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Emerging trends in rheological modifications of latex paints / Girish A. Bhagwat in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 41-52 Titre : Emerging trends in rheological modifications of latex paints Type de document : texte imprimé Auteurs : Girish A. Bhagwat, Auteur Année de publication : 1997 Article en page(s) : p. 41-52 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  eau'  émulsion'  Adjuvant  Epaississant  'Propriété  rhéologique' Index. décimale : 667.9 Revêtements et enduits Résumé : Cellulosic thickeners have been used as Industry Workhorse for thickening latex paints, since many years. However, latex paints thickened with cellulosics could not provide paint films, which are richer in looks and have high aesthetic appeal. Continuous research in order to overcome these deficiencies in cellulosics, led to the evolution of new generation thickeners termed as Associative Thickeners. These thickeners have out-performed cellulosics in many aspects and have been well accepted by the industry. Various aspects which resulted in changing the trend from use of cellulosic to associative thickeners are reviewed in this paper. Also, factors governing the performance of the above thickeners and latex paints based on them are discussed at length. Note de contenu : - ROLE OF THICKENERS IN LATEX PAINTS - FORMULATING LATEX PAINTS WITH CELLULOSIC THICKENERS - TYPES OF CELLULOSIC THICKENERS - RHEOLOGY OF LATEX PAINTS BASED ON CELLULOSIC THICKENERS - PARAMETERS DETERMINING RHEOLOGY OF LATEX PAINTS BASED ON CELLULOSIC THICKENERS - Structural parameters of the thickeners - Degree of substitution - Degree of polymerisation - Susceptibility towards enzymatic degradation - Susceptibility to redox substances - Formulating constants and other ingredients - WEAKNESSES OF CELLULOSIC THICKENERS - REFORMULATING LATEX PAINTS WITH ASSOCIATIVE THICKENERS - TYPES OF ASSOCIATIVE THICKENERS - Alkali swellable associative thickeners-ASA - Urethane based non-ionic associative thickeners-HEUR - Hydrophobically modified hydroxy ethyl cellulose-HMHEC - MECHANISM OF ASSOCIATION THICKENING - RHEOLOGY OF LATEX PAINTS BASED ON ASSOCIATIVE THICKENERS - PARAMETERS AFFECTING RHEOLOGY OF LATEX PAINTS BASED ON ASSOCIATIVE THICKENERS - Structural parameters of the thickeners - Formulation constants and other ingredients - Latex and its particle size - Surfactants - Pigments and co-solvents - BENEFITS OF ASSOCIATIVE THICKENERS OVER CELLULOSICS - SOME REALITIES ABOUT REFORMULATING WITH ASSOCIATIVE THICKENERS - COMPARISON OF VARIOUS PAINT PROPERTIES AS A FUNCTION OF THE THICKENERS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13295 [article]

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Film characteristics of novolac based epoxy ester films-II / Madhu Bajpai in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 53-58 Titre : Film characteristics of novolac based epoxy ester films-II Type de document : texte imprimé Auteurs : Madhu Bajpai, Auteur ; Arti Sharma, Auteur Année de publication : 1997 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Liant  'Epoxyde  résine'  Novolaque  'Ester  polymère'  'Corps  gras  végétal'  'Nicotiana  tabacum'  'Propriété  physique'  chimique'  mécanique'  Feuil  Solanaceae  Dicotyledones  Angiospermae  Spermatophyta Index. décimale : 667.9 Revêtements et enduits Résumé : Tobacco seed oil fatty acids were used to esterify novolac based epoxy resins. The novolac epoxy resins werepreparedby using three different ratios ofphenol to formaldehyde. The films of prepared epoxy esters with different oil lengths, were evaluated for various performance tests and were compared with those of bisphenol-A based epoxy resin. All the films dried faster and took a maximum of 13 hrs to dry tack free. Epoxy esters prepared from novolac epoxy resins having higher phenol to formaldehyde ratios showed better scratch hardness than those with lower ratios. Also, epoxy esters with shortest oil length possessed best scratch hardness. All the films were highly flexible. The studies showed that alkali resistance of epoxy esters is slightly better than water resistance. The water resistance increased with the increase in the oil length and also with increase in the phenol to formaldehyde ratio in novolac epoxy resins. In the case of alkali resistance, it increased with the increase in phenol - formaldehyde ratio and it decreased with the increase in oil length. The acid resistance of all the samples were excellent. Note de contenu : - EXPERIMENTAL - Preparation of novolac resins - Preparation of epoxy resins - Preparation of epoxy esters - Preparation of coating samples - Evaluation of film characteristics - RESULTS AND DISCUSSION - Drying time - Scratch hardness - Flexibility - Water resistance - Alkali resistance - Acid resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13312 [article]

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Photochromic inks : Shedding light on formulating this specialty item / Rich Podhajny in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 77-78 Titre : Photochromic inks : Shedding light on formulating this specialty item Type de document : texte imprimé Auteurs : Rich Podhajny, Auteur Année de publication : 1997 Article en page(s) : p. 77-78 Langues : Anglais (eng) Tags : Encre  Photochromisme  Formulation Index. décimale : 667.9 Revêtements et enduits Note de contenu : - PHOTOCHROMIC USE AND APPLICATIONS - PHOTOCHROMIC MATERIALS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13313 [article]

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Aluminium pigments for waterborne coatings / Chem Impex Usha Pvt. Ltd. in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 106-109 Titre : Aluminium pigments for waterborne coatings Type de document : texte imprimé Auteurs : Chem Impex Usha Pvt. Ltd., Auteur Année de publication : 1997 Article en page(s) : p. 106-109 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Note de contenu : - PRODUCT DESCRIPTIONS - FORMULATING GUIDELINES - SAMPLE FORMULATIONS - STABILITY TESTING - Accelerated stability test Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13314 [article]

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