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A platform for research: civil engineering, architecture and urbanism
Modified melamine water reducer and preparation method thereof
The invention relates to the field of concrete admixture and discloses a modified melamine water reducer and a preparation method thereof. An organic long chain is introduced to a molecular terminal position of the modified melamine water reducer, the mole ratio of a long-chain raw material to formaldehyde is 1:1 during synthesis of the organic long chain, and the mole ratio of melamine to formaldehyde to sodium hydrogen sulfite to a terminal-group long chain is 1: (3.5-3.8): (1.5-2.0): (0.03-0.05). The invention further discloses the preparation method of the modified melamine water reducer. The preparation method comprises steps as follows: synthesizing the terminal-group long chain; adding formaldehyde and sodium hydrogen sulfite for hydroxymethylation and sulfonation reactions of melamine; performing a condensation polymerization reaction under the acidic condition; adding alkali for reforming and weak bond fission of polymer molecules, and removing formaldehyde residues. A water reducer molecule main chain is introduced to a terminal position of the long chain through a condensation reaction of hydroxyl groups in a solution, space steric hindrance is added to a dispersion system, the repulsive interaction among cement particles is further improved, and the water reducing effect is further improved.
Modified melamine water reducer and preparation method thereof
The invention relates to the field of concrete admixture and discloses a modified melamine water reducer and a preparation method thereof. An organic long chain is introduced to a molecular terminal position of the modified melamine water reducer, the mole ratio of a long-chain raw material to formaldehyde is 1:1 during synthesis of the organic long chain, and the mole ratio of melamine to formaldehyde to sodium hydrogen sulfite to a terminal-group long chain is 1: (3.5-3.8): (1.5-2.0): (0.03-0.05). The invention further discloses the preparation method of the modified melamine water reducer. The preparation method comprises steps as follows: synthesizing the terminal-group long chain; adding formaldehyde and sodium hydrogen sulfite for hydroxymethylation and sulfonation reactions of melamine; performing a condensation polymerization reaction under the acidic condition; adding alkali for reforming and weak bond fission of polymer molecules, and removing formaldehyde residues. A water reducer molecule main chain is introduced to a terminal position of the long chain through a condensation reaction of hydroxyl groups in a solution, space steric hindrance is added to a dispersion system, the repulsive interaction among cement particles is further improved, and the water reducing effect is further improved.
Modified melamine water reducer and preparation method thereof
TAO JUAN (author) / CHEN YI (author) / MAO RONGLIANG (author) / XU RUYUAN (author)
2015-07-22
Patent
Electronic Resource
English
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