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The study of enhancing durability of thermochromic coatings by novel light stabilisers / Chieh-Hsiu Hsieh in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4660 (04/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4660 (04/2020) . - p. 16-19 Titre : The study of enhancing durability of thermochromic coatings by novel light stabilisers Type de document : texte imprimé Auteurs : Chieh-Hsiu Hsieh, Auteur ; Pei-Yun Lee, Auteur Année de publication : 2020 Article en page(s) : p. 16-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet 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) Décoloration Essais accélérés (technologie) Plan d'expérience Résistance aux conditions climatiques Revêtements organiques Stabilisants à la lumière Thermochromie Index. décimale : 667.9 Revêtements et enduits Résumé : Thermochromic coatings are special effect coatings that change colour when the temperature changes. The colour changing function contributes to its most important benefit: bringing additional functions to routine items, such as a temperature indicating feature, food quality indicator, or authenticity verification. However, thermochromic coatings are usually sensitive to UV light or in-room light exposure. UV light would damage the thermochromic compounds and ruin the colour changing ability and hence, limit its application range. To expand the application of thermochromic coatings, solving the UV-sensitive issue is necessary. The purpose of this study was to find suitable solutions to solve the fading problems of thermochromic coatings. Design of Experiment (DOE) method and statistical software were used to analyse the correlation of light stabiliser dosage and dry film thickness (DFT) after the QUV¬accelerated weathering test. According to the calculated results, the influence level of a novel light stabiliser (NLS) on colour difference value is 69%, while the influence level of DFT is 20%. Furthermore, we tested the protective effect of different dosages of NLS on the colour changing ability for thermochromic coatings after 72hr QUV exposure. According to our results, 3% and 5% of NLS both provide excellent protection and help the thermochromic coating to maintain its colour changing function after UV light exposure. / mAT Note de contenu : - EXPERIMENT : Materials - Equipment - Methods - QUV accelerated weathering test - High temperature optical data test method - RESULTS AND DISCUSSION : part I : Analyse the influence of light stabiliser and film thickness on the anti-discolouration protection of thermochromic coatings and establish the prediction model - Part II : Analyse the colour changing function of the thermochromic coating after QUV exposure - Table 1 : The colour difference values(AE) with different NLS dosage and different DFT after QUV accelerated weathering tester for 72hr - Table 2 : ANOVA table of NLS and DFT - Table 3 : Parameter estimation table - Table 4 : The colour difference values of the tested panel moving from room temperature into high temperature and the thermochromic ability retention rate - Fig. 1 : The Linear relationship between the measured value and the predicted value showed that the model had good explanatory with the R Square Adj value as high as 0.897 - Fig. 2 : The Goodness-of-Fit test showed the experimental data was a normal distribution. Note: Ho = The data is from the Normal distribution. Small p-values reject Ho - Fig. 3 : The appearance of samples for thermochromic coatings with different dosages of NLS and DFT after QUV accelerated weathering test for 72hr - Fig. 4 : The contour maps of NLS, DFT, and AE were plotted. The white area shows the condition of predicted AE values lower than 10 En ligne : https://drive.google.com/file/d/1zj695g8TY9NuGaLvS7nPxWq_6cEtxaTI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34030 [article]

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To make ultra-black materials that won't weigh things down, consider the butterfly in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4660 (04/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4660 (04/2020) . - p. 22-23 Titre : To make ultra-black materials that won't weigh things down, consider the butterfly Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 22-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie biomimétique Matériaux intelligents Noir (couleur) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The authors have been studying why some butterflies have ultra-black wings that rival the blackest materials made by humans, using wing scales that are only a fraction as thick. Note de contenu : - Fig. 1 : The black patches on the wings of some butterflies are 10 to 100 times darker than everyday black objects. Clockwise from top left: Catonephele numilia, Parides sesostris, P. iphidamas, Heliconius doris - Fig. 2 : Zoom in to a butterfly's wing, and you'll see tayers of deticate scates. The wing scates of this Rajah Brooke's birdwing butterfly owe their velvety black appearance to a porous texture that helps them trap light - Fig. 3 : A close-up look at the wings of the Rajah Brooke's birdwing butterfly with a scanning electron microscope reveals tiny structures in their wing scales that trap light so that virtually none escapes En ligne : https://drive.google.com/file/d/1nevRRWojR_kv9qmsl-_tMqgVDg_TdEmH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34031 [article]

