Quasi-static tests on polyurethane adhesive bonds reinforced by rubber powder

Abstract

Waste from tires is a global issue. New recycling methods allowed to create rubber powder from tire waste. This research shows a possibility of this rubber powder to reduce the impact of waste tires on environment. Polyurethane adhesive reinforced by rubber powder creates an interesting composite, which can be used across all fields of industry. Adhesive bonding is a progressive technology of bonding various materials. This research is one part of the study on reinforced polyurethane adhesive by rubber powder, which shows the influence of microparticles on mechanical properties. This research follows interactions of rubber powder microparticles and polyurethane adhesive in quasi-static fatigue on mechanical properties. Quasi-static test of adhesive bonds simulates real conditions in practice. The quasi-static test of adhesive bonds was set on 200, 500 and 1000 cycles. The influence of strength and elongation on reinforced polyurethane adhesive in the quasi-static test was compared with the results from the static mechanical tests. The interactions of rubber powder microparticles, polyurethane adhesive and adherend were analysed by SEM in three layers. Polyurethane adhesive properties are good sealing and adhesion to various materials, i.e. suitable for filler modification. The weaknesses of polyurethane adhesive are low strength and high price. Reinforcing by rubber powder is effective for polyurethane adhesive, because it does not limit the sealing properties, increases the strength of bonds and can reduce the price. The modification of polyurethane adhesive by rubber powder was in various concertations 5, 10 and 15 wt. %. The quasi-static tests prove increasing influence of rubber powder on mechanical properties by percentage difference. The strength of reinforced polyurethane adhesive increased by 17 % and the elongation positively decreased by 6 %.