Anti-freezing fly ash brick and preparation method thereof
A technology of fly ash bricks and fly ash, applied in chemical instruments and methods, organic chemistry, silicon organic compounds, etc., can solve problems such as inability to use, reduce frost heaving pressure and osmotic pressure, improve frost resistance, The effect of enhancing the gathering ability
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Embodiment 1
[0031] Prepare waterproofing agent:
[0032] Mix methyl methacrylate, butyl acrylate, acrylic acid, dodecafluoroheptyl methacrylate and silicon-containing monomers in a certain proportion to prepare mixed monomers; under nitrogen protection conditions, deionized water and emulsifier Mix, then add mixed monomers and initiators, react at a constant temperature at 80°C for 6 hours, then lower the temperature to 35°C, adjust the pH to 7 with ammonia water, and filter to obtain a waterproofing agent.
[0033] Among them, the silicon-containing monomer is methacryloxypropyl trimethoxysilane; the mixture of methyl methacrylate, butyl acrylate, acrylic acid, dodecafluoroheptyl methacrylate and silicon-containing monomer The dosage mass ratio is 24:6:3:6:1; the emulsifier is one of nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the initiator is ammonium persulfate; deionized water, emulsifier, The mass ratio of mixed monomer and initiator is 2:0.3:10:0.4.
Embodiment 2
[0035] Prepare waterproofing agent:
[0036] Mix methyl methacrylate, butyl acrylate, acrylic acid, dodecafluoroheptyl methacrylate and silicon-containing monomers in a certain proportion to prepare mixed monomers; under nitrogen protection conditions, deionized water and emulsifier Mix, then add mixed monomers and initiators, react at a constant temperature at 80°C for 6 hours, then lower the temperature to 35°C, adjust the pH to 8 with ammonia water, and filter to obtain a waterproofing agent.
[0037] Among them, the silicon-containing monomer is methacryloxypropyl trimethoxysilane; the mixture of methyl methacrylate, butyl acrylate, acrylic acid, dodecafluoroheptyl methacrylate and silicon-containing monomer The dosage mass ratio is 24:6:3:6:1; the emulsifier is one of nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the initiator is ammonium persulfate; deionized water, emulsifier, The mass ratio of mixed monomer and initiator is 2:0.4:10:0.4.
Embodiment 3
[0039] Preparation of additives:
[0040] Step S1. Add dehydroabietic acid into the flask, then add 4-dimethylaminopyridine, and add thionyl chloride dropwise at a temperature of 60°C. After the dropwise addition, raise the temperature to 72°C and continue the reaction 3h, after the reaction was completed, the thionyl chloride was removed by rotary evaporation to obtain intermediate 1;
[0041] Step S2, mix sodium hydroxide and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, then add deionized water, heat up to 60°C and stir to react 50min, then lower the temperature to 20°C, add the acetone solution of intermediate 1, control the pH of the system to 8, and react for 3h. After the reaction, adjust the pH of the obtained reaction solution to 1 with hydrochloric acid, and then Washed with ether, concentrated under reduced pressure to remove the solvent to obtain intermediate 2;
[0042] Step S3, at a temperature of 25°C, mix the obtained intermediate 2 with absolute etha...
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