Fabrication of urea formaldehyde–epoxy resin microcapsules for the preparation of high self‐healing ability containing SBS modified asphalt

2021 ◽  
Author(s):  
Song Yang ◽  
Jiaqi Ji ◽  
Hua Tao ◽  
Yaseen Muhammad ◽  
Junxian Huang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Urea Formaldehyde ◽  
Self Healing ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt

scholarly journals Enhancing Effect of Waste Engine Oil Bottom Incorporation on the Performance of CR+SBS Modified Bitumen: A Sustainable and Environmentally-Friendly Solution for Wastes

2021 ◽  
Vol 13 (22) ◽  
pp. 12772
Author(s):  
Changjiang Liu ◽  
Qiuping Wang
Keyword(s):  
Asphalt Binder ◽  
Engine Oil ◽  
Chemical Compositions ◽  
Self Healing ◽  
Temperature Property ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Waste Engine Oil ◽  
Sbs Modified Asphalt ◽  
Low Temperature Property

Waste engine oil bottom (WEOB) is a hazardous waste whose effect as an additive to CR+SBS modified asphalt is rarely studied. In this study, the CR+SBS asphalt binder was modified with WEOB in different concentrations (3, 6, and 9 wt%). The GC–MS and FTIR were performed to evaluate the chemical compositions of WEOB and WEOBCR+SBS asphalt. The results showed that the main constituents of WEOB were similar to the functional groups of asphalt, along with maleic anhydride (MAH). Pavement performance-related rheological tests such as RV, temperature sweep (TS), FS, MSCR, and BBR were carried out. Results show that WEOBCR+SBS-6 exhibited the best high- and low-temperature property, followed by CR+SBS-3 and CR+SBS-9. Fluorescence microscope (FM) test, bar thin layer chromatograph (BTLC) test, FTIR, and AFM tests were carried out to evaluate the micro-morphologies and modification mechanism. The analysis revealed increased trends in resin fraction as opposed to asphaltene fraction with the increase of WEOB content. FTIR analysis revealed that the amide groups in WEOBCR+SBS asphalt bonded to the free radicals of CR. Moreover, a modification mechanism was elaborated. WEOB strengthens the cross-linked structure of CR+SBS polymers, reacting with SBS to graft onto MAH-g-SBS, and the free radical of CR interacts with the amide group in WEOB to form a bond. In addition, the content of lightweight components and surface roughness of SBS specimens were in good correlation, which contributed to the rutting resistance and adhesion and self-healing performance.

scholarly journals Preparation and Self-Repairing Properties of Urea Formaldehyde-Coated Epoxy Resin Microcapsules

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaoxing Yan ◽  
Yijuan Chang ◽  
Xingyu Qian
Keyword(s):  
Epoxy Resin ◽  
Deposition Time ◽  
Urea Formaldehyde ◽  
Coverage Rate ◽  
Core Material ◽  
Self Healing ◽  
Mass Ratio ◽  
Repair Rate ◽  
The Core ◽  
Five Factors

Urea formaldehyde resin-coated epoxy resin microcapsules were prepared by two-step in situ polymerization. The effects of five factors on the yield, coverage rate, repair rate, and morphology of the microcapsules were investigated by five factors and four levels of orthogonal test. These five factors were the mass ratio of the core to the wall material (Wcore:Wwall), the mass ratio of the emulsifier to the core material (Wemulsifier:Wcore), stirring rate, deposition time, and mass ratio of the emulsifier solution to the core material (Wemulsifier solution:Wcore). The ideal technological level of microcapsule synthesis was determined. According to the results of the range and variance of yield, coverage rate, and repair rate, the comprehensive properties of microcapsules became ideal. At this time, the Wcore:Wwall was 0.8 : 1, Wemulsifier:Wcore was 1 : 100, stirring rate was 600 r/min, deposition time was 32 h, and Wemulsifier solution:Wcore was 8 : 1. When the concentration of microcapsules in the epoxy resin was 10.0%, the self-repair rate was the best and the repair rate was 114.77%. This study is expected to provide a reference value for the preparation of a microcapsule self-healing technology and lay a foundation for the subsequent development of self-healing materials.

