CN115124270B - Layered adsorption type hydrotalcite mortar rust-resistant layer and preparation method and application thereof - Google Patents
Layered adsorption type hydrotalcite mortar rust-resistant layer and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00525—Coating or impregnation materials for metallic surfaces
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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Abstract
The invention relates to the field of reinforcing steel bar rust inhibitors, in particular to a layered adsorption type hydrotalcite mortar rust-resistant layer and a preparation method and application thereof. Firstly, a coprecipitation method is adopted to synthesize a hydrotalcite-loaded rust inhibitor, wherein hydrotalcite is calcium aluminum hydrotalcite, and intercalation rust inhibitor is benzotriazole and vitamin B6. The mortar is coated on the surface of the steel bar layer by layer, and after each layer of mortar is coated, the mortar is made to adsorb hydrotalcite-loaded rust inhibitor with a certain content. The hydrotalcite-loaded rust inhibitor is added into the mortar rust inhibition layer in a layered adsorption mode, so that the problems of poor dispersibility and difficult migration of the hydrotalcite-loaded rust inhibitor in cement-based materials can be well solved, a gradient barrier and gradient chlorine fixation effect with pertinence can be provided, and the point-to-surface rust inhibition advantage is exerted.
Description
Technical Field
The invention relates to the field of reinforcing steel bar rust inhibitors, in particular to a layered adsorption type hydrotalcite mortar rust-resistant layer and a preparation method and application thereof.
Background
The reinforced concrete structure is an indispensable part in various projects, and has the advantages of convenient construction, low cost, long service time and the like. With the increase of the service time of the reinforced concrete structure, the durability problem is gradually developed. Among them, the corrosion of the steel bar caused by the erosion of chloride ions is an important factor for threatening the safety of the concrete structure. The incorporation of rust inhibitors in concrete is a simple and direct measure for preventing the corrosion of reinforcing steel bars. In addition, the coating of epoxy on the surface of the steel bar is a common rust-resistant means.
However, the conventional rust inhibitors still have some problems in the use process: first, in a newly poured reinforced concrete structure, the rust inhibitor is incorporated into the concrete during the mixing stage and uniformly dispersed throughout the structure, and can contact and function with the steel bar only with a small amount of rust inhibitor near the surface of the steel bar, and the rust inhibitor in the remaining area is difficult to naturally migrate to the surface of the steel bar. Secondly, the current rust inhibitor also has the problems of serious prevention, light treatment, passive rust inhibition, environment leakage and the like. For common epoxy resin coatings, the defects of poor bond strength, large interface gaps and the like are caused by the fact that the difference of different matrix components is large, and the problems of poor interface bonding degree between the coating and the steel bar, poor interface bonding degree between the coating and the cement-based material and the like are faced.
In either concrete or organic coatings, the rust inhibiting component is typically homogeneously incorporated into the matrix during the mixing stage, and in this manner, the poorly soluble rust inhibiting component is susceptible to agglomeration and the incorporation mode allows the rust inhibiting component to remain within the point-to-point region, causing some rust inhibiting "loopholes".
In view of the wide application of steel bars in concrete and the hazard of corrosion of the steel bars, how to improve the corrosion resistance technology of the steel bars is still the direction and the focus of the existing research.
Disclosure of Invention
Aiming at the problems of difficult migration, heavy prevention, light treatment, environment escape and the like of the existing rust inhibitor and the short plate with poor compatibility of the epoxy coating and reinforced concrete, the invention aims to provide a layered adsorption type hydrotalcite mortar rust inhibition layer, a preparation method and application thereof, and can play a role in efficiently inhibiting rust of the reinforced concrete.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a layered adsorption type hydrotalcite mortar rust-resistant layer comprises the following steps:
(1) Preparation of hydrotalcite-loaded rust inhibitor:
preparing a hydrotalcite-loaded rust inhibitor by adopting a coprecipitation method, firstly preparing a calcium source and an aluminum source into a salt solution, preparing the rust inhibitor and an alkaline substance into an alkali solution, slowly dripping the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH value of the solution to keep stable in the process, and then aging, washing and drying to prepare the hydrotalcite-loaded rust inhibitor.
