CN103396764B - A kind of silicate cement strengthens paper friction material and preparation method thereof - Google Patents
A kind of silicate cement strengthens paper friction material and preparation method thereof Download PDFInfo
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Abstract
A kind of silicate cement strengthens paper friction material and preparation method thereof, comprise by mass fraction, the resol of 1.0 ~ 3.0 parts, the multi-walled carbon nano-tubes of 0.5 ~ 8.0 part, the sodium lauryl sulphate of 1.25 ~ 7.5 parts, the silicate cement of 2.5 ~ 5 parts, the bamboo fibers of the chopped carbon fiber of 12 ~ 24 parts and 6 ~ 12 parts.The present invention effectively improves the over-all properties of Wet-type paper friction material by adding finely dispersed cement suspension, the strong bonding characteristic had to make silicate cement gives full play of in paper friction material, by hot-press vulcanization technique, each component is effectively combined through cement more more tight, thus play toughness reinforcing effect; Make resol infiltrate the inside of paper friction material uniformly and effectively and solidify simultaneously, the friction and wear behavior of paper friction material is improved and makes motor vehicle more stable in the process of braking.
Description
Technical field
The invention belongs to paper friction material preparation field, be specifically related to a kind of silicate cement and strengthen paper friction material and preparation method thereof.
Background technology
Paper friction material is a kind of key function material be applied in humid clutch and stopper, and the quality of its performance directly affects the stability of transmission mechanism torsion pass and the security of driving.Paper friction material is a kind of multicomponent composite materials simultaneously, is usually made up of ten multiple materials.Functionally raw material can be divided into reinforcement, cohesive body, frictional property regulator and filler four kinds, the mode of usual employing papermaking is manufactured, and [appoints just, Deng Haijin so be called " paper substrate " friction materials, Li Ming. automotive engineering, 2004 (11): 1-4.].
Affect paper friction material performance factor numerous, wherein, the interfacial combined function in material between reinforcement and fiber is one of the important factor affecting material mechanical performance, frictionalwear performance.Wherein binding agent affects the interfacial combined function between reinforcement and fiber, thus the binding agent chosen for improving the mechanical property of paper friction material, frictionalwear performance is significant.Cement is powdery hydraulicity inorganic coagulation material.Add water after stirring and become slurry, can harden in atmosphere or better harden in water, and can the material such as sand, stone is cemented together securely.Resol has good mechanical property, high temperature resistant, moisture-proof, fire-retardant and cheap, is widely used in the industries such as anticorrosion engineering, moulding compound, glue paste, fire retardant material, grinding wheel manufacture.But the character such as its hardness is high, matter is crisp, working temperature thermolysis more than 250 DEG C is serious, have impact on its application in friction materials.In the process of paper friction material work, due to continuous print wearing and tearing, the temperature of material surface is raised; resin starts to decompose; the abrasive particle produced after decomposing can cause secondary to wear and tear in friction material surface, makes material surface produce cut, ditch dug with a plow, causes damage to friction material surface.
Summary of the invention
The object of the present invention is to provide a kind of silicate cement to strengthen paper friction material and preparation method thereof, improve the stability in the friction and wear behavior of paper-base friction wafer and braking procedure.
For achieving the above object, the present invention adopts following technical scheme:
A kind of silicate cement strengthens paper friction material, comprise by mass fraction, the resol of 1.0 ~ 3.0 parts, the multi-walled carbon nano-tubes of 0.5 ~ 8.0 part, the sodium lauryl sulphate of 1.25 ~ 7.5 parts, the silicate cement of 2.5 ~ 5 parts, the bamboo fibers of the chopped carbon fiber of 12 ~ 24 parts and 6 ~ 12 parts.
The diameter of described chopped carbon fiber is 8 ~ 15um, and the beating degree of bamboo fibers is 75 ~ 90 ° of SR.
