Melamine fiber-synthesis, features and applications / Subhankar Maity in CHEMICAL FIBERS INTERNATIONAL, (10/2013)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (10/2013) . - p. 33-35 Titre : Melamine fiber-synthesis, features and applications Type de document : texte imprimé Auteurs : Subhankar Maity, Auteur ; Kunal Singha, Auteur Année de publication : 2013 Article en page(s) : p. 33-35 Langues : Anglais (eng) Catégories : Analyse thermique Fibres textiles synthétiques Fibres textiles synthétiques -- Analyse Fibres textiles synthétiques -- Applications industrielles Fourier, Spectroscopie infrarouge à transformée de Humidité -- Absorption Mélamine -- Synthèse Production Spécifications Thermogravimétrie Index. décimale : 677.4 Textiles artificiels Résumé : This paper reports the manufacturing, characteristics, applications and scope of melamine fiber. Its unique 3D chemical structure makes it useful for high temperature and high performance applications. Some physical and functional characteristics of this fiber are reported here. A large scope of research and applications has been found regarding melamine fiber. Note de contenu : - MELAMINE CHEMISTRY - SYNTHESIS OF MELAMINE - MELAMINE FIBER PRODUCTION - CHARACTERISTIC FEATURES OF MELAMINE FIBER : Inherent, non-toxic protection - Highly insulating - Attractive finish - Durable and protective - Cool and breathable - THERMOGRAVIMETRIC (TGA) ANALYSIS - DSC ANALYSIS OF MELAMINE - FTIR SPECTRA OF MELAMINE FIBER - MOISTURE SORPTION - TYPICAL APPLICATIONS OF MELAMINE FIBERS - BLENDING WITH OTHER FIBERS - SCOPE OF MELAMINE FIBERS - Table 1 : Specifications of melamine fiber - Table 2 : WRV values of fibers En ligne : https://drive.google.com/file/d/1xaVnxCHBMlzBBEbx8j1bDlFmhAIrH2_0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19762 [article]

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Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 198-206 Titre : Preparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Li Pei-Lin, Auteur ; Jian-Fei Zhou, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 198-206 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Douceur (toucher) Epaisseur -- Mesure Formaldéhyde -- Suppression ou remplacement Fourier, Spectroscopie infrarouge à transformée de Furfural Mélamine -- Synthèse Potentiel zeta Retannage Spectroscopie de la résonance magnétique nucléaire Taille des particules Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins are one of the most important retanning agents used in the leather industry. However, the generally presence of formaldehyde greatly restricts the widespread application of amino resins. In this study, furfural, an organic compound derived from biomass material, was used to substitute for formaldehyde in the synthesis of melamine resin based on an alkaline-acid procedure. The as-synthesized formaldehyde-free melamine resin (MRf) showed excellent performances in leather processing. FTIR and 13C-NMR were used to characterize the chemical structure of MRf. The particle size as well as zeta potential were also determined. The retanning performances of MRf indicated that the overall performances of MRf are comparable to conventional formaldehyde contained melamine resin (MR) and commercial melamine resin (CMR). In particular, the thickness of the leather retanned by MRf was enhanced around 10.33%, which is significantly higher than that of controls MR (6.16%) and CMR (5.94%). Color measurements showed that MRf imparted leather with higher dark intensity. This present work demonstrated that furfural could be a potential candidate to replace formaldehyde in the production of formaldehyde-free melamine resin. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of MRf resin - CHARACTERIZATION OF MRF : Fourier Transform Infrared (FTIR) spectroscopy analysis - Nuclear Magnetic Resonance ( NMR) analysis - Particle size and zeta potential determination - RETANNING PERFORMANCES OF MRF : Physical and mechanical characteristic of leather - Color measurements - Analysis of free formaldehyde content in leather - RESULTS AND DISCUSSION : Preparation of MRf - FTIR spectroscopy analysis of MRf resin - C NMR spectroscopy analysis - Particle size and zeta potential - RETANNING PERFORMANCES OF MRF : Absorption, thickening and softness of leather - Physical and mechanical characteristics of leather - Shrinkage temperature of leather, chromium concentration in spent liquor and formaldehyde content in leather - Color measurements En ligne : https://drive.google.com/file/d/12CWMptyjoA2fiMqA2-t3PL-Scy5xhxRO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30689 [article]

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Sunshine in a bottle : Harnessing the power of persicaria tinctoria extract for radiant skin and enhanced well-being / Morgane de Tollenaere in SOFW JOURNAL, Vol. 150, N° 7-8 (07-08/2024)  

