Improved coal mine polyurethane blocking material and preparation method thereof
A plugging material, polyurethane technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of secondary hazards to the safety of underground workers, insufficient expansion, low expansion multiple, etc., to reduce the cost of synthesis process , Expansion multiple increase, the effect of great compactness
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Example Embodiment
[0021] Example 1
[0022] 1) Dissolve 1g of dimethylolpropionic acid and 0.3g of triethylenediamine in 23.7g of dimethyl methylphosphonate, stir until the system is stable, and there is no precipitate.
[0023] 2) Add 25 g of polyether 403 to the solution obtained in step 1), stir until the solution is clear without any floccules and granular substances, and use this solution as component A.
[0024] 3) Use 50 g of diphenylmethane diisocyanate as component B. During use, the components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.
[0025] The consolidation time of the obtained polyurethane plugging material is 80s, the expansion ratio is 3.5, and the compressive strength is 59MPa.
Example Embodiment
[0026] Example 2
[0027] 4) Dissolve 1.25 g of dimethylolpropionic acid and 0.3 g of triethylene diamine in 20 g of dimethyl methylphosphonate, and stir until the system is stable and there is no precipitate.
[0028] 5) Add 33.45g of polyether 403 to the solution obtained in step 1), stir until the solution is clear without any floccules and granular substances, and use this solution as component A.
[0029] 6) Use 45 g of diphenylmethane diisocyanate as component B. During use, the components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.
[0030] The consolidation time of the obtained polyurethane plugging material is 100s, the expansion ratio is 2.2, and the compressive strength is 55MPa.
Example Embodiment
[0031] Example 3
[0032] 7) Dissolve 0.75g of dimethylolpropionic acid and 0.3g of triethylenediamine in 28.95g of dimethyl methylphosphonate, and stir until the system is stable and there is no precipitate.
[0033] 8) Add 30 g of polyether 403 to the solution obtained in step 1), stir until the solution is clear without any floccules and particulate matter, and use this solution as component A.
[0034] 9) Use 40 g of diphenylmethane diisocyanate as component B. During use, the components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.
[0035] The consolidation time of the obtained polyurethane plugging material is 61s, the expansion ratio is 4.0, and the compressive strength is 52MPa.
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