單體種類及光引發劑添加量對環氧壓克力紫外線硬化型塗料性質之影響

Effects of Monomers and Dosages of Photoinitiator on the Properties of Epoxy Acrylate UV-curing Coatings

本研究係探討單體種類及光引發劑添加量，對以環氧壓克力樹脂為基質紫外線硬化型（UV）塗料性質之影響；UV塗料由環氧壓克力樹脂寡聚合體、單體及光引發劑所組成，係將環氧壓克力樹脂∕單體＝80／20（重量比），光引發劑添加量分別為全樹脂重之1、2、3及5%，調配成各種自由基硬化型UV塗料。其中，單體的種類包括單官能性之甲基丙烯酸甲酯（MMA）、雙官能性之二丙烯酸1, 6-己二醇酯（HDDA）與二丙烯酸三丙二醇酯（TPGDA）及三官能性之三甲醇基（三甲醇基丙烷三丙烯酸酯）丙烷三丙烯酸酯（TMPTA）與三丙烯酸異戊四醇酯（PETA）等5種壓克力系單體，光引發劑則採用光裂解型之Benzil dimethyl ketal（Irgacure 651）。試驗結果發現，各種配方之UV塗料以含雙官能性TPGDA單體及3%光引發劑添加量者，可獲得最為均衡之塗料與塗膜性質，但塗膜附著性仍待進一步改善，才適合用於木材塗裝。 The objectives of this study were to investigate the effect of monomers and dosages ofphotoinitiator on the properties of UV-curing coatings which prepared from epoxy acrylate resinoligomer, monomer and photoinitiator. The formulation of each free radical polymerization UV-curingcoating was epoxy acrylate resin /monomer by the weight ratio of 80/20, and the dosage of photoinitiatorbased on the weight of total resins including 1, 2, 3, and 5% was added, respectively. Five kinds ofacrylate monomers such as mono-functionality (methyl methacrylate, MMA), di-functionality (1,6-hexanediol diacrylate, HDDA; tripropylene glycol diacrylate, TPGDA), and tri-functionality (trimethylolpropane triacrylate, TMPTA; pentaerythritol triacrylate, PETA) monomers and one ofphoto-cleavage type photoinitiators benzil dimethyl ketal (Irgacure 651) were used. The results showedthat, among all the UV-curing coatings, the one containing TPGDA monomer and 3% dosage ofphotoinitiator had excellent performances and a balance effect on the properties of coatings and films.However, the poor adhesion of this UV coating must further be improved for wood finishing.

The objectives of this study were to investigate the effect of monomers and dosages ofphotoinitiator on the properties of UV-curing coatings which prepared from epoxy acrylate resinoligomer, monomer and photoinitiator. The formulation of each free radical polymerization UV-curingcoating was epoxy acrylate resin /monomer by the weight ratio of 80/20, and the dosage of photoinitiatorbased on the weight of total resins including 1, 2, 3, and 5% was added, respectively. Five kinds ofacrylate monomers such as mono-functionality (methyl methacrylate, MMA), di-functionality (1,6-hexanediol diacrylate, HDDA; tripropylene glycol diacrylate, TPGDA), and tri-functionality (trimethylolpropane triacrylate, TMPTA; pentaerythritol triacrylate, PETA) monomers and one ofphoto-cleavage type photoinitiators benzil dimethyl ketal (Irgacure 651) were used. The results showedthat, among all the UV-curing coatings, the one containing TPGDA monomer and 3% dosage ofphotoinitiator had excellent performances and a balance effect on the properties of coatings and films.However, the poor adhesion of this UV coating must further be improved for wood finishing.