Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives / Ronald T. Obie in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 40-59 Titre : Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives Type de document : texte imprimé Auteurs : Ronald T. Obie, Auteur ; Cameron R. Anderson, Auteur Année de publication : 2022 Article en page(s) : p. 40-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Séchage Adhésion Essai de dureté Essais dynamiques Revêtement -- Séchage Revêtement -- Séchage:Peinture -- Séchage Revêtement en phase solvant Revêtements en phase aqueuse Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Characterization of dry and cure is very important in the development of paints, coatings, and adhesives. It can be challenging to assess dry and cure of these products on a quantitative, non-biased basis. Although there are many different techniques utilized to assess drying, curing, and performance, some are often qualitative at best. It would be useful to have quantitative techniques available to access these properties. In this paper, we introduce a novel automated dynamic dry time recorder (ADDTR) device that measures dry and cure of coatings similar to mechanical dry time recorders that meet ASTM Method D 5895. The novel device is capable of recording and graphically displaying the coating drying profile as it dries so that drying time events may be easily identified, archived, and analyzed, even for clear coatings. Such analysis allows easy and quantitative comparison between different coating systems, chemistries, driers, etc. In certain configurations, the tester may also be utilized as a hardness, toughness, and adhesion tester. Note de contenu : - Drying time determination - Solvent-based coatings - Drying time determinationa - Water-based coatings - Hardness testing of films En ligne : https://drive.google.com/file/d/1jS37p5GhUTprXBX57mpbyIctul1kid2w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37244 [article]

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Dual-curable coatings obtained from multi-functional non-isocyanate polyurethane oligomers / H. R. Asemani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1393-1407 Titre : Dual-curable coatings obtained from multi-functional non-isocyanate polyurethane oligomers Type de document : texte imprimé Auteurs : H. R. Asemani, Auteur ; V. Mannari, Auteur Année de publication : 2022 Article en page(s) : p. 1393-1407 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Décomposition (chimie) Dureté (matériaux) Impédancemétrie Matériaux -- Propriétés fonctionnelles Oligomères Poids moléculaires Polyuréthanes Réticulation à l'humidité Revêtements -- Propriétés mécaniques Revêtements organiques Revêtements sans isocyanates Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : The growing concerns and impending regulations on the usage of monomeric isocyanates in the production of polyurethane resins have led to the introduction of alternative non-isocyanate polyurethane (NIPU) systems. Although two-component NIPU coatings based on the reaction of cyclic carbonates and aliphatic amines have emerged as a promising option, they are still associated with two significant drawbacks: lower crosslinking densities due to reduced functionality of the oligomers and low ambient-temperature reactivity. This study reports the utilization of a hybrid approach to address these drawbacks. Amine-functional NIPU oligomers (NI-PUPA) were synthesized by the reaction of cycloaliphatic amine functional compounds and multi-functional cyclic carbonates in an excess amine molar ratio. After mixing the NI-PUPAs with (3-glycidyloxypropyl) trimethoxysilane (GPTMS), a dual-curable coating could be achieved by ambient curing of amines and epoxies and moisture curing of alkoxy silanes. A comparative experimental design was implemented to evaluate the effect of an additional curing mechanism. The results revealed that the additional moisture curing led to faster ambient curing, faster development of properties, enhanced flexibility even at higher crosslinking densities, and better corrosion resistance. Such advancement could facilitate the future implementation of NIPUs in high-performance ambient-curing coating applications. Note de contenu : - EXPERIMENTAL : Materials - Methods - Testing, characterization, and evaluation - RESULTS AND DISCUSSION : Characterization of NI-PUPAs - Curing characterization - Cured film properties - Table 1 : Molecular weights obtained from GPC analysis in comparison with theoretical values and the values obtained by amine value titration Table 2 : The tack-free and through-dry times of NIPU coatings based on ASTM D5898 standard - Table 3 :Konig pendulum hardness development for NIPU coatings over 7 days of curing time (method: ASTM D4366; unit: number of oscillations) - Table 4 :MEK double-rub development for NIPU coatings over 7 days of curing time - Table 5 :Properties of NIPU coatings after 7 days of curing at ambient conditions - Table 6 :Impedance at low frequencies and pore resistance values obtained from EIS analysis - Table 7 : Decomposition temperatures and residual wt.% obtained by the analysis of TGA thermograms DOI : https://doi.org/10.1007/s11998-022-00614-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00614-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38278 [article]

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Low viscosity hardeners gives superior aesthetics even at high application temperatures / Sachin Kamble in PAINTINDIA, Vol. LXXI, N° 2 (02/2021)  

[article]  inPAINTINDIA > Vol. LXXI, N° 2 (02/2021) . - p. 74-78 Titre : Low viscosity hardeners gives superior aesthetics even at high application temperatures Type de document : texte imprimé Auteurs : Sachin Kamble, Auteur ; Shweta Gupta, Auteur Année de publication : 2021 Article en page(s) : p. 74-78 Langues : Anglais (eng) Catégories : Haut extrait sec Oligomères Polyisocyanates Réticulants Revêtements -- Additifs:Peinture -- Additifs Temps de séchage Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Coatings on large surfaces like bus, railway coaches often encounter several challenges such as narrow application window, longer recoat interval, overspray merging problem, drying behavior etc. which results into poor finish, gloss and DOI (Distinctness of Image). This phenomenon becomes more adverse in tropical countries like India where temperature and humidity are on extreme side especially during the time of application. Covestro has the most innovative low viscous high solid Polyisocyanate technology to address this issue. These products not only meet the performance requirements but also achieve superior appearance. Note de contenu : - Evolution of high solid low viscous crosslinkers - HDI isocyanurate formation : Key challenges while coating large surface areas when applying in hot conditions - Advantages of high solid low viscous polyisocyanate are given velow - 1) Better appearance, 2) Pot life, 3) VOC emissions reduction - Low viscous trimer for waterborne applications - Table 1 : Influence of oligomer distribution on viscosity & drying time - Table 2 : Covestro product portfolio for high solid low viscous En ligne : https://drive.google.com/file/d/1PvCDGut2wicH91rKOM1HIgZ-HEkPIUbR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35238 [article]

