Method of catalyzing esterification of carboxylic acid and expoxy compound
An epoxy compound and esterification technology, which is applied in the preparation of organic compounds, the preparation of carboxylate, chemical instruments and methods, etc., can solve the limitations of the manufacture and application of epoxy acrylate, and the storage instability of epoxy acrylate, etc. problem, to achieve the effect of good catalytic activity, small viscosity change and high catalytic efficiency
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Embodiment 1
[0017] Add 57g epoxy E-51 (epoxy value 5.10mol / kg) into a 250ml three-necked round bottom flask, stir mechanically, oil bath at 120℃, and take 10.32g acrylic acid (0.1435mol), 0.3610g tris(acetylacetone) complex Iron (III) and 0.0612g p-hydroxyanisole were mixed and added to the epoxy resin. After stirring and reacting for 3 hours, the conversion rate of acrylic acid in the system reached 99.2%. The viscosity of the reaction obtained after half-esterification was placed for half a year and the viscosity increased little after half a year. .
Embodiment 2
[0019] Add 117.5 g of epoxy 828 (epoxy value 5.26 to 5.42 mol / kg) into a 250 ml three-necked round bottom flask. Mechanical stirring, oil bath at 110°C, another 23.33g acrylic acid (0.3237mol), 0.2143g tetrakis (acetylacetone) zirconium (IV), 0.1342g p-hydroxyanisole, mixed and added to epoxy resin, stirring After 7 hours of reaction, the conversion rate of acrylic acid in the system reached 98.5%.
Embodiment 3
[0021] Add 86.5g epoxy 827 (epoxy value 5.43-5.59mol / kg) into a 250ml three-necked round bottom flask, mechanically stir, oil bath at 80℃, take another 0.3548g tris(acetylacetone) complex iron (III) and 0.1 023g p-hydroxyanisole was dissolved in 17.17g acrylic acid (0.2383mol), and then added to the epoxy resin. After stirring and reacting for 5 hours, the conversion rate of acrylic acid in the system reached 98.7%. At 80°C, tris(acetylacetone) complex Iron (III) still has a strong catalytic effect on the esterification reaction of acrylic acid and epoxy.
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Abstract
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