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以溶液聚合工艺制备了数均分子量在20000左右、羟基值为40～48mgKOH/g的丙烯酸树脂,将该树脂与固化剂N-75按适宜的比例混合为底涂层,淋涂于800mm×400mm的洁净有机玻璃(PMMA)表面,在真空镀膜机中依次沉积TiO2膜和Au膜,获得了PMMA/底涂/TiO2/Au/TiO2膜。研究了不同配方的丙烯酸树脂合成工艺和混合溶剂的选择及配比对PMMA/底涂/TiO2/Au/TiO2膜性能的影响,讨论了“形变”的原因。研究发现,当乙酸丁酯和丙二醇甲醚醋酸酯以1∶1的质量比为混合溶剂,树脂和混合溶剂的质量比为1∶3时,所得涂膜具有良好的附着力。以Tego270为助剂,其质量分数为0.2%时能有效减少薄膜的“形变”缺陷。
A solution polymerization process was prepared with a number average molecular weight of about 20000, a hydroxyl value of 40 ~ 48mgKOH / g of acrylic resin, the resin and the curing agent N-75 mixed at an appropriate ratio as the basecoat, shower coating 800mm × 400mm (PMMA). In the vacuum coater, TiO2 film and Au film were sequentially deposited to obtain PMMA / undercoat / TiO2 / Au / TiO2 film. The effects of different acrylic resin synthesis process and solvent selection on the properties of PMMA / primer / TiO2 / Au / TiO2 film were studied. The reason of “deformation” was discussed. The study found that when the butyl acetate and propylene glycol methyl ether acetate mass ratio of 1: 1 as a mixed solvent, resin and mixed solvent mass ratio of 1: 3, the resulting coating film has good adhesion. With Tego270 as additive, its mass fraction of 0.2% can effectively reduce the film “deformation ” defects.