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The effect of novel light stabilisers enhance UV filtering in waterborne UV-curable coatings / Yung-Chi Yang in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4649 (03/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4649 (03/2019) . - p. 22-29 Titre : The effect of novel light stabilisers enhance UV filtering in waterborne UV-curable coatings Type de document : texte imprimé Auteurs : Yung-Chi Yang, Auteur ; Pei-Yun Lee, Auteur ; Miles Hsieh, Auteur ; Yin-Ting Lai, Auteur ; Chung-Han Lu, Auteur ; Yao-Hsing Huang, Auteur Année de publication : 2019 Article en page(s) : p. 22-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Filtration Photodétérioration Plan d'expérience Rayonnement ultraviolet Revêtements en phase aqueuse -- Additifs Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet Stabilisants à la lumière Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne ultra violet (UV)-curable coatings have been developed to replace conventional UV-curable coatings to lower VOC content. Due to fast-drying and short processing time, UV-curable coatings are widely used in various industries. However, there are two major challenges : The first one is discolouration after long-term exposure to sunlight ; the other is to keep the ability of UV filtering, since waterborne UV-curable coatings are usually applied to the surface as a protective top coat. The novel light stabiliser (NLS) has been developed specifically for waterborne UV-curable coatings. Design of Experiment (DOE) was used in the study. Test data showed that the designed NLS would not interfere with the curing speed of the tested clear waterborne UV-curable coating system. Moreover, the results confirmed that increasing the concentration of NLS could enhance the UV filtering ability and weatherability of the tested clear top coat more effectively than by increasing the coating thickness : At 365nm wavelength, the effect factor of NLS is 62.5%, while DFT (dry film thickness) is 20.9% ; at 380nm, the effect factor of NLS is 47.7%, while DFT is only 27.4%. The test results confirmed the designed NLS could block the UV light without compromising the UV-curing speed and is suitable for enhancing the weatherability and protection ability of the clear waterborne UV-curable coatings. Note de contenu : - EXPERIMENT : Materials - Equipment - Methods - RESULTS AND DISCUSSION : Screening design - Effects of waterborne UV absorber - effects of waterborne HALS - Effects of film thickness - Effects of novel light stabilisers (NLS) - Evaluation of optimised situation - Effects of NLS and film thickness on 365 nm UV filtering - Effects on NLS and film thickness on 380nm UV filtering - Effects of NLS and film thickness on yellowing - The optimal prediction profiler - Response surface methodology (RSM) - Table 1 : Compositions of waterborne UV model formulation - Table 2 : Classification of light stabilisers - Table 3 : Details of screening design and test results (R2 = 0.99, Radj2 = 0.97, RMSE = 0.008) - Table 4 : Parameter estimates (R2 = 0.99, Radj2 = 0.97, RMSE = 0.008) - Table 5 : Analyse of variance (ANOVA) - Table 6 : Evaluation of optimal results - Table 7 : Analysis of variance (anova) (R2 = 0.92, Radj2 = 0.88, RMSE = 10.26) - Table 8 : Parameter estimates - Table 9 : Analysis of variance (ANOVA) (R2 = 0.91, Radj2 = 0.88, RMSE = 9.98) - Table 10 : Parameter estimates - Table 11 : Analysis of variance (ANOVA) (R2 = 0.96, Radjw = 0.94, RMSE = 0.75) - Table 12 : Parameter estimates - Fig. 1 : The effect of curing energy with waterborne UVA, HALS and NLS in waterborne UV curable model formulation - Fig. 2 : Effect of NLS and film thickness at 365nm wavelength in waterborne UV curable model formulation - Fig. 3 : Effects of NLS and film thickness at 380nm wavelength in waterborne UV curable model formulation - Fig. 4 : Effects of NLS and film thickness to yellowing reduction in waterborne curable model formulation - Fig. 5 : Effects of NLS and DFT at 365nm, 380nm and reduced yellowing after weathering for 120hr (Optimal Prediction Profiler) - Fig. 6 : Response surface methodology (NLS vs DFT vs 365nm) - Fig. 7 : Response surface methodology (NLS vs DFT vs 380nm) - Fig. 8 : Response surface methodology (NLS vs DFT vs Ml En ligne : https://drive.google.com/file/d/172I5El11SpHSoUa6i6KuCXyqiQqNds17/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32120 [article]

