水性环氧防腐涂料研究

Waterborne Epoxy Anticorrosive Paint

目的研制具有优异防腐性能的水性环氧类防腐蚀涂料。方法采用水性环氧树脂乳液与水性环氧固化剂聚酰胺作为成膜树脂,异丙醇、丙二醇甲醚作为助成膜剂,湿法绢云母、重晶石粉、滑石粉作为填料,防锈颜料体系采用氧化铁红、三聚磷酸铝、磷酸锌,并在涂料体系中添加防闪锈剂、去离子水、分散剂、消泡剂、防沉剂,经过高速分散、研磨制成水性环氧防腐涂料。通过物理机械性能试验,耐酸、碱、盐溶液浸泡和耐中性盐雾试验,测试涂层的综合性能。结果涂层的附着力、柔韧性和耐冲击性能分别达到1级、1 mm和50 cm。涂层的耐酸性(5%H_2SO_4,168 h)、耐碱性(5%NaOH,168 h)、耐盐水性(3%NaCl,30 d)和耐盐雾性能(按GB/T 1771—2007,1000 h)良好,各试样完成后,涂层完好。结论成膜树脂采用环氧当量为500±50的水性环氧树脂乳液与聚酰胺类水性环氧固化剂,控制环氧基与活泼氢当量配比为1:1,颜料体积浓度为30%,并使用三聚磷酸铝、磷酸锌与氧化铁红复配作为防锈颜料,所制备的涂层有优良的物理机械性能和防腐性能。

The work aims to develop a kind of waterborne epoxy anticorrosive paint of excellent corrosion resistance. With waterborne epoxy resin emulsion and waterborne polyamide curing agent as film-forming resins, isopropanol and propylene glycol monomethyl ether（PGME） as coalescing agents, sericite, barite powder and talc powder as fillers, and aluminium triphosphate, zinc phosphate and iron oxide red as anticorrosive pigments, the waterborne epoxy anticorrosive paint was prepared based upon high speed dispersion and grinding of the paint system mixed with flash-rust inhibitor, deionized water, dispersant, antifoaming agent and anti-settling agent. Overall performance of the coating was tested by performing physical and mechanical tests, anti-acid, alkaline and saline solution immersion soaking and anti-neutral salt spray tests. Adhesion, flexibility and impact resistance of the coating reached level one, 1 mm and 50 cm, respectively. The intact coating featured in excellent acid resistance（5% H2 SO4, 168 h）, alkali resistance（5% Na OH, 168 h）, salt water resistance（3% Na Cl, 30 d） and salt fog resistance（GB/T 1771—2007, 1000 h）. When the paint is prepared with waterborne epoxy resin emulsion with an epoxy equivalent of 500±50 and waterborne polyamide curing agent as film-forming resins, the ratio of epoxy group/active hydrogen equivalent is 1：1, the pigment volume concentration is 30%, and aluminium triphosphate, zinc phosphate and iron oxide red mixture are used as anticorrosive pigments, and the coating exhibits good physical and mechanical properties as well as corrosion resistance.