A kind of preparation method of modified naphthalene series water reducing agent
A naphthalene-based water-reducer and modification technology, which is applied in the field of preparation of water-reducers and modified naphthalene-based water-reducers, can solve problems such as large slump loss and difficult construction, and achieve good effect and strong practicability , the effect of delaying hydration
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0028] (1) Preparation of polycondensation monomer:
[0029] Put 163.3 parts of fumaric acid, 40.4 parts of styrene, 59.1 parts of sodium hypophosphite and 255.5 parts of water into the reactor, and heat it to 60-70°C while stirring; add 65.0 parts of 32% liquid caustic soda to adjust the pH value of the reaction system 5~7; add 210.5 parts of hydroxyethyl acrylate and 6.2 parts of ammonium persulfate to 200 parts of water to make a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer A.
[0030] (2) A modified 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% concentrated sulfuric acid, and sulfonate at 160°C for 3-4 hours;
[0032] (2) Hydrolysis: cool down to 120°C, add 9.7 parts of phosphoric acid and 100 parts of water,...
Embodiment 2
[0036] (1) Preparation of polycondensation monomer:
[0037] Put 148.6 parts of maleic anhydride, 67.1 parts of styrene, 57.0 parts of sodium hypophosphite and 258.2 parts of water into the reaction kettle, and heat to 60-70°C while stirring; add 62.0 parts of 32% liquid alkali to adjust the pH value of the reaction system 5~7; add 200.3 parts of hydroxypropyl acrylate and 6.8 parts of ammonium persulfate to 200 parts of water to form a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer B.
[0038] (2) A modified naphthalene-based water reducer, the preparation steps of which are as follows:
[0039] (1) Sulfonation: Put 128 parts of industrial naphthalene and 46 parts of β-naphthol into the reaction kettle and heat and melt to 130-135°C, add 150 parts of 98% concentrated sulfuric acid, and perform sulfonation reaction at 160°C for 3-4 hours;
[0040] (2) Hydrolysis: cool down to 120°C, add 10.4 parts of phosphoric acid and 10...
Embodiment 3
[0044] (1) Preparation of polycondensation monomer:
[0045] Put 137.5 parts of citraconic acid, 51.8 parts of styrene, 72.4 parts of sodium hypophosphite and 261.4 parts of water into the reaction kettle, and heat to 60-70°C while stirring; add 56.8 parts of 32% liquid caustic soda to adjust the pH value of the reaction system 5~7; add 212.6 parts of hydroxypropyl acrylate and 6.3 parts of potassium persulfate to 200 parts of water to form a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer C.
[0046] (2) A modified 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, an...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More