2017
DOI: 10.1002/slct.201701372
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Catalysis of Forward and Reverse Reactions of ϵ-Caprolactam-Blocked Polyisocyanate: Double Arrhenius Plots and Equilibrium Temperatures of a Thermally Reversible Reaction

Abstract: ϵ‐Caprolactam blocked‐polyisocyanate is a commercially valuable raw material used mainly in the single‐package polyurethane coatings. In this study, kinetics of forward (blocking) and the reverse (deblocking) reactions of ϵ‐caprolactam‐blocked polyisocyanate catalysed by DABCO ‐ a tertiary amine, bismuth neodecanoate, calcium(II) 2‐ethylhexanoate – both non‐tin organometallics and a tin catalyst were studied using a hot stage FT‐IR spectrophotometer. It was found that calcium(II) 2‐ethylhexanoate showed highes… Show more

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Cited by 4 publications
(3 citation statements)
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“…It is a commercial isocyanate based on HDI in its trimer form and is primarily used as the hardener in two‐component polyurethane coatings with a NCO content of ≈22%. PUs from Desmodur N 3300 were produced with and without tin(II) 2‐ethylhexanoate as catalyst to investigate the catalytic effect . Additional experiments with modified carbohydrates (different D.S.)…”
Section: Methodsmentioning
confidence: 99%
“…It is a commercial isocyanate based on HDI in its trimer form and is primarily used as the hardener in two‐component polyurethane coatings with a NCO content of ≈22%. PUs from Desmodur N 3300 were produced with and without tin(II) 2‐ethylhexanoate as catalyst to investigate the catalytic effect . Additional experiments with modified carbohydrates (different D.S.)…”
Section: Methodsmentioning
confidence: 99%
“…However, the -NCO is prone to failure in water, and thus IPTS cannot be hydrolyzed and cannot be condensed into polymer coating. In order to solve this problem, caprolactam (CPL) can be used as a blocking agent to block the -NCO, which renders the -NCO inactive at room temperature and able to withstand extended exposure to water without deterioration [39][40][41][42]. Furthermore, the CPL-blocked -NCO can undergo unblocking reaction and release -NCO again at high temperatures.…”
Section: Introductionmentioning
confidence: 99%
“…Hexamethylene diisocyanate (HDI) trimers emulsions fall into category of active emulsions since they should have free isocyanate (-NCO) contents in the emulsion to react with non-woven fabrics and paper [1][2][3]. Since this reaction could convert the hydrogen bonding into chemical bonds between fibers [4], paper can become a new high-strength, water-resistant, oil-resistant special paper after the treatment.…”
Section: Introductionmentioning
confidence: 99%