Research Progress of Rain Erosion of Polyurethane Coating

Sun, Chen Yang; Meng, Jiang Yan; Fan, Jin Juan; Sun, Wei; Liu, Chang Kui

doi:10.4028/p-rc2jls

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…At present, the traditional methods of spraying to block air leakage in mines mainly include foam resin spraying, concrete spraying, fly ash filling, etc. [6][7][8][9][10]. However, it is not suitable for the process of resin spraying, and it is not suitable for the operation of resin spraying.…”

Section: Introductionmentioning

confidence: 99%

Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry

Liu¹,

Shao²,

et al. 2022

Minerals

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In view of the problems of traditional spraying technology, such as complex processes, high costs, large dust amounts, and poor air leakage effects, a new composite spraying slurry is proposed in this paper, which takes clay as the main base material and uses water pressure and wind pressure to ensure intrinsic safety. Firstly, the airtightness, bending resistance, and viscosity of the spraying material were measured in the laboratory; secondly, the gas–liquid–solid three-phase flow process involved in the spraying process was simulated by using the CFD-DPM method, adopting the Eulerian two-fluid model for continuous gas–water two-phases and the discrete phase DPM model for dust generation, and the transport, diffusion, and full space-time distribution characteristics of dust generation were studied. The research shows that: (1) the new composite slurry spraying material made of clay as the main material is made by adding a small proportion of cement and engineering fiber to increase the toughness of the material, and finally, determining the mass ratio of the composite material as follows: clay: cement: additive: engineering fiber = 84:14:1.85:0.15. It has good sealing and bending resistance and good adhesion; (2) the water phase distribution under the action of spray determines the distribution of solid-phase dust, and the distribution area of dust is similar to that of the water phase; (3) under the action of spray, the area at the bottom of the roadway is covered by dust flow, and the dust in this area is obviously stratified. The particle size of the dust gradually decreases from bottom to top. The large particle size dust is deposited at the bottom, while the small particle size dust is suspended at a certain height, and the diffusion area gradually increases; (4) the effect of spray angle on dust is mainly manifested in the initial dust flow shape and dust diffusion time. The larger the spray angle, the faster the diffusion; (5) when the water velocity at the nozzle outlet is large, the dust concentration is low in the whole area, but in areas higher than 1.5 m, the PM2.5 concentration also increases with the increase in water flow. The dust suppression effect of larger a water flow is mainly reflected in the bottom area, and the disturbed surrounding airflow can make PM2.5 diffuse to higher areas.

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Section: Introductionmentioning

confidence: 99%

Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry

Liu¹,

Shao²,

et al. 2022

Minerals

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show abstract

“…At present, the traditional methods of spraying to block air leakage in mines mainly include foaming resin spraying, concrete spraying, fly ash filling, etc. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The foaming resins mainly include Rockwell and polyurethane, but their use process and operation process are cumbersome, and the purchase cost is high, so they are not suitable for large-area spraying operations.…”

Section: Introductionmentioning

confidence: 99%

Study on Influence Law of Key Factors of New Composite Slurry Spraying Technology

Gan¹,

Shao²,

et al. 2022

Sustainability

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In this paper, a new type of water pressure and air pressure composite slurry is proposed to ensure the safety of spraying. Firstly, the air tightness, bending resistance and viscosity of the spraying material were measured in the laboratory. Secondly, the two-fluid VOF model was used to analyze the influence laws of the spraying process, the spraying area formed on the wall, the thickness of the spraying layer and the pressure at the nozzle (or initial flow rate), the spraying distance, the spraying time, and the spraying direction. The research shows that (1) the new composite slurry spraying material made of clay:cement:additive:engineering fiber = 84:14:1.85:0.15 has suitable sealing and bending resistance and adhesion. (2) The smaller the spraying distance is, the larger the spraying area formed on the side wall in a short time, and the shape is regular, but the spraying area is relatively small. The spraying area increases with the increase in spraying distance, and the slurry thickness becomes thinner with the increase in spraying distance. (3) When the initial spraying speed is high, the shape of the spraying area is regular, the spraying thickness is large and the uniformity is suitable, but the shape and uniformity of the spraying area are related to the time when the slurry reaches the side wall. The longer the time when the slurry reaches the side wall, the greater the influence of gravity and surrounding fluid, and the more changes along the process. (4) When the spraying surface is at the top, the spraying process is significantly affected by gravity, and discontinuous spraying areas will be formed on the top surface. Especially when the initial spraying speed is low, the amount of slurry reaching the top surface fluctuates due to rebound and increases with the increase in the initial spraying speed.

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Degradation Mechanism of Nonaqueous Reactive Polymer Grouting Materials under Chemical Corrosion Environment

Zhang

Fang

et al. 2023

J. Mater. Civ. Eng.

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Research Progress of Rain Erosion of Polyurethane Coating

Cited by 3 publications

References 27 publications

Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry

Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry

Study on Influence Law of Key Factors of New Composite Slurry Spraying Technology

Degradation Mechanism of Nonaqueous Reactive Polymer Grouting Materials under Chemical Corrosion Environment

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