Fe^(2+)/H_2O_2催化氧化脲醛树脂胶中游离甲醛及其对性能的影响

Removing Free Formaldehyde From Urea-Formaldehyde Resin Adhesive By Means of Fe^(2+)/H_2O_2 Catalytic Oxidation and Its Effects on Performance of the Adhesive

采用Fe2+/H2O2催化氧化法消除脲醛树脂胶中的游离甲醛,其最佳条件为室温25～40℃,H2O2与甲醛摩尔比约为1∶1,Fe2+为H2O2摩尔量的1/70～1/60,反应时间为40min。在此条件下,脲醛树脂胶中残余甲醛含量基本达到GB/T14732―2006标准。该方法不影响脲醛树脂胶的胶合强度,但影响脲醛树脂胶的贮存稳定性,适合在脲醛树脂胶使用前3~5天内使用。

The optimum conditions for removing free formaldehyde from urea formaldehyde resin adhesive by means of Fe^2＋/H2O2 catalytic oxidation were as follows： room temperature at 25℃-40℃, molar ratio of H2O2 to formaldehyde about 1：1, molar weight of Fe^2＋ accounting for 1/70-1/60 of H2O2, reaction time for 40 min. Under the above-mentioned conditions, free formaldehyde residue in urea-formaldehyde resin adhesive basically reached GB Standard/T 14732-2006. This method would not affect scuffing strength of the adhesive, but did influence its storage stability therefore it suited to be used 3-5 days before application of the adhesive.