Effect of hollow glass microsphere on flame retardant and mechanical properties of polyurethane foams

By adding a glass microsphere that was modified by different methods to a polyurethane foam system, a hollow glass microsphere/polyurethane foam composite was prepared. The effect of the modified method, the additive amount of glass microsphere on the burning and mechanical properties of rigid polyurethane foam was studied. The results show that after adding a glass microsphere, the mechanical properties of rigid polyurethane foam were reduced, and the combustion performance was improved. Comparing adding a hollow glass microsphere that modified by adding microcapsules to the coupling agent, the mechanical properties of polyurethane composite foam were declined slowly, and the inflame-retarding effect was also significantly improved. When the additive amount of hollow glass microsphere modified by microcapsules was 6%, the compressive strength and compressive modulus of polyurethane foam were decreased by 13.0% and 4.6% respectively. When the amount of hollow glass microsphere modified by microcapsules was 8%, the level combustion weightlessness speed of polyurethane declined from 0.024g/s to 0.015g/s.