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Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating / Dijun Huang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 1109-1116 Titre : Preparation and characterization of a novel ultraviolet/thermal dual-curing thiol-ene/polyurethane acrylate coating Type de document : texte imprimé Auteurs : Dijun Huang, Auteur ; Yongxia Ren, Auteur ; Ruoning Yang, Auteur ; Zhiguo He, Auteur ; Youwei Yao, Auteur Année de publication : 2021 Article en page(s) : p. 1109-1116 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymère uréthane acrylate Dureté (matériaux) Formulation (Génie chimique) Photoréticulation Réaction thiol-ène Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : A novel ultraviolet (UV)/thermal dual-curing thiol-ene/polyurethane acrylate (PUA) coating of PUA oligomer, tripropylene glycol diacrylate, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, and trimethylolpropane tris (3-mercaptopropionate) was prepared. The coating had a rapid surface drying rate with UV radiation (400 W, 50 W/cm2). For example, the surface of the novel thiol-ene/PUA coating dried within 3 s. The hardness, gel content, and initial decomposition temperature at 5 wt% weight loss of the UV/thermal dual-cured sample after 10 min of UV irradiation, followed by heating at 150°C for 20 min, were 37 D, 90.3%, and 302.2°C, respectively, which were higher than the 30 D, 87.7% and 284.9°C of the UV curing control after 10 min of UV irradiation. The curing time of the 1-mm-thick coating was 4.5 min in indoor sunlight (2.3 ± 0.3 mW/cm2) with a gel content of 83.8%. This coating could be applied in the rapid prototyping field with UV or sunlight exposure. Thermal treatment after UV curing could increase the crosslinking degree and influence the sample performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of thiol-ene/polyurethane acrylate coatings - Preparation of cured samples - Characterization - RESULTS AND DISCUSSION : FTIR characterization - Surface drying time with UV irradiation and curing time in sunlight - Gel fraction - Hardness - Thermal stability - Dynamic mechanical thermal performance - Table 1 : Detailed formulations of coatings 1/2 - Table 2 : Surface drying time of coatings 1/2 with UV irradiation - Table 3 : Actual curing time of coatings 1/2 in indoor sunlight - Table 4 : Gel content of cured samples of thiol-ene/PUA coating 1 - Table 5 : Hardness of cured samples - Table 6 : Thermal properties of different samples under Ar - Table 7 : DMTA properties and crosslink density of thiol-ene/PUA-cured samples DOI : https://doi.org/10.1007/s11998-021-00464-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00464-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36217 [article]

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Synthesis of waterborne curing agent and its applications in waterborne polyurethane adhesives / Guoyan Ma in SURFACE COATINGS INTERNATIONAL, Vol. 105.5 (09-10/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.5 (09-10/2022) . - p. 360-364 Titre : Synthesis of waterborne curing agent and its applications in waterborne polyurethane adhesives Type de document : texte imprimé Auteurs : Guoyan Ma, Auteur ; Le Wang, Auteur ; Chengjun Wang, Auteur ; Weibo Wang, Auteur ; Xi Li, Auteur ; Lu Li, Auteur ; Xiaorong Wang, Auteur Année de publication : 2022 Article en page(s) : p. 360-364 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs en phase aqueuse Polymères en émulsion Polyuréthanes Résistance au pelage Réticulants -- Synthèse Réticulation (polymérisation) Rhéologie Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : A novel waterborne curing agent (SWCA) is obtained by the reaction of isophorone diisocyanate (IPDI), poly(propylene glycol) (PPG) and pentaerythritol (PE). Different quantities of SWCA were added to a waterborne polyurethane (WPU) to form a SWCA-modified WPU emulsion (SWPU). The structure of SWCA is characterised by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The effect of SWCA content on the initial tack, peel strength, solvent resistance and curing time are illustrated by T-peel strength, solvent resistance and curing time tests. The rheological properties of SWPU were assessed. The absorption peak at 2263 cm-1 in the ATR-FTIR spectra shows that -NCO groups exist in SWCA. While the content of the curing agent increased from 0% to 4%, the initial strength increased from 1.82 N/mm to 3.87 N/mm; the final peel strength increased from 5.02 N/mm to 7.08 N/mm; and the water and ethanol absorption rate decreased from 11.3% to 6.14% and 15.38% to 11.52%, respectively. The curing time of the SWPU adhesives decreased with increasing curing temperature. The rheological test shows the SWPU emulsion exhibits elastic behaviour. Note de contenu : - EXPERIMENTAL : Materials - Preparation of waterborne curing - Addition of SXCA to WPU - Characterisation - RESULTS AND DISCUSSION : ATR-FTIR spectroscopy of the curing agent SWCA and SWPU - Nuclear magnetic resonance spectrum of SWCA - Adhesion properties of WPU with different curing agent content - Effect of SWCA content on the solvent uptake rate of the SWPU films - Curing time of the SWPU adhesive - Rheological behaviour of the SWPU and WPU emulsions - Table 1 : Curing time of SWPU adhesives with different curing agent content adn different temperature En ligne : https://drive.google.com/file/d/1YiG6P8bY-NuiJ7ML0fWPqMtMtiop4JDY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38297 [article]

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