Isocyanate modified epoxy acrylic ester and preparation thereof

Abstract

The invention discloses a preparation method for isocyanate-modified epoxy acrylate, which comprises the following steps that: the epoxy resin and the inhibitor are added in a reaction vessel and the mixtures are stirred at a speed ranging from 150 to 250r / min so as to raise the temperature to 90 to 100 DEG C; then the mixtures of the acylic acid and the catalysts are added in drop by drop and the obtained mixtures are stirred to carry out a reaction for 3 to 4 hours at a speed ranging from 250 to 350r / min with controlling the temperature to rang 110 to120 DEG C so as to obtain the epoxy acrylate; the temperature of the mixtures in the reactor vessel is lowered to 50 to 60 DEG C and then the isocyanate is added in the mixtures drop by drop, and the mixtures are stirred to conduct the reaction for 0.5 to 2 hours at a speed ranging from 250 to 350r / min so as to obtain the modified epoxy acrylate. The light-cured resin obtained through the method of the invention has lower viscosity and excellent flexibility.

Description

technical field [0001] The invention relates to a resin and a preparation method thereof, in particular to an isocyanate-modified epoxy acrylate and a preparation method thereof. Background technique [0002] In recent years, the world's environmental protection regulations have become more and more perfect, and the requirements have become increasingly stringent. Traditional solvent-based coatings have been greatly impacted by the emission of volatile organic compounds (VOC), while UV-curable coatings (UVCC), water-based coatings, and high-solid coatings Environmentally friendly green coatings represented by sub-coatings and powder coatings have become a focus of attention and research. Compared with other types of coatings, UVCC has fast curing speed, low curing temperature, environmental protection and energy saving, and excellent coating performance. It can be used for coating heat-sensitive substrates such as plastics, paper, and wood. Since 1998, the annual growth rat...

AI Technical Summary

Problems solved by technology

Because reactive diluents have a special pungent smell and high toxicity, they pollute the local environment and cause harm to operators; moreover, reactive diluents are expensive, which increases product costs

Coatings prepared from epoxy acrylate have high brittleness, poor flexibility, and easy cracking, which affect the decorative effect

[0006] Due to the excessive amount of epoxy resin currently used in the synthesis of epoxy acrylate, resulting in the presence of more epoxy groups in the product, the storage stability of the resin is poor; the traditional preparation process often uses a higher reaction temperature, which is likely to cause side effects. reaction, resulting in increased resin viscosity and poor performance

[0007] To sum up, the shortcomings of existing epoxy acrylate production formulas and their preparation processes lead to shorter resin storage periods, poor overall performance, and the need to incorporate more reactive monomers