• Title, Summary, Keyword: hybrid emulsion

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A Study on the Curing Characteristics and the Synthesis of Polyurethane Acrylate Hybrid Emulsion (폴리우레탄 아크릴레이트 하이브리드 에멀젼의 합성 및 경화특성에 관한 연구)

  • Han, Sang-Hoon;Park, Dong-Won
    • Applied Chemistry for Engineering
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    • v.17 no.2
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    • pp.132-137
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    • 2006
  • Polyurethane acrylate hybrid emulsions were prepared by seeded polymerization techniques. In the synthesis, seeded polyurethane dispersion containing a carboxylic group was used to endow hydrophilicity to the hybrid emulsion and various acrylates such as methyl methacrylate (MMA), 2-hydroxy ethylmethacrylate (2-HEMA), n-butyl acrylate (n-BA) and acrylic acid (AAc) were used to endow hydrophobicity. The particle size and distribution of various emulsion particles such as polyurethane acrylate hybrid emulsion, polyurethane dispersion homopolymer, acrylate emulsion, and physical blending emulsion were measured by a particle size analyzer. The average particle size of hybrid emulsion was greater than physical blending emulsion. And tensile strength, 100% modulus, elongation, and swelling properties of the polyurethane acrylate hybrid emulsion were studied and compared with those of polyurethane homopolymer, acrylate emulsion, and physically blended compositor, respectively. To improve chemical and physical resistance, this paper review a melamine hardener and compares it for effects on the physical properties of cured coating.

Synthesis and Characterization of Poly(urethane-ethyl acrylate) Hybrid Emulsion (폴리(우레탄-에틸 아크릴레이트) 혼성 에멀젼의 합성과 물성 비교 연구)

  • Cheong, In Woo;Lee, Jong Kil;Kim, Jung Hyun
    • Applied Chemistry for Engineering
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    • v.16 no.1
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    • pp.86-92
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    • 2005
  • Poly(urethaneethyl acrylate) hybrid emulsions were synthesized to improve their thermomechanical and solvent resistance properties. In the synthesis, dimethylol propionic acid was used to impart hydrophilicity to the hybrid polymers, and ethyl acrylate monomer was added to the polyurethane prepolymer after neutralization with triethylamine. After dispersion of the neutralized prepolymer, chain extension was carried out with ethylene diamine. Consequently, poly(urethaneethyl acrylate) hybrid emulsion was prepared via soap free emulsion polymerization of ethyl acrylate with reduction-oxidation initiator couple of t-butyl hydroperoxide/sodium bisulfite at $50^{\circ}C$. Tehsile strength, 100% modulus, elongation, and solvent-resistance properties of the hybrid emulsion were measured and compared with those of polyurethane homopolymer, poly(ethyl acrylate) homopolymer, and simple blended samples.

Analysis of Hybrid Emulsion Surfaces by the Phase Lag Mapping Atomic Force Microscopy (위상지연 원자간력 현미경법에 의한 혼성 에멀젼 표면의 분석)

  • Han, Sang-Hoon;Kim, Jong-Min;Park, Dong-Won
    • Applied Chemistry for Engineering
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    • v.17 no.4
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    • pp.381-385
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    • 2006
  • We applied a new analyzing technique for the polyurethane acrylate hybrid emulsion sample composed of polyurethane resin and acrylate resin using the phase-lag mapping techniques of atomic force microscopy. For the analysis, we synthesized similarly sized pure polyurethane dispersion and acrylate emulsion particles, which were used for measuring the standard phase-lag intensities for each material. Based on these signal intensity, we could discriminate acryl particle in the polyurethane dispersion matrix with the resolution of a few tens of nanometers. Thus, the techniques show a new possibility in the analysis of the organic two-phase particles, and we believe the techniques are helpful to design organic particles.

