Improvements in the physical properties of UV-curable coating by utilizing type II photoinitiator

Sanai, Yasuyuki; Ninomiya, Takeru; Arimitsu, Koji

doi:10.1016/j.porgcoat.2020.106038

Cited by 18 publications

(10 citation statements)

References 21 publications

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“…As commercial anticorrosive coatings are solvent-based coatings and release volatile organic compounds (VOCs), UV-curable coatings present many advantages, such as a high-speed cure, energy saving, and no VOCs emission [102][103][104][105]. However, the adhesion of UV-curable coatings to metal surfaces is limited, so UV-curable coatings need an underlying primer layer [106]. Acrylated tannic acid is a good bio-based adhesion promoter because it acts as a bridge between the steel surface and the coating (Figure 4, [79]) during the resin photo-crosslinking.…”

Section: Polyphenols As Adhesion Promoters/primers For Anticorrosion ...mentioning

confidence: 99%

Natural Polyphenols and the Corrosion Protection of Steel: Recent Advances and Future Perspectives for Green and Promising Strategies

Sesia

Spriano

Sangermano

et al. 2023

Metals

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Corrosion is recognized as an unavoidable phenomenon and steel, particularly carbon steel, is strongly susceptible to corrosion. Corrosion damages cause serious material, energy, and economic losses as well as negative impacts on the environment. As a result, research interest has been focused on the development of effective corrosion prevention strategies. However, some of the most commonly used corrosion inhibitors, such as chromates and pyridines, are harmful to human and environmental health. Polyphenols are natural, non-toxic, and biodegradable compounds from plant sources or agricultural by-products. Polyphenols’ chelating capacity has been acknowledged since the 1990s, and tannins, in particular, have been widely exploited as green rust converters in phosphoric acid-based formulations to recover rusty steel. Polyphenolic compounds have recently been investigated as a method of corrosion prevention. This review overviews not only the polyphenolic rust converters, but also the application of green anticorrosive coatings containing polyphenols. Moreover, polyphenols were discussed as an active component in corrosion-inhibiting primers to also promote strong adhesion between the steel surface and the topcoat layer. Finally, an overview of the use of polyphenolic additives in coatings as sustainable systems to improve corrosion resistance is provided.

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Section: Polyphenols As Adhesion Promoters/primers For Anticorrosion ...mentioning

confidence: 99%

Natural Polyphenols and the Corrosion Protection of Steel: Recent Advances and Future Perspectives for Green and Promising Strategies

Sesia

Spriano

Sangermano

et al. 2023

Metals

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“…Light‐curing technology refers to the process of changing materials from small molecules to polymers under the irradiation of light sources. Light‐curing technology has been widely used in inks, coatings, pressure‐sensitive adhesives, food packaging, dental resins, and biological materials fields due to energy saving, high efficiency, and almost no volatile organic compounds 1–10 . Typical light sources are medium and high‐pressure mercury lamps, which possesses some disadvantages including high energy consumption and environmental pollution, they would be replaced by ultraviolet‐light emitting diode (UV‐LED) 11–14 .…”

Section: Introductionmentioning

confidence: 99%

“…Light-curing technology has been widely used in inks, coatings, pressure-sensitive adhesives, food packaging, dental resins, and biological materials fields due to energy saving, high efficiency, and almost no volatile organic compounds. [1][2][3][4][5][6][7][8][9][10] Typical light sources are medium and high-pressure mercury lamps, which possesses some disadvantages including high energy consumption and environmental pollution, they would be replaced by ultraviolet-light emitting diode (UV-LED). [11][12][13][14] However, due to the narrow ultraviolet spectrum of UV-LED, including 365, 375, 385, 395, and 405 nm, UV-LED curing can only be concentrated in a relatively narrow range of the ultraviolet spectrum.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of acyldiphenylphosphine oxides photoinitiators carrying triphenylamine or pyrene group for free radical photopolymerization

