CN104613113A - Silane coupling agent modified artificial graphite resin-based brake pad and manufacturing method thereof - Google Patents
Silane coupling agent modified artificial graphite resin-based brake pad and manufacturing method thereof Download PDFInfo
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- CN104613113A CN104613113A CN201410693224.5A CN201410693224A CN104613113A CN 104613113 A CN104613113 A CN 104613113A CN 201410693224 A CN201410693224 A CN 201410693224A CN 104613113 A CN104613113 A CN 104613113A
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Abstract
The invention discloses a silane coupling agent modified artificial graphite resin-based brake pad and a manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad. Materials comprise phenolic resin, rubber and organic friction powder, short cut steel fibers, red copper fibers, aramid fibers, high-aluminum ceramic fibers, mineral fibers, silane coupling agents, graphite, composite fillers and the like. The manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad includes the steps that the silane coupling agents are used for modifying the artificial graphite first, the materials are weighed in sequence and added into a high-speed mixer to be uniformly mixed, pressing and heat curing treatment are conducted according to the dry method one-shot forming method for traditional resin-based friction materials, and finally machining, ceramic treatment and inspecting packaging are carried out. The silane coupling agent modified artificial graphite resin-based brake pad manufactured according to the method has the advantages of being large in braking torque, comfortable and stable in emergency braking, free of obvious degeneration and noise and less in dust fall. The production method is simple and environmentally friendly. The silane coupling agent modified artificial graphite resin-based brake pad is especially suitable for urban bus air disk brakes and has broad market prospects.
Description
Technical field
The invention belongs to new material technology field, particularly one silane coupler modified artificial graphite resin base brake block and preparation method thereof.
Background technique
Along with the raising day by day of living standard, automobile has become a kind of important traffic tool of people's trip, and the development of Automotive Friction Material constrains the raising of car speed and the Security of brake system to a certain extent.The progress of science and technology has promoted improving constantly of car speed, and automobile speed-raising can cause the high-temperature hot decline problem of brake block, improves the Main way that heat fade performance has become brake block research.Current, the greatest problem that Automotive Friction Material runs into is exactly the serious and less stable of heat fade of present stage Automotive Friction Material.Particularly under high temperature (more than 350 DEG C), automotive brake material wearing and tearing are very serious, in some descending processes, owing to touching on the brake for a long time, the temperature of brake block sharply raises, under serious conditions, resin can decompose even carbonization, causes brake failure, produces serious safety issue.
Graphite is as the key raw material inside automobile brake sheet, it mainly plays lubrication, noise reduction and stable friction factor, but because graphite surface hydroxyl structure is few, with resin matrix poor compatibility, easily coming off when braking, it is bigger than normal to cause product to wear and tear, particularly during high temperature wear, wear rate is multiplied, and the porous adsorption structure of graphite also easily adheres to and pollutes wheel hub simultaneously.This patent adopts silane coupler surface modification artificial graphite effectively can improve the friction and wear behavior of resin-matrix friction material, reduces heat fade.
Summary of the invention
The object of the present invention is to provide a kind of silane coupler modified artificial graphite resin base brake block and preparation method thereof.The present invention is by the effect of coupling agent surface modification, improve surface physics and the chemical characteristics of artificial graphite, improve the combination force of resin and fiber and filler, reduce the negative effect that heat fade brings, thus significantly improve friction factor and the wear rate of automobile brake sheet, improve the Security of brake system.
In order to solve the problem, the technical solution used in the present invention is: a kind of silane coupler modified artificial graphite resin base brake block, it is characterized in that: its material prescription by percentage to the quality: resin/rubber 5 ~ 12%, pottery/mineral fibre 10 ~ 25%, aramid fibre 1 ~ 4%, potassium titanate crystal whisker 4 ~ 21%, Steel Fibre 10 ~ 20%, red copper fiber 5 ~ 10%, antimony sulphide 3 ~ 8%, artificial graphite 6 ~ 16%, chromite 1 ~ 2%, pyrite 1 ~ 5%, modified aluminas 2 ~ 8%, organic Frication powder 2 ~ 5%, silane coupler 1 ~ 3%, mineral filler 10 ~ 20%.
