiber diameter D1: 0.01 mm;
3.2 soaking the straw fiber obtained in the step 3.1 in a grafting treatment device filled with a suspension formed by nano titanium dioxide and silane solution to obtain the nano titanium dioxide-straw fiber. The silane solution consists of absolute ethyl alcohol, a silane coupling agent and distilled water, and the mass ratio of the components is as follows: 35:15:50, the particle size of the nano titanium dioxide D2 is as follows: 2nm, the mass fraction w1 of the nano titanium dioxide in the suspension is as follows: 0.5 percent of straw fiber, and the soaking time t of the straw fiber in the suspension2Comprises the following steps: 10 min;
3.3 putting the nano titanium dioxide-straw fiber obtained in the step 3.2 into an ultrasonic cleaning machine for cleaning for t3Comprises the following steps: and 2min, wherein the ultrasonic cleaning temperature is room temperature, and the ultrasonic cleaning medium is distilled water. Then drying in a drying box, wherein the drying temperature T1 is as follows: drying at 90 ℃ for a time t4Comprises the following steps: 60min, finally obtaining the nano titanium dioxide-straw fiber multi-scale reinforcement;
the preparation method of the copper-free NAO type brake pad for the high-end agricultural equipment comprises the following specific steps:
4.1 preparation of granules for friction material described in copper-free NAO type brake pads for high end agricultural equipment, comprising the steps of:
4.1.1 placing rubber powder, nitrile rubber modified phenolic resin, barite, shale, alumina, vermiculite powder, tire powder, purple sand, friction powder, potassium titanate platelets and copper powder as substitute materials in a three-dimensional moving mixer for full mixing, wherein the mixing time t5 is as follows: 8 min;
4.1.2 putting the mixed raw material obtained in the step 3.1.1 and the nano titanium dioxide-straw fiber multi-scale reinforcement into a paddle mixer for fully mixing for a mixing time t6Comprises the following steps: 3 min;
4.1.3 put the mixed raw materials obtained in step 4.1.2 into the granulator and carry out granulation processing, continuously spout bridging liquid into the granulation cylinder simultaneously, constantly adjust granulation cylinder and rotary cutter rotational speed and bridging liquid's injection quantity, after fully granulating, obtain the granulation thing, the rotational speed r1 of granulation cylinder is: 200 r/min; the rotating cutter rotating speed r2 is as follows: 90r/min, and the bridging liquid is absolute ethyl alcohol;
4.1.4 drying the granulated substance obtained in the step 4.1.3 in a drying box to obtain a final granulated substance, wherein the drying temperature T2 is as follows: drying at 130 ℃ for t7Comprises the following steps: 200min, the obtained granulation was cell-like in shape, diameter D3: 5 mm.
4.2 the material mixing process flow in the brake block preparation process comprises the following steps:
4.2.1 putting the nitrile rubber modified phenolic resin and the non-straw fiber into a paddle type mixer for fully mixing for a mixing time t8Comprises the following steps: 15 min;
4.2.2 putting the mixture obtained in the step 4.2.1 and the granules obtained in the step 4.1.4 into a three-dimensional moving mixer for fully mixing for a mixing time t9Comprises the following steps: and (5) obtaining the final mixed material for preparing the brake pad after 10 min.
4.3 die filling-hot pressing heat treatment-surface ablation-post processing molding, comprising the following steps:
4.3.1 putting the mixed material obtained in the step 4.2.2 into a special mould for a brake pad for agricultural machinery equipment, then carrying out hot pressing treatment, finally carrying out heat treatment, and cooling to room temperature;
4.3.2 carrying out surface ablation on the brake block sample block obtained in the step 4.3.1 in a pass-through ablation machine, and cooling to room temperature;
4.3.3, the surface of the ablation surface of the brake block sample block obtained in the step 4.3.2 is polished, then grinding and cutting are carried out, then paint spraying and baking are carried out, finally, an alarm or a fixer is installed, and finally the copper-free NAO type brake block for high-end agricultural equipment is obtained.
The friction factor range of the brake pad produced by the process method of the embodiment is 0.341-0.456, and the wear rate is 0.15 multiplied by 10-7cm3/Nm～0.30×10-7cm3and/Nm, the brake noise and brake dust are obviously reduced.
Example 2
The copper-free NAO type brake pad for high-end agricultural equipment comprises the following components in percentage by mass: 95% of granulating material for friction material and 5% of non-straw fiber; wherein the non-straw fiber is sepiolite fiber.
