• Title/Summary/Keyword: 불포화폴리에스터

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Preparation and Characteristic of Sheet Molding Compound using Unsaturated Polyester Resin with Low Profile Agent of Polystyrene (저수축제 폴리스틸렌과 불포화 폴리에스터 수지를 사용한 Sheet Molding Compound 제조 및 특성)

  • Bae, Gi Boong;Lee, Sang Goo;Yoon, Hong Jin;Lee, Jong Dae
    • Korean Chemical Engineering Research
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    • v.50 no.3
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    • pp.588-593
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    • 2012
  • Compatibility of unsaturated polyester (UP) and low profile agent (LPA) of polystyrene (PS) have been investigated under various mixing conditions such as the ratio of UP and LPA, mixing time, mixing temperature, and input amount of 2nd UP. It was possible to obtain mixture with small particle size and low phase separation in condition of 35 g of LPA, 25 g of 1st UP input, 5 min of mixing time, 1700 rpm of mixing speed, and 45 g of 2nd UP input. It was found that compatibility of UP and LPA was very sensitive to mixing conditions. In addition, molded sample using sheet molding compound prepared by stable mixing condition appeared good properties such as low water adsorption, low shrinkage, and high gloss.

Flammability Characteristics of Unsaturated Polyesters for FRP (FRP용 불포화폴리에스터 수지들의 연소 특성 연구)

  • 최원종
    • Fire Science and Engineering
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    • v.12 no.4
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    • pp.51-57
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    • 1998
  • The thermal behavior and the flammability characteristics of four different unsaturated polyester resins were studied by performing a series of thermal analysis experiments and laboratory scale fire tests. The results of TGA and DSC reveals that the vinylester type resins have superior thermal performances when compared to the isophthalic type resins. The vinylester type resins formed a network shaped char surface after the thermal decomposition up to 55$0^{\circ}C$. Consequently, the vinylester type resings have shown lower value of burning rate than that of iso type resins. Due to the high level of flammability and toxic smoke emission, the appropriate flame retardant system should be applied to the unsaturated polyester resings.

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An Experimental Study on Permeability in Elevation of Porous Concrete Using Unsaturated Polyester Resin (불포화 폴리에스터수지를 이용한 투수 콘크리트의 투수성 향상에 관한 실험적 연구)

  • Lho, Byeong-Cheol;Choi, Kyu-Hyung;Kim, Jeong-Hoon
    • Journal of the Korea Concrete Institute
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    • v.19 no.2
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    • pp.163-169
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    • 2007
  • This study is focused on the proper mixture design of materials for the porous concrete with unsaturated polyester resin. The materials used in the mixture include the single-grade aggregates, unsaturated polyester resin as binder, and calcium carbonate as a filler. An experimental procedure has been carried out to select the best combination of the materials that satisfy both the required permeability and compressive strength. Various kinds of gravel size, the ratio of binder, and F/B ratios are tried to get proper mixture, and the permeability coefficient and compressive strength have been measured to find out the best combination of materials based on the proper Korean Standards. A promix design satisfied the standards of rainfall runoff reduction system with $3.5{\times}10^{-1}$ (cm/sec) of permeability, 34 % of porosity, 11 MPa of compressive strength can be obtained.

Moisture Absorption Behavior of CNT Reinforced Unsaturated Polyester Composites (CNT 강화 불포화 폴리에스터 복합재료의 수분흡수 거동에 관한 연구)

  • Park, Ji-Hye;Yoon, Sung-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.536-538
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    • 2011
  • In this study, the moisture absorption behaviors of the CNT reinforced unsaturated polyester composites were investigated along with exposure temperature and time. The tensile properties of the specimens were evaluated to identify the effect of absorbed moisture on the mechanical properties. The exposure temperatures of $25^{\circ}C$ and $75^{\circ}C$ were considered and the exposure time up to 600 hours was applied. According to the results, moisture absorption rate was increased as CNT content and exposure temperature were increased. The rate of decrease in tensile strength of the CNT reinforced unsaturated polyester composites was reduced due to the reinforcing effect of CNT compared to the unsaturated polyester resin.

