Zhao Zhongyuan, Sun Shijing, Wu Di, Zhang Min, Huang Caoxing, Umemura Kenji, Yong Qiang
College of Furnishings and Industrial Design, Nanjing Forestry University, Nanjing 210037, China.
College of Material Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2019 Nov 20;11(12):1909. doi: 10.3390/polym11121909.
The development of eco-friendly adhesives for wood composite products has been a major topic in the field of wood science and product engineering. Although the research on tannin-based and soybean protein-based adhesives has already reached, or at least nears, industrial implementation, we also face a variety of remaining challenges with regards to the push for sustainable adhesives. First, petroleum-derived substances remain a pre-requisite for utilization of said adhesive systems, and also the viscosity of these novel adhesives continues to limit its ability to serve as a drop-in substitute. Within this study, we focus upon the development of an eco-friendly plywood adhesive that does not require any addition of petroleum derived reagents, and the resultant liquid adhesive has both high solid contents as well as a manageably low viscosity at processing temperatures. Specifically, a system based on sucrose and ammonium dihydrogen phosphate (ADP) was synthesized into an adhesive with ~80% solid content and with viscosities ranging from 480-1270 mPa·s. The bonding performance of all adhesive-bound veneer specimens satisfied GB/T 9846-2015 standard at 170 °C hot pressing temperature. To better explain the system's efficiency, in-depth chemical analysis was performed in an effort to understand the chemical makeup of the cured adhesives as well as the components over the time course of curing. Several new structures involving the fixation of nitrogen speak to a novel adhesive molecular network. This research provides a possibility of synthesizing an eco-friendly wood adhesive with a high solid content and a low viscosity by renewable materials, and this novel adhesive system has the potential to be widely utilized in the wood industry.
开发用于木质复合材料产品的环保型胶粘剂一直是木材科学与产品工程领域的一个主要课题。尽管对单宁基和大豆蛋白基胶粘剂的研究已经达到，或者至少接近工业应用阶段，但在推动可持续胶粘剂发展方面，我们仍面临各种挑战。首先，石油衍生物质仍然是使用上述胶粘剂体系的先决条件，而且这些新型胶粘剂的粘度继续限制其作为直接替代品的能力。在本研究中，我们专注于开发一种不需要添加任何石油衍生试剂的环保型胶合板胶粘剂，所得液体胶粘剂在加工温度下具有高固含量和易于控制的低粘度。具体而言，一种基于蔗糖和磷酸二氢铵（ADP）的体系被合成成一种固含量约为80%、粘度范围为480 - 1270 mPa·s的胶粘剂。所有胶粘剂粘结单板试件在170°C热压温度下的粘结性能均满足GB/T 9846 - 2015标准。为了更好地解释该体系的效率，进行了深入的化学分析，以了解固化胶粘剂的化学组成以及固化过程中各组分随时间的变化。几个涉及氮固定的新结构表明存在一种新型胶粘剂分子网络。本研究提供了一种利用可再生材料合成高固含量、低粘度环保型木材胶粘剂的可能性，这种新型胶粘剂体系有潜力在木材工业中得到广泛应用。
