CN105713569A - Preparation method of fiber-doped resin based friction material - Google Patents
Preparation method of fiber-doped resin based friction material Download PDFInfo
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- CN105713569A CN105713569A CN201610132429.5A CN201610132429A CN105713569A CN 105713569 A CN105713569 A CN 105713569A CN 201610132429 A CN201610132429 A CN 201610132429A CN 105713569 A CN105713569 A CN 105713569A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
Abstract
The invention provides a preparation method of a fiber-doped resin based friction material. Firstly, carbon fiber, aluminum silicate fiber, glass fiber, polyoxyethylene alkylphenol ether and soy lecithin are mixed and grinded to obtain mixed powder A; secondly, kaolin, alumina, barium sulfate, hydroxyl terminated polybutadiene and 2,2-dimethylolpropionic acid are added to a ball mill for mixing, and then acrylic resin and phenolic resin are added and mixed to obtain mixed powder B; thirdly, the mixed powder A and the mixed powder B are mixed and are subjected to cold pressing at room temperature to obtain a crude formed product; finally, the crude formed product is subjected to primary heating, cold pressing and secondary heating to obtain the friction material. The friction material prepared by means of the preparation method has good mechanical properties and friction performance.
Description
Technical field
The invention belongs to resin-matrix friction material technical field, be specifically related to the system of the resin-matrix friction material of a kind of fiber that adulterates
Preparation Method.
Background technology
Friction material is a class compound material, has and be widely applied very much in the productive life of the mankind.At automobile, aircraft
Deng brake unit in, friction material is indispensable, plays vital effect, its performance to a certain extent with its
The technical merit direct correlation of goods.
In recent years, industrial, mechanical develop rapidly so that the speed of service of aircraft, vehicle etc. improves constantly, and result in and rubs
The requirement wiping material also will improve day by day.Present stage, the material of various advanced persons is used in the research of friction material, numerous
New-type friction material is arisen at the historic moment.
Resin-matrix friction material is using resin as binding agent, fiber substance as reinforcing material, and add various filler or
Frictional property regulator and the multicomponent high molecular class composite that synthesizes.For the most other kinds of friction material, resin base
Friction material is owing to possessing many advantages such as adaptive surface is extensive, production cost is low, technique is simple, performance easily regulation,
Obtain applying widely and developing in friction material field.
Fiber-reinforced resin base frication material is a class friction material with wide application prospect.Usual this kind of friction material is sent out
Wave some advantage of reinforcing fiber component so that friction material has the performance more excellent than conventional friction material.Two kinds or
The composite fibre of multiple fiber hybrid composition is better than the reinforced effects of Single Fiber to the reinforced effects of friction material.But, existing
In the stage, the research of composite fibre is only confined to steel fibre and non-metallic fibers is combined aspect.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art to provide the preparation side of the resin-matrix friction material of a kind of fiber that adulterates
Method, gained friction material has good mechanical property and frictional behaviour.
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes carbon fiber 3～9 parts, alumina silicate fibre 2～10 parts, glass fibre 1～7 parts, gathers
Ethylene oxide alkyl phenol ether 0.8～2.5 parts, soybean lecithin 1～4 parts, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 2～6 parts, aluminium oxide 1～7 parts, barium sulfate 3～8 parts, polybutadiene
Glycol 2～5 parts, 2,2-dihydromethyl propionic acid 3～6 parts add in ball mill, and mixing adds acrylic resin 4～12
Part, phenolic resin 3～5 parts, mixing, obtain mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding thick
Product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Further, the granularity of step 1 gained mixed-powder A is 20～40 mesh.
Further, the mixed process of step 2 is at CO2Carry out under atmosphere.
Further, the granularity of step 2 gained mixed powder B is 20～40 mesh.
Further, pressure of colding pressing in step 3 is 40～60MPa.
Further, in step 4, a heating-up temperature is 200～250 DEG C, and the time is 10～20min.
Further, pressure of colding pressing in step 4 is 40～60MPa.
Further, in step 4, post bake temperature is 160～180 DEG C, and the time is 2～4h.
Further, in step 2, acrylic resin is through epoxy resin modification.
Further, step 3 also needs to add PAMC 3～7 parts.
The friction material of the present invention has good mechanical property and frictional behaviour.
