CN103059808A - Low-fading-rate NAO friction material and preparation method thereof - Google Patents
Low-fading-rate NAO friction material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-fading-rate NAO friction material and a preparation method thereof. The low-fading-rate NAO friction material has the characteristics of low cost, stable friction factor, low fading rate at high temperature, favorable restorability, low wear rate, high inner shear strength, small specific gravity and moderate hardness. The low-fading-rate NAO friction material disclosed by the invention is prepared from the following raw materials in parts by weight: 3-8 parts of resin, 2-6 parts of friction powder, 1-3 parts of butadiene-acrylonitrile rubber powder, 2-5 parts of tire powder, 20-22 parts of fiber and 63-68 parts of filler. The preparation method comprises the following steps: (1) mixing: weighing all raw materials according to the formula, putting into a high-speed mixer, and stirring for 2 minutes; (2) pre-pressure forming: putting the mixture into a cold-press mold, and carrying out pressure forming to obtain a cold blank; (3) hot pressing: putting the cold blank into a mold, and pressing; and (4) heat treatment: carrying out heat treatment in an oven, heating to 200 DEG C from room temperature, and baking for 4-16 hours.
Description
Technical field
A kind of low fading rate NAO friction materials and preparation method thereof.
Background technology
Along with the transport facilitys such as automobile, train, aircraft at a high speed, heavily loaded future development; people are to improving constantly that security, comfortableness and spatter property require; to healthy and reinforcement environmental protection consciousness; not only harsher to the braking ability requirement of friction materials, and stricter to Material selection.Because asbestos have excellent performance and cheap cost, early stage friction materials mainly is as strongthener with asbestos, but increasing data proves, asbestos are very harmful to the people's, being recognized is carcinogenic substance, and asbestos dust causes severe contamination to environment in production and use procedure.Mandatory national standards GB12676-1999 also stipulates: China's brake lining from 1 day October in 2003 should not contain asbestos.And along with the development of friction materials, the semi-metal and the low friction metal material that strengthen with steel wool can solve at a high speed and heavily loaded problem preferably, because steel wool has good temperature tolerance and heat conductivity, can overcome in brake process kinetic transformation and be the braking quality decline that temperature rise that heat energy produces causes, guarantee stable braking ability,, steel wool makes semi-metal and low friction metal material but replacing asbestos because than great, hardness is high, easily corrosion, the damage antithesis, produce brake noise and vibration, the dust that brake produces easily pollutes the shortcomings such as wheel hub, also makes people feel dissatisfied.The develop of mineral fibre, mineral fibre is applied in to develop in the friction materials without asbestos becomes new developing direction without the NAO material friction materials that steel wool can add with a small amount of copper or aluminium.
Studies show that, vehicle is in braking procedure, and whole breaking system need to be born huge pressure.An intermediate-size car is braked the instantaneous braking power that needs to surpass 500KW when speed per hour 130KM.The output rating of supposing car is 50KW, and instantaneous braking power is more than 10 times of engine output so.Simultaneously, during braking the temperature of brake facing and brake flange can rise 300～400 the degree, if continuously the braking or lower long slope, the temperature of friction pair can rise to 500～600 the degree, surface temperature is higher.Superpolymer in the friction materials presents plasticity and elasticity and produces adhesion and distortion below decomposition temperature.More than decomposition temperature, superpolymer is decomposed into gas and low-molecular material, and mixed friction occurs, and produces decline.After heat fading referred to that the brake facing temperature rises, the phenomenon that its braking effect goes down even lost efficacy significantly felt to be exactly that the pin that brakes is soft, and the effect that how to touch on the brake again is also not obvious.For the friction materials of NAO material, since the minimizing of metal content own, the thermal conductivity variation, and heat is Quick diffusing effectively, easily causes decline; Owing to having used organic fibre, the organic fibre resistance to elevated temperatures is poor, the easy decline of high temperature self on the other hand.Therefore, how solving high temperature decline problem is to develop the key of the NAO prescription of excellent performance.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and low, restorative good, wear rate is little, interior shearing resistance is high, material proportion is little and hardness is moderate NAO friction materials of decline under a kind of with low cost, stable friction factor, the high temperature and preparation method thereof is provided.
The technical solution adopted in the present invention is: the starting material that the present invention includes following weight part are made: 63～68 parts of 3～8 parts of resins, friction 2～6 parts in powder, 1～3 part of nitrile rubber powder, 2～5 parts of tyre talcs, 20～22 parts of fibers and fillers, described fiber comprises aramid fiber, silicate mineral fiber and brass fiber.
Preferably, described filler comprises barite, zirconium silicate, brown corundum, fluorochemical, red vermiculite, sulphur, calcium oxide, synthetic graphite, natural flake graphite and calcined petroleum coke.Described filler is used for adjusting the properties of friction materials, arrives the effect of adjusting by the consumption of controlling each material.
