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Curing agent resistant to complex and harmful ion coupling environment and preparation method and application thereof

A technology of curing agent and ions, which is applied in the field of building material additives, can solve the problems of cement expansion, mechanical property decline, unsuitable application, etc., and achieve the effects of strong adsorption capacity, improved mechanical properties, and convenient material selection

Active Publication Date: 2022-06-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some additives have strong curing ability for specific ions, but weak curing ability for other ions. For example, silica-alumina glass body has good curing ability for chloride ions, but weak curing ability for other harmful anions; in addition, some additives such as magnesium oxide etc. will lead to expansion of cement, decrease in mechanical properties, and is not suitable for large-scale engineering applications

Method used

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  • Curing agent resistant to complex and harmful ion coupling environment and preparation method and application thereof
  • Curing agent resistant to complex and harmful ion coupling environment and preparation method and application thereof
  • Curing agent resistant to complex and harmful ion coupling environment and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of a curing agent resistant to complex and harmful ion coupling environment:

[0044] Step 1: After the chloromethylated polystyrene-divinylbenzene is swollen in a mixed solution of absolute ethanol and chloroform for 6 hours, it is stirred with hexamethylenetetramine at a mass ratio of 1:1 at 40 ° C for 6 hours, After the reaction is complete, wash with absolute ethanol to obtain a preliminary exchange resin; add the preliminary exchange resin into concentrated hydrochloric acid (the mass ratio of preliminary exchange resin and hydrochloric acid is 1:12) and stir for 3h, then filter and wash the resin and add strong oxidation Keep PH>14 in the sodium solution, transform the exchange resin for 2h, wash and filter with water to obtain the primary amine exchange resin;

[0045] Step 2: Add the primary amine exchange resin into a 70% trimethylamine solution (the mass ratio of primary amine resin:trimethylamine solution is 1:25), add NaOH solution at th...

Embodiment 2

[0049] A preparation method of a curing agent resistant to complex and harmful ion coupling environment:

[0050] Step 1: After the chloromethylated polystyrene-divinylbenzene is swollen in a mixed solution of absolute ethanol and chloroform for 8 hours, it is stirred with hexamethylenetetramine at a mass ratio of 1:1.2 at 45 ° C for 8 hours, After the reaction is complete, wash with absolute ethanol to obtain a preliminary exchange resin; add the preliminary exchange resin into concentrated hydrochloric acid (the mass ratio of preliminary exchange resin and hydrochloric acid is 1:15) and stir for 5h, then filter and wash the resin and add strong oxidation Keep pH>14 in the sodium solution, transform the exchange resin for 4h, wash and filter with water to obtain the primary amine exchange resin;

[0051] Step 2: Add the primary amine exchange resin into 50% trimethylamine solution (the mass ratio of primary amine resin:trimethylamine solution is 1:30), add NaOH solution at th...

Embodiment 3

[0055] A preparation method of a curing agent resistant to complex and harmful ion coupling environment:

[0056] Step 1: After the chloromethylated polystyrene-divinylbenzene is swollen in a mixed solution of absolute ethanol and chloroform for 7 hours, it is stirred with hexamethylenetetramine at a mass ratio of 1:1.1 at 30 ° C for 7 hours, After the reaction is complete, wash with absolute ethanol to obtain a preliminary exchange resin; add the preliminary exchange resin to concentrated hydrochloric acid (the mass ratio of preliminary exchange resin and hydrochloric acid is 1:14) and stir for 4h, then filter and wash the resin and add strong oxidation Keep PH>14 in the sodium solution, transform the exchange resin for 3h, wash and filter with water to obtain the primary amine exchange resin;

[0057] Step 2: Add the primary amine exchange resin into 65% trimethylamine solution (the mass ratio of primary amine resin:trimethylamine solution is 1:28), add NaOH solution at the ...

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Abstract

The invention provides a preparation method of a curing agent resistant to a complex and harmful ion coupling environment, which comprises the following steps: mixing chloromethylated polystyrene-divinylbenzene and hexamethylenetetramine for reaction, and performing acid washing and strong alkali washing on the product to obtain primary amine exchange resin; the method comprises the following steps: adding primary amine exchange resin into a trimethylamine solution, reacting under a strong alkaline condition, putting a product into a sodium chloride solution, and standing for a period of time to obtain multi-group anion exchange resin; adding the acidified multi-walled carbon nanotubes and multi-group anion exchange resin into water according to a certain mass ratio, and uniformly mixing to obtain a mixed solution; and carrying out high-temperature crystallization treatment on the mixed solution, and then washing and drying to obtain the curing agent resistant to the complex and harmful ion coupling environment. The invention further provides a geopolymer material containing the curing agent resistant to the complex and harmful ion coupling environment, and the geopolymer material can cure various harmful anions and is good in mechanical property, high in ductility and excellent in comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of building material additives, in particular to a curing agent resistant to complex harmful ion coupling environment and a preparation method thereof, and also relates to the application of the curing agent resistant to complex harmful ion coupling environment in building materials. Background technique [0002] Due to the particularity of the sewage environment, the traditional concrete structure is immersed in sewage conditions for a long time, and harmful anions such as chloride ions, sulfate ions, nitrate ions in the sewage environment will enter the concrete through diffusion, penetration and capillary adsorption and reach the surface of the steel bar. , resulting in the deterioration of the concrete matrix and the corrosion of steel bars. Traditional "external defense" protection methods such as cathodic protection, outer covering, etc., have high protection costs, are prone to secondary corrosion, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F8/32C08F212/08C04B12/00
CPCC04B40/0039C08F8/32C04B12/005C08F212/08C04B24/2682C04B14/026Y02W30/91
Inventor 李杉杨哲铭卢亦焱刘真真周伟张号军
Owner WUHAN UNIV
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