• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2000년도 추계학술발표대회 논문집
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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.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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• pp.1115-1120
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• 2000

The purpose of this study is to investigate toughening of unsaturated polyester resin by addition of liquid rubber. In general, unsaturated polyester liquid has strong brittleness in spite of if high strength Therefore; it is difficult use polyurethane liquid rubber for the place where impact resistance is demanded. In this study, it was evaluated strength, impact resistance and fracture toughness by adding to polyurethane liquid rubber(0~25%). As a result, it was found that a tendency to be increase bearing impact and fracture toughness as polyurethane liquid rubber increased but strength was decreased.

• Korean Chemical Engineering Research
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• 제50권3호
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• pp.588-593
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• 2012

불포화 폴리에스터(unsaturated polyester, UP)와 저수축제(low profile agent, LPA), 폴리스틸렌(polystyrene, PS)과의 compatibility가 불포화 폴리에스터와 저수축제의 비율, 혼합시간, 혼합온도 그리고 추가로 투입되는 불포화 폴리에스터 수지량과 같은 다양한 조건하에서 확인되었다. 1단계로 1700 rpm의 교반속도에서 제조된 수지 혼합액의 경우, 불포화 폴리에스터 수지(unsaturated polyester resin, UPR) 투입량 25 g, 약 $30^{\circ}C$의 반응온도에서 상대적으로 작은 입자 크기 및 상분리율을 나타내었다. 2단계 수지 혼합액의 경우, 2차로 투입된 45 g의 불포화 폴리에스터 수지 혼합액에서 향상된 compatibility를 보였다. 이러한 결과는 혼합조건이 불포화 폴리에스터 수지와 저수축제 혼합액의 compatibility에 중요한 역할을 한다는 것을 의미한다. 또한, 상기조건을 통해 제조된 sheet molding compound (SMC)를 사용해서 만든 샘플은 흡수율, 수축율 및 광택도에서 향상된 결과를 나타내었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.741-744
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• 2006

The study focuses on the mixture of materials for the development of porous concrete with unsaturated polyester resin. The materials used in the mixture include the coarse aggregates unsaturated polyester resin as binder, calcium carbonate and sand 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.

• 한국농공학회논문집
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• 제58권1호
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• pp.19-26
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• 2016

This study was performed to evaluate the strength and durability properties of modified epoxy composites with waste tire chip, recycled coarse aggregate, filler and modified epoxy to improve elongation and elasticity of epoxy. Additionally, for comparing to modified epoxy and unsaturated polyester resin as a binder, unsaturated polyester resin composites were developed in the same condition. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate size and binder content. Tests for the compressive and flexural strength, freezing and thawing and durability for 20 % sulfuric solution were performed. The compressive and flexural strength of modified epoxy composites were in the range of 34.9~61.6 MPa and 10.2~18.3 MPa at the curing 7 days, respectively. Also, the compressive and flexural strength of unsaturated polyester resin composites were in the range of 44.2~77.8 MPa and 11.3~20.8 MPa at the curing 7 days, respectively. After 300 cycles of freezing and thawing, weight decrease ratio and durability factor of modified epoxy composites were in the range of 0.8~1.9 % and 95~98, respectively. Accordingly, modified epoxy composites will greatly improve the durability of concrete.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1992년도 봄 학술발표회 논문집
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• pp.35-40
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• 1992

Results of an experimental study on the manufacture, the workability and mechanical properties of steel fiber reinforced polyester resin composites utilizing industrial waste products are presented in this paper. The fly ash polyester resin composites using steel fiber, fly ash and calcium carbonic acid (CaCo3), unsaturated polyester resin, styrene monomer, cobalt octate and methyl ethyl ketone peroxide, fine and coarse aggregates are prepared with various filler~binder rations, binder rates and mixing conditions. As a test results, the workability of steel fiber reinforced polyester resin composites are considerably dropped with increasing fly ash-binder ratio and steel fiber volume. And compressive, flexural strength and bending toughness of the composites are remarkably improved with augmenting fiber contents.

• 콘크리트학회논문집
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• 제19권2호
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• pp.163-169
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• 2007

본 연구에서는 불포화 폴리에스터수지를 이용하여 적절한 투수성과 압축강도 및 내구성을 갖는 투수 콘크리트를 개발하고자 하였다. 투수 콘크리트 개발을 위해 사용된 재료로는 단입도 굵은골재와 결합재로서 불포화 폴리에스터수지 그리고 채움재로서 탄산칼슘을 이용하였다. 배합 방법은 굵은골재 최대치수, 결합재 비율, F/B 비율 등을 변화시키며 KS 규격에 준하여 각각의 배합에 따른 투수계수, 압축강도를 평가하였다. 그 결과, 투수계수는 약 $3.5{\times}10^{-1}cm/sec$, 공극률은 약 34%, 압축강도는 11 MPa로 나타나, 우수유출저감시설의 기준을 만족하는 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.769-774
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• 2002

In this study, methyl methacrylate (MMA)- modified polyester polymer concrete, in which the MMA was added to the unsaturated polyester resin, was developed for improving the early-age strength and the workability of the conventional polymer concrete, binder of which was the unsaturated polyester resin. Then the fundamental properties of the polymer concrete such as workability and strength were surveyed. The experimental results showed that the workability was remarkably improved as the MMA contents increased, and the filler-binder ratio was turned out to be important factor for the workability. Slump prediction equation was derived by the regression analysis based on MMA content and filler-binder ratio. Furthermore, early-age strength was greater when the MMA content were increased in the range of 20-40 % but the strength rather showed a tendency of decrease when the MMA content was 50 %.

• Elastomers and Composites
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• 제54권3호
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• pp.247-251
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• 2019

Two different urethane acrylates (mono-acrylate and di-acrylate) were used to prepare unsaturated polyester-based hybrid gel-coats. The physical properties and surface characteristics of these gel-coats were investigated on the basis of the content and type of urethane acrylate. The set-to-touch time increased and the physical properties (surface hardness and tensile strength) decreased with an increase in the urethane acrylate content. However, the type of urethane acrylate did not affect these parameters. It was found that the optimal urethane acrylate content for the application of unsaturated polyester-based hybrid gel-coats is ~10 wt%.

• 한국방재학회 논문집
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• 제4권2호
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• pp.29-34
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• 2004

철도차량의 내장재료로 사용되는 페놀수지의 laminate Panel과 sandwich panel의 화재특성을 콘칼로리미터를 이용하여 착화시간, 열방출율과 일산화탄소방출량을 비교, 조사하였다. 또한 기존 철도차량용 내장재료로 사용된 불포화 폴리에스터와 페놀수지와의 화재특성을 비교하였다. 페놀수지의 중량감소 및 열분해능을 DSC & TGA를 이용하여 측정하였다. 콘칼로미터 실험결과 착화시간, 열방출율 및 일산화탄소 생성량은 50kW 복사조건에서 더 높게 나타남을 알 수 있었으며, 동일한 복사열소건 하에서는 sandwich-페놀수지가 laminate-페놀수지보다 더 빨리 착화되었다. 기존 철도차량에 적용되었던 불포화 폴리에스터와 페놀수지와의 비교시험 결과 페놀수치의 화재성능이 발열량 및 일산화탄소 방출 모두에서 우수한 것으로 조사되었다.