CN1888004A - Fiber mixture reinforced friction material and its prepn - Google Patents
Fiber mixture reinforced friction material and its prepn Download PDFInfo
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- CN1888004A CN1888004A CN 200610200693 CN200610200693A CN1888004A CN 1888004 A CN1888004 A CN 1888004A CN 200610200693 CN200610200693 CN 200610200693 CN 200610200693 A CN200610200693 A CN 200610200693A CN 1888004 A CN1888004 A CN 1888004A
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Abstract
The present invention is one kind of fiber mixture reinforced friction material and its preparation process. The fiber mixture reinforced friction material is prepared with reinforcing fiber mixture comprising steel fiber 12-25 wt%, aramid fiber 16 wt%, needle shaped wollastonite 7-16 wt% and fibrous palygorskite 5-12 wt%, adhesive 17 wt% and filler 45 wt%. Compared with available technology, the fiber mixture reinforced friction material of the present invention has the advantages of improved wear resistance, less heat fading, raised impact strength, stable friction coefficient, less wear rate, moderate hardness, low cost and other advantages. It may be used to replace asbestos friction material.
Description
Technical field: the present invention relates to a kind of fiber mixture reinforced friction material and preparation method thereof, particularly fiber mixture reinforced friction material of fibrousness polygorskite and preparation method thereof belongs to the friction braking material technical field.
Background technology: along with transportation means such as automobile, train, aircraft to high-power, at a high speed, heavily loaded direction develops, and its comfort level and security requirement are improved constantly, the performance of tackling friction braking material has mutually also proposed harsh more requirement.In traditional friction materials manufacturing technology, asbestos are main enhancing ingredients of friction materials, but asbestos are generally acknowledged it has been carcinogenic substance, very harmful to human body, and asbestos dust also causes severe contamination to environment.Therefore, develop the important development trend that asbestos-free friction material becomes current friction materials.Divide from the moiety angle of asbestos-free friction material, friction materials can be divided into organic type and inorganic type two big classes.Studying at present and using more is the organic type friction materials, and no asbestos organic type friction materials can be divided into by the kind and the quantity of institute's fibre-bearing: natural and synthetic no asbestos fibre material, fiber mixture reinforced friction material, no fiber friction material.Assorted fibre is a physics-chem characteristic of taking all factors into consideration various fibers, utilizes the mechanism that mixes between the fiber, makes its performance reach the reinforced effects of asbestos in friction materials.Studies show that the over-all properties of existing any single fiber all can't be compared with asbestos, so fiber mixture reinforced friction material is an important directions of not having asbestos organic type Friction Materials now.
The US4 that U.S. Engelhard company obtained the authorization February 8 nineteen eighty-three, 373, No. 037 U.S. Patent Publication a kind of contain attapulgite (polygorskite) clay and and the asbestos-free friction material formed of steel fiber or other non-asbestos fibers, also comprise weighting material, lubricant and the wearing and tearing modifying agent etc. of routine in its component.The problem that the asbestos-free friction material of this patent disclosure exists is that the weight ratio scope of steel fiber in this friction materials is 10%～50%, too high levels, because steel fiber replaces fibrous magnesium silicate to exist than great as the fortifying fibre of friction materials, the hardness height, damage the shortcoming of mating plate easily, though and this patent is to propose for the first time attapulgite is used for asbestos-free friction material, but adopt attapulgite must carry out strict high-temperature heat treatment to it as the composition of asbestos-free friction material, make the weight ratio of the planar water of attapulgite be lower than 5%, on this basis CO in the carbonate
2Weight ratio be no more than 5%, cause production technique loaded down with trivial details.Chinese patent CN02119506.6 discloses a kind of asbestos-free friction material that adopts sepiolite fibre, vegetable fibre to replace asbestos, but charing takes place easily during the plant fibre high-temp that uses in this asbestos-free friction material friction, influences Properties of Friction Materials.Chinese patent CN97112643.7 discloses a kind of asbestos-free friction material that adopts hair fiber and steel fiber as fortifying fibre, and the data that provide from open file exist shock strength not ideal enough, and have the stable inadequately shortcoming of frictional coefficient.
The patent that the applicant has applied for to State Intellectual Property Office (application number: 200610200405.5), provide fibriform paligorskite application in the preparation brake liner material and products thereof and method for making.Through further experimental study, the applicant has obtained a kind of asbestos-free friction material prescription and moulding process of better fibrousness polygorskite.