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Improved chemical resistance of waterborne industrial acrylics / Gun Lundsten in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4649 (03/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4649 (03/2019) . - p. 30-32 Titre : Improved chemical resistance of waterborne industrial acrylics Type de document : texte imprimé Auteurs : Gun Lundsten, Auteur Année de publication : 2019 Article en page(s) : p. 30-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Essais (technologie) Formulation (Génie chimique) Hydrophobie Liants en phase aqueuse Mouillage (chimie des surfaces) Polyacryliques Résistance aux taches Revêtements en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : The author reports on a study into the improvement of the chemical resistance of waterborne binders, while maintaining excellent early block resistance. Industrial coatings are used for several areas like furniture, kitchen cabinets and building products. The requirements of the coatings are dependant on the application but stackability or early block resistance and good chemical resistance are usually desirable. Traditionally this was achieved by using reactive two-component chemistries, often solventborne. Nowadays there are one component waterborne self-crosslinking acrylics with excellent stackability properties on the market. But improved chemical resistance and especially coffee and red wine resistance are still desirable. In this investigation, the improvement of the chemical resistance of waterborne binders has been studied, while maintaining the excellent early block resistance. Note de contenu : - Factors influencing stain resistance - Experimental approach - Test procedures - Test results - Fig. 1 : Wetting of surfaces by a hydrophilic liquid - Table 1 : Values of hydrophobicity of some acrylic monomers - Table 2 : Formulation of test paint used, PVC 26 - Table 3 : Rating of sticking tendency - Table 4 : Properties of the tested binders and paints En ligne : https://drive.google.com/file/d/1bwJFPeKjodkTnZONW9dl_rjOxRzpQWs6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32121 [article]

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Synthesis and characterisation of silicone polyacrylate latex emulsified by green surfactants / Yilu Gong in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4649 (03/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4649 (03/2019) . - p. 33-36 Titre : Synthesis and characterisation of silicone polyacrylate latex emulsified by green surfactants Type de document : texte imprimé Auteurs : Yilu Gong, Auteur ; Tantan Shao, Auteur ; Xin Zhang, Auteur ; Dawei Chen, Auteur ; Lijun Chen, Auteur Année de publication : 2019 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Biosurfactants Caractérisation Copolymère silicone acrylate Copolymères -- Synthèse Emulsifiants Humidité -- Absorption:Eau -- Absorption Latex Monomères Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The modified latex was successfully prepared by semi-continuous seeded emulsion polymerisation with a green mixed emulsifier of polyether nonions with double bonds (AE-100) and alkyl alcohol polyether sodium sulphate anionic emulsifier (ES-430S). The mixed monomers of MMA, BA and vinyl triethoxysilane (VETS) were initiated with potassium persulphate (KPS). The structure and properties of the resultant latex were characterised by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) differential scanning calorimetry (DSC) and contact angle (CA). The conditions for preparing the latex were instigated in detail. Results indicate that the optimal conditions of preparing the latex are as follows: the amount of mixed emulsifiers is 6.0% ; the optimum mass ratio of AE-100 to ES-4305 is 1:1.5 ; the amount of initiator is 0.7% ; the mass rate of main monomers of MMA: BA =1:1 and amount of VIES is 6.0%. In addition, the resultant latex shows good thermal stability and hydrophobicity. Note de contenu : - EXPERIMENT : Materials - Preparation of modified latex - Characterisation - RESULTS AND DISCUSSION : FTIR and DSC of films - Influence of mass ratio of monomer on properties of latex - Effect of amount of emlusifier and mass ratio on properties of latex - Water absorption and contact angle - Fig. 1 : Synthetic pathway of preparing modified latex - Fig. 2 : FTIR of latex film - Fig. 3 : DSC of film - Fig. 4 : Effect of different mass ratios of emulsifier on conversion percentage (A) and coagulation percentage (B) - Fig. 5 : Influence of amount of VTES on contact angle (B) and water absorption (C) - Fig. 6 : Contact angles of film la 77.6°, conventional latex film ; b 89.6°, modified latex film) - Fig. 7 : TGA of latex film (a : conventional latex film ; b : modified latex film) - Table 1 : Recipe of preparing modified latex - Table 2 : The effect of the amount of emulsifiers on average particle size - Table 3 : Influence of mass radio of monomer on properties of lates - Table 4 : Influence of amount of emulsifier on properties of latex En ligne : https://drive.google.com/file/d/1YrbMdfoE1Li2zajO9lRzKpc2h_ehnrTQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32122 [article]

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Polymer Paint Colour Journal - PPCJ Vol. 209, N° 4649 URL