Preparation and Comprehensive Protective Performance Study of Thickened Magnolol Epoxy Resin Coatings
The biomass raw material magnolol with a biphenyl structure was used to synthesize bio-based epoxy resin,and flexible polyetheram-ine curing agents(D230,D400,D2000 and T403)were used to cure the bio-based epoxy anti-erosion coating.The effects of poly etheramine mo-lecular weight and functionality on the mechanical properties,corrosion resistance and anti-erosion protection performance of magnolol epoxy resin were explored,and the anti-erosion mechanism of magnolol epoxy coatings was proposed.Results showed that the magnolol epoxy coating cured with D230 maintained a high impedance value(1.25×1011 Ω·cm2)after 15 d of immersion in 3.5％(mass fraction)NaCl solution.The coating cured with T403 possessed a high tensile strength(26.59 MPa),low friction coefficient(0.373)and wear rate[0.018 3 mm3/(N·m)],while the magnolol epoxy coating cured with D2000 exhibited lower mass loss(244.74 mg)and volume loss(157 mm3)in the erosion test.Under the coupled erosion of solid/liquid/gas three-phase flow,the longer flexible segment of D2000 endowed the magnolol epoxy coating with better elas-ticity and flexibility,and therefore reduced the impact of the erosion medium,thus showing excellent anti-erosion performance.
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