Preferably, described fiber comprises 5～7 parts of 1～2 part of aramid fiber, 13～15 parts of silicate mineral fibers and brass fibers.
Preferably, described filler comprises 4～6 parts of 26～28 parts in barite, 2～4 parts of zirconium silicates, 1～2 part in brown corundum, 5～7 parts in fluorochemical, 4～6 parts of red vermiculites, 1～2 part in sulphur, 1～2 part in calcium oxide, 9～11 parts of synthetic graphites, 4～6 parts of natural flake graphites and calcined petroleum coke.
The preparation method of a kind of low fading rate NAO friction materials of the present invention, the method is carried out according to the following steps:
(1) batch mixing: take by weighing all raw material by formulation weight part, all material is put into high speed mixer stir, make friction materials and puddle material;
(2) hot pressing: puddle material and put into mould, die temperature is controlled at 150 ± 5 ℃, pressing pressure 30 ± 2MPa, heat-insulation pressure keeping time and carries out hot pressing under the condition of 30s/mm, ranked first time gas behind the pressurize 15s, each exhaust residence time is 5s, later on every 10s breathing a mould 3～5 times;
(3) thermal treatment: from room temperature～140 ℃, constant heatingrate 1～2h, insulation 2～4h, from 140 ℃～160 ℃, constant heatingrate 1～2h, insulation 2～4h, from 160 ℃～180 ℃, constant heatingrate 1～2h, insulation 2～4h, 180 ℃～200 ℃, constant heatingrate 1～2h, insulation 2～4h cools to below 120 ℃ again, takes out product after naturally cooling to room temperature.
Preferably, carrying out step (2) before, first pre-molding is put into mixed material in the preforming tool, adopts 400～500kg/cm
2Pressure forming is cold base, colder base is put into mould and suppresses.
The invention has the beneficial effects as follows: because the starting material that the present invention includes following weight part mix: the starting material that comprise following weight part are made: 63～68 parts of 3～8 parts of resins, 2～6 parts in powder of friction, 1～3 part of nitrile rubber powder, 2～5 parts of tyre talcs, 20～22 parts of fibers and fillers, described fiber comprises aramid fiber, silicate mineral fiber, brass fiber, and described filler comprises barite, zirconium silicate, brown corundum, fluorochemical, red vermiculite, sulphur, calcium oxide, synthetic graphite, natural flake graphite, calcined petroleum coke; Compared with prior art, the present invention strictly controls organic consumption in the NAO recipe ingredient, and material is specially the consumption of resin, friction powder, rubber powder, tyre talc, reduces the heat fading of NAO material friction materials.Described resin plays bonding effect in whole prescription, because resin thermolysis under the high temperature produces gas and can form air-cushion film, reduced frictional coefficient simultaneously; Described fiber has good enhancement, the shock-resistant and anti-shear ability of friction materials when satisfying high temperature; Described filler is used for adjusting the properties of friction materials.Through prescription research and development, performance test and service testing, the stable friction factor of products obtained therefrom, high temperature fading rate extremely low, restorative good, wear rate is little, interior shearing resistance is high, material proportion is little, hardness is moderate, cost is not high, also solved better the heat fading problem that NAO material friction materials is difficult to overcome, satisfy the brake request of vehicle, realized simultaneously friction materials without asbestos.
Embodiment
The present invention mainly is the heat fading problem that will solve friction materials, from the composition of friction materials, organism is to cause the major cause that fails, strictly controls organic consumption, reduce the amounts of components that brings about its decline, reaching the reduction decline is important research direction.The below provides specific embodiments of the invention to the detailed description of the invention.
A kind of low fading rate NAO friction materials of the present invention comprises that the starting material of following weight part make: 3～8 parts of resins, 2～6 parts in friction powder, 1～3 part of nitrile rubber powder, 2～5 parts of tyre talcs, 1～2 part of aramid fiber, 13～15 parts of silicate mineral fibers, 5～7 parts of brass fibers, 26～28 parts in barite, 2～4 parts of zirconium silicates, 1～2 part in palm fibre corundum, 5～7 parts in fluorochemical, 4～6 parts of red vermiculites, 1～2 part in sulphur, 1～2 part in calcium oxide, 9～11 parts of synthetic graphites, 4～6 parts of 4～6 parts of natural flake graphites and calcined petroleum coke, described resin can adopt resin material commonly used in the field, and the preferred resol of the present invention.
