以松香和甲醛为原料,在催化剂作用下发生Prins加成反应,合成了甲醛改性松香;再与环氧氯丙烷发生开环反应、闭环反应,合成了甲醛改性松香环氧树脂.用红外光谱(FT-IR)、核磁共振谱(~1H-NMR)和凝胶渗透色谱(GPC)等对产物进行了表征.在适宜的条件下,合成的环氧树脂的环氧值为0.37 mol/(100 g).采用固化剂4,4'-二氨基二苯砜(DDS)和甲基六氢苯酐(MHHPA)对产物进行了固化.DSC和TG表明,甲醛改性松香环氧树脂/DDS固化物具有较好的热性能.
Formaldehyde modified rosin was produced from rosin and formaldehyde, and then formaldehyde modified rosin epoxy resin was synthesized by ring-open and ring-closing reaction of formaldehyde modified rosin and epichlorohydrin. The product which was synthesized under suitable conditions had following property:epoxy value 0.37 mol/(100 g). The product was characterized by Fourier transform infrared spectrum(FT-IR), ~1H nuclear magnetic resonance spectrum(~1H-NMR)and gel permeation in chromatography(GPC). Formaldehyde modified rosin epoxy resin was cured by 4,4'-diaminodiphenylsulfone(DDS)and methylhexahydrophthalic anhydride(MHHPA)respectively. The test proved that the curing product of formaldehyde modified rosin epoxy resin has good heat properties.
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