An innovative new application of oxidizing agents to accelerate chamois leather tanning / Ono Suparno in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 12 (12/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 12 (12/2011) . - p. 360-366 Titre : An innovative new application of oxidizing agents to accelerate chamois leather tanning : Part I : The effects of oxidizing agents on chamois leather quality Type de document : texte imprimé Auteurs : Ono Suparno, Auteur ; E. Gumbira-Sa'id, Auteur ; Ika A. Kartika, Auteur ; Muslich Mubarak, Auteur ; Syahrun Mubarak, Auteur Année de publication : 2011 Article en page(s) : p. 360-366 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux de Chamois Huile de graine de caoutchouc Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A disadvantage of chamois leather tanning practiced nowadays is that its oxidation process takes relatively long time, i.e. 9 to 14 days. The use of an oxidizing agent, such as sodium percarbonate was reported to shorten the tanning oxidation process. However, the price of this oxidizing agent is relatively high; a constraint in its application. Other oxidizing agents, such as hydrogen peroxide, may have the same function of accelerating the process. The objectives of this study were to investigate the effects of type and concentration of oxidizing agents in order to obtain the optimum combination of process acceleration and chamois leather characteristics. This study consisted of the leather tanning with rubber seed oil with oil oxidation comparing two types of oxidizing agents at three concentrations of each oxidizing agents; testing of physical, chemical, and organoleptic properties of the leathers, and microscopic studies of the leathers. The results of this study indicate that hydrogen peroxide could be used as oxidizing agents for the chamois leather manufacture, since the chamois leather produced met the quality standards. The best treatment of this trial was hydrogen peroxide at 6% (w/w based on of the weight of rubber seed oil applied). The use of hydrogen peroxide could shorten the oxidation process from 9-14 days to about three days. Note de contenu : - EXPERIMENTAL : Materials and equipment - Pretanning - Oil tanning - Leather analyses - Microscopic studies - RESULTS AND DISCUSSION : Tanning process - Chemical properties of leather - pH - Ash content - Oil content - Physical properties of leather (Thickness - Tensile strength - Elongation at break - Tear strength - Water absorption) - Organoleptic properties - Microscopic studies En ligne : https://drive.google.com/file/d/1DT0vjhJnwPHCFJ2AYUGuyRc3bh3x2OdG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12897 [article]

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Correlative studies on the properties of rubber seed and soybean oil-based alkyd resins and their blends / Ikhazuagbe H. Ifijen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 459-467 Titre : Correlative studies on the properties of rubber seed and soybean oil-based alkyd resins and their blends Type de document : texte imprimé Auteurs : Ikhazuagbe H. Ifijen, Auteur ; Hamilton D. Odi, Auteur ; Muniratu Maliki, Auteur ; Stanley O. Omorogbe, Auteur ; Aireguamen I. Aigbodion, Auteur ; Esther U. Ikhuoria, Auteur Année de publication : 2021 Article en page(s) : p. 459-467 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Formulation (Génie chimique) Huile de graine de caoutchouc Huile de soja Mélanges (chimie) Polyalkydes Polyesters Polymères -- Synthèse Revêtements organiques Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : This study aims at synthesizing alkyd resins from rubber seed oil (RSO), soybean oil (SBO), and their blends via the monoglyceride route. Oil extracted from rubber seeds was blended with soybean oil at various blending ratios (80:20, 70:30, 50:50, 30:70, and 10:90). Thereafter, the blends were employed in the synthesis of polyesters (alkyd resins) via alcoholysis technique. The alkyd samples synthesized from the RSO, SBO, and their respective blends were characterized for comparative purpose. The RSO-/SBO-based alkyds and aforementioned blends have iodine values of 157.90/142.00, 152.44, 149.90, 143.16, 142.26, and 142.41 gI2/100 g and saponification values of 216.21/228.61, 203.67, 171.04, 161.97, 142.89, and 135.62 mgKOH/g, respectively. The drying property (set-to-touch time and the tack free) of the 100% RSO-based alkyd resin did not experience any significant improvement as the blending proportion of SBO in RSO increases. The tack-free and dry-through times for the blends were estimated to be around 129–133 and 236–243 min, respectively. Huggins and Kraemer viscosity relationship was used to extrapolate the intrinsic viscosities of the RSO- and SBO-based alkyds and their corresponding blends. The blends showed resistance to brine, water, and acid. However, only some exhibited fair resistance to alkali. The results from the investigation revealed that the alkyds prepared using a blend of RSO/SBO oil possess coating properties whose values are comparable to those of commercial polyesters. However, the studied SBO cannot be considered as good blending oil with RSO for the preparation of alkyd for the improvement of drying properties. Note de contenu : - MATERIALS AND METHODS : Synthesis of alkyd resin samples - Characterization of the alkyd samples - Chemical constituent of RSO and SBO - Preparation of alkyd coatings for performance characteristics - Viscosity measurement - RESULTS AND DISCUSSION : Physiochemical characteristics of the alkyd samples - Drying characteristics of the alkyd films - Viscosity analysis - Table 1 : Formulation of the synthesized alkyd resin - Table 2 : Physiochemical properties of the RSO and SBO - Table 3 : Physico-chemical properties of RSO and SBO alkyd resin - Table 4 : Drying schedule for formulated alkyd resin - Table 5 : Chemical resistance of the alkyd film to different solvent media - Table 6 : Estimated solution parameters of alkyd samples - Scheme 1 : Monoglyceride process of rubber seed oil-modified alkyd synthesis - Scheme 2 : Monoglyceride process of soybean oil-modified alkyd synthesis DOI : https://doi.org/10.1007/s11998-020-00416-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00416-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35607 [article]

