UV-radiation curing of waterbased urethane–acrylate coatings

Masson, Frédéric; Decker, Christian; Jaworek, Thomas; Schwalm, Reinhold

doi:10.1016/s0300-9440(00)00128-4

Cited by 93 publications

(66 citation statements)

References 5 publications

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“…[23,[79][80][81][82][83][84] Most of them consist of a dispersion or emulsion of acrylate functionalized oligomers that can be photocrosslinked in the solid state after the removal of water. The advantages offered by these environmental friendly systems are partly offset by the required drying step that increase the overall processing time.…”

Section: Uv Curing Of Water-based Urethane/acrylate Coatingsmentioning

confidence: 99%

Kinetic Study and New Applications of UV Radiation Curing

Decker

2002

Macromol. Rapid Commun.

615

448

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Highly crosslinked polymers can be readily synthesized by photoinitiated polymerization of multifunctional monomers or functionalized polymers. The reaction can be followed in situ by real‐time infrared (RT‐IR) spectroscopy, a technique that records conversion versus time curves in photosensitive resins undergoing ultrafast polymerization upon UV exposure. For acrylate‐based resins, UV‐curing proceeds with long kinetic chains (7700 mol/radical) in spite of the high initiation rate. RT‐IR spectroscopy proved very valuable in assessing the influence of various parameters, such as initiation efficiency, chemical structure of the telechelic oligomer, light intensity, inhibitory effect of oxygen, on polymerization kinetics. Interpenetrating polymer networks can be rapidly synthesized by means of UV irradiation of a mixture of difunctional acrylate and epoxy monomers in the presence of both radical and cationic‐type photoinitiators. The same UV technology can be applied to crosslink solid polymers at ambient temperature, which bear different types of reactive groups (acrylate and vinyl double bonds, epoxy ring). UV radiation curing has been successfully used to produce within seconds weathering resistant protective coatings, high‐resolution relief images, glass laminates and nanocomposites materials.Photoinitiated crosslinking polymerization.magnified imagePhotoinitiated crosslinking polymerization.

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Section: Uv Curing Of Water-based Urethane/acrylate Coatingsmentioning

confidence: 99%

Kinetic Study and New Applications of UV Radiation Curing

Decker

2002

Macromol. Rapid Commun.

615

448

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“…To improve the cross-linking by UV radiation, an organic resin, photoinitiator or diluent/monomer is often added. [22][23][24][25][26][27][28][29][30][31] The same effect can be achieved by adding MAA and ZTP to a siloxane sol. 20,21,24,[31][32][33] Coatings cured by UV radiation at room temperature showed better resistance to corrosion of AA7075-T6 under simulated aircraft conditions (so called Harrison's solution) than coatings cured thermally, as shown in our previous study.…”

mentioning

confidence: 81%

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Rodič

Milošev

2015

J. Electrochem. Soc.

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Hybrid coatings based on Si and Zr were assessed for their protection of aluminum and its alloys 2024-T3 and 7075-T6 against corrosion in 0.5 M NaCl. Coatings were prepared from sol synthesized from mixtures of tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane to which various concentrations of zirconium tetrapropoxide and methacrylic acid were added. Short-and long-term electrochemical behavior was assessed. The degree of protection was dependent on the sol composition, ageing time and curing temperature. A coating containing Zr/Si ratio of 0.41, aged for 48 h and cured at 100 • C exhibited the best combination of resistance towards general and localized corrosion. Electrochemical parameters obtained under polarization (corrosion current density of 4.4 nA/cm 2 and stability up to 7 V), and under open circuit conditions (impedance in the few tens of Mohm cm 2 after one week immersion) prove that the protection was high. At other conditions, such as higher Zr/Si ratios, shorter ageing time or curing at room temperature, protection was excellent early after immersion but then lessened rapidly. Coatings prepared under optimal conditions provided a high degree of protection over 500 hours salt spray testing, especially on aluminum metal. These coatings have the potential to provide good protection in chloride environments. While aluminum has good corrosion resistance in seawater, its high-strength alloys in the 2xxx (Al-Cu-Mg) and 7xxx series (Al-ZnMg) are normally not recommended for use under these conditions. 1,2Since there is an ongoing need for light-weight, high-strength materials, the possibility of using alloys other than those of the series 5xxx (Al-Mg-Mn) and 6xxx (Al-Mg-Si) normally recommended for sea-coast applications has to be considered. 2,3Aluminum and its alloys are highly susceptible to oxidation, resulting in the passivation of the surface by a 0.01 to 10 μm thick oxide layer when exposed to air. This naturally formed oxide protects aluminum under atmospheric conditions.2 Passivation of the alloys is, however, less effective. Due to the presence of unevenly distributed intermetallic particles (IMPs), the passive film is, overall, thinner and less uniform. IMPs such as Al 2 CuMg, Al-Cu-Mn-Fe, Al 2 Cu, Al 3 Fe, MgSi 2 , MgZn 2 , create local galvanic cells that promote corrosion on the surface. [4][5][6] Al 2 O 3 is a good insulator but, when containing IMPs, is a semiconductor that allows limited passage of electrons.2 High concentrations of chloride ions allows localized breakdown of the aluminum oxide film, most commonly observed as pitting, crevice or galvanic corrosion.Al alloys have been protected for decades using chromate conversion coatings. In the last decade these coatings have been widely prohibited within 7 and outside 8 the EU due to the fact that hexavalent chromium is a toxic, carcinogenic and environmentally hazardous compound.9-11 Other environmentally hazardous compounds, such as volatile organic compounds (VOCs) used, for example, in the painting industry, have ...

