Aliphatic epoxy emulsion crosslinker for waterborne coatings / Delano R. Eslinger in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 850 (11/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 850 (11/1995) . - p.45-50 Titre : Aliphatic epoxy emulsion crosslinker for waterborne coatings Type de document : texte imprimé Auteurs : Delano R. Eslinger, Auteur Année de publication : 1995 Article en page(s) : p.45-50 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Formulation (Génie chimique) Groupement carboxyle Polyacryliques Réticulants Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Many waterborne polymers and dispersions have carboxyl functionality in their structure. These carboxyl groups are multifaceted in their utility. They are often necessary to introduce water solubility or water dispersibility characteristics to waterborne resins, impart stability to waterborne vahicles, and often offer advantages in dried film properties, especially with respect to substrate adhesion. However, due to the hydrophilic nature of these carboxyl groups, fims from waterborne coatings often exhibit high water vapor permeability and poor wet adhesion properties. Note de contenu : - Epoxy crosslinkers - Nature of the carboxylic group - Acrylic emulsions and dispersions - Epoxy index - Evaluation of commercially available acrylic emulsions - Effect of catalyst - Pot life considerations - Formaldehyde free baking enamels Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18577 [article]

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Application of carboxyl-functionalized epoxy resin in the leather tanning process / Bin Lyu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 7 (07/2018) . - p. 225-231 Titre : Application of carboxyl-functionalized epoxy resin in the leather tanning process Type de document : texte imprimé Auteurs : Bin Lyu, Auteur ; Li Yajuan, Auteur ; Dangge Gao, Auteur ; Jianzhong Ma, Auteur ; Lv Leihong, Auteur Année de publication : 2018 Article en page(s) : p. 225-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Détérioration enzymatique Douceur (toucher) Eaux usées -- Teneur en chrome hexavalent Epoxydes Groupement carboxyle Polymères -- Synthèse Réactions chimiques Stabilité hydrothermale Tannage Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is widely used in the tanning process ; however, it can cause environmental pollution. Leather tanned with epoxy resin was considered as a more environmentally friendlyprocess, but it takes as long as five days for reaction, and results in poor performance of leather. The aim of the present study was to tan leather collagen with a carboxyl-functionalized epoxy resin, which was thought to be an eco-friendly tanning process and the reaction time was shortened to 12h. The reaction between carboxyl-functionalized epoxy resin and leather collagen can be divided into two stages, the reaction of epoxy group with leather collagen and the reaction of carboxyl group with leather collagen. The influences of tanning conditions (medium pH, epoxy resin amount and reaction time) on the properties of tanned leather were also discussed. In the first stage, the epoxy group was reacted with leather collagen in basic conditions. The results showed that the carboxyl-functionalized epoxy resin could better penetrate into the leather fibers when the pH value was 8.5, and the best effect of tanned leather collagen was found using reaction condition of pH 7.0. In the second stage, it was the reaction of carboxyl group to leather collagen in acid conditions, and the best effect was found under the condition of pH was 3.5. Meanwhile, it provided a better tanning effect when the carboxyl-functionalized epoxy resin amount was 6% and the reaction time was 12h. The chrome-less tanning process that carboxyl-functionalized epoxy resin combination with 3% chrome was studied. The results showed that the hydrothermal stability and strength properties of leather tanned by carboxyl-functionalized epoxy resin with 3% chrome were close, even superior, to those of the leather produced by conventional chrome tanning with 8% chrome. Note de contenu : - MATERIALS AND METHODS : - Material - Methods : Synthesis of the carboxyl-functionalized epoxy resin - Tanning methodology - Testing and characterization : Shrinkage temperature - Thickness increment ratio - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water - Calculation - RESULTS : - Tanning conditions of carboxyl-functionalized epoxy resin pH : The amount of tanning agent - Chrome-less tanning results : SEM topography of the leather - Physical properties - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water En ligne : https://drive.google.com/file/d/1zAn7Cgd6nhD2xonUrhpGkK5uE09EybTG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30830 [article]