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A Study on the Effects of Flame Retardants in Unsaturated Isophthalic Acid Polyester Resin (불포화 이소프탈산 폴리에스터 수지의 난연제 첨가 효과 연구)

  • 최원종
    • Fire Science and Engineering
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    • v.12 no.4
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    • pp.41-49
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    • 1998
  • In this study, the thermal improvement of an isophthalic acid polyester resin by the incorporation of flame retardants has been investigated. Aluminium hydroxide, antimony oxide and alumina powder were used to formulate the flame retardant systems. The improvement of an isophthalic resin by incorporating aluminium hydroxide is dramatic(burning rate and smoke emission are reduced), although the mechanical property is decreased significantly. The addition of small amount(2.5 phr) of antimony oxide produces high char yield(31%) which acts as a protective layer on the surface of the resin.

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High Temperature Cure Behavior of Unsaturated Polyester Resin (불포화 폴리에스터 수치의 고온경화특성 연구)

  • 김형근;오제훈;이대길
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.11a
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    • pp.38-41
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    • 2000
  • High temperature cure characteristics of polyester resin systems were investigated by isothermal and dynamic differential scanning calorimetries. During isothermal scanning, the experimental procedure was modified to reduce the initial Boss of heat. no kinetic equation from the isothermal experiment was compared with that from the dynamic experiment.

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Effect of Organic Modifiers and Mixing Times on the Properties of Unsaturated Polyester/Montmorillonite Nanocomposite (유기 개질제의 종류와 혼합 시간에 따른 불포화 폴리에스터/ 몬모릴로나이트 나노복합체의 제조 및 특성)

  • 김호겸;이동호;서관호;김우식;박수영;민경은
    • Polymer(Korea)
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    • v.27 no.6
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    • pp.589-595
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    • 2003
  • Unsaturated polyester (UP) nanocomposite with montmorillonite (MMT) which contains different types of organic modifiers far nano-filler have been prepared to investigate the effect of chemical structure of organic modifiers and mixing time of all components on properties of products. It was found that the morphology and various physical properties of UP/MMT nanocomposites were influenced by properties of organic modifiers of MMTs. It was also confirmed that the content of MMT does not significantly affect properties of UP/MMT nanocomposites.

Influence of Sizing Agent on Interfacial Adhesion and Mechanical Properties of Glass Fiber/Unsaturated Polyester Composites (사이징제에 따른 유리섬유/불포화 폴리에스터 복합재료의 계면 접착력과 기계적 물성)

  • 박수진;김택진;이재락;홍성권;김영근
    • Polymer(Korea)
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    • v.24 no.3
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    • pp.326-332
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    • 2000
  • The effects of sizing agent on the final mechanical properties of the glass fiber/unsaturated polyester composites were investigated by contact angle measurements at room temperature. In this work, glass fibers were coated by poly(vinyl alcohol), polyester, and epoxy type sizing agent and each property was compared. Contact angles of the sized glass fiber were measured by the wicking method based on Washburn equation using deionized water and diiodomethane as testing liquids. As an experimental result, the surface free energy calculated from contact angle showed the highest value in case of the glass fiber coated by epoxy sizing agent. From measurements of interlaminar shear strength (ILSS) and fracture toughness ( $K_{IC}$ ) of the composites, it was found that the sizing treatment on fibers could improve the fiber/matrix interfacial adhesion, resulting in growing the final mechanical properties. This was due to the enhanced surface free energy of glass fibers in a composite system.

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Hardening properties in MMA monomer using UP and EPS in addition hardener (경화제의 첨가에 따른 UP와 EPS 혼입 MMA 수지의 경화특성)

  • Lee, Jung-Hui;Song, Hun;Chu, Yong-Sik;Lee, Jong-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.445-448
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    • 2008
  • The unsaturated polyester(UP) and epoxy resin have a superior material properties and a chemical resistance using sewerage pipes rehabilitation. However, UP and epoxy have not a low temperatures harding, the requirement $8{\sim}11$ hours long times harding and heating system used by reinforcement liner. This study is to evaluate the effects of low temperature harding properties methyl methacrylate(MMA) monomer using expanded polystyrene(EPS) and UP in addition of initiator and promoters. From the test result, viscosity tends to increase with increasing EPS and UP contents. However, harding time change of the MMA resins which it follows in addition of the initiator and promoter.

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