Ammonium salt organic amine early-strength non-alkaline accelerator and preparation method thereof

[0028] Example 1:

[0029] An ammonium salt organic amine early-strength non-alkaline quick-setting agent, composed of 20g water, 10g hydrofluoric acid with a mass fraction (that is, mass percentage, the same hereinafter) of 20%, 7g aluminum hydroxide, 0.25g triethanolamine, two It is made of 0.25g ethanolamine, 40g aluminum sulfate, 18g sodium sulfate, 3g sodium hydroxide aqueous solution with a mass fraction of 30%, 1g amine nitrate, 0.2g copper sulfate, and 0.3g polyacrylamide.

[0030] The specific method for preparing the ammonium salt organic amine early-strength non-alkaline quick-setting agent is: sequentially add 20 g of water and 20% mass fraction of hydrogen fluoride into a 500 ml three-necked or four-necked flask equipped with stirring, heating and cooling devices Acid 10g, aluminum hydroxide 7g, stir and observe the temperature rise, after 10 minutes, raise the temperature to 65-80℃, stir for 20 minutes, add 0.25g triethanolamine and 0.25g diethanolamine, add 40g aluminum sulfate after 10 minutes, stir Adjust the temperature to 65-80°C for 30 minutes. After adding 18g sodium sulfate, the temperature does not rise. Continue stirring to let the temperature drop naturally. After 30 minutes, stir and drop 3g of sodium hydroxide solution with a mass fraction of 30% to adjust the pH; Add 1g of ammonium nitrate after 10 minutes, add 0.2g of copper sulfate after 10 minutes, stir for 30 minutes, add 0.3g of polyacrylamide when the temperature reaches 60℃, and cool to room temperature to obtain ammonium salt organic amine early-strength non-alkaline rate Coagulant.

[0031] The ammonium salt organic amine early-strength non-alkaline accelerator of this embodiment is mixed into mortar concrete. According to actual tests, when the content of the organic amine early-strength non-alkaline accelerator is 6%, the net slurry The initial setting time is 2.3 min, and the final setting time is 7.1 min. The 1d compressive strength of mortar concrete is 10.2MPa, and the 28d compressive strength ratio is 99.1%.

[0032] Example 2:

[0033] An ammonium salt organic amine early-strength non-alkaline accelerator, composed of 16.51g of water, 12g of 20% hydrofluoric acid, 8g of aluminum hydroxide, 0.6g of triethanolamine, 38g of aluminum sulfate, and 19g of sodium sulfate. 4 g of sodium hydroxide aqueous solution with a mass fraction of 30%, 1.3 g of amine nitrate, 0.3 g of copper sulfate, and 0.29 g of polyacrylamide are mixed and prepared.

[0034] The specific method for preparing the ammonium salt organic amine early-strength non-alkaline quick-setting agent is: sequentially adding 12 g of hydrofluoric acid with a mass fraction of 20% into a 500 ml three-necked or four-necked flask equipped with stirring, heating and cooling devices, Add 8g of aluminum hydroxide with stirring, increase the temperature to 65-80°C, add 0.6g of triethanolamine after stirring for 20 minutes, add 38g of aluminum sulfate after stirring for 10 minutes, stir for 30 minutes and adjust the temperature to 65-80°C, add 19g of sodium sulfate, Do not heat up, after stirring for 30 minutes, stir and drop 4g of 40% sodium hydroxide solution to adjust the pH; add 1.3g of amine nitrate after 10 minutes, add 0.3g of copper sulfate after 10 minutes, and stir for 30 minutes. Add 0.29 g of polyacrylamide when the temperature reaches 60°C, and cool to room temperature to obtain an ammonium salt organic amine early-strength non-alkaline accelerator.

[0035] The ammonium salt organic amine early-strength non-alkaline accelerator of this embodiment is mixed into mortar concrete. According to actual tests, when the dosage of the ammonium salt organic amine early-strength non-alkaline accelerator is 6%, The initial setting time of the pure slurry is 2.1min, and the final setting time is 5.5min. The 1d compressive strength of mortar concrete is 8.67MPa, and the 28d compressive strength ratio is 99.6%.

[0036] Example 3:

[0037] An ammonium salt organic amine early-strength non-alkaline accelerator, composed of 19.86g of water, 14g of 20% hydrofluoric acid, 9g of aluminum hydroxide, 0.7g of triethanolamine, 40g of aluminum sulfate, and 10g of sodium sulfate. It is prepared by mixing 4.5 g of 30% sodium hydroxide aqueous solution, 1.4 g of amine nitrate, 0.3 g of copper sulfate, and 0.24 g of polyacrylamide.

[0038] The preparation method is as follows: in a 500ml three-necked or four-necked flask equipped with stirring, condensing and heating devices, the raw materials are sequentially added to water and hydrofluoric acid, then aluminum hydroxide is added, and the organic amine is added after stirring for 20 minutes, and after stirring for 10 minutes Add sulfuric acid, add sodium sulfate, sodium hydroxide solution, amine nitrate, copper sulfate, polyacrylamide after aluminum sulfate is completely dissolved. During the stirring, the temperature of the reactant is controlled at 50-90°C, and the material is stirred for 30 minutes after the addition is completed to obtain the organic amine early-strength non-alkaline accelerator. The ammonium salt organic amine early-strength non-alkaline accelerator of this embodiment is mixed into mortar concrete. According to actual tests, when the dosage of the ammonium salt organic amine early-strength non-alkaline accelerator is 6%, The initial setting time of the pure slurry is 2.2min, and the final setting time is 5.1min. The 1d compressive strength of mortar concrete is 7.03MPa, and the 28d compressive strength ratio is 99.2%.