Cross-linked polymers for aqueous finishing. Binders cross-linked polyaziridine. Part 2 : Behaviour of acrylic binders in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 4 (07-08/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 4 (07-08/2008) . - p. 157-161 Titre : Cross-linked polymers for aqueous finishing. Binders cross-linked polyaziridine. Part 2 : Behaviour of acrylic binders Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 157-161 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition Formulation (Génie chimique) Liants en phase aqueuse Polyacryliques Polyéthylèneimine Résistance à l'abrasion Réticulants en phase aqueuse Revêtements organiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Due to the current stringent regulations regarding emissions into the environment, coating recipes commonly used in leather finishing comprise water-based products. However, in order to obtain the physical properties required for most leather goods, the use of reactive cross-linkers is needed. The present study aims to look into the behaviour of acrylic binders cross-linked with polyaziridine: the amount of cross-linker used, the type of polymer employed, the type of tannage and retannage and the evolution of the reaction over time. A comparison of results shows that the type of tannage and retannage, as well as the physical characteristics of the acrylic binder used are influential factors in the behaviour of acrylic binders cross-linked with polyaziridine. Different amounts of polyaziridine are needed with regard to the type of tannage and retannage and to the physical characteristics of the acrylic binder used. Note de contenu : - Table 1 : Monomers most commonly employed to produce acrylic binders - Table 2 : Physical characteristics of the acrylic binders - Table 3 : Coating formulation - Table 4 : Results of colour fastness to dry rubbing - Table 5 : Results of colour fastness to wet rubbing En ligne : https://drive.google.com/file/d/1gufiXdrRy3Nc5oX3nOQqyu49tee1kRdZ/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38964 [article]

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Making water-borne epoxies more user-friendly / Henning Vogt in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2022)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2022) . - p. 26-31 Titre : Making water-borne epoxies more user-friendly : Protective coatings simplified by novel enabling curing agent technology Type de document : texte imprimé Auteurs : Henning Vogt, Auteur ; Ludovic Ducros, Auteur Année de publication : 2022 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Epoxydes Polymères en émulsion Réticulants en phase aqueuse Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Stabilité au stockage Index. décimale : 667.9 Revêtements et enduits Résumé : Water-borne epoxy systems have made great strides in many application fields, offering excellent corrosion protection at low VOC. However, paint formulations are often complicated and there are still some limitations. A novel enabling curing agent technology has been developed to address some of these shortcomings and provide formulators with a simpler, more user-friendly solution. Note de contenu : - Reduced need for special additives and pigments - High corrosion protection without anti-corrosion pigments - No need for flash rust inhibitor - User-friendly paints - Easy handling - Good storage stability and long shelf life - Cost-saving potential - Eca simplifies formulation and reduces cost En ligne : https://drive.google.com/file/d/1Oc1mfDU2g2S7JnlUlfIiKkwsuFtRPflD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38232 [article]

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Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings / Hong Xu in COATINGS TECH, Vol. 17, N° 5 (05/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 18-27 Titre : Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Joe Mauck, Auteur ; Fernanda Tavares, Auteur ; Anbu Natesh, Auteur ; Jing Li, Auteur Année de publication : 2020 Article en page(s) : p. 18-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Essais de brouillard salin Formulation (Génie chimique) Noix de cajou et constituants Primaire (revêtement) Réticulants Réticulants en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of zero-volatile organic compound (VOC) waterborne epoxy curing agents based on cardanol, a non-food chain and renewable biomaterial, has been developed to meet stricter regulation, as well as high-performance requirements. This article presents the latest performance studies of applying those new Cashew Nutshell Liquid-based waterborne curing agents in typical formulations for heavy duty, industrial, and transportation coatings applications. Test results revealed that the novel waterborne curing agents enable the formulations of low-VOC (< 75 g/L) direct-to-metal primer systems with excellent performance, such as balanced fast cure and long pot life, superior adhesion, and long-term corrosion protection of numerous metal substrates. Furthermore, the influence of various solid epoxy dispersions, different cure processes, and co-solvents upon film formation, adhesion, and anti-corrosion performance are reviewed, and the challenges of improving long-term corrosion protection of waterborne primer systems over galvanized steel substrates are discussed. Note de contenu : - Part 1 : Improved application properties from new waterborne curing agents - Part 2 : Waterborne primer/mid-coat systems based on new WB-A and WB-B curing agents - Part 3 : Wet-on-wet properties - Part 4 : Formulation study - Fig. 1 : Cashew apple and nutshell - Fig. 2 : Average cardanol structure - Fig. 3 : Viscosity changes of waterborne curing agents as function of the percentage of added water - Fig. 4 : Diluation properties of WB-A with various solid epoxy dispersions - Fig. 5 : Linear dry time data ov various waterborne systems - Fig. 6 : Persoz hardness development of various waterborne systems - Fig. 7 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h of salt-spray exposure, respectively (SA 2.5 steel substrate, bake cure, DFT = 60-75 µm) - Fig. 8 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h and 1162 of salt-spray exposure, respectively (S-36 CRS substrate, bake cure, DFT = 75 µm) - Fig. 9 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 2018 h, 1852, and 2018 h of salt-spray exposure, respectively (AA 2024 T3 substrate, bake cure, DFT = 65 µm) - Fig. 10 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 996 h, 949 h of salt-spray exposure, respectively (stainless steel substrate, RT cure, DFT = 65 µm) - Fig. 11 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1115 h, 949 h of salt-spray exposure, respectively (galvanized steel substrate, RT cure, DFT = 65 µm) - Fig. 13 : Photo images of the wet-on-wet application panels after 881 h of salt-spray exposure - Fig. 14 : Panel images of MC#4 system, MC#5 system and MC#5 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 15 : Panel images of MC#4 system, MC#5 system and MC#7 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 16 : Panel images of five waterborne primer systems containing different co-solvents after a 20-h RT aging - Table 1 : Waterborne curing agents - Typical properties - Table 2 : Typical properties of solid epoxy dispersion resins - Table 3 : Waterborne primer formulations based on WB-A, WB-B, and COM - Table 4 : Dry and wet adhesion of WB-1, WB-B, and COM system over various metal substrates - Table 5 : Waterborne primer formulations based on WB-A - Table 6 : Gloss retention of the test panels after wet-on-wet application - Table 7 : Property tests using different solvents En ligne : https://drive.google.com/file/d/1XacND7z3Wh6j3ngkyWrPxrafLk0n_1E-/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34303 [article]

