• Title/Summary/Keyword: UV-curable polyurethane acrylates

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Syntheses and Characterization of UV-curable Polyurethane Acrylates with Eco-friendly Polyols (친환경 폴리올을 이용한 광경화형 폴리우레탄 아크릴레이트의 합성)

  • Lee, Bong;Kim, Yeong Woo;Lee, Won-Ki
    • Journal of Adhesion and Interface
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    • v.20 no.4
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    • pp.140-145
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    • 2019
  • In view of environmental considerations, the control of carbon dioxide (CO2) and volatile organic compounds (VOCs) is one of important issues in the film and coating industries. Therefore, UV-curable system has been developed due to minimize emissions of VOCs and reduce CO2 emission due to low energy consumption from fast curing. Also, biodegradable polymers economically are attractive because of environmental and economic concerns associated with huge waste plastics. In this study, UV-curable polyurethane acrylates with different compositions of biodegradable polylactide (PLA) diol and poly(ethylene glycol) as diols were synthesized and curing reaction of their end-capped acrylates was performed by UV exposure. Tensile strength, elongation, and Tg of the UV-cured polyurethane acrylates increased with PLA diol content in the diol while their hydrophilicity and thermal stability increased with the PEG content. These results indicated a property of UV-cured polyurethane acrylates could be controlled by environment-friendly diols.

Preparation and Properties of UV-Curable Polyurethane Acrylates(I) -Effect of Molecular Weights of Polyol and Diol with Low Molecular Weight into Polymer Chain- (UV-경화 폴리우레탄 아크릴레이트의 제조와 특성(I) -폴리올의 분자량과 저분자량 디올의 도입의 영향-)

  • 최준영;이동진;김한도
    • Textile Coloration and Finishing
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    • v.11 no.4
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    • pp.1-7
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    • 1999
  • Urethane-acrylate propelymers for secondary coating of optical fiber and high - performance material were prepared from the 4,4'-diphenylmethane diisocyanate(MDI), poly(tetramethylene oxide)glycol(PTMG, Mw 650 or 1000), 1,6-hexanediol(HD), 2-hydroxyethyl acrylate(HEA), and dibutyltin dilaurate as a catalyst. UV-Curable polyurethane acrylates were formulated from the urethane-acrylate prepolymers, three types of reactive diluents(DTs) having mono-, di-, and trifunctional-phenoxyethyl acrylate(PEA), hexanediol diacrylate(HDDA), and trimethylolpropane triacrylate(TMPTA), and 1-hydtoxycyclohexyl phenyl ketone(Irgacure 184) as a photoinitiator. The UV-cured films of polyurethane acrylates were obtained by curing using a medium-pressure mercury lamp(U W/cm, $\lambda_{max}=365\;nm)$. In this work, the effects of molecular weights of polyol and diol with low molecular weight into polymer chain on mechanical and dynamic mechanical properties of UV-cured polyurethane acrylates were studied. The structure and properties of the films obtained from the UV photopolymerization of urethane-acrylate prepolymer were investigated by FT-IR spectroscopy, dynamic mechanical measurement, tensile testing, and X-ray diffractometry.

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UV-Curable Fluorinated Crosslinkable Polyurethane-Acrylates for Marine Antifouling Coatings

  • Park, Jin-Myung;Kim, Sung Yeol;An, Seung-Kook;Lee, Young-Hee;Kim, Han-Do
    • Clean Technology
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    • v.23 no.2
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    • pp.148-157
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    • 2017
  • To prepare UV-curable polyurethane-acrylate oligomer, NCO-terminated urethane prepolymers with trimethylolpropane, [TMP; 0 (0), 0.1 (0.021) and 0.2 (0.043) mole (mole fraction)] as crosslinkable tri-functional chain extender were end-capped with pentaerythritol triacrylate [PETA; 2.0 (0.400), 1.7 (0.354) and 1.4 (0.304) mole (mole fraction)] with one hydroxyl group/three vinyl functionalities. The stable as-formulated UV-curable polyurethane-acrylates [stable mixtures of PETA-capped oligomer/reactive acrylic monomer diluents without/with heptadecafluorodecyl methacrylate (PFA; 0, 6 and 9 wt%)] were formed up to 0.2 (0.043) mole (mole fraction) of TMP content in the prepolymer, while homogeneous-mixing failed at 0.3 (0.068) mole (mole fraction), in which the crosslink density in NCO-terminated urethane prepolymer was too high to enable the formation of stable mixture. This study examined the effect of TMP/PETA molar ratio and heptadecafluorodecyl methacrylate (PFA) content (wt%) on the properties of UV-cured polyurethane-acrylates as marine antifouling coating materials. The properties of UV-cured polyurethane-acrylate were found to be significantly dependent on the crosslinkable TMP/PETA ratio and PFA content. With the increasing of the TMP and PFA contents, the contact angles increased, and consequently the surface tension decreased. The adhesion of algae/barnacles to PFA contained film samples were found to be sufficiently weak to allow their easy removal. These results suggest that the UV-cured samples containing PFA have strong potential as coating materials for antifouling applications.

