Effect of pigment-acrylic binder ratio on the surface and physical properties of resin finished leather / Suriya Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 1 (01/2024) . - p. 20-30 Titre : Effect of pigment-acrylic binder ratio on the surface and physical properties of resin finished leather Type de document : texte imprimé Auteurs : Suriya Madhan, Auteur ; Mishamo Wakaso, Auteur ; Sathya Ramalingam, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 20-30 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Formulation (Génie chimique) Liants Polyacryliques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The current study attempts to investigate the surface phenomenon and physical characteristics of leather finished with brown pigment and different types of acrylic binders. Using the contact angle measurements of three different liquids on the above finished leathers and films, the surface energy and work of adhesion were evaluated. The pigment to acrylic binder ratio (PABR) for best adhesion of finish film on the leather surface was optimized using the contact angle goniometer. Different types of acrylic binder films were coated and their surface behaviour was studied. The crust leather was coated with different types of pigment-acrylic binder (Very Soft, Soft and Medium Soft) finish formulations. The contact angle of both the acrylic films and the PABR finished leathers were measured against Water, Dimethyl sulfoxide (DMSO) and Hexadecane (HD). According to the study’s results, the surface properties of finished leather were directly related to the degree of wetting. The PABR was found to be effective at 1:3 for very soft binder, 1:2.5 for soft, 1:2 for medium soft binders due to higher contact angle and lower surface energy values (γsv). At 1:3 and 1:2.5, the contact angle of very soft and soft binder leather was 82.62° and 83.45° and for medium soft binder it was 82.67° at 1:2 ratio. The surface energy values of optimized PABR of very soft binder (1:3) was 28.29 (mN/M), soft binder (1:2.5) was 27.50 (mN/m) and medium soft binder (1:2) was 29.27 (mN/m). The optimized PABR work of adhesion values of very soft binder, soft binder and medium soft binder was 82.15 (mJm-2), 81.11 (mJm-2), 82.09 (mJm-2). In order to correlate the observed surface properties with leather finish properties, finished leathers were tested for finish adhesion, vamp flexing value, water vapour permeability, wet and dry rub fastness. According to the water vapour permeability, soft and medium binder showed good permeation due to the uncovering of nanopores. But the adhesion, grain crack resistance and grain smoothness were higher in the case of the soft binder. Overall leather properties divulges that the pigment to binder ratio and the type of binder plays an important role in surface properties of the finished leather. This study enables us to determine the optimal PABR for effective finish properties to meet the required leather standards for various usage, as well as better utilisation of finishing chemicals. Note de contenu : - MATERIALS AND METHOD : Materials - method : Finish formulation preparation - Finished upper leather preparation - Acrylic binder film preparation - Determination of contact angle - Measurement of work of adhesion - Measurement of adhesion of finish - Determination of flexing endurance - Determination of wet and dry rub fastness - Determination of water-vapor permeability - Determination of physical strength characteristics - Determination of organoleptic properties - RESULTS AND DISCUSSION : Contact angle and surface energy and work of adhesion parameters of different acrylic binder films - Correlation between surface energy and work of adhesion parameters for various PABR of very soft binder - Correlation between surface energy and work of adhesion parameters for various PABR of soft binder - Correlation between surface energy and work of adhesion parameters for various PABR of medium soft binder - Water vapor permeability - Finish adhesion properties of finished leather - Organoleptic properties analysis - Table 1 : Characteristics of the binder chosen for finishing application - Table 2 : Finish formulations prepared at a varied concentration of different acrylic binder - Table 3 : Contact angle and surface energy and work of adhesion value for binder coated on a microscopic slide - Table 4 : Contact angle and surface energy and work of adhesion values for vaious PABR of very soft binder - Table 5 : Contact angle and surface energy and work of adhesion values for various PABR of soft binder - Table 6 : Contact angle and surface energy and work of adhesion values for various PABR of medium soft binder - Table 7 : Adhesion properties of optimum PABR of various binder - Table 8 : Organoleptic properties of optimum PABR of various binder DOI : https://doi.org/10.34314/jalca.v119i1.8291 En ligne : https://drive.google.com/file/d/1W93p1wv9mAcBRQf17cZQViw7-2kk6Jpb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40346 [article]

