CN103541266A - Pumping filtration-based preparation method of paper-based friction material - Google Patents
Pumping filtration-based preparation method of paper-based friction material Download PDFInfo
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Abstract
The invention discloses a pumping filtration-based preparation method of a paper-based friction material. The pumping filtration-based preparation method comprises the following steps of dissolving cashew nut shell oil-modified phenolic resin in anhydrous ethanol to obtain a solution A, dispersing multi-walled carbon nanotubes in a sodium dodecyl sulfate aqueous solution to obtain a suspension liquid B, dispersing short carbon fibers, bamboo fibers, diatomite and the solution A in anhydrous ethanol, adding the suspension liquid B into the mixed solution to obtain a solution C, carrying out defibering on the solution C, carrying out suction filtration and drying to obtain a sample sheet, soaking the sample sheet in the solution A, taking out the sample sheet, carrying out drying in air, carrying out hot press molding to obtain the paper-based friction material obtained based on pumping filtration. The pumping filtration-based preparation method utilizes a pumping filtration process to replace a sheet making machine for friction material sheet formation, can prepare the single-layer paper-based friction material, has easily controlled processes, solves the problem that the existing paper-based friction material preparation technology can be carried out only in a water phase, is free of water use in the whole sheet formation process, greatly improves the friction performances of the paper-based friction material, and effectively reduces a wear rate.
Description
Technical field
The invention belongs to friction material field, relate to the preparation method of paper friction material in a kind of oil phase, particularly a kind of preparation method of the paper friction material based on suction filtration.
Background technology
Wet-type friction material refers to work in the friction material in lubricant medium (being mainly lubricating oil), be mainly used in [P.Marklund in the wet type transmission 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, single certain material is difficult to meet all operating mode instructions for uses, thereby 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.
Along with motor vehicles are to high speed, heavy duty, pollution-free future development, for torsion pass and the braking characteristic of held stationary, the frictional behaviour of friction material, heat resistance and chemical stability etc. are had higher requirement.Researchers have made some effort and effect [Kim S J, Cho M H, Lim D S, et al.Wear, 2001, (251): 1484～1491] at paper base material the Nomenclature Composition and Structure of Complexes design aspect.The fast development that is not material with carbon element in recent years makes its application in friction material field also obtain expansion, Tsing-Hua University is permitted vertical Ning Dengren and has been done than more comprehensively studying [Xu Lining aspect the impact of wet clutch carbonaceous friction material frictional behaviour at resin content, Deng Haijin, Wang Xinpeng, Li Ming. process materials equipment, 2001 (10): 33-35].Being permitted the vertical peaceful people of grade finds in the wet clutch carbonaceous friction material consisting of resinoid bond, graphite rubbing agent and other filler, the heat resistance of resin is the poorest, had a strong impact on the friction and wear behavior of friction material, thereby the content of resin just becomes the focus of research.Resin content is too high, and friction material heat fading is serious, and coefficient of friction sharply declines; Resin content is too low, and friction material is unstable because of the very few coefficient of friction that causes of stick amount, and fret wear aggravates.
Paper friction material mainly adopts the mode of papermaking to produce by fiber, binding agent, frictional property regulator, filler etc. in water.When paper friction material batch mixing prepared by this method is made suspension, free settling, wadding is poly-, and the combination of various components belongs to physical bond, and interface is in conjunction with being not very even, and ABRASION RESISTANCE is also bad.And a large amount of resins can not enter in friction plate, give full play to the effect of its bonding agent.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of the paper friction material based on suction filtration, the method technique is simple and easy to control, utilize suction filtration operation to replace the process in blocks that traditional handsheet machine is realized friction material, can realize whole process in blocks zero water and participate in, improve the frictional behaviour of paper friction material.
