Preparation method of modified naphthalene water reducer
A naphthalene-based water-reducer and modification technology, applied in the field of concrete water-reducers, can solve problems such as insufficient performance of naphthalene-based water-reducers, and achieve the effect of solving performance deficiencies
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Embodiment 1
[0028] Add 150 grams of naphthalene and 150 grams of naphthol in a 1000 ml three-necked flask, heat and melt to 120° C. and turn on the stirrer. Then, the temperature was raised to 150°C and 240 grams of 98% concentrated sulfuric acid was evenly added dropwise, and kept at 159-162°C for 2-3 hours under stirring to carry out the sulfonation reaction. After the reaction, cool down to 120°C, add 120 grams of polyethylene glycol 600, and continue the reaction for 3 hours; then add 80ml of water, hydrolyze at 110-120°C for 30 minutes, and then add sulfuric acid to make the total acidity about 30%. Add 30 grams of naphthalene acetic acid and mix well. Then add 190 grams of formaldehyde to condense within 2 hours, during which the temperature is controlled between 110-120°C; (3) After adding formaldehyde, the temperature is controlled between 95-105°C and kept for 2.5 hours, neutralized with alkali to pH =6-9, the liquid product of the modified naphthalene-based water reducer of the...
Embodiment 2
[0030] Other steps are with embodiment 1, and difference only is that used raw material proportioning is 150 grams of naphthalene, 150 grams of naphthols, 240 grams of vitriol oil, polyethylene glycol 600 90 grams, 45 grams of naphthaleneacetic acid, 195 grams of formaldehyde.
Embodiment 3
[0032] Other steps are with embodiment 1, and difference only is that used raw material proportioning is 150 grams of naphthalene, 150 grams of naphthols, 240 grams of vitriol oil, polyethylene glycol 600 90 grams, naphthalene acetic acid 60 grams, formaldehyde 200 grams.
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