The preparation method who the present invention relates to may further comprise the steps:
(1) batch mixing: take by weighing all raw material by formulation weight part, all raw material is put into high speed mixer, stirred 2～5 minutes, make friction materials and puddle material;
(2) pre-molding: mixed material is put in the preforming tool, adopted 400～500kg/cm
2Pressure forming is cold base, colder base is put into mould and suppresses;
(3) hot pressing: puddle material and put into mould, die temperature is controlled at 150 ± 5 ℃, pressing pressure 30 ± 2MPa, heat-insulation pressure keeping time and carries out hot pressing under the condition of 30s/mm, ranked first time gas behind the pressurize 15s, each exhaust residence time is 5s, later on every 10s breathing a mould 3～5 times;
(4) thermal treatment: from room temperature～140 ℃, constant heatingrate 1～2h, insulation 2～4h, from 140 ℃～160 ℃, constant heatingrate 1～2h, insulation 2～4h, from 160 ℃～180 ℃, constant heatingrate 1～2h, insulation 2～4h, 180 ℃～200 ℃, constant heatingrate 1～2h, insulation 2～4h cools to below 120 ℃ again, takes out product after naturally cooling to room temperature.
By the above-mentioned formula for raw stock that provides and preparation method, just can make low fading rate NAO friction materials.
The below exemplifies several specific embodiments and describes.Friction materials of the present invention is with reference to GB5763-2008, and the friction materials of the prescription manufacturing that the following several embodiment of the testing method of regulation contrast provide among the employing GB5763-2008 " brake spacer for automobile " carries out friction and wear test.Frictional behaviour requires to see Table 1.
The requirement of table 1 GB5763-2008 frictional behaviour
Embodiment 1: 5 parts of resins, 4 parts in powder of friction, 2 parts of nitrile rubber powders, 3 parts of tyre talcs, 5 parts of 1 part of aramid fiber, 14 parts of silicate mineral fibers, 7 parts of brass fibers, 27 parts in barite, 3 parts of zirconium silicates, 1 part in brown corundum, 6 parts in fluorochemical, 5 parts of red vermiculites, 1 part in sulphur, 1 part in calcium oxide, 10 parts of synthetic graphites, 5 parts of natural flake graphites and calcined petroleum coke, carry out batch mixing, compacting, the prepared material of thermal treatment by above-mentioned preparation method and carry out friction and wear test, test result is as shown in table 2.
Embodiment 2: 3 parts of resins, 6 parts in powder of friction, 1 part of nitrile rubber powder, 5 parts of tyre talcs, 6 parts of 1 part of aramid fiber, 13 parts of silicate mineral fibers, 6 parts of brass fibers, 28 parts in barite, 2 parts of zirconium silicates, 2 parts in brown corundum, 5 parts in fluorochemical, 4 parts of red vermiculites, 1 part in sulphur, 2 parts in calcium oxide, 9 parts of synthetic graphites, 4 parts of natural flake graphites and calcined petroleum coke, carry out batch mixing, compacting, the prepared material of thermal treatment by above-mentioned preparation method and carry out friction and wear test, test result is as shown in table 2.
Embodiment 3: 8 parts of resins, 2 parts in powder of friction, 3 parts of nitrile rubber powders, 2 parts of tyre talcs, 4 parts of 2 parts of aramid fibers, 15 parts of silicate mineral fibers, 5 parts of brass fibers, 26 parts in barite, 4 parts of zirconium silicates, 1 part in brown corundum, 7 parts in fluorochemical, 6 parts of red vermiculites, 2 parts in sulphur, 1 part in calcium oxide, 11 parts of synthetic graphites, 6 parts of natural flake graphites and calcined petroleum coke, carry out batch mixing, compacting, the prepared material of thermal treatment by above-mentioned preparation method and carry out friction and wear test, test result is as shown in table 2.
Each embodiment friction and wear behavior test result of table 2
From the friction and wear test result of above three embodiment, because the organic consumption of strict control, along with temperature raises, frictional coefficient is very steady, almost not decline, and after temperature reduces, the frictional coefficient fine recovery of getting back.And the wear rate of each temperature section changes little, well below the GB requirement.The stable friction factor of the prepared NAO friction materials of the present invention, wear rate is little, fails low especially, has greatly improved friction and wear behavior.
Claims (6)
1. one kind low fading rate NAO friction materials, it is characterized in that: the starting material that comprise following weight part are made: 63～68 parts of 3～8 parts of resins, friction 2～6 parts in powder, 1～3 part of nitrile rubber powder, 2～5 parts of tyre talcs, 20～22 parts of fibers and fillers, described fiber comprises aramid fiber, silicate mineral fiber and brass fiber.
2. a kind of low fading rate NAO friction materials according to claim 1, it is characterized in that: described filler comprises barite, zirconium silicate, brown corundum, fluorochemical, red vermiculite, sulphur, calcium oxide, synthetic graphite, natural flake graphite and calcined petroleum coke.