For achieving the above object, the technical solution used in the present invention comprises the following steps:
Step 1: the cashew nut oil modified alkyd resin of every 1.0g～5.0g is dissolved in the absolute ethyl alcohol of every 50～150mL, obtains phenol resin solution, standing, sealing is preserved, and obtains A solution;
Step 2: the multi-walled carbon nano-tubes of every 2～8g is dispersed in the sodium dodecyl sulfate aqueous solution of every 100～500mL, is stirred to multi-walled carbon nano-tubes and is uniformly dispersed, obtain suspension B;
Step 3: to the A solution that adds the chopped carbon fiber of 6～14g, the diatomite of the bamboo fibre of 5～12g, 1～5g and 20～80mL in the absolute ethyl alcohol of every 100～700mL, be uniformly dispersed, obtain mixed solution, again suspension B is joined in mixed solution and obtain C solution, while wherein often adding 20～80mL A solution, add 80～500g suspension B;
Step 4: C solution is discongested, then the C solution after discongesting is carried out to suction filtration, by filtration cakes torrefaction, obtain print;
Step 5: print be impregnated in after A solution and takes out and dry, then hot-forming, obtain the paper friction material based on suction filtration.
Time of repose in described step 1 is 20h～40h.
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%.
In described step 3, the diameter of chopped carbon fiber is 8～15 μ m.
In described step 3, the beating degree of bamboo fibre is 60～100 ° of SR.
In described step 4, discongest for C solution is poured into and is disperseed 800～2000r in fluffer.
In described step 5, hot-forming temperature is 140～180 ℃, and the time is 10～20min, and pressure is 3～8MPa.
In described step 5, use vulcanizer to carry out hot-forming operation.
With respect to prior art, the invention enables beneficial effect to be:
The invention provides a kind of by suction filtration, operate to realize in oil phase, prepare the preparation method of the paper friction material based on suction filtration that paper friction material effectively improves the frictional behaviour of Wet-type friction material.By chopped carbon fiber, bamboo fibre, diatomite and the A Solution Dispersion that obtained by cashew nut oil modified alkyd resin in absolute ethyl alcohol, add again the suspension B being in control by multi-wall carbon nano-tube, adopt suction filtration operation to be prepared into print, print is flooded to A solution, rear hot-press solidifying to be dried, is finally prepared into the paper friction material based on suction filtration.And by controlling the content of various components, can obtain the paper friction material based on suction filtration of different coefficients of friction and wear rate.Technique of the present invention is simple and easy to control, by suction filtration operational applications in Wet-type friction material preparation process, utilize suction filtration operation to replace the process in blocks that traditional handsheet machine is realized friction material, can realize whole process in blocks zero water and participate in, prepare the paper friction material of individual layer.One aspect of the present invention has overcome can only prepare the deficiency of paper friction material in prior art in water, in the time of simultaneously can overcoming traditional handsheet technique batch mixing and make suspension, free settling, wadding gather, the combination of various components belongs to physical bond, interface is in conjunction with inhomogeneous, ABRASION RESISTANCE is bad, and a large amount of resins can not enter into and in friction plate, give full play to the problems such as its bonding agent effect.Can greatly improve the frictional behaviour of paper friction material on the other hand, effectively reduce wear rate, while adopting method of the present invention to prepare paper friction material, C solution not free settling is poly-with wadding, a large amount of resins can enter into and in paper friction material, give full play to its bonding agent effect, therefore in the paper friction material of preparing, the combination of various components is not simple physical bond, its interface is combined, friction noise is little, wear rate is low, stable friction performance, ABRASION RESISTANCE is good, the Wet-type paper friction material based on suction filtration that coefficient of friction is high, by the coefficient of kinetic friction that QM1000-II type tester for friction between is measured, can bring up to 0.15 by 0.12, wear rate can be by 5.0 * 10
-8drop to 2.5 * 10
-8, there are good large-scale industrial production potentiality.
Accompanying drawing explanation
Fig. 1 is the surface scan Electronic Speculum picture of the paper friction material based on suction filtration prepared of embodiment 3.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.
The cashew nut oil modified alkyd resin using in the present invention is from Shandong Shengquan Chemical Industry Co., Ltd., and model is PF-6291A; Multi-walled carbon nano-tubes is reaction engineering laboratory from Tsing-Hua University's chemical industry; Chopped carbon fiber is from Anshan Sinocrab Carbon Fiber Co., Ltd..
