• Title/Summary/Keyword: PET(recycled PET)

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Development of Synthetic Sizing Agent Using Recycling Polyethylene Terephthalate and its Sizing Efficiency (Part 2) - Sizing efficiency of modified PET - (재활용 PET를 활용한 합성 사이즈제 개발 및 종이의 내수성 부여에 관한 연구 (제2보) - 개질 PET의 내수특성 평가 -)

  • Park, Jae-Seok;Kim, Hyoung-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.42 no.2
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    • pp.95-101
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    • 2010
  • For the development of higher-sizing performance of paper, a sizing agent using recycled PET was synthesised. Polyester resin was extracted from wasted PET by subcritical hydrolysis and finally modified to synthetic sizing agent by mixing water-disperse PET with triphenyl phosphite(TPP). The modified PET was considered as an internal sizing agent in different wet-end papermaking conditions. The optimum condition in sizing efficiency was obtained in initial pH of 6.5 in case of rosin+alum system, and 7.5 in case of rosin+alum+PET system, respectively, and in addition amount of PET 3%. The sizing efficiency was also closely related according to the fiber properties of wet-end slurry, such as virgin fibres from UKP and recycled fibres from KOCC. The application of modified PET was good in strength improvement of paper, specially in tensile strength.

Analysis of Frozen Reduction Effect and Economic Evaluation of Recycled PET-Soil (재활용 PET 재료를 이용한 골재의 동상저감 효과 분석 및 경제성 평가)

  • Shin, Eun Chul;Shin, Hui Su;Kim, Gi Sung
    • Journal of the Korean Geosynthetics Society
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    • v.13 no.4
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    • pp.153-159
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    • 2014
  • During the winter and spring seasons in Korea, structures such as buried water supply pipelines, roads, railways are frequently damaged due to frost heaving and thawing. Until now, the method of substituting the frost susceptible soil with the gravel or rubbles those are non-frost susceptible materials have been employed in Korea to prevent frost heaving. A series of laboratory soil tests and indoor frozen soil engineering experiments, as well as laboratory frost heaving tests were conducted for seeking the means of utilizing recycled PET bottles as substitute material.

The Prediction of Long-Term Creep Behavior of Recycled PET Polymer Concrete (PET 재활용 폴리머 콘크리트의 크리프 거동 예측)

  • Jo, Byung-Wan;Tae, Gi-Ho;Kwon, Oh-Hyuk
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.320-323
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    • 2004
  • In general, polymer concrete has more excellent mechanical properties and durability than Portland cement concrete, but very sensitive to heat and has large deformations. In this study, the long-term creep behaviors was predicted by the short-term creep test, and then the characteristic of creep of recycled-PET polymer concrete was defined by material and experimental variables. The error in the predicted long-term creep values is less than 5 percent for all polymer concrete systems. The filler carry out an important role to restrict the creep strains of recycled PET polymer concrete. The creep strain and specific on using the CaCO3 were less than using fly-ash. the creep increases with an increase in the applied stress, but not proportional the rate of stress increase ratio. The creep behavior of polymer concrete using recycled polyester resin is not a linear viscoelastic behavior.

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Mechanical Characteristics of Recycled PET Polymer Concrete with Demolished Concrete Aggregates (PET와 재생골재를 이용한 폴리머콘크리트의 역학적 특성)

  • Jo Byung-Wan;Lee Du-Wha;Park Seung-Kook
    • Journal of the Korea Concrete Institute
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    • v.17 no.3 s.87
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    • pp.335-342
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    • 2005
  • In this paper, fundamental properties of Polymer Concrete(PC), made from unsaturated polyester resin based on recycled PET and recycled aggregate were investigated. Mechanical properties include strength, modulus of elasticity, and chemical resistance. Resins based on recycled PET and recycled aggregate offer the possibility of low source cost for forming useful products, and would also help alleviate an environmental problem and save energy. The results of test for resin contents and recycled aggregate ratio we, first, the strength of Polymer Concrete made with resin based on recycled PET and recycled aggregate increases with resin contents relatively, however beyond a certain resin contents the strength does not change appreciably, Second, the relationship between the compressive strength and recycled aggregate ratio at resin $9\%$ has a close correlation linearly whereas there is no correlation between the compressive strength and the flexural strength of RPC with recycled aggregate ratio. Third, the effect of acid resistance at resin $9\%$ was found to be nearly unaffected by HCI, whereas the PC with $100\%$ recycled aggregate showed poor acid resistance. Unlike acid, alkali nearly does not seem to attack the RPC as is evident from the weight change and compressive strength. And last, In case of stress-strain curve of polymer concrete with $100\%$ of natural aggregate and $100\%$ recycled aggregate it is observed the exceptional behavior resulting in different failure mechanisms of the material under compression.