3. a kind of low fading rate NAO friction materials according to claim 1 and 2 is characterized in that: described fiber comprises 5～7 parts of 1～2 part of aramid fiber, 13～15 parts of silicate mineral fibers and brass fibers.
4. a kind of low fading rate NAO friction materials according to claim 2 is characterized in that: described filler comprises 4～6 parts of 26～28 parts in barite, 2～4 parts of zirconium silicates, 1～2 part in brown corundum, 5～7 parts in fluorochemical, 4～6 parts of red vermiculites, 1～2 part in sulphur, 1～2 part in calcium oxide, 9～11 parts of synthetic graphites, 4～6 parts of natural flake graphites and calcined petroleum coke.
5. the preparation method of an a kind of low fading rate NAO friction materials as claimed in claim 1 is characterized in that: carry out according to the following steps:
(1) batch mixing: take by weighing all raw material by formulation weight part, all raw material is put into high speed mixer stir, make friction materials and puddle material;
(2) hot pressing: puddle material and put into mould, die temperature is controlled at 150 ± 5 ℃, pressing pressure 30 ± 2MPa, heat-insulation pressure keeping time and carries out hot pressing under the condition of 30s/mm, ranked first time gas behind the pressurize 15s, each exhaust residence time is 5s, later on every 10s breathing a mould 3～5 times;
(3) thermal treatment: from room temperature～140 ℃, constant heatingrate 1～2h, insulation 2～4h, from 140 ℃～160 ℃, constant heatingrate 1～2h, insulation 2～4h, from 160 ℃～180 ℃, constant heatingrate 1～2h, insulation 2～4h, 180 ℃～200 ℃, constant heatingrate 1～2h, insulation 2～4h cools to below 120 ℃ again, takes out product after naturally cooling to room temperature.
6. the preparation method of a kind of low fading rate NAO friction materials according to claim 5, it is characterized in that: carrying out step (2) before, first pre-molding is put into mixed material in the preforming tool, adopts 400～500kg/cm
2Pressure forming is cold base, colder base is put into mould and suppresses.
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| CN103756639A (en) * | 2014-01-26 | 2014-04-30 | 珠海格莱利摩擦材料有限公司 | Friction material used for motor brake and preparation method thereof |
| CN104789189A (en) * | 2015-03-20 | 2015-07-22 | 四川理工学院 | Disc brake pad friction material and preparation process thereof |
| CN104946200A (en) * | 2014-03-28 | 2015-09-30 | 广西民族大学 | Asbestos-free friction material for electromobile/motorcycle brake pads and preparation method thereof |
| CN105570359A (en) * | 2015-12-17 | 2016-05-11 | 珠海格莱利摩擦材料有限公司 | Friction material for drum brake of nine-seat passenger vehicle and preparation method of drum brake block |
| CN105570360A (en) * | 2015-12-17 | 2016-05-11 | 珠海格莱利摩擦材料有限公司 | Friction material for disc brake of nine-seat passenger vehicle and preparation method of disc brake block |
| CN105864331A (en) * | 2016-06-01 | 2016-08-17 | 江苏金麦穗新能源科技股份有限公司 | Production process of brake pad friction material adopting construction waste fillers |
| CN108240407A (en) * | 2017-12-29 | 2018-07-03 | 珠海格莱利摩擦材料有限公司 | High-effect brake lining friction material of rail traffic vehicles and preparation method thereof |
| CN108916279A (en) * | 2018-09-27 | 2018-11-30 | 重庆交通大学 | A kind of low resin-matrix friction material and preparation method thereof |
| CN112762119A (en) * | 2020-12-22 | 2021-05-07 | 中山市赛福特汽车配件有限公司 | Preparation method of brake pad with good heat fading resistance effect |
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| CN105864331A (en) * | 2016-06-01 | 2016-08-17 | 江苏金麦穗新能源科技股份有限公司 | Production process of brake pad friction material adopting construction waste fillers |
| CN108240407A (en) * | 2017-12-29 | 2018-07-03 | 珠海格莱利摩擦材料有限公司 | High-effect brake lining friction material of rail traffic vehicles and preparation method thereof |
| CN108916279A (en) * | 2018-09-27 | 2018-11-30 | 重庆交通大学 | A kind of low resin-matrix friction material and preparation method thereof |
| CN112762119A (en) * | 2020-12-22 | 2021-05-07 | 中山市赛福特汽车配件有限公司 | Preparation method of brake pad with good heat fading resistance effect |
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Effective date of registration: 20151223 Address after: 519041 Guangdong province Zhuhai City Sanzao town Jinwan District Jinhu Road No. 53 Patentee after: ZHUHAI HUALAI AUTO PART CO., LTD. Address before: 519041 Guangdong province Zhuhai City Sanzao town Jinwan District Jinhu Road No. 53 Patentee before: Zhuhai Glory Auto Components Co.,Ltd. |