Study on the new polyurethane material suitable for foaming in water

Li, Manjun; Fang, Hongyuan; Zhang, Chao; Du, Mingrui; Wang, Fuming

doi:10.1016/j.conbuildmat.2022.129163

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…The compressive strength is followed by a reduction rate of approximately 18%, while the flexural strength exhibits the lowest reduction rate at around 15%. The polyurethane material experiences a more significant decrease in strength during the initial 8 h immersion period, followed by a slightly lesser reduction from 8 to 16 h, and a further decrease after 20 h. This phenomenon can potentially be attributed to the porous structure of the polyurethane specimens [ 32 ]. During the initial stage of immersion in water, the specimen exhibits a notable water absorption capacity and rate.…”

Section: Resultsmentioning

confidence: 99%

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Study on the Gelation Process and Mechanical Properties of Organic Polymer Grouting Materials Applied to Fissure Sealing in Underground Mines

Zhang,

Wang

2024

Polymers

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In this study, organic polymer polyurethane grouting materials were prepared using isocyanate and polyether polyol as the main agents and various additives, the slurry coagulation process was investigated, and the mechanical properties of the polymer samples were tested to explore the influence of the density and soaking time of the polymer on the strength of the samples. The microstructure of the polymer was observed via electron microscopy, and relying on image analysis software, the structural parameters of the polymer cell were analyzed and calculated; the model equation between density and yield strength was established based on the strength model of porous materials developed by Gibson and Ashby. The results show that the initial viscosity and gel time of the polyurethane slurry decrease with the increase of the initial temperature, and the viscosity changes abruptly when the slurry reaches the gel point. The mechanical properties of the polymer increased with increasing density and decreased with increasing soaking time. The interior of the polymer is a porous structure and the pores are approximately spherical; the higher the density of the polymer material, the more uniform the stress distribution of the material, and the higher the percentage of the matrix, which in turn leads to better mechanical properties of the material. The diameter of the polymer cell is negatively correlated with the density, and the model established based on the microscopic parameters of the cell can better predict the yield strength of the polymer. This study helps to deepen the understanding of the microstructure and mechanical properties of polyurethane and provides a certain reference for the application of polyurethane in underground mine reinforcement engineering.

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Section: Resultsmentioning

confidence: 99%

“…thane specimens [32]. During the initial stage of immersion in water, the specimen exhibits a notable water absorption capacity and rate.…”

Section: Effect Of Soaking Time On Polymer Strengthmentioning

confidence: 96%

Study on the Gelation Process and Mechanical Properties of Organic Polymer Grouting Materials Applied to Fissure Sealing in Underground Mines

Zhang,

Wang

2024

Polymers

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“…Organic materials typically have higher injectability, shorter and more controllable setting times, and higher early strength, but they are expensive. Polyurethane slurries [35,36] and acrylic slurries [37,38] have found extensive application in practical engineering.…”

Section: Organic Grouting Materialsmentioning

confidence: 99%

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Du,

Li,

Fang

et al. 2024

Applied Sciences

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China is renowned for its extensive underground engineering projects and the complex geological and hydrological conditions it faces. Grouting treatment technology is widely employed in deep-buried mines and tunnels, where grouting parameters such as materials, pressure, volume, and hole arrangement significantly impact the effectiveness of grouting. This review paper comprehensively examines current research on grouting materials, theories, experiments, and numerical simulations. It summarizes the various factors that must be considered during the grouting process of fissures and explores the diffusion mechanisms of grout under their influence. Furthermore, further research is needed on the mechanisms and treatment methods for poor grouting in rock masses, the distribution patterns of fissures, optimization methods for grouting parameters, and grout quality assessment techniques. Future research should focus on developing more efficient experimental methods with higher accuracy levels while advancing grouting technologies. Establishing comprehensive and accurate rock mass models along with improving monitoring capabilities are also crucial aspects to consider. Therefore, studying the diffusion mechanisms of grout in fissured rock masses is of significant importance for the practical operation of underground engineering projects.

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“…Polyurethane foam are polymers formed by the reaction of isocyanates with polyols, and when pre-polyurethane is mixed with water, a polymerization reaction occurs and a large amount of carbon dioxide is released [ 22 ]. During this process, the material transitions from a liquid to a solid state, forming foamed polyurethane, which has been widely employed in the manufacturing and construction industry [ 23 , 24 ]. Given the characteristics of the foamed polyurethane formation process, it is theoretically well-suited for filling irregular structures.…”

Section: Introductionmentioning

confidence: 99%

Injectable and in situ foaming shape-adaptive porous Bio-based polyurethane scaffold used for cartilage regeneration

Bahatibieke,

Wei,

Feng

et al. 2024

Bioactive Materials

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Study on the new polyurethane material suitable for foaming in water

Cited by 12 publications

References 22 publications

Study on the Gelation Process and Mechanical Properties of Organic Polymer Grouting Materials Applied to Fissure Sealing in Underground Mines

Study on the Gelation Process and Mechanical Properties of Organic Polymer Grouting Materials Applied to Fissure Sealing in Underground Mines

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Injectable and in situ foaming shape-adaptive porous Bio-based polyurethane scaffold used for cartilage regeneration

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