Study on Recycling of Air filter PET/PP mixed Plastics from Automobiles (자동차(自動車) Air Filter PET/PP 혼합(混合) 폐(廢)플라스틱의 재활용(再活用)에 관(關)한 연구(硏究))

  • Ahn, Tae-Kwang;Kim, Hea-Tae
    • Resources Recycling
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    • v.17 no.3
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    • pp.21-28
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    • 2008
  • Using the post-consumer waste and edge scrap mixed PET with small amount PP air filter elements of automobiles. It was studied that these mixed waste plastics of the various types of the PET were practicable for the material recycling. Various waste PET/PP plastics were collected, crushed, dried in vacuum, and extruded to recycled PET/PP chips. These chips were mixed with three kinds compatibilizers, EVA, MBS, and recycled PVB of the ratio of $3{\sim}10wt.%$ for the purpose of the compatibility for the post-consumer waste and edge scrap. We investigated mechanical and thermal properties of PET/PP mixtures which were compound with the weight ratio of compatibilizers. Compatibilizer, MBS application was showed the most excellent mechanical properties in the range of the $3{\sim}5wt.%$ EVA application was displayed good impact strength and thermal property in the range of $3{\sim}5wt.%$ Last, recycled PVB application was showed poor mechanical properties in the whole range ratio of the PVB.

Setting Shrinkage, Thermal Expansion Coefficient and Compressive Strength of Recycled PET Polymer Concrete with Montmorillonite (몬모릴로라이트를 이용한 재활용 PET폴리머 콘크리트의 경화수축, 온도팽창계수, 압축강도)

  • Jo Byong-Wan;Tae Ghi-Ho;Lee Du-Wha
    • Journal of the Korea Concrete Institute
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    • v.16 no.2 s.80
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    • pp.205-212
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    • 2004
  • Recently, as concerns over environmental issues are raised more and more trend to use recycled waste for producing construction materials is also raised. Especially, a case of waste resin is considerably destroying the environment due to disposal way that most waste resin produced is disposed of landfill. This study is performed by polymer concrete with recycled PET resin in terms of obtaining safely clean construction resources and protection of environment. High setting shrinkage and sensitivity to heat are main disadvantages of Polymer Concrete (PC) despites of a lot merits. The aim of this study is to investigate basic properties such as setting shrinkage, length change and sensitivity to heat about PET recycled polymer concrete. The other is to check the possibility of use of Montmorillonite as one of a lot of additive without special coupling agent. As results of experiments, various properties of polymer concrete with recycled PET resin are similar with conventional PC except that polymerization time is longer. Montmorillonite was efficiently used to reduce setting shrinkage, length change and coenicient of thermal expansion related to heat with enhanced strength

Manufacture of Recycled PET E-Textile by Plasma Surface Modification and CNT Dip-Coating (플라즈마 표면 개질과 CNT 함침공정을 통한 고전도성의 재생PET사 전자섬유)

  • Jun-hyeok Jang;Sang-un Kim;Joo-Yong Kim
    • Science of Emotion and Sensibility
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    • v.26 no.1
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    • pp.79-86
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    • 2023
  • This study aims to create a highly conductive E-textile made by recycling PET with a Dip-coating process. PET fiber with hydrophobic properties is characterized by the difficulty in imparting great conductivity when both Virgin and Recycled are made of electronic fibers through a Dip-coating process. To advance the effectiveness of the Dip-coating process, a sample made of recycled PET was surface modified for 50 w 5 minutes and 10 minutes employing a Covance-2mprfq model from FEMTO SCIENCE. After that, the sample was immersed in an SWCNT dispersion (.1 wt%, Carbon Co., Ltd.) for 5 minutes, and then dip coating was conducted to allow the solution to permeate well into the sample through a padder (DAELIM lab). After the procedure was completed, the resistance measurement was measured with a multimeter at both ends and then accurately remeasured with a wider electrode. As a result of this contemplation, it was affirmed that great conductivity might be given through an impregnation process through the plasma surface modification. When the surface modification was performed for 10 minutes, the resistance was reduced by up to 2.880 times. Dependent on the results of this research, E-fibers employed in the smart wearable sector can also be made of recycled materials, improving smart wearable products that can save oil resources and reduce carbon emissions.

