CN101613516B - Friction material composition and friction material for preparing brake pad - Google Patents
Friction material composition and friction material for preparing brake pad Download PDFInfo
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- CN101613516B CN101613516B CN2008101268341A CN200810126834A CN101613516B CN 101613516 B CN101613516 B CN 101613516B CN 2008101268341 A CN2008101268341 A CN 2008101268341A CN 200810126834 A CN200810126834 A CN 200810126834A CN 101613516 B CN101613516 B CN 101613516B
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Abstract
The invention provides a friction material composition for preparing a brake pad. The composition contains binding agent, reinforced materials, friction increase agent, lubricating agent and filler, wherein the binding agent contains the binary modified phenolic resin of cashew nut shell oil and chemigum. The invention also provides a friction material for preparing the brake pad. The friction material is obtained in such a way that the friction material composition carries out heat treatment after being molded by hot press, wherein the friction material composition is provided by the invention. The friction material composition for preparing the brake pad can obviously improve the stability of the friction coefficient of the friction material.
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; Be made up of 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%, said mineral filler is selected from one or both in permanent white, the lime carbonate, and the said 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 at high temperature is unstable.
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 compsn and by the friction materials of this friction material composition preparation.
The invention provides a kind of compsn 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, said 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 post-heat-treated of a kind of friction material composition, and wherein, said composition is a friction material composition provided by the invention.
Data from table 1 can be found out; 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 explained 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, said tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin.
In the said compsn; Gross weight with said compsn is a benchmark, is benchmark with the gross weight of said compsn, and the content of said tackiness agent is 6-20 weight %; The content of said strongthener is 15-40 weight %; The said content that increases the agent that rubs is 10-30 weight %, and the content of said lubricant is 5-20 weight %, and the content of said filler is 15-40 weight %.Under the preferable case; Gross weight with said compsn is a benchmark; The content of said tackiness agent is 10-18 weight %, and the content of said strongthener is 20-35 weight %, and the said content that increases the agent that rubs is 15-25 weight %; The content of said lubricant is 10-15 weight %, and the content of said filler is 20-35 weight %.
Among the present invention; Said tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and be Powdered; The average particle diameter of said tackiness agent can be the 40-75 micron, and the said 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 said strongthener can be the 100-200 micron, and mean length can be 0.1-0.4 centimetre; The average particle diameter of said filler can be 80 nanometers to 45 micron.
Among the present invention, be benchmark with the gross weight of tackiness agent, the content of said 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 through chemistry or physical method (for example copolymerization or mechanically mixing) modification with a kind of different compounds or polymkeric substance; Double-modification phenolic resin is meant the resol that makes through 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 property etc. can be improved.Said cashew nut shell oil and paracril double-modification phenolic resin are meant the resol that makes through chemistry (for example copolymerization) or physical method (for example mechanically mixing) modification with cashew nut shell oil and paracril.Preferred said 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 through chemical process, can further improve the stability of the frictional coefficient of friction materials through this preferred implementation;
When adopting chemical process to prepare cashew nut shell oil and paracril double-modification phenolic resin; The condition that said 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 said cashew nut shell oil and paracril double-modification phenolic resin make through chemical process; Except that cashew nut shell oil and paracril double-modification phenolic resin; Said tackiness agent can also contain one or more in resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and the urethane resin; Gross weight with tackiness agent is a benchmark, and the total content of resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and urethane resin is greater than 0 to 60 weight %.
When said cashew nut shell oil and paracril double-modification phenolic resin are prepared by physical method; Can make through 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, and said cashew nut oil modified alkyd resin can be commercially available, and 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 through chemical process, and wherein the weight ratio of the consumption of cashew nut shell oil and resol can be 5-15: 100.
When said cashew nut shell oil and paracril double-modification phenolic resin make through physical method; Except that cashew nut shell oil and paracril double-modification phenolic resin; Said tackiness agent can also contain one or more in resol, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and the urethane resin; Gross weight with tackiness agent is a benchmark, and the total content of resol, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and urethane resin is greater than 0 to 60 weight %.
