Abstract:
Polyvinyl butyral resin(PVB) is widely used in laminated glass due to its unique mechanical properties. In order to study the influence of environmental aging on the tensile mechanical properties of laminated glass, the artificial accelerated aging test of laminated glass was carried out according to the two aging factors of solar light(UV irradition) and ambient temperature. The tensile mechanical properties of PVB layer in laminated glass after aging at different irradiation intensities and temperatures were studied by quasi-static tensile test and split Hopkinson tension bar(SHTB) test. The experimental results show that the tensile mechanical properties of PVB adhesive have strong strain rate sensitivity, and under quasi-static loading, it shows viscoelasticity, while under dynamic loading, it shows more brittle characteristics. The tensile strength of PVB decreases with the increase of UV irradiation intensity or irradiation time. The tensile strength of PVB will decrease with the increase of aging time at high temperature environment of 80 ℃, while at 40 ℃, the tensile properties will not change. The effect of temperature aging is stronger than that of light, and the influence of aging factors on mechanical properties increases with the increase of strain rate. Infrared spectroscopy test showed that hydroxyl aging products were formed in PVB samples after light aging and high temperature aging, indicating that some material was decomposed, resulting in the decrease of mechanical properties.