2.2.2. Manufacturing of rice straw thermal insulation boards (RSTIB)
The resin content of MDI was 8% based on the weight of the oven dried rice straw particles. To reduce the viscosity of MDI,acetone was added into the adhesives for diluting at a quantity ratio of 1:1. The MDI resin acetone mixture was stirred to make it uniform, and then, the mixture was sprayed onto the particles using a rotating drum blending machine with an air-atomization nozzle. The blended particles were shaped using a forming box