CN101613516A - Be used to prepare the friction material composition and the friction materials of brake facing - Google Patents
Be used to prepare the friction material composition and the friction materials of brake facing Download PDFInfo
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Abstract
The invention provides a kind of friction material composition that is used to prepare brake facing, said composition contains tackiness agent, strongthener, increases the agent that rubs, lubricant and filler, and wherein, described tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin.The present invention also provides a kind of friction materials that is used to prepare brake facing, and this friction materials is obtained by the hot-forming postheat treatment of a kind of friction material composition, and wherein, said composition is a friction material composition provided by the invention.The friction material composition that is used to prepare brake facing provided by the invention can significantly improve the stability of the frictional coefficient of friction materials.
Description
Technical field
The invention relates to a kind of be used to the prepare friction material composition of automobile brake sheet and the friction materials for preparing by this friction material composition.
Background technology
Along with the fast development of automotive industry, automobile pollution is also in continuous expansion, and China Automobile Industry realized 721.6 ten thousand of sales of automobile in 2006.Automobile brake sheet is as the key part of brake system of car, and it is reliable to satisfy brake safe, and noiseless requirement operates steadily.At present, semi-metallic brake pad has occupied the bigger market share on the domestic motor market, and domestic original-pack supporting market, Europe are that car uses semi-metal or low metal brake block more, and America and Japan are that car uses ceramic brake mostly, and independent brand mainly is a semi-metallic brake pad.In the outlet brake facing, more than 60% semi-metallic brake pad, ceramic brake less than 10%.
Semi-metallic brake pad is as organic bonding type synthetic friction material, and when the friction catch temperature reached more than 400 ℃, the resin-rubber adhesive that is adopted can produce the phenomenon that thermolysis causes frictional coefficient to reduce suddenly, i.e. " heat fading " of friction materials.
For example, a kind of asbestos-free non-metal friction material is disclosed among the CN 101077912A, wherein, this friction materials by weight percentage, form by the aramid fiber of 2-10, the LAPINUS inorganic mineral fiber of 10-30%, the resol of 5-20%, the acrylonitrile-butadiene rubber powder of 2-5%, the mineral filler of 20-35% and the low friction compound that increases of 5-25%, described mineral filler is selected from one or both in barium sulfate, the lime carbonate, and the described low friction compound that increases is molybdenumdisulphide, graphite, coke and aluminum oxide.Though this novel no graphite non-metallic friction materials is high temperature resistant, yet this friction materials frictional coefficient instability at high temperature.
Summary of the invention
The objective of the invention is to overcome the unsettled defective of frictional coefficient under the high temperature of the existing friction materials that is used to prepare brake facing, provide a kind of can make stable friction factor under the high temperature be used to prepare brake facing friction materials composition and by the friction materials of this friction material composition preparation.
The invention provides a kind of composition that is used to prepare the friction materials of brake facing, said composition contains tackiness agent, strongthener, increases the agent that rubs, lubricant and filler, and wherein, described tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin.
The present invention also provides a kind of friction materials that is used to prepare brake facing, and this friction materials is obtained by the hot-forming postheat treatment of a kind of friction material composition, and wherein, said composition is a friction material composition provided by the invention.
Data from table 1 as can be seen, when in temperature is 100-350 ℃ scope, changing, compare with the reference friction materials AC1-AC2 that Comparative Examples 1-2 obtains, the variation of the frictional coefficient of the friction materials A1 that the embodiment of the invention 1 obtains is very little, has illustrated that the friction material composition that is used to prepare brake facing provided by the invention has improved the stability of the frictional coefficient of friction materials significantly.
Embodiment
The invention provides a kind of friction material composition that is used to prepare brake facing, said composition contains tackiness agent, strongthener, increases the agent that rubs, lubricant and filler, and wherein, described tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin.
In the described composition, gross weight with described composition is a benchmark, gross weight with described composition is a benchmark, the content of described tackiness agent is 6-20 weight %, the content of described strongthener is 15-40 weight %, the described content that increases the agent that rubs is 10-30 weight %, and the content of described lubricant is 5-20 weight %, and the content of described filler is 15-40 weight %.Under the preferable case, gross weight with described composition is a benchmark, the content of described tackiness agent is 10-18 weight %, the content of described strongthener is 20-35 weight %, the described content that increases the agent that rubs is 15-25 weight %, the content of described lubricant is 10-15 weight %, and the content of described filler is 20-35 weight %.
Among the present invention, described tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and be Powdered, the average particle diameter of described tackiness agent can be the 40-75 micron, and the described average particle diameter that increases the agent that rubs can be the 25-77 micron, and the lubricant average particle diameter can be the 30-45 micron; The mean diameter of described strongthener can be the 100-200 micron, and mean length can be 0.1-0.4 centimetre; The average particle diameter of described filler can be 80 nanometers to 45 micron.
