Preparation method of phenolic resin-based composite friction material
A composite friction material and phenolic resin technology, applied in the field of friction materials, can solve the problems of poor toughness, brittle and hard benzene ring texture, unfavorable bonding performance and molding processing conditions, and achieve low elastic modulus, reduced hydrophilicity, The effect of improving thermal stability
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Embodiment 1
[0037] In terms of parts by weight, weigh 30 parts of phenol, 60 parts of formaldehyde with a mass fraction of 30%, and 15 parts of boric acid, add phenol to formaldehyde, and stir the reaction at 200 r / min in an oil bath at 80°C for 1 hour to obtain The reactant, put the reactant in an oil bath at 140°C, stir the reaction at a speed of 240r / min under a reduced pressure of -0.08MPa for 1h to obtain a dehydrated reactant, add boric acid to the dehydrated reactant, Stir and react at 280r / min in an oil bath for 1 hour, cool at room temperature to obtain a phenolic resin; then weigh 20 parts of nano-silica, 2 parts of dimethyldimethoxysilane, 4 parts of Stearic acid, 40 parts of absolute ethanol, 40 parts of deionized water, dimethyldimethoxysilane and stearic acid were added to absolute ethanol, stirred at 180r / min for 20min in a water bath at 40°C, To obtain a mixed alcohol solution, add the mixed alcohol solution to deionized water, stir at a speed of 200r / min for 30min in a wa...
Embodiment 2
[0039] In terms of parts by weight, weigh 35 parts of phenol, 70 parts of formaldehyde with a mass fraction of 30%, and 17 parts of boric acid, add phenol to formaldehyde, and stir and react at 220r / min in an oil bath at 85°C for 1.5h. To obtain a reactant, place the reactant in an oil bath at 150°C, stir and react at a speed of 260r / min under a reduced pressure of -0.07MPa for 1.5h to obtain a dehydrated reactant, add boric acid to the dehydrated reactant, and Under the condition of an oil bath at 290r / min, the reaction was stirred for 1.5h, cooled at room temperature to obtain a phenolic resin; and then weighed 25 parts by weight of nano-silica, 2.5 parts of dimethyldimethoxysilane , 5 parts of stearic acid, 50 parts of absolute ethanol, and 50 parts of deionized water, add dimethyldimethoxysilane and stearic acid to absolute ethanol, and rotate at 190r / min under the condition of a water bath at 45°C Stir for 25 minutes to obtain a mixed alcohol solution, add the mixed alcoh...
Embodiment 3
[0041] In terms of parts by weight, weigh 40 parts of phenol, 80 parts of formaldehyde with a mass fraction of 30%, and 20 parts of boric acid, add phenol to formaldehyde, and stir the reaction at 240r / min in an oil bath at 90°C for 2 hours to obtain The reactant, put the reactant in an oil bath at 160°C, stir the reaction at a speed of 280r / min under a reduced pressure of -0.06MPa for 2h to obtain a dehydrated reactant, add boric acid to the dehydrated reactant, Under oil bath conditions, stir and react at a speed of 300r / min for 2h, and cool at room temperature to obtain a phenolic resin; then weigh 30 parts of nano-silica, 3 parts of dimethyldimethoxysilane, 6 parts of Stearic acid, 60 parts of absolute ethanol, 60 parts of deionized water, dimethyldimethoxysilane and stearic acid were added to absolute ethanol, stirred at 200r / min for 30min in a water bath at 50°C, To obtain a mixed alcohol solution, add the mixed alcohol solution to deionized water, stir for 40 minutes at...
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