(2) Preparing a layered adsorption type hydrotalcite mortar rust-resistant layer:
mixing cement mortar, coating the cement mortar on the surface of the steel bar in the form of a rust-resistant layer, enabling the surface of the mortar to adsorb a layer of hydrotalcite-loaded rust-resistant agent particles after each layer of mortar is coated, and circulating the steps after curing for a certain time. In the mixing process of the mortar, a proper amount of anti-cracking agent, shrinkage reducing agent and water-retaining agent are added simultaneously to keep the state of the mortar rust-resistant layer.
Further, the rust inhibitor in the step (1) is one of benzotriazole and vitamin B6; the calcium source and the aluminum source are Ca (NO) 3 ) 2 ·4H 2 O, and Al (NO) 3 ) 2 ·9H 2 O, wherein the mol ratio of the O to the O is 3:1; the alkali solution comprises a rust inhibitor and NaOH, and the mol ratio of the rust inhibitor to the NaOH is 1:1.
Further, the pH of the solution in the step (1) is controlled to be 9-11, the aging time is 3-5 h, deionized water is used for washing the reaction product until the pH is neutral after the aging, and the hydrotalcite load rust inhibitor is obtained after drying at 50-60 ℃.
Further, the water-cement ratio of the mortar in the step (2) is 0.45-0.55, the lime-sand ratio is 0.4, and the mixing amount of the hydrotalcite-loaded rust inhibitor is 1-6% of the mass of cement; the anticracking agent is hydroxypropyl methyl cellulose with the doping amount of 0.1-0.3%; the shrinkage reducing agent is polyethylene glycol, and the mixing amount is 0.1% -0.3%; the water-retaining agent is maltodextrin, and the mixing amount of the water-retaining agent is 0.3-1%.
Further, the layered adsorption type hydrotalcite mortar rust-resistant layer obtained in the step (2) is coated on the surface of the steel bar by adopting a brush layer-by-layer brushing mode, namely, after each brushing layer, hydrotalcite load rust-resistant agent is sprayed, and after the layered adsorption type hydrotalcite mortar rust-resistant layer is cured for 1-2 hours, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be 1-6 mm.
Compared with the prior art, the invention has the advantages that:
1. as a rust inhibitor material, the invention is different from the traditional rust inhibitor which is doped in the concrete pouring process, and can effectively solve the problems of difficult migration, easy leakage, large addition amount and the like of the rust inhibitor in the concrete by doping the cement mortar rust inhibitor layer.
2. The hydrotalcite-loaded rust inhibitor is doped into the mortar rust inhibition layer in a layered adsorption mode, so that the problem of poor dispersibility of the hydrotalcite-loaded rust inhibitor in cement-based materials can be well solved, the hydrotalcite-loaded rust inhibitor can provide a gradient barrier and a slow-release chlorine inhibition effect with pertinence, and the point-to-surface rust inhibition advantage is exerted.
3. Compared with the common epoxy coating, the mortar rust-resistant layer has better compatibility with the concrete base, and provides better interface bonding state.
4. The hydrotalcite is used for loading the green pollution-free organic rust inhibitor, so that chloride ions in the environment can be adsorbed while the rust inhibitor is effectively and slowly released, and the risk of corrosion of the steel bars is reduced from the source.
Drawings
FIG. 1 is a graph showing open circuit potential values of samples subjected to dry-wet cycle corrosion in this example.
FIG. 2 is a graph showing the rust inhibition efficiency of the test sample after being subjected to dry-wet cycle corrosion in the present example.
Detailed Description
For a better explanation of the present invention, the technical solution of the present invention is further explained below with reference to the drawings and the specific embodiments.
Example 1
Hydrotalcite-loaded benzotriazole rust inhibitor is prepared by adopting a coprecipitation method, and Ca (NO 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 O is prepared into a salt solution, and the ratio of the O to the salt solution is 3:1. Preparing alkali solution by benzotriazole rust inhibitor and NaOH according to a molar ratio of 1:1. Slowly dropping the salt solution into alkali solutionIn the solution, the alkaline solution is strongly stirred and nitrogen is introduced during the titration, the pH of the solution is controlled to be 9 in the process, the aging time is 3 hours, the reaction product is washed to be neutral in pH by deionized water after the aging, and the hydrotalcite-loaded rust inhibitor is obtained after drying at 50 ℃. The consumption of the hydrotalcite-loaded benzotriazole rust inhibitor is 1% of the cement mass, the doping amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.1% of the cement mass, the doping amount of the shrinkage reducing agent polyethylene glycol is 0.1% of the cement mass, and the doping amount of the water-retaining agent maltodextrin is 0.3% of the cement mass. The water-cement ratio was 0.55, and the sand-cement ratio was 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating mortar on the surface of a steel bar in a brush layer by layer brushing mode, namely, spreading hydrotalcite-loaded rust-resisting agent after each brushing layer, and continuing the next brushing and spreading process after curing for 2 hours. The thickness of the mortar rust-resistant layer is controlled to be about 1mm by controlling the brushing times.