Summary of the invention:
The objective of the invention is to: a kind of fiber mixture reinforced friction material and preparation method thereof is provided, the present invention is directed to the deficiencies in the prior art, adopt steel fiber (steel fiber), organic fibre (aramid fiber), mineral fibre (fibriform paligorskite, acicular wollastonite) as the assorted fibre component, having improved steel fiber easily gets rusty, thermal conduction is too fast, easily produce brake squeal and flutter, damage mating plate easily, goods are than great, the hardness height, aramid fiber price height, process of surface treatment complexity and mineral fibre intensity are on the weak side, crystal water was to the shortcomings such as detrimentally affect of material property when mineral fibre content was high, the stable friction factor of products obtained therefrom, wear rate is little, the shock strength height, hardness is moderate, price is low.
The present invention constitutes like this: calculate according to weight percent, it be the assorted fibre formed with steel fiber 12%～25%, aramid fiber 1%～6%, acicular wollastonite 7%～16% and fibriform paligorskite 5%～12% as fortifying fibre, in addition binding agent 17% and filler 45% are made again.
Say that exactly each component shared weight percent in friction materials is in the assorted fibre: steel fiber 15.41%, aramid fiber 2.73%, acicular wollastonite 12.53%, fibriform paligorskite 7.33%.
Described fibriform paligorskite is the mixture of the fibriform paligorskite of 24 orders and two kinds of granularities of 40 orders, and its mixed weight ratio is 3: 7.
Described fibriform paligorskite prepares like this: the raw ore polygorskite washed removed impurity and residue, and dry under 100 ℃ of temperature then, pulverize 1～3min with vibrating mill again, use the standard test screen sizing at last, promptly get the polygorskite of different meshes.
Used binding agent is 13% nbr modified phenolic resins and 4% rubber powder.
Used filler is ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, kyanite 2%, Al
2O
33%, chromite 4% and crystalline flake graphite 8%.
The preparation method of fiber mixture reinforced friction material of the present invention is: adopt the dry method preforming process, undertaken by following four steps:
(1) raw-material pre-treatment: various fibers and filler are placed in the baking oven in 120 ℃ of bakings 1 hour; Nbr modified phenolic resins is placed in the baking oven in 60～70 ℃ of bakings 0.5 hour.
(2) batch mixing: take by weighing aramid fiber and crystalline flake graphite and put into container hand mixing 2～3min, it is put in the stirrer under 1250r/min, stir 3～4min then, add other starting material at last and under 800r/min, stir 5min.In the batch mixing process, the rotating speed control of the reinforced order of aramid fiber, fibriform paligorskite, resin and various fillers, reinforced time and mixer is that batch mixing is even, particularly helps aramid fiber dispersive important factor.
(3) hot pressing: will mix completely raw material and put into mould, and under the condition of 160 ± 5 ℃ of press temperatures, pressing pressure 25 ± 3Mpa, heat-insulation pressure keeping time 60s/mm, carry out hot pressing; When beginning, hot pressing opens the die cavity exhaust 3～5 times every 10s.
(4) thermal treatment: at 20～100 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 100～120 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 120～140 ℃ of temperature sections, constant heatingrate 40min, insulation 140min; At 140～170 ℃ of temperature sections, constant heatingrate 30min, insulation 4h.
Compared with prior art, the present invention adopts steel fiber, organic fibre and mineral fibre are as the assorted fibre component, having improved steel fiber easily gets rusty, thermal conduction is too fast, easily produce brake squeal and flutter, damage mating plate easily, goods are than great, the hardness height, aramid fiber price height, process of surface treatment complexity and mineral fibre intensity are on the weak side, crystal water was to the shortcomings such as detrimentally affect of material property when mineral fibre content was high, the wear resistance of prepared friction materials, character of heat-fading, indexs such as shock strength all meet and are better than national standard, and stable friction factor, wear rate is little, hardness is moderate, price is lower, makes alternative fully asbestos friction material become possibility.
Embodiment:
Embodiment 1: aramid fiber 2.73%, steel fiber 15.41%, acicular wollastonite 12.53%, fibriform paligorskite 7.33%, nbr modified phenolic resins 13%, rubber powder 4%, ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, Al
2O
33%, kyanite 2%, chromite 4%, crystalline flake graphite 8%.
Take by weighing various raw materials by above-mentioned part by weight, adopt the dry method preforming process, prepare by following four steps:
(1) raw-material pre-treatment: various fibers and filler are placed in the baking oven in 120 ℃ of bakings 1 hour; Nbr modified phenolic resins is placed in the baking oven in 60～70 ℃ of bakings 0.5 hour.
(2) batch mixing: take by weighing aramid fiber and crystalline flake graphite and put into container hand mixing 2～3min, it is put in the stirrer under 1250r/min, stir 3～4min then, add other starting material at last and under 800r/min, stir 5min.