In the compsn provided by the invention, said 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.
Said steel fiber can be the combination of steel fiber A and steel fiber B; Said steel fiber A can be steel fiber and/or iron fiber, and said steel fiber B can be copper fiber and/or aluminum fiber, in the said 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 said steel fiber B is the 35-55 weight part.
The kind of said mineral fibre and organic fibre is conventionally known to one of skill in the art, and for example, said 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; Said organic fibre can be aramid fiber and/or aramid pulp.
Saidly 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, Natural manganese dioxide, 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, saidly increasing the agent that rubs and contain magnetite powder, is benchmark with the said gross weight that increases the agent that rubs, and the content of said magnetite powder is 20-50 weight %, and the average particle diameter of said 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 said 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 said magnetite powder; Among the present invention; The content that uses Z 250 is that the above magnetite powder of 80 weight % can be realized the object of the invention; But the content of Z 250 is more than the 94 weight % in the preferred said magnetite powder; According to this preferred implementation, can further improve the stability of the frictional coefficient under the friction materials high temperature, can further reduce the hardness of the wear rate and the friction materials of friction materials simultaneously.The content of said Z 250 is that the above magnetite powder of 94 weight % also can be commercially available.
Said 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, said metallic sulfide is one or more in zinc sulphide, ANTIMONY SULPHIDE, cupric sulfide, the moly-sulfide.
Said 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, said filler also contains paracril and polyphenylene sulfide; Gross weight with compsn 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 said paracril and polyphenylene sulfide are Powdered, and the average particle diameter of said paracril can be the 80-150 nanometer, and the average particle diameter of said polyphenylene sulfide can be the 30-45 micron.Said paracril is one type of viton that divinyl and vinyl cyanide make through letex polymerization.The content of acrylonitrile unit can be 15-50 weight % in the said 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 percent crystallinity of said polyphenylene sulfide can be 55-65%.Said 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 bright polyphenylene sulfide (average particle diameter is 45 microns, and percent crystallinity is 60%) that gathers the PPS-HA2 of plastic cement ltd model.
The present invention has no particular limits said preparation of compositions method, as long as with tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and mix.Corresponding component is identical in the kind of each component that when mixing, adds and the preceding text, this no longer deposited stating.Said 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; Said blended condition comprises that mixing temperature can be 0-30 ℃, and 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 post-heat-treated of a kind of friction material composition, and wherein, said composition is a friction material composition provided by the invention.
Said 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 ltd produces hot-forming; Said hot-forming condition comprises that hot-forming temperature is 150-190 ℃, and hot-forming pressure is 20-28MPa, and the hot-forming time is 5-10 minute.
Said 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 ltd produces and heat-treat; Also can directly in thermocompressor, continue to heat-treat, should transfer to 0 this moment with the pressure that heat adds machine.Said 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 said 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 ℃.
Come to describe in more detail the present invention through embodiment below.