Silicate cement strengthens a preparation method for paper friction material, it is characterized in that, comprises the following steps:
1) by phenol formaldehyde resin dissolves in dehydrated alcohol, after resol dissolves completely leave standstill, obtain solution A;
2) sodium lauryl sulphate is dissolved in water, obtains lauryl sodium sulfate aqueous solution, multi-walled carbon nano-tubes is dispersed in lauryl sodium sulfate aqueous solution, through ultrasonic wave dispersion, obtain suspension B;
3) silicate cement is added to the water, obtains suspension C;
4) chopped carbon fiber and bamboo fibers are dispersed in water, obtain suspension D;
5) suspension C and mixing suspension D is mixed, and ultrasonic after, obtain suspension E; Suspension B is joined in suspension E, after concussion, obtain suspension F;
6) poured into by suspension F in fluffer after dispersion, handsheet on handsheet machine is also dry, obtains print G;
7) by the two sides of solution A even application in print G, hot-forming on vulcanizer after drying, obtain silicate cement and strengthen paper friction material.
In described step 1), time of repose is 20h ~ 30h.
In described step 1), the concentration of solution A is 5.0g/L ~ 15.0g/L.
Described step 2) in the mass concentration of lauryl sodium sulfate aqueous solution be 0.5% ~ 3.0%;
Described step 2), ultrasonic time is 30 ~ 60min in step 5).
In described step 5), the concussion time is 15 ~ 30min.
The number of turns that in described step 6), fluffer rotates is 1000 ~ 3000r.
In described step 7), the hot pressing temperature of vulcanizer is 140 ~ 220 DEG C, and hot pressing time is 350s ~ 600s, and hot pressing pressure is 5 ~ 12MPa.
Relative to prior art, the beneficial effect that the present invention has: the present invention has high cohesiveness and resistant to elevated temperatures silicate cement owing to adopting, makes silicate cement strengthen paper friction material and has good wear resistance; Because the high temperature produced in the wear process of paper friction material can not make cement decompose, thus reduce the wearing and tearing on paper friction material surface, and reduce the usage quantity of resol.Therefore by finely dispersed silicate cement suspended emulsion is joined in paper friction material, paper friction material is made to have strong adhesive property, improve frictional coefficient and the wear resistance of paper friction material, enable it be applied to harsher, complex environment, and reduce the cost of paper friction material.
The present invention effectively improves the over-all properties of Wet-type paper friction material by adding finely dispersed cement suspension, the strong bonding characteristic had to make silicate cement gives full play of in paper friction material, by hot-press vulcanization technique, each component is effectively combined through cement more more tight, thus play toughness reinforcing effect; Make resol infiltrate the inside of paper friction material uniformly and effectively and solidify simultaneously, the friction and wear behavior of paper friction material is improved and makes motor vehicle more stable in the process of braking.
Accompanying drawing explanation
Fig. 1 is the SEM photo after silicate cement of the present invention strengthens paper friction material wearing and tearing.
Embodiment
Below by specific embodiment, the present invention is described in detail.
Embodiment 1
A kind of silicate cement strengthens paper friction material, comprises, the resol of 1.0g by mass fraction, the multi-walled carbon nano-tubes of 0.5g, the sodium lauryl sulphate of 1.25g, the silicate cement of 2.5g, the bamboo fibers of 15g diameter to be the chopped carbon fiber of 8 ~ 15um and 7g beating degree be 75 ~ 90 ° of SR.
The preparation method that the present embodiment mesosilicic acid salt cement strengthens paper friction material is as follows:
1) get 1.0g resol, be dissolved in 200ml dehydrated alcohol, the phenol resin solution of configuration 5.0g/L, leaves standstill 20h, obtains solution A after resol fully dissolves;
2) 1.25g sodium lauryl sulphate is added to the water, obtaining mass concentration is the lauryl sodium sulfate aqueous solution of 0.5%, be that to be dispersed in 250g mass concentration be in sodium lauryl sulphate (SDS) aqueous solution of 0.5% for the multi-walled carbon nano-tubes of 30 ~ 100nm by 0.5g diameter, ultrasonic wave dispersion 35min obtains suspension B;
3) 2.5g silicate cement is joined in 97.5g water, stir, obtain suspension C.
