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An introduction to different plastics and approaches to coating them / Paul Sheppard in SURFACE COATINGS INTERNATIONAL, Vol. 106.1 (01-02/2023)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 106.1 (01-02/2023) . - p. 28-37 Titre : An introduction to different plastics and approaches to coating them Type de document : texte imprimé Auteurs : Paul Sheppard, Auteur Année de publication : 2023 Article en page(s) : p. 28-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Energie de surface Matières plastiques Matières plastiques -- Revêtement Mesure Tension superficielle Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : This article explores the different types of common plastics and materials that require coating, the typical issues faced, and the various types of pretreatments required for successful results. There are many types of plastic to consider, and this article will discuss the differing approaches needed to achieve adhesion to the chosen substrate. One common description of plastic is "a polymeric material that has the capability of being moulded or shaped, usually by the application of heat and pressure". The word plastic was first used in the English language in the 1630s as an adjective meaning "capable of shaping or moulding a mass of matter" from the Latin plasticus, and from the Greek plastikos meaning to"grow"orlorm". The word evolved from its adjective meaning and started to be used as a noun in the early 20th century, and used in this sense to describe Bakelite, commonly considered as the world's first entirely synthetic plastic. The plastics industry has a long and rich history that dates back further than you may think; the Horners Company of London were first mentioned in 1284 with horn and tortoiseshell considered as natural plastics, used to produce all manner of products from combs to piano keys and billiard balls. By the middle of the 19th century, some animal-derived materials were in short supply leading to species, such as turtles and elephants, facing extinction due to increasing demand for tortoiseshell and ivory. Industrialists realised the scale of this environmental and economic problem and set about inventing new semi-synthetic materials based on chemically modified natural substances, such as cork, milk and even blood. Semi-synthetic materials made way to fully man-made materials, such as Bakelite, invented in 1907 by Belgian chemist Leo Baekeland. In 1920 Hermann Staudinger proved the existence of polymers, in doing so creating a new industrial field of chemistry. Now, the term polymer can be used to describe any plastic and other naturally occurring organic compounds, such as DNA. In the early decades of the 20th century, the chemical and petroleum industries began to form alliances, driven by the desire to make use of by-products created by processing crude oil and natural gas. Some of these companies are recognisable and supply the coatings industry today, such as BASF, Dow and DuPont. The post-war consumer boom, driven by affordable products made from differing plastics, also spurred development in this field, but discerning consumers also wanted decorative effects and functionality, so coatings would have to be used. Although many plastics are coloured by masterbatch additives or fully pigmented, there are many applications that require the use of coatings, but as will be explained many plastics can be difficult to coat successfully without a certain level of preparation. Note de contenu : - DIFFERENT TYPES OF PLASTIC : Thermosets - Thermoplastics - Polyethylene terephthalate - Polyethylene (PE) - Polyvinyl chloride (PVC) - Low-density polyethylene (LDPE) - Polypropylene (PP) - Polystyrene (PS) - Acrylonitrile-butadiene-styrene (ABS) - GRP and carbon fibre - Polyamide - Polycarbonate - Polylactic acid - Poly(methyl methacrylate) - Polyoxymethylene - Polyurethane - Styrene acrylonitrile - WHY ARE PLASTICS DIFFERENT COMPARED TO OTHER SUBSTRATES ? - SURFACE ENERGY AND SURFACE TENSION : Dispersive and polar surface energy - Measurement - SURFACE TENSION - SURFACE PRETREATMENT : Flame treatment - Corona treatment - Plasma treatment - Ozone treatment - Table : Typical values of surface energy or surface tension for different materials En ligne : https://drive.google.com/file/d/1ybP0LSFIc0OcnqByG3ViSqlj3wXRsjkV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38872 [article]

