Preparation method of cationic ultraviolet light curing resin with synergistic water solubility

Abstract

The invention provides a method for preparing a cationic UV-curable resin with synergistic water solubility, which comprises the following steps: synthesizing a polyacrylate segment with a side chain containing a hydroxyl group and an epoxy group as the main chain; synthesizing one end with The urethane acrylate segment of the NCO group is used as a side chain; the above two segments are reacted to obtain a urethane acrylate modified polyacrylate resin containing multiple acrylate double bonds and epoxy groups in the side chain ; Stir the obtained resin evenly, heat up, dropwise add amine, cool after reaction, add acid, then add water, and stir evenly. Adopt the technical scheme of the present invention, the resin that obtains is comb type, has lower viscosity and water-solubility; Wherein the urethane acrylate side chain of grafting has synergistic effect to the water-solubility of whole resin; The degree of cross-linking of the resin is greatly improved, effectively improving the performance of the cured film.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of cationic ultraviolet light curing resin with synergistic water solubility. Background technique [0002] Ultraviolet (UV) curing technology is an environmentally friendly curing technology. After the liquid coating is irradiated by ultraviolet light, a photochemical reaction occurs, which causes polymerization and crosslinking, and the liquid coating becomes a solid film in a short time. Because of its fast curing speed, less environmental pollution, automatic production, suitable for use on heat-sensitive substrates, etc., it is expected to replace traditional solvent-based coatings, adhesives, inks, etc. in industry, and has good applications in most fields. prospect. According to the photocuring mechanism, there are two types of free radical curing and cationic curing. The free radical photocuring system has the advantages of fas...

AI Technical Summary

Problems solved by technology

[0004] At present, many researchers are conducting research on light-curable water-based resins. Most of the early studies made oligomers soluble in water by adding emulsifiers. Such resins need to add emulsifiers to achieve water-based resins. However, The addition of emulsifiers will have a greater impact on the properties of the cured film

Therefore, water-soluble photocurable resins are currently being developed, and hydrophilic functional groups are introduced into the resin structure to achieve this. Most of this type of resin has a linear structure, only one main chain, and its performance is relatively simple. For example, epoxy acrylate has high hardness but is flexible. Poor resistance; polyurethane acrylate has good flexibility and wear resistance, but has disadvantages such as low hardness. In order to obtain a cured film with good comprehensive performance, a variety of resins must be used in combination, and different water-based resins have different water-based ions. Inconsistency makes it difficult to compound and use, and it is difficult to control the curing performance and physical and chemical properties

[0005] In addition, this type of water-based UV-curable resin generally only has acrylate double bonds at both ends, and most of them are difunctional. , wear resistance, alcohol resistance, etc. are not high. In addition, the number of water-based functional groups in its molecular structure is limited, resulting in limited water solubility. It is difficult to dilute with a large amount of water in applications such as spraying

The defects of these water-based resins make it difficult to meet the increasing demands of the industry on the performance of UV-curable coatings, and it also makes it difficult for water-based UV-curable resins to be used on a large scale in the industry.

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