4) be the chopped carbon fiber of 8 ~ 15um by 15g diameter, 7g beating degree is that the bamboo fibers of 75 ~ 90 ° of SR is dispersed in water completely, obtains suspension D.
5) suspension C and suspension D is mixed, and ultrasonic 35min, obtain suspension E, and then suspension B is poured in suspension E, shake 15min on the oscillator, obtain suspension F.
6) poured in fluffer by suspension F and disperse 1000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 160 DEG C, and hot pressing time is 350s, and hot pressing pressure is 6MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 2
A kind of silicate cement strengthens paper friction material, comprises, the resol of 2.0g by mass fraction, the multi-walled carbon nano-tubes of 0.7g, the sodium lauryl sulphate of 2.5g, the silicate cement of 5g, the bamboo fibers of 20g diameter to be the chopped carbon fiber of 8 ~ 15um and 9g beating degree be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) get 2.0g resol, be dissolved in 200ml dehydrated alcohol, the phenol resin solution of configuration 10.0g/L, leaves standstill 25h, obtains solution A after resol fully dissolves;
2) 2.5g sodium lauryl sulphate is added to the water, obtaining mass concentration is the lauryl sodium sulfate aqueous solution of 0.5%, be that to be dispersed in 250g mass concentration be in sodium lauryl sulphate (SDS) aqueous solution of 1.0% for the multi-walled carbon nano-tubes of 30 ~ 100nm by 0.7g diameter, ultrasonic wave dispersion 45min obtains suspension B;
3) 5g silicate cement is joined in 95g water, stir, obtain suspension C.
4) be the chopped carbon fiber of 8 ~ 15um by 20g diameter, 9g beating degree is that the bamboo fibers of 75 ~ 90 ° of SR is dispersed in water completely, obtains suspension D.
5) suspension C and suspension D is mixed, and ultrasonic 45min, obtain suspension E, and then poured in suspension E by suspension B, obtain suspension F, shake 20min on the oscillator, sealing is preserved.
6) poured in fluffer by suspension F and disperse 2000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 180 DEG C, and hot pressing time is 450s, and hot pressing pressure is 8MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 3
A kind of silicate cement strengthens paper friction material, comprises, the resol of 3.0g by mass fraction, the multi-walled carbon nano-tubes of 8.0g, the sodium lauryl sulphate of 7.5g, the silicate cement of 3g, the bamboo fibers of the diameter of 24g to be 8 ~ 15um chopped carbon fiber and 11g beating degree be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) get 3.0g resol, be dissolved in 200ml dehydrated alcohol, the phenol resin solution of configuration 15.0g/L, leaves standstill 30h, obtains solution A after resol fully dissolves;
2) 7.5g sodium lauryl sulphate is added to the water, obtaining mass concentration is the lauryl sodium sulfate aqueous solution of 3.0%, be that to be dispersed in 250g mass concentration be in sodium lauryl sulphate (SDS) aqueous solution of 3.0% for the multi-walled carbon nano-tubes of 30 ~ 100nm by 8.0g diameter, ultrasonic wave dispersion 55min obtains suspension B;
3) 3g silicate cement is joined in 97g water, stir, obtain suspension C.
4) be the chopped carbon fiber of 8 ~ 15um by 24g diameter, 11g beating degree is that the bamboo fibers of 75 ~ 90 ° of SR is dispersed in water completely, obtains suspension D.
5) suspension C and suspension D is mixed, and ultrasonic 55min, obtain suspension E, and then suspension B is poured in suspension E, shake 25min on the oscillator, obtain suspension F.
