Effect of the particle sizes of silica on the properties of UV-curing matting coatings

Yang, Ziyuan; Wu, Jianbing; Ma, Guozhang; Hou, Chao; Niu, Yulan; Duan, Huafeng; Hao, Xiaogang

doi:10.1007/s11998-020-00395-4

Cited by 18 publications

(12 citation statements)

References 23 publications

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“…After UV irradiation, there is a new absorption peak that appeared at 1631 cm −1 , not the peak of C C vibrations that appeared at 1634 cm −1 shifted to 1631 cm −1 , which was caused by the residual moisture in the cured coating films. The absorption bands at 3437 and 1631 cm −1 are ascribed to the O–H vibrations 38 of the residual moisture. The characteristic peaks at 2955 and 2870 cm −1 (WPUA oligomer and liquid coating) or 2924 and 2869 cm −1 (cured coating film) are assigned to the C–H stretching vibration in CH 2 and CH 3 , while the peak at 1458 cm −1 is attributed to the C–H deformation vibration in CH 2 and CH 3 .…”

Section: Resultsmentioning

confidence: 99%

UV-curable self-matting waterborne polyurethane acrylate coatingviaself-wrinkled surface during curing in open-air

Zhang

2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

UV-curable self-matting waterborne polyurethane acrylate coatingviaself-wrinkled surface during curing in open-air

Zhang

2022

RSC Adv.

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“…The conversion seemed to relate to the average particle size of the mica powders since it was increased when the particle size of mica powders was reduced. There are two possible reasons for this [13,35,39,44]: one is that the coatings with smaller particle size fillers have better fluidity, and the resistance to chain growth in the reaction was less; the other is that mica can also absorb ultraviolet light, and it can be reasonably speculated that the crystal structures of mica were destroyed in the process of particle size reduction, which weakened the ultraviolet absorption ability of mica [19] and changed the conversion rate of the C=C bond. The shielding effect of mica to ultraviolet light is mainly related to two factors, including the polarized light effect of crystal and the interlayer reflection and interference-effect.…”

Section: Morphologies Of Coatingsmentioning

confidence: 99%

“…Wang et al [12] synthesized fast-curing ultraviolet light emitting diode (UV-LED) polymer materials with different particle size talcum powder, and the results showed that materials filled with smaller size talcum powder showed superior surface/mechanical performance. Yang et al [13] prepared UV curable matting composites using different particle size micron silica matting agents. The study showed that smaller particle size related to lower gloss and stronger hydrophobicity of coatings with the same content.…”

Section: Introductionmentioning

confidence: 99%

Studying the Influence of Mica Particle Size on the Properties of Epoxy Acrylate/Mica Composite Coatings through Reducing Mica Particle Size by the Ball-Milled Method

Liu

Gao

et al. 2022

Coatings

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In this work, a series of epoxy acrylate (EA)/mica composite coatings were synthesized through introducing mica powders of different particle size into epoxy acrylate coatings and using an ultraviolet (UV) curing technique to investigate the influence of mica particle size on the coatings. Mica powders of different particle sizes were obtained by ball-milling for 4, 8, 12, 16, and 20 h with a planetary high-energy ball mill. The particle size and morphologies of ball-milled mica powders were characterized by laser particle size analyzer and scanning electron microscopy (SEM). The results indicated that planetary ball-milling reduced the particle size of mica powders effectively. Mica powders that were un-ball-milled and ball-milled were added into the epoxy acrylate matrix by a blending method to synthesize the organic-inorganic UV curable coatings. The optical photographs of the coatings showed greater stability of liquid mixtures with smaller particle size fillers. The chemical structures of EA/mica composite coatings were investigated by Fourier transform infrared spectroscopy (FTIR), and the conversion rate of C=C bonds was calculated. The results indicated that the C=C conversion of coatings with mica powders of smaller particle sizes was higher. Tests of mechanical properties and tests using electrochemical impedance spectroscopy (EIS) showed that pencil hardness, impact resistance, and coating resistance were improved due to the reduction of mica powders particle size.

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“…The filler used in this case study is silica. Silica is widely used in UV-curable adhesives to promote abrasion resistance, thermal stability, surface hardness, and other physical properties. , The refractive index of the silica filler is 1.46 . The filler size and volume fraction used in this case study are 400 nm and 20%, respectively.…”

Section: Case Studymentioning

confidence: 99%

Coupling Monte Carlo Light Propagation Method and Curing Kinetic Equations to Model the Degree of Conversion Evolution of UV-Curable Composites

Xie

Basu

DeMeter

2021

Ind. Eng. Chem. Res.

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The degree of conversion (DoC) is significantly linked with many material properties of a UV-cured resin. Current curing kinetic models provide insight into how DoC evolves with depth for a pure resin cured by the collimated light beam. However, they do not accurately describe how DoC evolves within UV-curable composites or systems in which multidirectional ray propagation is in play. This paper describes a simulation framework for predicting the spatial and temporal evolution of DoC within a UV-curable composite. The framework uses the Monte Carlo method to predict light propagation and absorbed energy density at different reaction time steps. It also uses curing kinetic models and optical property models to predict DoC and optical properties within a volume. The framework was applied to simulate the photoinduced, free-radical polymerization of poly(ethylene glycol) diacrylate/phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide-based composites. It was used to study the influence of filler volume fraction and filler particle on the curing depth and curing width. The results show that larger filler volume fraction or smaller filler leads to smaller curing depth and width, which is in qualitative agreement with experimental results published in the research literature. The framework was also applied to simulate the formation of adhesive joints in a photoactivated adhesive workholding fixture application. The influence of a light source, a filler, and a workpiece surface on the final DoC distribution was investigated. The results show that (1) both the beam spread from a light-emitting diode (LED) light and the usage of a filler have large influences on the curing width of an adhesive joint. However, such influences will not be aggregated. (2) The light scattering by the fillers leads to a higher DoC in the secondary curing zone at shallow depth ranges, while the beam spread of the LED light beam results in a higher DoC in the secondary curing zone at deep depth ranges. (3) If the adhesive is not thick, then a highly reflective workpiece surface can promote the DoC at deep depth ranges. (4) Inside the primary curing zone, diffuse reflection caused by the workpiece surface greatly promotes the polymerization rate near the workpiece surface.

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Effect of the particle sizes of silica on the properties of UV-curing matting coatings

Cited by 18 publications

References 23 publications

UV-curable self-matting waterborne polyurethane acrylate coatingviaself-wrinkled surface during curing in open-air

UV-curable self-matting waterborne polyurethane acrylate coatingviaself-wrinkled surface during curing in open-air

Studying the Influence of Mica Particle Size on the Properties of Epoxy Acrylate/Mica Composite Coatings through Reducing Mica Particle Size by the Ball-Milled Method

Coupling Monte Carlo Light Propagation Method and Curing Kinetic Equations to Model the Degree of Conversion Evolution of UV-Curable Composites

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