Sustained-release hydrophobic agent for cement-based material, hydrophobic cement and preparation method thereof
A technology of cement-based materials and hydrophobic agents, applied in the field of slow-release hydrophobic agents, can solve the problems of complex operation and high cost, and achieve the effects of less dosage, improved compactness, and low economic cost
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Embodiment 1
[0028] Add 1 part of fluorosilane and 1 part of alkyl siloxane to 100 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 6 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 60°C, put the floating beads in the soaking solution, soak in a vacuum of 80Kpa for 1d, and then place the floating beads in 6 parts of silica sol for soaking after suction filtration After 4 hours, dry in a drying oven at 60°C for 1 day to obtain modified floating beads.
[0029] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 5% and 10% slow-release hydrophobic agents. The preparation process is as follows:
[0030] Weigh 20 parts of cement and 30 parts of fine sand, add modified floating...
Embodiment 2
[0032]Add 1 part of fluorosilane and 1 part of alkyl siloxane to 50 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 10 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 70°C, put the floating beads in the soaking solution, soak in a vacuum of 100Kpa for 1d, and then place the floating beads in 10 parts of silica sol for soaking after suction filtration 6h, dry in a drying oven at 70°C for 1d to obtain modified floating beads.
[0033] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 15% slow-release hydrophobic agent. The preparation process is as follows:
[0034] Weigh 20 parts of cement and 30 parts of fine sand, and add modified floating beads with a mas...
Embodiment 3
[0036] Add 1 part of fluorosilane and 1 part of alkyl siloxane into 80 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 8 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 60°C, put the floating beads in the soaking solution, soak in a vacuum of 60Kpa for 2d, and then place the floating beads in 8 parts of silica sol for 5 hours after suction filtration , dried in a drying oven at 60°C for 1 day to obtain modified floating beads.
[0037] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 15% slow-release hydrophobic agent. The preparation process is as follows:
[0038] Weigh 20 parts of cement and 30 parts of fine sand, and add modified floating beads with a ...
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