CN101759862A - Method for preparing nanoparticle-modified friction material - Google Patents
Method for preparing nanoparticle-modified friction material Download PDFInfo
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- CN101759862A CN101759862A CN200910155354A CN200910155354A CN101759862A CN 101759862 A CN101759862 A CN 101759862A CN 200910155354 A CN200910155354 A CN 200910155354A CN 200910155354 A CN200910155354 A CN 200910155354A CN 101759862 A CN101759862 A CN 101759862A
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Abstract
The invention discloses a method for preparing a nanoparticle-modified friction material, which comprises the following steps: dissolving a resin in a solvent to obtain solution of the resin, uniformly dispersing nanoparticles in the solution of the resin, soaking reinforcing fibers in the solution and adding surfactant to allow the resin, the nanoparticles and the reinforcing fibers to be tightly bonded and uniformly disperse; and mixing the resin-coated nanoparticles and the resin-coated reinforcing fibers with a friction performance regulator and a filler, uniformly stirring the mixture and drying the mixture. In the method, the flowability of the solution of the resin is used to coat the nanoparticles and the reinforcing fibers, so the uniform mixing of the nanoparticles, the fibers and the resin is realized; the bonding strength of the nanoparticles, the fibers and the resin is increased under the action of the surfactant; and the friction performance and the service life of a brake pad can be improved on the basis of reducing the dosages of the nanoparticles, the reinforcing fibers and the resin. The friction material of the invention can be widely used in the preparation of brake pads of motor vehicles, brakes of machine tools and electrodes, clutch liners and the like.
Description
Technical field
The present invention relates to method for preparing friction, in particular for method for preparing friction such as the stopper of motor vehicle brake-shoe, lathe and electrode, clutch facings.
Background technology
Automobile brake is commonly called as brake facing with friction materials, is one of most important safety component in the brake system of car, is concerning automobile driver's safety of life and property.The preparation of brake facing is starting material with resin, fortifying fibre, frictional property regulator and filler etc. generally, by behind the uniform mixing through hot pressing, make after solidifying.Traditional brake facing mainly is wild phase with the fibrous magnesium silicate, after finding that asbestos are a kind of important carcinogenic substance, the semimetal friction material that with the steel fiber is wild phase has obtained fast development, be widely used at present the braking of various types of vehicles, but there is the shortcoming of easy-to-rust in semimetal friction material, be the decline that improves frictional behaviour, avoids semimetal friction material to bring braking ability because of the steel fiber corrosion, slag fibre, aramid fiber, ceramic fiber, carbon fiber etc. are applied gradually.
In recent years, for improving the friction and wear behavior of brake facing, the nano friction material has obtained extensive concern; By sneaking into of nanoparticle, the micro interface structure of friction material constituents is significantly improved, can effectively improve its heat fading and hot restorability.Guan Qiang proposed in the 8th phase of " mechanical engineer " calendar year 2001 " the nano friction material market has a extensive future ", nano effect by control different shape multi-phase ingredients, the nano friction material is obtained than existing friction materials comprehensive performance, particularly can improve its high temperature friction and polishing machine taking into account intensity and flexible simultaneously.Xu Songbo discloses a kind of brake facing prescription and preparation method who adds nano modification resin and nano-calcium carbonate powder in application number is 200510041355.6 Chinese patent, U.S. BorgWarner Inc discloses the friction materials of modified Nano particle layers such as a kind of nano carbon particle and silica dioxide granule in application number is 200510098049.6 Chinese patent.
