Study On Synthesis Of High-performance Unsaturated Polyester Resin

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 curing 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, dynamic viscosity of modified resin changes little. When n(DCPD):n(MA) =0.15(mole rate), corrosion resistance will have a wonderful performance.Mechanics property of DCPD modified unsaturated polyester resin is close to the general ones. ZSL modified polyester has outstanding mechanics property and low-cost but its poor activity and high viscosity. In order to develop a resin fitting to glue for construction, ZSL and DCPD were introduced into resin simultaneity. The modified resin has excellent property of mechanics, curing time, dynamic viscosity, air dry and corrosion resistance.The S-type unsaturated polyester which is to be gained by the reaction among (a) dicyclopentadiene, (b) α , β -ethylenically unsaturated dicarboxylic acid or its anhydride, (c)a polyhydric alcohol,and (d)a tetrahydrophthalic acid or its anhydride, along with (e) ZSL ,if desired, in accordance with the conventionally known method under210℃ reacting 6.5 h. The amount of dicyclopentadiene is in the range of about 0.1 to 0.2 mole against the MA component.and the amount of ZSL is in the range of about 0.05 to 0.15 mole against of MA component. The resin is brown and its dynamic viscosity is 3.9Pas. The results show: when polyester: evocator: accelerant= 100:2:0.8 (weight rate) , the curing time needs about 40min and the curing temperature can reach 120℃; when resin: filler=80:200 (weight rate) , the compression strength can reach 124MPa and tensile strength can reach 58MPa,...