Thesis
Routes towards reducing hazards in industrial coatings
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2024
- Thesis identifier
- T16885
- Person Identifier (Local)
- 201553817
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- Isocyanate-terminated polyurethanes and amine-epoxy flooring compositions are coming under increasing legislative pressures. In this regard, the primary motivation for the research work described in this thesis was the development of commercially exploitable alternatives to these long-standing technologies. The research focus is on less-hazardous routes towards ambient-cured coating systems. Silane-terminated polyurethanes (STPs) have been used widely in the sealing and bonding markets for several years. However, their use in coatings, and in particular in liquid-applied membrane (LAM) roof coatings, is in its infancy. The existing STP LAM product has one major drawback, poor intercoat adhesion. This lack of intercoat adhesion is a commercial barrier towards the use of STPs as a viable long-term replacement for isocyanate-terminated polyurethanes in LAM roof coatings. Through the current research, it has been demonstrated that a popular group of reactive diluents, used to control STP viscosity, is the root cause of poor STP LAM intercoat adhesion. As well as highlighting migration as the issue with these reactive diluents, a non-reactive VOC solvent was used as a replacement to produce an STP LAM roof coating with excellent intercoat adhesion. Copper-catalysed azide-alkyne cycloaddition (CuAAC) curing was investigated as a potential replacement for epoxy-amine flooring compositions. The main issue identified was nitrogen release during bulk two-component mixes of the azide and alkyne, which limits on the commercial viability of such a curing mechanism. However, efforts were made to understand and resolve this problem; the addition of acetic acid prevented gas release and provided an excellent balance between pot life and cure speed. Despite this advancement, the use of CuAAC was shown to not provide the required film hardness under ambient cure conditions. However, it was demonstrated that tough coatings, analogous to epoxy-amine coatings, can be prepared after an annealing step. This has potential for other industrial coating applications.
- Advisor / supervisor
- Cormack, Peter
- Carter, Neil
- Martin, Ian
- Resource Type
- Note
- This thesis was previously held under moratorium from 18/04/2024 until 18/04/2026.
- DOI
- Date Created
- 2023
- Funder
- Embargo Note
Relations
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