Self-crosslinked oxidation and high-efficient dispersion with water polyurethane and production thereof
A technology of water-based polyurethane and polyurethane prepolymer, which is applied in the field of high-efficiency oxidative self-crosslinking water-based polyurethane dispersion coating and its preparation, and can solve the problems of long drying time, low non-volatile content, and influence on storage stability, etc. Achieve the effect of improving the comprehensive performance of the coating film and good market prospects
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Embodiment 1
[0028] Embodiment 1, the synthesis of polyester polyol resin (A-1).
[0029] (1) Synthetic formula:
[0030] Raw material name Dosage (parts by weight):
[0031] Adipic acid 260;
[0032] Hexahydrophthalic anhydride 300;
[0033] Neopentyl glycol 360;
[0034] Hexylene glycol 120;
[0035] Organotins 1.12.
[0036] (2) Synthesis process:
[0037] Add adipic acid, hexahydrophthalic anhydride, neopentyl glycol, hexanediol and a catalyst into a reactor equipped with a stirrer, a thermometer, a fractionating column and a nitrogen conduit; take 1.5 hours to raise the temperature of the kettle to 160°C for esterification At the beginning of the reaction, water will distill out, reduce the heating rate to make the reaction proceed smoothly, control the temperature of the kettle at about 160-200°C, and keep the temperature at the upper part of the fractionation column at 105°C for 3-4 hours. When the temperature starts to drop, slowly raise the temperature to 220°C, keep warm u...
Embodiment 2
[0038] Embodiment 2, the synthesis of polyester polyol resin (A-2).
[0039] (1) Synthetic formula:
[0040] Raw material name Dosage (parts by weight):
[0041] Adipic acid 371;
[0042] Maleic anhydride 249;
[0043] Trimethylolpropane 10.6;
[0044] Neopentyl glycol 187;
[0045] 1,4-Cyclohexanedimethanol 284;
[0046] Butanediol 179;
[0047] Organotins 1.6.
[0048] (2) The synthesis process is the same as in Example 1. Resin hydroxyl value: 78mgKOH / g (resin), recorded as A-2.
Embodiment 3
[0049] Embodiment 3, the synthesis of polyester polyol resin (A-3).
[0050] (1) Synthetic formula:
[0051] Raw material name Dosage (parts by weight):
[0052] Adipic acid 378;
[0053] 1,4-Cyclohexanedicarboxylic acid 443;
[0054] Trimethylolpropane 16.5;
[0055] Neopentyl glycol 187;
[0056] 1,2-propanediol 150;
[0057] 2-Ethyl-2-butyl-1,3-propanediol 318;
[0058] Organotins 2.2.
[0059] (2) Synthesis process is the same as example 1. Resin hydroxyl value: 50mgKOH / g (resin), recorded as A-3.
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