Characterization, coating and biological evaluation of polyol esters rosin derivatives as coating films / A. A. Soliman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 373-381 Titre : Characterization, coating and biological evaluation of polyol esters rosin derivatives as coating films Type de document : texte imprimé Auteurs : A. A. Soliman, Auteur ; M. M. Elsawy, Auteur ; N. A. Alian, Auteur ; N. O. Shaker, Auteur Année de publication : 2021 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Caractérisation Colophane La colophane est le résidu solide obtenu après distillation de la térébenthine, oléorésine (appelée aussi gemme), substance récoltée à partir des arbres résineux et en particulier les pins (le genre Pinus) par une opération que l'on appelle le gemmage. La colophane est solide et cassante à température ambiante. Sa couleur va du jaune très clair au quasi noir en fonction essentiellement de la conduite de la distillation, la couleur ou grade est défini par une échelle de lettre allant de D pour le plus foncé à X pour le plus clair. La colophane ne fond pas mais se ramollit avec la chaleur, son point de ramollissement se situant autour de 70 °C. Cette résine a les propriétés de coller et d'imperméabiliser. Elle fait partie des liants utilisés dans les antifoulings. La colophane est composée à 90% d’un mélange d’acides organiques de la famille des diterpènes appelés acides résiniques, qui répondent à la formule brute C20H30O2. Ces acides résiniques sont des isomères. La proportion des différents acides résiniques dans la colophane est variable suivant l’espèce de pin à partir de laquelle la colophane a été obtenue. Certains acides ne sont présents que chez certaines espèces (et leur sont donc caractéristiques). La colophane (ou « rosine ») a de nombreux usages. On la trouve notamment dans les peintures antifouling où elle se substitue au tributylétain interdit. C'est un irritant et un allergisant pour la peau et les voies respiratoires, sous forme pure ou par ses produits de dégradation. Enrobage (technologie) Esters Polyols Revêtements -- Analyse Revêtements -- Propriétés chimiques Revêtements -- Propriétés mécaniques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polyol esters materials, which have been developed from ethylene glycol, glycerol, pentaerythritol and sorbitol with rosin, were investigated for their formed films and coating properties. Films were dried and characterized for chemical and mechanical resistances. Their films were highly resistant to water, solvents (acetone, toluene and methanol), and acids (10% hydrochloric acid and 20% sulfuric acid) and poorly resistant to alkali (10% sodium hydroxide) as well as adhesion, tensile strength, elongation test, modulus of elasticity, pinhole test and scratching and flexibility tests. Incorporation of ethylene glycol, glycerol, pentaerythritol and sorbitol with rosin was done to achieve good mechanical characteristics and high chemical resistance to these films. The prepared compounds were tested for antibacterial activity against Trametes versicolor and Gloeophyllum trabeum. Note de contenu : - MATERIALS AND METHODS - CHARACTERIZATION OF BIOMATERIALS : Free film preparation and characterization - Bioactivity of rosin derivatives - RESULTS AND DISCUSSION : Synthesis of polyol esters of maleic rosin (EGMR, GMR, PMR, SMR) - Physicochemical properties - Evaluation of film properties - - Table 1 : Characterization of biomaterials derivatives - Table 2 : Drying time characteristic data of biomaterials - Table 3 : Water resistance data of biomaterials - Table 4 : Acid resistance of 10% HCl of biomaterials - Table 5 : Acid resistance of 20% H2SO4 of biomaterials - Table 6 : Alkali resistance of 10% NaOH of biomaterials - Table 7 : Acetone resistance of biomaterials - Table 8 : Toluene resistance of biomaterials - Table 9 : Methanol resistance of biomaterials - Table 10 : Mechanical characteristics of stoved films of biomaterials - Table 11 : Average diameter of inhibition zone of control of biomaterials against Trametes versicolor and Gloeophyllum trabeum in 0.025 mm DOI : https://doi.org/10.1007/s11998-020-00408-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00408-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35601 [article]

