6 résultat(s) recherche sur le tag 'Amorceur'

Accelerated UV drying systems / G. Webster in SURFACE COATINGS INTERNATIONAL, Vol. 79, N° 5 (05/1996)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 79, N° 5 (05/1996) . - p. 215-220 Titre : Accelerated UV drying systems Type de document : texte imprimé Auteurs : G. Webster, Auteur Année de publication : 1996 Article en page(s) : p. 215-220 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Encre  'Impression  à  plat'  Typographie  Flexographie  Sérigraphie  Durcissement  Séchage  'Rayonnement  UV'  'Pigment  organique'  Amorceur  'Polymérisation  photochimique' Index. décimale : 667.9 Revêtements et enduits Résumé : What is meant by accelerated drying ? Virtually every type of printing ink uses some system or technique to enhance its drying capability. Often this means applying some type of energy to the ink to promote the evaporation of solvent, induce a chemical reaction, or a combination of both. Ovens or kilns and sources of electromagnetic radiation can be used to impart energy to a wet ink or coating converting it to a solid dry film. Electromagnetic radiation includes Radio Frequency (RF), Microwave, Infrared (IR) and Ultraviolet (UV) radiation. Electron Beam (EB) can also be used and this is analogous to UV in terms of the type of materials and chemistry used in ink and coating formulations. The aim of most printers is to achieve the conversion from wet to dry ink as quickly as possible. The most efficient and effective use of energy transfer combined with a similarly reactive ink or coating is going to be most successful in achieving this aim. Note de contenu : - APPLICATION PROCESSES : sheetfed offset lithography - web offset lithography - mini web rotary letterpress - FLEXOGRAPHY : silk-screen - CURE ASSESSMENT - UV LAMPS - FORMULATION - PREPOLYMERS - REACTIVE DILUENTS - PIGMENTS - PHOTOINITIATORS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17051 [article]

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006571	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Cationic uv-cured coatings containing epoxidized soybean oil initiated by new onium salts containing tetrakis (pentafluorophenyl) gallate anion / Haiyan Gu in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 49-52 Titre : Cationic uv-cured coatings containing epoxidized soybean oil initiated by new onium salts containing tetrakis (pentafluorophenyl) gallate anion Type de document : texte imprimé Auteurs : Haiyan Gu, Auteur ; Kangtai Ren, Auteur ; Dustin Martin, Auteur ; Thomas Marino, Auteur ; Douglas C. Neckers, Auteur Année de publication : 2002 Article en page(s) : p. 49-52 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Formulation  Amorceur  anionique  Réticulation  photochimique  Epoxydation  Huile  soja  Corps  gras  végétal  Rayonnement  UV  Durcissement  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Different formulations containing epoxidized soybean oil (ESO) and a commercial cycloaliphatic epoxy resin (UVR6110) were cured by onium tetrakis(pentafluorophenyl)gallate (Gallate) on steel panels. The resulting coatings were clear and their mechanical properties were tested by the Sward hardness test, cross-hatch tape adhesion test and MEK double rub test. The new initiators have the advantage of good solubility, high reactivity, and the production of colorless coatings. The best formulations obtained contain 50% ESO, 50% UVR6110, and 0.5% silwet if sulfonium gallate is used as initiator, and 60% ESO, 40% UVR6110, and 0.5% silwet if iodonium gallate is the initiator. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5667 [article]

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001238	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Fundamental studies on morphology control for latex systems with application to waterborne coatings : the effect of polymer radical mobility in latex particles during polymerization / Jeffrey M. Stubbs in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 938 (03/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 938 (03/2003) . - p. 59-67 Titre : Fundamental studies on morphology control for latex systems with application to waterborne coatings : the effect of polymer radical mobility in latex particles during polymerization Type de document : texte imprimé Auteurs : Jeffrey M. Stubbs, Auteur ; Donald Sundberg, Auteur Année de publication : 2003 Article en page(s) : p. 59-67 Note générale : Bibliogr. Langues : Américain (ame) Tags : Transfert  chaîne  Amorceur  Microscopie  électronique  transmission  Liant  Polymérisation  émulsion  Morphologie  Particule  colloïdale  Latex  Peinture  eau  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : This work reports on the development of composite latex particle morphology in seeded, semicontinuous emulsion polymerization. Previous work has explained particle morphology development in terms of the ability of second stage polymer radicals to diffuse into, or penetrate, the seed particles. This article investigates two separate effects that essentially alter the mobility of the second stage polymer radicals. The first is the initiator type, specifically nonionic versus ionic initiators, and the second is the use of chain transfer agent (CTA). It is shown that ionic initiators make it more likely to obtain core shell morphologies by decreasing the penetration of radicals, but only under a narrow set of conditions. Chain transfer agents, on the other hand, allow for more deviation from core shell morphologies by increasing the penetration of radicals, but significant changes were only observed at the highest concentration of CTA studied. Therefore, both factors are fairly subtle and effects are only observed under specific conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5597 [article]

