Foundry polyurethane binder comprises component Ⅰ, a polyhydroxy component whose main component is benzylic ether phenolic resin, component Ⅱ, a polyisocyanate, and a catalyst.
铸造用的聚氨酯粘合剂主
有两组
构
，组Ⅰ为多羟基化合物，如苯醚型酚醛树脂为主；
Foundry polyurethane binder comprises component Ⅰ, a polyhydroxy component whose main component is benzylic ether phenolic resin, component Ⅱ, a polyisocyanate, and a catalyst.
铸造用的聚氨酯粘合剂主有两组构，组Ⅰ为多羟基化合物，如苯醚型酚醛树脂为主；
A water soluble polyhydroxy derivative of1,4| diazine has been isolated from Panax pseudoginseng var notoginseng for the first time.
溶性分中首次分离得到一个多羟基吡嗪衍生物。
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