CN1027989C - Asbestos-free friction material - Google Patents
Asbestos-free friction material Download PDFInfo
- Publication number
- CN1027989C CN1027989C CN 92103534 CN92103534A CN1027989C CN 1027989 C CN1027989 C CN 1027989C CN 92103534 CN92103534 CN 92103534 CN 92103534 A CN92103534 A CN 92103534A CN 1027989 C CN1027989 C CN 1027989C
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- China
- Prior art keywords
- friction material
- friction
- modified
- glass fibre
- phenol
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Abstract
The present invention provides an asbestos-free friction material which uses modified vinylon fibers and glass fibers as framework materials, and uses modified phenolic resin as an adhesive agent, and a friction regulating agent is added. The friction material can not be rusted, and the thermoconductivity is low. When the friction material is braked, noise does not be generated, and the environment can not be polluted in a manufacture process and a braking process. The present invention has the advantages of favorable temperature resistance performance, high friction coefficient, low wear rate, high impact resistance strength, etc. The friction material is suitable for being made into brake linings and dry clutch surface sheets of industrial machinery, and is also suitable for being made into clutch surface sheets of agricultural machinery. The friction material is especially suitable for being made into brake linings of boring machinery and surface sheets of a pneumatic tyre type clutch.
Description
The invention belongs to a kind of part material of braking control system, particularly a kind of employing modified vinylon fiber (chemical name modified polyvinyl alcohol fabric) and mixture of glass fibers are framework material, and the industrial machinery of making tackiness agent and adding friction modifier with phenol-formaldehyde resin modified is with the friction material that does not contain asbestos.
Adopted asbestos to make the friction material of raw material in the past,, caused the pollution of environment owing in the friction of manufacturing process and braking, produce dispersing of asbestos powder.Asbestos material has been identified the insulting health of meeting, and some developed countries have begun to forbid asbestos product production and use, and China has also determined strict asbestos content control criterion to environment.Therefore, the friction material of seeking not contain asbestos has become the producer and user's an urgent demand, and what develop under this background is that the asbestos-free friction material of body material is exactly a kind of new-type friction material (Chinese patent application discloses 88105119.5) that replaces asbestos with the iron-based original ore powder.But there is following defective in this material: cause reduction in strength wearing and tearing aggravation after the material corrosion because the iron content friction material gets rusty easily, simultaneously because metal fever conductivity height, fricative heat is passed rapidly to break, cause the softening and brake fluid generation vapour lock of seal ring, thereby cause brake failure; Because the ratio of this material is great, the rotary inertia that influences material produces low frequency noise in addition.Thereby, particularly under the occasion of having relatively high expectations, use and to be subjected to great limitation the use of this material.
Purpose of the present invention just is to provide a kind of above-mentioned material defective that overcomes, adopting modified vinylon fiber and mixture of glass fibers is framework material, make tackiness agent and add the friction material that does not contain asbestos of friction modifier with phenol-formaldehyde resin modified, this material can corrosion, pyroconductivity is low, does not produce noise, and it is good to have heat resistance, wear rate is low, characteristics such as free from environmental pollution in manufacture process and the braking process.
Friction material of the present invention is by framework material, tackiness agent and friction modifier constitute, framework material is modified vinylon fiber and mixture of glass fibers, modified vinylon fiber is commercially available 1-2.5D * 5-7mm modification polyvinyl superbhort fiber, be that polyvinyl alcohol fiber is handled and made through the physical-chemical method modification, the surface modification of this fiber original structure, become coarse, hollow is more, increased bonding strength with tackiness agent, its dry heat resistance temperature is 230 ℃, hydroscopicity is 5%, and glass fibre length is 7-12mm, about alkalinity 12%, and the process silane coupler carries out surface treatment.Tackiness agent is commercially available phenol-formaldehyde resin modified, this resin by linear phenol-aldehyde resin through cashew nut shell oil, cyanurotriamide modified and make, solid content 98 ± 2%, softening point is 100-120 ℃.Friction modifier can be selected materials such as feldspar in powder, graphite, brown iron oxide, barium sulphate, tyre talc and brass wire.The concrete component of friction material is constructed as follows table.
