Novel moisture-cured hyperbranched urethane alkyd resin for coating application / R. B. Naik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 4 (07/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 4 (07/2014) . - p. 575-586 Titre : Novel moisture-cured hyperbranched urethane alkyd resin for coating application Type de document : texte imprimé Auteurs : R. B. Naik, Auteur ; N. G. Malvankar, Auteur ; T. K. Mahato, Auteur ; D. Ratna, Auteur ; R. S. Hastak, Auteur Année de publication : 2014 Article en page(s) : p. 575-586 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides gras Diisocyanate d'isophorone Polyalkydes Polymères ramifiés Polyuréthanes Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : A hyperbranched polyol (HBP) was synthesized using dipentaerythritol as a core material and 2,2-bis(methylol) propionic acid as a chain extender. This was reacted with varying concentrations of soya fatty acid to make hyperbranched alkyd (HBA) resins. The HBA resins containing unreacted hydroxyl groups were reacted with isophorone diisocyanate at NCO/OH ratio of 1.6:1 to make high solid hyperbranched urethane alkyd (HBUA) resins. The excess NCO content in the HBUA resins was used to cure with atmospheric moisture, and thus moisture-cured HBUA coatings were formed. The resins were characterized by FTIR, and 13C NMR spectroscopic analysis. A series of such resins were made using different fatty acid/isocyanate ratios with respect to the hydroxyl groups present in the HBP. The effect of compositions on the mechanical and weathering properties of the cured resins was investigated. It was observed that there was an optimum fatty acid–isocyanate ratio in terms of the requirements of solvent, mechanical and weathering properties of the resin. The requirement of solvents for formulating HBUA coatings is much lower compared to linear alkyd-based coatings. The present study reveals that the moisture-cured HBUA resins can be used as a binder material in the field of low-pollution weather-resistance coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of fatty acid - Synthesis of hyperbranched polyol (HBP) - Synthesis of hyperbranched alkyd (HBA) - Synthesis of hyperbranched urethane alkyd (HBUA) - CHARACTERIZATION : Characterization of resins - Characterization of cured films - RESULTS AND DISCUSSION : FTIR spectroscopy - NMR spectroscopy - Viscosity and volume solid measurement - Gel permeation chromatography (GPC) analysis - Gel content - Mechanical properties - Adhesion strength - Accelerated weathering test DOI : 10.1007/s11998-013-9561-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9561-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21718 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16424	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 719–730 Titre : Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2020 Article en page(s) : p. 719–730 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auto-nettoyage Caractérisation Charges (matériaux) Dioxyde de titane Formulation (Génie chimique) Nanoparticules Photocatalyse Polyalkydes Résistance aux conditions climatiques Revêtements -- Additifs:Peinture -- Additifs Revêtements organiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : Nano-TiO2-dispersed polymeric coatings have been extensively studied in recent years owing to their photocatalytic-induced self-cleaning characteristics. However, durability and long-term retention of self-cleaning performance of such coatings remain a challenge for practical applications. In the present work, we report the self-cleaning properties of nano-TiO2/silicone soya alkyd-based coating formulations comprising 0.5–5 wt% of nanofiller as well as conventional additives of rutile TiO2 and BaSO4. The nanocomposites were prepared by an in situ process involving dispersion of nano-TiO2 in soya oil, soya alkyd synthesis by alcoholic process, followed by silicone modification. The coatings prepared from the nanofiller-dispersed resin showed significant UV radiation-induced hydrophilicity and photocatalytic degradation of methylene blue (MB) solution. A coating formulation with 2 wt% of nano-TiO2 loading showed a decrease in water contact angle from 87° to < 10° after 24 h of UV radiation exposure and a 50% decrease in intensity of the 664-nm absorbance peak of MB solution after 8 h of UV irradiation. Further, Fourier transform infrared spectroscopy in reflectance mode (ATR-FTIR) and thermogravimetric analysis (TGA) studies revealed minimal degradation of the host matrix after 500 h of accelerated weathering studies with retention of self-cleaning characteristics. These results imply that silicone-modified alkyd resin can be a suitable host matrix for combining the requisite properties of self-cleaning, organic contaminant degradation, photocatalytic stability, and weathering resistance for sustainable self-cleaning applications. