High-solid-content waterborne polyurethane and preparation method thereof
A technology of water-based polyurethane and high solid content, applied in the field of polyurethane materials, can solve the problems of low solid content of water-based polyurethane, and achieve the effect of solving environmental pollution and excellent resistance to ultraviolet aging.
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[0030] EXAMPLE 1 Examples 1 to 5 was prepared according to the following steps:
[0031] . A The dried at 100 ~ 120 ℃ polyhydric alcohols, alcohol chain extender, an amine-based chain extenders, the hydrophilic chain extender agents, a small molecule chain extender in vacuo prior to use class 2 ~ 3h;
[0032] . B The solvent, isocyanates and polyols according to the proportion placed with stirrer, thermometer, reflux condenser and dried three-necked flask;
[0033] c. Continue of the added amount of tin-based catalyst, in N 2 Protected, 40 ~ 60 ℃ reaction 20 ~ 40min, warmed to 70 ~ 80 ℃ reaction was continued for 60 ~ 80min;
[0034] . D proportion of hydrophilic added chain extender, chain extender alcohol was warmed to 90 ~ 95 ℃ reaction 40 ~ 50min, continue to scale amine chain extender was added 30 ~ 40min;
[0035] . E proportionally small molecule chain extender is added to continue the reaction after addition of 30 ~ 40min amount of salt forming agent, the reaction of 5 to ...
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