Polyurethane polyol for high-strength and high-glossiness polyurethane and preparation process thereof
A polyester polyol and high gloss technology, applied in the field of polyurethane polyol and its preparation technology, can solve the problems of no mention and large gap, and achieve the effects of high production efficiency, simple equipment and important application value
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Embodiment 1
[0019] In a 2000ml reactor, add 1000g of 1,4-cyclohexanedicarboxylic acid and 900g of 1,4-cyclohexanedimethanol respectively, feed nitrogen, raise the temperature to 140°C for 2 hours, and then raise the temperature to 160°C for 1 hour. Then raise the temperature to 180°C for 1 hour, then raise the temperature to 225°C for 1 hour, then add 30ppm of catalyst (tetraisopropyl titanate is used in this example), and then carry out vacuum operation, the vacuum degree is controlled at 200Pa, and continue to react for 3 hours , After testing that the acid value is less than 1, the material is cooled and discharged, and the molecular weight is 1000 as detected by the instrument.
Embodiment 2
[0021] In a 2000ml reactor, add 1000g of 1,4-cyclohexanedicarboxylic acid and 800g of 1,4-cyclohexanedimethanol respectively, feed nitrogen, raise the temperature to 140°C for 2 hours, and then raise the temperature to 160°C for 1 hour. Then raise the temperature to 180°C for 1 hour, then raise the temperature to 225°C for 1 hour, then add 40ppm of catalyst (tetraisopropyl titanate is used in this example), and then perform vacuum operation, the vacuum degree is controlled at 100Pa, and continue to react for 4 hours , After testing that the acid value is less than 1, the material is cooled and discharged, and the molecular weight is 2000 as detected by the instrument.
Embodiment 3
[0023] In a 2000ml reactor, add 1000g of 1,4-cyclohexanedicarboxylic acid and 720g of 1,4-cyclohexanedimethanol respectively, pass in nitrogen, raise the temperature to 140°C for 2 hours, and then raise the temperature to 160°C for 1 hour. Then raise the temperature to 180°C for 1 hour, then raise the temperature to 225°C for 1 hour, then add 60ppm of catalyst (tetraisopropyl titanate is used in this example), and then perform vacuum operation, the vacuum degree is controlled at 100Pa, and continue to react for 6 hours , After testing that the acid value is less than 1, the material is cooled and discharged, and the molecular weight is 3000 as detected by the instrument.
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