New effects of fumed silica in modern coatings

Leder, Gabriele; Ladwig, T.; Valter, Vlasta; Frahn, Stephanie; Meyer, Jürgen G.

doi:10.1016/s0300-9440(02)00049-8

Cited by 67 publications

(29 citation statements)

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“…Results with regard to the positive effect of nanoparticles on scratch resistance are consistent with observations reported in literature especially in nanosilica case. 27,28 Adhesion Figure 9 shows results of adhesion strength of dried/ UV-cured waterborne nanocomposite coatings as a function of nanoparticle content. The neat coating shows adhesion strength of 6.4 ± 0.4 MPa.…”

Section: Scratch Resistancementioning

confidence: 99%

UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment

2010

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The effect of alumina and silica nanoparticles on mechanical, optical, and thermal properties of UV-waterborne nanocomposite coatings was investigated. The addition of nanoalumina and nanosilica was shown to decrease the hardness because of nanoparticle aggregation. In comparison to the neat coating and despite the presence of aggregates, the scratch resistance of nanocomposite coatings was significantly improved. As expected, the gloss of UV-waterborne coatings was reduced following the addition of nanoparticles due to an increase of the surface roughness. Alumina and silica nanoparticles were found to enhance the glass transition temperature of PUA nanocomposite coatings by hindering the mobility of macromolecular chains at the interface around the nanoparticles. Finally, the interest and efficiency of grafting trialkoxysilanes was demonstrated with the study of nanosilica behavior. Not only was the dispersion of nanosilica enhanced following trialkoxysilanes grafting onto silica nanoparticles, but also the scratch resistance and the adhesion of UV-waterborne coatings containing nanosilica markedly increased even with 1 wt% content. Silica which is recommended in the wooden furniture and kitchen cabinet manufacturing industry as nano-reinforcement provides improved properties well suited in surface coating applications to efficiently protect surface of wood substrates.

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Section: Scratch Resistancementioning

confidence: 99%

UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment

2010

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“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions INTRODUCTION In the past decade, nanosilica particles have been widely introduced into polymers to improve the heat resistance, radiation resistance, and mechanical and electrical properties of the polymer materials [1][2][3][4] . For example, Zhou et al [5] found that nanosilica particles could more effectively improve the hardness, abrasion resistance, and scratch resistance of acrylic-based polyurethane coats than microsilica particles.…”

Section: Preparation and Performance Of Waterborne Polyurethane/nanosmentioning

confidence: 99%

Preparation and Performance of Waterborne Polyurethane/Nanosilica Hybrid Materials

Lai

Shen

Wang

et al. 2011

Polymer-Plastics Technology and Engineering

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The polyurethane prepolymer was synthesized, and hydrophilic nano-sized silica (A200) was added to the prepolymer with KH550 as a coupling agent, then a waterborne polyurethane/nanosilica hybrid material (WPUNS) was obtained by a sol-gel process. The structure and performance of the WPUNS films were studied by FTIR, TG, DSC and physical mechanical testing. The particle size and distribution of WPUNS hybrid emulsion was analyzed by a dynamic light scatter (DLS). The morphology of emulsion and films were observed by Transmission Electron Microscope (TEM) and Atomic Force Microscope (AFM), respectively. FTIR analysis indicates the formation of chemical bond between WPU and A200. TEM images display that A200 particles were encapsulated by PU macromolecules and formed a composite particles structure. As the mass fraction of A200 increased from 0 to 2%, the particle size increased from 79.9 nm to 139.9 nm, the tensile strength of the films increased from 6.32 MPa to 20.46 MPa, water absorption decreased from 28.3% to 6.3%, and the hardness was also improved. The TG result indicates that A200 can improve thermal stability of WPUNS. DSC shows that there is no clear effect of nanosilica on the glass transition of soft segments. AFM displays that the smoothness of the films increases with A200 addition.

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“…Owing to nanotechnology, researchers developed a number of new, specialist, socalled smart coatings which are produced by using nanoSiO 2 . In case of liquid systems, the universal use of SiO 2 as a filler results from its strong condensing properties, which enhance the utilitarian value of paints, lacquers and adhesives (Leder et al 2002;Carneiro et al 2012;Moon et al 2013). The spatial structure of silica protects the system from draining and improves the spreading and smoothness of coating.…”

Section: Introductionmentioning

confidence: 99%

Fumed silica as a filler for MUPF resin in the process of manufacturing water-resistant plywood

Dukarska

Czarnecki

2015

Eur. J. Wood Prod.

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This work examines the effect of applying fumed silica with nanoscopic-size particles as a filling material for melamine-urea-phenol-formaldehyde (MUPF) resin in the process of manufacturing water-resistant plywood. Moreover, this paper investigates the possibility of reducing the amount of MUPF resin mixture used in the process of gluing veneer sheets. Based on the investigations into the reactivity, viscosity and durability of MUPF resin mixture containing various amounts of nanofiller, it was found that the optimum amount of silica that can make the resin suitable for gluing sheets of veneer amounts to 2 PBW per 100 PBW of MUPF resin. The gluing properties for thus mixed resin were determined by measuring the contact angle and determining the parameters of its derivatives, which are an additional criterion for evaluating the gluing properties. The thermal stability was tested with simultaneous use of TG-DSC analysis. The experimental plywood manufactured using optimal nano-SiO 2 was tested in terms of bond quality and mechanical properties according to appropriate standards. The investigations prove that it is possible to apply fumed silica as a filling material for the resin in the process of manufacturing water-resistant plywood. Introducing the above-mentioned amount of fumed silica into the resin makes it possible to increase the activation energy of the cross-linking process of MUPF resin and to optimize the process of gluing the sheets of veneer. Moreover, it is also possible to produce plywood of the required water-resistance with the amount of adhesive mixture reduced by 30 %.

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New effects of fumed silica in modern coatings

Cited by 67 publications

References 0 publications

UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment

UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment

Preparation and Performance of Waterborne Polyurethane/Nanosilica Hybrid Materials

Fumed silica as a filler for MUPF resin in the process of manufacturing water-resistant plywood

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