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Polymeric aziridines as benign crosslinkers for water-based coating applications 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. 1345-1355 Titre : Polymeric aziridines as benign crosslinkers for water-based coating applications Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 1345-1355 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formulation (Génie chimique) Laque et laquage Morphologie (matériaux) Polyacryliques Polyéthylèneimine Réticulants en phase aqueuse Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polymeric aziridines are introduced as a new class of low toxicity two-component crosslinkers for carboxylic resins. Using a combination of industry-standard tests and modern biotechnological approaches, the non-genotoxic nature of these compounds was demonstrated. Mechanical analysis of acrylic films formulated with these polymeric aziridines demonstrated that the high crosslink densities typical for classical aziridine chemistry could be attained. Furthermore, distribution of crosslinker molecules in both wet formulation and dried coating could be controlled by adjusting the stabilizing group of the polymeric aziridine. By tuning this stabilization mechanism, we demonstrated customized functional performance for different coating applications. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Formulation - DMTA - TTS - Particle size analysis by DLS - Coating preparation for AFM - AFM measurements - Formulation for application testing - RESULTS AND DISCUSSION : Non-mutagenic aziridines - Analysis of network formation - Crosslinker distribution - Application testing - Table 1 : Induction of biomarkers attributed to DNA damage - Table 2 : Application testing results of aziridines in furniture coating formulation - Table 3 : Application testing results of polymeric aziridines in wood lacquer DOI : https://doi.org/10.1007/s11998-022-00626-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00626-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38274 [article]

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Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane / Xiaolong Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 887-895 Titre : Preparation and characterization of self-crosslinking acrylate emulsion modified by divinyl silane Type de document : texte imprimé Auteurs : Xiaolong Chen, Auteur ; Shusen Cao, Auteur ; Wangting Zhao, Auteur ; Lijun Chen, Auteur Année de publication : 2022 Article en page(s) : p. 887-895 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate d'hydroxyéthyle Auto-réticulation Caractérisation Emulsifiants Granulométrie Latex Polyacrylates Réticulants en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : The divinyl silane modified self-crosslinking polyacrylate latex was successfully prepared by semicontinuous seeded emulsion polymerization. Methyl methacrylate (MMA) and butyl acrylate (BA) were used as main monomers and the reaction was initiated by potassium persulfate (KPS). The modified monomer 1, 3-divinyltetramethyldisiloxane (DVMS) and crosslinked monomer hydroxyethyl acrylate (HEA) were introduced into the basic dispersion. Sodium dodecyl sulfonate (SDS) anionic surfactant and alkyl polyglycoside (APG) nonionic emulsifier were utilized as composite emulsifiers. The structure of latex film was characterized by Fourier transform infrared spectroscopy (FTIR). The latex films were tested by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and contact angle (CA) and apparent crosslinking percentage. The particle size of the emulsion was measured by Zetatrac dynamic light scattering instrument. The optimum conditions are as follows: the amount of composite emulsifier is 5.0%, the mass ratio of SDS to APG is 1:1, the amount of initiator is 0.5%, the amount of DVMS is 5.0%, and the amount of HEA is 1.0%. The emulsion has good mechanical stability and chemical stability, and the storage stability is ideal. The dispersion is blue and translucent, with a small particle size. The apparent crosslinking percentage of the latex film is above 89%, and the highest contact angle was more than 98°. The polyacrylate colloidal film prepared in this paper has outstanding thermal stability and hydrophobicity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of self-crosslinking acrylic latex and its film - Characterizations - RESULTS AND DISCUSSION : FTIR and DSC film analysis of the films - Influence of amount of initiator on conversion percentage and coagulation percentage - The effect of functional monomers on the apparent crosslinking percentage - Water absorption and contact angle of film - Thermal properties of the prepared latex films - Table 1 : Recipe of self-crosslinking acrylic latex - Table 2 : Influence of mass ratio of emulsifier on properties of latex - Table 3 : Particle size of latex DOI : https://doi.org/10.1007/s11998-021-00566-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00566-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38083 [article]

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