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Corrosion-resistant ether polycarboxylate superplasticizer and preparation method

The technology of ether polycarboxylic acid and water reducing agent is applied in the field of concrete admixtures, which can solve the problems of large amount of functional monomers, complicated operation steps, lack of early strength, etc., and achieves enhanced corrosion inhibition effect, simple process operation and reaction mild effects

Active Publication Date: 2021-04-27
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires two separate preparations of functional monomers to carry out the copolymerization reaction. The operation steps are relatively complicated, and the amount of functional monomers is large, which will lead to high costs. It is relatively lacking in other special functions such as early strength

Method used

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  • Corrosion-resistant ether polycarboxylate superplasticizer and preparation method

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of esterification product: In parts by weight, 106.6 parts of methacrylic acid, 50 parts of trishydroxymethylaminomethane, and 109 parts of N-aminoethyl-3-aminopropyltriethoxysilane were added to the first Mix in the reaction vessel, under vacuum condition, add 2.65 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 , 2.65 parts of 4-hydroxypiperidinol oxygen free radicals, and adjust the reaction temperature to 90°C, and react for 4 hours to obtain the esterified product;

[0037] (2) Copolymerization reaction: by weight, first 3.5 parts of the esterified product obtained in step (1), 100 parts of allyl polyoxyethylene polyoxypropylene ether with a molecular weight of 4000 and 112 parts of water are added to the second reaction Stir evenly in the container, mix 2 parts of ammonium persulfate and 20 parts of water in the first dropping device; mix 1 part of 2-hydroxy-2-sulfinic acid, 1.2 parts of thioglycolic acid and 20 parts of water in th...

Embodiment 2

[0040](1) Preparation of esterification product: In parts by weight, 71.06 parts of methacrylic acid, 50 parts of trishydroxymethylaminomethane, and 109 parts of N-aminoethyl-3-aminopropyltriethoxysilane were added to the first Mix in the reaction vessel, under vacuum conditions, add 1.15 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 , 1.15 parts of 4-tert-butylcatechol, and adjust the reaction temperature to 110°C, and react for 5 hours to obtain the esterified product;

[0041] (2) Copolymerization reaction: in parts by weight, first, 2 parts of the esterification product prepared in step (1), 100 parts of methallyl polyoxyethylene polyoxypropylene ether with a molecular weight of 4000 and 111 parts of water were added to the first Stir evenly in the second reaction vessel, mix 1 part of potassium persulfate and 20 parts of water evenly in the first dropping device; 0.5 parts of 2-hydroxy-2-sulfinic acid disodium salt, 2.5 parts of mercaptoethanol and 20 pa...

Embodiment 3

[0044] (1) Preparation of esterification products: by weight, 148.7 parts of acrylic acid, 50 parts of trishydroxymethylaminomethane, and 109 parts of N-aminoethyl-3-aminopropyltriethoxysilane were added to the first reaction vessel Mixing in medium, under vacuum conditions, add 6.15 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 , 7.69 parts of methyl hydroquinone, and adjust the reaction temperature to 130°C, and react for 3 hours to obtain the esterification product;

[0045] (2) Copolymerization reaction: in parts by weight, first add 5 parts of the esterified product obtained in step (1), 100 parts of methallyl alcohol polyoxyethylene ether with a molecular weight of 4000, and 112 parts of water into the second reaction vessel Stir evenly in the medium, 3 parts of sodium persulfate and 20 parts of water are mixed evenly in the first dropping device; In the second dropping device; 5 parts of acrylic acid, 4 parts of sodium methacrylate, 2 parts of allylth...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to a corrosion-resistant ether polycarboxylate superplasticizer and a preparation method. The corrosion-resistant ether polycarboxylate superplasticizer is prepared from an esterification product, unsaturated polyoxyethylene ether, acrylic acid, unsaturated sulfonate and a rust-inhibiting functional monomer B with double bonds, amino groups and sulfur bonds through copolymerization. The esterification product is prepared from a rust-inhibiting functional monomer A with amino and hydroxyl, a silane monomer and unsaturated acid through an esterification reaction. According to the corrosion-resistant ether polycarboxylate superplasticizer provided by the invention, the corrosion-resistant functional monomer A with amino and hydroxyl, the silane monomer and unsaturated acid are esterified to prepare an esterification product which participate in a copolymerization reaction, so that molecules of the polycarboxylate superplasticizer contain silane groups, amino and hydroxyl, nitrogen atoms in the amino and the hydroxyl can improve the adsorption capacity with the surface of a reinforcing steel bar, meanwhile, amino can be combined with H<+> on the surface of the cathode, the reaction rate of the cathode is reduced, and the corrosion inhibition effect of the reinforcing steel bar is enhanced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an anti-corrosion ether polycarboxylate water reducer and a preparation method. Background technique [0002] In recent years, with the continuous and rapid development of my country's economy, the intensity and scale of my country's infrastructure construction have also continued to increase, and the application of concrete components has also increased. Prestressed high-strength concrete pipe piles have the advantages of short construction period, excellent mechanical properties, high cost performance, and less construction conditions, and solve the problem of traditional piles such as driven prefabricated solid piles, bored piles, and vibrating sinking pipe piles. The disadvantages of the foundation are widely used in engineering foundations such as bridges, ports, and docks. [0003] For offshore buildings and buildings in saline-alkali areas, there are a lot of ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/08C08F220/06C08F228/02C08F226/02C08F216/14C04B24/16C04B103/30C04B103/61
CPCC08F283/065C04B24/165C04B2103/302C04B2103/61C08F230/085C08F220/06C08F228/02C08F226/02C08F216/1475
Inventor 张小芳柯余良郭元强方云辉史艳娜
Owner KZJ NEW MATERIALS GROUP CO LTD