Studies on low temperature curable powder coatings

Witzeman, J. S.

doi:10.1016/0300-9440(95)00543-9

Cited by 29 publications

(12 citation statements)

References 10 publications

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“…This situation occurs for instance in the case of blocked isocyanate reacting with an amine. The reaction is described by an overall first-order reaction, zero-order in amine and first-order in blocked isocyanate (for instance, between an oxime blocked isocyanate and an amine, see ref ).…”

Section: Model Reversible Urea/urethane Bonds: the Case Of Blocked Is...mentioning

confidence: 99%

“…In practical applications, it is however possible to generate a “deblocking temperature” according to the onset temperature of dissociation. As an example, different oxime- and caprolactam-blocked isocyanates were heated in toluene in the presence of amine (1.2–6 equiv relative to blocked isocyanate; Scheme ), and aliquots were analyzed by gas chromatography to record the rate of appearance of urea …”

Section: Model Reversible Urea/urethane Bonds: the Case Of Blocked Is...mentioning

confidence: 99%

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On the Versatility of Urethane/Urea Bonds: Reversibility, Blocked Isocyanate, and Non-isocyanate Polyurethane

et al. 2012

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Section: Model Reversible Urea/urethane Bonds: the Case Of Blocked Is...mentioning

confidence: 99%

Section: Model Reversible Urea/urethane Bonds: the Case Of Blocked Is...mentioning

confidence: 99%

On the Versatility of Urethane/Urea Bonds: Reversibility, Blocked Isocyanate, and Non-isocyanate Polyurethane

et al. 2012

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“…Hydrophobic substituent is usually incorporated into polyisocyanates to increase the stability of WDPs . On the basis of the optimal formula such as DMBA/MPEG = 3:7 and NCO % = 19.0%, CHDM was introduced into WDPs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of novel water‐dispersible polyisocyanates

Wang

Huang

et al. 2017

J of Applied Polymer Sci

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A series of novel water‐dispersible polyisocyanates (WDPs) were synthesized with hexamethylene diisocyanate isoxyanurates (HDI trimer), dimethylol butanoic acid (DMBA), polyethylene glycol monomethyl ether (MPEG‐600) and 1,4‐cyclohexanedimethanol (CHDM) as materials. Two‐component waterborne polyurethane (2K‐WPU) films based on WDPs were prepared and characterized by ultraviolet‐visible spectrophotometer, thermogravimetric analyzer (TGA), scanning electron microscopy (SEM), and surface contact angle measurement. The effects of molar ratios of DMBA/MPEG and CHDM/MPEG and their amounts on properties of WDPs including the water dispersibility, storage stability, films hardness, and water resistance were also investigated. The results showed that the introduction of CHDM could efficiently improve the storage stability, the hardness and water resistance of 2K‐WPU films due to the rigid cyclic structure and hydrophobicity property of CHDM. It was found that WDPs had excellent storage stability, and the 2K‐WPU displayed short tack‐free times, high hardness, good water resistance, excellent surface appearance and gloss with 3:7:3 of the molar ratio of DMBA/MPEG/CHDM. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44735.

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“…However, some systems have been described in the literature, e.g., systems that cure at temperatures starting at 130°C that are based on blocked isocyanates. 1 Low-temperature curable coatings require an initiator that is activated at the curing temperature but stable at storage temperature, 2 which is difficult to achieve using conventional thermal initiators as we have already explained. At this point UV curing offers a possible solution to this problem since it allows separation of the melting and the film formation stage from the curing stage.…”

Section: Introductionmentioning

confidence: 98%

Kinetic studies of a UV-curable powder coating using photo-DSC, real-time FTIR and rheology

2007

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The curing kinetics of UV-curable powder coatings based on commercial unsaturated polyesters were monitored using photo-DSC, Real-Time FTIR-ATR and a modified rheometer equipped with a UV source. The effect of physical and chemical factors on curing such as type of photoinitiator, photoinitiator concentration, temperature and atmosphere of curing were evaluated. Coatings containing amounts of photoinitiator from 0.5 to 10 wt% were cured at different temperatures in less than 10 s reaching conversions approximately of 60%. The increase of the temperature of curing reduces the final conversion and also the rate of polymerization due to the chain transfer process and depolymerization that dominates the photopolymerization at high temperatures. The reactivity of the photoinitiators was similar for all the studied photoinitiators apart from benzophenone that was found to be the slowest initiator.

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Studies on low temperature curable powder coatings

Cited by 29 publications

References 10 publications

On the Versatility of Urethane/Urea Bonds: Reversibility, Blocked Isocyanate, and Non-isocyanate Polyurethane

On the Versatility of Urethane/Urea Bonds: Reversibility, Blocked Isocyanate, and Non-isocyanate Polyurethane

Synthesis and properties of novel water‐dispersible polyisocyanates

Kinetic studies of a UV-curable powder coating using photo-DSC, real-time FTIR and rheology

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