The relative density of the unsaturated polyester resin is about 1.11 to 1.20, and the volume shrinkage ratio is large at the time of curing. Some physical properties of the cured resin are as follows:
(1) Heat resistance. Most of the unsaturated polyester resins have a heat distortion temperature of 50 to 60 ° C, and some resins with good heat resistance can reach 120 ° C. The red thermal expansion coefficient α1 is (130 to 150) × 10 -6 ° C.
(2) Mechanical properties. The unsaturated polyester resin has high strength such as stretching, bending, and compression.
(3) Chemical resistance. Unsaturated polyester resin has good performance against water, dilute acid and dilute alkali, and has poor resistance to organic solvents. At the same time, the chemical resistance of the resin can vary greatly depending on its chemical structure and geometrical switch.
(4) Dielectric properties. The dielectric properties of the unsaturated polyacid resin are good.
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