Yet the researchist finds, introduces nano-powder with traditional dry method batch mixing and can not farthest bring into play the modifying function of nano particle to friction materials, can occur some negative influences on the contrary.Chen Dong is at " nano SiC is to the semimetal friction material Effect on Performance " and " the nanometer CaCO of " mechanical engineering material " 2005 the 2nd phase 48-51 pages or leaves of " modern Manufacturing Engineering " 2005 the 4th phase 71-74 pages or leaves
3The semimetal friction material Study on Friction and Wear " no matter middle the discovery is to replace common SiC powder with nano SiC, still with nanometer CaCO
3Replace common CaCO
3Powder, can cause all that nanoparticle sticks on other particles and the steel fiber surface in the batch mixing process, reduce the bonding strength between resin material and other material, thereby cause in friction process, the rubbing factor of friction materials is less than normal, and wear rate increases greatly.
Summary of the invention
The objective of the invention is at utilizing at present among the nanoparticle-modified friction material preparation technology, the starting material that exist mix inequality, resin combines not strong with nano particle and fortifying fibre, the shortcoming that causes frictional behaviour to descend thus, provide a kind of being beneficial to improve nano particle uniformly dispersed in friction materials, improve the method for resin and nano particle and fortifying fibre bonding strength simultaneously.
The preparation method of the nanoparticle-modified friction material that the present invention proposes may further comprise the steps:
1) 5～15 parts of resins and 0.05～5 part of resin curing agent are dissolved in the solvent, add 0.05～5 part of tensio-active agent simultaneously, stir, get resin solution;
2) 0.1～10 part of nano particle is put into solvent, add 0.01～0.5 part of tensio-active agent simultaneously, stir, get the aaerosol solution of nano particle;
3) aaerosol solution with above-mentioned nano particle joins in the resin solution, stirs, and must suspend to be distributed with the resin solution of nano particle;
4) 20～50 parts of fortifying fibres are immersed in above-mentioned suspension and are distributed with in the resin solution of nano particle, mix, obtain being distributed with the resin solution of nano particle, fortifying fibre;
5) in the above-mentioned resin solution that is distributed with nano particle, fortifying fibre, add 30～70 parts of frictional property regulators and filler, mix, under 80～120 ℃ temperature dry 3～24 hours then; The resin solution that perhaps will be distributed with nano particle, fortifying fibre earlier under 80～120 ℃ temperature dry 3～24 hours, again with 30～70 parts of frictional property regulators and filler mixing and stirring, obtain friction materials, above-mentioned umber all is basis with weight.
Among the present invention, said resin can be one or more in resol, boron modified phenolic resin, cyanurotriamide modified resol and the aralkyl modified phenolic resins.
Said resin curing agent can be one or more in hexamethylenetetramine, sulphur and the urotropine.
Said solvent can be one or more in dehydrated alcohol, acetone, dimethylbenzene, ethyl acetate, acetate butyl and the water.
Said tensio-active agent can be one or more in silane coupling agent, Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, sodium polyacrylate, sodium methylene bis-naphthalene sulfonate, oleic acid, the polyoxyethylene glycol.
Said nano particle can be one or more in nano aluminium oxide, nano-silicon lime stone, nanometer mussite, nano-calcium carbonate, nano silicon, the nanometer silicon carbide.
Said fortifying fibre can be one or more in asbestos, steel fiber, slag fibre, glass fibre, aramid fiber, ceramic fiber and the carbon fiber.
Said frictional property regulator and filler can be one or more in molybdenumdisulphide, talcum, mica, tin chloride, graphite, barite, wollastonite, vermiculite, tyre talc, aluminum oxide and the silicon powder.
The present invention has following beneficial effect:
Preparation technology of the present invention is simple, utilize the mobile encapsulated nanoparticles and the fortifying fibre of resin solution, realized the uniform mixing of nano particle, fiber and resin, and under the effect of tensio-active agent, strengthen its bonding strength, can reduce the consumption of nano particle, fortifying fibre and resin, reduce production costs; Simultaneously, can avoid nano particle and fortifying fibre in braking procedure, to be extracted by frictional force, be beneficial to the frictional behaviour and the work-ing life of improving brake facing, particularly for the modifying function of performance nano particle, the heat fading and the hot restorability that improve friction materials are significant.Friction materials of the present invention can be widely used in stopper, clutch facing of prepare automotive brake facing, lathe and electrode etc.
