Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral - Monograf

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Preparation and characterization of strong all surface adhesive based on scrap rubber powder
(2024-08-01)
Adam Ahmad Bin Azami
This study reports a novel method of reducing rubber waste by producing all strong surface adhesive from wasted rubber powder. The method comprised devulcanizing scrap rubber powder in an autoclave with TESPT (Triethoxysilylpropyl tetrasulfide) as a devulcanizing aid. The devulcanized rubber was then mixed with natural rubber (SMR 10) and gum rosin using a two-roll mill, followed by dilution in various solvents such as gasoline, toluene and xylene to make the adhesive. To identify the most optimal conditions, important parameters such as TESPT loading, devulcanization time, and temperature were tested. The structural modifications of the devulcanizate were investigated using Fourier Transform Infrared (FTIR) spectroscopy, with a focus on the S-S and C-S bond peaks at 555 and 574 cm-1, respectively. The results showed that higher TESPT loadings and longer devulcanization times considerably increased devulcanization efficiency, as seen by the shortest peaks at the desired wavelengths. Lap shear tests on rubber and plastic substrates were used to evaluate adhesive performance, and adhesives with 40 % solid content in toluene demonstrated the maximum shear stress. The findings highlight the efficacy of TESPT-assisted devulcanization in an autoclave as a method for recycling rubber waste and manufacturing high-performance adhesives.