Among the present invention, be benchmark with the gross weight of tackiness agent, the content of described cashew nut shell oil and paracril double-modification phenolic resin is not less than 40 weight %.According to this preferred implementation, can further improve the stability of the frictional coefficient under the friction materials high temperature.
Tackiness agent described in the present invention all can be commercially available.
Among the present invention, modified phenolic resins is continued to use the common implication in this area, be meant the resol that makes by chemistry or physical method (for example copolymerization or mechanically mixing) modification with a kind of different compound or polymkeric substance, double-modification phenolic resin is meant the resol that makes by chemistry or physical method (for example copolymerization or mechanically mixing) modification with two kinds of different compounds or polymkeric substance, after the modification, the impelling strength of resol, cohesiveness, physical strength, thermotolerance, flame retardant resistance, dimensional stability, curing speed, moulding process etc. can be improved.Described cashew nut shell oil and paracril double-modification phenolic resin are meant the resol that makes by chemistry (for example copolymerization) or physical method (for example mechanically mixing) modification with cashew nut shell oil and paracril.Preferred described cashew nut shell oil of the present invention and paracril double-modification phenolic resin are cashew nut shell oil and the paracril double-modification phenolic resin that obtains by chemical process, can further improve the stability of the frictional coefficient of friction materials by this preferred implementation;
When adopting chemical process to prepare cashew nut shell oil and paracril double-modification phenolic resin, the condition that described chemical process prepares cashew nut shell oil and paracril double-modification phenolic resin can be the copolymerization conditions of routine, and the weight ratio of the consumption of cashew nut shell oil and paracril and resol can be 0.04-0.1: 0.03-0.1: 1.
Cashew nut shell oil that chemically makes and paracril double-modification phenolic resin can be commercially available, for example can adopt the cashew nut shell oil and the paracril double-modification phenolic resin of elder brother's benefit resin material KT3640CRA of company model, the cashew nut shell oil of this model and paracril double-modification phenolic resin are made by cashew nut shell oil and paracril and resol copolymerization, and the weight ratio of the consumption of cashew nut shell oil and paracril and resol is generally 0.04-0.05: 0.03-0.04: 1.
When described cashew nut shell oil and paracril double-modification phenolic resin make by chemical process, except that cashew nut shell oil and paracril double-modification phenolic resin, described tackiness agent can also contain resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, in Resins, epoxy and the urethane resin one or more, gross weight with tackiness agent is a benchmark, resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, the total content of Resins, epoxy and urethane resin is greater than 0 to 60 weight %.
When described cashew nut shell oil and paracril double-modification phenolic resin are prepared by physical method, can make by cashew nut oil modified alkyd resin is mixed with paracril, wherein, the weight ratio of the consumption of cashew nut oil modified alkyd resin and paracril can be 10-25, described cashew nut oil modified alkyd resin can be commercially available, for example can adopt the cashew nut oil modified alkyd resin of elder brother's benefit resin material KT3870 of company model, this cashew nut oil modified alkyd resin makes by chemical process, and wherein the weight ratio of the consumption of cashew nut shell oil and resol can be 5-15: 100.
When described cashew nut shell oil and paracril double-modification phenolic resin make by physical method, except that cashew nut shell oil and paracril double-modification phenolic resin, described tackiness agent can also contain resol, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, in Resins, epoxy and the urethane resin one or more, gross weight with tackiness agent is a benchmark, resol, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, the total content of Resins, epoxy and urethane resin is greater than 0 to 60 weight %.
In the composition provided by the invention, described strongthener can be the mixture of steel fiber and mineral fibre and/or organic fibre; Under the preferable case, in strongthener, the weight ratio of steel fiber and mineral fibre and organic fibre total amount is 1-2.5.
Described steel fiber can be the combination of steel fiber A and steel fiber B, described steel fiber A can be steel fiber and/or iron fiber, described steel fiber B can be copper fiber and/or aluminum fiber, in the described steel fiber, the content of steel fiber A and steel fiber B can in very large range change, under the preferable case, with respect to the steel fiber A of 100 weight parts, the content of described steel fiber B is the 35-55 weight part.
The kind of described mineral fibre and organic fibre is conventionally known to one of skill in the art, and for example, described mineral fibre can be in silicon ash cotton fibre, ca silicate fibre, aluminum silicate fiber, rockwool coating resin fiber and the composite mineral wool one or more; Described organic fibre can be aramid fiber and/or aramid pulp.
Describedly increase the agent that rubs and be used to regulate frictional behaviour, improve the frictional coefficient of material at low thermophase (room temperature-250 ℃) and hot stage (250 ℃-400 ℃), can for various routines be used to prepare brake facing friction materials increase the agent that rubs, for example can be in zinc oxide, magnesium oxide, aluminum oxide, magnetite powder, brass breeze, troilite powder, chromite powder, Feldspar Powder, ground dolomite and the zeolite powder one or more.
Under the preferable case, describedly increasing the agent that rubs and contain magnetite powder, is benchmark with the described gross weight that increases the agent that rubs, and the content of described magnetite powder is 20-50 weight %, and the average particle diameter of described magnetite powder is the 25-45 micron.When the content that increases the magnetite powder described in the agent that rubs and average particle diameter are in described scope, remove the stability that can further improve the frictional coefficient under the friction materials high temperature, the wear rate under the high temperature of friction materials can also be reduced, the hardness of friction materials can be suitably reduced simultaneously.The content of Z 250 is more than the 80 weight % in the general commercially available described magnetite powder, among the present invention, the content that uses Z 250 is that the above magnetite powder of 80 weight % can be realized purpose of the present invention, but the content of Z 250 is more than the 94 weight % in the preferred described magnetite powder, according to this preferred implementation, the stability of the frictional coefficient under the friction materials high temperature can be further improved, the hardness of the wear rate and the friction materials of friction materials can be further reduced simultaneously.The content of described Z 250 is that the above magnetite powder of 94 weight % also can be commercially available.
Described lubricant is used for forming the friction, lubrication film at frictional interface, can reduce the wearing and tearing that frictional coefficient can reduce mating material again, thereby improve the work-ing life of friction materials, can be the lubricant of friction materials that is used to prepare brake facing of various routines, for example can be in synthetic graphite, metallic sulfide, crystalline flake graphite and the molybdenumdisulphide one or more, described metallic sulfide is one or more in zinc sulphide, antimony sulfide, cupric sulfide, the moly-sulfide.
Described filler can be the filler of friction materials that is used to prepare brake facing of various routines, for example can contain in kaolin, wollastonite, ground barium sulfate, vermiculite power, mica powder and the cryolite powder one or more, the average particle diameter of kaolin, wollastonite, ground barium sulfate, vermiculite power, mica powder and cryolite powder is the 30-45 micron.
Under the preferable case, described filler also contains paracril and polyphenylene sulfide; Gross weight with composition is a benchmark, and the content of paracril can be 1-10 weight %, is preferably 2-7 weight %; The content of polyphenylene sulfide can be 1-10 weight %, is preferably 2-8 weight %.According to this preferred implementation, can suitably reduce the hardness of friction materials, and can improve the stability under the high temperature of friction materials and reduce wear rate.In addition, preferred described paracril and polyphenylene sulfide are Powdered, and the average particle diameter of described paracril can be the 80-150 nanometer, and the average particle diameter of described polyphenylene sulfide can be the 30-45 micron.Described paracril is the class synthetic rubber that divinyl and vinyl cyanide make through letex polymerization.The content of acrylonitrile unit can be 15-50 weight % in the described paracril, for example, can be NBR-40 for marque, NBR-26, and the paracril of NBR-18, wherein, 40,26,18 represent the content of acrylonitrile unit in the paracril.The degree of crystallinity of described polyphenylene sulfide can be 55-65%.Described paracril and polyphenylene sulfide all can be commercially available, for example paracril can adopt the paracril of the VP-402 model that the Beijing Chemical Research Institute produces (average particle diameter is 90 nanometers, the content of vinyl cyanide is 40 weight % in the paracril), polyphenylene sulfide can adopt the polyphenylene sulfide (average particle diameter is 45 microns, and degree of crystallinity is 60%) of the bright poly-plastic cement PPS-HA2 of company limited model.
The present invention has no particular limits described preparation of compositions method, as long as with tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and mix.The kind of each component that adds when mixing is with above corresponding component is identical, this no longer deposited stating.Described blended condition and equipment are conventionally known to one of skill in the art, for example, can use the pears rake formula mixer of the JF810SJ model of company of electromechanical equipment institute of Jilin University production to mix, described blended condition comprises that mixing temperature can be 0-30 ℃, mixing time can be 10-30 minute, is preferably 10-20 minute.
The present invention also provides a kind of friction materials that is used to prepare brake facing, and this friction materials is obtained by the hot-forming postheat treatment of a kind of friction material composition, and wherein, said composition is a friction material composition provided by the invention.
Described hot-forming condition and equipment are conventionally known to one of skill in the art, for example, can use carry out in the thermocompressor of the XL100 model that auspicious imperial friction materials equipment mould company limited produces hot-forming, described hot-forming condition comprises that hot-forming temperature is 150-190 ℃, hot-forming pressure is 20-28MPa, and the hot-forming time is 5-10 minute.
Described heat treated condition and equipment are conventionally known to one of skill in the art, for example, can use in the baking oven equipment of the 702A model that auspicious imperial friction materials equipment mould company limited produces and heat-treat, also can directly continue to heat-treat in thermocompressor, the pressure that should add heat machine this moment transfers to 0.Described heat treated condition can comprise that heat treated temperature is 100-220 ℃, and heat treatment period is 5-15 hour; If when heat-treating, the temperature of the friction material composition after hot-forming has been reduced to below 100 ℃, this moment, preferred employing temperature programming was heat-treated, and described heat treated condition can be included in 0.5-1.5 hour temperature is risen to 120 ℃, and keeps 1-3 hour at 120 ℃; In 1.5-2.5 hour, temperature is risen to 180 ℃ by 120 ℃ afterwards, and kept 2-4 hour at 180 ℃; In 0.5-1.5 hour, temperature is risen to 200 ℃ by 180 ℃ subsequently, and kept 0.5-1.5 hour at 200 ℃.
Below by embodiment the present invention is described in more detail.
Embodiment 1
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
(1) is used to prepare the preparation of the friction material composition of brake facing
Cashew nut shell oil and paracril double-modification phenolic resin (elder brother's benefit resin material KT-3640CRA of company model with 14 weight parts, average particle diameter is 60 microns, wherein, when preparation cashew nut shell oil and paracril double-modification phenolic resin, the weight ratio of the consumption of cashew nut shell oil and paracril and resol is 0.04: 0.04: 1), the steel fiber of 10 weight parts (big positive steel fiber company limited, D1-80, mean diameter is 150 microns, mean length is 0.3 centimetre), the copper fiber of 5 weight parts (big positive steel fiber company limited, DT1-99, mean diameter is 150 microns, mean length is 0.3 centimetre), the composite mineral wool of 10 weight parts (gets smelting mining industry company limited, mean diameter is 100 microns, mean length is 0.4 centimetre), the content of the Z 250 of 12 weight parts is magnetite powder (the prosperous excessive mineral products company limited of 94 weight %, average particle diameter is 35 microns), the chromite powder of 6 weight parts (is contained safe chemical industry company limited, average particle diameter is 45 microns), the zeolite powder of 6 weight parts (is contained safe chemical industry company limited, average particle diameter is 25 microns), the crystalline flake graphite of 6 weight parts (day Sheng graphite company limited, average particle diameter is 40 microns), the antimony sulfide of 6 weight parts (is contained safe chemical industry company limited, average particle diameter is 40 microns), the paracril of the 5 weight parts (VP-402 of Beijing Chemical Research Institute company model, average particle diameter is 90 nanometers, the content of vinyl cyanide is 40 weight % in the paracril), the polyphenylene sulfide of 5 weight parts (the bright poly-plastic cement PPS-HA0 of company limited model, average particle diameter is 40 microns, degree of crystallinity is 65%) and the ground barium sulfate of 15 weight parts (contain safe chemical industry company limited, 40 microns of average particle diameters) the JF810SJ type pears rake formula mixer of putting into the production of electromechanical equipment institute of Jilin University mixes, described blended condition comprises that mixing temperature is 20 ℃, mixing time is 15 minutes, and the friction material composition that obtains being used to preparing brake facing is used for the composition of brake facing.
(2) preparation of friction materials
The above-mentioned friction material composition that is used to prepare brake facing that obtains is put into thermocompressor (auspicious imperial friction materials equipment mould company limited, the XL100 type) carry out hot-forming in the metal die, described hot-forming condition comprises that hot-forming temperature is 170 ℃, hot-forming pressure is 24MPa, and the hot-forming time is 7 minutes; Temperature drops to room temperature, friction materials after hot-forming is placed heat treatment oven (auspicious imperial friction materials equipment mould company limited, the 702A type) heat-treat in, described heat treated condition is included in 1 hour temperature is risen to 120 ℃ by room temperature, and keeps 2 hours at 120 ℃; In 2 hours, temperature is risen to 180 ℃ by 120 ℃ afterwards, and kept 3 hours at 180 ℃; In 1 hour, temperature is risen to 200 ℃ by 180 ℃ subsequently, and kept 1 hour at 200 ℃; Obtain friction materials A1.
Comparative Examples 1
This Comparative Examples is used to illustrate the friction material composition and the friction materials that are used to prepare brake facing of reference.
Prepare friction material composition and the friction materials AC1 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, resol (holy well chemical industry company limited with 14 weight parts, PF6000, average particle diameter are 60 microns) replace the cashew nut shell oil and the paracril double-modification phenolic resin of 14 weight parts.
Comparative Examples 2
This Comparative Examples is used to illustrate the friction material composition and the friction materials that are used to prepare brake facing of reference.
Prepare friction material composition and the friction materials AC2 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, the cashew nut shell oil and the paracril double-modification phenolic resin that replace 14 weight parts with the cashew nut oil modified alkyd resin (elder brother's benefit resin material KT-3870 of company model, average particle diameter is 60 microns) of 14 weight parts.
Embodiment 2
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Cashew nut shell oil and paracril double-modification phenolic resin (elder brother's benefit resin material KT-3640CRB of company model with 7 weight parts, average particle diameter is 40 microns, wherein, when preparation cashew nut shell oil and paracril double-modification phenolic resin, the weight ratio of the consumption of cashew nut shell oil and paracril and resol is 0.05: 0.08: 1), 3 parts by weight of epoxy resin (holy well chemical industry company limited, PF6400-A, average particle diameter is 40 microns), the iron fiber of 10 weight parts (big positive steel fiber company limited, mean diameter is 100 microns, mean length is 0.1 centimetre), the aluminum fiber of 8 weight parts (big positive steel fiber company limited, DA-#000, mean diameter is 100 microns, mean length is 0.2 centimetre), the ca silicate fibre of 17 weight parts (prosperous excessive mineral products company limited, mean diameter is 100 microns, mean length is 0.2 centimetre), the content of the Z 250 of 4 weight parts is magnetite powder (the prosperous excessive mineral products company limited of 94 weight %, average particle diameter is 25 microns), the troilite powder of 10 weight parts (prosperous excessive mineral products company limited, average particle diameter is 30 microns), the zeolite powder of 6 weight parts (is contained safe chemical industry company limited, average particle diameter is 30 microns), the crystalline flake graphite of 5 weight parts (day Sheng graphite company limited, average particle diameter is 30 microns), the antimony sulfide of 10 weight parts (is contained safe chemical industry company limited, average particle diameter is 30 microns), the paracril of the 2 weight parts (VP-412 of Beijing Chemical Research Institute company model, average particle diameter is 110 nanometers, the content of vinyl cyanide is 26 weight % in the paracril), the polyphenylene sulfide of 2 weight parts (the bright poly-plastic cement PPS-HA1 of company limited model, average particle diameter is 30 microns, degree of crystallinity is 55%), the kaolin of 10 weight parts (is contained safe chemical industry company limited, average particle diameter is 30 microns) and the ground barium sulfate of 6 weight parts (contain safe chemical industry company limited, average particle diameter is 30 microns) put into the JF810SJ type pears rake formula mixer that electromechanical equipment institute of Jilin University produces and mix, described blended condition comprises that mixing temperature is 20 ℃, mixing time is 15 minutes, and the friction material composition that obtains being used to preparing brake facing is used for the composition of brake facing.
(2) preparation of friction materials
The above-mentioned friction material composition that is used to prepare brake facing that obtains is put into thermocompressor (auspicious imperial friction materials equipment mould company limited, the XL100 type) carry out hot-forming in the metal die, described hot-forming condition comprises that hot-forming temperature is 150 ℃, hot-forming pressure is 28MPa, and the hot-forming time is 10 minutes; Directly the friction materials after hot-forming is placed heat treatment oven (auspicious imperial friction materials equipment mould company limited then, the 702A type) heat-treats in, described heat treated condition comprises that heat treated temperature is 100 ℃, and heat treatment period is 15 hours, obtains friction materials A2.
Embodiment 3
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Cashew nut shell oil and paracril double-modification phenolic resin (elder brother's benefit resin material KT-3646 of company model with 8 weight parts, average particle diameter is 75 microns, wherein, when preparation cashew nut shell oil and nitrile rubber modified phenolic resin, the weight ratio of the consumption of cashew nut shell oil and paracril and resol is 0.08: 0.1: 1), the trimeric cyanamide of 2 weight parts-cashew nut shell oil double-modification phenolic resin (the strong resin company limited of China 5160 models, average particle diameter is 75 microns), 3 parts by weight of epoxy resin (holy well chemical industry company limited, PF6400-A, average particle diameter is 40 microns), the resol of 5 weight parts (holy well chemical industry company limited, PF6000, average particle diameter is 75 microns), the iron fiber of 7 weight parts (big positive steel fiber company limited, mean diameter is 200 microns, mean length is 0.4 centimetre), the aluminum fiber of 8 weight parts (big positive steel fiber company limited, DA-#000, mean diameter is 100 microns, mean length is 0.2 centimetre), the ca silicate fibre of 2 weight parts (prosperous excessive mineral products company limited, mean diameter is 100 microns, mean length is 0.2 centimetre), the aramid fiber of 4 weight parts (the limited N601 model of Yantai spandex share, mean diameter is 100 microns, mean length is 0.2 centimetre), 5.6 the content of the Z 250 of weight part is magnetite powder (the prosperous excessive mineral products company limited of 96 weight %, average particle diameter is 45 microns), 10.4 the troilite powder of weight part (prosperous excessive mineral products company limited, average particle diameter is 30 microns), the crystalline flake graphite of 5 weight parts (day Sheng graphite company limited, average particle diameter is 30 microns), the zinc sulphide of 2 weight parts (is contained safe chemical industry company limited, average particle diameter is 45 microns), the antimony sulfide of 3 weight parts (is contained safe chemical industry company limited, average particle diameter is 30 microns), the paracril of the 7 weight parts (VP-402 of Beijing Chemical Research Institute company model, average particle diameter is 90 nanometers, the content of vinyl cyanide is 40 weight % in the paracril), the polyphenylene sulfide of 8 weight parts (the bright poly-plastic cement PPS-HA2 of company limited model, average particle diameter is 45 microns, degree of crystallinity is 60%), the kaolin of 10 weight parts (is contained safe chemical industry company limited, average particle diameter is 30 microns) and the ground barium sulfate of 10 weight parts (contain safe chemical industry company limited, average particle diameter is 30 microns) put into the JF810SJ type pears rake formula mixer that electromechanical equipment institute of Jilin University produces and mix, described blended condition comprises that mixing temperature is 20 ℃, mixing time is 15 minutes, and the friction material composition that obtains being used to preparing brake facing is used for the composition of brake facing.
