[article]
| Titre : |
Innovative functional concepts for barrier coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Anil Bansal, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 80-96 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Brillance (optique)
Fibres inorganiques
Formulation (Génie chimique)
Matériaux -- Propriétés barrières
Opacité (optique)
Revêtement en phase solvant:Peinture en phase solvant
Revêtements en phase aqueuse:Peinture en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Paints and coatings are not useful products by themselves, but they make other products look better, more durable, more attractive, safer, and more saleable. Paints and coatings are therefore considered enabling materials that add value to manufactured products. Think of a car without paint on it, or your nice teak wood furniture without a finish. Thin coats of paint, coating, or varnish bring life to these products and make them acceptable and durable.
Mineral particles are used as fillers in a range of applications, including paper, decorative and functional coatings, plastics and ceramics. To a mineralogist, minerals are defined primarily by their chemical composition. For the producer and end user, the physical properties of these industrial mineral products such as size and shape distribution, refractive index, density, hardness, and color are of primary importance, since it is the combination of these, together with its crystal structure and surface chemistry, which gives the mineral its functionality. The morphology of the particles constituting the mineral within a desired particle size distribution can be a key factor in determining the functionality of the end use.
There are many applications where the barrier properties of paints and coatings are key factors determining performance: For example, in protection against sunlight, air, moisture, dirt and corrosion of metals/substrate. The paint technologist therefore needs an understanding of the important parameters control ling permeability in order to design an appropriate product.
Minerals with a high aspect ratio, when aligned in a coating structure, create a tortuous path that can reduce the penetration rate of a permeating material. At a constant coat weight, there are more thin plate stacks compared to a blocky mineral system. This creates a more tortuous path for liquid and vapour penetration. So, it is clear that higher aspect ratio materials give reduction in permeability, compared to more blocky system.
In general, platy particles overlap in a film and prevent water, oxygen or other chemicals to reach the substrate basis directly, meaning the time for corrosion stimulators to start their work is increased. The addition of such platy additives in rust prevention, anti-corrosive and concrete coati ngs ensure optimal performances for surface protection.
There are many ways to define sustainability, but when most people here the word "sustainable," they immediately think "green". Often the most important, long term sustainability goal for businesses is having environmentally responsible products and practices — those that lessen or eliminate negative impacts on the environment. Environmentally sustainable practices can have long-lasting effects.
Most barrier solutions available on the market are based on polyethylene, or additives containing harmful halogens. Though these components give excellent results as a barrier but have a very harmful impact on health and environment. Therefore, ail our barrier coating is mineral based solutions having no negative impact on health and environment. They provide a prise-competitive and environmental friendly alternative.
High aspect ratio wet ground Mica provides barrier formation for anti-corrosion coatings impeding the transport of aggressive species into any metal surface.
Surface modified platy minerals for green corrosion protection coatings can be used to formulate eco-friendly corrosion protection coatings which no longer require special labelling, giving them a genuine market advantage. Even without the addition of corrosion protection pigments, these formulations provide outstanding protection.
Lamellar high aspect ratio talc increase barrier effect of the paint film by increasing hiding power, mud crack and weather resistance. Lamellar talc grades is white and produced with special grinding technique not to destroy natural lamellarity. It can be micronized without distorting it's structure due to advanced technology.
Platy iron oxide provides tough barrier surface and excellent UV absorption layer. They are excellent weather resistant and anti-rust. They are also used in zinc-rich primers.
In this study, different functional play minerals were evaluated in relation to their corrosion protection, based on barrier behavior. The following platy minerals were used for study : surface modified kaolin, lamellar high aspect ratio talc, wet groung mica and platy iron oxide. |
| Note de contenu : |
- Platy minerals provide following properties in paints & coatings
- AR TALC T-LAMELLAR HIGH ASPECT RATIO TALC : Solution for industrial coatings
- SEM IMAGE OF NORMAL MICRONIZED TALC AND HIGH ASPECT RATIO TALC
- AR TALC IMPROVES THE PERFORMANCE OF INDUSTRIAL PAINTS AND PRIMERS : Corrosion protection - Weather, scrub, colour UV resistance - VOC reduction - AR TALC T as an extender in alkyd paint
- AR TALC T AS AN EXTENDER IN HIGH PVC EMULSION DECORATIVE PAINT
- AR TALC IMPROVE DY HIDING POWER AND MAKE COST-EFFECTIVE TiO2 EXTENDERS
- OBSERVATION
- HYPERLITE ST-HYDROPHOBICALLY MODIFIED CALCINED KAOLIN RE-THINKING WATER REPELLENCY : Protection against water, natural enemy for masonries - Guide formulation for exterior emulsion paints for water repellency by using surface treated flash calcined kaolin
- HIGH PERFORMANCE - LOW WATER ABSORPTION (FASTER DRYING) : High performance - Low fouling - High performance - Beading effect
- CUSTOMER BENEFITS OF HPERLITE ST AT A GLANCE (see Table 4)
- MICRON FERROX NRL-PLATY RED OXIDE. HIGH QUALITYPIGMENTS FOR MARINE & PROTECTIVE PAINTS : Platy iron oxides as anti-corrosive pigments - Performance of micron ferrox -NRL
- AR MICA T - WET GROUND MICA HIGH QUALITY PIGMENTS FOR EXTERIOR DURABILITY : Our wet ground mica has a high aspect ratio and is used in a broad range of applications, including
- TABLES : 1. Guide formulationof alkyd paint by using AR talc t - 2. Guide formulation of high PVC emulsion decorative paint bu using AR talc T - 3. Guide formulation for exterior emulsion paints for water repellency by using surface treated flash calcined kaolin - 4. Guide formulation of premium exterior emulsion paint by using wet ground mica (AR mica T) |
| En ligne : |
https://drive.google.com/file/d/1ZFMPHkXf-6SYS8e43n8eOClSerqI8Gff/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28449 |
in PAINTINDIA > Vol. LXVII, N° 3 (03/2017) . - p. 80-96
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Innovative functional concepts for barrier coatings in PAINTINDIA, Vol. LXVII, N° 3 (03/2017)
