Chemistry of silicone additives / W. Scholz in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/00 (06/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6/00 (06/2000) . - p. 66-67 Titre : Chemistry of silicone additives Type de document : texte imprimé Auteurs : W. Scholz, Auteur Année de publication : 2000 Article en page(s) : p. 66-67 Langues : Anglais (eng) Catégories : Revêtements -- Additifs:Peinture -- Additifs Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Polymethylalkylsiloxanes - Organically modified polysiloxanes - Other modifications - Fig. 1 : Unmodified polydimethylsiloxanes - Fig. 2 : The modification with polyether chains opens up a large number of opportunities Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33513 [article]

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Defoamers - an introduction / W. Scholz in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/99 (10/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/99 (10/1999) . - p. 90-92 Titre : Defoamers - an introduction Type de document : texte imprimé Auteurs : W. Scholz, Auteur Année de publication : 1999 Article en page(s) : p. 90-92 Langues : Anglais (eng) Catégories : Antimousse Index. décimale : 660.2 Génie chimique Note de contenu : - What is a foam ? - A foam is less stable than a liquid - Lifeline in a foam - Elasticity is an essential factor - Fig. 1 : Directly after their formation, the gas bubbles in the liquid rise - Fig. 2 : In the drainage effect, liquid flows out the film surrounding the gas bubble, until the lamella finally tears - Fig. 3 : Surfactant molecules consist of a hydrophilic and a hydrophobic part - Fig. 4 : In the course of time, a "polyhedral foam" is formed from spheical foam bubbles - Fig. 5 : Due to the drainage effect, the two interfaces of the lamella shift closer and closer together until the repulsion caused by the effect of charges with the same sigh prevents the liquid from flowing away completely En ligne : https://drive.google.com/file/d/1Kq6bFUf5Gzq5NVYAfe67zrN-0TkMEoFN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33526 [article]

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Lower footprint by best available technologies / W. Scholz in LEATHER INTERNATIONAL, Vol. 214, N° 4826 (11-12/2012)  

[article]  inLEATHER INTERNATIONAL > Vol. 214, N° 4826 (11-12/2012) . - p. 46-48 Titre : Lower footprint by best available technologies Type de document : texte imprimé Auteurs : W. Scholz, Auteur ; T. Huang, Auteur ; K. Hill, Auteur Année de publication : 2012 Article en page(s) : p. 46-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioréacteurs Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Recyclage Eaux usées -- Stations de traitements Economies d'énergie Efficacité énergétique Gaz à effet de serre -- Réduction Membranes (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Measurements to reduce the carbon footprint have become increasingly important to improve the competitiveness of tanneries as well as improve the public perception. It is also useful to fulfil the requirements of new regulations such as the Chinese energy reduction plan for light industry of 20% by 2015. W2O environment has implemented new technologies at Simona Tanning, which have been selected according to Best Available Technology (BAT) by reducing energy consumption and increasing the treatment efficiency and effluent quality. Simona Tanning is a pioneer implementing BAT for highly efficient tannery effluent treatment, generating lowest possible carbon emissions, and can be considered to operate the best performing tannery effluent treatment plant in China. Note de contenu : - Balancing - Primary treatment using dissolved air flotation - Biological treatment - Membrane bioreactor (MBR) and reverse osmosis (RO) - Sludge handling and drying - Reed beds - Fenton process - Results - Fig. 1 : Overview of treatment plant configuration - Fig. 2 : Membrane bioreactor with submerged membranes - Table 1 : Effluent treatment plant performance - Table 2 : Energy performance En ligne : https://drive.google.com/file/d/1e4PbPg9xL60RJl5g7o67Z_JvCLuhY25j/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35472 [article]

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Pigment wetting and dispersing additives / W. Scholz in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 83-87 Titre : Pigment wetting and dispersing additives Type de document : texte imprimé Auteurs : W. Scholz, Auteur Année de publication : 1999 Article en page(s) : p. 83-87 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Why are wetting and dispersing additives utilized ? - The dispersing process - How do weeting and dispersing additives perform ? - Controlled flocculating wetting and dispersing additives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12982 [article]

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The use and subsequent treatment of surfactants for leather processing / Rumon A. Hankey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 6 (06/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 6 (06/2001) . - p. 205-213 Titre : The use and subsequent treatment of surfactants for leather processing Type de document : texte imprimé Auteurs : Rumon A. Hankey, Auteur ; V. L. Addy, Auteur ; K. Senior, Auteur ; D. A. Langridge, Auteur ; Warren Bowden, Auteur ; W. Scholz, Auteur Année de publication : 2001 Article en page(s) : p. 205-213 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The appropriate choice of the type of surfactant for degreasing is very important. In today's environment, pressures from 'green' issues limit the choice of type of degreaser used. The method of comparing degreasers for use in bovine soaking and liming systems is discussed along with the screening of suitable alternatives to Nonyl Phenol Ethoxylate based degreasers. The volume of the grease emulsion in the waste water can be reduced by the use of ultrafiltration. Alkyl phenol ethoxylates function as effective surfactants. More specifically, nonyl phenol ethoxylates (NPE) exhibit excellent wetting and emulsification properties which has resulted in their use as cost effective detergents for the leather industry. Recently, however, their use has been questioned due to environmental concerns. The objective of this study was, therefore, to evaluate commercially available alternative surfactants to nonyl phenol ethoxylate (NPE) based products for the removal of dermal fat from bovine hides. The performance of the surfactants was tested, initially using a model system based on extracted bovine subcutaneous lipid. Subsequently the best four products (tested under the conditions of the assay) were evaluated in small-scale trials. The assay system proved effective for differentiating between good and poor emulsifiers of bovine fat. Four products were selected for exhibiting performance equal to the NPE based products.These products were subsequently evaluated in soaking and liming trials in the production of bovine wet blue. Each of the surfactants gave performance equivalent to that given by the NPE based products. However, the levels of intra-dermal fat were low, in the region of 1.0% and meaningful quantitative analysis was therefore difficult. This suggests that problematic degreasing in bovine processing may originate from poorly fleshed hides rather than residual intra-dermal fat. There was no evidence of redeposition of fat into the wet blue. In conclusion, a number of surfactant products that give acceptable removal of hide fat and contain no NPE have been identified. Their use in full-scale production has not been evaluated within the scope of this project. Two techniques for determining the amount of surfactant present in liquors and leather have been evaluated and developed. The combination of these analytical techniques may enable further optimisation of processes with a view to allowing an overall reduction in offers of surfactants used. The treatment of surfactants in the waste water treatment plant is difficult. Progress has been made by the use of ultrafiltration to remove up to approximately 90% of grease-emulsion from waste streams. En ligne : https://drive.google.com/file/d/1tGm3R7dvS2HHvAyZLPsZToUHFHE84FP-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4372 [article]

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