Preparation method of hydrophilic solvent type polycarboxylate superplasticizer
A technology of hydrophilic solvent and polycarboxylic acid, which is applied in the field of concrete additives, can solve the problems such as the incompatibility between drying efficiency and product performance, and achieve better product performance, excellent slump retention performance, and excellent product performance.
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Embodiment 1
[0026] 1) Mix 6 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, 12 parts of hydroxypropyl acrylate and 2 parts of acrylamide to prepare solution A;
[0027] 2) Mix 10 parts of water, 15 parts of absolute ethanol, 2.5 parts of 3-mercaptopropionic acid, and 1 part of L-ascorbic acid to prepare solution B;
[0028] 3) Mix 200 parts of absolute ethanol, 40 parts of water, and 360 parts of 4-hydroxybutyl vinyl ether until the macromonomer is completely dissolved, and mix with 2 parts of hydrogen peroxide and 4 parts of acrylic acid to prepare solution C;
[0029] 4) Add solution A and solution B dropwise to solution C at the same time, and keep warm at the reaction temperature for 1 hour, wherein the dropping time of solution A is 60 minutes, the dropping time of solution B is 90 minutes, and the reaction temperature is 18°C , to produce a water reducing agent.
Embodiment 2
[0031] 1) Mix 9 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, 10 parts of hydroxypropyl acrylate, 5 parts of dimethylaminoethyl acrylate and 2 parts of N-methylolacrylamide to prepare solution A;
[0032] 2) Mix 10 parts of water, 15 parts of absolute ethanol, 3 parts of 3-mercaptopropionic acid, and 2 parts of L-ascorbic acid to prepare solution B;
[0033] 3) Mix 200 parts of absolute ethanol, 40 parts of water, and 360 parts of 4-hydroxybutyl vinyl ether until the macromonomer is completely dissolved, and mix with 2.5 parts of ammonium persulfate and 4.5 parts of acrylic acid to prepare solution C;
[0034] 4) Add solution A and solution B dropwise to solution C at the same time, and keep warm at the reaction temperature for 1 hour, wherein the dropping time of solution A is 45 minutes; the dropping time of solution B is 60 minutes; the reaction temperature is 15°C , to produce a water reducing agent.
Embodiment 3
[0036] 1) Mix 9 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, 10 parts of hydroxypropyl acrylate, 5 parts of dimethylaminoethyl acrylate and 2 parts of N-methylolacrylamide to prepare solution A;
[0037] 2) Mix 10 parts of water, 15 parts of absolute ethanol, 3 parts of 3-mercaptopropionic acid, and 2 parts of L-ascorbic acid to prepare solution B;
[0038] 3) Mix 150 parts of absolute ethanol, 100 parts of water, and 360 parts of 4-hydroxybutyl vinyl ether until the macromonomer is completely dissolved, and mix with 2.5 parts of potassium persulfate and 4.5 parts of acrylic acid to prepare solution C;
[0039] 4) Add solution A and solution B dropwise to solution C at the same time, and keep warm at the reaction temperature for 1 hour, wherein the dropping time of solution A is 45 minutes; the dropping time of solution B is 60 minutes; the reaction temperature is 15°C , to produce a water reducing agent.
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