[article]  inSOFW JOURNAL > Vol. 150, N° 7-8 (07-08/2024) . - p. 8-14 Titre : Sunshine in a bottle : Harnessing the power of persicaria tinctoria extract for radiant skin and enhanced well-being Type de document : texte imprimé Auteurs : Morgane de Tollenaere, Auteur ; Anaïs Durduret, Auteur ; Emilie Chapuis, Auteur ; Jessy Martinez, Auteur ; Bénédicte Sennelier-Portet, Auteur ; Amandine Scandolera, Auteur ; Romain Reynaud, Auteur Année de publication : 2024 Article en page(s) : p. 8-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bien-être Cosmétiques Dermo-cosmétologie Etudes cliniques Evaluation Extraits de plantes:Extraits (pharmacie) Mélamine -- Synthèse Neurocosmétique Peau -- Soins et hygiène Persicaria tinctoria Vitamine D -- Synthèse Index. décimale : 668.5 Parfums et cosmétiques Résumé : Givaudan Active Beauty has developed an ingredient derived from Persicaria tinctoria, a botanical species of the buckwheat family, with the purpose of replicating the positive effects of sunlight. This innovative extract is designed to promote well-being and stimulate tanning without the need for actual sun exposure. Its main focus is to address the mood changes that occur during seasonal transitions, particularly in winter, when there is limited sun exposure and lower levels of vitamin D3. Givaudan conducted extensive research using in vitro models of keratinocytes and melanocytes that were co-cultured and ex vivo models to evaluate the pro-pigmenting activity. β-endorphin and oxytocin were quantified in the culture medium of keratinocytes stimulated with the extract. Vitamin D3 production was measured after the grinding of skin explants treated for several days with Persicaria tinctoria extract. Finally, clinical trials were conducted to demonstrate the extract’s ability to enhance mood and improve skin health. Corroborating the hypothesis that the extract can act as a “molecular sun”, the results demonstrated its ability to significantly increase melanin content up to +66% in skin explants in comparison with placebo cream. In keratinocytes stimulated with the extract, β-endorphins increased by +43% and oxytocin by +229%. Vitamin D3 production rose significantly to 86.5%. A positive effect on mood was confirmed in vivo in a panel of volunteers who fill specific questionnaires and said they observed a significant reduction of tiredness and an increase of affectionate mood state, leading to an overall improvement of low mood. In summary, Persicaria tinctoria extract offers myriad of sun-mimicking benefits including tanning activity, mood-enhancement and vitamin D3 stimulation. This can help address vitamin D deficiency and support overall skin and body health, particularly in regions and seasons with limited sunlight. Note de contenu : - MATERIALS AND METHODOLOGY : Evaluating pro-pigmenting activity in vitro - Evaluating pro-pigmenting activity on skin explants using Fontana Masson's staining - Enhanced positive mood and well-being : Quantifying beta-endorphin release in keratinocytes - Enhancement of positive mood and well-being : Quantifying oxytocin release in keratinocytes - Enhanced positive mood and well-being : Quantifying vitamin D3 in skin explants - Clinical evaluation of the mood-boosting properties of Persicaria tinctoria extract - RESULTS : Sun-like effects of Persicaria tinctoria extract - Clinical study on mood-enhancement - Tiredness reduction, improved mood and improved feelings of affection En ligne : https://drive.google.com/file/d/1tYgaB-ZUiZkIvrNENqI-gX9rwJnHe0XL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41326 [article]

