SiO_2改性胶合板用脲醛树脂的研究

Study on urea-formaldehyde resin modified by SiO_2 for plywood

研究利用SiO2对胶合板用脲醛树脂进行改性,考察了摩尔比、二氧化硅粒径和二氧化硅用量对胶合板胶合强度和游离甲醛的影响。结果表明:用机械共混方式将经硅烷偶联剂KH-550处理的微米级(8μm) SiO2导入摩尔比F／U=1.1:1的脲醛树脂中,当导入量为0．5％时,压制的杨木胶合板胶合强度显著提高,达到国家GB 9846-2004Ⅱ类胶合板标准要求,甲醛释放量达到国家El级标准。

This paper introduced how SiO2/UF mixture affected the bonding strength and formaldehyde emission of plywood. Based on the orthogonal experiment design,the size of SiO2 ind its added amount were studied when UF modified by SiO2. The results indicated the mixture of UF resin at the molar ratio of F/U was 1.1： 1 and SiO2（8um） treated by silan coupling agent KH550,the level of 0.5%,the bonding strength of poplar plywood was improved significantly, it met the demand of national standard of grade Ⅱ , and formaldehyde emission also met grade E1.