Luo

2023

J of Applied Polymer Sci

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Two new photoinitiators of acyldiphenylphosphine oxides carrying triphenylamine (NHPO) or pyrene group (BHPO) were designed and synthesized with diphenylphosphine oxide reacting with 4‐(diphenylamino) benzaldehyde or 1‐pyrenecarboxaldehyde. The solubility of NHPO is about 13.7 wt% in TMPTA, which is higher than that of (2,4,6‐trimethylbenzoyl) diphenylphosphine oxide (TPO) (about 12.5 wt%). The UV–Vis spectrum of NHPO and BHPO revealed that their maximum absorption wavelengths have redshifted to 397 and 419 nm, respectively, with a molar extinction coefficient of around 19,057 and 24,257 M−1 cm−1, suggesting that they are likely to be effective photoinitiators when exposed to light from LEDs. According to real‐time Fourier transform infrared spectroscopies, the degree of double bond conversion of NHPO reached 65%, which was higher than that of TPO (about 45%), showing that NHPO had substantially better photoinitiated properties than TPO. Using steady‐state photolysis and electron spin resonance spin‐trapping studies, the photocuring mechanism was examined, and it was discovered that the NHPO and BHPO had produced two free radicals. Additionally, NHPO exhibited superior biocompatibility performance as demonstrated by cytotoxicity assays and had a low migration rate of only 0.23%, as determined by migration. As a result, NHPO might be utilized in coatings for food packaging.

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“…UV light induces photoinitiators to change from a ground state to a free radical or cationic transition state and promotes the conversion of monomers to polymers, completing the crosslinking curing behavior [30]. Its light absorption properties directly affect the structure of crosslinked polymers and the properties of cured coatings [31,32]. UV-curable coatings are an important development direction for wood coatings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Photoinitiators on Curing Performance of Wood Wax Oil Coating on Wood

Zhang,

Song

2023

Coatings

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With the increasing shortage of petroleum resources and the growing seriousness of environmental pollution, the exploitation and application of bio-based coatings derived from renewable resources have become increasingly important for the woodworking industry. Wood wax oil (WWO) is a new type of bio-based natural coating material that offers an eco-friendly solution for wood protection. This paper focused on the utilization of tung oil and beeswax as the primary raw materials for the preparation of wood wax oil. The WWO was based on the oxidation polymerization of tung oil, which served as the foundation for the preparation process. The effects of the photoinitiator TPO-L on the curing performance of the WWO were investigated, and the curing mechanism of the WWO system induced by photoinitiators was analyzed and characterized by infrared spectroscopy. Through ultraviolet irradiation experiments and coating quality tests, the effects of incremental photoinitiators on the properties of the surface drying time, gloss, color, hydrophobicity, and solution resistance of the treated ash wood were studied. The results indicated that the addition of photoinitiators was beneficial for the rapid polymerization of wood wax oil. A UV light intensity of 30 w was found to be sufficient to initiate the curing process. Specifically, when using TPO-L as the initiator at a concentration of 3 wt%, the surface could be surface-dried within 10 min under UV exposure. Under these curing conditions, wood wax oil coatings based on tung oil with comprehensive curing properties can be obtained. Additionally, adding 6% beeswax to the tung oil can effectively enhance the hydrophobicity of pure tung-oil-based wood protective coatings.

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Improvements in the physical properties of UV-curable coating by utilizing type II photoinitiator

Cited by 18 publications

References 21 publications

Natural Polyphenols and the Corrosion Protection of Steel: Recent Advances and Future Perspectives for Green and Promising Strategies

Natural Polyphenols and the Corrosion Protection of Steel: Recent Advances and Future Perspectives for Green and Promising Strategies

Synthesis and properties of acyldiphenylphosphine oxides photoinitiators carrying triphenylamine or pyrene group for free radical photopolymerization

Effects of Photoinitiators on Curing Performance of Wood Wax Oil Coating on Wood

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