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High-performance colour pigments for powder coatings : durable, functional and colourful / Mark Ryan in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4660 (04/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4660 (04/2020) . - p. 24-26 Titre : High-performance colour pigments for powder coatings : durable, functional and colourful Type de document : texte imprimé Auteurs : Mark Ryan, Auteur Année de publication : 2020 Article en page(s) : p. 24-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matériaux hautes performances Pigments colorés inorganiques complexes Revêtements poudre Index. décimale : 667.2 Colorants et pigments Résumé : The author discusses CICPs, a class of pigments, which provide specialised properties for the most demanding applications. We surround ourselves with colour. In fact, our use of colour predates even modern humans. Scientists have discovered that our ancestors, Homo helmei, dispersed pigments with an abalone shell and quartz rock into natural resins to produce paints for body adornment. Those earliest pigments were natural ochres. In the intervening eons we have expanded our palette of pigments to include synthetic pigments and organic chemistry based pigments. Still a stalwart of performance are the inorganic pigments and a specific class of these pigments called Complex Inorganic Colour Pigments (CICPs). CICPs provide interesting options for demanding applications for powder coatings. CICPs provide durable colour that can stand up to the most challenging and aggressive processing and applications. They also have excellent dispersion properties so that colour formulas are predictable and stable during production. Recent advances have found that besides colour, these pigments have properties that give them the ability to address regulatory requirements and give not only colour, but functional properties. Note de contenu : - Range of pigments - Properties beyond visual colour - FDA food contact approved CICP pigments - Advances and specialisation in IR reflective black CICPS - Figure : Diagram of pigment and colourant groups En ligne : https://drive.google.com/file/d/1Uab0LjFySn-dsxPU_1TKF2Cl5HQkAT7y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34032 [article]

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Relca® HY-288 : water-based hybrid for coatings with superior stain resistance / Sara Roig in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4660 (04/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4660 (04/2020) . - p. 28-31 Titre : Relca® HY-288 : water-based hybrid for coatings with superior stain resistance Type de document : texte imprimé Auteurs : Sara Roig, Auteur ; Edgar Alarcon, Auteur Année de publication : 2020 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Blanc (couleur) Bois -- Revêtements protecteurs Dureté (matériaux) Essais (technologie) Formulation (Génie chimique) Liants Perméabilité Résistance à l'abrasion Résistance à l'humidité:Résistance à l'eau Résistance aux taches Résistance chimique Revêtement -- Séchage Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The authors discuss the development of this best in class hybrid, the test results and explain the key benefits. As a producer or manufacturer of wooden tables, kitchen countertops and other indoor materials, you want your products to last in real-world conditions. Conditions in which foods like mustard and drinks like coffee and wine get spilled regularly, which can result in stubborn stains. Now, in an innovation designed to give wood coatings superior stain resistance, Stahl Polymers has created Relca® HY-288, a water-based hydrophobic and self-crosslinking hybrid that complies with the highest standards for more sustainable polymers. In this technical article we talk about the development of this best in class hybrid, the test results and explain the key benefits. Note de contenu : - KEY BENEFITS OF RELCA HY-288 AT A GLANCE - WHAT THE TESTS SAY : 1. Solvent test - 2. Hardness development - 3. Drying speed - 4. Early water resistance - 5. Water vapour permeability - 6. Chemical resistance white pigmented formulation - 7. Blocking resistance - Other test results - Table 1 : Physical properties of Relca HY-288 and market reference - Table 2 : Solvent test for Relca HY-288 - Table 3 : Early water resistance results of Relca HY-288 compared to market reference. Explanation score : 5 no change, 4 translucent, 3 white translucent, 2 white opaque, 1 milky - Table 4 : WVP score of Relca HY-288 compared to market reference - Table 5 : Chemicals and stains tested for DIN 68881-1 - Table 6 & 7 : Blocking resistance of Relca HY-288 compared to market reference - Fig. 1 : König hardness development of Relca HY-288 compared to market reference and Picassian® A0-126, a styrene-acrylic - Fig. 2 : Chemical resistance of Relca HY-288 compared to market reference. Explanation score: from 5 [no visible change) to 1 (damaged or destroyed) En ligne : https://drive.google.com/file/d/1PgVtjUYmuphXXZjA6ZZwY5Q3Gdg6wK9L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34033 [article]