6) poured in fluffer by suspension F and disperse 3000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 200 DEG C, and hot pressing time is 600s, and hot pressing pressure is 10MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 4
A kind of silicate cement strengthens paper friction material, comprises, the resol of 2.0g by mass fraction, the multi-walled carbon nano-tubes of 3.0g, the sodium lauryl sulphate of 4g, the silicate cement of 4g, the bamboo fibers of 12g diameter to be the chopped carbon fiber of 8 ~ 15um and 6g beating degree be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) get 2.0g resol, be dissolved in 200ml dehydrated alcohol, the phenol resin solution of configuration 10.0g/L, leaves standstill 22h, obtains solution A after resol fully dissolves;
2) 4g sodium lauryl sulphate is added to the water, obtaining mass concentration is the lauryl sodium sulfate aqueous solution of 1.6%, be that to be dispersed in 250g mass concentration be in sodium lauryl sulphate (SDS) aqueous solution of 1.6% for the multi-walled carbon nano-tubes of 30 ~ 100nm by 3g diameter, ultrasonic wave dispersion 60min obtains suspension B;
3) 4g silicate cement is joined in 96g water, stir, obtain suspension C.
4) be the chopped carbon fiber of 8 ~ 15um by 12g diameter, 6g beating degree is that the bamboo fibers of 75 ~ 90 ° of SR is dispersed in water completely, obtains suspension D.
5) suspension C and suspension D is mixed, and ultrasonic 30min, obtain suspension E, and then poured in suspension E by suspension B, obtain suspension F, shake 30min on the oscillator, sealing is preserved.
6) poured in fluffer by suspension F and disperse 2000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 140 DEG C, and hot pressing time is 400s, and hot pressing pressure is 5MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 5
A kind of silicate cement strengthens paper friction material, comprises, the resol of 3.0g by mass fraction, the multi-walled carbon nano-tubes of 5.0g, 6g sodium lauryl sulphate, the silicate cement of 3.5g, the bamboo fibers of 18g diameter to be the chopped carbon fiber of 8 ~ 15um and 12g beating degree be 75 ~ 90 ° of SR.
The preparation method that the present embodiment mesosilicic acid salt cement strengthens paper friction material is as follows:
1) get 3.0g resol, be dissolved in 200ml dehydrated alcohol, the phenol resin solution of configuration 15.0g/L, leaves standstill 28h, obtains solution A after resol fully dissolves;
2) 6g sodium lauryl sulphate is added to the water, obtaining mass concentration is the lauryl sodium sulfate aqueous solution of 2.4%, be that to be dispersed in 250g mass concentration be in sodium lauryl sulphate (SDS) aqueous solution of 2.4% for the multi-walled carbon nano-tubes of 30 ~ 100nm by 5g diameter, ultrasonic wave dispersion 40min obtains suspension B;
3) 3.5g silicate cement is joined in 96.5g water, stir, obtain suspension C.
4) be the chopped carbon fiber of 8 ~ 15um by 18g diameter, 12g beating degree is that the bamboo fibers of 75 ~ 90 ° of SR is dispersed in water completely, obtains suspension D.
5) suspension C and suspension D is mixed, and ultrasonic 60min, obtain suspension E, and then suspension B is poured in suspension E, shake 30min on the oscillator, obtain suspension F.
