CN103541267B - A kind of preparation method of rare earth modified paper friction material - Google Patents
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Abstract
A preparation method for rare earth modified paper friction material, is dissolved in cashew nut oil modified alkyd resin in absolute ethyl alcohol and obtains solution A; Multi-walled carbon nano-tubes is dispersed in sodium dodecyl sulfate aqueous solution and obtains suspension B; The nitrate solution of rare earth element is joined in suspension B and obtains suspension C; Chopped carbon fiber, bamboo fibre and diatomite are dispersed in water and add suspension C again and obtain solution D; Solution D is discongested rear handsheet and drying obtains print; Take out after print being impregnated in solution A and dry, hot-forming, namely obtain rare earth modified paper friction material.Rare earth elements of the present invention is fully combined with CNT, play a role as a whole, prepare single-part stationery base frication material, technique is simple and easy to control, overcome the friction material surface out-of-flatness prepared by prior art, each component interface cohesion is insecure and frictional behaviour is unstable problem, substantially increase the frictional behaviour of paper friction material, effectively reduce wear rate.
Description
Technical field
The invention belongs to friction material field, relate to a kind of preparation method of modified paper base frication material, particularly a kind of preparation method of rare earth modified paper friction material.
Background technology
Wet-type friction material refers to work in the friction material in lubricant medium (mainly lubricating oil), be mainly used in [P.Marklund in the actuation in wet oiling condition systems such as automatic transmission, differential mechanism, torque management device and synchronized, R.Larsson.Tribology International, 2008,41:824 – 830.].Because service condition is different, the speed of transmission system, pressure and load difference are very large, certain material single is difficult to meet all operating mode instructions for uses, thus develop multiple Wet-type friction material, mainly comprise cork-rubber base frication material, powder metallurgy friction material, paper friction material and carbon/carbon compound material etc.
Paper friction material is primarily of compositions such as fiber, binding agent, filler, frictional property regulators, the mode of usual employing papermaking is manufactured, and [appoints just, Deng Haijin so be called " paper substrate " friction material, Li Ming. automotive engineering, 2004 (11): 1-4.].Due to its have that coefficient of friction is high, stable friction performance, static and dynamic friction coefficient be than many premium properties such as adjustable, abrasion resistance properties is good, energy absorption capability is high and in the wet clutch of be widely used all kinds of heavy vehicle and engineering machinery and brake, particularly as the friction plate material of wet clutch in automatic gearbox.Along with vehicle is to future developments such as high speed, heavy load, light pollutions, higher requirement be it is also proposed to the development of paper base material, researchers have made some effort and effect [Kim S J at paper base material the Nomenclature Composition and Structure of Complexes design aspect, Cho M H, Lim D S, et al.Wear, 2001, (251): 1484 ~ 1491].Rare earth element electronegativity is low, easily forms enrichment at friction surface.Rare earth urges to carbo-nitriding the effect of oozing, make infiltration layer show fabulous wear-resisting erosion resistance [Xue Maoquan, Xiong Dangsheng, Yan Jie. the tribology research [J] of Rare Earth Lubricating Materials. rare metal, 2004,28 (1): 248-251].Add rare earth compound in the polymer, can significantly improve its physical and mechanical properties and ABRASION RESISTANCE.[Xiong Dangsheng, Chen Lei, the Wang Zhenzhong .La such as Xiong Dangsheng
2o
3fill the friction and wear behavior [J] of PA1010 composite. China YouSe Acta Metallurgica Sinica, 2001,11 (4): 611-615] friction and wear behavior of the 1010 Composites containing different rare earth compound has been investigated, think that rare earth compound produces in friction process decompose and friction chemical reaction occurs, strengthen the adhesion between transfer membrane and couple surface, thus improve the ABRASION RESISTANCE of composite.Xue Yujun, Cheng Xianhua [Xue Y J, Cheng X H.Tensile properties of glass fiber reinforced PTFE using arare-earth surface modifier [J] .Journal of Materials Science Letters, 2001, 20 (18): 1729-1731] have studied the impact of rare-earth surface modification on Glass Fiber Reinforced PTFE Composites tribological property, result of study finds best by the anti-wear performance of rare earth modified glass fibre Filled PTEF composite, coefficient of friction and friction surface temperature minimum, mainly based on adhesion and slight abrasive wear, RE-treated adds the bond properties between glass fibre and polymer, changes the phase structure of material internal.At present, about extensive work has been carried out in the characteristic of rare earth compound and the application study in tribology thereof, and obtain certain progress, but also there are some problem values and must further investigate.Such as, except glass fibre, rare earth carries out the effect of surface modification treatment to other inorfils; Rare earth surface treatment strengthens the mechanism of action at polymer matrix composites interface to inorfil; Rare earth improves the mechanism etc. of composite tribological property.Rare earth compound is not also applied in paper friction material simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of rare earth modified paper friction material, the method technique is simple and easy to control, can improve the frictional behaviour of paper friction material by adding rare earth element.
