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A platform for research: civil engineering, architecture and urbanism
Synthetic process of modified lignin sulfonate water reducer
The invention discloses a synthetic process of a modified lignin sulfonate water reducer. The method comprises the following steps: 1, adding lignin sulfonate and water in a reactor, heating, adding a catalyst, dropwise adding an oxidant aqueous solution, reacting for 1 h, adding a sulfonating agent and formaldehyde solution, and reacting for 3 h; and 2, adding water and caustic soda to the reactor, adding a sulfonating agent, dropwise adding acetone, reacting for 1 h, adding oxidation modified lignosulfonate solution, dropwise adding formaldehyde solution and reacting for 6 h. The invention has the following advantages: 1, copolymerization of sulfonated acetone and oxidized lignosulfonate has high dispersion efficiency; 2, the water reducer with comb shaped structure has excellent plasticity-maintaining function; 3, sulfonated acetone is used for the first to modify lignosulfonate to reach excellent slump; 4, the effective consumption of water reducer by aluminate minerals in the cement is reduced, and the dispersion efficiency is improved; and 5, the performance defect of abnormal coagulation of cement using gypsum as adjusting admixture caused by lignosulfonate is overcome, and the invention has a wide range of adaptability.
Synthetic process of modified lignin sulfonate water reducer
The invention discloses a synthetic process of a modified lignin sulfonate water reducer. The method comprises the following steps: 1, adding lignin sulfonate and water in a reactor, heating, adding a catalyst, dropwise adding an oxidant aqueous solution, reacting for 1 h, adding a sulfonating agent and formaldehyde solution, and reacting for 3 h; and 2, adding water and caustic soda to the reactor, adding a sulfonating agent, dropwise adding acetone, reacting for 1 h, adding oxidation modified lignosulfonate solution, dropwise adding formaldehyde solution and reacting for 6 h. The invention has the following advantages: 1, copolymerization of sulfonated acetone and oxidized lignosulfonate has high dispersion efficiency; 2, the water reducer with comb shaped structure has excellent plasticity-maintaining function; 3, sulfonated acetone is used for the first to modify lignosulfonate to reach excellent slump; 4, the effective consumption of water reducer by aluminate minerals in the cement is reduced, and the dispersion efficiency is improved; and 5, the performance defect of abnormal coagulation of cement using gypsum as adjusting admixture caused by lignosulfonate is overcome, and the invention has a wide range of adaptability.
Synthetic process of modified lignin sulfonate water reducer
FANG ZHIRONG (author) / DONG GUANG AN (author) / LI WEIKANG (author) / LIU JUN (author)
2015-06-24
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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