Engineering Sustainable Waste Wool Biocomposites with High Flame Resistance and Noise Insulation for Green Building and Automotive Applications

Guna, Vijaykumar; Ilangovan, Manikandan; Vighnesh, H.R.; Sreehari, B.R.; Abhijith, S.; Sachin, H.; Mohan, C.B.; Reddy, Narendra

doi:10.1080/15440478.2019.1701610

Cited by 23 publications

(22 citation statements)

References 20 publications

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“…Patnaik et al [ 17 ] obtained thermal conductivity values between 0.032 and 0.033 W/mK wool–polyester composites. Guna et al [ 20 ] studied wool–polypropylene panels with λ values between 0.058 and 0.083 W/mK. Rubino et al [ 19 ], for wool–chitosan samples, obtained λ values of 0.049–0.060 W/mK.…”

Section: Discussionmentioning

confidence: 99%

“…Considering the values identified in the literature and the values measured in this study, it is observed that the latter ones are higher. Guna et al [ 20 ] studied a material based on wool fibres and polypropylene fibres (30 mm thickness) with a maximum sound absorption coefficient of 0.86 between 1500 and 2500 Hz. Broda and Bączek [ 55 ] investigated the properties of wool samples (10.6 mm thickness), measuring a maximum sound absorption value of 0.95 at 3150 Hz.…”

Section: Discussionmentioning

confidence: 99%

“… Thermal conductivity of samples; values of this study correspond to the minimum and maximum values recorded (data from refs. [ 17 , 19 , 20 , 40 , 50 ]). …”

Section: Figurementioning

confidence: 99%

“…The use of wool textile waste by preparing a composite thermal insulation material in which the textile fibres are bonded with a chitosan solution was presented by Rubino et al [ 19 ]. The preparation of wool and polypropylene fibre composites, by carding the two types of fibres, followed by hot pressing of the mixture, was presented by Guna et al [ 20 ]. The thermal conductivity of the resulting panels ranged from 0.058 to 0.083 W/mK.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Sheep Wool-Based Composites for Building Insulation

et al. 2022

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The aim of this paper is to propose ecological thermal insulation materials that meet the goals of sustainability but also fulfill the imposed thermal performance requirements. This paper studies new composite materials based on sheep wool from the perspective of thermal conductivity. The composites were prepared using two types of binder: acrylic-polyurethane resin and natural rubber latex, which were applied to the wool fibres through different methods and percentages. Based on the obtained results of thermal conductivity, two types of samples were selected for further analysis, which aimed to determine the microstructure, chemical composition, water absorption, attack of microorganisms, water vapour permeability, hygrothermal adsorption characteristics and sound absorption of the samples. In order to analyse the variation of thermal conductivity, the following parameters were taken into account: thickness, density, type of binder and percentage of binder. Following the obtained results, it was observed that the value of the thermal conductivity of the samples varies between 0.0324 and 0.0436 W/mK. It was found that all the samples prepared and analysed in this study fulfil the national criteria for the thermal performance of thermal insulation material. After conducting the in-depth analysis of the two selected sample types, it was concluded that both materials have good sound absorption characteristics over the considered frequency range. In addition, as it was expected from the natural fibres, the samples had low resistance against the attack of microorganisms and water-related tests.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“… Thermal conductivity of samples; values of this study correspond to the minimum and maximum values recorded (data from refs. [ 17 , 19 , 20 , 40 , 50 ]). …”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Sheep Wool-Based Composites for Building Insulation

et al. 2022

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“…The automobile industry is not exempt from this and seeks to fabricate various automobile parts derived from natural and renewable raw materials rather than traditional synthetic fibres (glass, carbon, aramid fibres etc.) and petroleum-based oils for polyurethane foams [ 5 , 6 , 7 , 8 ]. Besides, it has been found that every year, in the European Union, end-of-life vehicles (ELV) generate around 8–9 million tonnes of waste [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Lightweight Insulation Materials from Textile-Based Waste for the Automobile Industry

et al. 2021

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Globally, automotive manufacturers are looking for ways to produce environmentally sustainable and recyclable materials for automobiles to meet new regulations and customer desires. To enable the needs for rapid response, this study investigated the feasibility of using waste and virgin wool fibres as cost-effective and sustainable alternatives for automotive sound and heat insulation using a chemical-free approach. Several properties of the currently available commercial automotive insulators were investigated in order to facilitate the designing of green wool-based needle-punched nonwoven materials. The effect of fibre diameter, nonwoven surface, layer structure, thickness, and area density on sound absorption and thermal resistance was investigated. The results suggested that the wool nonwoven materials, fabricated using waste and virgin wool fibres, possessed extremely efficient acoustic and thermal insulating properties comparable with the currently used commercial synthetic insulating materials. Besides, the wool nonwoven materials showed identical antibacterial and antifungal properties with a greater biodegradation rate (50%) than that of the commercial synthetic insulating materials. Hence, this study showed that natural wool fibres have the potential to be used as green, lightweight, and sustainable materials in the automobiles, while they qualify for Reuse–Recycle and Reuse–Recover purposes at the end-of-life of vehicles.

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