For achieving the above object, the technical solution used in the present invention comprises the following steps:
Step one: be dissolved in by the cashew nut oil modified alkyd resin of every 0.7g ~ 3.0g in the absolute ethyl alcohol of every 50 ~ 100mL, obtain phenol resin solution, leaves standstill, and sealing is preserved, and obtains solution A;
Step 2: be dispersed in by the multi-walled carbon nano-tubes of every 0.5 ~ 8g in the sodium dodecyl sulfate aqueous solution of every 100 ~ 500mL, is stirred to multi-walled carbon nano-tubes and is uniformly dispersed, and obtains suspension B; The mass concentration adding 50 ~ 100mL again in the suspension B of every 100 ~ 500mL is the nitrate solution of the rare earth element of 1% ~ 4%, obtains suspension C;
Step 3: the diatomite adding the chopped carbon fiber of 6 ~ 14g, the bamboo fibre of 5 ~ 12g and 1 ~ 5g in the water of every 50 ~ 100mL, be uniformly dispersed, obtain mixed solution, again suspension C is joined in mixed solution and obtain solution D, when wherein often adding 6 ~ 14g chopped carbon fiber, add 80 ~ 400g suspension C;
Step 4: solution D is discongested, then that the solution D handsheet after discongesting is dry, obtain print; Or the solution D after discongesting is carried out suction filtration, by filtration cakes torrefaction, obtains print;
Step 5: take out after print being impregnated in solution A and dry, then hot-forming, namely obtain rare earth modified paper friction material.
Time of repose in described step one is 20h ~ 30h.
In described step 2, the diameter of multi-walled carbon nano-tubes is 30 ~ 50nm.
In described step 2, the mass concentration of sodium dodecyl sulfate aqueous solution is 0.1% ~ 0.5%.
The nitrate solution of the rare earth element in described step 2 is dissolved in the water at cerous nitrate, lanthanum nitrate or yttrium nitrate, obtains after stirring.
In described step 3, the diameter of chopped carbon fiber is 8 ~ 15 μm.
In described step 3, the beating degree of bamboo fibre is 75 ~ 90.SR。
That discongests in described step 4 disperses 800 ~ 2000r for solution D being poured in fluffer.
Temperature hot-forming in described step 5 is 150 ~ 180 DEG C, and the time is 10 ~ 20min, and pressure is 3 ~ 8MPa.
Vulcanizer is used to carry out hot-forming operation in described step 5.