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Influence of polyurethane binders on the surface properties of finished leathers : Part 1 - Function as a sealing coat / Suriya Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 7 (07/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 7 (07/2024) . - p. 295-302 Titre : Influence of polyurethane binders on the surface properties of finished leathers : Part 1 - Function as a sealing coat Type de document : texte imprimé Auteurs : Suriya Madhan, Auteur ; R. Monica Denise, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 295-302 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de bovins Energie de surface Essais dynamiques Etanchéité Liants Mesure Perméabilité Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Finishing is the final stage of the leather-making process, where the surface of the leather is enhanced to improve its durability, appearance, and texture. The sealing coat (used predominantly in corrected grain leathers for leather accessories and footwear industries) is the first step that forms the bottom layer of the leather finishing film before the base coat. The goal of the sealing coat is to keep the leather surface reactive and prevent the pigmented base coat from sinking completely into the grain of the leather. The chemicals used in the sealing coat provide the leather surface with a charge and condition (addition of oil/fat and/or polyurethane -PU) to ensure that the chemicals (pigments, binders, and other additives) used in the base coat of the finishing process are not completely absorbed into the grain layer of the crust leather. In the present study, the influence of PU as an additive to the sealing coat formulation was evaluated through measurement of surface properties, such as contact angle, surface energy, and work of adhesion. The values of the contact angle between the liquids (water/dimethyl sulfoxide/hexadecane) and the leather surface were used to evaluate the leather’s surface energy and work of adhesion. The water contact angle of the uncoated crust, cationic oil ground (COG)-coated crust, and COG-PU-coated crust was measured as 77.3, 93.6, and 109.0 degrees respectively. The increase in contact angle indicates an increase in the hydrophobicity of the leather’s surface on coating with COG and COG+PU. The surface energy component (γs) of the crust leather surface without coating, COG-coated, and COG-PU-coated leathers were 35.2, 28.3, and 24.8 m/Nm, while the work of adhesion of the above leathers for water were 88.8, 68.2, and 49.1 mJm-2, respectively. The experimental values indicated that PU plays an important role as an additive to the sealing coat and enhances the required properties in the finishing process for the desired final leather. Note de contenu : - EXPERIMENTAL SECTION : Materials - METHOD : Determination of contact angle - Measurement of work of adhesion and surface energy - Determination of wet and dry fastness - Determination of water-vapor permeability - Determination of physical strength characteristics - Measurement of adhesion of finish - Determination of organoleptic properties - RESULTS AND DISCUSSON : Contact angle and surface parameters of dyed crust, COG-coated and COG-PU-coated leather - Work of adhesion and surface energy of dyed crust, COG-coated leather, and COG-PU-coated leather - Relationship between work of achesion/surface energy and acidity/basicity of leathers coated with COG and COG-PU - Relationship between surface energy and polarity of leathers coated with COG and COG-PU - Water vapor permeability - The influence of COG and COG-PU coat on the physical organoleptic properties of finished leathers - Table 1 : Process of wet blue to black crust from cow hides - Table 2 : Process of sealing coat - Table 3 : Process of PU-sealing coat - Table 4 : Process of base and top coat after sealing/PU sealing coat - Table 5 : Contact angle, surface energy (ysv), acidity, basicity, polarity, work of adhesion (Wa) of dyed crust, COG-coated, and COG-PU-coated leathers - Table 6 : Finish adhesion, fastness to rub, and elongatio at break of dyed crust, COG-coated and COG-PU-coated leather - Table 7 : Organoleptic properties of the dyed crust, COG-coated and COG-PU-coated leather DOI : https://doi.org/10.34314/wdwj1p18 En ligne : https://drive.google.com/file/d/1J-_XLaKaV9az3xQYOPmWX42gVhsR-1lP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41283 [article]

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