Adhikari Birendra B, Appadu Pooran, Kislitsin Vadim, Chae Michael, Choi Phillip, Bressler David C
Department of Agricultural, Food and Nutritional Science, Faculty of Agricultural, Life and Environmental Sciences, University of Alberta, Edmonton, AB T6G 2P5, Canada.
Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Polymers (Basel). 2016 Aug 8;8(8):285. doi: 10.3390/polym8080285.
The current production of wood composites relies mostly on formaldehyde-based adhesives such as urea formaldehyde (UF) and phenol formaldehyde (PF) resins. As these resins are produced from non-renewable resources, and there are some ongoing issues with possible health hazard due to formaldehyde emission from such products, the purpose of this research was to develop a formaldehyde-free plywood adhesive utilizing waste protein as a renewable feedstock. The feedstock for this work was specified risk material (SRM), which is currently being disposed of either by incineration or by landfilling. In this report, we describe a technology for utilization of SRM for the development of an environmentally friendly plywood adhesive. SRM was thermally hydrolyzed using a Canadian government-approved protocol, and the peptides were recovered from the hydrolyzate. The recovered peptides were chemically crosslinked with polyamidoamine-epichlorohydrin (PAE) resin to develop an adhesive system for bonding of plywood specimens. The effects of crosslinking time, peptides/crosslinking agent ratio, and temperature of hot pressing of plywood specimens on the strength of formulated adhesives were investigated. Formulations containing as much as 78% (/ peptides met the ASTM (American Society for Testing and Materials) specifications of minimum dry and soaked shear strength requirement for UF resin type adhesives. Under the optimum conditions tested, the peptides⁻PAE resin-based formulations resulted in plywood specimens having comparable dry as well as soaked shear strength to that of commercial PF resin.
目前木质复合材料的生产主要依赖于基于甲醛的胶粘剂，如脲醛（UF）和酚醛（PF）树脂。由于这些树脂由不可再生资源生产，且此类产品释放的甲醛可能存在健康危害等一些现存问题，本研究的目的是开发一种以废弃蛋白质作为可再生原料的无甲醛胶合板胶粘剂。这项工作的原料是指定风险物质（SRM），目前其处置方式要么是焚烧，要么是填埋。在本报告中，我们描述了一种利用SRM开发环保胶合板胶粘剂的技术。采用加拿大政府批准的方案对SRM进行热水解，并从水解产物中回收肽。将回收的肽与聚酰胺多胺 - 环氧氯丙烷（PAE）树脂进行化学交联，以开发用于胶合板试件粘结的胶粘剂体系。研究了交联时间、肽/交联剂比例以及胶合板试件热压温度对配制胶粘剂强度的影响。含高达78%肽的配方符合美国材料与试验协会（ASTM）对UF树脂型胶粘剂的最低干剪切强度和湿剪切强度要求的规范。在测试的最佳条件下，基于肽 - PAE树脂的配方所制成的胶合板试件的干剪切强度和湿剪切强度与市售PF树脂相当。
