This study develops a kind of new modified unsaturated polyester with excellent properties of air dryness,corrosion resistance and low styrene volatility.The general resin has some imperfection such as high styrene volatility, little corrosion resistance, poor air dryness and flaw easily appears.Unsaturated polyester resin modified by dicyclopentadiene(DCPD)has same curing time but lower temperature and higher toughness compared to that of general resins. Due to DCPD modified unsaturated polyester has good compatibility with styrene so that amount of styrene is reduced, viscosity of modified resin changes little.
The new process and properties of dicyclopentadiene(DCPD) modified unsaturated polyester resin was investigated using DCPD in commercial quality which content was blow 80 percent as raw material and by catalyst hydrolysis addition method. The effect of different factors was investigated and the main process conditions were obtained: addition temperature120~140℃,esterify temperature:160~175℃,n(maleic anhydride):n(phthalic anhydride)=3~4:1(mol:mol),n(DCPD):n(maleic anhydride) =0.6~0.8:1(mol:mol),the amount of catalyst is 0.1~0.2%.The yield of resin reached 93.5~94.8%.