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以不同工艺制备了三种含尤戎结构的脲醛树脂(Uron树脂),通过其与普通脲醛树脂的混合制得多种混合脲醛树脂。研究了Uron树脂及其使用方法对降低脲醛树脂胶粘剂游离甲醛含量及胶接胶合板甲醛释放量的作用与效果。结果表明:1)三种不同摩尔比的Uron树脂对脲醛树脂游离甲醛含量及胶接胶合板甲醛释放量都有明显的降低作用,游离甲醛含量最多可降低43％,甲醛释放量最多可降低61％;2)Uron树脂的添加量在10％-20％时对胶合强度的提高有利,强度最大可提高29％;3)低摩尔比Uron树脂对脲醛树脂的改性效果优于高摩尔比Uron树脂。
Three kinds of urea-formaldehyde resins (Uron resin) with different structure were prepared by different processes. A variety of mixed urea-formaldehyde resins were prepared by mixing them with common urea-formaldehyde resin. The effect of Uron resin and its using method on reducing free formaldehyde content of urea formaldehyde resin adhesive and formaldehyde emission of adhesive plywood was studied. The results showed that: 1) Uron resin with three different molar ratios significantly reduced the free formaldehyde content of urea formaldehyde resin and the formaldehyde emission of adhesive plywood. Free formaldehyde content was reduced by 43% and formaldehyde emission by 61% ; 2) When Uron resin is added in an amount of 10% -20%, it is beneficial to improve the bonding strength and the maximum strength can be increased by 29%; 3) Uron resin has a better modification effect on urea resin than Uron resin .