CN103726399B - A kind of blended fiber strengthens paper friction material and preparation method thereof - Google Patents
A kind of blended fiber strengthens paper friction material and preparation method thereof Download PDFInfo
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Abstract
A kind of blended fiber strengthens paper friction material and preparation method thereof, is dissolved in by 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; Cerous nitrate solution is joined in suspension B and obtain suspension C; Chopped carbon fiber, glass fibre, bamboo fibre and boron carbide 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 blended fiber and strengthen paper friction material, its coefficient of kinetic friction remains on 0.147 ~ 0.162.The present invention selects carbon fiber, glass fibre and bamboo fibre as fortifying fibre, and prepare blended fiber and strengthen paper friction material, technique is simple and easy to control, substantially increases coefficient of friction and the frictional behaviour of paper friction material, effectively reduces wear rate.
Description
Technical field
The invention belongs to friction material field, be specifically related to a kind of blended fiber and strengthen paper friction material and preparation method thereof.
Background technology
Paper friction material is a kind of key function material be applied in wet clutch and brake, and its performance quality directly affects the stability of transmission device torsion pass and the security of driving.Paper friction material is a kind of multicomponent composite materials, is usually made up of ten plurality of raw materials. functionally raw material can be divided into reinforcement, binding agent, frictional property regulator and filler four kinds.[Zhang Xiang, Li Kezhi, Li Hejun, Fu Yewei, Fei Jie, Li Hailiang. graphite particle size is on the impact of paper friction material friction and wear behavior. Journal of Inorganic Materials, 2011,26 (6): 638-642.].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 being widely used in all kinds of heavy vehicle and engineering machinery and brake, particularly as the friction plate material of wet clutch in automatic gearbox.
Fortifying fibre has important impact to the intensity of friction material, heat resistance, the performance such as porosity and friction and wear behavior.Thus the selection of fortifying fibre is the important step characterizing Friction Materials level.In recent years, domesticly in the Selecting research of fortifying fibre, achieve larger progress, but fiber select more single, test data accumulation is less.Knowledge of regularity assorted fibre being affected to fretting wear is more shallow, still can not give full play to the advantage of fibre property complementation.
Summary of the invention
The object of the present invention is to provide a kind of blended fiber to strengthen paper friction material and preparation method thereof, the method technique is simple and easy to control, can be improved the frictional behaviour of paper friction material by the mutual supplement with each other's advantages of three kinds of fibers.
For achieving the above object, the technical solution used in the present invention is:
Blended fiber strengthens a preparation method for paper friction material, comprises the following steps:
Step one: be dissolved in by the cashew nut oil modified alkyd resin of every 0.7g ~ 3.2g in the absolute ethyl alcohol of every 50 ~ 120mL, 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 ~ 7.8g in the sodium dodecyl sulfate aqueous solution of every 150 ~ 450mL, 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 150 ~ 450mL is the cerous nitrate solution of 1% ~ 4%, obtains suspension C;
Step 3: the boron carbide adding the chopped carbon fiber of 0.5 ~ 8g, the bamboo fibre of 0.5 ~ 8g, the glass fibre of 0.5 ~ 8g and 1 ~ 5g in the water of every 60 ~ 120mL, be uniformly dispersed, obtain mixed solution, again suspension C is joined in mixed solution and obtain solution D, when wherein often adding 1 ~ 5g boron carbide, add 100 ~ 420g suspension C;
Step 4: solution D discongested, then by dry after the solution D handsheet after discongesting, obtains print;
Step 5: take out after print being impregnated in solution A and dry, then hot-forming, namely obtain blended fiber and strengthen paper friction material.
Time of repose in described step one is 15h ~ 35h.
In described step 2, the diameter of multi-walled carbon nano-tubes is 20 ~ 60nm, and the required time that stirs is 4 ~ 6 hours.
In described step 2, the mass concentration of sodium dodecyl sulfate aqueous solution is 0.2% ~ 0.6%.
In described step 3, the diameter of chopped carbon fiber is 6 ~ 18 μm; The diameter of glass fibre is 6 ~ 20 μm; The beating degree of bamboo fibre is 70 ~ 85 ° of SR.
Discongesting in described step 4 disperses 1000 ~ 2500r for solution D being poured in fluffer.
Concrete operations dry after handsheet in described step 4 are: first carry out twice handsheet respectively, the sheet then copied twice under wet type state superposes, then carries out drying.
Dip time in described step 5 is 10 ~ 30min.
Temperature hot-forming in described step 5 is 150 ~ 200 DEG C, and the time is 10 ~ 15min, and pressure is 3 ~ 10MPa.