After table is seen literary composition
In above-mentioned material compositing range, friction modifier is regulated between 43-65%, and some modifier can not add yet.When modified vinylon fiber is 7-12%, glass fibre is 15-20%, and phenol-formaldehyde resin modified is 18-25%, and friction modifier constitutes the best of friction material during for 52-60% and forms.
The friction material that does not contain asbestos of the present invention is made framework material with modified vinylon fiber and glass fibre, framework material through short cut, expanded back with mix through the phenol-formaldehyde resin modified of pulverizing and the friction modifier of drying, by stirring and weighing, then under 165 ± 5 ℃ of temperature, with 15MPa pressure, control time is pressed 70-90 second/millimeters thick goods, is pressed into finished product, forms goods after the depanning under 180 ℃ of temperature in heat treatment 1-2 hour.
The friction material that does not contain asbestos of the present invention is applicable to brake facing and the dry clutch dough sheet of making industrial machinery, also is applicable to the clutch surface of making farm machinery.Especially be fit to do boring mechanic brake lining and pneumatic tyre formula clutch surface.Friction material of the present invention is because raw material adopts nonmetallic material, thus have not can corrosion, pyroconductivity is low, do not produce the advantage of noise during braking; Make framework material owing to adopt modified vinylon fiber and mixture of glass fibers to substitute asbestos, therefore free from environmental pollution in manufacture process and braking process, and it is good to have heat resistance, friction ractor height, the low and impact strength advantages of higher of wear rate.
Below be embodiments of the invention.
Embodiment one, break friction lining or clutch surface (the size difference of mould)
(1) set of dispense ratio
(table is seen the literary composition back)
(2) make
Make framework material with modified vinylon fiber and glass fibre, framework material is cut through short, mix after expanded with through the phenol-formaldehyde resin modified of pulverizing and the friction modifier of drying, by stirring and weighing, then under 165 ± 5 ℃ of temperature, with 15MPa pressure, by the 80 seconds/millimeters thick goods left and right sides control time, be pressed into finished product, under 180 ℃ of temperature, formed goods after the depanning in heat treatment 1-2 hour.
(3) performance index
(table is seen the literary composition back)
Comparative Examples 1, the Properties of Friction Materials index of employing asbestos
(table is seen the literary composition back)
Compare with Comparative Examples 1, framework material of the present invention is not because the self-characteristic of material can produce environmental pollution.The friction factor of friction material of the present invention is all than asbestos friction material height in the temperature range of test determination.The wear rate of friction material of the present invention after 150 ℃, rises and progressively descends with temperature, only is 0.23(10 in the time of 300 ℃
-7Cm
3/ Nm), and asbestos friction material increases with temperature rising wear rate, is 0.62 in the time of 300 ℃
-7Cm
3/ Nm).The hardness of friction material of the present invention is lower, and impact strength is approximately 3 times of asbestos material.
Comparative Examples 2, adopting the iron-based original ore powder is the asbestos-free friction material performance index of body material.
(table is seen the literary composition back)
With Comparative Examples 2 relatively, framework material of the present invention is because the characteristic of material itself, can corrosion, pyroconductivity is low, and can not produce noise when braking.In the temperature range of test determination, along with the friction factor of temperature rising iron-based original ore powder friction material progressively descends, when 250 ℃ and 300 ℃, be respectively 0.485(μ) and 0.368(μ), and the friction factor of friction material of the present invention is respectively 0.512(μ) and 0.400(μ), along with the wear rate of the rising iron-based original ore powder friction material of temperature increases greatly, wear rate reaches 0.826(10 in the time of 300 ℃
-7Cm
3/ Nm), and friction material wear rate of the present invention only is 0.23(10
-7Cm
3/ Nm).
Embodiment two, brake bush or clutch surface (the size difference of mould).
