Using natural rubber mixed with coconut coir for casting indoor acoustic and thermal insulation board

Abstract

This research aims to develop the coconut coir and fiber indoor acoustic and thermal insulation boards mixed with natural latex. The 5 ratios of coconut coir: coconut fiber: natural rubber were equal to 0.1: 0.9: 0.1, 0.1: 0.9: 0.15, 0.1: 0.9: 0.2, 0.1: 0.9: 0.25, and 0.1: 0.9: 0.3 by weight. The indoor acoustic and thermal insulation boards were produced by knitting the coconut coir and fiber, spraying the natural latex, and heat compressing. The properties testing of indoor acoustic and thermal insulation boards included the density test, water absorption test, tensile strength test, thermal conductivity test, sound protection efficiency test, and real usage test. From the results, 0.1: 0.9: 0.15 ratio is the most suitable ratio of coconut coir and fiber indoor acoustic and thermal insulation board mixed with natural latex. The natural latex which putted in these indoor acoustic and thermal insulation boards can reduce the water absorption, and increase tensile strength and sound protection efficiency.