The dimethylol propi high branched polyether polyol resin was synthesized based on polyether polyol as core and onic acid ( DMPA ) as extender by one-step process, its structure was characterized by Fourier transform infrared spectroscopy ( FTIR ), its molecular weight distribution was determined by gel permeation chromatography ( GPC ). The results showed that the branched polyether polyol resin had narrow molecular weight distribution and its polydispersity index( PDI )was 1.12. The research found that the solid content in coatings wa...