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Synthesis of rubber seed oil waterborne alkyd resin from glucitol / Chigozie F. Uzoh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1727-1735 Titre : Synthesis of rubber seed oil waterborne alkyd resin from glucitol Type de document : texte imprimé Auteurs : Chigozie F. Uzoh, Auteur ; M. C. OBele, Auteur ; U. M. Umennabuife, Auteur ; Okechukwu D. Onukwuli, Auteur Année de publication : 2019 Article en page(s) : p. 1727-1735 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Huile de graine de caoutchouc Polyalkydes Polymères -- Propriétés mécaniques Polymères -- Synthèse Polymérisation Résistance chimique Revêtements organiques Solubilité Sorbitol Index. décimale : 667.9 Revêtements et enduits Résumé : Solubility properties of alkyd resins from phthalic and maleic anhydrides, glucitol and rubber seed oil (RSO) as raw materials were examined. Four types of glucitol-based medium oil length alkyd resins (ALKYD A–D, two for each acid anhydride) samples were formulated with phthalic anhydride, maleic anhydride, glucitol aqueous solution, and RSO. The physical, chemical, and film characteristics of the glucitol-modified alkyd resins were examined, and the result was compared with the standard alkyd resins and soybean-based alkyd resin. It was observed that all samples were soluble in xylene and butoxyethanol but not water. All of the samples have varying solubilities in water/xylene ratio (%) and complete solubility in water/butoxyethanol (%) ratio of 40:60, 50:50, and 60:40, respectively. ALKYD A is soluble in all solvents except water where it was sparingly soluble at room temperature. The spectral analysis revealed the polyesterification reaction and hydrogen-bonding integrity of the alkyd resins and the polybasic acid. The physical and chemical properties and the performance indices of the glucitol-based alkyd resin results show that they possess acceptable drying properties, chemical resistance, and mechanical properties. Performance of ALKYD A and C gave nearly the same result as the standard alkyd resins and soybean-based alkyd resin. It has potential as a choice waterborne binder for alkyd resin paint and can help in reducing VOC. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Features of crude, neutralized, and dehydrated RSO - Chemical formation of sorbitol-based alkyd resin and their solubility characteristics - Features of the lkyd resin samples relative to varnishes performance - The film characteristics of glucitol-based waterborne resins DOI : 10.1007/s11998-019-00235-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00235-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33426 [article]

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