(1) set of dispense ratio
The material specification of each component is identical with embodiment one, has increased the friction modifier tyre talc simultaneously, and its specification requirement fineness is the 20-80 order.Concrete proportioning is as follows: modified vinylon fiber 8%, glass fibre 14%, phenol-formaldehyde resin modified 28%, feldspar in powder 12%, graphite 8%, brown iron oxide 11%, barium sulphate 10%, tyre talc 5%, the short brass wire 4% of cutting.
(2) manufacture method is with embodiment one.
(3) performance index
Compare with Comparative Examples 1, comparing result and embodiment's one comparing result is basic identical.Compare with Comparative Examples 2, the present embodiment friction material is except that the characteristic with material itself, and its friction factor is slightly low than the friction material of Comparative Examples 2, and wear rate is significantly less than the friction material of Comparative Examples 2.
Title specification weight percentage (%)
1, modified vinylon fiber 1-2.5D * 5-7mm, anti-in hot temperature
230 ℃, hydroscopicity 5% 5-15
2, glass fibre length 7-12mm, alkalinity about 12%
Carry out surface treatment 12-35 through silane coupler
3, the phenol-formaldehyde resin modified solid content 98 ± 2%, softening point 100
-120℃ 15-28
4, feldspar in powder fineness 100 order all-pass mistakes, proportion 2.54
-2.57, hardness 6 10-15
5, graphite proportion 2.25, hardness 1 5-10
6, brown iron oxide fineness 100 order all-pass mistakes, proportion 5.12
-5.14, hardness 5.5,1560 ℃ of 10-15 of fusing point
7, barium sulphate fineness 100 order all-pass mistakes, proportion 4.2
Hardness 2.5-3.5,1580 ℃ of 10-12 of fusing point
8, tyre talc fineness 20-80 order 5-8
9, the short brass wire 3-5 that cuts
Title specification weight percentage (%)
1, modified vinylon fiber " 02 type ", 1-2.5D * 5-7mm,
230 ℃ of dry heat resistance temperature, hydroscopicity 5% 10
Length 7-12mm, alkalinity about 12%
2, glass fibre is through the surface treatment of KH550 silane coupler, 18
Room temperature is dried the back dried 0.5 hour down at 120-160 ℃.
3, modified phenolic thermoplastic model YSM-S, solid content 98 ± 2%
Property resin free phenol＜5%, softening point 100-120 ℃ 25
4, feldspar in powder fineness 100 order all-pass mistakes, proportion 2.54
-2.57, hardness 6 14
5, graphite proportion 2.25, hardness 18
Iron oxide content is more than 90%, fineness 100
6, brown iron oxide order all-pass mistake, proportion 5.12-5.24,10
1560 ℃ of fusing points, hardness 5.5.
7, barium sulphate fineness 100 order all-pass mistakes, proportion 4.2
Hardness 2.5-3.5,1580 ℃ 10 of fusing point
8, the short brass wire 5 of cutting
1, D-MS fixed speed fricting test
Performance friction factor (μ) wear rate (10
-7Cm
3/ Nm)
100℃ 150℃ 200℃ 250℃ 300℃ 100℃ 150℃ 200℃ 250℃ 300℃
Index 0.378 0.450 0.504 0.512 0.400 0.20 0.81 0.34 0.30 0.23
2, physical and mechanical properties:
Performance hardness (HB) impact strength (Kgfcm/cm
2)
Index 12.41 10.08(0.99J/cm
2)
Comparative Examples 1, the Properties of Friction Materials index of employing asbestos
1, D-MS fixed speed fricting test
Performance friction factor (μ) wear rate (10
-7Cm
3/ Nm)
100℃ 150℃ 200℃ 250℃ 300℃ 100℃ 150℃ 200℃ 250℃ 300℃
Index 0.325 0.365 0.429 0.377 0.308 0.17 0.10 0.11 0.34 0.62
2, physical and mechanical properties:
Performance hardness (HB) impact strength (Kgfcm/cm
2)
Index 27.8 3.31(0.32J/cm
2)
Performance friction factor (μ) wear rate (10
-7Cm
3/ Nm)
100℃ 150℃ 200℃ 250℃ 300℃ 100℃ 150℃ 200℃ 250℃ 300℃
Index 0.494 0.603 0.569 0.485 0.368 0.163 0.182 0.295 0.529 0.826
1, D-MS fixed speed fricting test
Performance friction factor (μ) wear rate (10
-7Cm
3/ Nm)
100℃ 150℃ 200℃ 250℃ 300℃ 100℃ 150℃ 200℃ 250℃ 300℃
Index 0.330 0.464 0.498 0.424-0.10 0.12 0.06 0.09-
2, physical and mechanical properties:
Performance hardness (HB) impact strength (Kgfcm/cm
2)
Index 27.75 10.89(1.08J/cm
2)
Claims (5)
1, a kind of friction material, it is characterized in that it constitutes framework material with modified vinylon fiber and glass fibre, be tackiness agent with the phenol-formaldehyde resin modified and added friction modifier that the composition weight per distribution ratio of friction material is: modified vinylon fiber 5-15%, glass fibre 12-25%, phenol-formaldehyde resin modified 15-28%, friction modifier 43-65%.
