PURPOSES : In this study, we aimed to develop an absorption and insulation soundproof board with excellent noise reduction ability using waste tire powder. METHODS : An optimum mix ratio of sound absorption material and sound insulation material was derived through a sound absorption test and a compressive strength test; a combustion test was performed to confirm whether the combustibility evaluation criteria were satisfied. Additionally, to derive a shape with excellent noise reduction ability, noise prediction simulation was performed. RESULTS : Through the sound absorption test, compressive strength test, and combustion test, an optimum mix ratio of sound absorption material and sound insulation material as well as a shape with excellent noise reduction ability was derived through noise prediction simulation. CONCLUSIONS : An absorption and insulation soundproof board was applied with sound absorption material and sound insulation material developed using waste tire powder. The recycling rate improved; thus, excellent noise reduction ability can be expected by developing not only materials but also shapes.

Antioxidant agent, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane were prepared and investigated the antioxidant activity on recycled rubber mat manufactured with waste tire powder. Mechanical properties of rubber mat are influenced by many factor such as compounding ingredients and state of cure, process of rubber, and fillers. Our study aim is to investigate influence of antioxidant activities on ozone cracking and the thermal aging time. In this work, the degradation of recycled rubber mat was studied and suggested mechanism to involve two-type of degradation, thermal aging and cracking both of which can be contained antioxidant or non-antioxidant agent.