Characterization and application of low surface energy fluorinated polymer in leather finishing / Yang Qinhuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 3 (05-06/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 3 (05-06/2010) . - p. 106-110 Titre : Characterization and application of low surface energy fluorinated polymer in leather finishing Type de document : texte imprimé Auteurs : Yang Qinhuan, Auteur ; Tingyou Zhang, Auteur ; Li Zhengjun, Auteur Année de publication : 2010 Article en page(s) : p. 106-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Core-Shell Cuirs et peaux -- Finition Dispersions et suspensions Energie de surface Fluoropolymères Latex Microscopie électronique en transmission Polyacrylates Polymères en émulsion Polytétrafluoréthylène Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A lower fluorine-content core-shell latex copolymer with a fluorinated polyacrylate rich shell was manufactured by seeded emulsion polymerization and its morphology was confirmed by TEM observation and particle size analysis. The results indicated that the surface energy of a film of this latex was as low as that of PTFE (i.e. 18.5mN/m) by contact angle measurement. The water repellency of the film made from a polyurethane dispersion blended with the fluorinated core-shell latex was remarkably increased. When applied in leather finishing, a coat with excellent wet rub fastness was obtained showing the great effectiveness of the low surface energy fluorinated acrylate core-shell latex applied as a top coat additive to improve wet rub fastness performance. En ligne : https://drive.google.com/file/d/1DD8OMGk9-WS1owRDuVOFvb5RceRDU1Me/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9624 [article]

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Evaluation of the stability of organic acid-masked aluminum complexes by size exclusion chromatography / Tingyou Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 4 (04/1996)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 4 (04/1996) . - p. 95-99 Titre : Evaluation of the stability of organic acid-masked aluminum complexes by size exclusion chromatography Type de document : texte imprimé Auteurs : Tingyou Zhang, Auteur ; Eisuke Takata, Auteur ; Kunio Shirai, Auteur Année de publication : 1996 Article en page(s) : p. 95-99 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Citrate, tartrate, and acetate-masked basic aluminum chloride solutions were stored in the acidic medium (pH 2.3 to 4.2) and analyzed for the proportion of polynuclear fractions of complexes by size-exclusion chromatography (SEC). Polynuclear fractions in citrate or tartrate-masked samples decreased clearly with lowering pH and prolong storage as well as with dilution as judged by SEC. In contrast, the polynuclear fractionsin acetate-masked and unmasked basic aluminum chloride indicated a significantly high stability under the same conditions. It is explained in terms of the higher stability of olated complexes that constitute the polynuclear fractions of both samples. The proposed SEC method can serve to evalute the stability of polynuclear fractions of masked aluminum tanning agents in acidic medium. En ligne : https://drive.google.com/file/d/1RF5yr0--IEq8VXa04GTQvPX22J1YDSRx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7799 [article]

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Size-exclusion chromatography of organic acid-masked aluminum complexes and the determination of combined acid/aluminum ratio of the fractions / Tingyou Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 4 (04/1996)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 4 (04/1996) . - p. 89-94 Titre : Size-exclusion chromatography of organic acid-masked aluminum complexes and the determination of combined acid/aluminum ratio of the fractions Type de document : texte imprimé Auteurs : Tingyou Zhang, Auteur ; Yasuhiro Ishii, Auteur ; Kunio Shirai, Auteur ; Yasumasa Chonan, Auteur ; Eisuke Takata, Auteur Année de publication : 1996 Article en page(s) : p. 89-94 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four kinds of preparations of masked aluminum complexes were prepared by adding sodium citrate at 1:2, sodium tartrate at 1:2, sodium acetate at 1:4 and 3:1 equivalents to aluminum equivalent. The masked preparations were separated by size-exclusion chromatography and the fractions were analyzed for aluminum content by atomic absorption spectroscopy and for combined organic acid by ion chromatography. More than 50% of the added citrate or tartrate was taken up as an aluminum complexed component. A major proportion of polynuclear complex species combined the described acid at 0,2-0,6 equivalent ratio in the preparation. The effect of tartrate was so remarkable that it produced a considerable amount of enlarged molecular-sized complexes with tartrate content 0,6-0,8 in equivalent ratio on one hand and also produced a certain amount of small molecular-sized complexes with high tartrate contents increasing toward 1,0 in equivalent ratio on the other hand. Uptake of acetate by aluminum complex molecules was only 2,5% of the added acetate even at the addition at 3:1 equivalent ratio. However, such a high concentration of acetate broke down the size of aluminum complexes in the solution. En ligne : https://drive.google.com/file/d/1sb13MvLfeYz78roZ4HaFVvZVbHVv2eXe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7798 [article]

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The composition analysis of organic acid masked aluminium tannig solutions by ferron assay and GFC / Keyi Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 7 (07/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 7 (07/2006) . - p. 260-265 Titre : The composition analysis of organic acid masked aluminium tannig solutions by ferron assay and GFC Type de document : texte imprimé Auteurs : Keyi Ding, Auteur ; Jun Liu, Auteur ; Tingyou Zhang, Auteur Année de publication : 2006 Article en page(s) : p. 260-265 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Earlier theoretical assumptions were that, in tanning solutions, aluminum formed linear polymeric complexes similar to chromium with a maximum of four Al3+ nuclei in a complex. In this paper, the sizes of aluminum complexes, composition distribution and coordination of organic acid anions with Al3+ nuclei were determined by ferron assay, gel filtration chromatography (GFC) and low-pressure ion chromatography (LPIC). The results were as follows: (1) In the pH range of aluminum tanning process (pH=2.5-5.0), two types of organic acid masked aluminum complexes were found: Ala, mononuclear complexes, and Alb, polymeric complexes (small polymeric complexes containing 2-4 Al3+ nuclei, as well as larger "Al13 like" complexes). The percentage of Alb increased dramatically when pH was increased from 3.0 to 4.0, with more than 80% of the total Al3+ in this state at pH ≥3.5. (2) In organic acid masked aluminum salt solutions, most of the added organic acid anions were in "free" state, i.e., they were not coordinated with Al3+ nuclei. (3) In solutions of citrate masked aluminum sulfate, whatever the dose of citrate, the first elution fractions had unusually large values of [Al3+]/[Cit], some greater than 30. These results suggest that there might be something about the structure of aluminum complexes in tanning solutions that earlier theoretical assumptions did not consider. The results of this paper may provide some theoretical and practical guidance for a better understanding of the mechanism of aluminum tanning or aluminum combination tanning with other tannins. En ligne : https://drive.google.com/file/d/1wPo2jvvOOl9S4hrvhOJsPRrNE6ALYfAG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3995 [article]

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