[article]
| Titre : |
Bath-life issues in curing systems : a viscosity-time study |
| Type de document : |
texte imprimé |
| Auteurs : |
Sunil Dhoot, Auteur ; Perlita Taylor, Auteur |
| Année de publication : |
1998 |
| Article en page(s) : |
p. 34-36 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Adhésifs sensibles à la pression
Formulation (Génie chimique)
Rhéologie
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Viscosité
|
| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
In many reactive coating systems, such as silicones, the viscosity increases with time. Inhibitors are usually added to control this reaction process. However, the reaction still continues, and after a long time, the viscosity can be so high that it becomes difficult to maintain coatability, coverage and coat weight. In extreme cases, the coating bath can gel and can no longer be applied.
From the application standpoint, it is desirable to have a formulation with a sufficient bath-life. From a productivity standpoint, it is desirable to have higher line speeds. A faster reacting system is desired, as the applied material can be cured to a film rapidly. On the other hand, a faster curing system may have a shorter bath life. Thus, there is a necessity to balance the need for a faster curing system with the need for sufficient bath life.
The purpose of this article is to describe:
- a method for measurement of viscosity as a function of time at a controlled temperature;
- the effect of temperature on the viscosity-time profile; and
- the effect of polymer structure on the viscosity-time profile. |
| Note de contenu : |
- Continuous measurement of viscosity
- Effect of temperature on the speed of cure
- Effect of polymer structure on the viscosity-time profile |
| En ligne : |
https://drive.google.com/file/d/1UVcNH4YYIsvG5xjZZSlaKc0HN1QQmn8w/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20341 |
in ADHESIVES AGE > Vol. 41, N° 12 (12/1998) . - p. 34-36
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