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Synthesis of silicone soya alkyd/nano-TiO2 resin - Preparation of paint - CHARACTERIZATION METHODS - RESULTS AND DISCUSSION : Photoinduced hydrophilicity and degradation of methylene blue solution - Self-cleaning characteristics Photocatalytic degradation of nanocomposite coating DOI : https://doi.org/10.1007/s11998-019-00253-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00253-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34102 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21734	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1269-1285 Titre : Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2022 Article en page(s) : p. 1269-1285 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères Animaux marins Anticorrosifs Anticorrosion Caractérisation Concentration pigmentaire volumique Epoxydes Essais d'adhésion Formulation (Génie chimique) Pigments inorganiques Revêtements antisalissures Revêtements autostratifiants Revêtements organiques Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : Incompatible polymer blends of epoxy and silicone were used for the preparation of single-coating system having anticorrosive and foul release properties by self-stratifying process. The single-coat application consists of a fixed 20 pigment volume concentration (PVC) anticorrosive bottom coat based on epoxy with a mixture of pigments like iron oxide, barytes, and zinc phosphate, and a fixed 10 PVC hydrophobic topcoat consisting of silicone resin and titanium dioxide pigment. Both the coatings were prepared separately in triple role and ball mill, respectively. Three different coating compositions were prepared by mixing silicone and epoxy coatings in different weight ratios (70:30, 80:20, and 90:10). Required amount of hardener, crosslinker, and catalyst were added to these prepared compositions separately prior to application and were thoroughly mixed and applied on mild steel and glass specimens. The prepared stratified coatings were named as STR-1, STR-2, and STR-3. The formation of self-stratification was confirmed by optical microscopy, FE-SEM, FTIR spectroscopy, and contact angle measurement. The coating systems were evaluated for adhesion, tensile strength, corrosion resistance, pseudobarnacle adhesion properties, and accumulation of foulant studies by immersion of test coupons in seawater. It is confirmed that there exists a most favorable stratified coating composition in terms of silicone and epoxy weight ratios which showed performance enhancement in terms of the hydrophobicity and foul release properties compared to other coating compositions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of epoxy-based anticorrosive coating (bottom coat) and silicone-based fouling release coating (topcoat) - composition for 10 PVC silicone coating - Formulations of stratified fouling release coatings - CHARACTERIZATION METHODS : Physical properties - FTIR spectroscopy - Measurement of contact angle - FESEM study - Electrochemical impedance spectroscopy (EIS) - Investigation of pseudobarnacle adhesion strength - Assessment of foul release property of stratified coatings in seawater - Resistance to corrosion under cathodic protection - Table 1 : The composition for 20 PVC epoxy coating - Table 2 : The composition for 10 PVC silicone coating - Table 3 : Physical properties of stratified coatings - Table 4 : Pseudobarnacle adhesion test of stratified coatings - Table 5 : Experimental details for resistance to cathodic protection DOI : https://doi.org/10.1007/s11998-021-00610-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00610-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38053 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23574	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Role of curing agents on self-stratification behavior of pigmented epoxy resin-chlorinated rubber blend / T. K. Mahato in PAINTINDIA, Vol. LXIV, N° 11 (11/2014)  

[article]  inPAINTINDIA > Vol. LXIV, N° 11 (11/2014) . - p. 61-65 Titre : Role of curing agents on self-stratification behavior of pigmented epoxy resin-chlorinated rubber blend Type de document : texte imprimé Auteurs : T. K. Mahato, Auteur Année de publication : 2014 Article en page(s) : p. 61-65 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc Chloropolymères Dioxyde de titane Epoxydes Oxyde de fer Réticulants Revêtements autostratifiants:Peinture autostratifiante Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : A stratifying coating based on chlorinated rubber and epoxy resin paint blend has been prepared. Chlorinated rubber is pigmented with rutile grade titanium dioxide and epoxy resin is pigmented with red iron oxide. Different types of curing agents on the stratification behavior of pigmented chlorinated rubber/epoxy resin has been studied. Surface tension as well as its polar & disperse component for individual hardener has been determined. Stratification occurs only with polyamide resin hardener, used as epoxy curing agent. Cross section of dried coating film is analyzed under optical microscope, then further characterized by FTIR, HATR, SEM-EDX, X-ray mapping. After stratification, two distinct coating layers are obtained with titanium dioxide pigmented chlorinated at the air interface and iron oxide pigmented epoxy resin towards substrate. Note de contenu : - Preparation of paint - Preparation of stratified paint film - Determination of surface tension - Optical microscope - FTIR Spectroscopy - SEM-EDX-X ray mapping En ligne : https://drive.google.com/file/d/1OZciKvpz_HHJLFX5q-K7Y7YUfhDvspVp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22515 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16696	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 4 / 4)