Projects

Adhesives and sealants with sound insulating properties

© Photo Fraunhofer IBP

Measurement st-up to determine the modules of elastivity and the loss factor of resilient adhesives and sealants in dependence of frequendy.

Adhesives and sealants with resilient properties are of significant importance for current construction engineering. The range of application is versatile comprising all sectors of construction, be it the bonding of building components, the sealing of joints or waterproofing of openings. As concerns the properties of application such as bonding, tear resistance and durability significant progress was made in the past years with regard to adhesives and sealants. The acoustic performance did not have priority so far although joint sealing and adhesive connections especially in the field of building services constitute a substantial sound transmission path. In this context, first of all the connections to the building are decisive by which vibrations and structure-borne sound are transmitted to the building. Resilient intermediate layers, for example joint seals, can considerably reduce sound transmission in connection areas, since they act as vibration-isolating elements due to their elasticity. A condition, however, is that the adhesives and sealants have adequate acoustic properties and that the building components involved are acoustically synchronized.

The objective of the joint research project was to investigate in detail the properties of adhesives and sealants as well as their interaction in practice. Besides dealing with questions of application the focus is on the development of innovative acoustically optimized materials. It can already be stated that there are significant acoustic differences between materials which are used at present. These findings alone contribute to improve the acoustic quality. Development work, however, will be continued. In this context, a measurement device is of significant importance allowing the determination of acoustically substantial properties of adhesives and sealants, especially the modulus of elasticity and loss factor in dependence of frequency. Based on these measurement results it is now possible to formulate the correlations between the chemical composition, manufacturing process and required acoustic properties. Due to appropriate products noise emitted by permanent showers of neighbors will no longer be audible.