Wherein in an embodiment, its material prescription described by percentage to the quality: resin/rubber 8%, pottery/mineral fibre 15%, aramid fibre 2%, potassium titanate crystal whisker 8%, Steel Fibre 15%, red copper fiber 8%, antimony sulphide 6%, artificial graphite 10%, chromite 2%, pyrite 3%, modified aluminas 6%, organic Frication powder 3%, silane coupler 2%, mineral filler 12%.
Wherein in an embodiment, described modified aluminas is silane-modified aluminium oxide.
Wherein in an embodiment, described mineral filler is one or more mixtures in cryolite, lightweight high profit soil, blanc fixe, cyanogen salt.
A preparation method for silane coupler modified artificial graphite resin base brake block, is characterized in that, comprise the steps:
1) modification: with hydrochloric acid configure PH=3-5, mass fraction is the silane coupler solution of 3-4%, stirs 40-60min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 8-10min, then dry 150-200min at 110-130 DEG C, obtains silane coupler modified artificial graphite after drying;
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 3 ~ 7min;
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 230-270 DEG C;
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 200 ~ 230 DEG C, insulation 4 ~ 5h, then takes out stove by brake block and is cooled to room temperature;
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
Wherein in an embodiment, the specific operation of modification in described step 1) be with hydrochloric acid configure PH=4, mass fraction is the silane coupler solution of 3%, stirs 50min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 9min, then dry 180min at 120 DEG C, obtains silane coupler modified artificial graphite after drying.
Wherein in an embodiment, in described step 3), mixing time is 5min.
Wherein in an embodiment, in described step 4), hot-forming temperature is 250 DEG C.
Wherein in an embodiment, in described step 5), heat treated specific operation are for be warmed up to 210 DEG C by the stage in brake block heat treatment furnace, and insulation 4.5h, then takes out stove by brake block and be cooled to room temperature.
Beneficial effect of the present invention is: (1) the invention provides a kind of silane coupler modified artificial graphite resin base brake block, in its formula system, friction material adopts resin, rubber is matrix, chromite, pyrite, modified aluminas are that increasing rubs agent, antimony sulphide, crystalline flake graphite, modified artificial graphite, as lubricant component, add Steel Fibre, copper fiber, aramid fibre, potassium titanate crystal whisker, ceramic fiber and mineral fibre as reinforcing phase.Mineral fillers etc., except playing the effect that reduces costs, can also be stablized friction factor, regulate the porosity ratio of material, improve insensitivity.Simultaneously by coupling agent to artificial graphite surface modifying effect, improve surface physics and the chemical characteristics of artificial graphite, improve the combination force of resin and fiber and filler, reduce the negative effect that heat fade brings.Compare with unmodified brake block, by silane coupler modified artificial graphite, can mechanical properties of materials be increased substantially, particularly high temperature decline performance, and improve its friction stability.
(2) the invention provides a kind of preparation method of silane coupler modified artificial graphite resin base brake block, it is by the artificial graphite potting resin base frication material of silane coupler surface modification, its friction factor fluctuating range is little, high temperature friction coefficient remains on more than 0.35 substantially, and other properties are all better than the resin-matrix friction material not having modification.And compare through the abrasive dust of the artificial graphite potting resin base frication material of modification the material not having surface modification, abrasive dust particle diameter discreteness is less, and Large stone proportion is less.The method technique simple possible is easy to operate, is beneficial to and realizes large-scale promotion and application.
(3) brake block to sum up utilizing the present invention to obtain has moderate static friction coefficient, high temperature decline stable performance, stable friction factor, low brake noise, to the less and advantage that manufacture cost is lower of antithesis wearing and tearing, fully can meet the requirement of automobile high temperature friction material braking.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, elaborate below to the specific embodiment of the present invention.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can implement to be much different from other modes described here, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
A kind of silane coupler modified artificial graphite resin base brake block, is characterized in that: its material prescription by percentage to the quality: resin/rubber 5 ~ 12%, pottery/mineral fibre 10 ~ 25%, aramid fibre 1 ~ 4%, potassium titanate crystal whisker 4 ~ 21%, Steel Fibre 10 ~ 20%, red copper fiber 5 ~ 10%, antimony sulphide 3 ~ 8%, artificial graphite 6 ~ 16%, chromite 1 ~ 2%, pyrite 1 ~ 5%, modified aluminas 2 ~ 8%, organic Frication powder 2 ~ 5%, silane coupler 1 ~ 3%, mineral filler 10 ~ 20%.
Preferably, its material prescription described by percentage to the quality: resin/rubber 8%, pottery/mineral fibre 15%, aramid fibre 2%, potassium titanate crystal whisker 8%, Steel Fibre 15%, red copper fiber 8%, antimony sulphide 6%, artificial graphite 10%, chromite 2%, pyrite 3%, modified aluminas 6%, organic Frication powder 3%, silane coupler 2%, mineral filler 12%.
Wherein, described modified aluminas is silane-modified aluminium oxide.
Wherein, described mineral filler is the mixture of cryolite, lightweight high profit soil, blanc fixe, cyanogen salt.
In above-mentioned formula system, friction material adopts resin, rubber is matrix, chromite, pyrite, modified aluminas are that increasing rubs agent, antimony sulphide, crystalline flake graphite, modified artificial graphite, as lubricant component, add Steel Fibre, copper fiber, aramid fibre, potassium titanate crystal whisker, ceramic fiber and mineral fibre as reinforcing phase.Mineral fillers etc., except playing the effect that reduces costs, can also be stablized friction factor, regulate the porosity ratio of material, improve insensitivity.
A preparation method for silane coupler modified artificial graphite resin base brake block, is characterized in that, comprise the steps:
1) modification: with hydrochloric acid configure PH=3-5, mass fraction is the silane coupler solution of 3-4%, stirs 40-60min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 8-10min, then dry 150-200min at 110-130 DEG C, obtains silane coupler modified artificial graphite after drying;
Preferably, the specific operation of modification in described step 1) be with hydrochloric acid configure PH=4, mass fraction is the silane coupler solution of 3%, stirs 50min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 9min, then dry 180min at 120 DEG C, obtains silane coupler modified artificial graphite after drying.
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 3 ~ 7min;
Preferably, in described step 3), mixing time is 5min.
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 230-270 DEG C;
Preferably, in described step 4), hot-forming temperature is 250 DEG C.
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 200 ~ 230 DEG C, insulation 4 ~ 5h, then takes out stove by brake block and is cooled to room temperature;
Preferably, in described step 5), heat treated specific operation are for be warmed up to 210 DEG C by the stage in brake block heat treatment furnace, and insulation 4.5h, then takes out stove by brake block and be cooled to room temperature.
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
Above-mentioned preparation method is by the artificial graphite potting resin base frication material of silane coupler surface modification, its friction factor fluctuating range is little, high temperature friction coefficient remains on more than 0.35 substantially, and other properties are all better than the resin-matrix friction material not having modification.And compare through the abrasive dust of the artificial graphite potting resin base frication material of modification the material not having surface modification, abrasive dust particle diameter discreteness is less, and Large stone proportion is less.The method technique simple possible is easy to operate, is beneficial to and realizes large-scale promotion and application.
It is below specific embodiment.
Embodiment 1
A kind of silane coupler modified artificial graphite resin base brake block, its material prescription by percentage to the quality: resin/rubber 5%, pottery/mineral fibre 25%, aramid fibre 1%, potassium titanate crystal whisker 18%, Steel Fibre 20%, red copper fiber 5%, antimony sulphide 3%, artificial graphite 6%, chromite 1%, pyrite 1%, modified aluminas 2%, organic Frication powder 2%, silane coupler 1%, mineral filler 10%.Described modified aluminas is silane-modified aluminium oxide.Described mineral filler is the mixture of cryolite (1%), lightweight high profit soil (2%), blanc fixe (6%), cyanogen salt (1%).
A preparation method for silane coupler modified artificial graphite resin base brake block, comprises the steps:
1) modification: with hydrochloric acid configure PH=3, mass fraction is the silane coupler solution of 3%, stirs 60min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 8min, then dry 200min at 110 DEG C, obtains silane coupler modified artificial graphite after drying;
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 3min;
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 230 DEG C;
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 200 DEG C, insulation 5h, then takes out stove by brake block and is cooled to room temperature;
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
Embodiment 2
A kind of silane coupler modified artificial graphite resin base brake block, its material prescription described by percentage to the quality: resin/rubber 12%, pottery/mineral fibre 10%, aramid fibre 4%, potassium titanate crystal whisker 4%, Steel Fibre 10%, red copper fiber 5%, antimony sulphide 3%, artificial graphite 16%, chromite 2%, pyrite 5%, modified aluminas 8%, organic Frication powder 5%, silane coupler 1%, mineral filler 15%.Described modified aluminas is silane-modified aluminium oxide.Described mineral filler is the mixture of cryolite (2%), lightweight high profit soil (3%), blanc fixe (8%), cyanogen salt (2%).
A preparation method for silane coupler modified artificial graphite resin base brake block, comprises the steps:
1) modification: with hydrochloric acid configure PH=5, mass fraction is the silane coupler solution of 4%, stirs 60min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 10min, then dry 150min at 130 DEG C, obtains silane coupler modified artificial graphite after drying;
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 7min;
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 270 DEG C;
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 230 DEG C, insulation 4h, then takes out stove by brake block and is cooled to room temperature;
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
Embodiment 3
A kind of silane coupler modified artificial graphite resin base brake block, its material prescription by percentage to the quality: resin/rubber 8%, pottery/mineral fibre 15%, aramid fibre 2%, potassium titanate crystal whisker 8%, Steel Fibre 15%, red copper fiber 8%, antimony sulphide 6%, artificial graphite 10%, chromite 2%, pyrite 3%, modified aluminas 6%, organic Frication powder 3%, silane coupler 2%, mineral filler 12%.Described modified aluminas is silane-modified aluminium oxide.Described mineral filler is the mixture of cryolite (2%), lightweight high profit soil (3%), blanc fixe (6%), cyanogen salt (1%).
A preparation method for silane coupler modified artificial graphite resin base brake block, comprises the steps:
1) modification: with hydrochloric acid configure PH=4, mass fraction is the silane coupler solution of 3%, stirs 50min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 9min, then dry 180min at 120 DEG C, obtains silane coupler modified artificial graphite after drying;
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 5min;
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 250 DEG C;
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 210 DEG C, insulation 4.5h, then takes out stove by brake block and is cooled to room temperature;
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
Utilize embodiment 3 gained brake block to carry out performance test, test result respectively as shown in Table 1 and Table 2.
Table 1: wear test
Table 2: stand test
Result shows, the polishing machine of the disc brake pad adopting silane coupler modified artificial graphite to prepare is good, and wear extent is about 0.35mm.Fail functional, stationarity is higher, the wear extent of antithesis is less than 0.01mm, Friction Disk Surface complete, less fall ash, without turned-down edge, flawless.
The above embodiment only have expressed several mode of execution of the present invention, and it describes comparatively in detail concrete, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a silane coupler modified artificial graphite resin base brake block, is characterized in that: its material prescription by percentage to the quality: resin/rubber 5 ~ 12%, pottery/mineral fibre 10 ~ 25%, aramid fibre 1 ~ 4%, potassium titanate crystal whisker 4 ~ 21%, Steel Fibre 10 ~ 20%, red copper fiber 5 ~ 10%, antimony sulphide 3 ~ 8%, artificial graphite 6 ~ 16%, chromite 1 ~ 2%, pyrite 1 ~ 5%, modified aluminas 2 ~ 8%, organic Frication powder 2 ~ 5%, silane coupler 1 ~ 3%, mineral filler 10 ~ 20%.
