高固低黏长效防护涂料的制备及其防腐性能研究OA

To effectively solve the problems of poor interfacial compatibility and insufficient interlayer adhesion easily occurring at the construction lap joints of different coating varieties,a novel environmentally friendly high-solid long-term protective coating was developed based on epoxy resin system in this study.By optimizing the molecular structure of the resin matrix and the ratio of curing agent,the VOC content of the coating was reduced to 213 g/L,and the interfacial bonding performance of the coating was significantly improved.Its adhesion strength with epoxy mica intermediate paint and polyurethane topcoat is above 6 MPa,and the adhesion with antifouling paint is more than 3 MPa.Systematic laboratory tests were carried out in accordance with GB/T 1771-2007,no blistering or peeling was observed on the sample surface after 5000 h of continuous salt spray test.The cathodic disbonding test lasted for 6 months,and the measured distance from the artificial hole to the disbonded area was only 7.2 mm,meeting the protection life requirement of 13～15 years.After 180 days of cyclic test under simulated ballast tank wave impact environment,the coating remained intact and dense.In particular,no signs of permeation corrosion were detected in the coating system after continuous exposure in a simulated condensation cabin environment at 40 ℃ for 180 days.The experimental results show that the coating system realizes effective interfacial fusion between different coatings,and possesses excellent mechanical properties and long-term protection performance.It provides an innovative solution for the supporting application of protective coatings under complex working conditions.