[article]
| Titre : |
Oleochemical polyols |
| Titre original : |
New raw materials for polyurethane applications |
| Type de document : |
texte imprimé |
| Auteurs : |
Rainer Höfer, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 26-37 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In order to use natural oils as raw materials for polyurethane production, multiple hydroxyl functionality is required, Hydroxyl functionality naturally occurs in castor oil and can be introduced synthetically In other natural oils with saturated sites by epoxidation followed by ring opening. This can be accomplished by reaction with alcohols, amino alcohols or acids. The main fields of application of these novel oleochemical polyols are areas, where hydrophobicity, hardness, flexibility and mechanical and chemical resistance are needed. Usage of oleochemical polyols in VOC-free, two component polyurethane coatings and floorings, as well as in thermoplastic polyurethanes which are described In the text provides an overview of the broad range of applications which are accessible at present. |
| Note de contenu : |
1 How are oleochemical polyols being synthesised ?
1.1. Drying oils - reactions at the double bonds of unsaturated fatty acids - Hydroxyl functional natural oils - Hydroxyl functional fatty acid derivatives - ester linkages should be avoided
1.2 Different types of reactions lead to dicarboxylic acids
1.3 Hydrogenation leads to saturated and unsaturated fatty alcohols
1.4 Dimerdiol oligomers with improved chemical stability
2 Usage of oleochemical polyols :
2.1 Solvent-free two-pack PUR systems can be used for different substrates
2.2 Thermoplastic polyurethanes (TPU) are hydrophobic materials
2.3 Aqueous polyurethane dispersions show excellent abrasion resistance
2.4 PUR high solids
3. A wide range of applications is accessible |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10982 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 3/00 (03/2000) . - p. 26-37
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Oleochemical polyols in EUROPEAN COATINGS JOURNAL (ECJ), N° 3/00 (03/2000)
