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Initiators for water-based acrylate emulsion polymerizations / Lea L. Anderson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 855 (04/1996)
[article]
Titre : Initiators for water-based acrylate emulsion polymerizations Type de document : texte imprimé Auteurs : Lea L. Anderson, Auteur ; Wilfried M. Brouwer, Auteur Année de publication : 1996 Article en page(s) : p. 75-79 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amorceurs (chimie)
Polyacryliques
Polymérisation
Revêtements en phase aqueuse:Peinture en phase aqueuseTags : 'Amorceur radicalaire' Perester 'Hydroperoxyde organique' 'Activité amorceur' 'Polymérisation rédox' 'Copolymérisation émulsion' Terpolymérisation Latex 'Acrylate butyle copolymère' 'Styrène 'Vinylique acétate 'Méthacrylate de méthyle 'Méthacrylique acide 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Traditionally persulfates have been used as initiators in redox water-based polymerization systems. While persulfates are still used, the use of organic peroxides has increased during the past decade. This paper summarizes work which shows that organic peroxides can be used as highly effective monomer scavengers to reduce the levels of unreacted residual monomer in a latex. In addition, organic peroxides can be used in place of persulfates for initiating a redox polymerization and offer some advantages over persulfates. Note de contenu : - Styrene/n-butyl acrylate (40:60) latex
- Vinyl acetate/n-butyl acrylate/methacrylic acid (83:15:2) latex
- N-butyl acrylate/methacrylate/methacrylic acid (52:46:2) latex
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18336
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 855 (04/1996) . - p. 75-79[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003515 - Périodique Bibliothèque principale Documentaires Disponible 003525 - Périodique Bibliothèque principale Documentaires Exclu du prêt Microgel emulsions for low VOC thermosetting industrial coatings / Pradeep T. Gadekar in PAINTINDIA, Vol. XLVII, N° 9 (09/1997)
[article]
Titre : Microgel emulsions for low VOC thermosetting industrial coatings Type de document : texte imprimé Auteurs : Pradeep T. Gadekar, Auteur ; Sandeep. V. Magdum, Auteur Année de publication : 1997 Article en page(s) : p. 36-44 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture eau' émulsion' Liant 'Méthacrylate polymère' 'Acrylate 'Méthacrylique acide Microgel Index. décimale : 667.9 Revêtements et enduits Résumé : In the present research work, acrylic microgel emulsions with hydroxyl functionality were developed by using multifunctional monomers i.e. ethylene glycol dimethacrylate (EGDMA) and glycidyl methacrylate (GMA). All these emulsions were characterised and compared with conventional hydroxyl functional acrylic emulsions (plain emulsions). Hexamethoxymethylmelamine (HMMM) was used as an external crosslinker. These emulsions were further used for the development of low Volatile Organic Compounds (VOCs) thermosetting high performance industrial coatings. The results show that the microgel has lots of promises for low VOC thermosetting industrial coatings. Note de contenu : - AN APPROACH TO THE DEVELOPMENT OF HYDROXYL FUNCTIONAL EMULSIONS
- EXPERIMENTAL WORK-EMULSIONS
- PREPARATION OF PLAIN EMULSIONS
- PREPARATION OF MICROGEL EMULSIONS
- CHARACTERISATION OF EMULSIONS
- EXPERIMENTAL WORK-PREPARATION OF THERMOSETTING COATINGS
- PREPARATION OF PRIMER
- PREPARATION OF TOP COAT
- APPLICATION AND CURING SCHEDULE FOR PRIMER AND TOP COAT
- CHARACTERISATION OF PAINTS - Primer and paint properties - Dry film properties - Study on accelerated weathering conditions
- RESULTS AND DISCUSSIONS - Characterisation of emulsions - Coating properties of composite system of one coat primer and one coat top coat - Accelerated weathering test of paint composite system based on plain and microgel emulsions - Chemical resistancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13315
in PAINTINDIA > Vol. XLVII, N° 9 (09/1997) . - p. 36-44[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006467 - 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]
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
in PAINTINDIA > Vol. XLVI, N° 4 (04/1996) . - p. 29-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006503 - Périodique Bibliothèque principale Documentaires Disponible Spray drying of low-Tg acrylic dispersions / M. Uminski in SURFACE COATINGS INTERNATIONAL, Vol. 81, N° 11 (11/1998)
[article]
Titre : Spray drying of low-Tg acrylic dispersions Type de document : texte imprimé Auteurs : M. Uminski, Auteur ; L. M. Saija, Auteur Année de publication : 1998 Article en page(s) : p. 557-560 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Méthacrylate méthyle polymère' 'Acrylate butyle 'Méthacrylique acide 'Polyélectrolyte Latex Préparation 'Polymérisation émulsion' radicalaire' 'Dispersion aqueuse' 'Séchage pulvérisation' 'Relation mise en œuvre propriété' 'Dimension particule' 'Particule micronique' monodispersée' 'Etude expérimentale' core shell' Index. décimale : 667.9 Revêtements et enduits Résumé : Les poudres acryliques à écoulement libre et à basse température de transformation à l'état vitreux sont fabriqués par le séchage par atomisation des dispersions aqueuses. Grâce à la structure spécifique des particules de la dispersion polymère obtenues par la réaction en deux étapes de polymerisation en émulsion, on saurait éviter l'agglomération pendant la période de stockage. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16728
in SURFACE COATINGS INTERNATIONAL > Vol. 81, N° 11 (11/1998) . - p. 557-560[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14297 - Périodique Bibliothèque principale Documentaires Disponible The role of surfactant on the film formation of latex polymers / P. Nagarajan in PAINTINDIA, Vol. XLVI, N° 2 (02/1996)
[article]
Titre : The role of surfactant on the film formation of latex polymers Type de document : texte imprimé Auteurs : P. Nagarajan, Auteur ; C. K. Mital, Auteur ; M. K. Trivedi, Auteur Année de publication : 1996 Article en page(s) : p. 19-24 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Latex 'Réseau polymère interpénétré' 'Méthacrylate méthyle polymère' 'Acrylate butyle 'Méthacrylique acide 'Système ternaire' 'Formation film' 'Agent surface' 'Propriété 'Tension superficielle' Index. décimale : 667.9 Revêtements et enduits Résumé : Two different latex interpenetrating polymer networks (LIPNs), comprising of polyacrylate (methyl methacrylate: n-butyl acrylate: methacrylic acid-43:57: 2.5) as seed and second polymer as polystyrene and polymethyl methacrylate, having a difference in hydrophilicity have been prepared. Surface tension measurements, were carried out to demonstrate the difference in adsorption equilibria of the anionic surfactant, sodium dodecyl sulphate on the different latex particles, with change in pH. the films were cast at different pHs, and it was found that the film of styrene based LIPN at a low pH (3.3), yielded translucent film while transparent films were also obtained from styrene based LIPN at a higher pH of 9, neutralized with NaOH. The higher strength of the latex films, obtained at the pH of 9 than those obtained at pH 3.3 of the styrene based LIPNs, indicates that the reduction in the polymer-water interfacial tension enhances the coalescence. It has been demonstrated clearly by the experimental evidence, that adsorption of surfactant on polymer, in styrene based latexes and the exudation of the surfactant in MMA based latexes, results in major difference in the optical clarity of the latex films. Note de contenu : - Preparation of LIPNs
- Surface tension measurements
- Transparency of the films
- Tensile strength
- Spectral measurementsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13390
in PAINTINDIA > Vol. XLVI, N° 2 (02/1996) . - p. 19-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006500 - Périodique Bibliothèque principale Documentaires Disponible