Embodiment 1
This embodiment is used to explain 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 (steel fiber ltd greatly just, D1-80; Mean diameter is 150 microns; Mean length is 0.3 centimetre), (mean diameter is 150 microns for big positive steel fiber ltd, DT1-99 for the copper fiber of 5 weight parts; Mean length is 0.3 centimetre), the composite mineral wool of 10 weight parts (smelting mining industry ltd; Mean diameter is 100 microns, and mean length is 0.4 centimetre), the content of the Z 250 of 12 weight parts is that the chromite powder of the magnetite powder of 94 weight % (prosperous excessive mineral products ltd, average particle diameter is 35 microns), 6 weight parts (is contained safe chemical industry ltd; Average particle diameter is 45 microns), the zeolite powder of 6 weight parts (contains safe chemical industry ltd; Average particle diameter is 25 microns), (VP-402 of Beijing Chemical Research Institute company model, average particle diameter are 90 nanometers for the paracril of the ANTIMONY SULPHIDE of the crystalline flake graphite of 6 weight parts (day contain graphite ltd, average particle diameter is 40 microns), 6 weight parts (contain safe chemical industry ltd, average particle diameter is 40 microns), 5 weight parts; The content of vinyl cyanide is 40 weight % in the paracril), the polyphenylene sulfide of 5 weight parts (brightly gather the PPS-HA0 of plastic cement ltd model, average particle diameter is 40 microns; Percent crystallinity is 65%) and the ground barium sulfate of 15 weight parts (containing safe chemical industry ltd, 40 microns of average particle diameters) put into the JF810SJ type pears rake formula mixer that electromechanical equipment institute of Jilin University produces and mix, said 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 compsn 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 ltd; The XL100 type) carry out hot-forming in the metal die; Said 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 ltd; The 702A type) heat-treat in, said 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 explain the friction material composition and the friction materials that are used to prepare brake facing of reference.
According to preparing friction material composition and the friction materials AC1 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; Resol (holy well chemical industry ltd 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 explain the friction material composition and the friction materials that are used to prepare brake facing of reference.
According to preparing friction material composition and the friction materials AC2 that is used to prepare brake facing respectively with embodiment 1 identical method; 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 explain 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 ltd, PF6400-A; Average particle diameter is 40 microns), the iron fiber of 10 weight parts (big positive steel fiber ltd; Mean diameter is 100 microns, and mean length is 0.1 centimetre), the aluminum fiber of 8 weight parts (big positive steel fiber ltd, DA-#000; Mean diameter is 100 microns; Mean length is 0.2 centimetre), the content of the Z 250 of the ca silicate fibre of 17 weight parts (prosperous excessive mineral products ltd, mean diameter is 100 microns, mean length is 0.2 centimetre), 4 weight parts is the magnetite powder of 94 weight % (prosperous excessive mineral products ltd; Average particle diameter is 25 microns), the troilite powder of 10 weight parts (prosperous excessive mineral products ltd; Average particle diameter is 30 microns), the ANTIMONY SULPHIDE of the crystalline flake graphite of the zeolite powder of 6 weight parts (contain safe chemical industry ltd, average particle diameter is 30 microns), 5 weight parts (day contain graphite ltd, average particle diameter is 30 microns), 10 weight parts (contains safe chemical industry ltd; Average particle diameter is 30 microns), (VP-412 of Beijing Chemical Research Institute company model, average particle diameter are 110 nanometers for the paracril of 2 weight parts; The content of vinyl cyanide is 26 weight % in the paracril), the ground barium sulfate of the kaolin of the polyphenylene sulfide of 2 weight parts (brightly gather the PPS-HA1 of plastic cement ltd model, average particle diameter is 30 microns, percent crystallinity is 55%), 10 weight parts (contain safe chemical industry ltd, average particle diameter is 30 microns) and 6 weight parts (contains safe chemical industry ltd; 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; Said blended condition comprises that mixing temperature is 20 ℃, and mixing time is 15 minutes, and the friction material composition that obtains being used to preparing brake facing is used for the compsn 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 ltd; The XL100 type) carry out hot-forming in the metal die; Said 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 ltd then; The 702A type) heat-treats in; Said 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 explain 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-cashew nut shell oil double-modification phenolic resin of 2 weight parts (the strong resin ltd of China 5160 models, average particle diameter is 75 microns), 3 parts by weight of epoxy resin (holy well chemical industry ltd, PF6400-A; Average particle diameter is 40 microns), resol (the holy well chemical industry ltd of 5 weight parts; PF6000, average particle diameter are 75 microns), the iron fiber of 7 weight parts (big positive steel fiber ltd, mean diameter is 200 microns; Mean length is 0.4 centimetre), the aluminum fiber of 8 weight parts (big positive steel fiber ltd; 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 ltd; Mean diameter is 100 microns; Mean