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Balancing adhesion and cohesion in WB packaging adhesives / Bradley A. Jacobs in ADHESIVES AGE, Vol. 39, N° 12 (11/1996)  

[article]  inADHESIVES AGE > Vol. 39, N° 12 (11/1996) . - p. 40-44 Titre : Balancing adhesion and cohesion in WB packaging adhesives Type de document : texte imprimé Auteurs : Bradley A. Jacobs, Auteur Année de publication : 1996 Article en page(s) : p. 40-44 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs en phase aqueuse Adhésion Copolymère acrylique acétate de vinyle Groupement carboxyle Pelage Polyacétate de vinyle Résistance à l'arrachement Résistance au cisaillement Résistance au fluage Réticulation (polymérisation) Thermogravimétrie Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Challenges posed by low energy substrates, environmental regulations, product integrity and economic pressure place demands on adhesive performance that are increasingly difficult to meet using traditional technologies. PVOH-stabilized vinyl acetate/acrylics present a new approach to satisfying these demands. While VAAs have found initial acceptance in applications requiring Tgs below the range accessible with VAE technology, this work has demonstrated that VAAs offer advantages even at higher Tgs. Rovace HP-3442 exhibits an attractive combination of adhesion to a wide range of difficult-to-bond substrates, cohesive strength comparable to VAEs and good creep resistance. The scope of this study has been the performance of the copolymer backbones, but other advantages of using VAAs become apparent when compounding begins. PVOH stabilization gives the VAAs excellent mechanical stability and compatibility with common formulating raw materials. The incorporation of carboxyl functionality provides reactive groups for crosslinking chemistry. And the vinyl acrylic copolymers are compatible with a range of tackifiers and other additives that provide added versatility and flexibility for formulating to meet specific performance requirements (3). Couple these benefits with the economics of vinyl acetate copolymers and one can see low VAAS are the-state-of-the-art in waterborne adhesive emulsions. Note de contenu : - ADHESION VS.COHESION - EXPERIMENTAL : Quantitative adhesive strength - Quantitative cohesive strength - 180° peel adhesion - Hot shear strength - Thermogravimetric analysis (TGA) - RESULTS AND DISCUSSION : Peel adhesion - Shear adhesion En ligne : https://drive.google.com/file/d/1SJqmHAC8Nj95GNliW1XCmKH_fQtbEo33/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20547 [article]

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Crosslinking of waterborne polyurethane dispersions / Valentino J. Tramontano in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 848 (09/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 848 (09/1995) . - p. 89-99 Titre : Crosslinking of waterborne polyurethane dispersions Type de document : texte imprimé Auteurs : Valentino J. Tramontano, Auteur ; Werner J. Blank, Auteur Année de publication : 1995 Article en page(s) : p. 89-99 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents d'expansion (chimie) Contraintes (mécanique) Déformations (mécanique) Dispersions et suspensions Groupement carboxyle Hydroxyle En chimie organique, un hydroxyle (ou oxhydryle) peut désigner deux entités. Un groupement -OH, appelé aussi hydroxy, qui se rencontre en particulier dans les alcools et les phénols. Un radical : HO^{\bullet}. Il est produit par exemple lors de réactions de dissociation de peroxydes, en présence d'ions de métaux de transition (Fe(II), Cu(I), réaction de Fenton), de chauffage ou de rayonnement. Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polymères en émulsion Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse:Peinture en phase aqueuse Revêtements sans isocyanates Index. décimale : 667.9 Revêtements et enduits Résumé : A hydroxyl/carboxyl functional low molecular weight polyurethane dispersion was prepared by a nonisocyanate process. It was compared to a conventional high molecular weight polyurethane dispersion in films cured with melamine-formaldehyde resins. Stress-strain studies and solvent swelling experiments were used to characterize network formation and determine crosslink density. The morphology of the films prepared from the two types of polyurethanes were different, and coatings performance advantages were found with the low molecular weight polyurethane dispersion. Surface analysis by FTIR ATR indicates a more uniform distribution of melamine crosslinker in the cured low molecular weight polyurethane coating. Note de contenu : - EXPERIMENTAL: Materials - Coating formulations - Stress-strain measurements - Swelling experiments - FIT ATR surface analysis - Stain testing of coatings - RESULTS AND DISCUSSION: Coating test results - Swelling experiments - Stress strain analysis of the free films - FTIR ATR analysis of free films - Stain test results of coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18553 [article]