The blended fiber that the preparation method that described blended fiber strengthens paper friction material obtains strengthens paper friction material, is 0.1kgm at main shaft inertia
2, apparent specific pressure is 0.25 ~ 1.5MPa, rotating speed is under 2000r/min condition, and its coefficient of kinetic friction is 0.147 ~ 0.162.
Relative to prior art, the present invention has following beneficial effect:
Blended fiber provided by the invention strengthens the preparation method of paper friction material, effectively can be improved the frictional behaviour of paper friction material by the mutual supplement with each other's advantages of three kinds of fibers.First in the suspension B be in control by multi-wall carbon nano-tube, add cerous nitrate solution obtains suspension C, then chopped carbon fiber, bamboo fibre, glass fibre and boron carbide are uniformly dispersed in water, add suspension C again, the technique of papermaking is adopted to be prepared into print, again print is flooded the solution A obtained by cashew nut oil modified alkyd resin, hot-press solidifying after drying, final obtained blended fiber strengthens paper friction material.And by controlling the content of various component, the blended fiber that can obtain different coefficients of friction and wear rate strengthens paper friction material.The present invention selects carbon fiber, glass fibre and bamboo fibre as fortifying fibre, prepare blended fiber and strengthen paper friction material, the problem that the friction material coefficient of kinetic friction is lower, compression resilience is poor and frictional behaviour is unstable prepared by prior art can be overcome.Glass fibre and carbon fiber, due to its higher ratio of strength to weight and good heat resistance, are therefore widely used in paper friction material, but due to combination between the two very weak, therefore rarely have the report both be simultaneously used in paper friction material.Bamboo fibre due to its heat resistance poor, be therefore also seldom used to paper friction material.But when three is used in paper friction material simultaneously; together with glass fibre has been connected in carbon fiber by bamboo fibre powerful winding ability tightly; and in paper friction material, add CNT in the present invention; CNT can cover bamboo fibre surface, protects bamboo fibre well.Therefore carbon fiber, glass fibre and bamboo fibre are applied in paper friction material simultaneously, greatly can improve the frictional behaviour of paper friction material, effectively reduce wear rate, improve compression resilience and heat resistance.In addition, glass fibre is relative to carbon fiber, and price is very cheap, therefore replaces carbon fiber greatly can also reduce the manufacturing cost of paper friction material while greatly improving paper friction material performance with fiberglass parts.And utilize cashew nut oil modified alkyd resin three kinds of fibers well can be combined acting in conjunction with other components as bonding agent, farthest improve the frictional behaviour of paper friction material, effectively reduce wear rate.Present invention process controls simple, has good large-scale industrial production potentiality.
Blended fiber prepared by the present invention strengthens the advantages such as paper friction material has that coefficient of friction is high, wear rate is low, stable friction performance, ABRASION RESISTANCE are good, resistance to heat shocks is good and the heat conductivity of material is good.Be 0.1kgm by QM1000-II type wet type inertia frictional property test machine at main shaft inertia
2, apparent specific pressure is 0.25 ~ 1.5MPa, rotating speed is under 2000r/min condition, the coefficient of kinetic friction recording the blended fiber enhancing paper friction material of preparation remains on 0.147 ~ 0.162, and be stabilized in about 0.150, stability is better, and its coefficient of kinetic friction is far longer than the coefficient of kinetic friction of the paper friction material prepared when not adding glass fibre, has a good application prospect.
Further, have employed lamination process in the present invention when handsheet, namely carry out twice handsheet respectively, then superpose under wet type state, the blended fiber preparing lamination strengthens paper friction material, and the performance of the paper friction material obtained can be made more stable.This is because when using handsheet machine to carry out super sheet, due to the factor such as gravity, draft, the sheet obtained can be made to there is positive and negative, thus affect the performance of obtained paper friction material.But after adopting the technique of handsheet and then lamination at twice, greatly can reduce the impact of this positive and negative, thus make the performance of the paper friction material obtained more stable.
Accompanying drawing explanation
Fig. 1 is the apparent specific pressure-coefficient of kinetic friction curve map of the blended fiber enhancing paper friction material that the present invention prepares, wherein 1# is the apparent specific pressure-coefficient of kinetic friction curve of the blended fiber enhancing paper friction material that embodiment 3 is prepared, and 2# is the apparent specific pressure-coefficient of kinetic friction curve of the paper friction material prepared remove glass fibre in the formula of embodiment 3 after.
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.; Glass fibre is from Kaifeng Zhong Cai building material Co., Ltd.
