Brenner Markus, Weichold Oliver
Institute of Building Materials Research, RWTH Aachen University, Schinkelstraße 3, Aachen 52062, Germany.
ACS Omega. 2020 Dec 8;5(50):32227-32233. doi: 10.1021/acsomega.0c03819. eCollection 2020 Dec 22.
The increasing demand for sustainable building materials requires alternative flame retarders, which have superior sustainability to those previously used. In this respect, we present our initial results with protein hydrolysates made from poultry-feather waste for the preparation of flame-retardant fiberboards. Impregnated wood fibers show a significantly decreased decomposition rate in the region between 300 and 450 °C, as measured by thermogravimetric analysis. Final combustion of the impregnated fibers is shifted up by 50 °C to the interval 450-500 °C and occurs stepwise rather than instantaneously as for untreated wood. At a total protein content of approx. 10 wt %, plates produced in the "wet" process are self-extinguishing and show very little subsequent smouldering. In three-point bending tests, these fiberboard prototypes were able to withstand stresses of up to 15 N/mm, the threshold required by DIN EN 622 for commercial, formaldehyde-bound MBH fiberboards. This indicates that the upcycled protein hydrolysates not only have an impressive flame-retarding effect but also can be used as a fully sustainable binder for a new generation of ecological fiberboards. As these boards are based solely on natural materials, they can be shredded and composted at the end of their life cycle.
对可持续建筑材料日益增长的需求需要替代阻燃剂，这些阻燃剂要比以前使用的具有更高的可持续性。在这方面，我们展示了用家禽羽毛废料制成的蛋白质水解物制备阻燃纤维板的初步成果。通过热重分析测量，浸渍过的木纤维在300至450°C之间的区域分解速率显著降低。浸渍纤维的最终燃烧温度提高了50°C，移至450 - 500°C区间，并且是逐步燃烧，而不像未处理的木材那样瞬间燃烧。在总蛋白质含量约为10 wt%时，“湿法”生产的板材具有自熄性，且后续阴燃很少。在三点弯曲试验中，这些纤维板原型能够承受高达15 N/mm的应力，这是DIN EN 622对商业用甲醛结合型MBH纤维板要求的阈值。这表明升级回收的蛋白质水解物不仅具有令人印象深刻的阻燃效果，还可用作新一代生态纤维板的完全可持续的粘合剂。由于这些板材仅基于天然材料，它们在生命周期结束时可以切碎并制成堆肥。
