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Mention de date : 03-04/1979
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Relationship of leather break to grain and flesh layers stress - Strain properties / Jorge A. Vergara in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)
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[article]
Titre : Relationship of leather break to grain and flesh layers stress - Strain properties Type de document : texte imprimé Auteurs : Jorge A. Vergara, Auteur ; Alberto Sofia, Auteur ; José Hidalgo van Dick, Auteur ; Victor D. Vera, Auteur Année de publication : 1979 Article en page(s) : p. 25-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions
Homopolymères
Matériaux -- Imprégnation
Polyacrylate d'éthyle
Polyacrylate de butyle
Polyacrylate de méthyle
Polymérisation en émulsion
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Rigidité (physique)
Rupture (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four impregnating resins (homopolymers) were produced from methyl acrylate, ethyl acrylate, butyl acrylate and methyl methacrylate monomers respectively. The emulsion polymerisation method and other chemical agents were maintained constant. Upper leathers were impregnated with these resins following a statistical design which included non-impregnated leathers as controls. Leather break and stiffness were assessed before and after the impregnating process. The elasticity modulus at 2% extension was measured for ail leathers and also in their respective grain and flesh layers after splitting. From the results obtained several concrete facts emerged. First, the leather break and stiffness increased in the following resins order: butyl acrylate < ethyl acrylate= methyl methacrylate < methyl acrylate. Relationships of the grain layer elasticity modulus to the flesh layer one for the impregnated leathers (Mi grain/Mi flesh) and for the control leathers (Mc grain/Mc flesh) were calculated. It was found that an increase in the difference between these two relationships correlated very well with the increase found in the leather break. On the other hand, when the leathers were impregnated with film forming polymers, their elasticity modulus increased proportionally to the polymer hardness increase. Note de contenu : - EXPERIMENTAL : Impregnating emulsions - Leather ande application of the impregnating resin
- RESULTS : Leather break - Stiffness - Elasticity modulus
- Table 1 : Emulsion composition
- Table 2 : Break (0 = poor ; 10 = escellent) control leather score = 5.0
- Table 3 : Stiffness (0 = soft ; 5 = extremely rigid) (control leather score = 2.0
- Table 4 : Impregnated leather elasticity modulus measured at 2% of strain (g/mm2) (control leather elasticity modulus = 1.444 g/mm2)
- Table 5 : Relative variation of elasticity modulus (ΔMR) of grain and corium layers of impregnated leather referred to the control and break increase obtained with each resin emulsionEn ligne : https://drive.google.com/file/d/1NNJQVVSKaupq3f55T1L04_U_ORQefQ0e/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34137
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 2 (03-04/1979) . - p. 25-27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007120 - Périodique Bibliothèque principale Documentaires Disponible The role of acrylics in pigskin processing / William C. Prentiss in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)
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Titre : The role of acrylics in pigskin processing Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur Année de publication : 1979 Article en page(s) : p. 28-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
Cuirs et peaux de porcs
Formulation (Génie chimique)
Polyacryliques
Retannage
Réticulation (polymérisation)
Syntans
Tannage synthétiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In my paper presented in Barcelona in 1975, various steps were discussed for processing pigskin to produce a quality leather. Stressed were the use of specialty, non-ionic degreasing surfactants at various steps in the processing sequence to control and remove grease, as well as the use of dimethyl amine and proper strength bating enzymes in the beamhouse to prepare the skins properly for subsequent tannage. Attention was given to the use of acrylics in both retanning and finishing. It is the aim of this paper to concentrate on the role of acrylics in processing pigskin, since these unique materials contribute properties to leather not easily obtained with others. Note de contenu : - Properties of the acrylic materials
- Some practical formulations
- Table 1 : Acrylic syntan - Typical values
- Table 2 : Effect of retannage on filling tempers
- Table 3 : Acrylic resin - Typical values
- Table 4 : Distribution of drum impregnating resin
- Table 5 : Effect of syntan level on resin exhaustion and leather break (8% resin applied)
- Table 6 : Effect of crosslinking on finished leather properties (high performance top coat)
- Table 7 : Retannage for white pigskin
- Table 8 : Finish system for white pigskins finish formula by volume
- Table 9 : Drum impregnation process
- Table 10 : Solid colour pigskin finish
- Table 11 : Inlay finish procedure
- Table 12 : Crunch distress finish procedureEn ligne : https://drive.google.com/file/d/1HuauSWKgdqdh42i3HGjUEWZl8skul3Xb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34138
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 2 (03-04/1979) . - p. 28-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007120 - Périodique Bibliothèque principale Documentaires Disponible Synthetic fatliquoring agents / F. Pieper in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 2 (03-04/1979)
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Titre : Synthetic fatliquoring agents Type de document : texte imprimé Auteurs : F. Pieper, Auteur Année de publication : 1979 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Alcanes
Composés organiques -- Synthèse
Emulsions
Huiles et graisses
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper surveys synthetic fatliquoring agents, mainly based on paraffins and chlorinated paraffins, as well as of those synthetic fatliquoring agents that can be obtained from natural raw materials. Also different raw material types can be used depending on the economic situation. Note de contenu : - Water-insoluble fats such as chlorinated paraffins
- Water-emulsifiable fats
- Combined fatliquoring systems
- Advantages and disadvantages of synthetic fatliquoring agents
- Binding of the fatsEn ligne : https://drive.google.com/file/d/13OKUbbd-ZdxN4Ine4Tn_ZlAsZMVsa-OY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34139
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 2 (03-04/1979) . - p. 32-34[article]Réservation
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Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 007120 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|---|
007120 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |