Sound Absorbing Insulating Composites Based on Polyurethane Foam and Waste Materials

Abstract

The acoustic comfort includes the protection against noise and it is closely related to the sound absorption concept. This paper presents an experimental study on sound absorption coefficients, for some composite materials: waste materials (rubber crumbs, textile, flax fibers) mixed with rigid polyurethane foam as binder. The composite materials were characterized both acoustically (sound absorption coefficient) and also in terms of heat transfer (thermal conductivity). The acoustic absorption coefficient was determined using the impedance tube and the influence of structure of these materials on the sound absorbing properties was analyzed. The experimental results show the sound absorption performances of some composites based on recycled waste materials, thus promoting environmentally friendly solutions.

Influence of Flame Retardant Impregnation on Acoustic and Thermophysical Properties of Recycled Technical Textiles with the Potential for Use in Wooden Buildings

“…On the other hand, the sound absorption ability of material with 10% textile waste content increased in the frequency interval 1.1–2.8 kHz in comparison with the 100% rigid polyurethane foam material. In this case, maximum value of sound absorption coefficient was 0.7 at 1.2 kHz [ 41 ].…”

Preparation and Modification of Flexible Polyurethane Foam for Effective Flame Resistance and Sound Absorption

“…Noise pollution problem, as a major pollution problem in the world, affects our daily lives all the time and causes a series of detriments to human health [1,2]. Reducing the noise from the source is a good way to solve the noise pollution problem, but it is difficult to realize in many conditions.…”

Archives of Metallurgy and Materials

“…in the context of circular economy, the trend is more and more waste should gain added value and close the loop -a better solution than comprehensive recovery. nonetheless managing waste represents a design challenge and future products should be redesigned to be re-used in the current shape and at the same time remanufacturing and recycling should become more facile [25][26][27][28].…”