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

Abstract

This article presents the results of an investigation of acoustic and thermophysical properties of insulation panels made from recycled technical textiles originating from the automotive industry. Measurements were performed on the samples of insulation panels (Senizol AT XX2 TL60), which were modified with liquid flame retardants (ISONEM® ANTI-FIRE SOLUTION, ECOGARD® B45, HR Prof). Another method of treatment was carried out by surface application of non-flammable facing (woven carbon fibre, nonwoven carbon fibre). Retardants were applied to the samples by surface spraying and soaking. The results showed a high ability of material to absorb sound in the frequency range 350 Hz–2 kHz. The sound absorption coefficient ranged from 0.82 to 0.9 in the frequency range 500 Hz–2 kHz. The noise reduction coefficient is 0.75. After material modification with the flame retardants, there was no significant change of sound absorption. The thermal conductivity coefficient of material before modification was 0.038 W⋅m−1⋅K−1. After application of the flame retardants, the thermal conductivity coefficient increased depending on type and method of retardant application in the range of 2.6–105.3%. The smallest change was detected after modification of material with ECOGARD® B45.

The effect of flame retardants on the fire technical characteristics of recycled textiles

“…The results of previous research 53 on the insulation material Senizol AT XX2 TL60 showed that the flame retardant treatments we used did not cause a deterioration in the sound absorption of this material made from recycled technical textiles. Even after treatments, this material achieves high and almost constant sound absorption in the interval of 600 Hz to 2000 Hz, and according to the ISO 11654:1997 standard, it can be classified in sound absorption class A.…”

“…The exception is the treatment of the material with ECOGARD® B45 flame retardant, as the insulating material retained very good thermal insulation characteristics after both methods of application. 53 Based on a comprehensive evaluation of the fire technical, acoustic, and thermophysical characteristics of the Senizol AT XX2 TL60 material, it turns out to be the best treatment by dipping in the ECOGARD® B45 retardant. This method of fire protection increased the fire resistance of the insulating material without worsening its thermal insulation and acoustic characteristics.…”

“…The exception is the treatment of the material with ECOGARD® B45 flame retardant, as the insulating material retained very good thermal insulation characteristics after both methods of application. 53…”

“…52 The aim was to determine the influence of selected flame retardants on sound absorption (sound absorption coefficient) and thermophysical characteristics (coefficient of thermal conductivity, thermal diffusivity, and specific heat capacity) of insulating materials made from recycled technical textiles. 53 These materials demonstrate the potential of use for various purposes (e.g., interior decoration, construction purposes, especially in wooden constructions). 54 This work aimed to determine the effect of selected flame retardants on the physical properties (surface tension, viscosity) and fire technical characteristic properties (flame propagation, gross calorific value, and mass loss) of Senizol AT XX2 TL60 material.…”

“…52 The aim was to determine the influence of selected flame retardants on sound absorption (sound absorption coefficient) and thermophysical characteristics (coefficient of thermal conductivity, thermal diffusivity, and specific heat capacity) of insulating materials made from recycled technical textiles. 53 These materials demonstrate the potential of use for various purposes (e.g., interior decoration, construction purposes, especially in wooden constructions). 54…”