In the batch mixing process, the rotating speed control of the reinforced order of aramid fiber, fibriform paligorskite, resin and various fillers, reinforced time and mixer is that batch mixing is even, particularly helps aramid fiber dispersive important factor.Aforesaid operations can guarantee that aramid fiber good dispersion, batch mixing are even.
(3) hot pressing: will mix completely raw material and put into mould, and under the condition of 160 ± 5 ℃ of press temperatures, pressing pressure 25 ± 3Mpa, heat-insulation pressure keeping time 60s/mm, carry out hot pressing; When beginning, hot pressing opens the die cavity exhaust 3～5 times every 10s.
(4) thermal treatment: at 20～100 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 100～120 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 120～140 ℃ of temperature sections, constant heatingrate 40min, insulation 140min; At 140～170 ℃ of temperature sections, constant heatingrate 30min, insulation 4h.
Embodiment 2: aramid fiber 3%, steel fiber 14%, acicular wollastonite fiber 9%, fibriform paligorskite 12%, nbr modified phenolic resins 13%, rubber powder 4%, ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, Al
2O
33%, kyanite 2%, chromite 4%, crystalline flake graphite 8%.
Take by weighing various raw materials by above-mentioned part by weight, with embodiment 1 described processing step preparation.
Embodiment 3: aramid fiber 1%, steel fiber 25%, acicular wollastonite 7%, fibriform paligorskite 5%, nbr modified phenolic resins 13%, rubber powder 4%, ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, Al
2O
33%, kyanite 2%, chromite 4%, crystalline flake graphite 8%.
Take by weighing various raw materials by above-mentioned part by weight, with embodiment 1 described processing step preparation.
Embodiment 4: aramid fiber 1%, steel fiber 12%, acicular wollastonite 16%, fibriform paligorskite 9%, nbr modified phenolic resins 13%, rubber powder 4%, ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, Al
2O
33%, kyanite 2%, chromite 4%, crystalline flake graphite 8%.
Take by weighing various raw materials by above-mentioned part by weight, with embodiment 1 described processing step preparation.
Embodiment 5: aramid fiber 6%, steel fiber 16%, acicular wollastonite 10%, fibriform paligorskite 6%, nbr modified phenolic resins 13%, rubber powder 4%, ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, Al
2O
33%, kyanite 2%, chromite 4%, crystalline flake graphite 8%.
Take by weighing various raw materials by above-mentioned part by weight, with embodiment 1 described processing step preparation.
Friction materials of the present invention is with reference to GB5763-1998, GBn257-1986 regulation adopts the middle specified test of GB5763-1998 " automobile brake facing " that the friction and wear behavior of the friction materials of the prescription manufacturing that provided according to embodiment 1 to embodiment 5 is tested; With reference to the GB5765-1986 method, the shock strength of the friction materials of the prescription manufacturing that embodiment 1 to embodiment 5 is provided is tested.
The requirement of table 1GB5763-1998 frictional behaviour
| Project | Test temperature * 1 | |||||
| 100 ℃ | 150 ℃ | 200 ℃ | 250 ℃ | 300 ℃ | 350 ℃ | |
| Frictional coefficient * 2(μ) | 0.25～0.65 | 0.25～0.70 | 0.25～0.70 | 0.25～0.70 | 0.25～0.70 | 0.20～0.70 |
| Specify frictional coefficient * 3Permissible variation Δ μ | ± 0.08 | ± 0.10 | ± 0.12 | ± 0.12 | ± 0.14 | ± 0.14 |
| Wear rate (v) 10 -7Cm 3/ (Nm)≤ | 0.50 | 0.70 | 1.00 | 1.50 | 2.50 | 3.50 |
| * 1Test temperature finger to finger test machine disk friction surface temperature. * 2Range of friction coefficients comprises permissible variation. * 3Specify frictional coefficient to decide through consultation by both sides of supply and demand. | ||||||
Being defined as the shock strength of friction materials among the GBn257-1986: shock strength should 〉=2.94KJ/m
2
The XJJ-50 type shock-testing machine that adopts XD-MSM type constant speed formula frictional testing machines that Xianyang new beneficial friction sealed material installation institute produces and Chengde trier factory to produce, friction and wear behavior and shock strength to the friction materials of the prescription manufacturing that provided according to embodiment 1 to embodiment 5 are tested, and the result is shown in table 2, table 3.
