Analysis of the chemical properties and high-temperature rheological properties of MDI modified bio-asphalt

Shao, Linlong; Wang, Hainian; Zhang, Ran; Zheng, Wen‐Hua; Hossiney, Nabil; Wu, Chengzhi

doi:10.1016/j.conbuildmat.2020.121044

Cited by 33 publications

(7 citation statements)

References 31 publications

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“…Compared with the cured SD and SDT cured adhesives, an obvious novel signal was found in 2268 cm − 1 . This is the characteristic adsorption signal of -NCO(Shao et al, 2021; Stuart, 2021;Zhao et al, 2011), and signi es that MDI involved in the curing process. Besides that, the 755 and 1408 cm − 1 peaks are novel signals of cured SDTM20 adhesive, re ecting the isocyanurate rings and C-N stretching vibration of isocyanurate rings(Gao et al, 2011;Li et al, 2021;Reignier et al, 2021).…”

mentioning

confidence: 71%

A high curing efficiency sucrose-based adhesive via two-step modification by toluene-4-sulfonic acid and methylenediphenyl diisocyanate

Lin,

Cai,

Zhang

et al. 2023

Eur. J. Wood Prod.

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Sucrose-based adhesives utilize renewable biomass material sucrose as the main ingredient, which are ecofriendly and non-toxic, making them attractive potential substitutes for formaldehyde-based wood adhesives. However, wood-based panel processing using sucrose-based adhesives requires extraordinary harsh conditions with high hot-pressing temperatures (≥170 ℃), limiting practical applications. In this study, the sucrose-based adhesive (SD adhesive) was modi ed by toluene-4-sulfonic acid (TsOH) and methylenediphenyl diisocyanate (MDI) in two steps. The sucrose-based solution (SS) of the optimal adhesive in the study (SDTM20 adhesive) was synthesized with 5%TsOH catalyst at 100 ℃ for 3h, and then 20%MDI curing agent was added, followed by mixing. After that, the curing behavior, curing mechanism and microscopic characterization was used to analyze the optimal prepared materials. The wet shear strength (0.80 MPa) of the prepared adhesive meets the GB/T 9846-2015 China National Standard (≥0.7 MPa). 13 C NMR showed that the TsOH catalyst promoted the formation of aromatic compounds, oligosaccharides and carbonyls, and the 5-HMF content of the SS in SDTM20 adhesive (44.0 g/L) was 158.8% higher than that of SD adhesive. In addition, the thermal curing behavior of SDTM20 adhesive was explained by changes in insoluble mass proportion (IMP) and TG-DSC thermal analysis. From the IMP measurement, SDTM20 adhesive (61.2%) increased by 141.9% compared with the SD adhesive.Additionally, in TG-DTG and DSC curves, the rapid weight loss temperature (145.1 ℃) corresponded to the endothermic reaction temperature (135.3 ℃), implying that the main curing reaction occurred at approximately 140 ℃, indicating that it is possible to improve curing e ciency of SD adhesive. ATR-FTIR was used to evaluate the curing mechanism of the SDTM20 adhesive. After adding TsOH/MDI, the dehydration reaction of sucrose, caramelization reaction, and Maillard reaction were accelerated to improve the curing e ciency. A complex polymeric cross-linking network structure with isocyanurate rings was generated, mainly connected by dimethyl ether bridges. SEM analysis of the microstructure of the adhesive revealed unknown crystal substances and small bubble pores on the fracture surface of the modi ed SDTM adhesive, showing that a novel cross-linking reaction had occurred.

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mentioning

confidence: 71%

A high curing efficiency sucrose-based adhesive via two-step modification by toluene-4-sulfonic acid and methylenediphenyl diisocyanate

Lin,

Cai,

Zhang

et al. 2023

Eur. J. Wood Prod.

