Bactericides for pre-treatment in suspension drying of hides and skins : 1981 field trials in the Gambia / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 74-85 Titre : Bactericides for pre-treatment in suspension drying of hides and skins : 1981 field trials in the Gambia Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur Année de publication : 1983 Article en page(s) : p. 74-85 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Borique, Acide Chimie analytique 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 -- Conservation Cuirs et peaux -- Séchage Fluorure de silicium Fluorures Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Protection against development of putrefaction during suspension drying of hides during the West African wet season was investigated. Hides were dipped for 60 min in a saturated solution of sodium silicofluoride or boric acid or sprayed with a 10% solution of Vantocil IB immediately after flaying and fleshing. Both boric acid and silicofluoride treatments gave effective protection without adverse effect on leather-making quailties of the treated stock. The Vantocil spray treatment gave a significant improvement in preservation compared to untrerated hides but was not as effective as the boric acid or silicofluoride dip treatments. At present the use of silicofluoride is promising as the most cost-effective treatment. Note de contenu : - METHODS : Preservation treatment - Selection, preparation and handling of raw material - Drying rates and moisture content - Development of staleness during drying - Evaluation of quality of cure - Evaluation of hide quarters during tannery processing - Evaluation of the crust leathers - RESULTS : Moisture content and drying raies - Development of staleness during drying - Observations during tannery processing - Observations on the crust leathers - DISCUSSION : Preservative effect of the different treatments - Comments on the TTC and gelatin film test results - Comments on chemical analysis - Effects on leather-making properties - Cost-effectiveness En ligne : https://drive.google.com/file/d/1pUVjUIBhypPOBOJWEr22I5A_2VepoRRw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34189 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007130	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings / Wei Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 607-616 Titre : Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings Type de document : texte imprimé Auteurs : Wei Dong, Auteur ; Lei Zhou, Auteur ; Yanni Guo, Auteur ; Yining Tang, Auteur ; Rong Pan, Auteur ; Mengli Liu, Auteur ; Deliang He, Auteur Année de publication : 2022 Article en page(s) : p. 607-616 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Benzotriazole Caractérisation Copolymère styrène acrylique Copolymères en émulsion Enrobage (technologie) Essais accélérés (technologie) Fluorure de silicium Formulation (Génie chimique) Polymérisation en émulsion Potentiel zeta Rayonnement ultraviolet -- Absorption Résistance aux conditions climatiques Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the weather ability and thermal stability of styrene-acrylic polymer emulsion coatings, a series of novel styrene-acrylic polymer emulsion modified with 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole (HMEB), hexafluorobutyl methacrylate (HFMA), and vinyl-trimethoxysilane (VTMS) were prepared through semi-continuous seed emulsion polymerization. The emulsions and their coatings were characterized by Fourier transform infrared spectroscopy, ultraviolet absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy, dynamic laser scattering, transmission electron microscopy, zeta potential, thermogravimetric analysis, and artificially accelerated aging test. According to the results, the new polymer emulsion had superior UV absorption from 308 to 364 nm. Moreover, the coating performed the best anti-aging stability when the content of HMEB, HFMA, and VTMS reached 4%, 2%, and 3%, respectively. After the 1000 h aging test, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 6.86% and 51.10%, while the unmodified coatings were 16.05% and 72.22%, respectively. Furthermore, the thermal stability and water resistance of the coating were improved by fluorine and silicon monomers. The initial decomposition temperature was increased from 327 to 339°C. Moreover, the UV stabilization mechanism is preliminarily discussed. Note de contenu : - EXPERIMENTAL : Materials - Pre-emulsification - Emulsion polymerization - Coating preparation - Characterization - RESULTS AND DISCUSSION : Basic properties of emulsions and the coatings - Zeta potential and DLS of emulsions - Morphology of emulsion particles - Chemical structure of emulsion polymer - Chemical composition of emulsion coatings - UV absorption property of coatings - Thermal stability of emulsion coating - The aging acceleration test of emulsion coatings - Protective properties of emulsion coatings - Table 1 : Emulsion polymerization formula - Table 2 : Basic properties of emulsions and the coatings - Table 3 : Surface composition of different coatings/atomic % DOI : https://doi.org/10.1007/s11998-021-00550-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00550-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37291 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23408	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The recycling of silicofluoride and boric acid liquors for hide preservation / J. C. Barrett in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 146-149 Titre : The recycling of silicofluoride and boric acid liquors for hide preservation Type de document : texte imprimé Auteurs : J. C. Barrett, Auteur ; I. B. Leach, Auteur ; M. R. Ascough, Auteur Année de publication : 1984 Article en page(s) : p. 146-149 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bain de trempe -- Recyclage Borique, Acide Cuirs et peaux -- Conservation Fluorure de silicium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Suspension drying is a long-established method of curing hides and skins still practised today in many parts of the world, but a major disadvantage is that adverse climatic conditions can cause major Tosses. For example, in West Africa during the wet season putrefaction of hides caused by delayed drying is extensive. Barrette reviewed bactericidal chemicals potentially suitably for treatment of hides and skins prior to drying to avoid this problem and selected methods were evaluated in field trials in the Gambia in 1981. The immersion of cattle hides in a saturated solution of either sodium silicofluoride (SSF) or boric acid for 60 min after flaying and fleshing prior to conventional suspension drying was found to give effective protection against putrefaction during drying periods of up to six days. No adverse effects on leather-making qualities of the raw stock could be attributed to the bactericidal pre-treatments. A practical system for pre-treating hides with bactericides will benefit from recycling of dip liquors to achieve economy in chemical usage. This paper describes experiments carried out in the Gambia in 1982 to investigate the scope for recycling SSF and boric acid liquors for hide preservation. Experiments were also carried out to investigate the scope for reducing the period of immersion of hides while retaining effective preservation. Note de contenu : - Raw material - Preliminary experiments on reduced treatment time - Experiments on receiving unreplenished bactericide liquors : Results with SSF - Results with boric acid - Experiments on recycling replenished SSF liquors - Investigation of the "exhaustion" of recycled SSF liquors - Table 1 : Assessment of hide quality in unreplenished SSF liquor recycling experiments - Table 2 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments - Table 3 : Assessment of hide quality in unreplenished boric acid liquor recycling experiments En ligne : https://drive.google.com/file/d/1xqamOshukt7PNwdxPWvhdu4ixPXuqhni/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34151 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
007131	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)