Polyester, aqueous composition including polyester and preparation method of aqueous composition, double-component paint including aqueous composition and preparation method of double-component paint
A water-based composition, polyester technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as unstable performance
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[0073] Preparation of Aqueous Compositions: The synthetic components of Examples 1.1, 2.1, 3.1 and Comparative Example 7.1 are shown in Table 3 below.
[0074]
[0075] 1) The raw materials 1 to 6 in the above table 3 are placed in the reactor, and after the temperature is rapidly raised to 160 °C, the temperature is kept not more than 160 °C, and the reflux reaction is performed for 1 to 1.5 hours.
[0076] 2) The temperature is lowered to 100°C, a water separator is installed on the reactor, and the temperature is increased to 220°C at a rate of 10°C per hour, and maintained for 1 to 2 hours.
[0077] 3) When the acid value of the reaction system (raw material 1~raw material 6) drops to within the range of 15~20mgKOH / g polyester (solid) and the temperature drops below 100°C, add raw material 7 and raise the temperature to 200°C, keep When the temperature does not exceed 200°C, the reaction is carried out until the acid value of the reaction system before neutralization re...
Example Embodiment
[0096] The average score of Examples 1.1 to 1.6 is 3 (good);
Example Embodiment
[0097] The average score of Examples 2.1~2.2 is 4 (very good);
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