• Title/Summary/Keyword: Waste rubber recycling technology

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Effects of a Crosslinking Agent and a Compatibilizer on the Mechanical and Rheological Properties of Waste PP and Waste Ground Rubber Tire Composites

  • Kim, Donghak;Kim, Seonggil;Lee, Minji;Lee, Chanhee;Lee, Horyong;Lee, Seongwoo;Lee, Suhyeon;Moon, Myeongsuk;Bang, Daesuk
    • Elastomers and Composites
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    • v.50 no.1
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    • pp.24-29
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    • 2015
  • In this study, we investigated the effects of a crosslinking agent and a compatibilizer on the mechanical and rheological properties of waste PP and waste ground rubber tire (WGRT) composites. In order to simulate a commercial TPV, the component of waste PP and WGRT was fixed at 30 and 70 wt%, respectively. With the simple addition of SEBS-g-MA into the waste PP/WGRT composites, the tensile strength of the composite was decreased, whereas both the elongation at break and impact strength were significantly increased because of rubbery characteristics of SEBS-g-MA. In order to further improve the properties of the composites, the waste PP/WGRT/SEBS-g-MA composites was revulcanized with dicumyl peroxide (DCP). As expected, mechanical properties of the revulcanized composites was generally improved. Especially, with 15 and 1 phr of SEBS-g-MA and DCP, elongation at break was highest value of about 183% because of the recross-linking of WGRT without chain scission of the main chain. It was found that complex viscosity of the revulcanized composite increased which might verify further vulcanization of the WGRT.

Preparation and Characterization of Polypropylene/Waste Ground Rubber Tire Powder Microcellular Composites by Supercritical Carbon Dioxide

  • Zhang, Zhen Xiu;Lee, Sung-Hyo;Kim, Jin-Kuk;Zhang, Shu Ling;Xin, Zhen Xiang
    • Macromolecular Research
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    • v.16 no.5
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    • pp.404-410
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    • 2008
  • In order to obtain 'value added products' from polypropylene (PP)/waste ground rubber tire powder (WGRT) composites, PP/WGRT microcellular foams were prepared via supercritical carbon dioxide. The effects of blend composition and processing condition on the cell size, cell density and relative density of PP/WGRT micro-cellular composites were studied. The results indicated that the microcellular structure was dependent on blend composition and processing condition. An increased content of waste ground rubber tire powder (WGRT) and maleic anhydride-grafted styrene-ethylene-butylene-styrene (SEBS-g-MA) reduced the cell size, and raised the cell density and relative density, whereas a higher saturation pressure increased the cell size, and reduced the cell density and relative density. With increasing saturation temperature, the cell size increased and the relative density decreased, whereas the cell density initially increased and then decreased.

Studies on Recycling of Waste Polyurethane (폐우레탄고무 재활용에 관한 연구)

  • Kim, Jin-Kook;Park, Kwang-Ok;Ha, Chang-Sik
    • Elastomers and Composites
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    • v.33 no.1
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    • pp.3-9
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    • 1998
  • The production of polyurethane polymer has been increased because of their unique properties and variety process methods available. The generation of their wastes also increases with products. These byproducts of industrialization seriously threaten the environmental demanding. Therefore, development of the recycling technologies have been required. The main propose of this study is to develop the recycling technology of waste polyurethane from a footwear scrap. This technique is composed of the following procedure : crushing, devulcanizing, pelletizing, washing and drying. The pellet was characterized with various methods. The recycled polyurethane(RPU) was blended with HIPS(high impact polystyrene) and investigated morphologically and rheologically. The experimental results showed that the addition of 20% HIPS to RPU was limited without mechanical performance of the superial properties of a virgin polyurethane. We believe that these technical information make possible to develop a rational engineering product.

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Effects of Ultrasonic Treatment and Particle Size on Mechanical Properties of Waste Polypropylene/WGRT Composites (초음파 처리와 분말 크기가 재생 폴리프로필렌/폐타이어 분말 복합체의 기계적 특성에 미치는 영향)

  • Kim, Donghak;Kim, Seonggil;Lee, Minji;Park, Jong-Moon;Oh, Myung-Hoon;Kim, Bong-Suk;Kim, Jinkuk;Bang, Daesuk
    • Resources Recycling
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    • v.24 no.2
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    • pp.36-45
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    • 2015
  • In this study, various sizes of waste ground rubber tire (WGRT) were devulcanized by a single screw extruder equipped with a sonicator in front of the die, and waste PP and devulcanized waste ground rubber tire (DWGRT) composites were prepared by an intermeshing co-rotating twin screw extruder. The crosslink density and percent devulcanization of WGRT and DWGRT for 40, 80 and 140 meshes were calculated. The mechanical properties of the composites were compared with each other. The effect of SEBS-g-MA as a compatibilizer was investigated on mechanical properties of both waste PP/WGRT and waste PP/DWGRT composites. The crosslink density was decreased with decreasing the WGRT size. On the other hand, the percent devulcanization was increased by adding the smaller size of WGRT. Also, tensile strength, impact strength and elongation at break of the composite with DWGRT were higher than those with WGRT. Especially, mechanical properties of the composites were significantly increased by adding the smaller size of WGRT and DWGRT. Addition of SEBS-g-MA into both waste PP/(D)WGRT composites exhibited better impact strength and elongation at break than the composites themselves.

