Hydroxyl-terminated liquid rubber modified polyester polyol as well as preparation method and application thereof
A technology of liquid rubber and modified polyester, which is applied in the field of hydroxyl-terminated liquid rubber-modified polyester polyol and its preparation and application. It can solve the problems of peeling of polyurethane shoe soles, low primary hydroxyl content, and low primary hydroxyl. Achieve the effect of improving low temperature folding resistance, excellent low temperature resistance and good compatibility
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[0036] Example 1
[0037] Add 6.0kg of ethylene glycol, 6.0kg of 1,4-butadiene glycol, 24.0kg of hydroxy-terminated polybutadiene liquid rubber (molecular weight 250, functionality 1.9), and 24.0kg of ethylene glycol to the reactor. Diacid and 2.4g titanium catalyst, turn on the stirring, start heating to 140℃, keep constant temperature for 2h, stabilize the dehydration speed (pass through the rectification tower, keep the top temperature at 90℃), continue to raise the temperature to 170℃ and turn on the vacuum pump to control the slow vacuum Slowly increase gradually. The temperature was raised to 215°C for transesterification reaction, and nitrogen was introduced to take away the excess polyols and small molecular alcohols. From the time of vacuuming for 5 hours, samples were taken every 2 hours for central control analysis to the final acid value (0.1~0.6) mgKOH / About g, the hydroxyl value is 112.0mgKOH / g, the normal pressure is restored, the temperature is reduced to room t...
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[0038] Example 2
[0039] Add 13.8kg of ethylene glycol, 13.8kg of hydroxy-terminated polybutyronitrile liquid rubber (molecular weight 500, functionality 2.4), 32.4kg of adipic acid and 5.6g of titanium catalyst to the reaction kettle, turn on the stirring , When the temperature is raised to 160℃, keep the temperature constant for 2h, stabilize the dehydration speed (pass through the rectification tower, keep the top temperature at 105℃), continue to heat up to 190℃, turn on the vacuum pump, and control the vacuum to gradually increase. The temperature was raised to 235°C for transesterification reaction, and nitrogen gas was introduced to take away the excess polyols and small molecular alcohols. From the time of vacuuming for 5h, samples were taken every 2h for central control analysis to the final acid value (0.1~0.6) mgKOH / g, the hydroxyl value is 56.0mgKOH / g, return to normal pressure, drop to room temperature, and store after discharge to obtain liquid rubber modified pol...
Example Embodiment
[0040] Example 3
[0041] Add 7.4kg of ethylene glycol, 7.4kg of 1,4-butanediol, 14.8kg of hydroxy-terminated polybutyronitrile liquid rubber (molecular weight 500, functionality 2.4), and 30.4kg of hexamethylene to the reactor. Acid and 6.6g titanium catalyst, turn on the stirring, start to heat up to 160℃ and keep the temperature constant for 2h, stabilize the dehydration speed (pass through the rectification tower, keep the top temperature at 105℃), continue to heat up to 190℃, turn on the vacuum pump, control the vacuum slowly Gradually increase. The temperature was raised to 235°C for transesterification reaction, and nitrogen gas was introduced to take away the excess polyols and small molecular alcohols. From the time of vacuuming for 5h, samples were taken every 2h for central control analysis to the final acid value (0.1~0.6) mgKOH / g, the hydroxyl value is 56.0mgKOH / g, return to normal pressure, drop to room temperature, and store after discharge to obtain liquid rubbe...
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