Preparation of PUR–EP-containing composite thermal insulation coating for mine and analysis of its thermal insulation efficiency
摘要
With the increasing depth of metal mines in China, heat injury due to high geothermal surrounding rock is a significant issue. This paper studies a new thermal insulation material for mines, a polyurethane foam (PUR) and expanded perlite (EP) composite, aiming to create a safe, comfortable working environment. The composite includes PUR and EP as the main insulation, ceramsite and fly ash as aggregates, and basalt fiber as an admixture. An orthogonal test with three factors—PUR-to-EP mass ratio, ceramsite amount, and basalt fiber amount—was conducted. Samples with varying ratios were tested for insulation efficiency, and results were verified using FLUENT software. The best insulation performance was observed at a PUR-to-EP mass ratio of 0.25:1. Simulation showed that thicker coatings (d = 0.2 m, d = 0.3 m, and d = 0.5 m) provided better insulation. Comparing tunnel temperatures before and after applying the coating at different wind speeds (v = 0.6 m s−1, v = 1.2 m s−1, v = 1.8 m s−1, and v = 2.4 m s−1), a 0.2-m-thick coating reduced outlet air temperatures by 6.8 K, 7.15 K, 7.02 K, and 6.73 K, respectively.