Relative to prior art, beneficial effect is the invention enables to be:
The invention provides a kind of preparation method effectively improving the rare earth modified paper friction material of the frictional behaviour of Wet-type friction material by adding rare earth element.The nitrate solution adding rare earth element in the suspension B be in control by multi-wall carbon nano-tube obtains suspension C, then chopped carbon fiber, bamboo fibre and diatomite are uniformly dispersed in water, add suspension C again, the technique of papermaking is adopted to be prepared into print, or adopt suction filtration operation to be prepared into print, print is flooded the solution A obtained by cashew nut oil modified alkyd resin, rear hot-press solidifying to be dried, is finally prepared into rare earth modified paper friction material again.And by controlling the content of various component, the rare earth modified paper friction material of different coefficients of friction and wear rate can be obtained.Present invention process is simple and easy to control, is mixed by rare earth element as raw material and CNT, makes it fully combine, integrally plays a role, and prepares the rare earth modified paper friction material of individual layer.One aspect of the present invention can overcome friction material surface out-of-flatness prepared by prior art, the problem that each component interface cohesion is insecure and frictional behaviour is unstable, rare earth element is applied in paper friction material, and CNT acting in conjunction can improve the interface bond strength between the flatness of paper friction material and each component greatly; And when adopting suction filtration operation to prepare print, whole tableting process zero water can be realized and participate in, overcoming the deficiency can only preparing paper friction material in prior art in aqueous phase, free settling is not poly-with wadding to make the solution D when preparing paper friction material; Greatly can improve the frictional behaviour of paper friction material on the other hand, effective reduction wear rate, interface cohesion between each component of rare earth modified paper friction material prepared is very firm, and its surfacing is smooth, wear rate is low, coefficient of friction is high, friction noise is little, stable friction performance, material heat conductivity are good.Can bring up to 0.14 by 0.12 by the coefficient of kinetic friction measured by QM1000-II type tester for friction between, wear rate can by 5.0 × 10
-8drop to 1.4 × 10
-8, there are good large-scale industrial production potentiality.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscopic picture on the rare earth modified paper friction material surface that embodiment 3 is prepared.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.
The cashew nut oil modified alkyd resin used in the present invention is from Shandong Shengquan Chemical Industry Co., Ltd., and model is PF-6291A; Multi-walled carbon nano-tubes is from Tsing-Hua University's chemical industry system reaction engineering laboratory; Chopped carbon fiber is from Anshan Sinocrab Carbon Fiber Co., Ltd..
Embodiment 1:
Step one: get 0.7g cashew nut oil modified alkyd resin, is dissolved in 60mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 20h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 100mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.1% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 0.5g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 4 hours, obtain suspension B, be that cerous nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 1% again by the mass concentration of 50mL, obtain after stirring, the mass concentration of cerous nitrate is 1%) join in the suspension B of 100mL, obtain suspension C;
Step 3: to add 6g diameter in the water of every 50mL be chopped carbon fiber, the 5g beating degree of 8 ~ 15 μm is 75.The bamboo fibre of SR and 1g diatomite, be uniformly dispersed, obtain mixed solution, then get 80g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D poured in fluffer and disperse 800r, takes out the solution D after discongesting, and handsheet on handsheet machine is also dry, obtains print;
Step 5: print be impregnated in solution A and take out nature after 10min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 150 DEG C, and hot pressing time is 10min, hot pressing pressure is 3MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Embodiment 2:
Step one: get 1.2g cashew nut oil modified alkyd resin, is dissolved in 70mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 24h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 170mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.2% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 1g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5 hours, obtain suspension B, be that lanthanum nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 2% again by the mass concentration of 60mL, obtain after stirring, the mass concentration of lanthanum nitrate is 1%) join in the suspension B of 170mL, obtain suspension C;
Step 3: to add 8g diameter in the water of every 60mL be chopped carbon fiber, the 7g beating degree of 8 ~ 15 μm is 78.The bamboo fibre of SR and 1.5g diatomite, be uniformly dispersed, obtain mixed solution, then get 100g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D poured in fluffer and disperse 1000r, takes out the solution D after discongesting, and handsheet on handsheet machine is also dry, obtains print;
Step 5: print be impregnated in solution A and take out nature after 15min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 155 DEG C, and hot pressing time is 12min, hot pressing pressure is 4MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Embodiment 3:
Step one: get 2.25g cashew nut oil modified alkyd resin, is dissolved in 80mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 26h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 250mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.3% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 2.5g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5.5 hours, obtain suspension B, be that cerous nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 3% again by the mass concentration of 70mL, obtain after stirring, the mass concentration of cerous nitrate is 1%) join in the suspension B of 250mL, obtain suspension C;
Step 3: to add 10g diameter in the water of every 70mL be chopped carbon fiber, the 9g beating degree of 8 ~ 15 μm is 80.The bamboo fibre of SR and 2.5g diatomite, be uniformly dispersed, obtain mixed solution, then get 200g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D poured in fluffer and disperse 1500r, takes out the solution D after discongesting, and handsheet on handsheet machine is also dry, obtains print;
Step 5: print be impregnated in solution A and take out nature after 20min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 160 DEG C, and hot pressing time is 15min, hot pressing pressure is 5MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Fig. 1 is the scanning electron microscopic picture on the rare earth modified paper friction material surface that the present embodiment is prepared.As can see from Figure 1, prepared rare earth modified paper friction material interface cohesion is tight, and surface is quite smooth, and multi-walled carbon nano-tubes and bamboo fibre are closely wrapped in chopped carbon fiber surface.
