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Bioplastics with halogen-free flame retardants / Robert Breuer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
[article]
Titre : Bioplastics with halogen-free flame retardants : Foamed boards and foamed injection molded parts made from cellulose acetate with a halogen-free flame retardant system and environmentally friendly blowing agents Type de document : texte imprimé Auteurs : Robert Breuer, Auteur ; Yuxiao Zhang, Auteur ; Christian Hopmann, Auteur Année de publication : 2019 Article en page(s) : p. 31-36 Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose.
Agents de gonflement
Bioplastiques
Essais (technologie)
Essais de comportement au feu
Ignifugeants -- Suppression ou remplacement
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Isolation thermique
Mousses plastiques
Mousses plastiques -- Extrusion
Mousses plastiques -- Moulage par injection
Polymères expansés
PolystyrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Foamed polystyrene boards (XPS) have been used for generations in thermal insulation applications, e.g. for buildings. Due to its comparable mechanical and thermal properties, bio-based cellulose acetate (CA) represents a promising, sustainable alternative which is also an interesting material for technical components due to its heat resistance. However, producing such parts by foam extrusion or foam injection molding with halogen-free flame retardant systems and environmentally friendly blowing agents is a challenge. Note de contenu : - Materials used
- Equipmentfor foam extrusion trials
- Equipment for foam injection molding trials
- Foam extrusion of CA compounds with flame retardant system
- Foam injection molding trials
- Resulting density of the extruded foam boards
- Fire behavior of the extruded foam boards
- Injection pressures and foam structures of the injection-molded test specimens
- Fire behavior of the injection molded test specimens
- Figure : Samples of foamed cellulose acetate with halogen-free flame retardant system after the flammability test
- Fig. 1 : Material composition of the tested CA compounds and the polystyrene reference
- Fig. 2 : The foam board extrusion line used within the project of the IKV
- Fig. 3 : ProFoam system for introducing the blowing agent into the cellulose acetate
- Fig. 4 : Foam board densities of the CA compounds investigated in foam extrusion
- Fig. 5 : Exemplary foam samples after the flammability test : if the measuring mark is not reached, the test is passed. The sample on the right did not pass the test
- Fig. 6 : Measured process pressures in foam injection molding
- Fig. 7 : Foam structure of th einjection-molded components : the microscopic images show different homogeneity in cell size and cell distribution depending on the blowing agent and compound formulationEn ligne : https://drive.google.com/file/d/1gCSZicOJ1-1a-WJW4Udxs5dc4oVSXLor/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31820
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 1-2 (01-02/2019) . - p. 31-36[article]Réservation
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Titre : CO2 foaming made easy : Tailor-made blowing agent mixtures in foam sheet extrusion Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Robert Breuer, Auteur ; Philipp Gladbach Année de publication : 2018 Article en page(s) : p. 14-18 Langues : Anglais (eng) Catégories : Agents d'expansion (chimie)
Dioxyde de carbone
Malaxeurs et mélangeurs
Mélanges (chimie)
Mousses plastiques -- Extrusion
Rhéologie
Solubilité
ViscositéIndex. décimale : 668.4 Plastiques, vinyles Résumé : In industrial practice, CO2 has so far only partially established itself as a blowing agent in foam sheet production because it is poorly soluble in plastics and therefore requires high process pressures. However, co-blowing agents can increase the solubility of carbon dioxide, so that lower pressures and lower temperatures are sufficient for processing. Note de contenu : - IKV foam extrusion pilot line : two injection ports for CO2 (front) and co-blowing agents (back) are used for foaming with blowing agent mixtures
- Fig. 1 : Inline rheometer die with inspection window, bypass outlet, pressure transducers and adjustable die gap. Sketched are also emerging gas bubbles
- Fig. 2 : IKV foam extrusion line : long single-screw extruder with direct injection of blowing agent, static mixer and annular sheet die
- Fig. 3 : Solubility of the blowing agent mixture as a function of the co-blowing agent concentration : solubility increases with increasing proportion of the more soluble co-blowing agent
- Fig. 4 : Foaming pressure as a function of the blowing agent concentration : blowing agent mixtures allow lower foaming pressure to be used
- Fig. 5 : Viscosity of the gas-loaded melt as a function of the co-blowing agent quantity : the viscosity decreases with increasing blowing agent content and increasing molar co-blowing agent quantity in the polymer melt
- Fig. 6 : Nucleation density for a blowing agent mixture of 2.5 wt. % CO2 and 0.5 wt. % ethanol as a function of the reduced die pressure p*: with increasing nucleation density the structure is more fine-celledEn ligne : https://drive.google.com/file/d/11R1HM-4MATBowlULjA2FUGOpqnnhiwNH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31082
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 8 (08/2018) . - p. 14-18[article]Réservation
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