(2) preparation of friction materials
The above-mentioned friction material composition that is used to prepare brake facing that obtains is put into thermocompressor (auspicious imperial friction materials equipment mould company limited, the XL100 type) carry out hot-forming in the metal die, described hot-forming condition comprises that hot-forming temperature is 190 ℃, hot-forming pressure is 20MPa, and the hot-forming time is 5 minutes; Then hot-forming pressure is adjusted to 0, continues to heat-treat in this thermocompressor, described heat treated condition comprises that heat treated temperature is 210 ℃, and heat treatment period is 5 hours, obtains friction materials A3.
Embodiment 4
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A4 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, described cashew nut shell oil and paracril double-modification phenolic resin make with following method: with cashew nut oil modified alkyd resin (elder brother's benefit resin material KT-3870 of company model, average particle diameter is 60 microns, during the preparation cashew nut oil modified alkyd resin, the weight ratio of the consumption of cashew nut shell oil and resol is 15: 100) and paracril (the Nanjing Sheng Dong N-IS of chemical company model, average particle diameter is 60 microns) mix and promptly obtain cashew nut shell oil and paracril double-modification phenolic resin, wherein, the weight ratio of the consumption of cashew nut oil modified alkyd resin and paracril is 100: 10.
Embodiment 5
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A5 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, described cashew nut shell oil and paracril double-modification phenolic resin make with following method: with cashew nut oil modified alkyd resin (the holy well chemical industry PF-6290A of company limited model, average particle diameter is 60 microns, during the preparation cashew nut oil modified alkyd resin, the weight ratio of the consumption of cashew nut shell oil and resol is 7: 100) and paracril (the Nanjing Sheng Dong N-IS of chemical company model, average particle diameter is 60 microns) mix and promptly obtain cashew nut shell oil and paracril double-modification phenolic resin, wherein, the weight ratio of the consumption of cashew nut oil modified alkyd resin and paracril is 100: 7.
Embodiment 6
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A6 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, described cashew nut shell oil and paracril double-modification phenolic resin make with following method: with cashew nut oil modified alkyd resin (the holy well chemical industry PF6291-A of company limited model, average particle diameter is 60 microns, during the preparation cashew nut oil modified alkyd resin, the weight ratio of the consumption of cashew nut shell oil and resol is 9: 100) and paracril (the Nanjing Sheng Dong N-IS of chemical company model, average particle diameter is 60 microns) mix and promptly obtain cashew nut shell oil and paracril double-modification phenolic resin, wherein, the weight ratio of the consumption of cashew nut oil modified alkyd resin and paracril is 100: 4.
Embodiment 7
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A7 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, with the content of the Z 250 of 12 weight parts is magnetite powder (the prosperous excessive mineral products company limited of 94 weight %, average particle diameter is 55 microns) to replace the content of the Z 250 of 12 weight parts be the magnetite powder (prosperous excessive mineral products company limited, average particle diameter is 35 microns) of 94 weight %.
Embodiment 8
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A8 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, with the content of the Z 250 of 12 weight parts is magnetite powder (the prosperous excessive mineral products company limited of 80 weight %, average particle diameter is 35 microns) to replace the content of the Z 250 of 12 weight parts be the magnetite powder (prosperous excessive mineral products company limited, average particle diameter is 35 microns) of 94 weight %.
