Development of waterborne UV-A curable clear coat for car refinishes

Berg, Keimpe J. van den; Ven, L.G.J. van der; Haak, H.J.W. van den

doi:10.1016/j.porgcoat.2007.09.037

Cited by 31 publications

(11 citation statements)

References 5 publications

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“…8A . To determine the properties of these novel bio-based materials, we subjected the coatings to standardized spot tests to reveal the resistances against water and solvent ( 43 , 44 ). The Persoz hardness test was used to establish the hardness, and the glass transition temperatures and cross-link densities were measured by dynamic mechanical thermal analysis (DMTA).…”

Section: Resultsmentioning

confidence: 99%

A coating from nature

et al. 2020

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For almost a century, petrochemical-based monomers like acrylates have been widely used as the basis for coatings, resins, and paints. The development of sustainable alternatives, integrating the principles of green chemistry in starting material, synthesis process, and product function, offers tremendous challenges for science and society. Here, we report on alkoxybutenolides as a bio-based alternative for acrylates and the formation of high-performance coatings. Starting from biomass-derived furfural and an environmentally benign photochemical conversion using visible light and oxygen in a flow reactor provides the alkoxybutenolide monomers. This is followed by radical (co)polymerization, which results in coatings with tunable properties for applications on distinct surfaces like glass or plastic. The performance is comparable to current petrochemical-derived industrial coatings.

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Section: Resultsmentioning

confidence: 99%

A coating from nature

et al. 2020

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“…In WPU dispersions, it is possible to obtain the ideal viscosity for the application, because the viscosity of dispersions is generally independent of the molecular weight of the polymer, it will depend on the particles size and the amount of solids present in the dispersion [126,127,167]. The rheological behavior of WPU dispersions belongs to pseudoplastic fluids [11,82,92,130,145].…”

Section: Dispersion Processmentioning

confidence: 99%

UV-curable waterborne polyurethane coatings: A state-of-the-art and recent advances review

Agnol

Dias

Ornaghi

et al. 2021

Progress in Organic Coatings

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Waterborne polyurethane coatings prepared by UV-induced photoreactions (UV-WPU) are becoming very attractive due to the increasingly stringent environmental demands. They were developed to replace solventbased polyurethanes in the coatings of wood, paper, plastics, metal, and glass, mainly because of their good physicochemical, rheological, and optical properties. Several UV-WPU formulations have been tested over the years, making their research substantial. However, no valuable review of this literature, focusing on the significant influencing factors in UV-WPU's manufacture, is available to date. This work aims to answer specific questions about the state of these materials' art, such as: "which monomers have been used most in UV-WPU synthesis?", "what type of photo-initiator has promoted the most efficient curing of the material?", "what additives or particles have been tested for composite UV-WPUs?", "which applications have UV-WPUs been directed to?", "what adaptations and technologies have already been tested to overcome the challenges of the process?", among others. As a result of a systematized bibliographic search in four databases, considering the period from January 2000 to July 2020, a total of one hundred and thirty-eight distinct and relevant articles on UV-WPUs were found. From this study, we hope to present a scientific source on the current state-of-the-art of UV-WPU synthesis, providing new combinations of raw materials and intelligent solutions, thus making material and industrial engineers able to mitigate the inconveniences of the process.

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“…As expected, when increasing the grafting percentage (from MAH/AGE = 15/23 to 67/81), the glass transition temperature increases (from 75 to 140 °C), because the network was more compact, with a higher crosslinking density. In comparison, in the case of most UV waterborne coatings (polyurethanes), the observed glass transition temperatures can reach 70 °C to 100 °C …”

Section: Resultsmentioning

confidence: 98%

“…Poly-L-lysine (2 g, 2.9 mmol) and allyl glycidyl ether (1.8 g, 15.6 mmol) and 90 mL of methanol were added in a 250 mL round-bottom flask equipped with a magnetic stirrer bar and left under stirring at room temperature at different reaction times (23,48, 72 h). Also, different ratios allyl glycidyl ether/PLL were tested to study their influence on the grafting rate (AGE/PLL 5 1.2, 2.4, 3.7, 4.8, 6.2) with a reaction time of 48 h. The methanol was then concentrated under vacuum; the dried residue was solubilized in a small volume of methanol, and precipitated in a large volume of ethyl acetate, filtered off (this step was performed twice), and dried under vacuum.…”

Section: Synthesis Of Allyl Grafted Poly-l-lysine (Pll-g-ae)mentioning

confidence: 99%

“…As expected, when increasing the grafting percentage (from MAH/AGE 5 15/23 to 67/81), the glass transition temperature increases (from 75 to 140 C), because the network was more compact, with a higher crosslinking density. In comparison, in the case of most UV waterborne coatings (polyurethanes), the observed glass transition temperatures can reach 70 C to 100 C. 40,41,43,[45][46][47][48][49] To conclude, these analyses show that grafting percentage strongly influences the thermal properties of these poly(aminoacid) based materials.…”

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Syntheses of donor acceptor biobased photocurable water‐soluble resins based on poly‐l‐lysine

Koleilat

Giani

Joly‐Duhamel

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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We report a new kind of coating using UV waterborne technique with a biobased poly(amino acid) resin. Firstly we performed the thermal polycondensation of L-lysine during 15 h at 150 C to synthesize water-soluble oligomers of poly-Llysine (PLL) with 5-6 monomer units. These oligomers were then transformed in mild conditions to give photocurable water-soluble resins. We grafted on the poly-L-lysine backbone, allyl and maleamic acid functional groups, with a grafting rate close to 65% thanks to allyl glycidyl ether and maleic anhydride respectively. The influence of the reaction time and the reagents ratio on the grafting rate was investigated. Hence, the donor/acceptor photopolymerization of the mixture of allyl ether-poly-L-lysine (PLL-g-AE) with maleamic acid-poly-L-lysine (PLL-g-MA) in aqueous solution gave yellow transparent films.The degree of conversion and other kinetic parameters have been studied and detailed. This work contributes to the development of materials based on renewable resources and cleaner processes. It opens a new pathway to both fundamental and applied-driven research.

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Development of waterborne UV-A curable clear coat for car refinishes

Cited by 31 publications

References 5 publications

A coating from nature

A coating from nature

UV-curable waterborne polyurethane coatings: A state-of-the-art and recent advances review

Syntheses of donor acceptor biobased photocurable water‐soluble resins based on poly‐l‐lysine

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