A kind of preparation method of resorcinol formaldehyde resin for alkylphenol modified rubber adhesive
A technology of resorcinol formaldehyde resin and modified rubber, which is applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., and can solve complex production processes, high water content of products, and easy water absorption Agglomeration and other problems, to achieve the effects of reduced risk, low reaction temperature, and low water absorption
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Embodiment 1
[0023] Put 400kg of p-octylphenol, 400kg of m-cresol, 800L of toluene, and 250kg of paraformaldehyde into the reaction kettle and stir for half an hour. After stirring for half an hour, the temperature was raised to 50°C, and 60.5kg of sodium hydroxide solution with a mass fraction of 25% was added dropwise. After the dropwise addition, keep the temperature at 50-55°C for 3 hours, raise the temperature to 95°C after the end of the heat preservation, and keep the temperature for 3 hours; cool down to below 80°C, add 15kg of oxalic acid, and stir for 30 minutes; put in 660kg of resorcinol, and heat up to 100 Reflux at ℃, react for 5 hours, remove toluene by distillation at atmospheric pressure until the temperature of the kettle is about 150℃, start to distill toluene under reduced pressure, control the vacuum degree to be higher than 0.08MPa during decompression, and keep the temperature of the kettle at about 160℃, take samples every hour to detect the softening point, When the...
Embodiment 2
[0025] Put 420kg of p-octylphenol, 420kg of p-cresol, 800L of toluene, and 250kg of paraformaldehyde into the reactor and stir for half an hour. After stirring for half an hour, the temperature was raised to 50°C, and 60.5kg of sodium hydroxide solution with a mass fraction of 25% was added dropwise. After the dropwise addition, keep the temperature at 50-55°C for 3 hours, raise the temperature to 95°C after the end of the heat preservation, and keep the temperature for 3 hours; cool down to below 80°C, add 15kg of oxalic acid, and stir for 30 minutes; put in 660kg of resorcinol, and heat up to 150 Reflux at ℃, react for 5 hours, remove toluene by atmospheric pressure distillation until the temperature of the kettle is about 150℃, start to distill toluene under reduced pressure, control the vacuum degree to be higher than 0.08MPa during decompression, and keep the temperature of the kettle at about 160℃, take samples every hour to detect the softening point, When the softening ...
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