Embodiment 4:
Step one: get 3g cashew nut oil modified alkyd resin, is dissolved in 90mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 30h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 500mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.5% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 4.8g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 6 hours, obtain suspension B, be that lanthanum nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 3.5% again by the mass concentration of 80mL, obtain after stirring, the mass concentration of lanthanum nitrate is 1%) join in the suspension B of 500mL, obtain suspension C;
Step 3: to add 13g diameter in the water of every 80mL be chopped carbon fiber, the 11g beating degree of 8 ~ 15 μm is 85.The bamboo fibre of SR and 3g diatomite, be uniformly dispersed, obtain mixed solution, then get 300g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D poured in fluffer and disperse 2000r, takes out the solution D after discongesting, and handsheet on handsheet machine is also dry, obtains print;
Step 5: print be impregnated in solution A and take out nature after 25min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 170 DEG C, and hot pressing time is 18min, hot pressing pressure is 6MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Embodiment 5:
Step one: get 2g cashew nut oil modified alkyd resin, is dissolved in 120mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 22h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 300ml mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.4% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 8g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5 hours, obtain suspension B, be that yttrium nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 4% again by the mass concentration of 90mL, obtain after stirring, the mass concentration of yttrium nitrate is 1%) join in the suspension B of 300mL, obtain suspension C;
Step 3: to add 14g diameter in the water of every 90mL be chopped carbon fiber, the 12g beating degree of 8 ~ 15 μm is 90.The bamboo fibre of SR and 5g diatomite, be uniformly dispersed, obtain mixed solution, then get 400g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D poured in fluffer and disperse 1200r, takes out the solution D after discongesting, and handsheet on handsheet machine is also dry, obtains print;
Step 5: print be impregnated in solution A and take out nature after 30min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 180 DEG C, and hot pressing time is 20min, hot pressing pressure is 8MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Embodiment 6:
Step one: get 2.7g cashew nut oil modified alkyd resin, is dissolved in 50mL absolute ethyl alcohol and obtains phenol resin solution, after phenolic resins fully dissolves, leave standstill 28h, and sealing is preserved, and obtains solution A;
Step 2: be that to be dispersed in 400ml mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.25% for the multi-walled carbon nano-tubes of 30 ~ 50nm by 6g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5 hours, obtain suspension B, be that yttrium nitrate (is dissolved in the water by the nitrate solution of the rare earth element of 2.5% again by the mass concentration of 100mL, obtain after stirring, the mass concentration of yttrium nitrate is 1%) join in the suspension B of 400mL, obtain suspension C;
Step 3: to add 11.5g diameter in the water of every 100mL be chopped carbon fiber, the 8g beating degree of 8 ~ 15 μm is 82.The bamboo fibre of SR and 4g diatomite, be uniformly dispersed, obtain mixed solution, then get 250g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D is poured in fluffer and disperses 1800r, take out the solution D after discongesting, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching discongested is poured in funnel and carry out suction filtration, after suction filtration terminates, filter cake is carried out drying, obtain print;
Step 5: print be impregnated in solution A and take out nature after 30min and dry, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 175 DEG C, and hot pressing time is 13min, hot pressing pressure is 7MPa, namely obtains the rare earth modified paper friction material of stable friction performance.
Interface cohesion between each component of rare earth modified paper friction material that the present invention prepares is very firm, its surfacing is smooth, wear rate is low, coefficient of friction is high, friction noise is little, stable friction performance, material heat conductivity are good, can bring up to 0.14 by 0.12 by the coefficient of kinetic friction measured by QM1000-II type tester for friction between, wear rate can by 5.0 × 10
-8drop to 1.4 × 10
-8.
