Effect of molecular weight of polycarboxylate surfactant on properties of concentrated aqueous titanium dioxide dispersions / Prasad M. Sangli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 393-400 Titre : Effect of molecular weight of polycarboxylate surfactant on properties of concentrated aqueous titanium dioxide dispersions Type de document : texte imprimé Auteurs : Prasad M. Sangli, Auteur ; Sumit Chaudhary, Auteur ; Elvina Rose, Auteur ; Ritesh A. Bhavsar, Auteur Année de publication : 2020 Article en page(s) : p. 393-400 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Dispersions et suspensions Mouillage (chimie des surfaces) Pigments Poids moléculaires Polycarboxylates Rhéologie Surfactants Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : Universal colorants used for point-of-sale tinting or dealer tinting system usually have titanium dioxide dispersion as one of the essential colorants to adjust “chroma” of the shade. It is imperative that this colorant exhibits optimum performance in water-based and solvent-based products. The paper focuses on the effect of varying molecular weight of polycarboxylate-based surfactants on the properties of the aqueous dispersion. Note de contenu : - EXPERIMENTAL : Materials - Pigment dispersion - Rheological characterization - Wetting and surface tension - Evaluation of reducing strength - RESULTS AND DISCUSSION : Reducing strength - Rheology - Powder wettability and surface tension measurements DOI : https://doi.org/10.1007/s11998-019-00285-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00285-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33990 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21658	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Emulsion polymerization & its applications : a brief review / Harish S. Ajmera in PAINTINDIA, Vol. LXXII, N° 4 (04/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 4 (04/2022) . - p. 55-67 Titre : Emulsion polymerization & its applications : a brief review Type de document : texte imprimé Auteurs : Harish S. Ajmera, Auteur ; Ritesh A. Bhavsar, Auteur Année de publication : 2022 Article en page(s) : p. 55-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Encapsulation Formation de film Opacifiants Polymères en émulsion Polymères organiques-inorganiques Polymérisation en émulsion Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Emulsion polymer is one of the important components of water based paints which provides mechanical, chemical and durability properties to it. This article provides a general overview on the emulsion polymers, techniques to prepare and their end applications. An introduction to the basic concepts of emulsion polymers was discussed, followed by a description of the various production processes and characterization methods. The classes of emulsion polymers were surveyed, and the commercial technologies and potential future uses discussed. The main objective of this review article is to describe the use of latex coatings and their futuristic technologies for the development of next generation waterbased coatings. Note de contenu : - GENERAL ASPECT : Latex composition - Latex preparation - Latex characterization - USE OF EMULSION POLYMERIZATION FOR DEVELOPING SPECIALTY PRODUCTS : A. Encapsulation of organic, inorganic, liquid/oil material - B. Organic-inorganic hybrid emulsion - C. Opaque emulsion - D. Bitumen emulsion - FUTURE TECHNOLOGIES IN EMULSION POLYMERS : 1. Surfactant free emulsion - Bio-based emulsion - Hollow film forming opacifier - Antimicrobial emulsion - Colored emulsion En ligne : https://drive.google.com/file/d/1TbLQ0glGlnlo318ew2ps54PKBvidgQlr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37746 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23453	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Implication of coalescing agents and associative thickeners on rheology of water borne coatings / Ritesh A. Bhavsar in PAINTINDIA, Vol. LXII, N° 6 (06/2012)

