Preparation and performances of cationic waterborne polyurethane coating co-modified with acrylic and amino acid / Guankun Kuang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 3 (05/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 3 (05/2024) . - p. 879-892 Titre : Preparation and performances of cationic waterborne polyurethane coating co-modified with acrylic and amino acid Type de document : texte imprimé Auteurs : Guankun Kuang, Auteur ; Yan Liu, Auteur ; Ying Qin, Auteur ; Tianhao Lu, Auteur ; Binjie Xin, Auteur Année de publication : 2024 Article en page(s) : p. 879-892 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides aminés Les acides aminés (ou aminoacides) sont une classe de composés chimiques possédant deux groupes fonctionnels : à la fois un groupe carboxyle –COOH et un groupe amine –NH2. Parmi ceux-ci, les acides α-aminés se définissent par le fait que leur groupe amine est lié à l'atome de carbone adjacent au groupe acide carboxylique (le carbone α), ce qui leur confère la structure générique H2N–CHR–COOH, où R représente la chaîne latérale, qui identifie l'acide α-aminé. Les acides α-aminés jouent un rôle fondamental en biochimie comme constituants élémentaires des protéines : ils polymérisent en formant des liaisons peptidiques qui aboutissent à de longues chaînes macromoléculaires appelées peptides. Polyacryliques Polymères cationiques Polymères en émulsion Polyuréthanes Revêtements -- Propriétés mécaniques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic acid is commonly used to modify anionic waterborne polyurethanes, and little research has been done on the modification of cationic waterborne polyurethanes. In this study, the effect of acrylic acid addition at different levels on the performance of cationic waterborne polyurethanes was investigated. The experimental results showed that the stability, and chemical resistance of cationic waterborne polyurethane coatings were improved with the addition of acrylic acid, which has the advantages of better chemical resistance, high stability and low price, and the hardness of the coating gradually increased and the adhesion decreased with the increase of acrylic acid content, therefore, the acrylic acid content of 21% was the most suitable. In addition, the effect of amino acids as neutralizing agents on the performance of cationic waterborne polyurethane coatings was also explored. The addition of amino acids helped the cationic waterborne polyurethane to form a reticular crosslinked structure, and the experimental results showed that the mechanical properties of the cationic waterborne polyurethane coatings were greatly improved. Compared with the commonly used acids (hydrochloric acid and acetic acid), amino acids have the advantage of being environmentally friendly and non-toxic, which is more conducive to the industrial production and application of cationic waterborne polyurethane coatings. Note de contenu : - PREPARATION : Materials - Synthesis of CWPUA emulsion - Preparation of membrane - Preparation of tinplate coating - Characterization of the dispersibility of CWPUA emulsions - Structural and morphological characterization of CWPUA coatings - Characterization of water resistance properties of CWPUA coatings - Thermal stability characterization of CWPUA coatings - Characterization of mechanical properties of CWPUA coatings - Characterization of chemical resistance of CWPUA coatings - Other performance tests of CWPUA coatings - RESULTS AND DISCUSSION : Dispersibility of CWPUA emulsions - FTIR spectra of CWPUA film - Water resistance of CWPUA coatings - Thermal properties of CWPUA coatings - Mechanical performance of CWPUA coatings - Microscopic morphology of CWPUA coatings - Performance of CWPUA coatings - Chemical resistance of CWPUA coatings DOI : https://doi.org/10.1007/s11998-023-00857-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00857-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41064 [article]

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