Embodiment 1:
Step 1: get 1.0g cashew nut oil modified alkyd resin, be dissolved in 60mL absolute ethyl alcohol, obtain phenol resin solution, standing 20h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.1% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 3g diameter is dispersed in 100mL mass concentration, magnetic agitation 4 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 1g diatomite and 40mL that 7g beating degree is 60 ° of SR to adding 8g diameter in 100mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 100g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 1000r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 10min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 140 ℃, and hot pressing time is 10min, hot pressing pressure is 4MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Embodiment 2:
Step 1: get 2g cashew nut oil modified alkyd resin, be dissolved in 70mL absolute ethyl alcohol and obtain phenol resin solution, standing 25h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.2% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 4g diameter is dispersed in 200mL mass concentration, magnetic agitation 5 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 2g diatomite and 50mL that 8g beating degree is 70 ° of SR to adding 9g diameter in 200mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 200g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 1200r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 15min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 150 ℃, and hot pressing time is 12min, hot pressing pressure is 5MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Embodiment 3:
Step 1: get 3g cashew nut oil modified alkyd resin, be dissolved in 80mL absolute ethyl alcohol and obtain phenol resin solution, standing 30h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.3% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 5g diameter is dispersed in 300mL mass concentration, magnetic agitation 5.5 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 3g diatomite and 60mL that 9g beating degree is 80 ° of SR to adding 10g diameter in 300mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 300g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 1400r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 20min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 160 ℃, and hot pressing time is 14min, hot pressing pressure is 6MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Fig. 1 is the surface scan Electronic Speculum picture of the paper friction material based on suction filtration prepared of the present embodiment.As can see from Figure 1, there are a large amount of cashew nut oil modified alkyd resins to be present in the prepared friction material based on suction filtration inner, fully each component sticked together firmly, make interface in conjunction with tight.
Embodiment 4:
Step 1: get 4g cashew nut oil modified alkyd resin, be dissolved in 90mL absolute ethyl alcohol and obtain phenol resin solution, standing 35h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.4% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 6g diameter is dispersed in 400mL mass concentration, magnetic agitation 6 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 4g diatomite and 70mL that 10g beating degree is 90 ° of SR to adding 11g diameter in 400mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 400g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 1600r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 25min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 170 ℃, and hot pressing time is 16min, hot pressing pressure is 7MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Embodiment 5:
Step 1: get 5g cashew nut oil modified alkyd resin, be dissolved in 100mL absolute ethyl alcohol and obtain phenol resin solution, standing 40h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.5% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 7g diameter is dispersed in 500mL mass concentration, magnetic agitation 5 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 5g diatomite and 80mL that 11g beating degree is 100 ° of SR to adding 12g diameter in 500mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 500g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 1800r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 30min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 180 ℃, and hot pressing time is 18min, hot pressing pressure is 8MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Embodiment 6:
Step 1: get 2.5g cashew nut oil modified alkyd resin, be dissolved in 150mL absolute ethyl alcohol and obtain phenol resin solution, standing 22h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.15% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 2g diameter is dispersed in 150mL mass concentration, magnetic agitation 6 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 2.5g diatomite and 20mL that 5g beating degree is 75 ° of SR to adding 14g diameter in 600mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 80g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 800r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 25min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 155 ℃, and hot pressing time is 20min, hot pressing pressure is 3MPa, obtains the paper friction material based on suction filtration of stable friction performance.
Embodiment 7:
Step 1: get 4.5g cashew nut oil modified alkyd resin, be dissolved in 50mL absolute ethyl alcohol and obtain phenol resin solution, standing 32h after phenolic resins fully dissolves, sealing is preserved, and obtains A solution;
Step 2: it is in 0.25% dodecyl sodium sulfate (SDS) aqueous solution that the multi-walled carbon nano-tubes that is 30～50nm by 8g diameter is dispersed in 350mL mass concentration, magnetic agitation 5 hours to multi-walled carbon nano-tubes is uniformly dispersed, and obtains suspension B;
Step 3: be the chopped carbon fiber of 8～15 μ m, the A solution of bamboo fibre, 3.5g diatomite and 45mL that 12g beating degree is 85 ° of SR to adding 6g diameter in 700mL absolute ethyl alcohol, be uniformly dispersed, mixed solution, then get 250g suspension B and pour in mixed solution to obtain C solution into;
Step 4: C solution is poured into and disperseed 2000r in fluffer, C solution after taking-up is discongested, funnel, bottle,suction, water circulating pump three are tightly connected, filter paper is adjacent to funnel bottom, open water pump, again the batching of discongesting is poured in funnel and carried out suction filtration, after suction filtration finishes, filter cake is dried, obtain print;
Step 5: print be impregnated in and takes out nature after 30min in A solution and dry, hot-forming on vulcanizer, the hot pressing temperature of controlling vulcanizer is 175 ℃, and hot pressing time is 15min, hot pressing pressure is 6.5MPa, obtains the paper friction material based on suction filtration of stable friction performance.
