Abstract

The current accelerated development of industrial and agricultural production has intermittently generated a large amount of waste. One of these residues is the rice husk, which represents 20% of the total volume of the grain produced. It is a lignocellulosic material that can be used as a reinforcement for composite materials. In turn, castor oil-based polyurethane resin is a triglyceride extracted from the seed, widely used to replace synthetic resins that are more aggressive to the environment. Thus, the objective of this study was to obtain a sustainable agglomerated composite based on rice husk and castor oil polyurethane resin. The samples were obtained by cold molding according to a 2 ^k (DoE) factorial design, the matrix/reinforcement volume fraction and the molding volume being the factors studied. The composite obtained was tested according to NBR 14,810, used for medium-density composites. Density, swelling, water absorption and resistance to flexion were evaluated. The results obtained allow us to classify the composite as low density, with values below 640 kg/m³ according to the A 208.1 standard. Regarding the mechanical behavior, the composite does not meet the standard NBR 14,810 for medium density but meets the standard A 208.1 being classified as low-density LD-1 and LD-2.

Graphical abstract

中文翻译：

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由蓖麻聚氨酯树脂配制并用稻壳增强的可持续团聚复合材料的开发和表征

摘要

当前工农业生产的加速发展间歇性地产生了大量废物。这些残留物之一是稻壳，占谷物总产量的20％。它是一种木质纤维素材料，可用作复合材料的增强材料。反过来，蓖麻油基聚氨酯树脂是从种子中提取的甘油三酸酯，广泛用于替代对环境更具腐蚀性的合成树脂。因此，本研究的目的是获得一种基于稻壳和蓖麻油聚氨酯树脂的可持续团聚复合材料。通过2  ^k的冷成型获得样品（DoE）析因设计，基体/增强体积分数和成型体积是研究的因素。根据NBR 14,810对用于中密度复合材料的复合材料进行了测试。评价了密度，溶胀，吸水率和抗弯曲性。获得的结果使我们能够将复合材料归类为低密度，根据A 208.1标准，其值低于640 kg / m ³。关于机械性能，该复合材料不符合中密度标准NBR 14,810，但符合分类为低密度LD-1和LD-2的标准A 208.1。

图形概要