Modified polyurethane/unsaturated polyester resin dibasic alcohol preparation method
A technology of polyester diol and polyester resin is applied in the field of preparation of flexible unsaturated polyester diol, which can solve the problems of high preparation cost, complicated operation and cumbersome operation, and achieve excellent product performance and controllable curing process. Effect
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[0019] Example 1
[0020] The aggregation steps are as follows:
[0021] 1. Preparation of polyester resin prepolymer:
[0022] Propylene glycol was added, the temperature was raised to 80° C., and isophthalic acid was added (the molar ratio of dihydric alcohol and saturated dibasic acid was 1-1.05:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C / h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH / g, the temperature was lowered to 180°C.
[0023] 2. Preparation of flexible unsaturated polyester diols:
[0024] Add 0.1 mole of hydroxyl-terminated polybutadiene with a molecular weight of 1200, 1.2 moles of diethylene glycol, and 1 mole of maleic anhydride (hydroxyl-terminated flexible macromolecular diol: moles of diol and unsaturated dibasic acid) The ratio is 0.1:1.2:1). The temperature was raised to 210°C at a heating rate of 10°C / h, ...
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[0027] Example 2
[0028] The aggregation steps are as follows:
[0029] 1. Preparation of polyester resin prepolymer:
[0030] 1.03 moles of propylene glycol was added, the temperature was raised to 80° C., and 1 mole of terephthalic acid was added (the molar ratio of dihydric alcohol and saturated dibasic acid was 1.03:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C / h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH / g, the temperature was lowered to 180°C.
[0031] 2. Preparation of flexible unsaturated polyester diols:
[0032] Add 0.2 moles of hydroxy-terminated styrene-butadiene liquid rubber with a molecular weight of 2000 again, 1.5 moles of diethylene glycol, and 1 mole of maleic anhydride (hydroxyl-terminated flexible macromolecular diols: moles of diols and unsaturated dibasic acids) The ratio is 0.2:1.5:1). The temperature...
Example Embodiment
[0035] Example 3
[0036] The aggregation steps are as follows:
[0037] 1. Preparation of polyester resin prepolymer:
[0038] 1.05 moles of butanediol was added, the temperature was raised to 80° C., and 1 mole of phthalic anhydride was added (the molar ratio of glycol and saturated dibasic acid was 1.05:1). The temperature was raised to 150 °C within 1 h, and then increased to 210 °C at a heating rate of 10 °C / h. Condensation polymerization was carried out at 180°C for 3 hours under nitrogen, and when the acid value was less than 20 mgKOH / g, the temperature was lowered to 180°C.
[0039] 2. Preparation of flexible unsaturated polyester diols:
[0040]Add 0.15 moles of hydroxyl-terminated hydrogenated polybutadiene with a molecular weight of 1500, 1.4 moles of diethylene glycol, and 1 mole of maleic anhydride (hydroxyl-terminated flexible macromolecular diol: diol and unsaturated dibasic acid) The molar ratio was 0.15:1.4:1). The temperature was raised to 210°C at a hea...
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