Titre : |
Synthesis of cardanol based epoxy resin for high solids UV curable coatings using bio based reactive diluent : review |
Type de document : |
texte imprimé |
Auteurs : |
Rupanshu Rastogi, Auteur ; Risbabh Dwivedi, Auteur |
Année de publication : |
2019 |
Article en page(s) : |
p. 55-63 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Cardanol Diluants Epoxydes Haut extrait sec Polymères -- Synthèse Revêtements -- Additifs Revêtements -- Séchage sous rayonnement ultraviolet
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
With the increase in demand for petrochemical resources resulting in continuous depletion and increased price it's a great challenge for coating industry to look down palliatives based on renewable and sustainable materials which are ecofriendly and non-hazardous. The paper describes some important routes of developing liquid epoxy resin from Cardanol which can be made UV curable by converting into acrylates using bio based reactive diluent based on ricinolic acid(castor oil). Hence the developed product is solvent free and used for high solids coating minimizing the environmental pollution. This dark brown-colored viscous liquid obtained from shel Is of the cashew nut can be utilized fora number of polymerization reactions due to its reactive phenolic structure and a meta-substituted unsaturated al iphatic chain. The product can be implemented in primer coats of metal and wood replacing the conventional Bisphenol-A based epoxy system. The negative impact of BPA on human health and the environnent necessarily implies the el imination of BPA especially in food contact materials. Therefore there is an increasing interest within the chemical industry for non-harmful aromatic substituents to BPA, especially for the synthesis of epoxy polymers. Thus, cardanol could be an interesting substitute to BPA in some polymers such as epoxy polymers. |
Note de contenu : |
- Routes of cardanol epoxy synthesis
- UV curing
- Synthesis of cardanol epoxy acrylate (oligomer resin)
- Reactive diluent from ricinoleic acid
- Fig. 1 : CNSL origin
- Fig. 2 : Physical characteristics of CNSL
- Fig. 3 : Chemical composition of CNSL
- Fig. 4 : Chemical structure of cardanol
- Fig. 5 : Scheme for malenisation of cardanol
- Fig. 6 : Scheme for epoxidation of malenised cardanol
- Fig. 7 : Chemical structure of cardanol novolac resin
- Fig. 8 : Scheme for preparation of cardanol novolac epoxy
- Fig. 9 : Reaction scheme of cardanol and polycardanol solid line : reaction route A ; dotted line : reaction route B
- Fig. 10 : Synthesis of polyols form cardanol
- Fig. 11 : Coating process and schematic principle of UV curing
- Fig. 12 : Schematic representation of the chemical processes occurring in EB and UV curing (radical mechanism). B : backbone of the resin molecule or the reactive diluent ; PI : photo-initiator ; R. : radicals initiating the propagation reaction
- Fig. 13 : Reaction of cardanol epoxy novalac with acrylic acid to bring unsaturation in the molecule
- Fig. 14 : Trifunctional cardanol epoxy acrylate oligomer prepared by reaction of the product obtained from Fig. 6 with acrylic acid
- Fig. 15 : Reaction of epoxidied cardanol from Fig. 8 with acrylic acid
- Fig. 16 : Examples of "alpha-cleavage type" and non-cleavable "electron transfer-hydrogen abstraction type"
- Fig. 17 : Synthesis of biobased reactive diluent |
En ligne : |
https://drive.google.com/file/d/1u05gduYzEnUrj_jxK3USXMPGtu5A3AyX/view?usp=share [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31939 |
in PAINTINDIA > Vol. LXIX, N° 1 (01/2019) . - p. 55-63