Cause Analysis of Blistering Failure of Polyurethane Coating on a Headphone
The failed sample was a headphone coating,equipped with headphone wires.The main material of the coating was polyurethane,and blisters were appeared in the coating during used.In order to find the cause of coating blistering,electronic morphology and elemental composition were compared between the blistering position and the normal position of the headphone coating.The composition was compared using solution extraction,and elemental and compositional analysis was performed on the matching headphone wires.The results showed that the blisering position of the coating had more phosphorus(P)than the normal position,and P entered the interior of the coating in the form of organic P-based flame retardants such as triphenyl phosphate and toluene diphenyl phosphate,causing the coating to swell and detach from the substrate,resulting in coating blistering.Organic P-series flame retardants such as triphenyl phosphate and toluene diphenyl phosphate came from paired headphone wires,which evaporated and migrated to the interior of the coating in the surrounding environment.The effective improvement measures to prevent such failures from happening again was proposed.
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