2, friction material according to claim 1, the fiber number that it is characterized in that modified vinylon fiber is 1-2.5D, and length is 5-7mm, and the length of glass fibre is 7-12mm, and alkalinity is about 12%, and carries out surface treatment through silane coupler.
3, friction material according to claim 1, it is characterized in that friction modifier can select feldspar in powder, graphite, brown iron oxide, barium sulphate, tyre talc and the short brass wire of cutting, their composition weight percentage is: feldspar in powder 10-15%, graphite 5-10%, brown iron oxide 10-15%, barium sulphate 10-12%, tyre talc 5-8%, the short brass wire 3-5% that cuts.
4, friction material according to claim 1 is characterized in that its component optimum weight per distribution ratio is: modified vinylon fiber 7-12%, glass fibre 15-20%, phenol-formaldehyde resin modified 18-25%, friction modifier 52-60%.
5, a kind of manufacture method of friction material as claimed in claim 1, it is characterized in that its adopts modified vinylon fiber and glass fibre to make framework material, with framework material through short cut with expanded back with mix through the phenol-formaldehyde resin modified of pulverizing and the friction modifier of drying, by stirring and weighing, then under 165 ± 5 ℃ of temperature, with 15MPa pressure, the control time is pressed 70-90 second/millimeters thick goods, be pressed into finished product, under 180 ℃ of temperature, formed goods after the depanning in heat treatment 1-2 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103534 CN1027989C (en) | 1992-05-07 | 1992-05-07 | Asbestos-free friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103534 CN1027989C (en) | 1992-05-07 | 1992-05-07 | Asbestos-free friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1078297A CN1078297A (en) | 1993-11-10 |
| CN1027989C true CN1027989C (en) | 1995-03-22 |
Family
ID=4940261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92103534 Expired - Fee Related CN1027989C (en) | 1992-05-07 | 1992-05-07 | Asbestos-free friction material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027989C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205957B (en) * | 2006-12-20 | 2010-08-11 | 包亦波 | Framework material for mechanical braking and clutch friction system |
| CN101664979B (en) * | 2009-10-09 | 2011-09-28 | 山东双连制动材料有限公司 | Preparation method of friction material |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047485C (en) * | 1996-04-19 | 1999-12-15 | 邓兆财 | Automatic brake block without asbestos |
| DE10225954A1 (en) * | 2002-06-11 | 2003-12-24 | Schunk Kohlenstofftechnik Gmbh | Fiber composite component |
| DE112016007327T5 (en) * | 2016-11-15 | 2019-07-18 | Borgwarner Inc. | friction material |
-
1992
- 1992-05-07 CN CN 92103534 patent/CN1027989C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205957B (en) * | 2006-12-20 | 2010-08-11 | 包亦波 | Framework material for mechanical braking and clutch friction system |
| CN101664979B (en) * | 2009-10-09 | 2011-09-28 | 山东双连制动材料有限公司 | Preparation method of friction material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1078297A (en) | 1993-11-10 |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |