The styrene-acrylic emulsion used to prepare waterborne damping coatings needs to further increase the damping factor and broaden the effective damping temperature range.In order to improve the damping per-formance of styrene-acrylic emulsion,oleic acid(OA)modified nano-Fe3O4(OA-Fe3O4)was used as the coated filler to prepare Fe3O4/poly(styrene acrylate)(Fe3O4/P(St-2-EHA))composite damping emulsion via miniemulsion poly-merization.The composite emulsion and its latex film were characterized by FTIR,XRD,TEM,SEM,DLS,TG and DMA.The effects of copolymer composition,surface properties and content of nano-Fe3O4 on the structure and per-formance of the emulsion and latex film were studied.The results show that the direct agglomeration of OA-Fe3O4 nanoparticles is weakened,and its dispersion in the composite emulsion is significantly improved.When the mass ratio of monomer St to 2-EHA is 5∶5,the obtained P(St-2-EHA)latex film has the highest loss factor(tanδ)peak(1.926).When the mass ratio of OA-Fe3O4 to the total mass of St and 2-EHA is 10wt%,the obtained Fe3O4/P(St-2-EHA)composite latex film has the best performance.Its tanδ peak value and effective damping temperature range width are 2.066 and 59.2℃,which are better than pure P(St-2-EHA)latex film and composite latex film prepared by blending method.Its water absorption rate is 3.4%and 10.4%lower than the latter two respectively.And the initial thermal decomposition temperature is higher,with the thermal stability improved.
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