The Wet-type paper friction material interface based on suction filtration that the present invention prepares is combined, friction noise is little, wear rate is low, stable friction performance, coefficient of friction are high, by the measured coefficient of kinetic friction of QM1000-II type tester for friction between, can bring up to 0.15 by 0.12, wear rate can be by 5.0 * 10
-8drop to 2.5 * 10
-8.
Claims (9)
1. a preparation method for the paper friction material based on suction filtration, is characterized in that: comprise the following steps:
Step 1: the cashew nut oil modified alkyd resin of every 1.0g～5.0g is dissolved in the absolute ethyl alcohol of every 50～150mL, obtains phenol resin solution, standing, sealing is preserved, and obtains A solution;
Step 2: the multi-walled carbon nano-tubes of every 2～8g is dispersed in the sodium dodecyl sulfate aqueous solution of every 100～500mL, is stirred to multi-walled carbon nano-tubes and is uniformly dispersed, obtain suspension B;
Step 3: to the A solution that adds the chopped carbon fiber of 6～14g, the diatomite of the bamboo fibre of 5～12g, 1～5g and 20～80mL in the absolute ethyl alcohol of every 100～700mL, be uniformly dispersed, obtain mixed solution, again suspension B is joined in mixed solution and obtain C solution, while wherein often adding 20～80mL A solution, add 80～500g suspension B;
Step 4: C solution is discongested, then the C solution after discongesting is carried out to suction filtration, by filtration cakes torrefaction, obtain print;
Step 5: print be impregnated in after A solution and takes out and dry, then hot-forming, obtain the paper friction material based on suction filtration.
2. the preparation method of the paper friction material based on suction filtration according to claim 1, is characterized in that: the time of repose in described step 1 is 20h～40h.
3. the preparation method of the paper friction material based on suction filtration according to claim 1, is characterized in that: in described step 2, the diameter of multi-walled carbon nano-tubes is 30～50nm.
4. according to the preparation method of the paper friction material based on suction filtration described in claim 1 or 3, it 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 the paper friction material based on suction filtration according to claim 1, is characterized in that: in described step 3, the diameter of chopped carbon fiber is 8～15 μ m.
6. the preparation method of the paper friction material based on suction filtration according to claim 1 or 5, is characterized in that: in described step 3, the beating degree of bamboo fibre is 60～100 ° of SR.
7. the preparation method of the paper friction material based on suction filtration according to claim 1, is characterized in that: that in described step 4, discongests disperses 800～2000r for C solution is poured in fluffer.
8. the preparation method of the paper friction material based on suction filtration according to claim 1, is characterized in that: in described step 5, hot-forming temperature is 140～180 ℃, and the time is 10～20min, and pressure is 3～8MPa.
9. according to the preparation method of the paper friction material based on suction filtration described in claim 1 or 8, it is characterized in that: in described step 5, use vulcanizer to carry out hot-forming operation.
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| CN107310001A (en) * | 2017-06-28 | 2017-11-03 | 常州市瑞泰物资有限公司 | A kind of bamboo slab rubber and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297239A (en) * | 2015-09-17 | 2016-02-03 | 无锡市长安曙光手套厂 | Fragrance-releasing fabric and preparation method for same |
| CN105348729A (en) * | 2015-10-30 | 2016-02-24 | 陕西科技大学 | Preparation method of organic fiber reinforced carbon cloth/resin composite material |
| CN107310001A (en) * | 2017-06-28 | 2017-11-03 | 常州市瑞泰物资有限公司 | A kind of bamboo slab rubber and preparation method thereof |
| CN107310001B (en) * | 2017-06-28 | 2019-05-24 | 深圳市美术装饰工程有限公司 | A kind of bamboo slab rubber and preparation method thereof |
| CN110725153A (en) * | 2019-11-15 | 2020-01-24 | 杭州萧山红旗摩擦材料有限公司 | Paper-based friction material papermaking pulping preparation method |
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