[article]
| Titre : |
A novel cyclocarbonate based technology for isocyanate free polyurethane |
| Type de document : |
texte imprimé |
| Auteurs : |
Poonam R. Datir, Auteur |
| Année de publication : |
2007 |
| Article en page(s) : |
p. 71-88 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Résistance au rayonnement ultraviolet
Revêtements bi-composant
Revêtements sans isocyanates
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The correct requirements of product development is "Gentle to the Earth and living environment" philosophy. Today's customer is much more educated and sophisticated when contemplating materials to a definite space. Also, increasing global awareness of the need to protect our environment and safeguard the health of the employees and consumers creates the demand for developing "green" products in coatings and this has become a significant driver for innovation today. Two-component urethane chemistry continues to be the leading technology for high performance coating systems. With a proven track record of polyurethane coating, known for its good UV-resistance, aesthetic and non-yellowing properties that span decades, why polyurethanes are apparently under the gun so much these days? The answer has to do with the safety implications associated with the group called as "Isocyanate (-N-C=O)". It is this highly reactive isocyanate group in a polyisocyanate molecule that co-reacts with the active hydrogen atom of a polyol to form two component polyurethane. These concerns regarding the toxicity of isocyanates has led to the development of ambient curing Non Isocyanate Polyurethanes (NIPU). Synthesis of NIPU is based on reaction of cyclocarbonate and amine that does not use the toxic material like isocyanate. Cyclocarbonates can be synthesized from corresponding epoxy precursors. The synthesized cyclocarbonates are reacted further with primary amines to get linear or network non isocyanate based polyurethanes. These non - isocyanate polyurethanes are modified polyurethane material with lower permeability, increased resistance properties with safe manufacturing process, when compared to conventional polyurethane. NIPU systems displaying UV stability, thermal stability, chemical resistance and fire resistance along with water solubility have been described in this paper. |
| Note de contenu : |
- Chemistry of polyurethanes
- Advantages of polyurethanes
- Need to develop isocyanate free polyurethane
- Non-isocyanate polyurethane (NIPU)
- Advantages of NIPU over conventional PU
- Toxicity of amines as compared to isocyanates
- Hybrid non-isocyanate polyurethane (HNIPU)
- Applications
- Advances in NIPU-water soluble NIPU
- Commercial aspect of NIPU |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11484 |
in PAINTINDIA > Vol. LVII, N° 5 (05/2007) . - p. 71-88
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