纳米二氧化硅/脲醛树脂性能的研究

探讨纳米SiO2 表面处理、加入方式、用量对纳米SiO2 脲醛树脂性能的影响。结果表明 :采用KH - 5 5 0硅烷偶联剂处理纳米SiO2 表面 ,用间歇式超声波震荡法将其加入脲醛树脂中 ,能有效改善树脂性能。当纳米SiO2 用量 <1 5 %时 ,用量越大 ,树脂的胶合强度越高 ,游离甲醛含量越低 ,粘度越大 ,固化时间不变。用纳米SiO2 (用量1% ) 脲醛树脂 (F U摩尔比 1 2 )压制胶合板、刨花板、中密度纤维板 ,板的各项性能指标都超过国家标准要求 ,甲醛释放量达到E1 级水平。同时 ,通过红外光谱和X射线光电子能谱初步探索了纳米SiO2 对脲醛树脂的增强机制

Study on the Property of Nano-SiO2/Urea Formaldehyde Resin

The effects of nano-SiO 2 coupling agent, dispersing methods and its content on the properties of the urea formaldehyde (UF) resin were discussed. The test results indicated that when nano-SiO 2, incorporated with KH-550 silane coupling agent, and was put into UF resin by discontinuous ultrasonic vibration, it had the best results. When the content of nano-SiO 2 was below 1.5%,the content of free formaldehyde decreased,viscosity and bonding strength of resin increased with the nano_SiO-2 added,which would not affect the curing time. The performance index of plywood, particleboard and medium density fiberboard(MDF) , pressed by nano-SiO 2(1%)/ UF resin (F/U mole ratio=1.2), were above the demand of national standard and their dissociate formaldehyde release reached E-1 grade. Furthermore, strengthening mechanism for the effects of nano-SiO 2 on UF resin were analyzed by means of infrared (IR) spectrum analysis and X-ray photoelectronic spectrum (XPS).