
不饱和聚酯树脂
不饱和聚酯树脂(Unsaturated Polyester Resin,简称UPR)是一种常用的热固性树脂,由不饱和二元酸与二元醇或饱和二元酸与不饱和二元醇通过缩聚反应制得。这种树脂具有酯键和不饱和双键,是一种线型高分子化合物。其独特的化学结构使其能够在交联单体(如苯乙烯)的作用下,通过自由基共聚合反应,从不溶、可熔状态转变为不溶、不熔的三维立体网络结构。不饱和聚酯树脂具有优异的工艺性能,能在室温下固化,常压下成型,适合大型和现场制造玻璃钢制品。此外,它还具有良好的力学性能、耐腐蚀性、电性能和阻燃性,广泛应用于建筑、化工、交通、航空航天等领域。
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