• Title/Summary/Keyword: polycaprolactone as diol

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Preparation and Curing Behavior of Polyurethane Coatings by Polyester/Lactone Polyol and HDI-biuret (폴리에스테르/락톤 폴리올과 HDI-Biuret에 의한 폴리우레탄 도료의 제조 및 경화거동)

  • 최용호;김대원;황규현;박홍수;김태옥
    • Polymer(Korea)
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    • v.24 no.1
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    • pp.72-81
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    • 2000
  • Benzoic acid polyester/lactone polyol were synthesized by polycaprolactone 0201 as diol, trimethylolpropane as triol, adipic acid as dibasic acid, and benzoic acid as monobasic acid. Polyisocyanate prepolymer Desmodur N-100 of HDI-biuret type was used in this study. Two-component polyurethane coatings were prepared by blending benzoic acid polyester/polycaprolactone, polyisocyanate, wetting/dispersing agent, white pigment, and flowing agent. Various properties were examined on the film coated with the prepared polyurethane. They showed excellent physical properties such as abrasion resistance, accelerated weathering resistance, and yellowness index. They also showed good physical properties such as flexibility, impact resistance, 60$^{\circ}$ specular gloss, cross hatch adhesion, hydrocarbon resistance, and lightness index difference. Hardness of coating showed a little poor character. The introduction of polycaprolactone 0201 as diol in the polyurethane coatings improved the hydrocarbon resistance, impact resistance, and flexibility of coatings. According to the drying and curing behavior with the contents of benzoic acid, they seem to have reasonable coating properties such as drying time of 2 to 4 hours and pot-life time of 20 to 37 hours.

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Synthesis and Properties of Polyester System Polyurethane without Solvent (무용제 반응에 의한 폴리에스테르계 폴리우레탄의 합성 및 특성)

  • Kwak Noh-Seok;Yang Yun-Kyu;Jeong Boo-Young;Hwang Taek-Sung
    • Polymer(Korea)
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    • v.29 no.4
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    • pp.344-349
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    • 2005
  • Polyurethanes(PUs) were synthesized by reaction of isophorone diisocyanate, acetylbutyl citrate, and 3 types of polycaprolactone diol. Their structures were confirmed by FT-IR and NMR spectrometer. And, their thermal and mechanical properties were measured by TGA ud UTM. The effective network chain lengths ($\bar{M}_c$), measured by compressive modulus apparatus, were about $8000\~24000$ g/mol. As crosslinking density and amount of hard segment increased, tensile strength increased and elongation decreased. As the crosslinking density of PUs increased, thermal property inproved. When the ratio of NCO/OH is 1.1, maximum crosslinking density was achieved.

Synthesis and Characterization of waterborne polyurethane based on castor oil (Castor Oil 기반의 수분산 폴리우레탄의 합성 및 특성)

  • Bae, Ji-Hong;Kim, Eunyoung;Kang, Kyung Seok;Park, Duck-Jei
    • Journal of Adhesion and Interface
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    • v.18 no.4
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    • pp.179-182
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    • 2017
  • Waterborne polyurethanes(WPU) based on castor oil were successfully prepared using polycaprolactone diol(PCL), castor oil(CO) and 4,4'-methylene dicyclohexyl diisocyanate($H_{12}MDI$) as soft segment part, dimethylolbutanoic acid (DMBA) as emulsifier, and trimethylamine(TEA) as neutralizer based on different molecular weight of prepolymer. The various properties such as mechanical strength and surface reforming were evaluated using UTM, contact angle, FE-SEM based on the different molecular weight of polyol. Waterborne polyurethanes based on castor oil could be considered as a promising candidate to be applied the various adhesion fields.

Effect of polyol on urethane to increase the cavitation resistance (우레탄수지에서 캐비테이션 저항을 높이기 위한 Polyol의 영향)

  • Lee, Iksoo;Kim, Nackjoo;Pak, Daewon
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.4
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    • pp.628-634
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    • 2014
  • In this study, a new paint which is able to resist the cavitation erosion is tried to be developed by using urethane added with polyol such as poly propylene glycol(PPG), poly carbonate diol(PCD), polycaprolactone polyol (PCL-1), and poly caprolactone-tetramethylene gylcolether polyol(PCL-2). The new paint synthesized by adding polyol was characterized with physical properties and resistivity to cavitation erosion. Among polyol, the prepolymer added with PCD showed high hardness and wear resistance. However, due to too high in viscosity, the prepolymer added with PCL-1 was selected as a paint. The paint added with PCL-1 showed high resistivity to cavitation erosion and its surface was monitored by using Scanning Electron Microscope.

