Additives for water-borne coatings / Wernfried Heilen / Hannover [Germany] : Vincentz Network GmbH & Co. (2021)

Titre : Additives for water-borne coatings Type de document : texte imprimé Auteurs : Wernfried Heilen, Auteur ; Adalberg Braig, Auteur ; Anne Drewer, Auteur ; Patrick Glöckner, Auteur ; Roman grabbe, Auteur ; Juergen Kirchner, Auteur ; Frank Kleinsteinberg, Auteur ; Benoît Magny, Auteur ; Thomas Matten, Auteur ; Ingrid K. Meier, Auteur ; Kirstin Schulz, Auteur ; Heike Semmler, Auteur ; Jean-Marc Suau, Auteur Mention d'édition : 2nd revised Ed. Editeur : Hannover [Germany] : Vincentz Network GmbH & Co. Année de publication : 2021 Importance : 270 p. Présentation : ill. Format : 23 cm ISBN/ISSN/EAN : 978-3-7486-0486-0 Prix : 169 E Note générale : Index - Bibliogr. Langues : Anglais (eng) Catégories : Revêtements en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Water-borne systems are the coatings of the future. The market is developing an insatiable appetite for ecologically sound coatings based on renewable raw materials. The demands on coating performance are at least as high as those on environmental compatibility. Additives help to protect the environment by effectively reducing the use of organic solvents. Many of today’s water-borne coatings could not be formulated without them. When incorporated into water-borne paints, coatings and printing inks, they enhance both the production process and the performance of the applied inks and coating materials. Additives for water-borne coatings is a must read for formulators wishing to brush up on water-borne coating systems, as well as experts seeking to have detailed knowledge at their finger tips. Note de contenu : - Wetting and dispersing additives - Defoaming of coating systems - Synthetic rheology modifiers - Substrate wetting additives - Improving performance with co-binders - Deaerators - Flow and levelling additives - Wax additives - Light stabilisers - In-can and dry film preservation - Hydrophobing agents - Functional silica with unique properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40424

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Bringing surfaces under control / Heike Semmler in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2020)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6 (06/2020) . - p. 16-21 Titre : Bringing surfaces under control : How to optimise coating surfaces by using specialFy modified siloxanes Type de document : texte imprimé Auteurs : Heike Semmler, Auteur ; Roger Reinartz, Auteur ; Ingrid K. Meier, Auteur ; K. Michael Peck, Auteur Année de publication : 2020 Article en page(s) : p. 16-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs Formulation (Génie chimique) Jaune Pigments Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Résistance à l'abrasion Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse -- Additifs Revêtements organiques Vernis en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Surface control additives can be engi-neered to provide a range of benefits in water-borne coating formulations. This article describes a study aimed at clari-fying some general structure-property relationships. Note de contenu : - Benefits of siloxanes - Siloxanes and slip - Recoatability is a problem - Experimental : Design of surface control additives - Properties in two wood-coating formulations - Test of emulsion-type additives in a clearcoat formulation - Better blocking and scratch resistance - Test of 100 % active matter additives in a pigmented formulation - Blocking - Cross-cut adhesion - Organo-modified siloxanes as versatile toolbox for surface effects - Table 1 : Characteristics of siloxane-based surface control additives used in this study - Table 2 : Water-borne self-crosslinking modified acrylic clear wood-coating based on "NeoCryl XK-12" - Table 3 : Performance of surface confrol additives when post-added fo a wafer-borne self-crosslinking modified acrylic wood coating ("NeoCryl XK-12") - Table 4 : Pigmented water-borne acrylic wood coating based on "Acronal LR 9014" and Pigment Yellow concentrate - Fig. 1 : Scratch resistance testing and ratings - Fig. 2 : Comparative effects of surface control additives on the blocking properties of a pigmented water-borne acrylic wood coating - Fig. 3 : Cross-cut areas of panels that were coated twice with pigmented water-borne acrylic wood coatings containing 0.5 wt % surface control additives En ligne : https://drive.google.com/file/d/150Acf66umSHnqwoe2lBQgmhz4Wnp-6Va/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34288 [article]