6) poured in fluffer by suspension F and disperse 3000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 220 DEG C, and hot pressing time is 500s, and hot pressing pressure is 12MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 6
A kind of silicate cement strengthens paper friction material, by mass fraction, comprise the resol of 1.0 parts, the multi-walled carbon nano-tubes of 4 parts, the sodium lauryl sulphate of 7.5 parts, the silicate cement of 2.5 parts, the bamboo fibers of 24 parts of diameters to be the chopped carbon fiber of 8 ~ 15um and 6 parts of beating degrees be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) by phenol formaldehyde resin dissolves in 200mL dehydrated alcohol, after resol dissolves completely leave standstill 25h, obtain solution A;
2) being dissolved in water by sodium lauryl sulphate, obtaining 250g lauryl sodium sulfate aqueous solution, is that the multi-walled carbon nano-tubes of 30 ~ 100nm is dispersed in lauryl sodium sulfate aqueous solution by diameter, through ultrasonic wave dispersion 60min, obtains suspension B;
3) silicate cement is added to the water, stirs, obtain suspension C;
4) bamboo fibers of to be the chopped carbon fiber of 8 ~ 15um and beating degree by diameter be 75 ~ 90 ° of SR is dispersed in water, and obtains suspension D;
5) suspension C and mixing suspension D is mixed, and after ultrasonic 30min, obtain suspension E; Suspension B is joined in suspension E, shakes 30min on the oscillator, obtain suspension F;
6) poured in fluffer by suspension F and disperse 3000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 180 DEG C, and hot pressing time is 350s, and hot pressing pressure is 5MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 7
A kind of silicate cement strengthens paper friction material, by mass fraction, comprise the resol of 3.0 parts, the multi-walled carbon nano-tubes of 0.5 part, the sodium lauryl sulphate of 4 parts, the silicate cement of 5 parts, the bamboo fibers of 18 parts of diameters to be the chopped carbon fiber of 8 ~ 15um and 9 parts of beating degrees be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) by phenol formaldehyde resin dissolves in 200mL dehydrated alcohol, after resol dissolves completely leave standstill 20h, obtain solution A;
2) being dissolved in water by sodium lauryl sulphate, obtaining 250g lauryl sodium sulfate aqueous solution, is that the multi-walled carbon nano-tubes of 30 ~ 100nm is dispersed in lauryl sodium sulfate aqueous solution by diameter, through ultrasonic wave dispersion 50min, obtains suspension B;
3) silicate cement is added to the water, stirs, obtain suspension C;
4) bamboo fibers of to be the chopped carbon fiber of 8 ~ 15um and beating degree by diameter be 75 ~ 90 ° of SR is dispersed in water, and obtains suspension D;
5) suspension C and mixing suspension D is mixed, and after ultrasonic 40min, obtain suspension E; Suspension B is joined in suspension E, shakes 20min on the oscillator, obtain suspension F;
6) poured in fluffer by suspension F and disperse 2000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 140 DEG C, and hot pressing time is 600s, and hot pressing pressure is 12MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
Embodiment 8
A kind of silicate cement strengthens paper friction material, by mass fraction, comprise the resol of 2 parts, the multi-walled carbon nano-tubes of 8 parts, the sodium lauryl sulphate of 1.25 parts, the silicate cement of 4 parts, the bamboo fibers of 12 parts of diameters to be the chopped carbon fiber of 8 ~ 15um and 12 parts of beating degrees be 75 ~ 90 ° of SR.
The preparation method that the present embodiment silicate cement strengthens paper friction material is as follows:
1) by phenol formaldehyde resin dissolves in 200mL dehydrated alcohol, after resol dissolves completely leave standstill 30h, obtain solution A;
2) being dissolved in water by sodium lauryl sulphate, obtaining 250g lauryl sodium sulfate aqueous solution, is that the multi-walled carbon nano-tubes of 30 ~ 100nm is dispersed in lauryl sodium sulfate aqueous solution by diameter, through ultrasonic wave dispersion 30min, obtains suspension B;
3) silicate cement is added to the water, stirs, obtain suspension C;
4) bamboo fibers of to be the chopped carbon fiber of 8 ~ 15um and beating degree by diameter be 75 ~ 90 ° of SR is dispersed in water, and obtains suspension D;
5) suspension C and mixing suspension D is mixed, and after ultrasonic 60min, obtain suspension E; Suspension B is joined in suspension E, shakes 15min on the oscillator, obtain suspension F;
6) poured in fluffer by suspension F and disperse 1000r, take out the suspension F after discongesting, handsheet on handsheet machine is also dry, obtains print G;
7) first by solution A spray injection device, then by the two sides of solution A even application in print G, after it dries naturally, hot-forming on vulcanizer, the hot pressing temperature controlling vulcanizer is 220 DEG C, and hot pressing time is 500s, and hot pressing pressure is 8MPa, obtain silicate cement and strengthen paper friction material, its friction and wear behavior is stablized.