Embodiment 9
This embodiment is used to illustrate friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
Prepare friction material composition and the friction materials A9 that is used to prepare brake facing respectively according to the method identical with embodiment 1, different is, wollastonite (Kingsoft wollastonite company limited with 10 weight parts, average particle diameter is 40 microns) (VP-402 of Beijing Chemical Research Institute company model, average particle diameter are 90 nanometers to replace the paracril of 5 weight parts, the content of vinyl cyanide is 40 weight % in the paracril) and the polyphenylene sulfide (the bright poly-plastic cement PPS-HA0 of company limited model, average particle diameter are 40 microns, and degree of crystallinity is 65%) of 5 weight parts.
Embodiment 10-18
This embodiment is used to illustrate the frictional behaviour of friction materials provided by the invention.
According to GB 5763-1998 standard, frictional coefficient and the wear rate of the friction materials A1-A9 that obtains of test implementation example 1-9 respectively, the result is as shown in table 1.
According to the GB/T5766-1996 standard, the hardness of the friction materials A1-A9 that obtains of test implementation example 1-9 respectively, the result is as shown in table 2.
Comparative Examples 3-4
The frictional behaviour of the reference friction materials that this embodiment is used to illustrate that Comparative Examples makes.
According to the method identical with embodiment 10-18, test comparison example 1-2 obtain the frictional behaviour of reference friction materials AC1-AC2, the result is respectively as shown in Table 1 and Table 2.
Table 1
Table 2
| Performance | Embodiment 10 | Embodiment 11 | Embodiment 12 | Embodiment 13 | Embodiment 14 | Embodiment 15 | Embodiment 16 | Embodiment 17 | Embodiment 18 | Comparative Examples 3 | Comparative Examples 4 |
| Friction materials | ??A1 | ??A2 | ??A3 | ??A4 | ??A5 | ??A6 | ??A7 | ??A8 | ??A9 | ??AC1 | ??AC2 |
| Hardness (HRS) | ??65 | ??68 | ??68 | ??70 | ??70 | ??65 | ??85 | ??82 | ??84 | ??74 | ??76 |
From the data of last table 1 as can be seen, when in temperature is 100-350 ℃ scope, changing, compare with the reference friction materials AC1-AC2 that Comparative Examples 1-2 obtains, the variation of the frictional coefficient of the friction materials A1 that the embodiment of the invention 1 obtains is very little, has illustrated that the friction material composition that is used to prepare brake facing provided by the invention has improved the stability of the frictional coefficient of friction materials significantly.
It can also be seen that from the data of last table 1, when in temperature is 100-350 ℃ scope, changing, compare with the friction materials A4-A6 that embodiment 4-6 obtains, the variation of the frictional coefficient of the friction materials A1 that the embodiment of the invention 1 obtains is less, illustrated and used when adopting cashew nut shell oil that chemical process makes and paracril double-modification phenolic resin, can further improve the stability of the frictional coefficient of friction materials.
From the data of last table 1 and table 2 as can be seen, when changing in temperature is 100-350 ℃ scope, compare with implementing the 7 friction materials A7 that obtain, the variation of the frictional coefficient of the friction materials A1 that the embodiment of the invention 1 obtains is less; The wear rate of friction materials A1 under 350 ℃ that embodiment 1 obtains only is 0.55 * 10
-7Cm
3/ Nm, and the wear rate of friction materials A7 under 350 ℃ that embodiment 7 obtains is 0.96 * 10
-7Cm
3/ Nm; The hardness of the friction materials A1 that embodiment 1 obtains only is 65, and the hardness of the friction materials A7 that embodiment 7 obtains is 85, when having illustrated that the content that increases the magnetite powder described in the agent that rubs and average particle diameter are in scope of the present invention, remove the stability that can further improve the frictional coefficient under the friction materials high temperature, the wear rate under the high temperature of friction materials can also be reduced, the hardness of friction materials can be suitably reduced simultaneously.
From the data of last table 2 as can be seen, the hardness of the friction materials A1 that embodiment 1 obtains only is 65, and the hardness of the friction materials A9 that embodiment 9 obtains is 84, illustrated when containing the mixture of paracril and polyphenylene sulfide in the filler, can suitably reduce the hardness of friction materials, and can improve the stability under the high temperature of friction materials and reduce wear rate.
Claims (16)
1, a kind of friction material composition that is used to prepare brake facing, said composition contains tackiness agent, strongthener, increases the agent that rubs, lubricant and filler, it is characterized in that, and described tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin.
2, composition according to claim 1, wherein, gross weight with described composition is a benchmark, the content of described tackiness agent is 6-20 weight %, the content of described strongthener is 15-40 weight %, the described content that increases the agent that rubs is 10-30 weight %, and the content of described lubricant is 5-20 weight %, and the content of described filler is 15-40 weight %.