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Elimination and prevention of microfoam / Heike Semmler in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/00 (06/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6/00 (06/2000) . - p. 26-36 Titre : Elimination and prevention of microfoam Type de document : texte imprimé Auteurs : Heike Semmler, Auteur ; Wernfried Heilen, Auteur Année de publication : 2000 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Microfoam, its prevention and elimination is a major problem during paint production and application of water-based systems. Especially the airless spray application causes microfoam and its elimination sets high requirements for paint suppliers, manufactures and raw material suppliers. The article will discuss the parameters influencing the activity of dearetors against microfoam in water-based coating. It is explained and demonstrated how the specific composition of deaerators makes it possible to eliminate and prevent microfoam especially in airless applied coatings-without negative influence on optical appearance or physical film properties. Note de contenu : - Formation of macro-and microfoam - Formation of microfoam during airless application - Elimination of microfoam - Paint additive to eliminate microfoam - Test method for generation and evaluation of microfoam - Airless application - Testing of substance classes - Modification of substance class A - Influence of hydrophobic particles - Summary of the test results - Activity of silicone polyether with regards to microfoam elimination - Airless spray application - Measurement of droplet particle size - Drying process Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11005 [article]

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How to optimize coating surfaces by using specialty modified siloxanes / Heike Semmler in SURFACE COATINGS INTERNATIONAL, Vol. 104.2 (03-04/2021)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 104.2 (03-04/2021) . - p. 122-125 Titre : How to optimize coating surfaces by using specialty modified siloxanes Type de document : texte imprimé Auteurs : Heike Semmler, Auteur ; Roger Reinartz, Auteur ; Ingrid K. Meier, Auteur ; K. Michael Peck, Auteur Année de publication : 2021 Article en page(s) : p. 122-125 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs Formulation (Génie chimique) Jaune Pigments Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Résistance à l'abrasion Revêtements en phase aqueuse -- Additifs Vernis en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Siloxane-based additives are critical tools in coating applications: their structures can be varied in order to provide a broad range of performance benefits in many types of formulations. Surfactants and defoamers are commonly recognised additive classes, but also many other functionalities can be derived from siloxane chemistries, particularly attributes related to surface control, such as flow and levelling, slip, scratch resistance and haptic properties. This extensive range of performance is achievable due to the broad flexibility inherent in siloxane chemistry, allowing a fine-tuned balance of compatibility, incompatibility and surface activity. As with many additive types, a broad range of functionalities creates many options for improvement and innovation, but also presents challenges in finding the right additive and optimising molecular structure to achieve the desired performance. In order to clarify some general structure-property relationships, a study was carried out. Due to their unique interfacial activity, siloxane-based surface control additives have become invaluable tools in the coating formulator's tool box. Many surface control additives are capable of mitigating surface energy gradients that can exist within a liquid film immediately after application ; thus, they can improve flow, prevent retraction, minimise cratering, enable better surface levelling and ensure a flawless surface appearance. As their surface activity increases, surface control additives can also render special properties to the surface of the coating. For example, depending on their chemical structures, certain surface control additives can impact surface slip, affect haptic properties (surface 'feel'), impart scratch resistance, act as anti-blocking agents and even create a release effect on the surface of the cured coating. This is of great importance in many areas of application, but especially for wood coatings, which typically have to combine very good aesthetics with high mechanical resistance. The property of 'slip' is characteristic of a smooth sliding motion across the coating that results from a reduced coefficient of friction. lt is quantified as the force needed to slide a mass across the coating surface. The material properties of both the substrate and the object to be moved are reflected in the static and dynamic coefficients of friction with contributions from the chemical composition of the coating and the interactions arising from it, as well as surface roughness. Surface control additives with large polydimethylsiloxane segments and a high degree of surface activity can ensure particularly slippery surfaces. Additionally, coatings with a high slip often feel smooth and silky. Coatings may also resist scratching when the scraping object slips off the surface rather than penetrating the coating film ; however, force-dependent scratch resistance of a coating can only be significantly improved if the surface control additive used contains functional groups that do not interact strongly with one another. Organo-modified siloxanes, with a high percentage of polydimethylsiloxane domains, exhibit particularly weak interactions both with each other and with other materials. This can make them ideal for this purpose. Moreover, during the drying process, organo-modified siloxanes continually migrate to the air-liquid interface, producing a lubricating film that significantly reduces the coefficient of friction of the coating. When a cured coating surface has a strong polydimethylsiloxane character due to the use of a surface control additive, it is also more likely to resist blocking — adhesion of the dried coating to another freshly coated surface or other substrates. While it is possible to achieve a variety of desired benefits by using siloxane-based surface control additives that have large polydimethylsiloxane segments, most coatings eventually need to be recoated. The downside to employing strongly hydrophobic and oleophobic surface control additives is the tendency for the resultant coating to have a very low surface energy and to be very difficult — if not impossible — to recoat. Even if a second coating layer can be applied to such a surface, lack of adhesion and the tendency for the second coating layer to show craters are true problems. Note de contenu : - Design of surface control additives - Properties in two wood coating formulations - Test of emulsion-type additives in clear coat formulation - Table 1 : Characteristics of siloxane-based surface control additives in this study - Table 2 : Waterborne self-crosslinking modified acrylic clea wood coating based on NeoCryl XK-12 - Table 3 : Performance of surface control additives when post-added to a waterborne self-crosslinking modified acrylic wood coating (based on NeoCryl XK-12) - Table 4 : Pigmented waterborne acrylic wood coating based on ACRONAL LR 9014 and Pigment Yellow 42 concentrate - Fig. 1 : Scratch resistance testing and ratings - Fig. 2 : Comparison of the effects of surface control additives on the blocking properties of a pigmented waterborne acrylic wood coating - Fig. 3 : Comparison of cross-cut areas of panels that have been coated twice with pigmented waterborne acrylic wood coatings containing 05 wt% surface control additives En ligne : https://drive.google.com/file/d/1LAnKlTYPYRTilx7GwkMEANR6lSywT8qi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35999 [article]