Example 2
Hydrotalcite-loaded benzotriazole rust inhibitor is prepared by adopting a coprecipitation method, and Ca (NO 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 O is prepared into a salt solution, and the ratio of the O to the salt solution is 3:1. Preparing alkali solution by benzotriazole rust inhibitor and NaOH according to a molar ratio of 1:1. Slowly dropwise adding the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH of the solution to be 10 in the process, aging for 4 hours, washing the reaction product to be neutral in pH by deionized water after aging, and drying at 55 ℃ to obtain the hydrotalcite-loaded rust inhibitor. The consumption of the hydrotalcite-loaded benzotriazole rust inhibitor is 3% of the cement mass, the doping amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.2%, the doping amount of the shrinkage reducing agent polyethylene glycol is 0.2%, and the doping amount of the water-retaining agent maltodextrin is 0.6%. The water-cement ratio is 0.5, and the cement-sand ratio is 0.4. The stirring speed of the mortar is 20r/min, and the stirring time is 120s. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the layered adsorption type hydrotalcite mortar rust-resisting layer on the surface of a steel bar in a brush layer by layer brushing mode, namely, after each layer of brushing, the layered adsorption type hydrotalcite mortar rust-resisting layer is sprayed with a hydrotalcite load rust-resisting agent, and after the layered adsorption type hydrotalcite mortar rust-resisting layer is cured for 1.5 hours, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is large by controlling the brushing timesControlled at about 3mm.
Example 3
Hydrotalcite-loaded benzotriazole rust inhibitor is prepared by adopting a coprecipitation method, and Ca (NO 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 O is prepared into a salt solution, and the ratio of the O to the salt solution is 3:1. Preparing alkali solution by benzotriazole rust inhibitor and NaOH according to a molar ratio of 1:1. Slowly dropwise adding the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH of the solution to be 11 during the process, aging for 5 hours, washing the reaction product to be neutral in pH by deionized water after aging, and drying at 60 ℃ to obtain the hydrotalcite-loaded rust inhibitor. The consumption of the hydrotalcite-loaded benzotriazole rust inhibitor is 6% of the cement mass, the doping amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.3%, the doping amount of the shrinkage reducing agent polyethylene glycol is 0.3%, and the doping amount of the water-retaining agent maltodextrin is 1%. The water-cement ratio was 0.45, and the sand-cement ratio was 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the layered adsorption type hydrotalcite mortar rust-resisting layer on the surface of a steel bar in a brush layer by layer brushing mode, namely, after each layer of coating, the layered adsorption type hydrotalcite mortar rust-resisting layer is sprayed with a hydrotalcite load rust-resisting agent, and after the layered adsorption type hydrotalcite mortar rust-resisting layer is cured for 1h, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 6mm by controlling the brushing times.
Example 4
The procedure and materials were the same as in example 1 except that the rust inhibitor was replaced with vitamin B6 from benzotriazole, to prepare a hydrotalcite-loaded vitamin B6 rust inhibitor. The consumption of the hydrotalcite-loaded vitamin B6 rust inhibitor is 1% of the cement mass, the doping amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.1%, the doping amount of the shrinkage reducing agent polyethylene glycol is 0.1%, and the doping amount of the water-retaining agent maltodextrin is 0.3%. The water-cement ratio was 0.55, and the sand-cement ratio was 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the layered adsorption type hydrotalcite mortar rust-resisting layer on the surface of a steel bar in a brush layer by layer brushing mode, namely, after each layer of coating, the layered adsorption type hydrotalcite mortar rust-resisting layer is sprayed with a hydrotalcite load rust-resisting agent, and after the layered adsorption type hydrotalcite mortar rust-resisting layer is cured for 2 hours, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 1mm by controlling the brushing times.