Preparation and Physical Properties of Polycaprolactone Diol-based Water-based Polyurethanes for Split Leather Coatings (스플릿 레더 코팅을 위한 폴리 카프로 락톤 디올 기반 수성 폴리 우레탄의 제조 및 물리적 특성)

  • Lee, Joo-Youb
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.1
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    • pp.49-55
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    • 2020
  • In this study, isophorone diisocyanate (IPDI) and dimethylolbutanoic acid (DMBA) were used on the basis of poly caprolactone diol (3M, 3.5M, 4M, 4.5M) for the synthesis of water-based polyurethanes for coating on skin layers of leather. Tensile strength, elongation, and adhesive strength of the prepared samples were measured. As a result of measuring the tensile strength, the tensile strength was found to be 4.09 kgf / ㎟ when 3 moles were applied, and 1.071 kgf / ㎟ when 4.5 moles were applied. Elongation was 366 % when 3 moles of PCL were applied, and 709 % at 4.5 moles. Adhesive strength was 2.887 kgf / cm when 3 moles of PCL was applied and 0.998 kgf / cm when 4.5 moles were applied.

Miscibility of TPU(PCL diol)/PCL Blend and its Effect on PCL Crystallinity

  • Ajili Shadi Hassan;Ebrahimi Nadereh Golshan
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.371-372
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    • 2006
  • Poly(${\varepsilon}-caprolactone$) (PCL) is a highly crystalline polymer that is miscible with several amorphous polymers including chlorinated polyether, poly(vinylchloride), poly(hydroxyether) and Bisphenol A polycarbonate. The crystallization behavior of miscible blend of amorphous/crystalline polymers has widely been studied. Generally a depression of the crystallization ability has been found with addition of amorphous component because of the reduction of chain mobility, the change of free energy of nucleation as a result of a specific interaction, and so on [1]. In this work, for the first time, the blend of PCL and copolymer of polyurethane containing polycaprolactone as a soft segment is considered. The structural similarity of TPU soft segment with PCL affects on formation of the miscible component and crystallization behavior of PCL in the blend. This has been studied using differential scanning calorimetry (DSC) and Wide-angle X-ray Scattering (WAXS).

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Synthesis of Silane Group Modified Polyurethane Acrylate and Analysis of Its UV-curing Property (실란기가 도입된 폴리우레탄 아크릴레이트 합성 및 자외선 경화 특성 분석)

  • Kim, Jung Soo
    • Journal of Adhesion and Interface
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    • v.22 no.3
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    • pp.98-105
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    • 2021
  • In this study, we prepared a silver nanoparticle transferable adhesive composition with transparency and adhesive properties using UV-curable urethane acrylate containing silane groups. The urethane-based adhesive composition was applied between the Ag/PET film in which silver nanoparticles were patterned on PET and the PC film to be transferred. Immediately after UV-curing with UV, PET was removed to complete the manufacture of Ag/PC film. UV-curable urethane acrylate containing silane groups was synthesized using polycaprolactone diol (PCL), isophrone diisocyanate (IPDI), 2-hydroxyethyl methacrylate (HEMA), and (3-aminopropyl) triethoxysilane (APTES). The silane group of APTES can improve interfacial adhesion by reacting with the specially treated silver nanoparticle surface of the Ag/PET film. In addition, we improved the adhesion between silver nanoparticle and PC film by mixing UV-curable urethane acrylate containing a silane group and a functional acrylic diluent used as a diluent. We analyzed the synthesis process of urethane acrylate using FT-IR, and compared the adhesive properties, optical properties, and transfer properties according to the molar ratio of APTES and the acrylic diluent composition. As a result, the best transfer properties were confirmed in the adhesive composition prepared under the conditions of PUA2S1_0.5.