Synthesis and Characterization of Poly(Urethane-Methyl methacrylate) Hybrid Emulsion as a Plastic Coating Resin (플라스틱 코팅용 Poly(Urethane-MMA) 혼성 에멀젼 합성 및 특성 연구)

  • Yeom, Ji-Yoon;Baek, Kyung-Hyun;Lee, Jun-Young;Yi, Gyoung-Bae;Yoo, Byung-Won;Kim, Jung-Hyun
    • Journal of Adhesion and Interface
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    • v.8 no.1
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    • pp.8-14
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    • 2007
  • Poly(urethane-methyl methacrylate) hybrid emulsions can be controlled with their thermal, mechanical and anti-chemical properties as plastic coating materials. In this study, water dispersed poly(urethane-methyl methacrylate) hybrid emulsions were prepared by prepolymer synthesis and soap free emulsion polymerization. For imparting hydrophilicity on polyurethane prepolymer, 2,2-bis (hydroxymethyl) propionic acid was added to the polyurethane prepolymer with methyl methacrylate monomer and was neutralizated by triethylamine (TEA). After neutralization, the prepolymer mixture was dispersed in the water phase with stable droplets. The synthesis was carried out with chain extension from the ethylene diamine and initiation of methyl methacrylate by soap free emulsion polymerization. Stable poly(urethane-methyl methacrylate) hybrid emulsion was successfully obtained with different synthetic conditions and acrylic monomer contents. Poly(urethane-methyl methacrylate) hybrid emulsion were characterized and compared with tensile strength, viscosity, and adhesion properties.

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Improvement of Emulsion Stability of Food Proteins by Microbial Transglutaminase (미생물유래 transglutaminase를 이용한 식품단백질의 유화안정성 향상에 관한 연구)

  • Lee, Deuk-Sik
    • Korean Journal of Food Science and Technology
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    • v.37 no.2
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    • pp.164-170
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    • 2005
  • To improve functional properties of food proteins, homologous or heterologous ${\beta}-casein$ and 11S globulin(glycinin) from animal and vegetable proteins, respectively, were bio-hybridized using transglutaminase(MTGase). Susceptibility was confirmed by SDS-PAGE, particle size analyzed, and emulsion stability tested using Reddy and Fogler method, To determine how bio-hybridized protein influences emulsion stability, protein bound on oil droplet was investigated using Scanning Electron Microscopy (SEM). formation of bio-hybridized protein band was detected among homologous and heterologous proteins, with heterologous protein forming weak band in oligomer form. Homologous ${\beta}-casein$ protein showed high emulsion stability, while homologous glycinin showed almost no stability. Stability of heterologous ${\beta}-casein$ and glycinin protein was higher than that of glycinin. SEM photographs showed even distribution of bio-hybridized proteins on oil droplet improved stability.

Synthesis, interfacial property, and application of new hybrid anion surfactant containing fluorocarbon and hydrocarbon chains

  • Kang, Eun-kyung;Sohn, Eun-Ho;Jung, Ga Young;Jung, Seon Hwa;Ha, Jong-Wook;Lee, Soo-Bok;Park, In Jun;Lee, Byung Min
    • Journal of Industrial and Engineering Chemistry
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    • v.67
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    • pp.72-79
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    • 2018
  • Hybrid F2HX surfactants bearing a sulfate moiety and both hydrocarbon and fluorocarbon chains were prepared by the reaction of alkyl glycidyl ethers with fluoro-alcohol, and subsequent sulfation. The fluorocarbon number in F2HX was fixed at the shortest number possible (i.e., 2), while the hydrocarbon number (X) in the second chain was varied between 2, 4, 6, and 8. Their surface-active properties and emulsion stabilities were systematically estimated as a function of the X. Among them, F2H8 exhibited the optimal surfactant performance, which was comparable to previously reported surfactants and it was successfully applied in the emulsion polymerization of vinylidene fluoride.

