Abstract
Synthesis, characterization, and coating performance of castor oil (CO)-based waterborne hyperbranched polyurethane acrylate (WHPUA) emulsions are highlighted in this work. Herein, a second-generation CO-based hyperbranched polyester (C20) was synthesized by introducing the renewable CO as a B3 core and dimethylolpropionic acid as an AB2 monomer via a pseudo-one-pot condensation procedure. Three types of CO-based WHPUA emulsions were prepared through the addition of the hyperbranched C20 with maleic anhydride (MA) and the isocyanate-bearing semiadduct (IPDI-HEA) at different MA/IPDI-IH molar ratios without the addition of any emulsifiers. The prepared emulsions were further formulated into UV-curable coating formulations and exposed to a medium-pressure mercury lamp. Consequently, the obtained UV-cured coatings exhibited outstanding adhesion performance, excellent transparency, and an acceptable degree of final double bond conversion. Owing to a relatively low concentration of hydrophilic units and a large number of acrylate functionalities in the waterborne oligomer, the obtained films were endowed with high crosslinking density and low hydrophilic nature, thus producing enhanced tensile strength, pencil hardness, water resistance, and chemical resistance. Due to their combination of renewable materials, a waterborne system and a UV-curing technique, these CO-based WHPUA emulsions offer promising opportunities to be used as environmentally friendly coatings.
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References
Zhang, QY, Huang, C, Wang, HX, Hu, MJ, Li, HB, Liu, XH, “UV-Curable Coating Crosslinked by a Novel Hyperbranched Polyurethane Acrylate with Excellent Mechanical Properties and Hardness.” RSC Adv., 6 (109) 107942–107950 (2016)
Yu, B, Wang, X, Xing, WY, Yang, HY, Song, L, Hu, Y, “UV-Curable Functionalized Graphene Oxide/Polyurethane Acrylate Nanocomposite Coatings with Enhanced Thermal Stability and Mechanical Properties.” Ind. Eng. Chem. Res., 51 (45) 14629–14636 (2012)
Guler, B, Onen, HA, Karahasanoglu, M, Serhatli, E, Canak, TC, “Preparation and Characterization of Chalcone Functional Urethane Acrylates for Coating Applications.” Prog. Org. Coat., 109 152–159 (2017)
Fang, ZH, Duan, HY, Zhang, ZH, Wang, J, Li, DQ, Huang, YX, Shang, JJ, Liu, ZY, “Novel Heat-Resistance UV Curable Waterborne Polyurethane Coatings Modified by Melamine.” Appl. Surf. Sci., 257 (11) 4765–4768 (2011)
Yuan, CD, Wang, MY, Li, HT, Wang, ZW, “Preparation and Properties of UV-Curable Waterborne Polyurethane-Acrylate Emulsion.” J. Appl. Polym. Sci., 134 (34) 45208 (2017)
Zhang, T, Wu, W, Wang, X, Mu, Y, “Effect of Average Functionality on Properties of UV-Curable Waterborne Polyurethane-Acrylate.” Prog. Org. Coat., 68 (3) 201–207 (2010)
Wang, J, Zhang, H, Miao, Y, Qiao, L, Wang, X, Wang, F, “UV-Curable Waterborne Polyurethane from CO2-Polyol with High Hydrolysis Resistance.” Polymer, 100 219–226 (2016)
Shin, M, Lee, Y, Rahman, M, Kim, H, “Synthesis and Properties of Waterborne Fluorinated Polyurethane-Acrylate Using a Solvent-/Emulsifier-Free Method.” Polymer, 54 (18) 4873–4882 (2013)