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Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 1 (01/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 1 (01/2023) . - p. 23-35 Titre : Synthesis and retanning performance of a novel melamine resin with ultralow formaldehyde content Type de document : texte imprimé Auteurs : Zhou Ji-Bo, Auteur ; Liao Xue-Pin, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 23-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Granulométrie Mélamine -- Synthèse Mélamine à faible teneur en formaldéhyde Potentiel zeta Retannage Stabilité au stockage Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Diethanolamine, epichlorohydrin (ECH), and lysine were used to change the traditional synthesis route to address the formaldehyde emission issue of melamine resin (MR), and a novel waterborne MR retanning agent with ultralow formaldehyde content (MUF) was finally obtained. The structure of MUF was characterized by Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, and its retanning performances in wet-blue and wet-white leathers were thoroughly investigated. Results showed that the formaldehyde content of MUF was 28.05 mg/kg, which was greatly lower than that of traditional MR (3550.23/2543.45 mg/kg), and the formaldehyde contents of chrome- and TWLZ-tanned leathers retanned by MUF were only 12.68 and 8.98 mg/kg, respectively. The thickening rates of MUF-retanned leather were up to 13.40% (chrome-tanned leather) and 9.58% (TWLZ-tanned leather), and MUF showed a satisfying overall performance in retanning leather. MUF is highly promising in practical application owing to its ultralow formaldehyde content, excellent stability in aqueous solution, and satisfactory retanning behaviors. Note de contenu : - MATERIALS AND METHODS : Materials - MUF preparation - TRP synthesis - CCI preparation - MUF synthesis - Characterizatio of intermediate and final products Fourier transform infrared (FTIR) spectroscopy analysis - Nuclear magnetic resonance (NMR) spectroscopy - X-ray photoelectron spectroscopy (XPS) analysis - Storage stability and release of formaldehyde content during storage - Particle size and isoelectric point (pI) analysis - Absorption of retanning and fatliquoring agents - Thickening rates of retanned leather - Physical and mechanical strength of leather - Determination of free formaldehyde content in leather - RESULTS AND DISCUSSION : Characterization of retanning agents (FTIR analysis - NMR - XPS analysis) - Storage stability and formaldehyde determination of retanning agents - Particle size and zeta potential - Retanning performances of MUF : Absorption rates of retanning and fatliuqoring agents - Physical and mechanical strengths - Determination of free formaldehyde in leather - Table 1 : Wet-blue retanning processes - Table 2 : Wet-white retanning processes DOI : https://doi.org/10.34314/jalca.v118i1.6413 En ligne : https://drive.google.com/file/d/1qaCrrRJcWk_9qkGPtrNZylyJt7DVhboY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39162 [article]

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Synthesis of aniline 2,5 disulfonic acid modified ecofriendly melamine resins and their performance evaluation as leather retanning agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 5 (09-10/2020) . - p. 216-226 Titre : Synthesis of aniline 2,5 disulfonic acid modified ecofriendly melamine resins and their performance evaluation as leather retanning agents Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Nafisa Gull, Auteur ; Shahid Khan, Auteur ; Rashid Saleem, Auteur ; Rafi Ullah Khan, Auteur Année de publication : 2020 Article en page(s) : p. 216-226 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Eaux usées -- Analyse Formaldéhyde -- Suppression ou remplacement Mélamine -- Synthèse Microscopie électronique à balayage Poids moléculaires Retannage Rhéologie Stabilité thermique Thermogravimétrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins used in the leather retanning process are condensation products of formaldehyde which makes such resins objectionable due to environmental hazards. Due to the carcinogenic effects of formaldehyde, there is a growing demand to produce formaldehyde-free leather. This work involves the synthesis of formaldehyde free melamine resins for producing environment friendly leather with improved retanning properties and thermal stability. A series of resins was produced by condensation of glyoxal and melamine at varied mole ratios. Stability and water solubility was achieved by sulfonation with aniline 2,5 disulfonic acid at varied degrees of sulfonation. Resins were evaluated to measure the viscosity trends in series. Synthesised resins were studied for their comparative retanning properties in comparison with a commercial melamine resin as control. Mechanical properties like tensile strengths tear strengths, and elongation at break were measured and found to be improved. Similarly, the organoleptic properties were also evaluated and found to be better than for the control. Retanned pieces of leather were examined by SEM and tested for free formaldehyde content. The optimal resin was subjected to analysis by FTIR, TGA and molecular weight determination. Effluents collected from retanning baths were tested for pollution load efficiency. The results of the study confirmed that the prepared resins were supportive in producing formaldehyde-free leather with improved mechanical and organoleptic properties. The thermal stability of the resulting resins and pollution load efficiency was also found to be improved. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Preparation of aniline 2,5 disulfonic acid modified melamine glyoxal resins - RESULTS AND DISCUSSION : Schematic route - Rheology of resins - Leather application of MGADS resins as retanning agent - Mechanical properties of leather treated with MGADS resins - Organoleptic properties - SEM analysis of retanned pieces of leather - Quantitative estimation of free formaldehyde contents in leather - Thermogravimetric analysis - Structural elucidation - Molecular weight determination of optimal MGADS resin - Analysis of effluent En ligne : https://drive.google.com/file/d/1QEiBifPuL-H5we65DiaVyKq52J6mp4uk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34522 [article]

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