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Printing ink, polymers and food packaging - Insight into the unique challenge and vulnerability towards compliance of materials and global regulatory issues / Pinaki Ranjan Samanta in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4660 (04/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4660 (04/2020) . - p. 39-43 Titre : Printing ink, polymers and food packaging - Insight into the unique challenge and vulnerability towards compliance of materials and global regulatory issues Type de document : texte imprimé Auteurs : Pinaki Ranjan Samanta, Auteur ; Ruchi Gupta, Auteur ; Ritu Gupta, Auteur ; Shweta Chauhan, Auteur ; Anuj Johri, Auteur Année de publication : 2020 Article en page(s) : p. 39-43 Langues : Anglais (eng) Catégories : Additifs Aliments -- Emballages -- Aspect sanitaire Colles:Adhésifs Emballages en matières plastiques Encre d'imprimerie Polymères Produits chimiques -- Migration Index. décimale : 667.4 Encres Résumé : The authors present, in part one of a two-part paper, a comprehensive overview of the migration of chemical compounds into food and the challenges of polymeric packaging. Polymeric packaging protects food during storage and transportation and withstands light, and mechanical and thermal stresses. Chemical compounds that are incorporated within polymeric packaging materials to improve functionality, may interact with food components during processing or storage and migrate into the food. Once these compounds reach a specified limit, food quality and safety may be jeopardised. Possible chemical migrants include: printing inks, coatings, plasticisers, antioxidants, thermal stabilisers, slip compounds and monomers. Chemical migration from food packaging is affected by a number of parameters including: the nature and complexity of food, the contact time and temperature of the system, the type of packaging contact layer and the properties of the migrants. Migration, under specific conditions, can be described as the mass transfer of chemicals from food packaging to food during storage and usage. Substances migrating to food give a bad odour to food and, thus, reduce consumer choice. Also because migrating substances create remains on food, they adversely affect food safety and quality. It is a mandatory requirement for suppliers to determine the impact of packaging in contact with food, on food safety. The global regulations on printing inks on food contact materials are not fully harmonised. They vary region to region or country to country. For consumers' safety, the dynamic regulatory landscape and increasing number of regulations, present a challenge for companies developing and manufacturing food packaging or other food contact materials and articles. This review provides a comprehensive overview of the migration of chemical compounds into food and the challenges of polymeric packaging, as well as a discussion of regulatory issues. Note de contenu : - MIGRATION PROCESS - FOOD PACKAGING MATERIALS : Polyolefins - Polytetrafluoroethylene - Polyesters (PET) - Polyamide (PA) - Polycarbonates (PC) - Polystyrene (PS) - Copolymers of ethylene - Poly vinylidene chloride (PVDC) - Vinyl plastics - Migrating components from packaging plastics - INDUSTRIAL POLYMERS : Unreacted monomers and oligomers - Plasticisers - Antioxidants - heat stabilisers - Slip agents - MACROMOLECULAR ADDITIVES IN THE MARKET - PRINTING INKS - LAMINATING ADHESIVES : II. Coldseal adhesives - II. Heat seal coatings - III. Solventless adhesives - IV. Solvent-based adhesives - V. Primers - VI. Water-based adhesives En ligne : https://drive.google.com/file/d/15EfPI8h6VQ5_vLGgPDNrpBj_la4-84ek/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34034 [article]

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Polymers paint colour journal Vol. 210, N° 4660 URL