Xu, J, Rong, X, Chi, T, Wang, M, Wang, Y, Yang, D, Qiu, F, “Preparation, Characterization of UV-Curable Waterborne Polyurethane Acrylate and the Application in Metal Iron Surface Protection.” J. Appl. Polym. Sci., 130 (5) 3142–3152 (2013)
Zhang, S, Chen, Z, Guo, M, Bai, H, Liu, X, “Synthesis and Characterization of Waterborne UV-Curable Polyurethane Modified with Side-Chain Triethoxysilane and Colloidal Silica.” Colloids Surf. A Physicochem. Eng. Asp., 468 1–9 (2015)
Bai, CY, Zhang, XY, Dai, JB, Zhang, CY, “Water Resistance of the Membranes for UV Curable Waterborne Polyurethane Dispersions.” Prog. Org. Coat., 59 (4) 331–336 (2007)
Asif, A, Shi, W, “UV Curable Waterborne Polyurethane Acrylate Dispersions Based on Hyperbranched Aliphatic Polyester: Effect of Molecular Structure on Physical and Thermal Properties.” Polym. Adv. Technol., 15 (11) 669–675 (2004)
Voit, BI, Lederer, A, “Hyperbranched and Highly Branched Polymer Architecturess Synthetic Strategies and Major Characterization Aspects.” Chem. Rev., 109 (11) 5924–5973 (2009)
Voit, B, “Hyperbranched Polymers-All Problems Solved After 15 years of Research?” J. Polym. Sci. Part A Polym. Chem., 43 (13) 2679–2699 (2005)
Tasic, S, Bozic, B, Dunjic, B, “Synthesis of New Hyperbranched Urethane-Acrylates and Their Evaluation in UV-Curable Coatings.” Prog. Org. Coat., 51 (4) 321–328 (2004)
Xiang, H, Wang, X, Xi, L, Dong, H, Hong, P, Su, J, Cui, Y, Liu, X, “Effect of Soft Chain Length and Generation Number on Properties of Flexible Hyperbranched Polyurethane Acrylate and Its UV-Cured Film.” Prog. Org. Coat., 114 216–222 (2018)
Flory, PJ, “Molecular Size Distribution in Three Dimensional Polymers. VI. Branched Polymers Containing A-R-Bf−1 Type Units.” J. Am. Chem. Soc., 74 (11) 2718–2723 (1952)
Asif, A, Hu, L, Shi, W, “Synthesis, Rheological, and Thermal Properties of Waterborne Hyperbranched Polyurethane Acrylate Dispersions for UV Curable Coatings.” Colloid Polym. Sci., 287 (9) 1041–1049 (2009)
Asif, A, Huang, C, Shi, W, “Structure-Property Study of Waterborne, Polyurethane Acrylate Dispersions Based on Hyperbranched Aliphatic Polyester for UV-Curable Coatings.” Colloid Polym. Sci., 283 (2) 200–208 (2004)
Asif, A, Huang, CY, Shi, WF, “Photopolymerization of Waterborne Polyurethane Acrylate Dispersions Based on Hyperbranched Aliphatic Polyester and Properties of The Cured Films.” Colloid Polym. Sci., 283 (7) 721–730 (2004)
Asif, A, Shi, W, “Synthesis and Properties of UV Curable Waterborne Hyperbranched Aliphatic Polyester.” Eur. Polym. J., 39 (5) 933–938 (2003)
Asif, A, Shi, W, Shen, X, Nie, K, “Physical and Thermal Properties of UV Curable Waterborne Polyurethane Dispersions Incorporating Hyperbranched Aliphatic Polyester of Varying Generation Number.” Polymer, 46 (24) 11066–11078 (2005)
Zhang, J, Xu, H, Hu, L, Yang, Y, Li, H, Huang, C, Liu, X, “Novel Waterborne UV-Curable Hyperbranched Polyurethane Acrylate/Silica with Good Printability and Rheological Properties Applicable to Flexographic Ink.” ACS Omega, 2 (11) 7546–7558 (2017)
Lin, X, Zhang, S, Qian, J, “Synthesis and Properties of a Novel UV-Curable Waterborne Hyperbranched Polyurethane.” J. Coat. Technol. Res., 11 (3) 319–328 (2013)