Synthesis and Characterization of UV-curable Polyurethane Acrylates Coating Resins for PVC Tiles (PVC 바닥상재용 광경화형 폴리우레탄 아크릴 수지의 합성 및 특성고찰)

  • Zhao, Hong;Ha, Jin-Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.5
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    • pp.1773-1777
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    • 2010
  • The Application of UV curing technique for poly (vinyl chloride) (PVC) floor tiles coating has improved the quality of PVC floor. Several formulations were made including acrylated oligomers based on a polyurethane were blended with reactive monomers, photoinitiators and other additives. The used oligomers are commercial aliphatic urethane acrylates. Thin films were prepared on PVC tiles by bar coating with different formulations using UV radiation. The coating resins were characterized by FTIR. The properties of UV-cured films such as gloss and adhesion were examined. The properties of UV-cured films dependent on the influence of composition and processing conditions was studied.

Effect of Chemical Structure on the Properties of UV-cured Polyurethane Acrylates Films

  • Kwon, Ji-Yun;Yoo, Hye-Jin;Kim, Han-Do
    • Fibers and Polymers
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    • v.2 no.3
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    • pp.141-147
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    • 2001
  • The effect of compositions of isophorone diisocyanate (IPDl)/4.4'-diphenylmethane diisocyalate (MDI) and polypropylene oxide diol (PPG, $M_w$: 3000)/1,4-butane diol (BD) on the properties of UV-cured polyurethane acrylate films based on 2-hydroxyethyl acrylate (HEA) was examined. UV-curable polyurethane acrylates were formulated from the prepolymer. trimethylol propane triacrylate (TMPTA) as a reactive diluent, and 1-hydroxycyclohexyl ketone (Irgacure 184) as a photoinitiator. Dynamic mechanical thermal properties and elastic properties of UV-cured polyurethane acrylates was fecund to depend on the chemical composition of IPDl/MDl and PPG/BD. As the BD content increased, the tensile storage modulus of all series samples increased significantly. The storage modulus increased in the order of samples A (IPDI based samples)> samples B (IPDI/MDl (7/3 molar ratio) based samples) > samples C (IPDI/MDl (5/5 molar ratio) based samples at the same composition. Two distinct louts modulus peaks for all samples are observed owing to the softs segment glass transition temperature ($T_gh$) and hard segment glass transition temperature ($T_gh$). The difference between $T_gh$, and $T_gh$, (Δ$T_g$) increases in the order of A > B > C at the same composition. In cycle test, the initial onset strain (%) was found to decrease with increasing BD content in PPG/BD and with increasing MDI content in IPDI/MDl.

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Synthesis and Charcterization of UV-curable Polyurethane Acrylates Coating Composition for PVC Tiles (PVC 바닥상재용 광경화형 폴리우레탄 아크릴 수지의 합성 및 특성고찰)

  • Zhao, Hong;Ha, Jin-Wook
    • Proceedings of the KAIS Fall Conference
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    • 2009.12a
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    • pp.80-83
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    • 2009
  • Application of UV curing technique for poly vinyl chloride (PVC) floor tiles coating has improved the quality of PVC floor. Various formulations including acrylated oligomers based on a polyurethane were blended with reactive monomers, photoinitiators and other additives. The used oligomers are commercial aliphatic urethane acrylates. Thin films were prepared on PVC tiles by bar coating with different formulations using UV radiation. The coating resins were characterized by FTIR. The properties of UV-cured films such as gloss grade and adhesion were examined. The properties of UV-cured films dependent on the influence of composition and processing conditions was studied. The investigation was conducted to achieve an optimal domain of composition and desired coating effect.