2. one according to claim 1 silane coupler modified artificial graphite resin base brake block, is characterized in that: its material prescription described by percentage to the quality: resin/rubber 8%, pottery/mineral fibre 15%, aramid fibre 2%, potassium titanate crystal whisker 8%, Steel Fibre 15%, red copper fiber 8%, antimony sulphide 6%, artificial graphite 10%, chromite 2%, pyrite 3%, modified aluminas 6%, organic Frication powder 3%, silane coupler 2%, mineral filler 12%.
3. one according to claim 1 silane coupler modified artificial graphite resin base brake block, is characterized in that: described modified aluminas is silane-modified aluminium oxide.
4. one according to claim 1 silane coupler modified artificial graphite resin base brake block, is characterized in that: described mineral filler is one or more mixtures in cryolite, lightweight high profit soil, blanc fixe, cyanogen salt.
5. a preparation method for silane coupler modified artificial graphite resin base brake block, is characterized in that: comprise the steps:
1) modification: with hydrochloric acid configure PH=3-5, mass fraction is the silane coupler solution of 3-4%, stirs 40-60min under normal temperature, and silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 8-10min, then dry 150-200min at 110-130 DEG C, obtains silane coupler modified artificial graphite after drying;
2) prepare burden: weigh each component materials by said ratio;
3) batch mixing: dropped in the batch mixer closed by load weighted each material, mixing time is 3 ~ 7min;
4) shaping: to take mixture by brake block model, pour in hot-pressing die, the cold base compacting of normal temperature, then carries out hot pressing at 230-270 DEG C;
5) heat treatment: the stage in brake block heat treatment furnace is warmed up to 200 ~ 230 DEG C, insulation 4 ~ 5h, then takes out stove by brake block and is cooled to room temperature;
6) finally the product of heat treatment gained is carried out grinding, chamfering according to specification requirement, fluting, then through spraying, marking, the operations such as processing become silane coupler modified artificial graphite resin base brake block.
6. the preparation method of a kind of silane coupler modified artificial graphite resin base brake block according to claim 5, it is characterized in that, the specific operation of modification in described step 1) be with hydrochloric acid configure PH=4, mass fraction is the silane coupler solution of 3%, stir 50min under normal temperature, silane coupler is hydrolyzed; The silane coupler solution configured be added drop-wise in artificial graphite according to mass ratio 3:10 and stir 9min, then dry 180min at 120 DEG C, obtains silane coupler modified artificial graphite after drying.
7. the preparation method of a kind of silane coupler modified artificial graphite resin base brake block according to claim 5, it is characterized in that, in described step 3), mixing time is 5min.
8. the preparation method of a kind of silane coupler modified artificial graphite resin base brake block according to claim 5, it is characterized in that, in described step 4), hot-forming temperature is 250 DEG C.
9. the preparation method of a kind of silane coupler modified artificial graphite resin base brake block according to claim 5, it is characterized in that, in described step 5), heat treated specific operation are for be warmed up to 210 DEG C by the stage in brake block heat treatment furnace, insulation 4.5h, then takes out stove by brake block and is cooled to room temperature.
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| CN105465253A (en) * | 2015-12-23 | 2016-04-06 | 佛山早稻田科技服务有限公司 | Friction material |
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| CN107553944A (en) * | 2017-08-14 | 2018-01-09 | 杭州西湖摩擦材料有限公司 | A kind of preparation method of wear brake pad |
| CN108458016A (en) * | 2018-03-19 | 2018-08-28 | 湖南博云汽车制动材料有限公司 | A kind of friction material and the preparation method and application thereof of automobile parking braking hoof |
| CN108795382A (en) * | 2018-05-18 | 2018-11-13 | 黄石市长鑫新材料有限公司 | A kind of nanoparticle surface modified antimony trisulfide and its preparation method and application |
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Application publication date: 20150513 |