| 超声波与纳米TiO_2改性脲醛树脂的研究 |
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| 引用本文： | 夏松华,李黎,李建章. 超声波与纳米TiO_2改性脲醛树脂的研究[J]. 北京林业大学学报, 2009, 31(4) |
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| 作者姓名： | 夏松华 李黎 李建章 |
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| 作者单位： | 北京林业大学材料科学与技术学院 |
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| 基金项目： | 国家林业局引进国际先进农业科学技术计划(948计划)，北京林业大学研究生自选课题 |
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| 摘 要： | 为了降低脲醛树脂的游离甲醛含量及其胶接制品的甲醛释放量,采用超声波技术,在脲醛树脂合成的过程中加入纳米TiO2对脲醛树脂进行改性。通过改变超声频率和纳米TiO2的添加量考察了其对脲醛树脂的黏度、固化时间、游离甲醛含量及胶合板的甲醛释放量和胶合强度的影响。结果表明:超声频率和纳米TiO2添加量对脲醛树脂甲醛释放量和胶合强度影响显著。当超声频率为28 kHz、纳米TiO2的添加量为0.05%时,树脂的游离甲醛含量降低了77.8%,胶合板的胶合强度提高了155%,甲醛释放量降低了68.3%。13C-核磁共振分析显示,在超声波的作用下,纳米TiO2改性脲醛树脂中有Uron-CH2-Uron结构存在。
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| 关 键 词： | 脲醛树脂 超声波 纳米TiO2 游离甲醛含量 胶合强度 |
Urea-formaldehyde resin modified by nano-TiO_2 under ultrasonic treatment |
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| XIA Song-hua,LI Li,LI Jian-zhang. Urea-formaldehyde resin modified by nano-TiO_2 under ultrasonic treatment[J]. Journal of Beijing Forestry University, 2009, 31(4) |
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| Authors: | XIA Song-hua LI Li LI Jian-zhang |
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| Affiliation: | XIA Song-hua,LI Li,LI Jian-zhang.College of Materials Science , Technology,Beijing Forestry University,100083,P.R.China. |
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| Abstract: | In order to decrease free formaldehyde of urea-formaldehyde(UF) resin and therefore to lower the formaldehyde emission level of its products,UF resin was modified by adding nano-TiO_2 and applying ultrasonic dispersing technology.Effects of ultrasonic frequency and addition amount of nano-TiO_2 on viscosity,curing rate,free formaldehyde content of UF resin,formaldehyde emission level and bond strength of plywood with this kind of resin were evaluated.The results showed that viscosity and curing rate were af... |
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| Keywords: | urea-formaldehyde ultrasonic treatment nano-TiO_2 free formaldehyde content bond strength |
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