(2)对脲醛进行改性，为了使的交联程度，脆性下降，挠性增加，可以加入热塑性来改性，如在缩聚时加入聚醇形成聚醉缩甲醛来改性脉醛，或与热塑性(如聚醋酸)混合使用，这样?。
改善胶层老化性的方法有:(1)从工艺方面要求被胶接木材表面平整光滑，尽坛凸凹不平，以免胶液分布不均而形成过厚的胶层，在表里收缩不均匀的情况下产生开裂。如用20%^-30%的聚醋酸酪乳液与脉醛共混后用于人造板表面装饰的徽薄木湿贴，即可防止透胶，又可以实现快速胶贴。
另外在中加入适量的醉类物质，使醚化，可以的柔韧性。(3)在中加入各种填料，如豆粉、小麦粉、木粉、石青粉等，这是改善脲醛的老化性，防止胶层由于应力作用而引起的龟裂的简便而又行之有效的方法。
(4)适当使用固化剂，固化剂的酸性愈强，虽然可以明显地缩短的固化时间，但也相应地胶压后的迅速老化，因此选用适当的固化剂，可以这种现象，延长制品的使用寿命。一般以抓化锌或抓化铁等作固化剂，效果较好。
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