Study on Properties of Waterborne Polyurethane-Epoxy Hybrid Resin for Leather Garment Coationgs (의상 피혁 가공용 수용성 폴리우레탄-에폭시 하이브리드 수지의 합성 및 물성에 관한 연구)

  • Lee, Joo-Youb;Kim, Ki-Jun
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.3
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    • pp.325-336
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    • 2010
  • In this study, we experimented that how to synthesis waterborne urethane-epoxy hybrid resin for leather garment coatings. First of all, We had analyzed datas by FT-IR, SEM and TGA for the machanical properties. By instruments analysis measurement we confirmed that synthesis of urethane and epoxy. In this experiment we knew that polyurethane and urethane-epoxy hybrid resin have 4~5 grades of solvent resistance. Tensile strength measured in the urethane-epoxy resin(epoxy 12%, 2.033$kg_f/mm^2$) had the most strong strength than polyurethane(1.833 $kg_f/mm^2$) emulsion samples. Also urethane-epoxy hybrid resin had better result than polyurethane in acid resistance and abrasion test. As hight proportion of epoxy in hybid resin, we obtained low elongation and low flexibility. In this result, the mechanical properties of waterborne polyurethane-epoxy hybrid resin showed that how effect in leather coating by ratio of epoxy emulsion.

Study on Mechanical Properties of Waterborne Polyurethane-Acrylic Hybrid Resin for Leather Coationgs (피혁가공용 수용성 아크릴-폴리우레탄 Hybrid Resin의 합성 및 기계적 특성에 관한 연구)

  • Lee, Joo-Youb;Kim, Ki-Jun
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.2
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    • pp.188-195
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    • 2010
  • In this study, we experimented that how to synthesis waterborne urethane-acrylic hybrid resin for leather coatings. First of all, We had analyzed data by FT-IR, SEM and TGA for the machanical properties. By TGA analysis polymers showed heat distortion temperature. and by FT-IR measurement we confirmed that synthesis of urethane and acrylic. In the experiment, solvent resistance, polyurethane and acrylic grades 4-5 showed both a high. Tensile strength measured in the waterborne polyurethane > Acrylic emulsion showed strength in the order. Films were obtained by coating the water born resin on leveled surfaces and allowing them to dry at room temperature for 72hrs. After demolding, the films were kept in a desiccator to avoid moisture contant at $25^{\circ}C$ for 45hrs before the measurements. In this result, the mechanical propersies of waterborne polyurethane-acrylic hybrid resin showed that how effect to resin in leather coating between polyurethane content and acrylic content. Therefore, acrylic emulsion had most high solvent resistance glade and waterborne polyurethane had good result in abrasion test and tensile strength.

Synthesis of Polyurethane-polyacrylate Hybrid Emulsions (폴리우레탄-폴리아크릴레이트 하이브리드 에멀젼의 제조)

  • Kang, Sang Yong;Kim, Hyung Joong
    • Journal of Adhesion and Interface
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    • v.9 no.1
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    • pp.16-21
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    • 2008
  • Hybrid emulsions consisting of polyurethane and acrylic polymer were prepared by emulsion polymerization of acrylic monomers and polyurethane water dispersions (PUD) as an emulsifier. At first, cationic type of PUD was synthesized with IPDI, PTMG1000, MDEA, and acetic acid. Then, acrylic monomers, such as MMA and n-BA, were copolymerized with the PUD without adding further surfactant. The tensile properties and water resistance increased with increasing acrylic monomer ratio. The hybrid emulsions showed better properties than the emulsions simply blended with the PUD and the acrylic emulsions.

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Burner combustion characteristics of hybrid type water mixing emulsion fuel (하이브리드형 물혼합 에멀젼 연료의 버너 특성)

  • Kim, Cheol-Jeong;Kim, Dong-Kwon;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.4
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    • pp.308-315
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    • 2013
  • Water emulsion technology has the problem of unstable combustion due to the rapid separation of water. To solve the problem, a hybrid mixing device was developed. The device attached on the burner was tested. As a result, the fuel consumption reduced to 12% in the similar condition of exhaust emissions and flame temperature, and 45.5%, 98.5% and 97.2% of NOx, CO, and smoke were reduced at the same inlet air and fuel flow rate.