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Nutzung von Lignin-Aerogelen in der gezielten industriellen Anwendung : Blow-in-Dämmung als Prototyp
Citation Link: https://doi.org/10.15480/882.5110
Publikationstyp
Conference Poster not in Proceedings
Date Issued
2023-03
Sprache
German
Author(s)
Institut
TORE-DOI
Citation
Jahrestreffen der DECHEMA-Fachgruppen Hochdruckverfahrenstechnik und Lebensmittelverfahrenstechnik (2023)
Contribution to Conference
Many climate change agreements including paris agreement and european union 2020 emphasized the importance of improving energy efficiency of buildings as a critical measure to limit global warming; thus increasing the need to develop energy-efficient and low-carbon solutions for buildings and construction [1], [2]. Biopolymer aerogels represent innovative insulation materials due to their distinctive properties such as low density, high surface area and a very low thermal conductivity (e.g. 0.017 W.m-1.K-1) [3]. However, some factors delay their utilization into industrial applications such as high price, sensitivity to moisture, low mechanical stability (in some cases) and challenges associated with scale up [4].
Lignin represents a renewable biopolymer when incorporating with aerogels led to a mechanically stable biopolymer aerogel with higher hydrophobicity consequently less sensitivity to moisture [5]. Aim of this study is therefore to evaluate the potential of lignin as additive in alginate aerogels in order to enhance application relevant properties.
In this study, lignin microparticles were mixed with aqueous alginate solutions and hydrogel particles were produced via dripping method in calcium chloride solution to facilitate ion induced gelation of alginate. Thereafter, the CO2 supercritical dried alginate-lignin hybrid aerogel particles were mixed with cellulose fibers and then blown into hollow wood frames using blow in technique. Aerogel particles were evaluated in terms of particle morphology and porous structure, while the aerogel cellulose fiber mixtures were evaluated in terms of homogeneity and thermal conductivity.
The preliminary results showed that alginate-lignin hybrid aerogels are sufficiently stable thus suitable to be used as a raw material for blow in insulation. Replacement of cellulose fibers by lignin aerogel particles up to 32 wt% decreased the thermal conductivity by 9% and a lower thermal conductivity of 34.09 W.m-1.K-1 was achieved. The targeted application is thermal insulation material for building elements.
Lignin represents a renewable biopolymer when incorporating with aerogels led to a mechanically stable biopolymer aerogel with higher hydrophobicity consequently less sensitivity to moisture [5]. Aim of this study is therefore to evaluate the potential of lignin as additive in alginate aerogels in order to enhance application relevant properties.
In this study, lignin microparticles were mixed with aqueous alginate solutions and hydrogel particles were produced via dripping method in calcium chloride solution to facilitate ion induced gelation of alginate. Thereafter, the CO2 supercritical dried alginate-lignin hybrid aerogel particles were mixed with cellulose fibers and then blown into hollow wood frames using blow in technique. Aerogel particles were evaluated in terms of particle morphology and porous structure, while the aerogel cellulose fiber mixtures were evaluated in terms of homogeneity and thermal conductivity.
The preliminary results showed that alginate-lignin hybrid aerogels are sufficiently stable thus suitable to be used as a raw material for blow in insulation. Replacement of cellulose fibers by lignin aerogel particles up to 32 wt% decreased the thermal conductivity by 9% and a lower thermal conductivity of 34.09 W.m-1.K-1 was achieved. The targeted application is thermal insulation material for building elements.
DDC Class
540: Chemie
600: Technik
620: Ingenieurwissenschaften
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Nutzung von Lignin-Aerogelen in der gezielten industriellen.pdf
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