Example 5
The procedure and materials were the same as in example 2 except that the rust inhibitor was replaced with vitamin B6 from benzotriazole, to prepare a hydrotalcite-loaded vitamin B6 rust inhibitor. The using amount of the hydrotalcite-loaded vitamin B6 rust inhibitor is 3% of the mass of the cement, and the doping amount of the hydrotalcite-loaded rust inhibitor is 3% of the mass of the cement. The mixing amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.2%, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.2%, and the mixing amount of the water-retaining agent maltodextrin is 0.6%. The water-cement ratio is 0.5, and the cement-sand ratio is 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the layered adsorption type hydrotalcite mortar rust-resisting layer on the surface of a steel bar in a brush layer by layer brushing mode, namely, after each layer of brushing, the layered adsorption type hydrotalcite mortar rust-resisting layer is sprayed with a hydrotalcite load rust-resisting agent, and after the layered adsorption type hydrotalcite mortar rust-resisting layer is cured for 1.5 hours, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 3mm by controlling the brushing times.
Example 6
The procedure and materials were the same as in example 3 except that the rust inhibitor was replaced with vitamin B6 from benzotriazole, to prepare a hydrotalcite-loaded vitamin B6 rust inhibitor. The consumption of the hydrotalcite-loaded vitamin B6 rust inhibitor is 6% of the cement mass, the doping amount of the anti-cracking agent hydroxypropyl methylcellulose is 0.3%, the doping amount of the shrinkage reducing agent polyethylene glycol is 0.3%, and the doping amount of the water-retaining agent maltodextrin is 1%. The water-cement ratio was 0.45, and the sand-cement ratio was 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the layered adsorption type hydrotalcite mortar rust-resisting layer on the surface of a steel bar in a brush layer by layer brushing mode, namely, after each layer of coating, the layered adsorption type hydrotalcite mortar rust-resisting layer is sprayed with a hydrotalcite load rust-resisting agent, and after the layered adsorption type hydrotalcite mortar rust-resisting layer is cured for 1h, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 6mm by controlling the brushing times.
Comparative example 1
In the sample with hydrotalcite-loaded rust inhibitor, the hydrotalcite rust inhibitor is doped into the mortar in the mortar mixing stage, and other steps are consistent with the components and the preparation process of the mortar rust inhibitor layer in the example 2.
Comparative example 2
Epoxy resin coating doped with 3% hydrotalcite-loaded rust inhibitor, the type of hydrotalcite-loaded rust inhibitor is the same as that in example 2, and the thickness of the coating is 3mm.
And (3) evaluating rust resistance:
and pouring the steel bars with the rust-resistant layers coated on the surfaces into mortar test blocks according to the use method of common steel bars, then carrying out dry-wet cycle alternating corrosion test on the test blocks, wherein the sodium chloride concentration of the corrosion solution is 5%, and qualitatively and quantitatively researching the corrosion inhibition capacity by adopting Open Circuit Potential (OCP) Electrochemical Impedance Spectroscopy (EIS). Tests were performed in the experimental manner given above to obtain the open circuit potential (fig. 1) and the rust resistance efficiency (fig. 2), respectively.