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000563	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Organotin copolymer binders for self polishing antifouling paints (SPC's) : Performance of SPC A/F paints in relation to polymerization conditions and binder composition / S. Pal in PAINTINDIA, Vol. XLVI, N° 4 (04/1996)

[article]  inPAINTINDIA > Vol. XLVI, N° 4 (04/1996) . - p. 29-34 Titre : Organotin copolymer binders for self polishing antifouling paints (SPC's) : Performance of SPC A/F paints in relation to polymerization conditions and binder composition Type de document : texte imprimé Auteurs : S. Pal, Auteur Année de publication : 1996 Article en page(s) : p. 29-34 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  antisalissure'  Liant  'Copolymère  étain'  'Acrylique  dérivé  copolymère'  Copolymérisation  'Méthacrylique  acide  ester  méthyle'  tributylstannyle'  butyle'  Amorceur  'Peroxyde  organique'  'Composé  azoïque'  Performance  'Protection  Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Effect of different processing variables e.g. organic initiator concentration, polymerisation temperature, monomer combination, monomer ratio on properties of organotin acrylic copolymers have been studied. A series of organotin acrylic copolymer of varying tin content, molecular waight, monomer combination and monomer ratio has been synthesised by copolymerising Tributyl tin methacrylate monomer (TBTM) with Methyl methacrylate (MMA) and MMA/Butyl acrylate (BA) combination. Organic peroxides and azo compounds of varying H-abstracting abilities and half life were employed as initiators. Azo bis isobutyro nitrile (AIBN) initiator has been found to be an effective initiator in synthesis of organotin copolymers with very low level of residual monomers. Polymerisation temperature above 140°C is having a detrimental effect on properties of organotin copolymers. IR spectrometry, atomic absorption spectrometry, Gas liquid chromatography and viscosity measurements were used to evaluate the organotin acrylic polymers. Self polishing co-polymer A/F Paints (SPCs) with varying tin content and volume solids were formulated using these synthesised organotin copolymers. Influence of different processing variables and binder composition on performance and effectiveness of SPC A/F paints have been evaluated by measuring the dry film thickness over a definite interval of time i.e. erosion rate & degree of fouling. It has been found that polishing rate of these SPC A/F paints depends on the ratio of methyl methacrylate & TBTM and on the nature of acrylate monomer used. Ratio of MMA/TBTM is inversely proportional to erosion rate of SPC's. BA/MMA/TBTM based organotin copolymer has faster rate of polishing than MMA/TBTM based copolymers. Note de contenu : - WORK DONE ON SELF POLISHING A/F PAINTS (SPCs) - Major advantages of Self Polishing Copolymer AF paints (SPCs) - EXPERIMENTAL - Self polishing antifouling paints formulations - TEST METHODS - Characterization of copolymers and tributylt in methacrylate (TBTM) monomer - RESULTS AND DISCUSSION - Synthesis of tributyl tin methacrylate monomer (TBTM) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13473 [article]

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006503	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Release of photoinitiator fragments from UV-cured furniture coatings / T. Salthammer in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 856 (05/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 856 (05/1996) . - p. 41-47 Titre : Release of photoinitiator fragments from UV-cured furniture coatings Type de document : texte imprimé Auteurs : T. Salthammer, Auteur Année de publication : 1996 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Peinture  photodurcissable'  Vernis  Utilisation  Bois  Meuble  Durcissement  'Rayonnement  UV'  'Emission  polluant'  Amorceur  'Pollution  intérieur'  'Acrylate  polymère'  'Ester  polymère''Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Radiation cured furniture coatings for indoor use have often been criticized for strong odor. For a better understanding of the emission characteristics, the release of volatile organic compounds from some specially manufactured furniture was studied in 1 m3 climate chambers. Special attention was given to the detection of photoinitiator fragments, which can significantly contribute to the pollution of indoor air. It was shown that the fragmentation products contributed 20-60% to the total emission, which was typically found in a range of 100 μ/m3 to 250 μg/m3 within the testing period of about 600 hr. One main compound was the strongly odorous benzaldehyde that is generated by many applied photoinitiators via α-cleavage. It was also observed that the curing time has a strong effect on the emission potential. Note de contenu : - EXPERIMENTAL : Sample preparation - Chamber tests - Sampling and analysis - RESULTS : Comparison of different curing times : Acrylate coating - Test of furniture : Acrylate coating - Test of furniture : UPE coating Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18482 [article]

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003526	-	Périodique	Bibliothèque principale	Documentaires	Exclu du prêt

UV curing of pigmented high-build wood coatings based on non-air-inhibited unsaturated polyesters / Michael J. Dvorchak in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 842 (03/1995)

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