Investigation on influence of raw material type on properties of of lingo-cellulosic insulation composite

The goal of this study was the production of thick insulation panel with lingo-cellulosic residuals and biodegradable binder and evaluation of their physical and mechanical properties. Previous studies showed that the application of lingo-cellulosic residuals in the building has a long history in different places of the world. Many research found that useful to use lingo-cellulosic materials such as bagasse, wheat, and rice straw and sunflower stem in the composition of wood-based panels to improve physical performance. The panels were made with 150, 175 and 200 kg.m-3 density and 30 mm thickness with using three types of raw materials include; wheat, rice, and rapeseed straws. The bonding agent was Vinyl-Acetate homopolymer and the production process consisted of cold press and 55 ° C close system dryer. The compression strength perpendicular to surface and modulus of elasticity were evaluated as mechanical characteristics and sound transmitted class, the rate of temperature exchange and heat conductivity tests were done to probe the physical performances. The results showed that the material type has a significant effect on the physical properties and mechanical performances of produced panels. The panels made with rapeseed straws represented the higher amount of compression strength (64 kPa) and modulus (930 kPa) compare to two other raw materials while the physical performance of it was lower than that of wheat and rice straws. Overall, the insulation panels made with natural raw materials represented higher STC than Polystyrene panels. The STC of insulation panels made from wheat straw with highest density was measured as 17 dB. The results of the heat conductivity test showed that the heat conductivity coefficient of panels made with wheat and rice straws meet the coefficient of heat insulation materials. An increase in panel density caused an enhancement in all properties especially in wheat straw panels. The lingo-cellulosic materials result from agricultural crops like wheat, rice, and rapeseed could be used as suitable raw materials to produce green insulating panels. Among them, the wheat and rice straw due to better performance in sound absorption and heat insulation, are preferred rather than rapeseed. With this kind of panels, it is possible to reduce petroleum derivatives usage in construction and compensate a part of the minus effects of this industry on the environment. Using lower energy during the production and a small amount of greenhouse gas outcome compare to synthetic materials are two specific features of biodegradable composites which caused production and wide application of them especially in industrialized nations.