Micronised synthetic silica gel matting agents for surface coatings : The challenge of VOC reduction / David J. Kent in PAINTINDIA, Vol. LIII, N° 5 (05/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 5 (05/2003) . - p. 63-70 Titre : Micronised synthetic silica gel matting agents for surface coatings : The challenge of VOC reduction Type de document : texte imprimé Auteurs : David J. Kent, Auteur Année de publication : 2003 Article en page(s) : p. 63-70 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Micronised synthetic silica gels are widely used to create matt effects in traditional surface coatings of all kinds. Their unique physical and chemical properties make them well suited to the purpose of matting, stable under a wide range of processing conditions and compatible with most coatings materials. However, commercial grades available have been developed primarily to satisfy the technical and economic demands of conventional solvent-borne systems. The challenge today is to meet the demands of the more environment friendly coatings, such as high-solids, water-borne, powder and radcure coatings, whose market share is growing rapidly. As in other forward-looking branches of the coating raw materials industry, new product development in matting agents is focused on meeting the specific requirements of these new technologies. New products have recently been commercialised and others are imminent. Note de contenu : - THE MATTING CHALLENGE - MATTING WATTER-BORNE COATINGS - MATTING HIGH-SOLIDS PAINTS - MATTING RADCURE SYSTEMS - MATTING POWDER COATINGS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12141 [article]

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Micronised synthetic silica gel matting agents for surface coatings : Versatile and easy-to-use additives! / David J. Kent in PAINTINDIA, N° spécial (01/2003)

[article]  inPAINTINDIA > N° spécial (01/2003) . - p. 131-138 Titre : Micronised synthetic silica gel matting agents for surface coatings : Versatile and easy-to-use additives! Type de document : texte imprimé Auteurs : David J. Kent, Auteur Année de publication : 2003 Article en page(s) : p. 131-138 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Micronised synthetic silica gels are widely used to create matt effects in surface coatings of all kinds. Their unique physical and chemical properties make them well suited to the purpose of matting, stable under a wide range of processing conditions and compatible with most coatings materials. As additives for matting, they can be incorporated directly into a paint as a post additive to adjust gloss. Alternatively, they can be formulated into matting concentrates. The various incorporation routes are described and their relative benefits compared. Guide formulations for matting agent concentrates are given. Note de contenu : - Dispersion of micronised silica gel matting agents - Processing alternatives : concentrate or powder ? : Simplicity – Flexibility – Sensitivity to high shear equipment – Dust development – Optimum use of facilities – Optimum dispersion – Ease of handling – Ease of incorporation – Concentration limit – Formulation considerations – Compatibility – Stability on storage – Post correction of gloss is difficult - Formulation of matting agent concentrates : 1. An alkyd diluted in mineral spirits - 2. A non-reactive resin of broad compatibility in polar solvents – 3. Water, with or without a water miscible solvent – Alkyd/mineral spirits based concentrates – Non-reactive, broad compatibility resin/polar solvent based concentrates – Water based matting concentrates Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12127 [article]

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Micronised synthetic silica gels : High performance matting agents for surface coatings / David J. Kent in PAINTINDIA, Vol. LII, N° 11 (11/2002)

[article]  inPAINTINDIA > Vol. LII, N° 11 (11/2002) . - p. 75-81 Titre : Micronised synthetic silica gels : High performance matting agents for surface coatings Type de document : texte imprimé Auteurs : David J. Kent, Auteur Année de publication : 2002 Article en page(s) : p. 75-81 Langues : Anglais (eng) Tags : 'Agent  matant'  'Traitement  surface'  'Dimension  particule'  Porosité  'Mécanisme  action'  Micronisation  'Gel  silice'  Adjuvant  Formulation  Peinture  'Matériau  revêtement'; Index. décimale : 667.9 Revêtements et enduits Résumé : Micronised synthetic silicas are widely used to create matt effects in surface coatings of all kinds. Their unique physical properties make them ideally suited to the purpose of creating the microroughness necessary for gloss reduction and stable under a wide range of processing conditions. At the same time, their chemical nature renders them compatible with all coatings materials. The most recent developments in silica gel technology are described and the features and benefits of the resulting products, which provide controllable and reproducible performance in a wide variety of coating systems, are highlighted. Note de contenu : - Mechanism of matting - The "ideal" base material - Silica gel technology : Features and benefits : - Porosity : the key to high efficiency - Particle size control : optimum gloss reduction and surface smoothness - Surface modification : Stability and compatibility - Advances in silica gel matting agents Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12427 [article]