3, composition according to claim 2, wherein, gross weight with described composition is a benchmark, the content of described tackiness agent is 10-18 weight %, the content of described strongthener is 20-35 weight %, the described content that increases the agent that rubs is 15-25 weight %, and the content of described lubricant is 10-15 weight %, and the content of described filler is 20-35 weight %.
4, according to any described composition among the claim 1-3, wherein, described tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and be Powdered, the average particle diameter of described tackiness agent is the 40-75 micron, the described average particle diameter that increases the agent that rubs is the 25-77 micron, and the average particle diameter of lubricant is the 30-45 micron; The mean diameter of described strongthener is the 100-200 micron, and mean length is 0.1-0.4 centimetre; The average particle diameter of described filler is 80 nanometers to 45 micron.
5, composition according to claim 1 wherein, is a benchmark with the gross weight of tackiness agent, and the content of described cashew nut shell oil and paracril double-modification phenolic resin is not less than 40 weight %.
6, composition according to claim 1 or 5, wherein, described cashew nut shell oil and paracril double-modification phenolic resin are made by chemical process by cashew nut shell oil and paracril and resol, and the weight ratio of the consumption of cashew nut shell oil and paracril and resol is 0.04-0.1: 0.03-0.1: 1.
7, composition according to claim 6, wherein, tackiness agent also contains resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, in Resins, epoxy and the urethane resin one or more, gross weight with tackiness agent is a benchmark, resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, the polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, the total content of Resins, epoxy and urethane resin is greater than 0 to 60 weight %.
8, composition according to claim 1 or 5, wherein, described cashew nut shell oil and paracril double-modification phenolic resin are mixed by cashew nut oil modified alkyd resin and paracril, and wherein, the weight ratio of the consumption of cashew nut oil modified alkyd resin and paracril is 10-25.
9, composition according to claim 1, wherein, described strongthener is the mixture of steel fiber and mineral fibre and/or organic fibre, in strongthener, the weight ratio of steel fiber and mineral fibre and organic fibre total amount is 1-2.5; Described to increase the agent that rubs be in zinc oxide, magnesium oxide, aluminum oxide, magnetite powder, brass breeze, troilite powder, chromite powder, Feldspar Powder, ground dolomite and the zeolite powder one or more, and the content of Z 250 is more than the 80 weight % in the described magnetite powder; Described lubricant is one or more in synthetic graphite, metallic sulfide, crystalline flake graphite and the molybdenumdisulphide, and described metallic sulfide is one or more in zinc sulphide, antimony sulfide, cupric sulfide, the moly-sulfide; Described filler contains one or more in kaolin, wollastonite, ground barium sulfate, vermiculite power, mica powder and the cryolite powder, and the average particle diameter of kaolin, wollastonite, ground barium sulfate, vermiculite power, mica powder and cryolite powder is the 30-45 micron.
10, composition according to claim 9 wherein, describedly increases the agent that rubs and contains magnetite powder, is benchmark with the described gross weight that increases the agent that rubs, and the content of described magnetite powder is 20-50 weight %, and the average particle diameter of described magnetite powder is the 25-45 micron.
11, according to claim 9 or 10 described compositions, wherein, the content of Z 250 is more than the 94 weight % in the described magnetite powder.
12, composition according to claim 9, wherein, described filler also contains paracril and polyphenylene sulfide; Gross weight with composition is a benchmark, and the content of paracril is 1-10 weight %, and the content of polyphenylene sulfide is 1-10 weight %; Described paracril and polyphenylene sulfide are Powdered, and the average particle diameter of described paracril is the 80-150 nanometer, and the average particle diameter of described polyphenylene sulfide is the 30-45 micron.
13, composition according to claim 12 wherein, is a benchmark with the gross weight of composition, and the content of paracril is 2-7 weight %, and the content of polyphenylene sulfide is 2-8 weight %.
14, according to claim 12 or 13 described compositions, wherein, the content of acrylonitrile unit is 15-50 weight % in the described paracril, and the degree of crystallinity of described polyphenylene sulfide is 55-65%.
15, a kind of friction materials that is used to prepare brake facing, this friction materials is obtained by the hot-forming postheat treatment of a kind of friction material composition, it is characterized in that, and said composition is any described friction material composition among the claim 1-14.
16, friction materials according to claim 15, wherein, described hot-forming condition comprises that hot-forming temperature is 150-190 ℃, and hot-forming pressure is 20-28MPa, and the hot-forming time is 1-10 minute; Described heat treated condition comprises that heat treated temperature is 100-220 ℃, and heat treatment period is 5-15 hour.
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| CN117209910B (en) * | 2023-11-08 | 2024-03-29 | 陕西特种橡胶制品有限公司 | Shaft seal rubber for nuclear power main pump shaft and preparation method thereof |
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