[article]  inPAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p. 49-54 Titre : Implication of coalescing agents and associative thickeners on rheology of water borne coatings Type de document : texte imprimé Auteurs : Ritesh A. Bhavsar, Auteur ; Vaibhav J. Dave, Auteur ; Randhirsinh Parmar, Auteur Année de publication : 2012 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coalescence (Sciences physiques) Epaississants Latex Polyacryliques Polymères en émulsion Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Screening specific concentration of ingredients is a difficult job while formulating a latex paint. It is the composition of binder and various ingredients such as pigments, coalescing agents, thickeners, surfactants, wetting agents, etc. The properties of paint are highly dependent upon the property of binder and its interactions with other ingredients. Rheology is one of the important property for paint, responsible for its performance during manufacture, storage and applications. In this study we discuss the theological interactions of acrylic emulsion (AE) with coalescing agents and associative thickeners to screen these ingredients for the paint formulation. Two hydrophobic coalescing agents and three types of HEUR (hydrophobically modified ethoxylated urethane thickener) and HASE (hydrophobically modified alkali swellahle emulsion thickeners) classified as high, mid and low shear thickener with different concentration are used in this study. Flow curve, 31TT (Three Interval Thixotropy Test), Oscillatory amplitude sweep test (AS) are carried out to study the influence of these ingredients on rheology. She viscosity increases as the concentration of coalescing agent and associative thickener increases. The mechanism of interaction and efficiency of ingredients with acrylic emulsion is discussed. Note de contenu : - EXPERIMENTAL : Materials and methods - Rheological measurements - RESULTS AND DISCUSSION : Effect of coalescing agent - Interactions of associative thickener with acrylic emulsion Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15650 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14083	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigating propensity of roller spatter during application of water-based architectural paints: effect of thickeners and volume solids / Sumit Chaudhary in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 413-425 Titre : Investigating propensity of roller spatter during application of water-based architectural paints: effect of thickeners and volume solids Type de document : texte imprimé Auteurs : Sumit Chaudhary, Auteur ; Ritesh A. Bhavsar, Auteur ; Venkata Gopal Reddy Chada, Auteur Année de publication : 2020 Article en page(s) : p. 413-425 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère styrène acrylique Epaississants Résistance aux éclaboussures Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : During roll coating application of water-based architectural paints, fibers are formed between roller and substrate. These fibers progressively thin and break up into several tiny droplets leading to the wastage of paints. This defect is widely known as spattering. In the current study, the propensity to spatter in fully formulated mid pigment volume concentration water-based architectural paints based on varying the type of thickeners, namely a combination of cellulosic with clay, cellulosic, and hydrophobically modified poly acetal/ketal polyether (HMPAPE), at similar and varying volume solids is investigated. The spatter tendency of paint is qualitatively assessed using ASTM D4707. Also, a new approach to quantify the spread area of spattered droplets is developed by thresholding-based image segmentation using an image processing toolbox of Mathematica. This newly developed quantitative approach will greatly help the formulator to better differentiate between formulations. Rheological tests, namely viscosity curve, amplitude sweep, frequency sweep, and first normal stress difference test, are carried out to unravel the flow and viscoelastic properties of paints in depth. An in-house custom-built fiber drawing device on a contact angle drop shape analyzer instrument is fabricated to study the extensional properties of paints. At the same volume solids, the paint based on a combination of cellulosic with clay thickener spatters the most, while the paint based on HMPAPE thickener spatters the least. This is mainly attributed to the chemistry, molecular weight, and thickening mechanism of thickeners. Eventually, a reliable correlation is established between observed spatter and the frequency-dependent elastic modulus outside the linear viscoelastic range at the same and varying solids for paints based on the different types of thickener. This correlation will help chemists to quickly screen formulations to minimize the spattering during roll coat application, thus saving time, cost, and manpower. Note de contenu : - EXPERIMENTAL : Chemicals and materials - Preparation of water-based paint - Determination of spatter resistance ASTM D4707 - Quantification of spatter droplets through image processing - Rheological characterization - RESULTS AND DISCUSSIONS : Effect of type of thickeners/rheology modifiers on spatter resistance of water-based paints - Influence of volume solids on spatter resistance of paints DOI : https://doi.org/10.1007/s11998-019-00287-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00287-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33992 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21658	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint / Ritesh A. Bhavsar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 919-930 Titre : Investigation of effect of type of pigment/extender on the stability of high pigment volume concentration water-based architectural paint Type de document : texte imprimé Auteurs : Ritesh A. Bhavsar, Auteur ; Avinash Sardesai, Auteur Année de publication : 2022 Article en page(s) : p. 919-930 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charges (matériaux) Concentration pigmentaire volumique Diluants Dispersions et suspensions -- Stabilité Floculation Pigments inorganiques Potentiel zeta Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This article elucidates the effect of type of pigment/extenders viz. titanium dioxide (TiO2), magnesium silicate (steatite), calcium carbonate, dolomite, precipitated sodium magnesium aluminosilicates, hydrated and calcined aluminum silicates (kaolin) when used alone or in combination in the paint dispersions on their sedimentation stability. Accelerated heat age stability test was conducted as per ASTM D 1849. Wettability of pigment extenders were measured in terms of their contact angle using Washburn technique. Rheology viscosity curve and oscillatory amplitude sweep test are carried out to depict the structural properties, more precisely the extent of flocculation in the paint dispersion. From rheology viscosity curve, extent of residual flocculation is determined using Asbeck extrapolation method. Extent of total flocculation in the paint dispersion is estimated from cohesive energy density (Ec) using oscillatory amplitude sweep test. Energy of separation of particles in flocs (Esep) is also determined using yield point measurement. Attempt was made to correlate extent of flocculation present in paint dispersion with settling and syneresis observed during accelerated heat age stability test. It is observed that, the paint dispersions based on only TiO2, only hydrous kaolin and only precipitated sodium magnesium aluminosilicates are found to be quite stable whereas the dispersions based on only magnesium silicates and only calcined kaolin are found to be unstable. Paint dispersions based on carbonate extenders show syneresis and soft settling which is easily mixable. From the rheological study, it is identified that Ec is the most crucial parameter that correlates very well with the accelerated heat age stability test results of paint dispersion. Note de contenu : - EXTENT OF FLOCCULATION : Investigation of degree of residual flocculation using Asbeck extrapolation method - Energy of separation between the particles in a flocs (E sep) - Cohesive energy density (E c) - EXPERIMENTAL WORK : Materials - Preparation of dispersion - Characterization - RESULTS AND DISCUSSION : Effect of type of pigment/extenders on the stability of high PVC interior paint - Powder wettability - Rheological characterization - Effect of varying ratio of unstable to stable pigment and extenders on the stability of Paint-1 - Table 1 : Physico-chemical properties of pigments and extenders used in paint dispersion - Table 2 : Key formulation ingredients of high PVC interior paint-1 and their respective experiments with individual pigment/extender at same volume solid content - Table 3 : Summary of pH, zeta potential, stormer viscosity of paint dispersions before and after accelerated heat age stability test - Table 4 : Material constant and powder contact angle with DI water and surfactant solution - Table 5 : Infinite shear viscosity (η∞) and the extent of residual flocculation (m) as computed from Asbeck model, yield point (τ0) and energy of separation of particles in floccs (Esep), viscoelastic parameter G′ and critical strain (Υc) and cohesive energy density (Ec) is summarized DOI : https://doi.org/10.1007/s11998-021-00568-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00568-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38086 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23605	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Paint and coatings : thinking beyond decoration and protection for betterment of society and human beings / Ritesh A. Bhavsar in PAINTINDIA, Vol. LXV, N° 10 (10/2015)  

Permalink

Rheological approach to select most suitable associative thickener for water-based polymer dispersions and paints / Ritesh A. Bhavsar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

Permalink

Rheological studies of automotive putty filler and correlation with their performance characteristics / Dhrubjyoti Kumar in PAINTINDIA, Vol. LXIII, N° 10 (10/2013)

Permalink

---

1 (1 - 8 / 8)