Detailed description of the invention
Embodiment 1
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes 3 parts of carbon fiber, alumina silicate fibre 2 parts, glass fibre 1 part, polyethylene glycol oxide alkane
Base 2, 2-Oxydiphenol 0.8 part, soybean lecithin 1 part, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 2 parts, aluminium oxide 1 part, 3 parts of barium sulfate, polybutadiene diol 2 parts,
2,2-dihydromethyl propionic acids 3 parts add in ball mill, mixing, add acrylic resin 4 parts, 3 parts of phenolic resin, mixed
Close, obtain mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding thick
Product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Wherein, the granularity of step 1 gained mixed-powder A is 20 mesh；The mixed process of step 2 is at CO2Carry out under atmosphere,
The granularity of gained mixed powder B is 20 mesh；Pressure of colding pressing in step 3 is 40MPa；In step 4, a heating-up temperature is
200 DEG C, the time is 20min, and pressure of colding pressing is 40MPa, and post bake temperature is 160 DEG C, and the time is 4h.
Embodiment 2
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes 6 parts of carbon fiber, alumina silicate fibre 9 parts, glass fibre 2 parts, polyethylene glycol oxide alkane
Base 2, 2-Oxydiphenol 1.5 parts, soybean lecithin 3 parts, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 5 parts, aluminium oxide 3 parts, 7 parts of barium sulfate, polybutadiene diol 4 parts,
2,2-dihydromethyl propionic acids 5 parts add in ball mill, mixing, add acrylic resin 10 parts, 4 parts of phenolic resin,
Mixing, obtains mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding thick
Product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Wherein, the granularity of step 1 gained mixed-powder A is 30 mesh；The mixed process of step 2 is at CO2Carry out under atmosphere,
The granularity of gained mixed powder B is 30 mesh；Pressure of colding pressing in step 3 is 50MPa；In step 4, a heating-up temperature is
230 DEG C, the time is 20min, and pressure of colding pressing is 40MPa, and post bake temperature is 170 DEG C, and the time is 3h.
Embodiment 3
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes 9 parts of carbon fiber, alumina silicate fibre 10 parts, glass fibre 7 parts, polyethylene glycol oxide
Alkyl phenol ether 2.5 parts, soybean lecithin 4 parts, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 6 parts, aluminium oxide 7 parts, 8 parts of barium sulfate, polybutadiene diol 5 parts,
2,2-dihydromethyl propionic acids 6 parts add in ball mill, mixing, add acrylic resin 12 parts, 5 parts of phenolic resin,
Mixing, obtains mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding thick
Product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Wherein, the granularity of step 1 gained mixed-powder A is 40 mesh；The mixed process of step 2 is at CO2Carry out under atmosphere,
The granularity of gained mixed powder B is 40 mesh；Pressure of colding pressing in step 3 is 60MPa；In step 4, a heating-up temperature is
250 DEG C, the time is 10min, and pressure of colding pressing is 60MPa, and post bake temperature is 180 DEG C, and the time is 2h.
Embodiment 4
The present embodiment is with the difference of embodiment 2: in step 2, acrylic resin is through epoxy resin modification.Modification side
Method is: adds E-44 epoxy resin 10Kg, methyl methacrylate 20Kg in reactor, starts stirring, is warmed up to 80 DEG C,
Dropping acrylic acid 3Kg, after all dripping off, reacts 2h.By 1-Octyl acrylate 15Kg, styrene 10Kg, acrylic acid
Hydroxypropyl acrylate 10Kg, trimethyol propane triacrylate 2Kg mix with initiator azobisisobutyronitrile 2Kg.Treat all
After dissolving, instill in reaction bulb.Reaction 2～3h.Cooling, stopped reaction, obtain the acrylic resin of epoxy resin modification.
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes 6 parts of carbon fiber, alumina silicate fibre 9 parts, glass fibre 2 parts, polyethylene glycol oxide alkane
Base 2, 2-Oxydiphenol 1.5 parts, soybean lecithin 3 parts, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 5 parts, aluminium oxide 3 parts, 7 parts of barium sulfate, polybutadiene diol 4 parts,
2,2-dihydromethyl propionic acids 5 parts add in ball mill, mixing, add acrylic resin modified 10 parts, phenolic resin 4
Part, mixing, obtain mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding thick
Product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Wherein, the granularity of step 1 gained mixed-powder A is 30 mesh；The mixed process of step 2 is at CO2Carry out under atmosphere,
The granularity of gained mixed powder B is 30 mesh；Pressure of colding pressing in step 3 is 50MPa；In step 4, a heating-up temperature is
230 DEG C, the time is 20min, and pressure of colding pressing is 40MPa, and post bake temperature is 170 DEG C, and the time is 3h.