The content of each component of the granulating material for the friction material in percentage by mass is as follows: 18% of nano titanium dioxide-straw fiber multi-scale reinforcement, 1% of rubber powder, 12% of nitrile rubber modified phenolic resin, 5% of barite, 2% of shale, 24% of alumina, 1% of vermiculite powder, 1% of tire powder, 5% of purple sand, 1% of friction powder, 15% of potassium titanate platelet and 15% of copper powder substitute material. Wherein the nano titanium dioxide-straw fiber multi-scale reinforcement consists of 70% of corn straw fiber and 30% of straw fiber by mass fraction; the copper powder substitute material consists of 20% of stainless steel abrasive dust and 80% of natural graphite by mass.
The preparation method of the nano titanium dioxide-straw fiber multi-scale reinforcement comprises the following specific steps:
3.1 crushing the collected straw skin in a crusher for a crushing time t1Comprises the following steps: and 6min, screening the crushed straw fibers, wherein the length L1 of the straw fibers is as follows: 3mm, fiber diameter D1: 0.5 mm.
3.2 soaking the straw fiber obtained in the step 3.1 in a grafting treatment device filled with a suspension formed by nano titanium dioxide and silane solution to obtain the nano titanium dioxide-straw fiber. Silane solution prepared fromThe adhesive consists of absolute ethyl alcohol, a silane coupling agent and distilled water, and the mass ratio of the components is as follows: 75:6:19, the particle size of the nano titanium dioxide D2 is as follows: 100nm, the mass fraction w1 of the nano titanium dioxide in the suspension is as follows: 25 percent, soaking the straw fiber in the suspension for t2Comprises the following steps: and (5) 50 min.
3.3 putting the nano titanium dioxide-straw fiber obtained in the step 3.2 into an ultrasonic cleaning machine for cleaning for t3Comprises the following steps: and (3) performing ultrasonic cleaning at room temperature for 10min, wherein the ultrasonic cleaning medium is distilled water. Then drying in a drying box, wherein the drying temperature T1 is as follows: drying at 100 ℃ for a drying time t4Comprises the following steps: and 180min, finally obtaining the nano titanium dioxide-straw fiber multi-scale reinforcement.
The preparation method of the copper-free NAO type brake pad for the high-end agricultural equipment comprises the following specific steps:
4.1 preparation of granules for friction material described in copper-free NAO type brake pads for high end agricultural equipment, comprising the steps of:
4.1.1 placing rubber powder, nitrile rubber modified phenolic resin, barite, shale, alumina, vermiculite powder, tire powder, purple sand, friction powder, potassium titanate platelets and copper powder as substitute materials in a three-dimensional moving mixer for full mixing, wherein the mixing time t5 is as follows: 5 min;
4.1.2 putting the mixed raw material obtained in the step 3.1.1 and the nano titanium dioxide-straw fiber multi-scale reinforcement into a paddle mixer for fully mixing for a mixing time t6Comprises the following steps: 2 min;
4.1.3 put the mixed raw materials obtained in step 4.1.2 into the granulator and carry out granulation processing, continuously spout bridging liquid into the granulation cylinder simultaneously, constantly adjust granulation cylinder and rotary cutter rotational speed and bridging liquid's injection quantity, after fully granulating, obtain the granulation thing, the rotational speed r1 of granulation cylinder is: 350 r/min; the rotating cutter rotating speed r2 is as follows: 80r/min, and the bridging liquid is distilled water;
4.1.4 drying the granulated substance obtained in the step 4.1.3 in a drying box to obtain a final granulated substance, wherein the drying temperature T2 is as follows: drying at 110 ℃ for t7Comprises the following steps: 240min, the obtained granulation substance is cell-likeDiameter D3 is: 8 mm.
4.2 the material mixing process flow in the brake block preparation process comprises the following steps:
4.2.1 putting the nitrile rubber modified phenolic resin and the non-straw fiber into a paddle type mixer for fully mixing for a mixing time t8Comprises the following steps: 5 min;
4.2.2 putting the mixture obtained in the step 4.2.1 and the granules obtained in the step 4.1.4 into a three-dimensional moving mixer for fully mixing for a mixing time t9Comprises the following steps: and 8min to obtain the final mixed material for preparing the brake pad.