Embodiment
Below in conjunction with example the present invention is further described.
Example 1:
Take by weighing 0.05 part of 5 parts in resol and hexamethylenetetramine, be dissolved in the mixing solutions of industrial spirit and dimethylbenzene, add 0.5 part of silane coupling agent simultaneously, get resin solution after stirring; Take by weighing 2 parts of nano aluminium oxides and 1 part of nano silicon is put into industrial spirit, add 0.05 part of polyoxyethylene glycol simultaneously, pour in the resin solution mixing and stirring after stirring into; In above-mentioned mixing solutions, add 15 parts of aramid fibers and 5 parts of steel fibers then, stir the back and add 1.5 parts of molybdenumdisulphide, 4 parts of graphite, 16 parts of barites, 5 parts of wollastonites, 4 parts of tyre talcs.With after the above-mentioned matrix material mixing and stirring in 90 ℃ baking oven dry 24 hours, friction materials.
Example 2:
Take by weighing 0.15 part of 10 parts of boron modified phenolic resins and urotropine, be dissolved in the mixing solutions of industrial spirit and acetone, add 0.8 part of Sodium dodecylbenzene sulfonate simultaneously, get resin solution after stirring; Take by weighing 3 parts of nano-calcium carbonates and 2 parts of nanometer silicon carbides are put into acetone soln, add 0.1 part of oleic acid simultaneously, pour in the resin solution mixing and stirring after stirring into; In above-mentioned mixing solutions, add 5 parts of steel fibers and 8 parts of slag fibres and 10 parts of asphalt-based carbon fibers then, stir the back and add 3.5 parts of molybdenumdisulphide, 7 parts of graphite, 30 parts of barites, 10 parts of wollastonites, 10 parts of tyre talcs.With after the above-mentioned matrix material mixing and stirring in 120 ℃ baking oven dry 8 hours, friction materials.
Example 3:
Take by weighing 0.2 part of 15 parts in cyanurotriamide modified resol, 0.5 part of hexamethylenetetramine and urotropine, be dissolved in the mixing solutions of industrial spirit and ethyl acetate, add 0.1 part of sodium polyacrylate and 0.2 part of sodium lauryl sulphate simultaneously, get resin solution after stirring; Take by weighing 5 parts of nano-silicon lime stones and 2 parts of nano-calcium carbonates are put into industrial spirit, add 0.1 part of polyoxyethylene glycol simultaneously, pour in the resin solution mixing and stirring after stirring into; Add 10 parts of steel fibers and 20 parts of asphalt-based carbon fibers then in above-mentioned mixing solutions, back drying 12 hours in 100 ℃ baking oven stirs.In above-mentioned process exsiccant matrix material, add 5 parts of molybdenumdisulphide, 15 parts of graphite, 30 parts of barites, 10 parts of aluminum oxide, 10 parts of tyre talcs, get friction materials after the mixing and stirring.
Example 4:
Take by weighing 10 parts of aralkyl modified phenolic resinss, 0.3 part of hexamethylenetetramine, be dissolved in the mixing solutions of industrial spirit and acetate butyl, add 0.2 part of sodium lauryl sulphate and 0.05 part of sodium methylene bis-naphthalene sulfonate simultaneously, get resin solution after stirring; Take by weighing 4 parts of nano-calcium carbonates and 2 parts of nanometer mussites are put into industrial spirit, add 0.05 part of polyoxyethylene glycol and 0.05 part of oleic acid simultaneously, pour in the resin solution mixing and stirring after stirring into; In above-mentioned mixing solutions, add 5 parts of glass fibre, 5 parts of aramid fibers and 20 parts of asphalt-based carbon fibers then, after the mixing and stirring in 110 ℃ baking oven drying 10 hours.In above-mentioned process exsiccant matrix material, add 2 parts of molybdenumdisulphide, 12 parts of graphite, 28 parts of barites, 12 parts of aluminum oxide, 6 parts of tyre talcs, get friction materials after the mixing and stirring.