See Fig. 1, Fig. 1 is the SEM photo after friction materials of the present invention wearing and tearing, as can be seen from Figure 1, the surface abrasion that silicate cement prepared by the present invention strengthens paper friction material is little, thus improve the wear resistance of paper friction material, and then make the friction and wear behavior of paper friction material more stable.
The invention provides the preparation method that a kind of silicate cement strengthens paper friction material, strengthening paper friction material by adding cement suspension.Cement suspension directly joins in pulp mixture by present method, paper friction material is strengthened with the strong adhesive property making paper friction material have through cement, improve frictional coefficient and the wear resistance of paper friction material, and then by hot-press vulcanization technique make to combine between each component more tight, thus play toughness reinforcing effect.
The invention provides a kind of method preparing silicate cement enhancing paper friction material, effectively improving the over-all properties of Wet-type paper friction material by adding finely dispersed cement suspension.At normal temperatures, add the suspension of finely dispersed cement, by the strong adhesive property that cement itself has, the interfacial bonding property between various material in paper friction material can be strengthened, to improve the stability in the friction and wear behavior of paper-base friction wafer and braking procedure.
Claims (2)
1. a silicate cement strengthens paper friction material, it is characterized in that, comprise by mass fraction, the resol of 1.0 ~ 3.0 parts, the multi-walled carbon nano-tubes of 0.5 ~ 8.0 part, the sodium lauryl sulphate of 1.25 ~ 7.5 parts, the silicate cement of 2.5 ~ 5 parts, the bamboo fibers of the chopped carbon fiber of 12 ~ 24 parts and 6 ~ 12 parts;
The diameter of described chopped carbon fiber is 8 ~ 15 μm, and the beating degree of bamboo fibers is 75 ~ 90 ° of SR.
2. a kind of silicate cement according to claim 1 strengthens the preparation method of paper friction material, it is characterized in that, comprises the following steps:
1) by phenol formaldehyde resin dissolves in dehydrated alcohol, after resol dissolves completely leave standstill, obtain solution A;
2) sodium lauryl sulphate is dissolved in water, obtains lauryl sodium sulfate aqueous solution, multi-walled carbon nano-tubes is dispersed in lauryl sodium sulfate aqueous solution, through ultrasonic wave dispersion, obtain suspension B;
3) silicate cement is added to the water, stirs, obtain suspension C;
4) chopped carbon fiber and bamboo fibers are dispersed in water, obtain suspension D;
5) suspension C and mixing suspension D is mixed, and ultrasonic after, obtain suspension E; Suspension B is joined in suspension E, through vibrator obtains suspension F after concussion;
6) poured into by suspension F in fluffer after dispersion, handsheet on handsheet machine is also dry, obtains print G;
7) by solution A spray injection device, then by the two sides of solution A even application in print G, hot-forming on vulcanizer after drying, obtain silicate cement and strengthen paper friction material;
Described step 5) in the concussion time be 15 ~ 30min;
Described step 6) in fluffer rotate the number of turns be 1000 ~ 3000r;
Described step 7) in the hot pressing temperature of vulcanizer be 140 ~ 220 DEG C, hot pressing time is 350s ~ 600s, and hot pressing pressure is 5 ~ 12MPa;
Described step 1) in time of repose be 20h ~ 30h;
Described step 1) in the concentration of solution A be 5.0g/L ~ 15.0g/L;
Described step 2) in the mass concentration of lauryl sodium sulfate aqueous solution be 0.5% ~ 3.0%;
Described step 2), step 5) in ultrasonic time be 30 ~ 60min.
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| CN103396764A (en) | 2013-11-20 |
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