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“…UA, and UA/N-PBAAP blends were then poured into a mold sized 25×25 mm 2 , and the thickness of the cured film is about 1 mm. Later the resin blends with 3 wt% Darocur 1173 were exposed to a UV irradiation equipment (80 mW·cm -2 , made by Lantian Co., China), which emits light in the near UV (characterized wavelength, 340~360 nm) in air atmosphere.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Undoubtedly, the degradation process is initiated by the decomposition of the urethane group at low temperature. This step probably leads to the formation of various polyamines, which decompose later, and the release of CO 2 , as shown by Equation (2). Then the ether structures of the soft segment degrade intensively, releasing large amount of low-molecule-weight combustible fragments.…”

Section: Thermal Degradation Mechanismmentioning

confidence: 99%

“…The radiation curing process has been found to be an effective alternative to solvent borne technology in the coating industry [1]. Radiation curing technology, mostly UV curing, offers many advantages during the curing process, in relation to the ecology or environment, energy conservation, economics and in the excellent performance of products [2][3][4]. The most commonly used UV-curable formulations involve unsaturated acrylic oligomers, including epoxy acrylates, polyester acrylates, polyether acrylates, urethane acrylates and silicone acrylates [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Thermal properties and flame retardancy of an ether-type UV-cured polyurethane coating

Chen¹,

Tai²,

Song³

et al. 2010

Express Polym. Lett.

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Abstract.A new UV-reactive monomer piperazine-N,N′-bis(acryloxyethylaryl-phosphoramidate) (N-PBAAP) containing phosphorus and nitrogen was synthesized and used as flame retardant for an ether-type UV-cured polyurethane acrylate (PUA) coating. The thermal properties of the PUA films were investigated by thermogravimetric analysis (TGA) in air and nitrogen atmosphere. The TGA results showed that the incorporation of N-PBAAP can obviously enhance the char residue of the PUA coatings. From the TGA and real time Fourier transformed infrared spectroscopy (RT-FTIR) results, different degradation behaviors were observed in the PUA coatings with different N-PBAAP content. The combustibility of the PUA coatings was evaluated by microscale combustion calorimeter (MCC). The MCC results revealed that the addition of N-PBAAP in the coatings can significantly reduce the peak Heat Release Rate (pHRR), Heat Release Capacity (HRC) and the Total Heat Release (THR) of the samples. Furthermore, dynamical mechanical thermal analysis (DMA) was employed to examine the viscoelastic properties of the PUA films. It was found that the incorporation of N-PBAAP in the formulation can bring in more functional groups to the coatings, which results in an increase of the glass transition temperature (Tg) and cross linking density (XLD) of the films.

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UV-radiation curing of waterbased urethane–acrylate coatings

Cited by 93 publications

References 5 publications

Kinetic Study and New Applications of UV Radiation Curing

Kinetic Study and New Applications of UV Radiation Curing

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Thermal properties and flame retardancy of an ether-type UV-cured polyurethane coating

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