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Effect of acid groups in hydroxyl functional resins on the properties of polyester-urethane powder coating / Bin Wu in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 906 (07/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 906 (07/2000) . - p. 55-62 Titre : Effect of acid groups in hydroxyl functional resins on the properties of polyester-urethane powder coating Type de document : texte imprimé Auteurs : Bin Wu, Auteur ; Sanjay Padaki, Auteur Année de publication : 2000 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acidité Couches minces Essais de brouillard salin Formulation (Génie chimique) Groupement carboxyle Hydroxyle En chimie organique, un hydroxyle (ou oxhydryle) peut désigner deux entités. Un groupement -OH, appelé aussi hydroxy, qui se rencontre en particulier dans les alcools et les phénols. Un radical : HO^{\bullet}. Il est produit par exemple lors de réactions de dissociation de peroxydes, en présence d'ions de métaux de transition (Fe(II), Cu(I), réaction de Fenton), de chauffage ou de rayonnement. Liants Polyesters Polyuréthanes Résistance aux conditions climatiques Réticulation (polymérisation) Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl-terminated polyester resins with different acid numbers were synthesized and used in powder coating formulations. Coatings were formulated with isophorone diisocyanate (IPDI)-based hardeners and tested for mechanical performance, appearance, and weathering. This study found that resins containing a high concentration of residual acid groups (also referred to as undercondensed resins) had to be formulated according to their total reactive number, the sum of acid and hydroxyl numbers, in order to achieve complete cure. High acid numbers also caused poor overbake and salt spray resistance. The addition of adipic or benzoic acids to the powder formulation accelerated cure. Note de contenu : - RESULTS AND DISCUSSION: Resins - Powder formulation - Curing chemistry - Effect of AN and crosslinker stoichiometry on curing - Acid catalysis - Effect of residual acid groups on coating properties - Overbake resistance - Salt fog testing (ASTM B 117) - Curing residual carboxyl groups Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17986 [article]

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Effect of carboxyl group content of collagen on chromium absorption / Xia Chunchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 3 (05-06/2011)  

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Effects of glycidyl methacrylate content and addition sequence on the acrylic latexes with carboxyl groups / Guofeng Qin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)  

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A further investigation on collagen-Cr(III) interaction at molecular level / Weimo Han in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 3 (03/2016)  

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A little goes a long way / Detlef Burgard in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2014)  

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Missing link / Kenta Kanaida in ADHESIVES AGE, Vol. 44, N° 8 (08/2001)  

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N, n-bis (2-hydroxyethyl) fatty amide as novel environmentally friendly crosslinking agent for acid functional acrylic copolymer resin / D. A. Raval in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 883 (08/1998)

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A novel pre-tanning agent for high exhaustion chromium tannage / Luan Shifang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)  

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Oxidizing degradation of Valonia extract and utilization of the products - Part 3 : Auxiliary tanning effects of degraded producs using 20% and 30% H202 / Ying Di in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 5 (09-10/2001)  

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Preparation and characterization of waterborne polyurethane/polyacrylate emulsions containing sulfonate groups / Xiaorong Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

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Rheological characterization and thermal stability of different intrinsic viscosity poly(ethylene terephthalate) in air and nitrogen / S.-C. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 3 (07/2016)  

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Synthesis of a novel hyperbranched polyester with carboxyl end groups applied to UV-curable waterborne coating / Jieming Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

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The further investigation of tanning mechanisms of typical tannages by ultraviolet-visible and near infrared diffused reflectance spectrophotometry / Junling Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)  

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The relationship between the structure of hyper-branched polymer and its effect on high exhaust chrome in reduced chrome tanning / Yao Qi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)  

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