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New age matting agents / V. Petry in PAINTINDIA, Vol. LIII, N° 1 (01/2003)

[article]  inPAINTINDIA > Vol. LIII, N° 1 (01/2003) . - p. 47-68 Titre : New age matting agents Type de document : texte imprimé Auteurs : V. Petry, Auteur ; T. Fletcher, Auteur ; David J. Kent, Auteur Année de publication : 2003 Article en page(s) : p. 47-68 Note générale : Bibliogr. Langues : Anglais (eng) Résumé : Matting agents are widely used additives to reduce the gloss in a variety of coatings applications. In this article three types of new matting agents are discussed. High pore volume-matting agents for conventional solvent borne lacquers, matting of UV-cured systems and gloss control additives for thermosetting powder coatings. The efficiency of matting agents in conventional solvent borne lacquers depends on factors such as, type of silica, particle size distribution and porosity of particle. Here the influence of high porosity silica gels on matting efficiency and rheology in 2 pack polyurethane, waterborne polyurethane, alkyd, and polyester melamine system, is discussed. Matting efficiency differences and influence on viscosity depends, not only on porosity but also on particle size distribution, organic treatment and on the coatings formulation. Creating matte effects in traditional coatings presents no great technical problems, since adequate film shrinkage results from evaporation of volatile components. It is proposed to discuss the matting of modern coatings, like the emerging market of UV-cured lacquers and thermosetting powder coatings, which undergo minimal or no shrinkage during film formation. The study on UV cured coatings is based on the use of Design of Experiments and 6-Sigma Tools, to investigate the correlation of UV-formulation and lacquer properties, beside the known effects of matting agent on film and lacquer properties. The matting of powder coatings as induced by novel reactive matting agents will be outlined in terms of changes in rheological properties and in terms of changes in surface profile statistics that take place during film formation. Attention to the influence of gloss level on other film properties will be given. Note de contenu : - Conventional solvent borne lacquers - Matting of alkyd lacquers - Thixotropic alkyd lacquers - Polyurethane lacquers - Waterborne PU customer lacquer for leather coating - Polyester coil coatings system - The so-called “high-solids or 100%” systems - Screening design - Detailed investigation of monomer influence - Detailed investigation of oligomer influence on matting - Matting of powder coatings - Matting powder coatings - New matting agents for powder coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12072 [article]

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The effect of UV-curable formulations and matting agents on lacquer properties / V. Petry in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B2 (06/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B2 (06/2004) . - p. 103-109 Titre : The effect of UV-curable formulations and matting agents on lacquer properties Type de document : texte imprimé Auteurs : V. Petry, Auteur ; David J. Kent, Auteur Année de publication : 2004 Article en page(s) : p. 103-109 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Agent mattant Brillance (optique) Formulation (Génie chimique) Laque et laquage Oligomères Plan d'expérience Vernis -- Additifs Vernis -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Creating a matt effect in a 100% solid UV-cured coating provides the formulator with considerable difficulty due to inadequate film shrinkage. Despite this, good matting is still achievable, although success depends on the formulation components and mode of curing. This paper discusses the correlation between UV-curing formulations, application performances together with their potential problems, and solutions associated with the use of silica matting agents. It was found that the type of monomer and organic treatment of the matting agent used were the main effects determining matting efficiency and foam. Note de contenu : - Previous studies - Experimental details : Screenint design - Sample preparation - Detailed investigation of monomer influence - Detailed investigation of oligomer influence on matting - Table 1 : Properties of used matting agents - Table 2 : General screening DOE (design of experiment - Table 3 : Main effects on gloss, curing conditions and foam. Wft : qet film thickness ; MA type : matting agent type (GRACE 1 or 3) ; MA Conc : matting agent concentration ; Tstorage : storage temperature : speed belt : conveyor speed - Table 4 : Details of monomer investigation - Table 5 : Significant factors on gloss and foam - Table 6 : Test formulation - Table 7 : Selected acrylated oligomers - Table 8 : Results of oligomer influence investigation DOI : 10.1007/BF02699604 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699604.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5470 [article]

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The matter of monomers / David J. Kent in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2013)  

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The problem of gloss variations in matt coatings caused by variations in film thickness and how to minimise this effect / David J. Kent in PAINTINDIA, Vol. LIV, N° 1 (01/2004)

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