Preparation of polyols and polyurethane foams from olein by-product of tanning industry / Manoel Rodrigues da Silva in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 11 (11/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 11 (11/2022) . - p. 489-497 Titre : Preparation of polyols and polyurethane foams from olein by-product of tanning industry Type de document : texte imprimé Auteurs : Manoel Rodrigues da Silva, Auteur ; Joao Antonio Pessoa da Silva, Auteur ; Cesar Liberato Petzhold, Auteur ; Nilo Sérgio Medeiros Cardozo, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2022 Article en page(s) : p. 489-497 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Formulation (Génie chimique) Mousses (matériaux) -- Propriétés mécaniques Mousses plastiques Mousses plastiques -- Propriétés physiques Oléine L'oléine ou trioléine est un triglycéride naturellement présent dans les huiles et les matières grasses solides végétales. Sa densité est de d = 0,89 et sa formule brute est : C57H104O6 Il s'agit du triester de l'acide oléique avec le glycérol (propan-1,2,3-triol). L'oléine est utilisée pour la fabrication du savon de marseille suivant la réaction de saponification : C57H104O6 +3(Na+ + HO-)= 3(C17H33-CO2- , Na+) + CH2OH-CHOH-CH2OH (Wikipedia) Polymères -- Synthèse Polyols Polyuréthanes Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Olein produced from the solid residues of the tanning industry is already employed as raw material to obtain greasing oil for leather. However, new applications for this product may be advantageous regarding environmental impact and sustainability of this industry. In this work, flexible polyurethane foams (FPUFs) were prepared from polyols obtained from olein. A polyol from olein was prepared through alkaline glycerolysis. The glycerolysis conditions of temperature, glycerol/olein molar ratio, amount of catalyst and reaction time were optimized using a 24 factorial design, resulting in an olein polyol containing around 75% of monoacylglycerols, hydroxyl value (388.68±0.40 mg KOH.g-1), and hydroxyl functionality of 2.89. FPUFs were prepared at NCO/OH ratios of 1.2:1 and 1.3:1, using an aliphatic hexamethylene diisocyanate trimer and water as foaming agent. The foams were characterized through FTIR, thermogravimetry, morphology, extractable materials, and mechanical properties. Characteristics urethane/urea groups formation were verified by FTIR as well as typical mass loss steps in the thermal decomposition curves. The foams morphology showed a structure composed mainly for polygon-type closed-cells. The obtained FPUFs presented a content of extractable materials lower than 3%. The mechanical properties of the foams were dependent on the NCO/OH ratio, and the foam prepared at the ratio of 1.2:1 stood out as a potential material to be used in the production of mattresses. This study demonstrated the feasibility of transforming olein, a solid residue of the tanning industry, as a precursor to prepare PU foams, which may be a promising material for mattress applications, considering the observed features. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the olein polyols (OP) - Preparation of the flexible polyurethane foams (FPUF) - Physical and mechanical properties and extractable material of FPUFs - Analytical methods - RESULTS AND DISCUSSION : Glycerolysis of olein - Characterization of olein and olein polyol 2 (OP2) - Characterization of the produced flexible polyurethane foams (FPUFs) - Structural characterization - Ecxtractable material - Physical and mechanical properties - Table 1 : FPUFs formulations - Table 2 : Experiments performed according to a 2 factorial design and the respective results of yield - Table 3 : MAG, DAG, and TAG yields : effects of the significant factors (p<0.05) from the ANOVA on data of table 1 - Table 4 : Properties of olein and OP2 - Table 5 : Extractable materials, physical and mechanical properties of the prepared FPUFs DOI : https://doi.org/10.34314/jalca.v117i11.6295 En ligne : https://drive.google.com/file/d/18OoRZqMgxzEjPqzOIHMgeMS7ElvUOiVr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38342 [article]

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