The friction materials that makes in the above-mentioned example is pressed into base substrate, and mold pressing 15 minutes under 160 ℃, the pressure of 20MPa then promptly obtained the brake facing finished product in 10 hours 180 ℃ of following thermal treatments again.The above-mentioned brake facing finished product that makes according to standard GB 5763-1998, is tested the frictional coefficient and the wear rate of product of the present invention on constant speed formula frictional testing machines, concrete test result is as shown in the table:
As can be seen from the above table, the rising of the The friction coefficient temperature of product of the present invention does not have to change substantially, illustrates that its resistance toheat is good and stable; The wear rate of product of the present invention is far smaller than the national standard requirement, and change little with the temperature rising, illustrate that the present invention utilizes resin solution encapsulated nanoparticles and fortifying fibre, and utilize tensio-active agent to strengthen the bonding strength of resin and nano particle and fortifying fibre, can effectively bring into play the modifying function of nano particle, improve the heat fading and the hot restorability of friction materials.
Claims (4)
1. the preparation method of a nanoparticle-modified friction material is characterized in that comprising the steps:
1) 5～15 parts of resins and 0.05～5 part of resin curing agent are dissolved in the solvent, add 0.05～5 part of tensio-active agent simultaneously, stir, get resin solution;
2) 0.1～10 part of nano particle is put into solvent, add 0.01～0.5 part of tensio-active agent simultaneously, stir, get the aaerosol solution of nano particle;
3) aaerosol solution with above-mentioned nano particle joins in the resin solution, stirs, and must suspend to be distributed with the resin solution of nano particle;
4) 20～50 parts of fortifying fibres are immersed in above-mentioned suspension and are distributed with in the resin solution of nano particle, mix, obtain being distributed with the resin solution of nano particle, fortifying fibre;
5) in the above-mentioned resin solution that is distributed with nano particle, fortifying fibre, add 30～70 parts of frictional property regulators and filler, mix, under 80～120 ℃ temperature dry 3～24 hours then; The resin solution that perhaps will be distributed with nano particle, fortifying fibre earlier under 80～120 ℃ temperature dry 3～24 hours, again with 30～70 parts of frictional property regulators and filler mixing and stirring, obtain friction materials, above-mentioned umber all is basis with weight;
Above-mentioned resin is one or more in resol, boron modified phenolic resin, cyanurotriamide modified resol and the aralkyl modified phenolic resins; Described resin curing agent is one or more in hexamethylenetetramine, sulphur and the urotropine; Described solvent is one or more in dehydrated alcohol, acetone, dimethylbenzene, ethyl acetate, acetate butyl and the water; Described tensio-active agent is one or more in silane coupling agent, Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, sodium polyacrylate, sodium methylene bis-naphthalene sulfonate, oleic acid, the polyoxyethylene glycol.
2. the preparation method of nanoparticle-modified friction material according to claim 1 is characterized in that described nano particle is one or more in nano aluminium oxide, nano-silicon lime stone, nanometer mussite, nano-calcium carbonate, nano silicon, the nanometer silicon carbide.
3. the preparation method of nanoparticle-modified friction material according to claim 1 is characterized in that described fortifying fibre is one or more in asbestos, steel fiber, slag fibre, glass fibre, aramid fiber, ceramic fiber and the carbon fiber.
4. the preparation method of nanoparticle-modified friction material according to claim 1 is characterized in that described frictional property regulator and filler are one or more in molybdenumdisulphide, talcum, mica, tin chloride, graphite, barite, wollastonite, vermiculite, tyre talc, aluminum oxide and the silicon powder.
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- 2009-12-21 CN CN200910155354A patent/CN101759862A/en active Pending
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