The Prediction of tong-Term Creep Behavior of Recycled PET Polymer Concrete (단기 크리프 실험을 이용한 PET 재활용 폴리머콘크리트의 장기 크리프거동 예측)

  • Jo Byung-Wan;Tae Ghi-Ho;Kim Chul-Hwan
    • Journal of the Korea Concrete Institute
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    • v.16 no.4 s.82
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    • pp.521-528
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    • 2004
  • In general, polymer concrete has more excellent mechanical properties and durability than Portland cement concrete, but very sensitive to heat and has large deformations. In this study, the long-term creep behaviors was predicted by the short-term creep test, and then the characteristic of creep of recycled-PET polymer concrete was defined by material and experimental variables. The error in the predicted long-term creep values is less than 5 percent for all polymer concrete systems. The filler carry out an important role to restrict the creep strains of recycled PET Polymer concrete. The creep strain and specific on using the $CaCO_3$ were less than using fly-ash. The creep increases with an increase in the applied stress, but not proportional the rate of stress increase ratio. The creep behavior of polymer concrete using recycled polyester resin is not a linear viscoelastic behavior.

Study on the Market Conditions and Quality Evaluation Methods of post-consumer Recycled Polyethylene Terephthalate (PCR PET) Flake (재생 페트 플레이크의 시장 현황과 품질 평가 방안 연구)

  • Joo, Minjung;Suh, Sang Uk;Lee, Ka Eun;Oh, Jae Young
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.26 no.1
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    • pp.41-46
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    • 2020
  • PCR PET flake's market endeavors difficult situations of its oversupply and decreasing demands in South Korea. Since China banned the import of most recycled plastics, flake producers who mostly export the flakes lost their biggest market. The producers struggled to survive in the competitions with PCR PET flake from EU and 3rd countries but it was challenging due to substandard quality and increasing cost. Attempts to improve the quality of PCR PET flake have been made but they were only an individual company's efforts. The objective of this study was to understand the market status on PCR PET flake in South Korea and to present suggestions for improving its quality. The results of the questionnaires targeted to flake producers showed that no testing methods on PCR PET flake were standardized and there were critical factors to the quality such as moisture content, contaminants, and viscosity. Case studies of US, Japan and other countries had been done especially about testing methods and 76 samples from 21 companies were tested according to those methods. Based on the results, the final factors were decided as contaminants, moisture content, alkalinity index and intrinsic viscosity. There is a plan to standardize testing methods and they could be guidelines to improve the business competitiveness of PCR PET flake in South Korea.

Strength and Crack Resistance Properties of Fiber Reinforced Concrete Mixed with Recycled PET Fiber (재생 PET 섬유가 혼입된 섬유 보강 콘크리트의 강도 및 균열저항 특성)

  • Kim, Sung-Bae;Kim, Hyun-Young;Yi, Na-Hyun;Kim, Jang-Ho Jay
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.1
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    • pp.102-108
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    • 2010
  • The main objective of this study was to evaluate the effect of recycled PET (RPET) fiber made from waste PET bottles to examine application on concrete member. To evaluate the reinforcement effect of RPET fiber in concrete member, experimental tests were performed, such as mechanical property tests (compressive strength, modulus of elasticity and splitting tensile strength) and drying shrinkage test. In mechanical property tests, compressive strength and modulus of elasticity in concrete mixed with RPET fiber gradually decreased, but splitting tensile strength gradually increased as volume fraction of fiber increased. In drying shrinkage test, free drying shrinkage increased. In restrained case, in contrast, crack occurrence was delayed because of tensile resistance increase by RPET fiber. The comparison of RPET and PP fiber added concrete specimen's properties showed that two materials had similar properties. In conclusion, RPET fiber is an alternative material of PP fiber, even finer for its excellence in eco-friendliness due to the recycling of waste PET bottles and its possible contribution to the pollution declination.