Modification of skim rubber blended with poly (vinyl alcohol) to be applied as a biodegradable pressuresensitive adhesive: Effect of 2,6-di-t-butyl-4- methylphenol and hydrocarbon resin

摘要

Pressure-sensitive adhesives (PSAs), or self-adhesives, are used in many applications, including safety labels for power equipment, automotive interior trim assembly, and sound/vibration-damping films. The objective of this study was to develop a biodegradable skim rubber-based bioadhesive blended with poly (vinyl alcohol) (PVA), which has the advantage of being biodegradable and biocompatible to humans. PSAs were produced from saponified low-protein skim rubber (SLPSR) alone using a hydrocarbon resin as a tackifier and blends of S-LPSR/PVA containing tackifier, via solution and emulsion, respectively. The influence of 2,6-di-t-butyl-4-methylphenol (BHT) and the hydrocarbon resin content in the adhesive formulation was studied. Various methods were used to evaluate the properties of the adhesives produced including scanning electron microscopy, differential scanning calorimetry, contact angle measurement, dynamic mechanical thermal analysis, and Fourier transform infrared spectroscopy. The optimal concentration of PVAfor a good PSA was found to be 20 phr because of its emulsion form. The adhesion properties of a PSA containing 50-60 phr of hydrocarbon resin and1% BHT displayed excellent tack and peel compared with other samples because there was no chain scission of the skim rubber and good compatibility and interaction between the S-LPSR/PVA blend and the hydrocarbon resin, which maximized the adhesion properties of the adhesive.