Ether polycarboxylate superplasticizer with rust inhibition function and preparation method thereof
A technology of ether polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, and can solve the problem of complicated steps of anticorrosion functional monomer propylene-benzyldiethylenetriamine monomer, water reducing and slump retention effect of water reducing agent Poor, unsatisfactory stacking effect, etc., to achieve the effect of reducing the cathodic reaction rate, maintaining slump, and improving the effect of rust and corrosion inhibition
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[0038] Example 1
[0039] (1) Preparation of esterified products: by weight, 44.42 parts of methacrylic acid and 50 parts of N-[2-(2-hydroxyethoxy)-4-nitrophenyl]ethanolamine were added to the first reaction vessel Mix, under vacuum, add 1.13 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 , 1.88 parts of 4-tert-butylcatechol, and adjust the reaction temperature to 90 ℃, and react for 5h to obtain the esterified product;
[0040](2) Copolymerization: in parts by weight, first add 6 parts of the esterification product obtained in step (1), 100 parts of allyl polyoxyethylene polyoxypropylene ether with a molecular weight of 1200 and 115 parts of water into the second reaction vessel Mix 2 parts of potassium persulfate and 20 parts of water evenly in the first dropping device; 2 parts of 2-hydroxy-2-sulfinyl acetic acid, 1 part of 3-mercaptopropionic acid and 20 parts of water are mixed evenly In the second dropping device; 5 parts of acrylic acid, 2.5 parts of ...
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[0042] Example 2
[0043] (1) Preparation of esterified products: by weight, 17.27 parts of methacrylic acid and 50 parts of N-[2-(2-hydroxyethoxy)-4-nitrophenyl]ethanolamine were added to the first reaction vessel Mix, under vacuum condition, add 0.34 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 , 0.34 parts of 4-hydroxypiperidinol oxygen radical, and adjust the reaction temperature to 120 ℃, and react for 4h to obtain the esterified product;
[0044] (2) Copolymerization: in parts by weight, first add 3 parts of the esterification product obtained in step (1), 100 parts of molecular weight 2400 methallyl alcohol polyoxyethylene ether and 108 parts of water into the second reaction vessel Stir well, mix 1 part of ammonium persulfate and 20 parts of water in the first dripping device; 1 part of 2-hydroxy-2-sulfinyl acetic acid, 0.5 part of mercaptoethanol and 20 parts of water are evenly mixed in the second drop In the adding device; 8 parts of acrylic aci...
Example Embodiment
[0046] Example 3
[0047] (1) Preparation of esterification product: by weight, add 59.49 parts of acrylic acid and 50 parts of N-[2-(2-hydroxyethoxy)-4-nitrophenyl]ethanolamine into the first reaction vessel and mix, Under the condition of vacuuming, 2.18 parts of supported solid acid catalyst SO42- / SiO2-TiO2, 1.31 parts of 4-hydroxypiperidinol oxygen radical were added, and the reaction temperature was adjusted to 130°C, and the reaction was carried out for 3h to obtain an esterified product;
[0048] (2) Copolymerization: in parts by weight, first add 4.5 parts of the esterification product obtained in step (1), 100 parts of molecular weight 3000 methallyl polyoxyethylene polyoxypropylene ether and 124 parts of water, add the second Stir evenly in the reaction vessel, mix 3 parts of sodium persulfate and 20 parts of water in the first dropping device; 0.5 parts of 2-hydroxy-2-sulfinyl acetic acid, 2.5 parts of trisodium phosphate and 20 parts of water are mixed evenly In t...
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