Claims (8)
1. a preparation method for rare earth modified paper friction material, is characterized in that: comprise the following steps:
Step one: be dissolved in by the cashew nut oil modified alkyd resin of every 0.7g ~ 3.0g in the absolute ethyl alcohol of every 50 ~ 100mL, obtain phenol resin solution, leaves standstill, and sealing is preserved, and obtains solution A;
Step 2: be dispersed in by the multi-walled carbon nano-tubes of every 0.5 ~ 8g in the sodium dodecyl sulfate aqueous solution of every 100 ~ 500mL, is stirred to multi-walled carbon nano-tubes and is uniformly dispersed, and obtains suspension B; The mass concentration adding 50 ~ 100mL again in the suspension B of every 100 ~ 500mL is the nitrate solution of the rare earth element of 1% ~ 4%, obtains suspension C; The nitrate solution of described rare earth element is dissolved in the water at cerous nitrate, lanthanum nitrate or yttrium nitrate, obtains after stirring;
Step 3: the diatomite adding the chopped carbon fiber of 6 ~ 14g, the bamboo fibre of 5 ~ 12g and 1 ~ 5g in the water of every 50 ~ 100mL, be uniformly dispersed, obtain mixed solution, again suspension C is joined in mixed solution and obtain solution D, when wherein often adding 6 ~ 14g chopped carbon fiber, add 80 ~ 400g suspension C;
Step 4: solution D is discongested, then that the solution D handsheet after discongesting is dry, obtain print; Or the solution D after discongesting is carried out suction filtration, by filtration cakes torrefaction, obtains print;
Step 5: take out after print being impregnated in solution A and dry, then hot-forming, namely obtain rare earth modified paper friction material, wherein hot-forming temperature is 150 ~ 180 DEG C, and the time is 10 ~ 20min, and pressure is 3 ~ 8MPa.
2. the preparation method of rare earth modified paper friction material according to claim 1, is characterized in that: the time of repose in described step one is 20h ~ 30h.
3. the preparation method of rare earth modified paper friction material according to claim 1, is characterized in that: in described step 2, the diameter of multi-walled carbon nano-tubes is 30 ~ 50nm.
4. the preparation method of the rare earth modified paper friction material according to claim 1 or 3, is characterized in that: in described step 2, the mass concentration of sodium dodecyl sulfate aqueous solution is 0.1% ~ 0.5%.
5. the preparation method of rare earth modified paper friction material according to claim 1, is characterized in that: in described step 3, the diameter of chopped carbon fiber is 8 ~ 15 μm.
6. the preparation method of rare earth modified paper friction material according to claim 1 or 5, is characterized in that: in described step 3, the beating degree of bamboo fibre is 75 ~ 90
.SR。
7. the preparation method of rare earth modified paper friction material according to claim 1, is characterized in that: that discongests in described step 4 disperses 800 ~ 2000r for solution D being poured in fluffer.
8. the preparation method of rare earth modified paper friction material according to claim 1, is characterized in that: use vulcanizer to carry out hot-forming operation in described step 5.
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| CN1432429A (en) * | 2003-02-28 | 2003-07-30 | 清华大学 | Cerium-based carbon-containing nanotube composite RE oxide and its prepn |
| CN1844228A (en) * | 2006-05-11 | 2006-10-11 | 上海交通大学 | Process for preparing rare earth modified carbon nanotube/polytetrafluoroethylene composite materials |
| CN102943410A (en) * | 2012-11-14 | 2013-02-27 | 陕西科技大学 | Method for preparing MWNT (Multi-Walled Carbon Nanotube) modified paper-based friction material |
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| US5989390A (en) * | 1999-01-06 | 1999-11-23 | Knowlton Specialty Papers, Inc. | Friction paper containing activated carbon |
| CN1432429A (en) * | 2003-02-28 | 2003-07-30 | 清华大学 | Cerium-based carbon-containing nanotube composite RE oxide and its prepn |
| CN1844228A (en) * | 2006-05-11 | 2006-10-11 | 上海交通大学 | Process for preparing rare earth modified carbon nanotube/polytetrafluoroethylene composite materials |
| CN102943410A (en) * | 2012-11-14 | 2013-02-27 | 陕西科技大学 | Method for preparing MWNT (Multi-Walled Carbon Nanotube) modified paper-based friction material |
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