A modified high-retention naphthalene-based water reducer and its preparation method
A naphthalene-based water-reducing agent and modification technology, which is applied in the preparation of water-reducing agents and modified high-slump naphthalene-based water-reducing agents, can solve the problems of rapid loss of slump over time and achieve high water-reducing rate, It is convenient for transportation and construction, and the effect of simple preparation process
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0028] (1) Preparation of sulfonated hydroxymethylphenol:
[0029] Put 163.8 parts of phenol, 208.8 parts of sodium bisulfite and 266 parts of water into the reaction kettle, and heat to 40-50°C while stirring; add 56.4 parts of 32% liquid caustic soda to adjust the pH value of the reaction system to 8-9; control the temperature Add 305 parts of formaldehyde dropwise. During the dropping process, the dropping speed should be controlled so that the temperature of the system does not exceed 70°C; after the dropping is completed, heat to 80-90°C and react at a constant temperature for 4-5 hours; stop heating, and cool to about 40°C. material, that is, sulfonated hydroxymethylphenol A.
[0030] (2) A modified high-retention naphthalene-based water reducer, the preparation steps of which are as follows:
[0031] (1) Sulfonation: put 138 parts of industrial naphthalene and 28 parts of methylnaphthalene into the reaction kettle and heat and melt to 130-135°C, add 145 parts of 98% co...
Embodiment 2
[0036] (1) Preparation of sulfonated hydroxymethylphenol:
[0037] Put 160.8 parts of phenol, 226.7 parts of sodium sulfite and 299 parts of water into the reaction kettle, and heat it to 40-50°C while stirring; add 313.5 parts of formaldehyde dropwise under temperature control, and the dropping speed should be controlled during the dropping process so that the temperature of the system does not exceed 70 °C; after the dropwise addition, heat to 80-90 °C and react at a constant temperature for 4-5 hours; stop heating, cool to about 40 °C and discharge to obtain sulfonated hydroxymethylphenol B.
[0038] (2) A modified high-retention naphthalene-based water reducer, the preparation steps of which are as follows:
[0039] (1) Sulfonation: put 138 parts of industrial naphthalene and 28 parts of methylnaphthalene into the reaction kettle and heat and melt to 130-135°C, add 145 parts of 98% concentrated sulfuric acid, and sulfonate at 160°C for 3-4 hours;
[0040] (2) Hydrolysis: ...
Embodiment 3
[0044] (1) Preparation of sulfonated hydroxymethylphenol:
[0045] With the preparation method of sulfonated hydroxymethylphenol in embodiment 1.
[0046] (2) A modified high-retention naphthalene-based water reducer, the preparation steps of which are as follows:
[0047] (1) Sulfonation: Put 162 parts of industrial naphthalene into the reaction kettle and heat and melt to 130-135°C, add 163.7 parts of 98% concentrated sulfuric acid, and perform sulfonation reaction at 160°C for 3-4 hours;
[0048] (2) Hydrolysis: cool down to 120°C, add 8.2 parts of phosphoric acid and 100 parts of water, and hydrolyze for 1-2 hours;
[0049] (3) Condensation: Cool down to 95°C, add 10.5 parts of sulfonated hydroxymethylphenol A and 5.7 parts of 1-amino-2-hydroxy-4-naphthalenesulfonic acid, then add 118 parts of formaldehyde, and perform condensation at 100-105°C Reaction 3~4h;
[0050] (4) Neutralization: the aforementioned condensation material is transferred to a neutralization tank an...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More