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Polycarboxylate-based water-reducing agent with effect of inhibiting corrosion of steel bars and preparation method thereof

A technology of polycarboxylate and steel bar corrosion, which is applied in the field of concrete admixtures in building materials, can solve the problems of unsatisfactory water-reducing effect and anti-rust effect, complex synthesis process, etc., and achieve good product stability and simple preparation process Easy to operate, high water reduction effect

Active Publication Date: 2011-09-07
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention introduces a functional group triazole group in the esterification stage to play the role of rust prevention, but the effect of water reduction and rust prevention is not very ideal, and the synthesis process is relatively complicated, which requires esterification first and then polymerization

Method used

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  • Polycarboxylate-based water-reducing agent with effect of inhibiting corrosion of steel bars and preparation method thereof
  • Polycarboxylate-based water-reducing agent with effect of inhibiting corrosion of steel bars and preparation method thereof
  • Polycarboxylate-based water-reducing agent with effect of inhibiting corrosion of steel bars and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Refer to the following steps to prepare a polycarboxylate water reducer with the function of inhibiting steel corrosion:

[0024] The first step of polymerization reaction: Add 238 parts of water into the reaction kettle, raise the temperature to 60°C, and then add 120 parts of modified polyether with a molecular weight of M=2400, stir to fully dissolve it, and then raise the temperature to a reaction temperature of 90°C ℃, within 4 hours, drop 75 parts of 10% ammonium persulfate aqueous solution, 36 parts of 50% acrylic acid and methacrylic acid aqueous solution (the molar ratio of acrylic acid and methacrylic acid is 4:1), and react at a constant temperature of 90 ℃ After 2 hours, it was naturally cooled to 40°C to obtain a modified ether polycarboxylate water reducer.

[0025] The second step of pH adjustment: under stirring, add 2-diethylaminoethanol, 2-amino-2-methyl-1 - 47 parts of propanol were adjusted for pH value, reacted at 40°C for 40 minutes, and then cool...

Embodiment 2

[0028] Refer to the following steps to prepare a polycarboxylate water reducer with the function of inhibiting steel corrosion:

[0029] The first step of polymerization reaction: Add 231 parts of water into the reaction kettle, raise the temperature to 60°C, and then add 120 parts of modified polyether with a molecular weight of M=2400, stir to fully dissolve it, and raise the temperature to a reaction temperature of 90°C ℃, 75 parts of 10% ammonium persulfate aqueous solution and 32.4 parts of 50% acrylic acid aqueous solution were added dropwise within 4 hours, and reacted at 90℃ for 2 hours, then naturally cooled to 40℃ to obtain modified ether polycarboxylic acid system Water reducing agent.

[0030] The second step of pH value adjustment: under stirring, add 80% of 3-amino-1-propanol and 2-cyclohexylaminoethanol to the modified ether polycarboxylate water reducer obtained in the first step of polymerization reaction. Adjust the pH value of each part, react at 40°C for 4...

Embodiment 3

[0033] Refer to the following steps to prepare a polycarboxylate water reducer with the function of inhibiting steel corrosion:

[0034] The first step of polymerization reaction: add 178 parts of water to the reaction kettle, raise the temperature to 60°C, then put in 100 parts of modified polyether with molecular weight M=2000, stir to make it fully dissolve, then raise the temperature to the reaction temperature of 90°C ℃, within 4 hours, drop 75 parts of 10% ammonium persulfate aqueous solution, 23.7 parts of 50% acrylic acid and methacrylic acid aqueous solution (the molar ratio of acrylic acid and methacrylic acid is 1:1), and react at a constant temperature of 90 ℃ After 2 hours, it was naturally cooled to 40°C to obtain a modified ether polycarboxylate water reducer.

[0035] The second step of pH adjustment: under stirring, add 2-amino-2-methyl-1-propanol, 3-amino - 30 parts of 1-propanol were adjusted for pH value, reacted at 40°C for 40 minutes, and then cooled to ...

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Abstract

The invention discloses a polycarboxylate-based water-reducing agent with an effect of inhibiting corrosion of steel bars and a preparation method thereof, and belongs to the field of concrete additives. The water-reducing agent is prepared based on a modified ether polycarboxylate-based water-reducing agent; and the pH value of the modified ether polycarboxylate-based water-reducing agent is adjusted by use of a preferred alkanolamine organic monomer which has a corrosion-inhibiting effect on steel bars, and then preferred corrosion-inhibiting functional components are compounded. The modified ether polycarboxylate-based water-reducing agent is obtained by free radical induced polymerization of modified polyether and acrylic acid / methyl methacrylate in a water medium. The polycarboxylate-based water-reducing agent which is prepared by the method provided by the invention has the characteristics of high water-reducing rate, low alkali content, good product stability and good capability of inhibiting corrosion of steel bars, is particularly suitable for being used in steel reinforced concrete structures with alkali-aggregate reaction risks and in chloride corrosion environments, and helps improve durability of concrete structures.

Description

technical field [0001] The invention belongs to the field of concrete admixture in building materials. In particular, it relates to a polycarboxylate water reducer with the function of inhibiting the corrosion of steel bars and a preparation method thereof. Background technique [0002] With the continuous development of concrete technology, high-performance concrete has been widely used in important projects in the fields of railways, highways, and water conservancy. In high-performance concrete, adding high-performance water-reducing agent is a simple, economical and effective method to reduce the water-binder ratio, increase the strength of concrete, and improve various properties of concrete. Polycarboxylate superplasticizers have attracted more and more attention from researchers at home and abroad because of their advantages such as low dosage, high water reducing rate, and good slump retention performance. [0003] Usually, steel bars in concrete are in a passivated...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C04B103/30
CPCC04B24/2647C04B40/0039
Inventor 唐修生黄国泓祝烨然高欣欣王冬蔡明陈国新杜志芹刘兴荣温金保王毅
Owner NANJING RUIDI HIGH TECH
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