UV curable polyester‐based polyurethane acrylate nanocoating

Abstract

PurposeThe paper's aim is to synthesise ultraviolet (UV) curable polyurethane acrylate based on polyester polyol and to study change in its mechanical, chemical, optical and weather resistance properties with varying amount of nanosilica. It also seeks to determine its optimum loading levels for property maximisation.Design/methodology/approachNew UV curable polyurethane acrylate has been synthesised using polyester polyol, blend of isophorone diisocyanate and toluene diisocyanate and hydroxyl ethyl acrylate. This resin was incorporated with nanosilica (1‐3 per cent) on the basis of total solids. The newly synthesised material was characterised by fourier transform infrared spectroscopy, gel permeation chromatography, X‐ray diffraction and scanning electron microscopy. The mechanical, chemical and optical properties of the coating films were studied and compared.FindingsThe hardness, tensile strength and abrasion resistance show significant enhancement with increasing amount of nanosilica. It is also found that UV cured polyurethane acrylate nanocoating exhibited improved weather resistance. The optimum concentration of nanosilica for better performance is found to be 3 per cent of total solids. The improvement is the result of inherent nature of nanosilica.Research limitations/implicationsNanosilica used in present context is having 10 nm mean diameter and near about 600 m2/g surface area. Nanosilica having different particle size, surface area and surface modification can be used to improve more specific properties.Practical implicationsAddition of nanosilica particles to polyurethane acrylate coating is a simple and inexpensive method resulting in phenomenal increase in properties.Originality/valueThe new organic‐inorganic hybrid nanocoating with improved weather resistance was synthesised. These coatings could find applications in demanding fields such as automotive topcoats.

UV curable flame retardant coating: a novel synthetic approach of trispiperazido phosphate based reactive diluent

“…Introducing the appropriate fire-retardant elements into UV-curing formulation such as phosphorus, boron and silicone along with several reactive diluents based on urethane, acrylate and epoxy are reported in the literature (Palanisamy and Rao, 2007; Gao et al , 2011; Kunwong et al , 2011; Chattopadhyay and Webster, 2009) providing flame resistance to the coating. UV-curable technology has been used for polyurethane acrylate, which provides a wide range of application (Gururaj and Jagtap, 2013; Srivastava et al , 2008; Mhatre et al , 2010; Ghodsieh et al , 2014). Phosphorus- and nitrogen-based flame retardant belong to both the condensed phase and gas phase which act as flame retardancy.…”

Development of highly transparent UV‐curable nylon 6 nanofiber‐reinforced polyurethane acrylate nanocomposite coatings for pre‐coated metals

“…[1][2] Among various UV-curable resins, polyurethane acrylate (PUA) shows outstanding adhesion to substrates and excellent flexibility and impact strength. [3][4][5] Polyurethane acrylates are one of the important categories of resins used in UV-curable formulations. Mostly, their properties are affected by their functionality, type of isocyanate, type, and molecular weight of polyol used in the synthesis.…”

“…UV‐curing technology has become one of the major and promptly growing technologies within the coating industry because of the unique benefits over thermal curings, such as, energy‐efficient, low‐temperature operation, environmental friendliness (reduced VOC emissions), and high curing speed 1–2 . Among various UV‐curable resins, polyurethane acrylate (PUA) shows outstanding adhesion to substrates and excellent flexibility and impact strength 3–5 . Polyurethane acrylates are one of the important categories of resins used in UV‐curable formulations.…”