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Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding

Diana Meza Rojas, James Holliman, David Penney Orcid Logo, Anthony Lewis, Peter Holliman Orcid Logo

Recycling, Volume: 11, Issue: 4, Start page: 69

Swansea University Authors: Diana Meza Rojas, James Holliman, David Penney Orcid Logo, Anthony Lewis, Peter Holliman Orcid Logo

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DOI (Published version): 10.3390/recycling11040069

Abstract

A method has been developed to delaminate the organic components (paint, foam) from the steel skins of composite polyisocyanurate (PIR) steel insulation panels at ambient temperature and in 20 min using selected solvents combined with ultrasonication. Using this method, polyisocyanurate foam can be...

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Published in: Recycling
ISSN: 2313-4321
Published: MDPI AG 2026
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URI: https://cronfa.swan.ac.uk/Record/cronfa71663
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last_indexed 2026-04-28T04:31:37Z
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Using this method, polyisocyanurate foam can be selectively delaminated from polymer-based paint (PVC plastisol) and, in turn, the polymer paint can be selectively delaminated from the galvanised steel. Both the foam and paint are removed as intact layers, leaving the galvanised steel intact for the next steps of recycling, enabling the subsequent individualised recycling of each sub-component or layer. Several solvents have been tested, and the data show that H-bonding solvents (e.g., H2O, alcohols) are less effective at delaminating these polymers. 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spelling 2026-04-27T15:38:05.3845754 v2 71663 2026-03-23 Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding 92aa16279e84326a8b8a808af38a7fdc Diana Meza Rojas Diana Meza Rojas true false 27316c5a756a7e4d107b0fe444f0b85d James Holliman James Holliman true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 328c21711ee3091505363e2b5060fba0 Anthony Lewis Anthony Lewis true false c8f52394d776279c9c690dc26066ddf9 0000-0002-9911-8513 Peter Holliman Peter Holliman true false 2026-03-23 EAAS A method has been developed to delaminate the organic components (paint, foam) from the steel skins of composite polyisocyanurate (PIR) steel insulation panels at ambient temperature and in 20 min using selected solvents combined with ultrasonication. Using this method, polyisocyanurate foam can be selectively delaminated from polymer-based paint (PVC plastisol) and, in turn, the polymer paint can be selectively delaminated from the galvanised steel. Both the foam and paint are removed as intact layers, leaving the galvanised steel intact for the next steps of recycling, enabling the subsequent individualised recycling of each sub-component or layer. Several solvents have been tested, and the data show that H-bonding solvents (e.g., H2O, alcohols) are less effective at delaminating these polymers. Whilst high polarity, medium H-bonding acetonitrile and DMSO remove PVC paint and some PIR foam, the most effective solvent for both PIR foam and PVC paint removal is medium polarity, medium H-bonding acetone. Journal Article Recycling 11 4 69 MDPI AG 2313-4321 delamination; organic coated steel; insulation foams; paint; infrared spectroscopy; corrosion inhibitor; circular economy 1 4 2026 2026-04-01 10.3390/recycling11040069 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) UKRI (EP/S018107/1, EP/Y528638/1) 2026-04-27T15:38:05.3845754 2026-03-23T17:14:09.3292534 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Diana Meza Rojas 1 James Holliman 2 David Penney 0000-0002-8942-8067 3 Anthony Lewis 4 Peter Holliman 0000-0002-9911-8513 5 71663__36615__ee39389f76074e8893986a7d81fbfbde.pdf 71663.VoR.pdf 2026-04-27T15:36:30.6122619 Output 4178882 application/pdf Version of Record true © 2026 by the authors. This is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. true eng https://creativecommons.org/licenses/by/4.0/
title Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
spellingShingle Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
Diana Meza Rojas
James Holliman
David Penney
Anthony Lewis
Peter Holliman
title_short Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
title_full Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
title_fullStr Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
title_full_unstemmed Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
title_sort Selective Recycling of Steel Sandwich Polyisocyanurate (PIR) Foam Insulation Cladding
author_id_str_mv 92aa16279e84326a8b8a808af38a7fdc
27316c5a756a7e4d107b0fe444f0b85d
869becc35438853f2bca0044df467631
328c21711ee3091505363e2b5060fba0
c8f52394d776279c9c690dc26066ddf9
author_id_fullname_str_mv 92aa16279e84326a8b8a808af38a7fdc_***_Diana Meza Rojas
27316c5a756a7e4d107b0fe444f0b85d_***_James Holliman
869becc35438853f2bca0044df467631_***_David Penney
328c21711ee3091505363e2b5060fba0_***_Anthony Lewis
c8f52394d776279c9c690dc26066ddf9_***_Peter Holliman
author Diana Meza Rojas
James Holliman
David Penney
Anthony Lewis
Peter Holliman
author2 Diana Meza Rojas
James Holliman
David Penney
Anthony Lewis
Peter Holliman
format Journal article
container_title Recycling
container_volume 11
container_issue 4
container_start_page 69
publishDate 2026
institution Swansea University
issn 2313-4321
doi_str_mv 10.3390/recycling11040069
publisher MDPI AG
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description A method has been developed to delaminate the organic components (paint, foam) from the steel skins of composite polyisocyanurate (PIR) steel insulation panels at ambient temperature and in 20 min using selected solvents combined with ultrasonication. Using this method, polyisocyanurate foam can be selectively delaminated from polymer-based paint (PVC plastisol) and, in turn, the polymer paint can be selectively delaminated from the galvanised steel. Both the foam and paint are removed as intact layers, leaving the galvanised steel intact for the next steps of recycling, enabling the subsequent individualised recycling of each sub-component or layer. Several solvents have been tested, and the data show that H-bonding solvents (e.g., H2O, alcohols) are less effective at delaminating these polymers. Whilst high polarity, medium H-bonding acetonitrile and DMSO remove PVC paint and some PIR foam, the most effective solvent for both PIR foam and PVC paint removal is medium polarity, medium H-bonding acetone.
published_date 2026-04-01T06:29:38Z
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score 11.105204

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