Technical characteristics of rigid sprayed PUR and PIR foams used in construction industry

Gravit, Marina; Kuleshin, Aleksey; Khametgalieva, Elina; Karakozova, Irina

doi:10.1088/1755-1315/90/1/012187

Cited by 10 publications

(3 citation statements)

References 16 publications

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“…Therefore, researchers have focused their attention on improving their insulating performance in order to reach similar values to those of silica aerogels. The most interesting matrixes are based on polyisocyanurate or polyurethane, two matrixes that have been commonly used for insulation in the construction sector in the form of foams [87][88][89][90]. Nevertheless, the thermal conductivity reached by these polymeric foams is far from the targeted insulating performance.…”

Section: Pu-aerogels: Effect Of Structural Properties On the Thermal ...mentioning

confidence: 99%

Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

et al. 2022

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Nowadays, our society is facing problems related to energy availability. Owing to the energy savings that insulators provide, the search for effective insulating materials is a focus of interest. Since the current insulators do not meet the increasingly strict requirements, developing materials with a greater insulating capacity is needed. Until now, several nanoporous materials have been considered as superinsulators achieving thermal conductivities below that of the air 26 mW/(m K), like nanocellular PMMS/TPU, silica aerogels, and polyurethane aerogels reaching 24.8, 10, and 12 mW/(m K), respectively. In the search for the minimum thermal conductivity, still undiscovered, the first step is understanding heat transfer in nanoporous materials. The main features leading to superinsulation are low density, nanopores, and solid interruptions hindering the phonon transfer. The second crucial condition is obtaining reliable thermal conductivity measurement techniques. This review summarizes these techniques, and data in the literature regarding the structure and thermal conductivity of two nanoporous materials, nanocellular polymers and aerogels. The key conclusion of this analysis specifies that only steady-state methods provide a reliable value for thermal conductivity of superinsulators. Finally, a theoretical discussion is performed providing a detailed background to further explore the lower limit of superinsulation to develop more efficient materials.

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Section: Pu-aerogels: Effect Of Structural Properties On the Thermal ...mentioning

confidence: 99%

Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

et al. 2022

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“…For the developed Russian standard for rigid PUR and PIR foams [9], it is necessary to harmonize the ISO 4590 standard to determine the volume percentage of open and closed cells of rigid sprayed polyurethane foam, since the first method is similar to the method in ASTM D 6226, the method in ISO 4590 contains the classification according to groups the number of closed cells, which are further referred to European standards for polyurethane foam.…”

Section: Resultsmentioning

confidence: 99%

Methods for determining the number of closed cells in rigid sprayed polyurethane foam

2018

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Polyurethane foams are currently the most effective thermal insulation materials, polyisocyanurates have low combustibility. Predicting the number of closed cells forming a gas-filled matrix in the finished polymer is necessary to improve the quality and durability of rigid sprayed polyurethane foam (SPF) and also be able to determine their quantity in finished coatings using standardized techniques. Depending on the number of closed cells, the polyurethane coatings are classified into certain levels in European documents. The methods of determining the volume percentage of open and closed cells of polyurethane foam, the problems of applying these methods, measuring equipment and their errors are analyzed in the article. The authors analyzed the international standard ISO 4590 for determining the volume percentage of open and closed cells spread in the EU countries and the American standard ASTM D 6226 for the purposes of harmonization of European standards with the developed national standard for PUR insulation and polyisocyanurate (PIR), sprayed on the site of production.

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“…Although PIR is a widely used thermal insulation material, it has some drawbacks that may limit its applicability and efficiency in certain situations. For instance, PIR can deteriorate under moist conditions, lose shape and integrity due to temperature changes, react adversely with some chemicals, perform poorly at very low temperatures, and cost more than other insulation options [57].…”

Section: Polyisocyanuratementioning

confidence: 99%

Mycelium-Based Thermal Insulation for Domestic Cooling Footprint Reduction: A Review

Al-Qahtani,

Koç,

Isaifan

2023

Sustainability

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Domestic cooling demands in arid and hot climate regions, including Qatar, induce a significant challenge to reduce the area’s cooling energy consumption and carbon footprint, primarily due to the heavy reliance on electricity-intensive air conditioning systems. The inadequacy and inefficiency of conventional construction and insulation materials and their improper implementation further exacerbate this issue. Considering such challenges, this research comprehensively evaluates an unconventional and innovative solution recently proposed for this purpose: mycelium-based thermal insulation. Mycelium is the vegetative, thread-like structure of fungi, consisting of a network of branching hyphae that facilitate nutrient absorption and environmental interactions. This review paper analyses mycelium-based composites, focusing on their mechanical, physical, and chemical characterization. It also explores the potential of mycelium as a sustainable solution for indoor temperature regulation, particulate matter absorption, and bioremediation. Moreover, this review examines various available insulation materials and highlights the unique advantages offered by mycelium-based composites. As a result, the literature review indicates that mycelium exhibits exceptional thermal and acoustic insulation properties owing to its low thermal conductivity, favorable water absorption coefficient, porous structure, and considerable mechanical strength. This porous architecture facilitates efficient air purification, improving indoor air quality. Additionally, mycelium shows promise in actively degrading pollutants such as hydrocarbons, heavy metals, and pesticides in soil and water.

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Technical characteristics of rigid sprayed PUR and PIR foams used in construction industry

Cited by 10 publications

References 16 publications

Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

Methods for determining the number of closed cells in rigid sprayed polyurethane foam

Mycelium-Based Thermal Insulation for Domestic Cooling Footprint Reduction: A Review

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