以聚己内酯、新戊二醇与顺丁烯二酸酐合成了聚酯树脂,然后与六亚甲基二异氰酸酯(HDI)反应以提高支化度,引入有机硅后再同丙烯酸单体反应制得丙烯酸改性聚酯树脂.以此丙烯酸改性聚酯树脂和适量的颜填料为甲组分、拜耳3390固化剂为乙组分,开发了适用于海洋气候的钢结构表面防护涂层.研究了顺丁烯二酸酐含量、丙烯酸改性聚酯树脂羟基含量、n(—NCO)∶n(—OH)值和聚合条件对面漆性能的影响.当顺丁烯二酸酐的用量为聚酯树脂的5％,自制的丙烯酸改性聚酯树脂羟基含量为4.5％±0.3％,n(—NCO)∶n(—OH)=1.1～1.4时,所制备的丙烯酸改性聚酯树脂面漆配以环氧富锌底漆及环氧云母氧化铁中涂漆得到的涂层体系能够满足海上平台钢结构的防护要求.%A polyester resin was synthesized with polycaprolactone, neopentyl glycol, and maleic anhydride, and then reacted with acrylic monomers after the improvement of branching degree with hexamethylene diisocyanate (HDI) and the introduction of organosilicon to form an acrylic-modified polyester resin. A steel structure surface protective coating used in marine environment was developed with the acrylic-modified polyester resin and proper amount of pigments and fillers as the first component and with Bayer 3390 curing agent as the second component. The effects of maleic anhydride content, hydroxyl content of acrylic-modified polyester resin, molar ratio of —NCO to —OH, and polymerization condition on the performance of topcoat were studied. The coating system obtained by the prepared acrylic-modified polyester resin combined with epoxy zinc-rich primer and micaceous iron oxide epoxyrnmid-coat can meet the protection requirement of steel structure of marine operation platform when the dosage of maleic anhydride is 5% of polyester resin, hydroxyl content of the acrylic-modified polyester resin 4.5% ± 0.3%, and molar ratio of-NCO to-OH 1.1-1.4.
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