scholarly journals Hybrid Microcapsules Reinforced Smart Coatings for Corrosion Protection in Oil and Gas Industry

2020 ◽  
Author(s):  
Adnan Khan ◽  
Amani Hassanein ◽  
Abdul Shakoor ◽  
Ramazan kahraman ◽  
Fatima Montemor ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Epoxy Resin ◽  
Corrosion Protection ◽  
Oil And Gas ◽  
Steel Substrate ◽  
Urea Formaldehyde ◽  
Polymeric Coating ◽  
Layer By Layer ◽  
Self Healing ◽  
Linalyl Acetate

Corrosion is one of the critical causes of material loss in metal components. This research is focused on the synthesis, and electrochemical properties of polyelectrolyte layered microcapsules (PMCs) reinforced smart polymeric coating for corrosion protection of steel substrates. For this purpose, monolayer urea-formaldehyde microcapsules encapsulated with linalyl acetate (MLMCs) was synthesized by Insitu polymerization. In the next step, phenylthiourea (PTU) was loaded between the layers of polyelectrolytes; polyethylenimine (PEI) & sulfonated polyether ether ketone (SPEEK) on the surface of MLMCs using layer by layer technique. The MLMCs are sensitive to mechanical stress while the PTU in PMCs is triggered by pH stimulus. The newly designed PMCs has linalyl acetate in the core and PTU in the polyelectrolyte layers. Furthermore, 6 wt.% of both MLMCs and PMCs are dispersed in the epoxy resin and applied on the clean steel substrate. Performance comparison showed that the epoxy resin reinforced with PMCs demonstrate enhanced thermal, self-healing and electrochemical properties. This improved performance can be attributed to the efficient release of the self-healing agent and corrosion inhibitor from the PMCs. Conclusively, the epoxy coatings modified with PMCs can be a novel organic coating for the corrosion protection of oil and gas industries.

Development of self‐healing coatings based on urea‐formaldehyde/polyurethane microcapsules containing epoxy resin

2020 ◽  
Vol 137 (41) ◽  
pp. 49663 ◽  
Author(s):  
Sadaf Parsaee ◽  
S. Mojtaba Mirabedini ◽  
Ramin Farnood ◽  
Farhad Alizadegan
Keyword(s):  
Epoxy Resin ◽  
Urea Formaldehyde ◽  
Self Healing

Study on the Curing Kinetics of Epoxy Resin in Self-Healing Microcapsules with Different Shell Material

2011 ◽  
Vol 306-307 ◽  
pp. 658-662 ◽  
Author(s):  
Xiao Mei Tong ◽  
Min Zhang ◽  
Ming Zheng Yang
Keyword(s):  
Epoxy Resin ◽  
Urea Formaldehyde ◽  
Curing Kinetics ◽  
Core Material ◽  
Self Healing ◽  
Curing Process ◽  
Shell Material ◽  
Decomposition Products ◽  
The Stability ◽  
Kinetics Of

The curing process of self-healing microcapsules containing epoxy resin was studied with different shell material such as Poly (urea-formaldehyde), poly (melamine-urea-formaldehyde), Poly (urea-formaldehyde) modified by polyvinyl alcohol, and Poly (urea-formaldehyde) modified by phenol, respectively. The activation energy (ΔE) and the reaction order (n) have been obtained based on Kissinger method, Crane theory and Arrhenius equation. The results showed that: the curing process of epoxy resin as core material in self-healing microcapsules becomes more difficult compared with non-microencapsulated. The stability of shell material impacts on the cure process of core material. The resulting decomposition products of shell materials may participate in the curing reaction. So choosing suitable shell material is particularly important to self-healing microcapsules.

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