Study On The Properties Of Oxetane/Acrylate UV-cured Hybrid System

UV-curing has enjoyed steady growth in demand and usage, and has become oneof the fastest growing coating technology in the world. UV-curing is well-known tobe one of the most efficient methods for producing quasi-instant and highlycross-linked polymer materials. Due to its unique advantage of good mechanical andchemical properties, UV-curing coating has been widely used in many areas. Themain contents in this paper were as follows:Firstly，a novel reactive diluent4-tert-butyl phenol glycidyl ether acrylate wassynthesized with4-tert-butyl phenol glycidyl ether and acrylic acid as the mainmaterials, triphenylphosphine as the catalyst, and p-hydroxyanisole as the inhibitor.By investigating the reaction conversion, the color of product, and the viscosity of thesystem, the experiment results showed that the optimum conditions were: the reactiontemperature100-110℃, the mass fraction of triphenylphosphine was0.7wt%-0.9wt%, the mass fraction of p-hydroxyanisole0.2wt%-0.3wt%. The UV-curing coatingwas prepared with the synthesized reactive diluent, the photoinitiator and bisphenol-Aepoxy acrylate resin. The tensile test, hardness test and flexibility test were performedfor the UV-curing films. The results showed that the coating had good mechanical andthermal properties.Secondly, the synthesized diluent, oxetane and bisphenol-A epoxy acrylate weremixed together, a certain amount of photoinitiator was added into mixture to preparea novel UV-curing hybrid system. The synergistic effect of photoinitiators wasresearched, the result showed that cationic photoinitiator was sensitized by freeradical photoinitiator. Properties of UV-curing films were studied by water absorptiontest, FTIR, TGA and SEM, the results showed that mechanical property, thermalstability and solvent resistance property of hybrid films were better than those of freeradical films because of the formation of interpenetrating polymer network (IPN)during the curing process of hybrid system, tensile strength of hybrid film was10.34MPa, elongation at break was10.13%, impact strength was15kg·cm, adhesion gradewas1, flexibility was less than3mm, double acetone rubs was200. Finally, nano-SiO2was surface modified by silane coupler (3-methacryloxypro-pyl-trimethoxysilane, KH-570) and added into oxetane/acrylate hybrid system toprepare hybrid coating. According to the SEM observation, modified nano-SiO2waswell dispersed in the resin. The effects of the dosage of modified nano-SiO2onmechanical properties were investigated. The results showed that the addition ofmodified nano-SiO2could improve tensile property, flexibility, pencil hardness andimpact property of UV-curing films.