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“…Sulfur-containing compounds and condensed aromatics are attached to the condensed ring region, resulting in different rheological properties of bio-asphalt. Shao et al 82 studied the relationship between the chemical properties and high-temperature rheological properties of 4,4′-diphenylmethane diisocyanate (MDI)-modified bio-asphalt. The finding showed that the urethane functional group had a good correlation with rheological characteristic parameters of modified bio-asphalt.…”

Section: Structural Characterization Of Bio-oilmentioning

confidence: 99%

Progress and Perspective of Bio-asphalt Preparation, Structural Characterization, and Rheological Properties

Cao,

Quan,

Deng

et al. 2024

Energy Fuels

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As a renewable resource that can replace petroleum asphalt, bio-asphalt has been extensively studied in the past decade. To further advance the utilization of bio-asphalt in road construction, the preparation, structural characterization, and rheological characteristics of bio-asphalt were reviewed. First, the production procedure of biomass pyrolysis and liquefaction for bio-oil generation was outlined. The impact of preparation parameters on the yield and optimal parameter selection for preparing bio-asphalt was analyzed. Second, the structural characterization methods of bio-oil and the effect of the bioasphalt chemical structure on rheological properties were summarized. On the basis of the colloidal theory, the colloidal instability index is employed to assess the stability of the colloidal structure in bio-asphalt, and the influence of colloidal stability on rheological properties was further analyzed. The research progress of the molecular dynamics method on the rheological characteristics of bio-asphalt was reviewed, and the influence of the intermolecular force of the bio-asphalt system on the aggregation and diffusion behavior of asphaltene clusters was expounded. Finally, a method of simulating heavy oil by using mesoscopic dynamics was summarized, and the feasibility of simulating the rheological behavior of bio-asphalt by mesoscopic dynamics was pointed out.

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“…At room temperature, bio-oils are free-flowing organic liquids [ 26 , 27 , 28 ]. Many biomass sources, such as waste wood [ 25 , 29 ], corn stover [ 30 ], animal wastes [ 31 , 32 ], rapeseed and soybeans [ 33 , 34 ], tea and coffee residue [ 35 , 36 ], microalgae [ 14 ], urban yard waste [ 37 ], and other biomass sources are used to make bio-oils. Various bio-oils are shown in Figure 3 .…”

Section: Characteristics Of Bio-oilsmentioning

confidence: 99%

“…The great variabilities in the characteristics of bio-oils as well as some unsatisfactory properties of bio-asphalt binders and mixtures have become the important influencing factors in restricting the application of bio-oils in asphalts. Therefore, many scholars have also focused on improving the performance of bio-asphalts by adding other additives, such as SBS, nanomaterials, and others [ 2 , 12 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts

Zhang

You

et al. 2021

Molecules

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Transforming waste biomass materials into bio-oils in order to partially substitute petroleum asphalt can reduce environmental pollution and fossil energy consumption and has economic benefits. The characteristics of bio-oils and their utilization as additives of asphalts are the focus of this review. First, physicochemical properties of various bio-oils are characterized. Then, conventional, rheological, and chemical properties of bio-oil modified asphalt binders are synthetically reviewed, as well as road performance of bio-oil modified asphalt mixtures. Finally, performance optimization is discussed for bio-asphalt binders and mixtures. This review indicates that bio-oils are highly complex materials that contain various compounds. Moreover, bio-oils are source-depending materials for which its properties vary with different sources. Most bio-oils have a favorable stimulus upon the low temperature performance of asphalt binders and mixtures but exhibit a negative impact on their high-temperature performance. Moreover, a large amount of oxygen element, oxygen-comprising functional groups, and light components in plant-based bio-oils result in higher sensitivity to ageing of bio-oil modified asphalts. In order to increase the performance of bio-asphalts, most research has been limited to adding additive agents to bio-asphalts; therefore, more reasonable optimization methods need to be proposed. Furthermore, upcoming exploration is also needed to identify reasonable evaluation indicators of bio-oils, modification mechanisms of bio-asphalts, and long-term performance tracking in field applications of bio-asphalts during pavement service life.

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Analysis of the chemical properties and high-temperature rheological properties of MDI modified bio-asphalt

Cited by 33 publications

References 31 publications

A high curing efficiency sucrose-based adhesive via two-step modification by toluene-4-sulfonic acid and methylenediphenyl diisocyanate

A high curing efficiency sucrose-based adhesive via two-step modification by toluene-4-sulfonic acid and methylenediphenyl diisocyanate

Progress and Perspective of Bio-asphalt Preparation, Structural Characterization, and Rheological Properties

A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts

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