Synthesis and Properties of Photo-curable Biomass-based Urethane Acrylate Oligomers (광경화형 바이오매스계 우레탄 아크릴레이트 올리고머의 합성 및 물성 연구)

  • Se-Jin Kim;Lan-Ji Baek;Byungjin Koo;Jungin Choi;JungMi Cheon;Jae-Hwan Chun
    • Journal of Adhesion and Interface
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    • v.24 no.1
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    • pp.26-35
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    • 2023
  • Generally, solvent-type coatings generate a large amount of volatile organic chemicals(VOC), which are carcinogenic substances, in the manufacturing process, and their use is regulated due to environmental problems. There is also the problem of resource depletion due to limited fossil fuels. Therefore, in this study, UV-curable urethane acrylate oligomers were synthesized with different contents of isosorbide, which is a biomass material, and proceeded to evaluate the physical properties of coatings. As the isosorbide contents increased, the viscosity, glass transition temperature, tensile strength, stain resistance, and pencil hardness increased, but elongation and flexibility decreased, and BOI-3 showed the best adhesion. The isosorbide content of the oligomer fixed at 20%, UV-curable urethane acrylate oligomer was synthesized according to the content ratio of polycaprolactone diol(PCL) and Ecoprol H1000(Ecoprol). As the PCL/Ecoprol content ratio increased, the glass transition temperature, elongation, and flexibility increased, but the tensile strength and pencil hardness decreased. It was confirmed that the adhesion and stain resistance increased by improving the surface bonding strength of PCL. All films of oligomers synthesized were transparent without discoloration.

A Study on the Physical Properties and Adhesion Characteristics of Polyurethane Resin (폴리우레탄 수지의 물성 및 접착특성에 관한 연구)

  • Kim, Young-Joon;Chang, Ki-Young;Kim, Gu-Ni;Chun, Yong-Chul;Yoo, Chong-Sun;Park, Sang-Wook
    • Elastomers and Composites
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    • v.31 no.2
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    • pp.104-110
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    • 1996
  • The polyurethane was synthesized by the reaction of polycaprolactone diol(Mw 2000), 4,4'-diphenylmethane diisocyanate and 1,4-butanediol as the chain extender. Also, the modified polyurethane polymers based on liquid polybutadiene as a part of soft segment and dimethylolpropionic acid as a chain extender, giving polyurethane with various polarity, were synthesized. The thermal, mechanical, adhesion properties and water contact angles of the polyurethanes were examined. From the result of the water contact angle, the polarity of the acid modified PU containing 6% acid content was unchanged but mechanical and adhesion properties were improved. The water contact angles on polybutadiene modified PU films were increased with increasing polybutadiene content. The mechanical properties of the polybutadiene modified PU were higher than that of acid modified PU. However, the mechanical properties were reduced as polybutadiene content increased. The result is presumably due to phase separation between hard segment and soft segment. The peel strength of the polyurethane introduced with 5wt% polybutadiene was improved about 150% than that of unmodified PU. The same as the mechanical properties, the more polybutadiene was introduced, the lower peel strength was obtained.

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Effect of Polyethylene Glycol Molecular Weight and NCO Index on Properties of the Hydrophilic Reactive Hotmelt Polyurethane Adhesives (Polyethylene Glycol의 분자량 및 NCO index의 변화에 따른 Hydrophilic Reactive Hotmelt Polyurethane의 물성 변화)

  • Han, Young Chul;Kim, Dack Han;Oh, Kyung Seok;Shin, Hyeon Jeong;Yang, Jeong Han;Jeong, Han Mo
    • Textile Coloration and Finishing
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    • v.30 no.2
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    • pp.90-97
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    • 2018
  • Hydrophilic reactive hot-melt polyurethane adhesive(HRHA) using a hydrophilic polyol having different molecular weight and NCO index was synthesized. This HRHA was synthesized using Polyethylene glycol(PEG) as a hydrophilic polyol, Polypropylene glycol(PPG) and Polycaprolactone diol(PCL) as hydrophobic polyols, and Methylene diphenyl diisocyanate(MDI) as an isocyanate. The changes in IR spectrum, viscosity and thermal properties of HRHA with different PEG molecular weights and NCO index were investigated, and the tensile strength and elongation of the HRHA casting film and the peel strength, moisture permeability and water pressure of the HRHA coated fabric were confirmed. In this experiment, as the molecular weight of PEG and NCO index increased, the adhesive strength, tensile strength, elongation and moisture permeability was increased but viscosity and Tg was decreased.