Table 2 friction and wear behavior
| Formula number | Coefficientoffriction | Wear rate V (* 10 -7cm 3/N·m) | |||||||||||
| Temperature T (℃) | Temperature T (℃) | ||||||||||||
| 100 | 150 | 200 | 250 | 300 | 350 | 100 | 150 | 200 | 250 | 300 | 350 | ||
| Embodiment 4 | Heat up | 0.53 | 0.49 | 0.46 | 0.42 | 0.41 | 0.36 | 0.18 | 0.21 | 0.41 | 0.58 | 0.90 | 0.84 |
| Cooling | 0.50 | 0.50 | 0.45 | 0.40 | 0.41 | -- | |||||||
| Embodiment 3 | Heat up | 0.46 | 0.50 | 0.40 | 0.36 | 0.40 | 0.35 | 0.12 | 0.18 | 0.53 | 0.67 | 0.92 | 1.33 |
| Cooling | 0.42 | 0.46 | 0.52 | 0.57 | 0.54 | -- | |||||||
| Embodiment 2 | Heat up | 0.50 | 0.50 | 0.45 | 0.37 | 0.39 | 0.35 | 0.23 | 0.18 | 0.36 | 0.61 | 0.67 | 0.92 |
| Cooling | 0.46 | 0.46 | 0.42 | 0.42 | 0.42 | -- | |||||||
| Embodiment 5 | Heat up | 0.48 | 0.50 | 0.47 | 0.41 | 0.36 | 0.37 | 0.21 | 0.21 | 0.33 | 0.55 | 0.74 | 0.93 |
| Cooling | 0.45 | 0.45 | 0.43 | 0.44 | 0.45 | -- | |||||||
| Embodiment 1 | Heat up | 0.48 | 0.48 | 0.43 | 0.43 | 0.44 | 0.38 | 0.17 | 0.38 | 0.61 | 0.74 | 0.93 | 1.47 |
| Cooling | 0.48 | 0.47 | 0.42 | 0.43 | 0.45 | -- | |||||||
Table 3 shock strength
| Numbering | Embodiment 5 | Embodiment 4 | Embodiment 3 | Embodiment 2 | Embodiment 1 |
| Shock strength (KJ/m 2) | 6.22 | 5.93 | 6.47 | 5.80 | 6.41 |
Detected result from table 2, table 3 as seen, performance index such as the wear resistance of the fiber mixture reinforced friction material of the prepared fibrousness polygorskite of the present invention, character of heat-fading, shock strength all meet and are better than national standard.
Claims (7)
1. fiber mixture reinforced friction material, it is characterized in that: calculate according to weight percent, it be the assorted fibre formed with steel fiber 12%～25%, aramid fiber 1%～6%, acicular wollastonite 7%～16% and fibriform paligorskite 5%～12% as fortifying fibre, in addition binding agent 17% and filler 45% are made again.
2. according to the described fiber mixture reinforced friction material of claim 1, it is characterized in that: each component shared weight percent in friction materials is in the assorted fibre: steel fiber 15.41%, aramid fiber 2.73%, acicular wollastonite 12.53%, fibriform paligorskite 7.33%.
3. according to claim 1 or 2 described fiber mixture reinforced friction materials, it is characterized in that: described fibriform paligorskite is the mixture of the fibriform paligorskite of 24 orders and two kinds of granularities of 40 orders, and its mixed weight ratio is 3: 7.
4. according to the described fiber mixture reinforced friction material of claim 3, it is characterized in that: described fibriform paligorskite prepares like this: the raw ore polygorskite is washed removed impurity and residue, dry under 100 ℃ of temperature then, pulverize 1～3min with vibrating mill again, use the standard test screen sizing at last, promptly get the polygorskite of different meshes.
5. according to the described fiber mixture reinforced friction material of claim 1, it is characterized in that: used binding agent is 13% nbr modified phenolic resins and 4% rubber powder.
6. according to the described fiber mixture reinforced friction material of claim 1, it is characterized in that: used filler is ground barium sulfate 15%, mica 5%, vermiculite 5%, potassium felspar sand 3%, kyanite 2%, Al2O33%, chromite 4% and crystalline flake graphite 8%.