Chemical Recycling Technology from Polyester Wastes (폴리에스터 폐자원의 화학적 재활용기술)

  • Han, Myung-Wan;Kang, Kyung-Suk;Song, Jae-Kyung
    • Elastomers and Composites
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    • v.47 no.2
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    • pp.96-103
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    • 2012
  • This paper reviews recent technologies for recycling poly (ethylene terephthalate) wastes. Wide application and non-biodegradability of the PET creates huge amounts of waste and disposal, leading to an environmental problem and economic loss. Chemical recycling can be a promising technology to deal with these problems by converting the waste into useful feedstock material for polyester production. Chemical recycling of polyethylene terephthalate are processes where the PET polymer chain is destructed by the impact of glycol (MEG) causing glycolysis, methanol causing methanolysis or water causing hydrolysis. After intensive purification polyester oligomers or the monomers MEG, dimethyl telephthalate (DMT) or purified terephthalic acid (PTA) are received which are re-used to produce polyester products.

Mechanical Properties and Thermal Stability of Waste PVC/HDPE Blend Prepared by Twin-screw Extruder

  • Lee, Rami;Park, Se-Ho;Baek, Jong-sung;Kye, Hyoungsan;Jhee, Kwang-Hwan;Bang, Daesuk
    • Elastomers and Composites
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    • v.54 no.1
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    • pp.7-13
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    • 2019
  • Recycling of waste polyvinyl chloride plastics has attracted much attention due to environmental problems, but the poor mechanical properties, low thermal stability, frequent breakage of strands, and melt cracking of the waste plastics have limited their widespread use. To overcome these disadvantages of waste PVC (W-PVC), recycled PVC powder blend was prepared by adding high-density polyethylene (HDPE) and ethylene vinyl acetate (EVA) as a heat stabilizer and compatibilizer, respectively. An intermeshing co-rotating twin screw extruder was used to prepare the blend, and the characteristics of the blend were analyzed by SEM and TGA, and by using a UTM and Izod impact tester. The impact strength was improved as the EVA content increased for the W-PVC/HDPE (80/20 wt%) blend. As the HDPE and EVA contents increased in the W-PVC/HDPE/EVA blend, the impact strength increased. SEM observations also revealed the improved interfacial adhesion for the EVA-containing blend.

A Study on Recycling Technology of Waste Tire Powder by Particle Size Distribution Analysis (입도분포해석에 의한 폐타이어 분말의 재활용 연구)

  • Hwang, Sung-Hyuk;Jung, Jae-Hum;Pack, So-Yoon;Kim, Jin-Kuk
    • Elastomers and Composites
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    • v.38 no.2
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    • pp.128-138
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    • 2003
  • It goes to be serious with environmental pollution because of great number of waste tires scrapped each you. That is why there are lots of studies for efficient recycle. We tried to reduce particle size of the waste tire powder using a new technology of self-designed grinding machine (SDGM) and ultrasonic treatment. The purpose of this study is to improve the physical properties of reduced waste tire powder. We investigated the fine powder by particle size distribution(PSD) analysis. And also we examined the physical and mechanical properties and cross-link density at various particle sire. Also we carried out morphological studies after making the products by SEM.

Effects of Peroxides on the Properties of Reclaimed Polypropylene/Waste Ground Rubber Tire Composites Prepared by a Twin Screw Extrusion

  • Kim, Seonggil;Lee, Minji;Lee, Hyeongsu;Jeong, Hobin;Park, Yuri;Jhee, Kwang-Hwan;Bang, Daesuk
    • Elastomers and Composites
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    • v.51 no.1
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    • pp.17-23
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    • 2016
  • In this study, the reclaimed polypropylene (RPP) and waste ground rubber tire (WGRT) were used to simulate the thermoplastic vulcanizate (TPV) for cost reduction and resources recycling. Also, we examined the effects of dicumyl peroxide (DCP) and 2,5-dimethyl-2,5-di-(tert-butylperoxy)-hexane (DTBPH) as peroxide type cross-linking agents to enhance the properties of TPV's. The components of RPP and WGRT were fixed at 30 and 70 wt%, and DCP and DTBPH were added in the concentrations from 0.5 to 1.5 phr, respectively. RPP/WGRT composites with different contents of DCP and DTBPH were prepared by a modular intermeshing co-rotating twin screw extruder. The Young's modulus of composites were decreased with increasing peroxides contents. On the other hand, tensile strength, elongation at break, and impact strength of the composites were increased with peroxide contents. We also confirmed that interfacial adhesion between RPP and WGRT was considerably improved by adding the peroxides. Taken together, DTBPH added RPP/WGRT composites exhibited better mechanical properties rather than those of DCP added composites.

Current Effective Recycling and Application Methods in Construction Waterproofing Industries (건설방수산업분야에서의 유효자원 재활용 및 응용 기술 현황)

  • Park, Jin-Sang;Kim, Sun-Do;Park, Wan-Goo;Kim, Dong-Bum;Lee, Jong-Yong;Oh, Sang-Keun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.4 no.1
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    • pp.31-37
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    • 2016
  • This paper intends to analyze the roles of regulations and certifications within the construction market that affect the effective recycling and application methods of construction waterproofing industries. Certifications, eco-labels, green certification patents, and new excellent technologies obtained in construction waterproofing industries are studied. In accordance to the study results, it was determined that, a total of 38 items obtained eco-labels with effective recycling as the theme, 10 items with green certifications, and 8 items with New Excellent Technologies. Regarding the types of effective recycled resources, most of them were concerned with composite-polymer(EVA, PVC, etc.) materials, waste tire powder, waste rubber, etc., which indicated that there is a clear limitation in the variety of the materials that are eligible for effective recycling in the construction waterproofing industries.