Method of producing an improved vibration damping and sound absorbing coating on a rigid substrate

摘要

A novel method of producing a vibration damping and sound absorbing coating on a rigid substrate is provided in which method a first coating of a viscoelastic material having after gelling a modulus of elasticity of 5x106 to 5x108 dynes/cm2 is sprayed onto the substrate whereafter there is sprayed onto said first coating a second coating of a viscoelastic material having after gelling a modulus of elasticity of 5x107 to 5x109 dynes/cm2, the modulus of elasticity of said second outer coating being at least 10 times greater than that of said first coating.