Embodiment 1:
Step one: get 0.7g cashew nut oil modified alkyd resin, is dissolved in 60mL absolute ethyl alcohol, 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 150mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.2% for the multi-walled carbon nano-tubes of 20 ~ 60nm by 0.5g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 4 hours, obtain suspension B, by the mass concentration of 50mL be again 1% cerous nitrate solution join in the suspension B of 150mL, obtain suspension C;
Step 3: glass fibre and 1g boron carbide that the bamboo fibre that to add 6g diameter in the water of every 60mL be chopped carbon fiber, the 3g beating degree of 6 ~ 18 μm is 75 ° of SR, 0.5g diameter are 6 ~ 20 μm, be uniformly dispersed, mixed solution, then get 100g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D is poured in fluffer and disperses 1000r, take out the solution D after discongesting, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, obtains print;
Step 5: be impregnated in by print in solution A, takes out nature and dries after 10min, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 150 DEG C, hot pressing time is 10min, and hot pressing pressure is 3MPa, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
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 15h, 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 0.3% for the multi-walled carbon nano-tubes of 20 ~ 60nm by 1g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5 hours, obtain suspension B, by the mass concentration of 60mL be again 2% cerous nitrate solution join in the suspension B of 170mL, obtain suspension C;
Step 3: glass fibre and 1.5g boron carbide that the bamboo fibre that to add 5g diameter in the water of every 70mL be chopped carbon fiber, the 2g beating degree of 6 ~ 18 μm is 78 ° of SR, 2g diameter are 6 ~ 20 μm, be uniformly dispersed, mixed solution, then get 420g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D is poured in fluffer and disperses 1200r, take out the solution D after discongesting, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, 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, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
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 0.4% for the multi-walled carbon nano-tubes of 20 ~ 60nm by 2.5g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5.5 hours, obtain suspension B, by the mass concentration of 70mL be again 3% cerous nitrate solution join in the suspension B of 250mL, obtain suspension C;
Step 3: glass fibre and 2.5g boron carbide that the bamboo fibre that to add 4g diameter in the water of every 80mL be chopped carbon fiber, the 4g beating degree of 6 ~ 18 μm is 80 ° of SR, 3g diameter are 6 ~ 20 μm, be uniformly dispersed, mixed solution, then get 200g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D is poured in fluffer and disperses 1500r, take out the solution D after discongesting, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, 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, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
Adopting QM1000-II type Wet-type friction material performance aircraft, is 0.1kgm at main shaft inertia
2brake pressure (apparent specific pressure) is respectively 0.25,0.5,0.75,1.0,1.25,1.5MPa, rotating speed be the coefficient of kinetic friction that records under 2000r/min condition as shown in Figure 1, wherein 1# is the apparent specific pressure-coefficient of kinetic friction curve of the blended fiber enhancing paper friction material that embodiment 3 is prepared, and 2# is the apparent specific pressure-coefficient of kinetic friction curve of the paper friction material prepared remove glass fibre in the formula of embodiment 3 after.The stability that blended fiber can be made to strengthen paper friction material that adds of glass fibre improves greatly.As can be seen from Figure 1, the coefficient of kinetic friction that prepared blended fiber strengthens paper friction material is 0.147 ~ 0.162, and is stabilized in about 0.15, good stability, is far longer than the coefficient of kinetic friction of the paper friction material not adding glass fibre.
