Aqueous ultraviolet cured epoxy acrylic resin and preparation method thereof

Abstract

The invention discloses an aqueous ultraviolet cured epoxy acrylic resin, which consists of bisphenol A epoxy resin, acrylic acid and maleic anhydride in a mass ratio of 340:144:196. The preparation method of the aqueous ultraviolet cured epoxy acrylic resin comprises: in the presence of polymerization inhibitor and an ionic liquid catalyst, performing a catalytic reaction; adjusting the pH value to 6.8 to 7.2 by using alkali, and adding water to prepare emulsion of which the solid content is 65 to 75 weight percent; and adding a photoinitiator in an amount of 1 to 2 percent based on the mass of the emulsion to obtain the aqueous ultraviolet cured epoxy acrylic resin. In the invention, ionic liquid is used as the catalyst, so a polymerization reaction is accelerated and the reaction is performed in a uniform phase; and as the deionized liquid is used, the operation process is simplified, the environmental pollution is light, and the preparation method is suitable for industrial production of a certain scale and is a green and clear process route.

Description

(1) Technical field [0001] The present invention relates to a water-based ultraviolet curing epoxy acrylate resin and a preparation method thereof, in particular to a water-based ultraviolet curing epoxy acrylate resin synthesized by using acrylic acid and bisphenol A epoxy resin, maleic anhydride and ionic liquid. The preparation method of light curing epoxy acrylate resin. (2) Background technology [0002] Water-based coatings are coatings that use water as a solvent or dispersion medium. The most prominent feature of water-based coatings is that all or most of the organic solvents are replaced by water, and the film-forming substances are uniformly dispersed or dissolved in water in different ways. After drying or curing, they have similar water resistance and physical properties to solvent-based coatings. According to the form of film-forming substances in water, water-based coatings can be divided into water-soluble coatings and water-dispersible coatings. The most i...

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Problems solved by technology

[0005] (2) Without active diluent, there are no problems such as organic volatiles, irritation and odor of coalescents;

[0012] (1) There is water in the system. Before photocuring, too much water needs to be dried to remove water, and the high evaporation heat of water leads to increased energy consumption, which also prolongs production time and reduces production efficiency;

[0013] (2) The high surface tension of water is not easy to infiltrate the substrate, which is easy to cause uneven coating; the wettability of the pigment is poor, which affects the dispersion;

[0014] (3) The gloss of the cured film is low, and the water resistance and washing resistance are poor;

[0015] (4) The stability of the system is relatively poor and sensitive to pH;

[0016] (5) The freezing point of water is relatively high, and antifreeze should be added during transportation and storage; water-based systems are prone to mold growth and require antifungal agents to complicate the formula

Therefore, it can be seen from the structural analysis that ionic liquids are a large class of cationic surfactant compound series, and ionic liquids are used instead of quaternary ammonium salts for the preparation of water-based UV-curable epoxy acrylate resins. No relevant reports have been found so far.

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