Yin, W, Zeng, X, Li, H, Hou, Y, Gao, Q, “Synthesis, Photopolymerization Kinetics, and Thermal Properties of UV-Curable Waterborne Hyperbranched Polyurethane Acrylate Dispersions.” J. Coat. Technol. Res., 8 (5) 577–584 (2011)
Yin, W, Zeng, X, Li, H, Lin, X, Ren, B, Tong, Z, “Steady Rheological Behaviors Of UV-Curable Waterborne Hyperbranched Polyurethane Acrylate Dispersions.” J. Coat. Technol. Res., 10 (1) 57–64 (2012)
Li, GN, Jiang, SL, Gao, YJ, Liu, XK, Sun, F, “Synthesis and Property of Water-Soluble Hyperbranched Photosensitive Polysiloxane Urethane Acrylate.” Ind. Eng. Chem. Res., 52 (6) 2220–2227 (2013)
Zagar, E, Zigon, M, “Characterization of a Commercial Hyperbranched Aliphatic Polyester Based on 2,2-Bis(methylol)propionic Acid.” Macromolecules, 35 (27) 9913–9925 (2002)
Karak, N, Rana, S, Cho, JW, “Synthesis and Characterization of Castor-Oil-Modified Hyperbranched Polyurethanes.” J. Appl. Polym. Sci., 112 (2) 736–743 (2009)
Eren, T, Çolak, S, Küsefoglu, SH, “Simultaneous Interpenetrating Polymer Networks Based on Bromoacrylated Castor Oil Polyurethane.” J. Appl. Polym. Sci., 100 (4) 2947–2955 (2006)
Li, K, Shen, Y, Fei, G, Wang, H, Li, J, “Preparation and Properties of Castor Oil/Pentaerythritol Triacrylate-Based UV Curable Waterborne Polyurethane Acrylate.” Prog. Org. Coat., 78 146–154 (2015)
Chen, G, Guan, X, Xu, R, Tian, J, He, M, Shen, W, Yang, J, “Synthesis and Characterization of UV-Curable Castor Oil-Based Polyfunctional Polyurethane Acrylate via Photo-Click Chemistry and Isocyanate Polyurethane Reaction.” Prog. Org. Coat., 93 11–16 (2016)
Thakur, S, Karak, N, “Castor Oil-Based Hyperbranched Polyurethanes as Advanced Surface Coating Materials.” Prog. Org. Coat., 76 (1) 157–164 (2013)
Malmstrom, E, Johansson, M, Hult, A, “Hyperbranched Aliphatic Polyesters.” Macromolecules, 28 (5) 1698–1703 (1995)
Hu, H, Yuan, Y, Shi, W, “Preparation of Waterborne Hyperbranched Polyurethane Acrylate/LDH Nanocomposite.” Prog. Org. Coat., 75 (4) 474–479 (2012)
Dzunuzovic, E, Tasic, S, Bozic, B, Jeremic, K, Dunjic, B, “Photoreactive Hyperbranched Urethane Acrylates Modified with a Branched Saturated Fatty Acid.” React. Funct. Polym., 66 (10) 1097–1105 (2006)
Mao, HY, Qiang, SY, Xu, Y, Wang, CX, “Synthesis of Polymeric Dyes Based on UV Curable Multifunctional Waterborne Polyurethane for Textile Coating.” New J. Chem., 41 (2) 619–627 (2017)
Malmstrom, E, Hult, A, “Kinetics of Formation of Hyperbranched Polyesters Based on 2,2-Bis(methylol)propionic acid.” Macromolecules, 29 (4) 1222–1228 (1996)
Hanselmann, R, Holter, D, Frey, H, “Hyperbranched Polymers Prepared via the Core-Dilution_Slow Addition.” Macromolecules, 31 3790–3801 (1998)
Bialas, N, Höcker, H, Marschner, M, Ritter, W, “13C NMR Studies on the Relative Reactivity of Isocyanate Groups of Isophorone Diisocyanate Isomers.” Macromol. Chem. Phys., 191 1843–1852 (1990)
Rochery, M, Vroman, I, Lam, TM, “Kinetic Model for the Reaction of Ipdi and Macrodiols: Study on the Relative Reactivity of Isocyanate Groups.” J. Macromol. Sci. Part A, 37 (3) 259–275 (2000)
