Biobased reactive diluent for UV-curable urethane acrylate oligomers for wood coating

Abstract

Castor oil (CO)-based reactive diluent for UV-curable urethane acrylate oligomers was synthesized by the reaction of a CO with diethanolamine and the resultant product was subsequently reacted with allyl chloroformate. The reactive diluent was characterized by FTIR and 1 H NMR techniques. This reactive diluent was incorporated in a urethane acrylate oligomer and photoinitiator at different weight fractions varying from 5 to 25 wt% for UV curing. The effects of reactive diluent concentrations on the viscosity of the formulations along with mechanical, chemical, and optical properties of UV-curable coatings were studied. Furthermore, the cured films were evaluated for glass transition temperature (T g ) determined by differential scanning calorimetry and thermal stability by thermogravimetric analysis. Gel content and water absorption of UV-cured films were evaluated.

An efficient fully bio‐based reactive diluent for epoxy thermosets: 2‐[(Oxiran‐2‐ylmethoxy) methyl] furan versus a petroleum‐based counterpart

“…Reactive diluents are usually low molecular weight (LMW) compounds containing at least one reactive functionality and they reduce the overall viscosity of resin to improve its processability and react with monomers or oligomers to form uniform networks . A number of LMW monofunctional, difunctional, and multifunctional epoxies, such as n ‐butyl glycidyl ether, phenyl glycidyl ether, and cyclohexanediol diglycidyl ether, have been used as reactive diluents to reduce the viscosity of liquid epoxy resins . Cardura E10p is another mono‐functional epoxy, which is the glycidyl ester of versatic acid (Scheme ), and can be easily incorporated into different resins such as acrylic resins and epoxy resins .…”

“…Therefore, the focus is on the biomass resources as the only real equivalent of the fossil resources. Renewable resources are abundantly available, so most of them are often taken into account as inexpensive materials for producing reactive diluents . In this direction, petro‐based epoxies are being replaced by bio‐based ones.…”

Development of acrylated soybean oil‐based UV‐curable coatings with high impact strength from low viscosity oligomer

“…The development of vegetable oil‐based coatings can reduce the dependence on petrochemical products, enhance the degradation capacity of coatings, and reduce VOC emissions . Vegetable oil can be used to prepare additives and film‐forming materials (such as polyurethane, polyamide ester, polyether amide, and alkyd resins) in coatings. The combination of UV‐curable technology and vegetable oil may be a “green + green” method for solving the existing problems in the coating industry .…”

UV-curable behavior of phosphorus- and nitrogen-based reactive diluent for epoxy acrylate oligomer used for flame-retardant wood coating

“…[4][5][6][7][8] In contrast to conventional thermally cured and solvent-borne resins, UV-curable systems are widely used in various industries as well as academia due to their high efficiency, lack of volatile organic compounds (VOCs), lower energy consumption, ability to coat heatsensitive devices and circuits, lower processing cost, high chemical resistance, increased production capacity, and the broad variability of formulations. [9][10][11][12][13] Photopolymerizable resins are increasingly being used in various applications, mainly in the coating industry, graphic arts and microelectronics to replace conventional, thermally cured solvent-based coatings. 14 However, most of these UV-curable resins can catch fire in the presence of an ignition source due to their carbonaceous backbone, resulting not only in a health risk but also loss of their mechanical strength, thus limiting their application where fire protection is required.…”