Embodiment 5
The present embodiment is with the difference of embodiment 4: also need in step 3 add PAMC 3～7 parts.
The preparation method of the resin-matrix friction material of a kind of fiber that adulterates, comprises the following steps:
Step 1, in parts by weight, takes 6 parts of carbon fiber, alumina silicate fibre 9 parts, glass fibre 2 parts, polyethylene glycol oxide alkane
Base 2, 2-Oxydiphenol 1.5 parts, soybean lecithin 3 parts, mixing, grind, obtain mixed-powder A；
Step 2, in parts by weight, by Kaolin 5 parts, aluminium oxide 3 parts, 7 parts of barium sulfate, polybutadiene diol 4 parts,
2,2-dihydromethyl propionic acids 5 parts add in ball mill, mixing, add acrylic resin modified 10 parts, phenolic resin 4
Part, mixing, obtain mixed powder B；
Step 3, mixes step 1 gained mixed-powder A, step 2 gained mixed powder B, PAMC 3 parts
Closing, room temperature is colded pressing, and obtains molding crude product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
Wherein, the granularity of step 1 gained mixed-powder A is 30 mesh；The mixed process of step 2 is at CO2Carry out under atmosphere,
The granularity of gained mixed powder B is 30 mesh；Pressure of colding pressing in step 3 is 50MPa；In step 4, a heating-up temperature is
230 DEG C, the time is 20min, and pressure of colding pressing is 40MPa, and post bake temperature is 170 DEG C, and the time is 3h.
Embodiment 1 to 5 gained friction material is carried out performance test, and result is as follows:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Rockwell hardness/HRL | 61 | 59 | 61 | 62 | 70 |
| Tensile strength/MPa | 40 | 40 | 41 | 44 | 52 |
| Bending strength/MPa | 90 | 95 | 98 | 100 | 115 |
| Comprcssive strength/MPa | 160 | 165 | 165 | 168 | 175 |
| Shearing strength/MPa | 50 | 52 | 53 | 48 | 62 |
| Thermal conductivity/W (m K)-1 | 40 | 41 | 41 | 40 | 48 |
| Linear expansion coefficient/DEG C-1 | 11.0×10-6 | 11.3×10-6 | 11.1×10-6 | 10.0×10-6 | 10.0×10-6 |
| Coefficient of friction | 0.45 | 0.47 | 0.46 | 0.55 | 0.53 |
| Wear rate/10-7g·(m·N)-1 | 0.245 | 0.252 | 0.247 | 0.219 | 0.195 |
As seen from the above table, the friction material of the present invention has good mechanical property and frictional behaviour.In embodiment 4, to third
Olefin(e) acid resin is modified, and can improve the frictional behaviour of friction material, in embodiment 5, and adding of PAMC
Enter, be possible not only to improve the mechanical property of friction material, moreover it is possible to improve frictional behaviour.
Claims (10)
1. the preparation method of the resin-matrix friction material of the fiber that adulterates, it is characterised in that: comprise the following steps:
Step 1, in parts by weight, takes carbon fiber 3～9 parts, alumina silicate fibre 2～10 parts, glass fibre 1～7 parts, polyoxyethylenealkylphenol ether 0.8～2.5 parts, soybean lecithin 1～4 parts, mixing, grinds, obtains mixed-powder A；
Step 2, in parts by weight, by Kaolin 2～6 parts, aluminium oxide 1～7 parts, barium sulfate 3～8 parts, polybutadiene diol 2～5 parts, 2,2-dihydromethyl propionic acid 3～6 parts add in ball mill, mixing, add acrylic resin 4～12 parts, phenolic resin 3～5 parts, mixing, obtains mixed powder B；
Step 3, by step 1 gained mixed-powder A, the mixing of step 2 gained mixed powder B, room temperature is colded pressing, and obtains molding crude product；
Step 4, by step 3 gained molding crude product through once heating, colding pressing, post bake, obtain friction material.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: the granularity of step 1 gained mixed-powder A is 20～40 mesh.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: the mixed process of step 2 is at CO2Carry out under atmosphere.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: the granularity of step 2 gained mixed powder B is 20～40 mesh.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: pressure of colding pressing in step 3 is 40～60MPa.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: in step 4, a heating-up temperature is 200～250 DEG C, and the time is 10～20min.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: pressure of colding pressing in step 4 is 40～60MPa.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: in step 4, post bake temperature is 160～180 DEG C, and the time is 2～4h.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: in step 2, acrylic resin is through epoxy resin modification.