length is 0.2 centimetre), the content of the Z 250 of 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 weight parts is the magnetite powder of 96 weight % (prosperous excessive mineral products ltd; Average particle diameter is 45 microns), the troilite powder of 10.4 weight parts (prosperous excessive mineral products ltd; Average particle diameter is 30 microns), the ANTIMONY SULPHIDE of the zinc sulphide of the crystalline flake graphite of 5 weight parts (day contain graphite ltd, average particle diameter is 30 microns), 2 weight parts (contain safe chemical industry ltd, average particle diameter is 45 microns), 3 weight parts (contains safe chemical industry ltd; Average particle diameter is 30 microns), (VP-402 of Beijing Chemical Research Institute company model, average particle diameter are 90 nanometers for the paracril of 7 weight parts; The content of vinyl cyanide is 40 weight % in the paracril), the ground barium sulfate of the kaolin of the polyphenylene sulfide of 8 weight parts (brightly gather the PPS-HA2 of plastic cement ltd model, average particle diameter is 45 microns, percent crystallinity is 60%), 10 weight parts (contain safe chemical industry ltd, average particle diameter is 30 microns) and 10 weight parts (contains safe chemical industry ltd; 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; Said blended condition comprises that mixing temperature is 20 ℃, and mixing time is 15 minutes, and the friction material composition that obtains being used to preparing brake facing is used for the compsn 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 ltd; The XL100 type) carry out hot-forming in the metal die; Said 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 in this thermocompressor, to heat-treat, said 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 explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A4 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; Said 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; Preparation is during cashew nut oil modified alkyd resin, and 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 explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A5 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; Said 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 ltd model; Average particle diameter is 60 microns; Preparation is during cashew nut oil modified alkyd resin, and 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 explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A6 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; Said 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 ltd model; Average particle diameter is 60 microns; Preparation is during cashew nut oil modified alkyd resin, and 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 explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A7 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; The content that uses the Z 250 of 12 weight parts is magnetite powder (the prosperous excessive mineral products ltd 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 ltd, average particle diameter is 35 microns) of 94 weight %.
Embodiment 8
This embodiment is used to explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A8 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; The content that uses the Z 250 of 12 weight parts is magnetite powder (the prosperous excessive mineral products ltd 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 ltd, average particle diameter is 35 microns) of 94 weight %.
Embodiment 9
This embodiment is used to explain friction material composition and the friction materials that is used to prepare brake facing provided by the invention.
According to preparing friction material composition and the friction materials A9 that is used to prepare brake facing respectively with embodiment 1 identical method; Different is; Wollastonite (Kingsoft wollastonite ltd 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 of 5 weight parts (brightly gather the PPS-HA0 of plastic cement ltd model, average particle diameter is 40 microns, percent crystallinity is 65%).
Embodiment 10-18
This embodiment is used to explain 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 explain 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 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 |
Can find out from the data of last table 1; 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 explained 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, has explained and has 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.
Can find out that from the data of last table 1 and table 2 when in temperature is 100-350 ℃ scope, changing, 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 is merely 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 is merely 65; And the hardness of the friction materials A7 that embodiment 7 obtains is 85; When having explained that the content that increases the magnetite powder described in the agent that rubs and average particle diameter are in scope according to the invention; Remove the stability can further improve the frictional coefficient friction materials high temperature under, can also reduce the wear rate under the high temperature of friction materials, the while can suitably be reduced the hardness of friction materials.
Can find out from the data of last table 2; The hardness of the friction materials A1 that embodiment 1 obtains is merely 65; And the hardness of the friction materials A9 that embodiment 9 obtains is 84; Explained and suitably to have reduced the hardness of friction materials when containing the mixture of paracril and polyphenylene sulfide in the filler, and can improve the stability under the high temperature of friction materials and reduce wear rate.
