【摘要】 本文着重从改善脲醛树脂的脆性,增加高分子链的柔顺性,降低吸湿性和含氮量的角度去探讨复合脲醛树脂的合成及其铸造工艺性能。更多还原

【Abstract】 The authors have studies synthesis and foundry technological propeties ofomplex urea-formaldehyde resin especially in view of reducing brittleness ofresin and improving flexibility of macromolecule chain reducing absorption andnitrogen content of resin.更多还原