Fabrication of a nonionic self-emulsifiable waterborne epoxy curing agent with high cure properties / Xiaofeng Huang 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. 549-558 Titre : Fabrication of a nonionic self-emulsifiable waterborne epoxy curing agent with high cure properties Type de document : texte imprimé Auteurs : Xiaofeng Huang, Auteur ; Lei Wang, Auteur ; Yingbiao Lai, Auteur ; Laizhou Li, Auteur ; Xiang Jiang, Auteur Année de publication : 2021 Article en page(s) : p. 549-558 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composés organiques -- Synthèse Mesure Revêtements -- Propriétés mécaniques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne epoxy curing agent plays a key part in the waterborne epoxy resin coatings, directly affecting the physical and chemical properties of the coating film. Here, we present triethylene tetramine (TETA), polypropylene glycol diglycidyl ether (PPGDGE), epoxy resin E20 and phenyl glycidyl ether (PGE) as reactants to fabricate a novel nonionic self-emulsifiable waterborne epoxy curing agent for oily epoxy resin through three steps of chain extension reaction, addition reaction, and capping reaction. The curing agent achieved excellent emulsifying and curing properties under the condition that TETA reacted with PPGDGE at 65°C for 4 h with the molar ratio of 2.2:1, 40% primary amine was added with E20 at 65°C for 3 h and 125% residual primary amine was capped with PGE at 65°C for 3 h. The as-prepared waterborne epoxy curing agent was characterized by Fourier transform-infrared spectroscopy and surface tension. The cured film of emulsified oily epoxy resin (E51) prepared by the as-prepared curing agent indirectly was characterized by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry tests. The 2K waterborne epoxy coating film prepared by the as-prepared nonionic self-emulsifiable curing agent and E51 displayed better thermal property, surface appearance, flexibility, impact resistance, adhesion, and chemical corrosion resistance. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of self-emulsifiable epoxy curing agent - Emulsifying of oily epoxy resin - Measurement and characterization - RESULTS AND DISCUSSION : Fabrication of self-emulsifiable waterborne epoxy curing agent - Properties of 2K waterborne epoxy coating film - Scheme 1 : The three steps of chemical reaction for synthesis of the self-emulsifiable epoxy curing agent - Table 1 : Influence of the molar ratio of TETA to PPGDGE on emulsifying and curing properties - Table 2 : Influence of the molar ratio of E20 to the adduct on emulsifying and curing properties - Table 3 : Influence of the molar ratio of PGE to the residual –NH2 group on emulsifying and curing properties - Table 4 : Performance parameter of waterborne epoxy curing agent - Table 5 : Comparison of mechanical properties and corrosion resistance between different epoxy resin films DOI : https://doi.org/10.1007/s11998-020-00423-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00423-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35614 [article]

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A single-step pad-steam cationisation and dyeing process for improving dyeing properties of cotton fabrics / Lei Wang in COLORATION TECHNOLOGY, Vol. 138, N° 5 (10/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 5 (10/2022) . - p. 509-521 Titre : A single-step pad-steam cationisation and dyeing process for improving dyeing properties of cotton fabrics Type de document : texte imprimé Auteurs : Lei Wang, Auteur ; Guangyuan Xie, Auteur ; Xiang Mi, Auteur ; Xiaohu Kang, Auteur ; Qiuyu Zhu, Auteur ; Zhicheng Yu, Auteur Année de publication : 2022 Article en page(s) : p. 509-521 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cationisation Colorants réactifs Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Teinture -- Fibres textiles Teinture au tampon Index. décimale : 667.3 Teinture et impression des tissus Résumé : The cationic modification technology for cotton could greatly enhance colour strength and fixation of reactive dyes. However, it is a two-step method when cationic modification is applied to salt-free dyeing. Cotton fabric is initially treated with a cationic compound through exhaust or pad-cure, acid washing and drying process, then the cationic modified cotton is dyed with reactive dye. In this study, a single-step pad-steam cationisation and dyeing process was proposed to shorten the process and improve dye fixation. The fixation reaction between reactive dye and cotton fabrics was conducted at the temperature range 100–140°C and relative humidity range 40–90%. The effects of quaternary ammonium salt and inorganic salt as well as alkaline agent on K/S value and dye fixation were also studied. Furthermore, the drying kinetic of the wet cotton fabric was studied in this article. The result showed that the drying process fitted well to the Page model. The effective moisture diffusivity of wet cotton under different steaming conditions were calculated. An activation energy value of 32.25 kJ/mol was determined. Compared with the conventional process, a single-step pad-steam cationisation and dyeing process not only shortened the process but also increased K/S value and dye fixation. Note de contenu : - MATERIALS AND METHODS : Materials - Pad-dyeing process - Fabric testing - RESULTS AND DISCUSSION : Effect of steaming temperature and time on the single-step pad-steam cationisation and dyeing process - Effect of relative humidity on the single-step pad-steam cationisation and dyeing process - Effect of quaternary ammonium salt and inorganic salt on the single-step pad-steam cationisation and dyeing process - Effect of NaHCO3 concentration on the single-step pad-steam cationisation and dyeing process - Analysis of drying characteristics and effect of the water on the single-step pad-steam cationisation and dyeing process - Comparison of different pad-dyeing processes - Table 1 : Five thin layer drying models used for experimental data - Table 2 : Dry model fitting results - Table 3 : Calculation of effective moisture diffusion coefficient - Table 4 : The K/S value, dye fixation and colourfastness of cotton fabric with different pad-dyeing processes DOI : https://doi.org/10.1111/cote.12608 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12608 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38125 [article]

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