The preparation method of the resin-matrix friction material of doping fiber the most according to claim 1, it is characterised in that: step 3 also needs to add PAMC 3～7 parts.
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| CN201610132429.5A CN105713569A (en) | 2016-03-09 | 2016-03-09 | Preparation method of fiber-doped resin based friction material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108978346A (en) * | 2018-07-11 | 2018-12-11 | 薛向东 | A kind of preparation method of foam resin glue immersion-type paper friction material |
| CN109135152A (en) * | 2017-06-16 | 2019-01-04 | 合肥杰事杰新材料股份有限公司 | A kind of carbon fiber ball modified light-sensitive resin composite materials and preparation method thereof |
| CN111089132A (en) * | 2019-12-26 | 2020-05-01 | 大冶市启发矿产品有限公司 | Friction material and preparation method thereof |
| CN112384713A (en) * | 2018-05-18 | 2021-02-19 | 洛科威国际有限公司 | Friction material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487005A (en) * | 2003-07-04 | 2004-04-07 | 福州大学 | Hefero fiber friction material and its prepn |
| CN1850882A (en) * | 2006-05-29 | 2006-10-25 | 南京航空航天大学 | Supersonic motor thermosetting resin base friction material and friction layer manufacturing method and auxiliary tool |
| CN101402779A (en) * | 2008-11-11 | 2009-04-08 | 长春市恒德摩擦制品有限公司 | Non-asbestos drilling machine braking block material and manufacturing process therefor |
| CN101555399A (en) * | 2009-05-20 | 2009-10-14 | 山东大王信义载重汽车配件有限公司 | Novel brake pad material of truck |
| CN102093841A (en) * | 2010-11-11 | 2011-06-15 | 咸阳师范学院 | Double-adhesive friction material |
| CN102794912A (en) * | 2012-08-24 | 2012-11-28 | 董雪 | Preparation method of friction material for vehicle brake disc |
-
2016
- 2016-03-09 CN CN201610132429.5A patent/CN105713569A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487005A (en) * | 2003-07-04 | 2004-04-07 | 福州大学 | Hefero fiber friction material and its prepn |
| CN1850882A (en) * | 2006-05-29 | 2006-10-25 | 南京航空航天大学 | Supersonic motor thermosetting resin base friction material and friction layer manufacturing method and auxiliary tool |
| CN101402779A (en) * | 2008-11-11 | 2009-04-08 | 长春市恒德摩擦制品有限公司 | Non-asbestos drilling machine braking block material and manufacturing process therefor |
| CN101555399A (en) * | 2009-05-20 | 2009-10-14 | 山东大王信义载重汽车配件有限公司 | Novel brake pad material of truck |
| CN102093841A (en) * | 2010-11-11 | 2011-06-15 | 咸阳师范学院 | Double-adhesive friction material |
| CN102794912A (en) * | 2012-08-24 | 2012-11-28 | 董雪 | Preparation method of friction material for vehicle brake disc |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109135152A (en) * | 2017-06-16 | 2019-01-04 | 合肥杰事杰新材料股份有限公司 | A kind of carbon fiber ball modified light-sensitive resin composite materials and preparation method thereof |
| CN112384713A (en) * | 2018-05-18 | 2021-02-19 | 洛科威国际有限公司 | Friction material |
| CN108978346A (en) * | 2018-07-11 | 2018-12-11 | 薛向东 | A kind of preparation method of foam resin glue immersion-type paper friction material |
| CN111089132A (en) * | 2019-12-26 | 2020-05-01 | 大冶市启发矿产品有限公司 | Friction material and preparation method thereof |
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