Understanding the role of waste cooking oil residue during the preparation of rubber asphalt

Ma, Jianmin; Hu, Mingjun; Sun, Daquan; Tong, L.; Sun, Guoqiang; Ling, Senlin; Xu, Lei

doi:10.1016/j.resconrec.2020.105235

Cited by 50 publications

(25 citation statements)

References 51 publications

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“…Nevertheless, a noticeably stronger effect was observed for the waste-type oil, which could be attributed to the presence of lower-molecular weight fractions, possibly even glycerol and free fatty acids [47]. The lower molecular weight compounds present in the waste oil can also efficiently swell the rubber particles enhancing the interactions with the reacting mixture, which may beneficially influence the compatibility of GTR with foamed polyurethane matrix [48,49]. Qualitatively, a similar effect may be noted for the fresh oil.…”

Section: Resultsmentioning

confidence: 99%

Structural Changes and Their Implications in Foamed Flexible Polyurethane Composites Filled with Rapeseed Oil-Treated Ground Tire Rubber

et al. 2021

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The utilization of post-consumer car tires is an essential issue from an ecological and economic point of view. One of the simplest and the least harmful methods is their material recycling resulting in ground tire rubber (GTR), which can be further applied as fillers for polymer-based composites. Nevertheless, insufficient interfacial interactions implicate the necessity of GTR modification before introduction into polymer matrices. In this study, we investigated the influence of rapeseed oil-assisted thermo-mechanical treatment of GTR using a reactive extrusion process on the processing, structure, and performance of flexible polyurethane/GTR composite foams. Applied modifications affected the processing of polyurethane systems. They caused a noticeable reduction in the average cell size of foams, which was attributed to the potential nucleating activity of solid particles and changes in surface tension caused by the presence of oil. Such an effect was especially pronounced for the waste rapeseed oil, which resulted in the highest content of closed cells. Structural changes caused by GTR modification implicated the enhancement of foams’ strength. Mechanical performance was significantly affected by the applied modifications due to the changes in glass transition temperature. Moreover, the incorporation of waste GTR particles into the polyurethane matrix noticeably improved its thermal stability.

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Section: Resultsmentioning

confidence: 99%

Structural Changes and Their Implications in Foamed Flexible Polyurethane Composites Filled with Rapeseed Oil-Treated Ground Tire Rubber

et al. 2021

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“…As a result, more energy was required to form and especially grow the cells during the polymerization of the polyurethane matrix. Moreover, the presence of oil during extrusion treatment of GTR at elevated temperature may result in swelling of rubber particles leading to enhanced interfacial interactions with polyurethane matrix [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Ground Tire Rubber Filled Flexible Polyurethane Foam—Effect of Waste Rubber Treatment on Composite Performance

et al. 2021

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The application range of flexible polyurethane (PU) foams is comprehensive because of their versatility and flexibility in adjusting structure and performance. In addition to the investigations associated with further broadening of their potential properties, researchers are looking for new raw materials, beneficially originated from renewable resources or recycling. A great example of such a material is ground tire rubber (GTR)—the product of the material recycling of post-consumer car tires. To fully exploit the benefits of this material, it should be modified to enhance the interfacial interactions between PU and GTR. In the presented work, GTR particles were thermo-mechanically modified with the addition of fresh and waste rapeseed oil in the reactive extrusion process. The introduction of modified GTR particles into a flexible PU matrix caused a beneficial 17–28% decrease in average cell diameters. Such an effect caused an even 5% drop in thermal conductivity coefficient values, enhancing thermal insulation performance. The application of waste oil resulted in the superior mechanical performance of composites compared to the fresh one and thermo-mechanical modification without oils. The compressive and tensile performance of composites filled with waste oil-modified GTR was almost the same as for the unfilled foam. Moreover, the introduction of ground tire rubber particles enhanced the thermal stability of neat polyurethane foam.

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“…When the RRMA was stored at high temperature, as the density of reclaimed rubber powder was higher than the asphalt, the reclaimed rubber powder uniformly distributed in the asphalt phase was prone to sedimentation and segregation under the action of gravity. The segregation rate (as shown in Equation (1)) was used as an indicator to evaluate the storage stability of modified asphalt [ 28 ]. S r = [( G b */sin δ b )/( G t */sin δ t )] − 1 where S r is segregation rate, G t *, G b * are the upper and lower complex modulus, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be attributed to the fact that the LBP containing active aromatic components not only sufficiently swelled the reclaimed rubber powder, but also made the density of the LBP activated reclaimed rubber powder closer to the density of the base asphalt. As a result, the storage stability of LBP activated reclaimed rubber powder modified asphalt was improved [ 23 , 25 , 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…Surprisingly, reclaimed rubber powder, prepared by destroying the molecular cross-linking structure of ordinary rubber powder, modified asphalt, which effectively solved the problems of high viscosity, inferior compatibility and difficult construction of universal rubber powder modified asphalt [ 21 , 22 , 23 , 24 ]. The reason for this was that under the action of high temperature and high shear force, the surface of reclaimed rubber powder produces some active groups, which is conducive to the chemical bonding with asphalt, improving the storage stability of the modified asphalt [ 25 , 26 , 27 , 28 ]. For example, Wang et al [ 26 ] evaluated the performance of devulcanized rubber asphalt based on rheology and environmental effects.…”

Section: Introductionmentioning

confidence: 99%

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Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Kong

Yang

et al. 2021

Materials

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The purpose of this research was to make full use of waste lubricating by-products (LBP) and reclaimed rubber powder (RR) to modify asphalt by a one-pot approach, so as to achieve the dual purpose of solving the poor storage stability of reclaimed rubber powder modified asphalt (RRMA) and the realization of solid waste recycling. A variety of characterization techniques were performed to analyze storage stability, conventional properties and microstructure of LBP-activated reclaimed rubber powder modified asphalt (Blend). Fourier transform infrared spectroscopy illustrated that not only the chemical composition of LBP was very similar to that of asphalt, but also the activation of LBP improved the compatibility of RR with asphalt and enhanced the storage stability of Blend. Fluorescence spectrum and scanning electron microscopy results indicated that the RR without LBP activation was aggregated and dispersed as blocks in asphalt, while the LBP activated RR was uniformly dispersed in the asphalt phase. The segregation test demonstrated that Blend exhibited outstanding storage stability, in which the softening point difference was within 2.5 °C and the segregation rate was −0.2–0.2. In addition, the conventional properties of Blend have been significantly improved, especially in penetration and ductility. More importantly, the short-term aging results demonstrated that, compared with RRMA, Blend possessed excellent anti-aging performance.

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Understanding the role of waste cooking oil residue during the preparation of rubber asphalt

Cited by 50 publications

References 51 publications

Structural Changes and Their Implications in Foamed Flexible Polyurethane Composites Filled with Rapeseed Oil-Treated Ground Tire Rubber

Structural Changes and Their Implications in Foamed Flexible Polyurethane Composites Filled with Rapeseed Oil-Treated Ground Tire Rubber

Ground Tire Rubber Filled Flexible Polyurethane Foam—Effect of Waste Rubber Treatment on Composite Performance

Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

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