Organic silicon waterproof agent with respiratory function and preparation method thereof
A technology of breathing function and silicone, applied in the field of silicone waterproofing agent and its preparation, can solve the problems of easy blocking of concrete capillary openings, insufficient penetration depth of cement components, and reduced air permeability of waterproofing agent, etc., to achieve excellent breathing performance and improve oil resistance. , the effect of good breathing performance
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Embodiment 1
[0034] A preparation method of an organosilicon waterproofing agent with breathing function, which comprises the steps of:
[0035] ①Mix 120 parts of propyltrimethoxysilane, 20 parts of deionized water, and 360 parts of ethanol in a reaction flask, heat to 56°C, add hydrochloric acid solution (concentration: 0.1mol / L), keep the reaction for 8h;
[0036] ②The pH value of the system was adjusted to 7 by adding sodium hydroxide solution, and the reaction was continued for 2 hours, then the solvent ethanol, water and the alcohol generated by the reaction were distilled off, and then cooled to room temperature to obtain a silicone resin preform with a bulk viscosity of 12000mPa.s. Aggregate, the active ingredient;
[0037] ③ Mix the active component, solvent ethanol and catalyst dibutyltin dilaurate in proportion (the mass ratio of the added ethanol to the active component is 8:1, and the addition amount of dibutyltin dilaurate is 1 / 2 of the mass of the active component 0.2%), t...
Embodiment 2
[0039] Replace 0.1 mol / L hydrochloric acid solution with 0.1 mol / L sodium hydroxide solution, adjust the pH value of the system to 7 with sulfuric acid solution, and other conditions are the same as in Example 1 to obtain propyltrimethoxysilane waterproofing agent. According to JC / T902-2002, the measured water absorption ratio is 7.8%; the waterproofing agent is sprayed on the concrete surface with a water content of 10%, and after 72 hours, the water content of the concrete is 2.2%. After immersing the concrete specimen sprayed with the waterproofing agent in water for 720 hours, the water absorption ratio is calculated to be 13.5% according to JC / T902-2002.
Embodiment 3
[0041] Replace the 0.1mol / L hydrochloric acid solution with 0.1mol / L ammonia solution, adjust the pH value of the system with trifluoroacetic acid solution, replace ethanol with isopropanol, and other conditions are the same as in Example 1 to obtain propyltrimethoxysilane waterproof agent. According to JC / T902-2002, the measured water absorption ratio is 6.4%; the waterproofing agent is sprayed on the concrete surface with a water content of 10%, and after 72 hours, the water content of the concrete is 2.0%. After immersing the concrete specimen sprayed with the waterproofing agent in water for 720 hours, the water absorption ratio is calculated to be 12.1% according to JC / T902-2002.
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