From the data of open circuit potential (figure 1) and rust inhibition efficiency (figure 2), the rust inhibition effect of the layered adsorption type hydrotalcite mortar rust inhibition layer is obviously superior to that of the traditional epoxy coating and the mortar rust inhibition layer internally doped with hydrotalcite load rust inhibitor. This is due to the following reasons: (1) The main components of the mortar rust-resistant layer are consistent with the components of the mortar test block, the compatibility problem does not exist, the compatibility between the epoxy coating and the mortar and between the epoxy coating and the steel bar is poor, obvious gaps are formed between the epoxy coating and the steel bar and between the epoxy coating and the mortar after the mortar rust-resistant layer is soaked for a period of time, and a large amount of corrosive solution is permeated, so that the corrosion of the steel bar is accelerated; (2) The hydrotalcite rust inhibitor has good synergistic effect, and can effectively solidify chloride ions in the environment while slowly releasing the rust inhibitor; (3) The hydrotalcite rust inhibitor is added in a spreading and adsorbing mode, so that the problem of agglomeration of the hydrotalcite rust inhibitor in mortar is effectively avoided, and the rust inhibition effect is further improved; (4) By the addition modes of layer-by-layer sprinkling and layered adsorption, a plurality of layers of slow-release chlorine-blocking barriers are formed in the mortar rust-blocking layer, so that the transmission of chloride ions is effectively isolated.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The preparation method of the layered adsorption type hydrotalcite mortar rust-resistant layer is used for corrosion prevention of reinforced concrete and is characterized by comprising the following steps of:
(1) Preparation of hydrotalcite-loaded rust inhibitor:
preparing a hydrotalcite-loaded rust inhibitor by adopting a coprecipitation method, firstly preparing a calcium source and an aluminum source into a salt solution, preparing the rust inhibitor and an alkaline substance into an alkali solution, slowly dripping the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH value of the solution to be stable in the process, and aging, washing and drying to prepare the hydrotalcite-loaded rust inhibitor;
(2) Preparing a layered adsorption type hydrotalcite mortar rust-resistant layer:
mixing cement mortar, coating the cement mortar on the surface of the steel bar in the form of a rust-resistant layer, enabling the surface of the mortar to adsorb a layer of hydrotalcite-loaded rust-resistant agent particles after each layer of mortar is coated, and recycling the steps after curing for a period of time to obtain a layered adsorption type hydrotalcite-based mortar rust-resistant layer; in the mixing process of the mortar, adding an anti-cracking agent, a shrinkage reducing agent and a water-retaining agent simultaneously to keep the state of a rust-resistant layer of the mortar;
the rust inhibitor in the step (1) is one of benzotriazole and vitamin B6;
the mixing amount of the hydrotalcite-loaded rust inhibitor in the step (2) is 1-6% of the mass of cement, and the thickness of the mortar rust inhibition layer is 1-6 mm.
2. The method for preparing the layered adsorption type hydrotalcite mortar rust inhibition layer according to claim 1, wherein the method comprises the following steps: the calcium source and the aluminum source in the step (1) are Ca (NO) 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 O, wherein the ratio of O to O is 3:1; the alkali solution comprises a rust inhibitor and NaOH, and the mol ratio of the rust inhibitor to the NaOH is 1:1.
3. The method for preparing the layered adsorption type hydrotalcite mortar rust inhibition layer according to claim 1, wherein the method comprises the following steps: controlling the pH value of the solution in the step (1) to be 9-11, aging for 3-5 h, washing the reaction product to be neutral by deionized water after aging, and drying at 50-60 ℃ to obtain the hydrotalcite-loaded rust inhibitor.
4. The method for preparing the layered adsorption type hydrotalcite mortar rust inhibition layer according to claim 1, wherein the method comprises the following steps: the cement mortar is stirred in the step (2) with the water-cement ratio of 0.45-0.55, the cement-sand ratio of 0.4, and the anticracking agent is hydroxypropyl methyl cellulose, the mixing amount of which is 0.1-0.3% of the cement mass; the shrinkage reducing agent is polyethylene glycol, and the mixing amount of the shrinkage reducing agent is 0.1-0.3% of the mass of cement; the water-retaining agent is maltodextrin, and the mixing amount of the water-retaining agent is 0.3-1% of the mass of the cement.
5. The method for preparing the layered adsorption type hydrotalcite mortar rust inhibition layer according to claim 1, wherein the method comprises the following steps: the layered adsorption type hydrotalcite mortar rust-resistant layer obtained in the step (2) is formed by coating cement mortar on the surface of the steel bar in a brush layer-by-layer brushing mode, namely, after one layer of cement mortar is brushed, hydrotalcite load rust-resistant agent is sprayed, and after the cement mortar is cured for 1-2 h, the next brushing and spreading process is continued.
6. The utility model provides a layering adsorption type hydrotalcite mortar hinders rust layer which characterized in that: the layered adsorption type hydrotalcite mortar rust-resistant layer is prepared by the method of any one of claims 1 to 5.
7. The use of the layered adsorption type hydrotalcite mortar rust inhibition layer according to claim 6, wherein: and the layered adsorption type hydrotalcite mortar rust-resistant layer is used for corrosion prevention in reinforced concrete.
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| CN107988601A (en) * | 2017-11-29 | 2018-05-04 | 中国科学院海洋研究所 | A kind of hydrotalcite intercalation 5- methyl isophthalic acids, 3,4,-thiadiazoles -2- sulfydryls corrosion inhibitor and its application |
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