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Esterification of ethylene glycol and polyethylene glycol modified shellac for high class indutrial finishes / Deepti Shikha in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 31-42 Titre : Esterification of ethylene glycol and polyethylene glycol modified shellac for high class indutrial finishes Type de document : texte imprimé Auteurs : Deepti Shikha, Auteur ; P. K. Kamani, Auteur Année de publication : 1999 Article en page(s) : p. 31-42 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Vernis  Liant  'Gomme  laque'  modifié'  Ethane-1,2-diol  'Ethylène  oxyde  polymère'  Estérification  Formulation  'Propriété  mécanique'  Feuil  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Shellac, a natural resin in which India holds the monopoly by producing about 80% of the world's production, is very well known for some of its properties. Of course there are some drawbacks associated with shellac which have limited their application. In order to remove these drawbacks of shellac varnishes, shellac-glycol compounds from shellac, ethylene-glycol, and polyethylene glycols were prepared. Phosphorous penta-oxide has been used as the catalyst. Two series of compounds, first containing shellac-ethylene glycol and the second shellac-ethylene and polyethylene glycol mixture, were prepared by esterifying with various monobasic acids from safflower oil, isomerised linseed oil, dehydrated castor oil, tung oil, rosin and rosin modified products. Each series comprises of eleven samples (Twenty two in all). Varnishes from these esterified products were prepared to study and to evaluate the film properties. These varnishes were then tested according to I.S. Specifications. It was observed that tung oil fatty acid varnishes exhibited the best results followed by the varnishes from dehydrated castor oil and isomerised linseed oil fatty acids. Safflower oil fatty acids varnishes have also been found satisfactory. Varnishes from rosin and rosin modified products were the least satisfactory. Both the series yielded products of almost parallel film forming properties such as baking period, hardness, flexibility, resistance to various chemicals, etc. Out-door exposure test of the films had also been carried out. Furthermore, the results of exposure test have shown that the compositions containing fatty acids possess better weather resistance than those having rosin or rosin modified products. The modified shellac is understood to have commercial application in the present scenario. Note de contenu : - HISTORY - STRUCTURE - PREPARATION : Preparation of shellac-glycol compounds (shellac etylene-glycol compound, shellac-polyethylene glycol compound) - Esterification of shellac-glycol componds with various acids - Preparation of varnishes and their evaluation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12972 [article]

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Primer and enamel compositions based on new type of styrenated alkyds / P. D. Sathe in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p.43-50 Titre : Primer and enamel compositions based on new type of styrenated alkyds Type de document : texte imprimé Auteurs : P. D. Sathe, Auteur ; Bhalchandra B. Gogte, Auteur Année de publication : 1999 Article en page(s) : p.43-50 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : A new type of styrened alkyds have been synthetised using substantial proportion of styrene (30 to 50%), a lower percentage of polyols and anhydrides and moderate proportion of oil and rosin. A new catalyst, styrocatalyst has been developed in our laboratory dor this synthesis. Various paint compositions like enamel, metal primer, wood primer and cement primer have been described in a two pack system. These compositions have excellent drying, hardness, durability and gloss characteristics. The resistance of films of these primers and enamels to water, alkali detergent and hydro chloric acid solutions is good to excellent. The resistane to sulphuric acid and nitric acid needs improvement. There is a net saving of 15 to 20 % in raw material cost of these paints. Note de contenu : EXPERIMENTAL : Formulation of synthetic enamels - Formulations of primers based of styrenated alkyds - Physico-chemical and film properties of primer and enamel composition Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12973 [article]

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Aspects of pigment dispersion - A review / Pramod Raman Natuvetty in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 53-58 Titre : Aspects of pigment dispersion - A review Type de document : texte imprimé Auteurs : Pramod Raman Natuvetty, Auteur Année de publication : 1999 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Fabrication  Broyage  Pigment  Dispersion  'Article  synthèse' Index. décimale : 667.9 Revêtements et enduits Résumé : Experience shows that successful pigment dispersion is as important to the optical and protective properties of a coating as the correct selection and proportions of the constituent raw materials. A study of pigment dispersion involves an understanding of the formation and properties of the solid/liquid interface. In the early stages of the process the solid/air interface is replaced by one between the solid and liquid. The pigment powder consists of aggregates/agglomerates of small particles and mechanical work is performed in dispersing particles into a liquid. The forces that exist at the interface determine the ease with which the process can be brought about, once dispersed the particles are free to move in their new environment and flocculation is prevented by various chemical and physical processes, all of which relate to the character of the solid/liquid interface. It is not surprising therefore that studies of these interfaces form an integral part of our understanding of the dispersion process, and of those aspects of pigment performance that are dependent on the state of dispersion. Note de contenu : - PHENOMENON CALLED DISPERSION : Wetting - Grinding (dipersion) equipment - CONCLUSION : Stabilisation - Influencing factors - REQUIREMENTS DOR STABLE PIGMENT DISPERSION - EVALUATION OF DEGREE DISPERSION - INFLUENCE OF PIGMENT DISPERSION ON PAINT PROPERTIES Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12974 [article]

