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Adhesive Performance of UV-cured Clearcoat on Galvanized Steel
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Adhesionsegenskaper hos UV-lacker på galvaniserat stål (Swedish)
Abstract [en]

A study has been carried out regarding the possibility for application of UV-cured coatings on different pretreated galvanized steel, in coil coating application. In order to address the questions about whether the adhesion will be affected and how, when combining respective coating with a steel substrate. Two types of UV-curable formulations have been applied respectively, acrylate-based free radical formulation and epoxy-based cationic formulation, on five types of steel substrates. In addition, UV-LED was also investigated as an alternative energy source.

The aim is to explore the curing of the coatings, the surface topology and hydrophilicity, the material and mechanical properties of coatings and coated systems respectively. It was found that the acrylate coating gives a hydrophilic surface while the epoxy coat is hydrophilic but is more hydrophobic than acrylate. The acrylate resin is not compatible with Standard Ti-pretreatment from PO substrates and the curing of epoxy is inhibited by pretreatment primer in PP substrates. Curing using UV-LED is possible and should be investigated further. No comparison could be made between coating systems acrylate and epoxy, regarding the adhesive performance, due to the failure of obtaining the right thickness for the acrylate coating.

 

Abstract [sv]

I denna studie undersöktes möjligheten att applicera UV-härdande lacker på olika förbehandlade galvaniserade stålsorter för bandlackering. Detta för att förstå mer om vidhäftningen påverkas av, och på vilket sätt, kombinationen av respektive UV-lack med olika metallsubstrat. Två olika UV-formuleringar, akrylat and epoxy, applicerades på fem olika stålsubtrat och även screeningsstudie på UV-LED utfördes.

Målet är att undersöka uthärdning av lackeringar, topologin och hydrofilicitet, material och mekaniska egenskaper hos färglacken och de lackade systemen, samt möjlighet att använda LED-lampa som UV-källan. Resultatet visar att akrylat ger en hydrofil yta medan epoxy är hydrofil men är mer hydrofob än akrylat. Akrylatet är inte kompatibelt med Standard Ti-pretreatment från PO substrat och uthärdning av epoxy inhiberas av förbehandlade primer på PP-prover. Uthärdning med UV-LED är möjligt och bör undersökas ytterligare. Det gick inte att jämföra mellan de två UV-formuleringarna, akrylat och epoxy, på grund av fel tjocklek hos akrylatfilmerna.

Place, publisher, year, edition, pages
2019. , p. 34
Keywords [en]
galvanized steel, UV-cured coatings, adhesion
Keywords [sv]
UV-lack, galvaniserat stål, ytbehandling, vidhäftning, egenskaper
National Category
Chemical Engineering Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-261149OAI: oai:DiVA.org:kth-261149DiVA, id: diva2:1356725
External cooperation
SSAB
Educational program
Master of Science in Engineering - Engineering Chemistry
Supervisors
Examiners
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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