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Wood clearcoats - Beautiful & tough / Heike Semmler in EUROPEAN COATINGS JOURNAL (ECJ), (06/2023)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > (06/2023) . - p. 28-33 Titre : Wood clearcoats - Beautiful & tough : Novel spherical precipitated silica for mechanically robust matte coatings Type de document : texte imprimé Auteurs : Heike Semmler, Auteur ; Ellen Reuter, Auteur ; Berend-Jan de Gans, Auteur ; Nadia Lenhardt, Auteur Année de publication : 2023 Article en page(s) : p. 28-33 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agent mattant Ameublement Bois -- Revêtements protecteurs Bois -- Vernis Formulation (Génie chimique) Résistance à l'abrasion Résistance aux traces Revêtements organiques Rhéologie Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Vernis -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : As wood coatings typically combine protective and decorative properties, mechanical robustness is a key characteristic. However, it can be a real challenge to achieve surface resistance to burnishing, particularly for low-gloss formulations. Specialty particles such as novel spherical precipitated silica can help improve the mechanical robustness of matte coatings and achieve low gloss with superior haptic properties when combined with silica matting agents. Note de contenu : - Rheology optimisation is crucial - Testing burnishing resistance - Black heel mark resistance testing - Novel combination increases scratch resistance - Mechanical stress may be diverted by novel particles - Improved scratch resistance for parquet coating formulation - Natural wood appearance and durability - Figure : Results in furniture coating formulation En ligne : https://drive.google.com/file/d/1GUU0cQehMMIG8LFJsvgXyEAnw-f6TtqL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39461 [article]

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