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HYPOMER MT 2550K - Hydroxy acrylic matting resins / Ana Sanchez in SURFACE COATINGS INTERNATIONAL, Vol. 106.1 (01-02/2023)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 106.1 (01-02/2023) . - p. 46-48 Titre : HYPOMER MT 2550K - Hydroxy acrylic matting resins Type de document : texte imprimé Auteurs : Ana Sanchez, Auteur Année de publication : 2023 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Adhésion Agent mattant Matières plastiques -- Revêtement Polyhydroxyacrylique Produits commerciaux Revêtements (produits chimiques) Toucher Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : HYPOMER® MT 2550K is a proprietary hydroxy acrylic-based, liquid matting resin that provides excellent matting effect without the addition of any additional matting agent upon drying. It comes in a low odour, aromatic-free composition. Dry films of the resins are characterised by excellent transparency, smoothness and tactile or touch feel effect. It is produced using a special polymerisation reaction and a process that combines non-soluble acrylic particles with a liquid resin through a bridging mechanism.Through a good balance of hydrophilicity and hydrophobicity, the solid particles are uniformly dispersed and suspended in the liquid resin to form an opaque white liquid. It has good adhesion on ABS, ABS/PC and other plastic substrates. It also has good compatibility with conventional hydroxy acrylic resins. Consequently, these resins combinations and other OH-functional crosslinking resins (e.g. acrylic, PU) produce, depending on the ratio, a wide range of semi-matt to matt clear, solid colour and metallic finishes with excellent performance. Note de contenu : - Matting theory - Experimental - Table : Physical properties En ligne : https://drive.google.com/file/d/1iNbtKssbDiSZ3-NqDMkUuEe8L_u9GD0P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38873 [article]

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Improving indoor air quality with amino alcohols / Mark Langille in SURFACE COATINGS INTERNATIONAL, Vol. 106.1 (01-02/2023)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 106.1 (01-02/2023) . - p. 52-55 Titre : Improving indoor air quality with amino alcohols Type de document : texte imprimé Auteurs : Mark Langille, Auteur ; Romain Severac, Auteur Année de publication : 2023 Article en page(s) : p. 52-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air -- Epuration Air intérieur Amino-alcools Dépolluants Formaldéhyde -- Elimination Formulation (Génie chimique) Matériaux -- Propriétés fonctionnelles Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements intérieurs:Peinture intérieure Index. décimale : 667.9 Revêtements et enduits Résumé : Amino alcohols based on ANGUS chemistry can assist formulators in creating more environmentally-friendly paints and coatings. Multifunctional additives from ANGUS can be used to create low- and zero-VOC waterborne formulations, as well as low emissive coatings that qualify for green label certification programs. Amino alcohols are also highly effective formaldehyde scavengers that can be used to create functional coatings that improve indoor air quality.The level of hazardous air pollutants can be five times higher in indoor air than outdoor air and chronic exposure to these invisible indoor toxins, such as formaldehyde, can create long-term health problems. An attractive solution to reducing indoor formaldehyde levels is through a chemical remediation or scavenging system, and one of the emerging trends for the effective removal of indoor air contaminants is the use of functional coatings. We demonstrate how the unique functionality of amino alcohols can help improve indoor air quality by providing high-efficiency formaldehyde scavenging performance when used in waterborne architectural paints. Amino alcohol additives are highly effective at low dosages and do not require major reformulation work, enabling the creation of functional coatings to improve indoor air quality. Note de contenu : - ANGUS products for improving indoor air quality - Methodology - Formaldehyde Scavenging Test by ISO 16000-23 - Results - Table 1 : Base waterborne formulation - Table 2 : Performance of coatings formulations according to Chinese JC/T 1074-2008 standard - Fig. 1 : The evolution of more environmentally-friendly paints and the emergence of VOC remediation technologies - Fig. 2 : Analysis of airborne VOC concentrations in residences, daycare centres and schools in France - Fig. 3 : Reaction of AEPD VOX 1000 with two equivalents of formaldehyde to yield a bisoxazolidine - Fig. 4 : Reaction of TRIS AMINO with two equivalents yield a bisoxazolidine - Fig. 5 : Schematic of a small-scale testing chamber to monitor formaldehyde scavenging performance of a coating - Fig. 6 : Evaluation of scavenging performance according to 150 16000-23 test method En ligne : https://drive.google.com/file/d/1OxJWCAJhoNmjnT-pN6mzI03-xnzhdkXt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38874 [article]

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