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甲醛释放和耐水性是脲醛树脂应用中存在的主要问题。试验采用SiO2对脲醛树脂进行改性,得出的最佳合成工艺为F／U=1.15,在树脂合成后于室温下采用机械共混方式导入经硅烷偶联剂KH550处理过的微米SiO2,用量为UF树脂总量的1．5％。用这种改性树脂压制的中密度纤维板(MDF)性能可达到国家标准优等品的要求,游离甲醛释放量也可达到国标GB 18580-2001《室内装饰装修材料-人造板及其制品中甲醛释放量》中E1级要求。
Formaldehyde release and water resistance are the main problems in urea-formaldehyde resin applications. The experiment uses SiO2 to modify the urea-formaldehyde resin, the best synthesis process is F / U = 1.15. After the resin is synthesized, it is introduced into the micro-SiO2 treated with silane coupling agent KH550 by mechanical blending at room temperature. 1.5% of the total amount of UF resin. The MDF properties of this modified resin can be up to the requirements of the national standard superior products, free formaldehyde emissions can also reach the national standard GB 18580-2001 “interior decoration materials - formaldehyde emission of wood-based panels and their products Quantity ”in the E1 level requirements.