High-performance aqueous alkyd resin paint
A water-based alkyd resin and alkyd resin technology, applied in polyester coatings, coatings, etc., can solve the problems of low conversion rate of modified monomers, limited proportions, reduced coating stability, etc., and achieve good storage stability. Effect
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[0139] Preparation method of water-based alkyd resin coating
[0140] The preparation method of the alkyd resin coating for water-based baking paint of the present invention includes the following steps:
[0141] (a) Under an inert atmosphere, react vegetable oil fatty acids, neopentyl glycol, isophthalic acid, and trimethylolpropane under the action of an esterification catalyst to obtain oily alkyd resin;
[0142] (b) Under an inert atmosphere, trimellitic anhydride and the oily alkyd resin prepared in step (a) undergo an esterification reaction. When the acid value is 40-70mgKOH / g, an oily alkyd with excess carboxyl groups is prepared Resin
[0143] (c) Using a co-solvent to dilute the oily alkyd resin with excess carboxyl groups prepared in step (b), add a neutralizer to neutralize, and the degree of neutralization is 80-100% to prepare the water-based alkyd resin;
[0144] (d) Using the water-based alkyd resin prepared in step (c) as a base material, adding water-based amino resin...
Embodiment 1
[0204] Preparation of water-based alkyd resin coating
[0205] (1) Preparation of oily alkyd resin: 46.4g of coconut oil fatty acid, 18.6g of neopentyl glycol, 33.4g of trimethylolpropane, 27.9g of isophthalic acid and 0.06g of The triphenyl phosphite was introduced into nitrogen, mechanically stirred, the temperature was raised to 230°C, and the temperature was kept for 1 hour to obtain an oily alkyd resin with an acid value of 13.5 mgKOH / g.
[0206] (2) Preparation of oily alkyd resin with excess carboxyl groups: 16.7g of trimellitic anhydride is directly reacted with the oily alkyd resin prepared in step (1), and nitrogen is supplied. The esterification temperature is maintained at 175°C for esterification In 1.5 hours, 100.0 g of oily alkyd resin with excess carboxyl groups with an acid value of 62.98 mgKOH / g was prepared.
[0207] (3) Preparation of alkyd resin for water-based baking paint: The oily alkyd resin with excess carboxyl groups prepared in step (2) is cooled to 80°C,...
Embodiment 2
[0210] Preparation of water-based alkyd resin coating
[0211] (1) Preparation of oily alkyd resin: 46.4g of coconut oil fatty acid, 18.6g of neopentyl glycol, 33.4g of trimethylolpropane, 27.9g of isophthalic acid and 0.06g of The triphenyl phosphite was blown into nitrogen, mechanically stirred, the temperature was raised to 230° C., and the temperature was kept for 0.5 hours to obtain an oily alkyd resin with an acid value of 19.8 mgKOH / g.
[0212] (2) Preparation of oily alkyd resin with excess carboxyl groups: 16.7g of trimellitic anhydride is directly reacted with the oily alkyd resin prepared in step (1), and nitrogen is supplied. The esterification temperature is maintained at 175°C for esterification In 1.5 hours, 100.0 g of oily alkyd resin with excess carboxyl groups with an acid value of 69.81 mgKOH / g was prepared.
[0213] (3) Preparation of alkyd resin for water-based baking paint: The oily alkyd resin with excess carboxyl groups prepared in step (2) is cooled to 80°C,...
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Abstract
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