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Preparation of polyurethane coating formulation based on dihydropyridine derivatives as an insecticide and antifungal additives for surface coating applications / Mohamed A. Awad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 521-533 Titre : Preparation of polyurethane coating formulation based on dihydropyridine derivatives as an insecticide and antifungal additives for surface coating applications Type de document : texte imprimé Auteurs : Mohamed A. Awad, Auteur ; N. M. Saleh, Auteur ; M. M. Elsawy, Auteur ; Salem S. Salem, Auteur ; H. Abd El-Wahab, Auteur Année de publication : 2023 Article en page(s) : p. 521-533 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Caractérisation Dihydropyridine Formulation (Génie chimique) Insecticides Polyuréthanes Revêtement de surface Revêtements -- Propriétés mécaniques Revêtements -- Propriétés physiques Vernis -- Additifs Vernis bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : Pyridine derivatives are prepared and evaluated before being incorporated into polyurethane coating formulations to create antifungal and insecticidal coating compositions. Different analyses, including Fourier transform infrared (FTIR), mass, proton nuclear magnetic resonance (1HNMR), and carbon-13 nuclear magnetic resonance (13C NMR) spectra, were used to confirm the synthesized compounds. The material has been coated using a polyurethane coating mixture. Gloss, scratch resistance, flexibility, and adhesion are some of the coating attributes investigated; mechanical capabilities include impact resistance and shore hardness, and physicochemical properties such as chemical resistance of coated polyurethane (PU) samples are also investigated. PU coatings were applied to substrates to measure coating properties. The mechanical properties of the PU cast films were measured. The results of the experiments revealed that all PU coatings based on dihydropyridine derivatives had good scratch resistance which varied from > 1.5 to > 2 kg. While reducing gloss value varied from 65 to 85, there is no effect of the prepared compounds in the other mechanical test. These PU coatings have excellent chemical resistance except the alkali resistance as evidenced by their physicochemical properties. The observed antifungal and insecticide activities indicated that dry wood coated with PU based on dihydropyridine derivatives is promising for resistance to these insects and fungi, in comparison with the paint as blank. The results revealed that the inhibition zones diameter by compound 2 were 25.1 ± 0.69, 23.2 ± 0.94, 20.16 ± 0.62, 20 ± 0.80, and 18 ± 0.81 mm against A. terreus, A. niger, A. flavus, C. albicans, and A. fumigatus, respectively, whereas the inhibition zones (IZ) diameter by compound 3 were 22.56 ± 0.30, 21.03 ± 0.49, 21.03 ± 0.61, 21 ± 0.66, and 20 ± 0.78 mm versus A. niger, A. fumigatus A. flavus, C. albicans, and A. terreus, respectively. The ordering activity against insects increased as the dose concentration of the pyridine derivatives was increased. Note de contenu : - MATERIALS AND METHODS : Materials - Methods and technique - 6-Diamino-4-(2-bromophenyl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (2) - 6-Amino-1-((2-bromobenzylidene)amino)-4-(4-hydroxy-3-methoxyphenyl)-2-oxo-1,2-dihydropyridine-3,5-dicarbonitrile (3) - Characterization of the prepared organic compound by spectral analysis - Application of the Insecticide-based PU (polyurethane) varnish and Control PU (polyurethane) varnish - Characterization techniques - Antifungal activity of pyridine derivatives (2 and 3) - Characterization of insects - Bioassay with paint - STATISTICAL ANALYSIS OF DATA - RESULTS AND DISCUSSION : Characterization of the prepared polyurethane varnish embedded with pyridine derivatives as antifungal and insecticide agents - Physical and mechanical characteristics of the coated films by PU (polyurethane) varnish embedded with the prepared additives - Antifungal activity - Adulticidal assay of the prepared pyridine derivatives - Table 1 : Formulation of two pack high gloss polyurethane varnish incorporated with dihydropyridine derivatives - Table 2 : Physical and mechanical characteristics of the coated films by PU varnish embedded with the prepared additives - Table 3 : Chemical resistance of pure PU varnish and PU incorporated with dihydropyridine derivatives - Table 4 : Insecticide activity of 2 and 3 against adult house fly Musca domestica and calculated LC50(LC90) after 72 h of mortalityTable 5 Insecticide activity of 2 and 3 incorporated with PU varnish against adult of house fly Musca domestica and calculate LC50(LC90) after 72 h of mortality DOI : https://doi.org/10.1007/s11998-022-00684-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00684-0.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39295 [article]

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