4.3 die filling-hot pressing heat treatment-surface ablation-post processing molding, comprising the following steps:
4.3.1 putting the mixed material obtained in the step 4.2.2 into a special mould for a brake pad for agricultural machinery equipment, then carrying out hot pressing treatment, finally carrying out heat treatment, and cooling to room temperature;
4.3.2 carrying out surface ablation on the brake block sample block obtained in the step 4.3.1 in a pass-through ablation machine, and cooling to room temperature;
4.3.3, the surface of the ablation surface of the brake block sample block obtained in the step 4.3.2 is polished, then grinding and cutting are carried out, then paint spraying and baking are carried out, finally, an alarm or a fixer is installed, and finally the copper-free NAO type brake block for high-end agricultural equipment is obtained.
The friction factor range of the brake pad produced by the process method of the embodiment is 0.331-0.446, and the wear rate is 0.14 multiplied by 10-7cm3/Nm～0.32×10-7cm3and/Nm, the brake noise and brake dust are obviously reduced.
Example 3
The copper-free NAO type brake pad for high-end agricultural equipment comprises the following components in percentage by mass: 88% of granulating material for friction material, 10% of nitrile rubber modified phenolic resin and 2% of non-straw fiber; wherein the non-straw fiber is composite mineral fiber.
The content of each component of the granulating material for the friction material in percentage by mass is as follows: 5% of nano titanium dioxide-straw fiber multi-scale reinforcement, 4% of rubber powder, 5% of nitrile rubber modified phenolic resin, 19% of barite, 8% of shale, 22% of alumina, 2% of vermiculite powder, 3% of tire powder, 3% of purple sand, 3% of friction powder, 12% of potassium titanate platelet and 14% of copper powder substitute material. Wherein, the nano titanium dioxide-straw fiber multi-scale reinforcement body consists of 50 percent of corn straw fiber and 50 percent of straw fiber according to mass fraction; the copper powder substitute material consists of 30% of stainless steel abrasive dust and 70% of natural graphite by mass.
The preparation method of the nano titanium dioxide-straw fiber multi-scale reinforcement comprises the following specific steps:
3.1 crushing the collected straw skin in a crusher for a crushing time t1Comprises the following steps: 5min, then screening the crushed straw fibers, wherein the length L1 of the straw fibers is as follows: 2mm, fiber diameter D1: 0.05 mm.
3.2 soaking the straw fiber obtained in the step 3.1 in a grafting treatment device filled with a suspension formed by nano titanium dioxide and silane solution to obtain the nano titanium dioxide-straw fiber. The silane solution consists of absolute ethyl alcohol, a silane coupling agent and distilled water, and the mass ratio of the components is as follows: 78:12:10, the particle size of the nano titanium dioxide D2 is as follows: 50nm, the mass fraction w1 of the nano titanium dioxide in the suspension is as follows: 15 percent of straw fiber is soaked in the suspension for t2Comprises the following steps: and (3) 30 min.
3.3 putting the nano titanium dioxide-straw fiber obtained in the step 3.2 into an ultrasonic cleaning machine for cleaning for t3Comprises the following steps: and 8min, wherein the ultrasonic cleaning temperature is room temperature, and the ultrasonic cleaning medium is distilled water. Then drying in a drying box, wherein the drying temperature T1 is as follows: drying at 112 deg.C for t4Comprises the following steps: and (3) 150min, and finally obtaining the nano titanium dioxide-straw fiber multi-scale reinforcement.
The preparation method of the copper-free NAO type brake pad for the high-end agricultural equipment comprises the following specific steps:
4.1 preparation of granules for friction material described in copper-free NAO type brake pads for high end agricultural equipment, comprising the steps of:
4.1.1 placing rubber powder, nitrile rubber modified phenolic resin, barite, shale, alumina, vermiculite powder, tire powder, purple sand, friction powder, potassium titanate platelets and copper powder as substitute materials in a three-dimensional moving mixer for full mixing, wherein the mixing time t5 is as follows: 3 min;
4.1.2 putting the mixed raw material obtained in the step 3.1.1 and the nano titanium dioxide-straw fiber multi-scale reinforcement into a paddle mixer for fully mixing for a mixing time t6Comprises the following steps: 1 min;
4.1.3 put the mixed raw materials obtained in step 4.1.2 into the granulator and carry out granulation processing, continuously spout bridging liquid into the granulation cylinder simultaneously, constantly adjust granulation cylinder and rotary cutter rotational speed and bridging liquid's injection quantity, after fully granulating, obtain the granulation thing, the rotational speed r1 of granulation cylinder is: 20 r/min; the rotating cutter rotating speed r2 is as follows: 70r/min, and the bridging liquid is 3 wt% of corn starch paste solution;
4.1.4 drying the granulated substance obtained in the step 4.1.3 in a drying box to obtain a final granulated substance, wherein the drying temperature T2 is as follows: drying at 100 ℃ for a drying time t7Comprises the following steps: for 100min, the obtained granulation was cell-like in shape, with a diameter D3: 1 mm.