7. as the preparation method of claim 1,5 or 6 described fiber mixture reinforced friction materials, it is characterized in that: be used in the method preforming process, undertaken by following four steps:
(1) raw-material pre-treatment: various fibers and filler are placed in the baking oven in 120 ℃ of bakings 1 hour; Nbr modified phenolic resins is placed in the baking oven in 60～70 ℃ of bakings 0.5 hour;
(2) batch mixing: take by weighing aramid fiber and crystalline flake graphite and put into container hand mixing 2～3min, it is put in the stirrer under 1250r/min, stir 3～4min then, add other starting material at last and under 800r/min, stir 5min;
(3) hot pressing: will mix completely raw material and put into mould, and under the condition of 160 ± 5 ℃ of press temperatures, pressing pressure 25 ± 3Mpa, heat-insulation pressure keeping time 60s/mm, carry out hot pressing; When beginning, hot pressing opens the die cavity exhaust 3～5 times every 10s;
(4) thermal treatment: at 20～100 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 100～120 ℃ of temperature sections, constant heatingrate 1h, insulation 1h; At 120～140 ℃ of temperature sections, constant heatingrate 40min, insulation 140min; At 140～170 ℃ of temperature sections, constant heatingrate 30min, insulation 4h.
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|---|---|---|---|
| CNB2006102006934A CN100420727C (en) | 2006-07-17 | 2006-07-17 | Fiber mixture reinforced friction material and its prepn |
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| CN100420727C CN100420727C (en) | 2008-09-24 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148330B (en) * | 2007-09-06 | 2011-08-31 | 贵州大学 | Modified method for fibriform paligorskite and its product and application |
| CN102533221A (en) * | 2011-12-30 | 2012-07-04 | 珠海格莱利摩擦材料有限公司 | Disc-type friction material and manufacturing method thereof |
| CN102583994A (en) * | 2012-01-18 | 2012-07-18 | 大连环球矿产有限公司 | Composite mineral fiber and preparation method 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 |
| CN105400492A (en) * | 2015-11-28 | 2016-03-16 | 武汉元丰摩擦材料有限公司 | Pure electric bus friction material and preparation method thereof |
| CN107189758A (en) * | 2017-06-11 | 2017-09-22 | 太仓捷公精密金属材料有限公司 | A kind of fiber mixture reinforced friction material and preparation method thereof |
| CN107254294A (en) * | 2017-08-17 | 2017-10-17 | 苏州飞伦利斯金属科技有限公司 | A kind of fiber mixture reinforced friction material 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 |
| CN114763300A (en) * | 2021-05-20 | 2022-07-19 | 国风塑业科技宿迁有限公司 | Heat-conducting wear-resistant composite material for railway noise-reduction brake beam and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373037A (en) * | 1981-05-29 | 1983-02-08 | Engelhard Corporation | Asbestos-free friction material incorporating attapulgite clay |
| CN1258050C (en) * | 2004-04-08 | 2006-05-31 | 广西科学院应用物理研究所 | Automotiv non-asbestos high strength braking friction disk, and its prodn. method |
| CN1332141C (en) * | 2005-03-09 | 2007-08-15 | 中信重型机械公司 | Method for preparing disc-brake shoe of mine hoist |
-
2006
- 2006-07-17 CN CNB2006102006934A patent/CN100420727C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148330B (en) * | 2007-09-06 | 2011-08-31 | 贵州大学 | Modified method for fibriform paligorskite and its product and application |
| CN102533221A (en) * | 2011-12-30 | 2012-07-04 | 珠海格莱利摩擦材料有限公司 | Disc-type friction material and manufacturing method thereof |
| CN102533221B (en) * | 2011-12-30 | 2014-03-12 | 珠海格莱利摩擦材料有限公司 | Disc-type friction material and manufacturing method thereof |
| CN102583994A (en) * | 2012-01-18 | 2012-07-18 | 大连环球矿产有限公司 | Composite mineral fiber and preparation method thereof |
| CN102583994B (en) * | 2012-01-18 | 2014-07-23 | 大连环球矿产有限公司 | Composite mineral fiber and preparation method 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 |
| CN105400492A (en) * | 2015-11-28 | 2016-03-16 | 武汉元丰摩擦材料有限公司 | Pure electric bus friction material and preparation method thereof |
| CN107189758A (en) * | 2017-06-11 | 2017-09-22 | 太仓捷公精密金属材料有限公司 | A kind of fiber mixture reinforced friction material and preparation method thereof |
| CN107254294A (en) * | 2017-08-17 | 2017-10-17 | 苏州飞伦利斯金属科技有限公司 | A kind of fiber mixture reinforced friction material 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 |
| CN114763300A (en) * | 2021-05-20 | 2022-07-19 | 国风塑业科技宿迁有限公司 | Heat-conducting wear-resistant composite material for railway noise-reduction brake beam and preparation method thereof |
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Assignee: Shandong Double Link Brake Material Co., Ltd. Assignor: Guizhou University Contract record no.: 2011370000303 Denomination of invention: Fiber mixture reinforced friction material and its prepn Granted publication date: 20080924 License type: Exclusive License Open date: 20070103 Record date: 20110705 |
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