Development of a Light-weight High-dampening Liquid-applied Sound Deadener Material

We have developed a new liquid-applied sound deadener material (LASD) that replaces asphalt-type dampening materials to reduce both automotive weight and the workload of factory associates. Compared to a loss factor of 0.30, this LASD is 62% lighter than conventional materials; compared to an area weight of 2.4kg/m², it displays a 172% higher loss factor.

This effect was obtained because the developed liquid-applied sound deadener material uses acrylic resin with a maximum tan δ at 34°C, with the expansion ratio set to 1.8 times. In addition, the viscosity of the liquid-applied sound deadener material was adjusted so the thixotropy would be high at shear speeds of 10 to 3000S^-1 to minimize irregularities in the surface when a slit nozzle is used to apply the sound deadener material.