4.2 the material mixing process flow in the brake block preparation process comprises the following steps:
4.2.1 putting the nitrile rubber modified phenolic resin and the non-straw fiber into a paddle type mixer for fully mixing for a mixing time t8Comprises the following steps: 20 min;
4.2.2 putting the mixture obtained in the step 4.2.1 and the granules obtained in the step 4.1.4 into a three-dimensional moving mixer for fully mixing for a mixing time t9Comprises the following steps: and 5min to obtain the final mixed material for preparing the brake pad.
4.3 die filling-hot pressing heat treatment-surface ablation-post processing molding, comprising the following steps:
4.3.1 putting the mixed material obtained in the step 4.2.2 into a special mould for a brake pad for agricultural machinery equipment, then carrying out hot pressing treatment, finally carrying out heat treatment, and cooling to room temperature;
4.3.2 carrying out surface ablation on the brake block sample block obtained in the step 4.3.1 in a pass-through ablation machine, and cooling to room temperature;
4.3.3, the surface of the ablation surface of the brake block sample block obtained in the step 4.3.2 is polished, then grinding and cutting are carried out, then paint spraying and baking are carried out, finally, an alarm or a fixer is installed, and finally the copper-free NAO type brake block for high-end agricultural equipment is obtained.
The friction material produced by the process method of the embodiment has the friction factor range of 0.339-0.406 and the wear rate of 0.15 multiplied by 10-7cm3/Nm～0.26×10-7cm3and/Nm, the brake noise and brake dust are obviously reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A copper-free NAO type brake pad for high-end agricultural equipment is characterized by comprising the following components in percentage by mass: 80-95% of a granulating material for a friction material, 0-10% of nitrile rubber modified phenolic resin and 2-15% of non-straw fibers; wherein the non-straw fibers comprise one of rock wool fibers, sepiolite fibers or composite mineral fibers.
2. The granulated substance of the copper-free NAO type brake pad for high-end agricultural equipment according to claim 1, wherein the granulated substance comprises the following components by mass: 5-20% of nano titanium dioxide-straw fiber multi-scale reinforcement, 1-5% of rubber powder, 5-20% of nitrile rubber modified phenolic resin, 5-21% of barite, 2-10% of shale, 5-24% of alumina, 1-3% of vermiculite powder, 1-5% of tire powder, 1-5% of purple sand, 1-5% of friction powder, 3-15% of potassium titanate platelets and 2-15% of copper powder substitute material.
3. The granulated substance as claimed in claim 2, wherein the nano titanium dioxide-straw fiber multi-scale reinforcement is composed of 20-70% of corn straw fiber and 30-80% of straw fiber by mass.
4. The granulated substance according to claim 2, wherein the copper powder substitute material is composed of 20 to 40 mass% of stainless steel grinding dust and 60 to 80 mass% of natural graphite.
5. The pelletization object of claim 2, wherein the preparation method of the nano titanium dioxide-straw fiber multi-scale reinforcement comprises the following steps:
the method comprises the following steps: crushing the collected straw skin in a crusher, and then screening the crushed straw fibers;
step two: soaking the straw fiber obtained in the step one in a grafting treatment device filled with a suspension formed by nano titanium dioxide and a silane solution to obtain nano titanium dioxide-straw fiber;
step three: and (3) putting the nano titanium dioxide-straw fiber obtained in the step two into an ultrasonic cleaning machine for cleaning, and then drying in a drying box to finally obtain the nano titanium dioxide-straw fiber multi-scale reinforcement.