Claims (15)
1. 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; Said tackiness agent contains cashew nut shell oil and paracril double-modification phenolic resin, and said filler contains paracril and polyphenylene sulfide, is benchmark with the gross weight of compsn; The content of paracril is 1-10 weight %; The content of polyphenylene sulfide is 1-10 weight %, is benchmark with the gross weight of said compsn, and the content of said tackiness agent is 6-20 weight %; The content of said strongthener is 15-40 weight %; The said content that increases the agent that rubs is 10-30 weight %, and the content of said lubricant is 5-20 weight %, and the content of said filler is 15-40 weight %.
2. compsn according to claim 1; Wherein, be benchmark with the gross weight of said compsn, the content of said tackiness agent is 10-18 weight %; The content of said strongthener is 20-35 weight %; The said content that increases the agent that rubs is 15-25 weight %, and the content of said lubricant is 10-15 weight %, and the content of said filler is 20-35 weight %.
3. compsn according to claim 1 and 2; Wherein, Said tackiness agent, strongthener, increase the agent that rubs, lubricant and filler and be Powdered; The average particle diameter of said tackiness agent is the 40-75 micron, and the said 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 said strongthener is the 100-200 micron, and mean length is 0.1-0.4 centimetre; The average particle diameter of said filler is 80 nanometers to 45 micron.
4. compsn according to claim 1 wherein, is a benchmark with the gross weight of tackiness agent, and the content of said cashew nut shell oil and paracril double-modification phenolic resin is not less than 40 weight %.
5. according to claim 1 or 4 described compsns; Wherein, Said cashew nut shell oil and paracril double-modification phenolic resin are made through 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.
6. compsn according to claim 5; Wherein, Tackiness agent also contains one or more in resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and the urethane resin; Gross weight with tackiness agent is a benchmark, and the total content of resol, cashew nut oil modified alkyd resin, boron modified phenolic resin, polyamide modified resol, dicyandiamide modified resol, epoxy modified phenolic resin, polyvinyl acetal modified phenolic resins, trimeric cyanamide-cashew nut shell oil double-modification phenolic resin, epoxy resin and urethane resin is greater than 0 to 60 weight %.
7. according to claim 1 or 4 described compsns; Wherein, Said 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.
8. compsn according to claim 1, wherein, said 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; Said to increase the agent that rubs be in zinc oxide, Natural manganese dioxide, 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 said magnetite powder; Said lubricant is one or more in synthetic graphite, metallic sulfide, crystalline flake graphite and the molybdenumdisulphide, and said metallic sulfide is one or more in zinc sulphide, ANTIMONY SULPHIDE, cupric sulfide, the moly-sulfide; Said 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.
9. compsn according to claim 8 wherein, saidly increases the agent that rubs and contains magnetite powder, is benchmark with the said gross weight that increases the agent that rubs, and the content of said magnetite powder is 20-50 weight %, and the average particle diameter of said magnetite powder is the 25-45 micron.
10. according to Claim 8 or 9 described compsns, wherein, the content of Z 250 is more than the 94 weight % in the said magnetite powder.
11. compsn according to claim 8, wherein, said paracril and polyphenylene sulfide are Powdered, and the average particle diameter of said paracril is the 80-150 nanometer, and the average particle diameter of said polyphenylene sulfide is the 30-45 micron.
12. compsn according to claim 11 wherein, is a benchmark with the gross weight of compsn, the content of paracril is 2-7 weight %, and the content of polyphenylene sulfide is 2-8 weight %.
13. according to claim 11 or 12 described compsns, wherein, the content of acrylonitrile unit is 15-50 weight % in the said paracril, the percent crystallinity of said polyphenylene sulfide is 55-65%.
14. a friction materials that is used to prepare brake facing, this friction materials is obtained by the hot-forming post-heat-treated of a kind of friction material composition, it is characterized in that, said composition is any described friction material composition among the claim 1-13.
15. friction materials according to claim 14, wherein, said 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; Said heat treated condition comprises that heat treated temperature is 100-220 ℃, and heat treatment period is 5-15 hour.
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