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 450mL mass concentration be in dodecyl sodium sulfate (SDS) aqueous solution of 0.5% for the multi-walled carbon nano-tubes of 20 ~ 60nm by 4.8g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 6 hours, obtain suspension B, by the mass concentration of 80mL be again 3.5% cerous nitrate solution join in the suspension B of 450mL, obtain suspension C;
Step 3: glass fibre and 3g boron carbide that the bamboo fibre that to add 3g diameter in the water of every 90mL be chopped carbon fiber, the 5g beating degree of 6 ~ 18 μm is 85 ° of SR, 6g diameter are 6 ~ 20 μm, be uniformly dispersed, mixed solution, then get 300g suspension C and to pour in mixed solution to obtain solution D into;
Step 4: solution D is poured in fluffer and disperses 2000r, take out the solution D after discongesting, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, 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 13min, hot pressing pressure is 6MPa, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
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 0.6% for the multi-walled carbon nano-tubes of 20 ~ 60nm by 7.8g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 5 hours, obtain suspension B, by the mass concentration of 90mL be again 4% cerous nitrate solution join in the suspension B of 300mL, obtain suspension C;
Step 3: glass fibre and 5g boron carbide that the bamboo fibre that to add 2g diameter in the water of every 100mL be chopped carbon fiber, the 0.5g beating degree of 6 ~ 18 μm is 72 ° of SR, 7g diameter are 6 ~ 20 μm, be uniformly dispersed, mixed solution, then get 400g 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, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, 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 14min, hot pressing pressure is 8MPa, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
Embodiment 6:
Step one: get 3.2g 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 35h, 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 20 ~ 60nm by 6g diameter, magnetic agitation is uniformly dispersed to multi-walled carbon nano-tubes for 4.5 hours, obtain suspension B, by the mass concentration of 100mL be again 2.5% cerous nitrate solution join in the suspension B of 400mL, obtain suspension C;
Step 3: glass fibre and 4g boron carbide that the bamboo fibre that to add 0.5g diameter in the water of every 120mL be chopped carbon fiber, the 8g beating degree of 6 ~ 18 μm is 70 ° of SR, 8g diameter are 6 ~ 20 μm, be uniformly dispersed, 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 2500r, take out the solution D after discongesting, handsheet machine first carries out twice handsheet respectively, and the sheet then copied twice under wet type state superposes, then carries out drying, 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 200 DEG C, and hot pressing time is 11min, hot pressing pressure is 10MPa, and the blended fiber namely obtaining stable friction performance strengthens paper friction material.
Claims (7)
1. blended fiber strengthens a preparation method for paper friction material, it 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 ~ 3.2g in the absolute ethyl alcohol of every 50 ~ 120mL, obtain phenol resin solution, leaves standstill 15h ~ 35h, and sealing is preserved, and obtains solution A;
Step 2: it is in the sodium dodecyl sulfate aqueous solution of 0.2% ~ 0.6% that the multi-walled carbon nano-tubes being 20 ~ 60nm by every 0.5 ~ 7.8g diameter is dispersed in every 150 ~ 450mL mass concentration, stir and be uniformly dispersed to multi-walled carbon nano-tubes for 4 ~ 6 hours, obtain suspension B; The mass concentration adding 50 ~ 100mL again in the suspension B of every 150 ~ 450mL is the cerous nitrate solution of 1% ~ 4%, obtains suspension C;
Step 3: the boron carbide adding the chopped carbon fiber of 0.5 ~ 8g, the bamboo fibre of 0.5 ~ 8g, the glass fibre of 0.5 ~ 8g and 1 ~ 5g in the water of every 60 ~ 120mL, be uniformly dispersed, obtain mixed solution, again suspension C is joined in mixed solution and obtain solution D, when wherein often adding 1 ~ 5g boron carbide, add 100 ~ 420g suspension C;
Step 4: solution D discongested, then by dry after the solution D handsheet after discongesting, obtains print;
Step 5: take out after print being impregnated in solution A and dry, then hot-forming, namely obtain blended fiber and strengthen paper friction material.
2. blended fiber according to claim 1 strengthens the preparation method of paper friction material, it is characterized in that: in described step 3, the diameter of chopped carbon fiber is 6 ~ 18 μm; The diameter of glass fibre is 6 ~ 20 μm; The beating degree of bamboo fibre is 70 ~ 85 ° of SR.
3. blended fiber according to claim 1 strengthens the preparation method of paper friction material, it is characterized in that: discongesting in described step 4 disperses 1000 ~ 2500r for solution D being poured in fluffer.
4. the blended fiber according to claim 1 or 3 strengthens the preparation method of paper friction material, it is characterized in that: concrete operations dry after the handsheet in described step 4 are: first carry out twice handsheet respectively, then the sheet copied twice under wet type state superposes, then carries out drying.
5. blended fiber according to claim 1 strengthens the preparation method of paper friction material, it is characterized in that: the dip time in described step 5 is 10 ~ 30min.
6. blended fiber strengthens the preparation method of paper friction material according to claim 1 or 5, and it is characterized in that: temperature hot-forming in described step 5 is 150 ~ 200 DEG C, the time is 10 ~ 15min, and pressure is 3 ~ 10MPa.
7. strengthen according to the blended fiber in claim 1-6 described in any one the blended fiber that the preparation method of paper friction material obtains and strengthen paper friction material, it is characterized in that: be 0.1kgm at main shaft inertia
2, apparent specific pressure is 0.25 ~ 1.5MPa, rotating speed is under 2000r/min condition, and its coefficient of kinetic friction is 0.147 ~ 0.162.
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| CN102093842A (en) * | 2010-11-18 | 2011-06-15 | 西北工业大学 | Carbonaceous double-layer paper-based friction material and preparation method thereof |
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