Synthesis of liquid end hydroxy polybutadiene-styrene rubber
A hydroxyl-terminated polybutadiene and liquid rubber technology, applied in the field of free radical polymerization, can solve the problems of turbidity and opacity of the polymer, increase in viscosity, and high peroxide content in the liquid polymer, and achieve narrow molecular weight distribution, high molecular weight, good transparency
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Embodiment 1
[0018] Add monomer (butadiene / styrene is 85 / 15) 14.5Kg, industrial ethanol 12.9Kg, dicumyl hydroperoxide-hydrogen peroxide 3.0Kg, dodecyl sulfide in 50L stainless steel pressure-resistant polymerization kettle Alcohol 0.25Kg, start the reaction polymerization tank to stir, when the temperature rises to 128°C reaction temperature, maintain the reaction at the reaction temperature for 4 hours until the polymerization reaction ends. Add 0.65Kg of hydroquinone to the crude polymer glue, continue to stir and react. After the reaction is completed, wash with water and let it stand for 24 hours. After drying in a desiccator, add 0.032kg of 2246 anti-aging agent, and filter through a filter to obtain Hydroxyl-terminated polybutadiene-styrene liquid polymer. Its main physical properties are: number average molecular weight 2843, hydroxyl value 0.706mmol / g, viscosity 12.2Pa.s, bound styrene 15.4%, dispersion index 1.95, average functionality 2.1, no peroxide detected.
Embodiment 2
[0020] Add 25% (butadiene / styrene is 75 / 25) 4.04Kg of total amount monomer in 50L stainless steel pressure-resistant polymerizer, industrial acetone 5.0Kg, hydrogen peroxide p-menthane-hydrogen peroxide 3.0Kg, B Amide 0.03Kg, n-mercaptan 0.25Kg, start the reaction polymerization tank to stir, heat up to 125°C, start feeding once after 1 hour of reaction, add butadiene / styrene (75 / 25) 7.272Kg, industrial acetone-hydrogen peroxide P-menthane-hydrogen peroxide solution 5.3Kg, continue to react for 1 hour and then feed twice, add butadiene / styrene (75 / 25) 4.848Kg, industrial acetone-hydrogen peroxide p-menthane-hydrogen peroxide 1.5Kg . The reaction was continued for 2 hours until the end of the polymerization reaction. Add 0.65Kg of sodium methylene dinaphthalenesulfonate to the crude polymer glue, continue to stir and react for 1 hour until the end of the reaction, wash with water and let stand, dry in a desiccator, add 0.032kg of 2246 anti-aging agent, pass through the filter ...
Embodiment 3
[0022] Add 14.1Kg of monomer (butadiene / styrene is 85 / 15), 11.5Kg of industrial ethanol, 2.1Kg of 30% hydrogen peroxide, and 0.17Kg of dodecyl mercaptan into a 50L stainless steel pressure-resistant polymerization kettle to start the reaction The polymerization tank was stirred, and when the temperature was raised to a reaction temperature of 120° C., the reaction was maintained at the reaction temperature for 4 hours until the polymerization reaction was completed. Add 0.65Kg of p-tert-butylcatechol to the crude polymer glue, and continue to stir and react. After the reaction is completed, wash with water and let it stand for 24 hours. After drying in a desiccator, add 0.026kg of 2246 anti-aging agent and filter through a filter. That is, the hydroxyl-terminated polybutadiene-styrene liquid polymer is obtained. Its main physical properties are: number average molecular weight 3177, hydroxyl value 0.623mmol / g, viscosity 11.6Pa.s, bound styrene 15.12%, dispersion index 1.8, ave...
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