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Principles of TiO2 product selection : Pigments and dispersions / Robert M. Hopkins in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 63-66 Titre : Principles of TiO2 product selection : Pigments and dispersions Type de document : texte imprimé Auteurs : Robert M. Hopkins, Auteur Année de publication : 1999 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Pigment  minéral'  'Titane  Oxyde'  Fabrication  Distribution  'dimension  particule'  'Traitement  surface'  Dispersion  'Propriété  optique'  Durabilité  Peinture  TiO2 Index. décimale : 667.9 Revêtements et enduits Résumé : Titanium dioxide (TiO2) is the most important white pigment produced in the wordl, due to its high refractive index and relative purity, which create opacity and whiteness. Refractive index is a fundamental property associated with crystalline structure. Titanium dioxide has its highest opacifying potential in its rutile form, which is its most atomically dense state. However an optimum crystal size, a narrow particle size distribution and good dispersion in the application are all essential if its full potential is to be realized. Note de contenu : - Back to basics - Particle size distribution - Surface treatment - Dispersion - Correct product selection - Gloss - Exterior durability - Dispersibility Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12979 [article]

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Low binder pigment concentrates / P. M. Akre in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - P. 69-74 Titre : Low binder pigment concentrates Type de document : texte imprimé Auteurs : P. M. Akre, Auteur Année de publication : 1999 Article en page(s) : P. 69-74 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Formulation  Pigment  Concentrat  Liant  Adjuvant  Dispersant  'Agent  surface'  'Peinture  eau' Index. décimale : 667.9 Revêtements et enduits Résumé : Paint manufacturers are increasingly searching for ways and means of optimising their productions process economically and enhance customised service to customers. Low binder pigments concentrates have proved successful towards the concept of colorant and bases for instant tinting. It is specifically developed for the complete dispersion in aqueous and non-aqueous system. The present article reviews the art and science of colorant preparation containing minimum amount of binders ; suitable for both water based as well as solvent based systems. Note de contenu : - Stabilising moiety - Anchoring moiety - Polymeric surfactant stuctures - "Comb" type structure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12980 [article]

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Acrylic dispersants / V. Kumar in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 77-80 Titre : Acrylic dispersants Type de document : texte imprimé Auteurs : V. Kumar, Auteur Année de publication : 1999 Article en page(s) : p. 77-80 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Adjuvant  Dispersant  'Acrylique  dérivé  polymère' Index. décimale : 667.9 Revêtements et enduits Résumé : Dispersants are one of the most important additives used in paint industry to keep pigment in dispersed form in resin and to avoid settling. Nowadays acrylic dispersants are used more than natural dispersants because of their ability to reduce mill base viscosity to achieve higher pigmentation and to retain colour of pigments. Note de contenu : - Preparation - Mechanism - Selection of dispersant - Advantages - Applications Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12981 [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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Surfactants in inks and coatings / David Fishman in PAINTINDIA, Vol. XLIX, N° 6 (06/1999)

[article]  inPAINTINDIA > Vol. XLIX, N° 6 (06/1999) . - p. 111-116 Titre : Surfactants in inks and coatings Type de document : texte imprimé Auteurs : David Fishman, Auteur Année de publication : 1999 Article en page(s) : p. 111-116 Langues : Anglais (eng) Tags : 'Matériau  revêtement'  Peinture  Encre  Adjuvant  'Agent  surface' Index. décimale : 667.9 Revêtements et enduits Résumé : It's generally know that surfactants are "surface active agents". That is, these are chemicals that reduce the surface energy of a material to which they are added. In doing this, surfactants also help that material wet and spread out over a surface of higher ernergy. Note de contenu : - Surfactant types - Surfactant in pigment dispersions - Surfactant in water-based inks - Surfactant use in clear overprint coatings - Surfactant use in polymers for water-based inks and coatings - Miscellaneous applications - Surfactant selection - Surfactant suppliers - Surfactant growth/ink growth Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12983 [article]

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