Luo, S, Hu, X, Zhang, Y, Ling, C, Liu, X, Chen, S, “Synthesis of Thermoresponsive Unimolecular Polymeric Micelles with a Hydrophilic Hyperbranched Poly(glycidol) Core.” Polym. J., 43 (1) 41–50 (2010)
Magnusson, H, Malmstrom, E, Hult, A, “Structure Buildup in Hyperbranched Polymers From 2,2-Bis(hydroxymethyl)propionic acid.” Macromolecules, 33 (8) 3099–3104 (2000)
Hawker, CJ, Lee, R, Fréchet, JMJ, “One-Step Synthesis of Hyperbranched Dendritic Polyesters.” J. Am. Chem. Soc., 113 (12) 4583–4588 (1991)
Zhang, S, Chen, J, Han, D, Feng, Y, Shen, C, Chang, C, Song, Z, Zhao, J, “Effect of Polyether Soft Segments on Structure and Properties of Waterborne UV-Curable Polyurethane Nanocomposites.” J. Coat. Technol. Res., 12 (3) 563–569 (2015)
Jung, DH, Kim, EY, Kang, YS, Kim, BK, “High Solid and High Performance UV Cured Waterborne Polyurethanes.” Colloids Surf. A Physicochem. Eng. Asp., 370 (1–3) 58–63 (2010)
Dzunuzovic, E, Tasic, S, Bozic, B, Babic, D, Dunjic, B, “Dynamical Mechanical Analysis of Photocrosslinked Hyperbranched Urethane Acrylates.” J. Serb. Chem. Soc., 69 (6) 441–453 (2004)
Tan, J, Li, W, Wang, Z, “Preparation and Performance of Waterborne UV-Curable Polyurethane Containing Long Fluorinated Side Chains.” J. Appl. Polym. Sci., 134 (8) 44506 (2016)
Xu, H, Qiu, F, Wang, Y, Yang, D, Wu, W, Chen, Z, Zhu, J, “Preparation, Mechanical Properties of Waterborne Polyurethane and Crosslinked Polyurethane-Acrylate Composite.” J. Appl. Polym. Sci., 124 (2) 958–968 (2012)
Xu, H, Qiu, F, Wang, Y, Wu, W, Yang, D, Guo, Q, “UV-Curable Waterborne Polyurethane-Acrylate: Preparation, Characterization and Properties.” Prog. Org. Coat., 73 (1) 47–53 (2012)
Jiao, Z, Yang, Q, Wang, X, Wang, C, “UV-Curable Hyperbranched Urethane Acrylate Oligomers Modified with Different Fatty Acids.” Polym. Bull., 74 (12) 5049–5063 (2017)
Han, LJ, Dai, JY, Zhang, LS, Ma, SQ, Deng, J, Zhang, RY, Zhu, J, “Diisocyanate Free and Melt Polycondensation Preparation of Bio-Based Unsaturated Poly(ester-urethane)s and Their Properties as UV Curable Coating Materials.” RSC Adv., 4 (90) 49471–49477 (2014)
Mishra, V, Mohanty, I, Patel, MR, Patel, KI, “Development of Green Waterborne UV-Curable Castor Oil-Based Urethane Acrylate Coatings: Preparation and Property Analysis.” Int. J. Polym. Anal. Charact., 20 (6) 504–513 (2015)
Džunuzović, ES, Tasić, SV, Božić, BR, Džunuzović, JV, Dunjić, BM, Jeremić, KB, “Mechanical and Thermal Properties of UV Cured Mixtures of Linear and Hyperbranched Urethane Acrylates.” Prog. Org. Coat., 74 (1) 158–164 (2012)
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This research was supported by the Guangdong Academy of Sciences Project (Grant No. 2017GDASCX-0705).
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Wei, D., Liao, B., Yong, Q. et al. Castor oil-based waterborne hyperbranched polyurethane acrylate emulsion for UV-curable coatings with excellent chemical resistance and high hardness. J Coat Technol Res 16, 415–428 (2019). https://doi.org/10.1007/s11998-018-0120-1
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DOI: https://doi.org/10.1007/s11998-018-0120-1