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Comparision of the Properties of UV-cured Polyurethane Acrylates Containing Different Diisocyanates and Low Molecular Weight Diols

  • Yoo, Hye-Jin;Lee, Young-Hee;Kwon, Ji-Yun;Kim, Han-Do
    • Fibers and Polymers
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    • v.2 no.3
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    • pp.122-128
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    • 2001
  • UV-curable polyurethane acrylate prepolymers were prepared from diisocyanates [isophorone diisocyanate (IPDI), 2,4-toluene diisocyanate (TDI), or 4,4'-dicyclohexylmethane diisocyanate (H$_{12}$MDI)], diols [ethylene glycol (EG), 1,4-butane diol (BD), or 1,6-hexane diol (HD)], polypropylene glycol as a polyol. UY-curable mixtures were formulated from the prepolymer (90 wt%), reactive diluent monomer trimethylol propane triacrylate (10 wt%). and photoinitiator 1-hydroxycy-clohexyl ketone (3 wt% based on prepolymer/diluent). The effects of different diisocyanates/low molecular weigh dial on the dynamic mechanical thermal properties and elastic recovery of UV-cured polyurethane acrylate films were examined. The tensile storage modulus increased a little in the order of EG > BD > HD at the same diisocyanate. Two loss modulus peaks for all samples are observed owing to the glads transition of softs segments ($T_gh$) and the glass transition temperature of hard segments ($T_gh$). For the same diisocyanate, $T_gh$, decreased, however, $T_gh$ increased, in the order of HD > BD > EG. The elastic recovery also increased in the order of HD > BD > EG at the same diisocyanate. In case of same diols, $T_gh$ increased in the order of $H_12$MDl > TDI > IPDI significantly. The ultimate elongation and elastic recovery increased in the order of TDI > IPDI > $H_12$MDl at the same diol.l.

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Study on the Properties of UV-curable Polyurethane acrylate with reactive diluents content (자외선 경화형 폴리우레탄 아크릴레이트 수지의 반응성 희석제 함량에 따른 물성 연구)

  • Sim, Jae Hak;Seo, Eun Sun;Lee, Won Young;Kim, Gu Ni
    • Journal of Adhesion and Interface
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    • v.18 no.4
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    • pp.159-165
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    • 2017
  • In this study, we synthesized UV-curable urethane acrylates with different contents of BA, reactive diluent and characterized their physical properties such as thermal, mechanical properties, adhesive strength and flexibility resistance. From a result of DSC, Tg of polyol and acrylate resin were separated as the BA content increased more than 40%. Also, tensile strength, elongation and adhesive strength decreased with increasing the BA content. The UV-curable urethane acrylate with 40% BA has shown good flexibility resistance compared to other resin due to poor hardness and Tm of acrylate resin.

Synthesis of UV Curable Polyurethane Adhesives Based on Various Compositions of Mixed Polyol with Improved Adhesion and Flexural Properties (다양한 조성의 혼용 폴리올에 기초한 접착력 및 굴곡성이 향상된 자외선 경화형 폴리우레탄 접착제의 합성)

  • Won-Young Lee;Soo-Yong Park;Guni Kim;Ildoo Chung
    • Journal of Adhesion and Interface
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    • v.23 no.4
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    • pp.137-143
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    • 2022
  • In this study, the polyurethane acrylates (PUA) resin with good adhesive and flexibility for adhesive for shoes and clothing were synthesized using that poly(tetramethylene adiphate glycol) (PTAd), poly(tetramethylene ether glycol) (PTMG) as polyester polyol and polyether polyol respectively, including 4,4'-methylene diphenyl diisocyanate (MDI), isophorone diisocyanate (IPDI), 1,4-butandiol (1,4-BD), 2-hydroxyethyl methacrylate (2-HEMA) and dibutyl amine (DBA). The effect of polyol blend in the polyurethane acrylate on thermal and mechanical properties, adhesion strength and flexural strength were studied. The glass transition temperature (Tg) of PUA was confirmed in range of -70~-40 ℃. In addition, the glass transition temperature (Tg), decomposition temperature (Td), tensile strength adhesion strength and heat resistance were increased as increasing of PTAd amount while the elongation, water resistance and flexural properties were decreased. The synthesized polyurethane acrylate with 5:5 ratio of PTAd and PTMG indicated the highest adhesion strength and flexural properties.