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首页> 外文期刊>Pro Ligno >EVALUATION OF TWO ULTRASONIC METHODS FOR PREPARING UREA-FORMALDEHYDE ADHESIVES WITH NANO-SIO_2
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EVALUATION OF TWO ULTRASONIC METHODS FOR PREPARING UREA-FORMALDEHYDE ADHESIVES WITH NANO-SIO_2

机译：纳米SIO_2制备脲醛胶的两种超声方法的评价。

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This paper evaluates two methods for ultrasonic mixing of nano-SiO2 into urea-formaldehyde (UF) adhesives. Nano-silica (SiO2) was used in the form of 30% colloidal suspension, with the nanoparticles having a diameter of 7 nm. Its addition into the UF adhesive was 15%, based on the dry weight. The mixing of these components was performed with a probe-type ultrasonic homogenizer and with an ultrasonic bath, during 25 minutes of mixing time. The effects of each method were evaluated by SEM microscopy, and the results showed that the ultrasonic probe achieved much higher and almost complete homogenization of the UF / nano-SiO2 mixture, in contrast to the ultrasonic bath method. Therefore, the ultrasonic probe was subsequently used to test the influence of the mixing time on the homogenization level and on the curing kinetics of the UF adhesive with nano-SiO2. The homogenization level was not significantly altered when decreasing the mixing time from 25 to 5 minutes. For the same time range, the differential scanning calorimetry analysis also showed no significant influence of the mixing time on the curing behavior of the UF adhesive with nano-SiO2. The results of this research provide the basis for a more effective and efficient mixing procedure when using similar nanomaterials with UF adhesives, without significantly decreasing its performances.
机译：本文评估了两种将纳米SiO2超声混合到脲醛（UF）粘合剂中的方法。纳米二氧化硅（SiO2）以30％胶体悬浮液的形式使用，纳米粒子的直径为7 nm。基于干重，其添加到UF粘合剂中为15％。这些成分的混合是在25分钟的混合时间内用探针型超声波均化器和超声波浴进行的。通过SEM显微镜评价了每种方法的效果，结果表明，与超声浴法相比，超声探针可以实现更高的UF /纳米SiO2混合物的均质化。因此，超声探头随后用于测试混合时间对纳米SiO2 UF胶粘剂的均质化水平和固化动力学的影响。将混合时间从25分钟减少到5分钟时，均质化水平没有明显改变。在相同的时间范围内，差示扫描量热分析也没有显示混合时间对具有纳米SiO2的UF胶粘剂的固化行为没有显着影响。这项研究的结果为在使用类似的纳米材料和超滤粘合剂的同时，不显着降低其性能的情况下，提供一种更有效的混合程序的基础。

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