Recent developments in structural adhesives / Shubham Kharat in PAINTINDIA, Vol. LXX, N° 12 (12/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 67-71 Titre : Recent developments in structural adhesives Type de document : texte imprimé Auteurs : Shubham Kharat, Auteur Année de publication : 2020 Article en page(s) : p. 67-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs structuraux Adhésion réversible Nanoparticules Polyuréthanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The function of structural adhesive is to hold surfaces together which can tolerate high loads. The structural adhesives are used for application in which the adherents experience large stress up to their yield point. The structural adhesive bond must be capable of transmitting stress without loss of integrity within design limit. In case of polyurethane structural adhesives, the development in recent time is observed in its raw material selection. Polyurethane is synthesized using polyester polyol and (di) isocyanate. Prominently, polyester polyols which are used in adhesive industry are synthesised using Isophthalic acid (IPA), phthalic anhydride (PAn) and Dimethyl terephthalate (DMT). The adhesive is easy to manufacture, transport and application. Though it lias many advantages, but the adhesive made from IPA, PAn and DMT are costlier than other adhesives available in market. Adding to this, since the density of IPA is high; it contains lesser volume when consumption is considered. To overcome this, purified terephthalic acid (PTA) is introduced as replacement raw material for these acids. It is cheaper and has lesser volume as compared to IPA. Recently, various other new technologies have been introduced in the sector of structural adhesives. Reversible adherence technology has made it easy to repair the industrial devices and easy recycling of the raw materials. Reactive hot melt urethanes, reactive acrylic adhesive, UV curing aerobic acrylics, cyanoacrylates adhesive, smart adhesive joint by thermally expandable particles, etc. are the various recent developments which have been made in structural adhesive field. A new concept of self healing of the adhesive has been introduced in this paper which mainly focuses on the curing of the cracks developed in adhesive joints. Nanoparticles and hollow glass fibres pay an important role self healing of the cracks in adhesive joints. Note de contenu : - INTRODUCTION : Adhesive selection - Following are some of the advantages of PTA over other raw materials - Reversible adherence - Reactive hot melt polyurethane (RHMUs) - Reactive acrylic adhesive - Cyanoacrylates adhesives - UV curing aerobic acrylics - Smart adhesive joints by use of nanoparticles - Nanoparticles in adhesive joints - Self healing materials : concepts and recent development - Hollow glass fibers - Fig. 1 : Cure profile of condensation versus addition polymerization - Fig. 2 : Model of expansion mechanism - Fig. 3 : Schematic representation of nanoparticle movement during crack growth in thermoplastics - Fig. 4 : Micro-capsule based self healing concept - Fig. 5 : Schematic representation of hollow fibers self-healing concept En ligne : https://drive.google.com/file/d/1U34u28WSSLaWf2KVo1iKS0QWEjuZrVam/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35202 [article]

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