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Mechanical and water-resistant properties of rice straw fiberboard bonded with chemically-modified soy protein adhesive

机译：化学改性大豆蛋白胶粘剂对稻草纤维板的力学和耐水性能

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摘要

In this work, rice straw and soy protein were used to make fiberboard which may replace wood fiberboard. Soy protein isolates (SPI) were modified by epoxidized oleic acid to improve the soy protein adhesive properties such as adhesion strength and water resistance. The effects of NaOH content, the addition of modified-SPI adhesives and fiberboard density on the mechanical and water-resistant properties of the rice straw fiberboards were investigated. FTIR and XRD results of modified SPI indicated the epoxidized oleic acid and soy protein reacted with each other. FTIR and SEM images of rice straw fibers showed that NaOH solution removed the wax layer through chemical etching. The results of investigating mechanical properties and water absorption illustrate that when the soy protein-based adhesives content and density and the hot pressing temperature and pressure of fiberboard are 12%, 0.8 g cm ~(?3) , 140 °C and 6 MPa, respectively, the panels have optimal mechanical and water-resistant performances. Moreover, the panels meet the requirements of chinese medium density fiberboard (MDF) Standard of GB/T 11718-2009. Since biological raw materials are recyclable and biomass, the fiberboard bonded with modified soy protein adhesive has no toxicity and is easily biodegradable. In addition, the rice straw burned to produce haze has been preferably utilized.
机译：在这项工作中，稻草和大豆蛋白被用来制造纤维板，可以代替木质纤维板。大豆分离蛋白（SPI）通过环氧化的油酸进行修饰，以改善大豆蛋白的粘合性能，如粘合强度和耐水性。研究了NaOH含量，改性SPI胶粘剂的添加和纤维板密度对稻草纤维板机械性能和耐水性能的影响。改进的SPI的FTIR和XRD结果表明，环氧化的油酸和大豆蛋白相互反应。稻草纤维的FTIR和SEM图像表明，NaOH溶液通过化学蚀刻去除了蜡层。对机械性能和吸水率的研究结果表明，当大豆蛋白基胶粘剂的含量和密度以及纤维板的热压温度和压力为12％，0.8 g cm〜（？3），140°C和6 MPa时，面板分别具有最佳的机械性能和防水性能。此外，这些面板还符合GB / T 11718-2009的中国中密度纤维板（MDF）标准的要求。由于生物原料是可回收利用的生物质，因此用改性大豆蛋白胶粘剂粘合的纤维板无毒且易于生物降解。另外，优选利用燃烧产生雾气的稻草。

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