6. The granulated substance according to claim 5, wherein in the first step, the straw skin is pulverized for a time t1Comprises the following steps: t is less than or equal to 3min1Less than or equal to 6 min; straw (stalk)The length L1 of the stalk fiber is as follows: l1 is more than or equal to 1mm and less than or equal to 3mm, and the fiber diameter D1 is as follows: d1 is more than or equal to 0.01mm and less than or equal to 0.5 mm;
in the second step, the silane solution consists of absolute ethyl alcohol, a silane coupling agent and distilled water, and the mass ratio of the components is as follows: 35-75: 6-15: 10-50, and the particle size of the nano titanium dioxide D2 is as follows: d2 is more than or equal to 2nm and less than or equal to 100nm, and the mass fraction w1 of the nano titanium dioxide in the suspension is as follows: w1 is more than or equal to 0.5 percent and less than or equal to 25 percent, and the straw fiber is soaked in the suspension for time t2Comprises the following steps: t is less than or equal to 10min2≤50min；
In the third step, the ultrasonic cleaning time t3 is as follows: t3 is more than or equal to 2min and less than or equal to 10 min; the ultrasonic cleaning temperature is room temperature; the ultrasonic cleaning medium is distilled water; the drying temperature T1 is as follows: t1 is more than or equal to 90 ℃ and less than or equal to 112 ℃, and the drying time T is T4Comprises the following steps: t4 is more than or equal to 60min and less than or equal to 180 min.
7. The method of manufacturing a copper-free NAO type brake pad of claim 2, comprising the steps of:
includes the preparation of granules for friction material;
mixing materials in the brake pad preparation process;
filling a mould, hot-pressing heat treatment, surface ablation, and post-processing molding.
8. The method of claim 7, wherein the preparing of the granules for the friction material comprises:
s1: rubber powder, nitrile rubber modified phenolic resin, barite, shale, alumina, vermiculite powder, tire powder, purple sand, friction powder, potassium titanate platelets and copper powder substitute materials are placed in a three-dimensional motion mixer to be fully mixed for mixing time t5Comprises the following steps: t is less than or equal to 3min5≤8min；
S2: and (3) putting the mixed raw material obtained in the step (S1) and the nano titanium dioxide-straw fiber multi-scale reinforcement into a paddle mixer for fully mixing, wherein the mixing time t6 is as follows: t is less than or equal to 1min6≤3min；
S3: putting the mixed raw material obtained in the step S2 into a granulator for granulation treatment, spraying bridging liquid into a granulation roller, adjusting the rotation speed of the granulation roller and a rotary cutter and the spraying amount of the bridging liquid, and fully granulating to obtain granules; the rotation speed r1 of the granulation roller is as follows: r1 is more than or equal to 20r/min and less than or equal to 350 r/min; the rotating cutter rotating speed r2 is as follows: r1 is more than or equal to 70r/min and less than or equal to 90r/min, and the bridging liquid is one of distilled water, absolute ethyl alcohol and corn starch paste solution with the mass fraction of 3 wt%;
s4: and (4) putting the granulated substance obtained in the step (S3) into a drying box for drying treatment to obtain a final granulated substance for the friction material, wherein the drying temperature T2 is as follows: t2 is more than or equal to 100 ℃ and less than or equal to 130 ℃, and the drying time T7 is as follows: t7 is more than or equal to 100min and less than or equal to 240min, the obtained granulation substance is in a cell-like shape, the diameter D3 is as follows: d3 is more than or equal to 1mm and less than or equal to 8 mm.
9. The method of claim 7, wherein the brake pad is prepared by a batch process comprising the steps of:
s1: the nitrile butadiene rubber modified phenolic resin and the non-straw fiber are put into a paddle mixer for full mixing for a mixing time t8Comprises the following steps: t is less than or equal to 5min8≤20min；
S2: putting the mixture obtained in the step S1 and the granulating material for the friction material into a three-dimensional motion mixer for fully mixing for a mixing time t9Comprises the following steps: t is less than or equal to 5min9The time is less than or equal to 10min, and the final mixed material for preparing the brake pad is obtained.
10. The method of making a copper-free brake pad of the NAO type of claim 7, wherein the mold packing-thermo-compression heat treatment-surface ablation-post-forming comprises the steps of:
s1: putting the mixed material for preparing the brake pad into a special mould for preparing the brake pad, then carrying out hot pressing treatment, finally carrying out heat treatment, and cooling to room temperature;
s2: carrying out surface ablation on the brake block sample block obtained in the step S1 in a pass-through ablation machine, and cooling to room temperature;
s3: and (5) polishing the surface of the ablation surface of the brake block sample block obtained in the step (S2), then carrying out grinding and cutting treatment, then carrying out paint spraying and baking treatment, and finally installing an alarm or a fixer to finally obtain the copper-free NAO type brake block.
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