CN115109445A - Steel bar coating material suitable for chloride environment and preparation method thereof - Google Patents
Steel bar coating material suitable for chloride environment and preparation method thereof Download PDFInfo
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- CN115109445A CN115109445A CN202210814565.8A CN202210814565A CN115109445A CN 115109445 A CN115109445 A CN 115109445A CN 202210814565 A CN202210814565 A CN 202210814565A CN 115109445 A CN115109445 A CN 115109445A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
- C08F218/02—Esters of monocarboxylic acids
- C08F218/04—Vinyl esters
- C08F218/08—Vinyl acetate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a steel bar coating material suitable for a chloride environment and a preparation method thereof, wherein the steel bar rust-resisting coating is mainly suitable for preventing steel bars in the chloride environment from rusting, and comprises the following components in parts by weight: 50-70 parts; ethylene acetate-ethylene copolymer emulsion redispersible rubber powder: 10-20 parts; water: 20-40 parts. The rust-resistant coating material can be used at a low temperature (0 ℃), can solve the problems of reinforcement corrosion, spalling and the like caused by corrosion of chloride salt to reinforced concrete in a service process in a saline-alkali environment, can obviously improve the reinforcement corrosion resistance in the reinforced concrete, prevent the concrete from bulging, spalling and uneven appearance caused by reinforcement corrosion, and prolong the service life of buildings in the saline-alkali environment.
Description
Technical Field
The invention relates to a steel bar coating material suitable for a chloride corrosion environment and a preparation method thereof, belonging to the field of steel bar anti-corrosion materials.
Background
In China, vast members exist, a large amount of corrosive ionic chloride exists in soil or water in many areas, and under the environment, after a reinforced concrete structure runs for several years, reinforcement rust in concrete begins to rust, and a building is damaged early due to the reinforcement rust in a corrosive environment, so that the problem which is generally concerned and is increasingly prominent in the engineering field is solved.
In fact, the corrosion damage of the steel bar in the concrete has become a worldwide problem, and the corrosion of the steel bar is ranked first among the factors influencing the durability of the concrete at the international conference on the durability of the concrete.
Therefore, aiming at the reinforced concrete in the saline-alkali environment at present, a lot of work is needed to be done on how to prevent the reinforcing steel bars in the concrete from rusting.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a steel bar rust-resistant coating material and a preparation method thereof, which solve the problems of steel bar corrosion, expansion crack and the like caused by corrosion of chloride ions in the service process of reinforced concrete in a saline-alkali environment, can obviously improve the steel bar corrosion resistance of the reinforced concrete, prevent the concrete from swelling due to the corrosion of the steel bar, and prolong the service life of a building.
The technical scheme is as follows:
the invention provides a steel bar rust-resisting coating material which comprises the following components in parts by mass:
slag portland cement: 50-70 parts of a solvent;
vinyl acetate-ethylene copolymer emulsion redispersible rubber powder: 10-20 parts;
water: 20-40 parts.
In some embodiments, the slag portland cement is one or a mixture of two of P · S · B42.5 or P · S · B52.5.
In some embodiments, the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion is prepared by the following raw materials in parts by weight according to a certain process sequence:
polyvinyl alcohol: 3-5 parts;
emulsifier OP-10: 0.3-0.7 part;
ammonium persulfate: 0.1-0.2 parts;
vinyl acetate: 25-35 parts;
sodium bicarbonate: 0.05-0.1 part;
vinyl versatate: 10-15 parts;
butyl acrylate: 1-5 parts;
ethyl acrylate: 1-4 parts;
antifoam silicone 691: 0.05-0.15 part;
water: 40-50 parts.
More preferably, the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following components in parts by weight:
polyvinyl alcohol: 3-4 parts;
emulsifier OP-10: 0.4-0.6 part;
ammonium persulfate: 0.1-0.15 parts;
vinyl acetate: 30-35 parts of a solvent;
sodium bicarbonate: 0.06-0.08 parts;
vinyl versatate: 11-13 parts;
butyl acrylate: 1-3 parts;
ethyl acrylate: 1-3 parts;
antifoam silicone 691: 0.05-0.1 part;
water: 43-57 parts.
The preparation method of the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
step 1) weighing polyvinyl alcohol required by a formula, dissolving the polyvinyl alcohol in water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 85-90 ℃, and preserving heat to dissolve for 1-2 hours;
after fully dissolving, cooling to 74-76 ℃, adding an emulsifier OP-10, uniformly mixing, adding an aqueous solution of ammonium persulfate with the formula amount of 50%, and then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, wherein the temperature of the solution is controlled between 74-80 ℃;
step 3), after the monomer is dripped, adding the rest 50% aqueous solution of ammonium persulfate, and finishing adding the aqueous solution of ammonium persulfate within 30 min;
step 4), raising the temperature of the solution to 85-90 ℃, continuously stirring for 1-1.5 h, and adjusting the pH value of the emulsion to 6.8-7.2 by using an aqueous sodium bicarbonate solution when the temperature is reduced to 30-40 ℃;
step 5) filtering the emulsion prepared in the step 4) by using a sieve with the mesh size of 0.08mm to obtain the prepared vinyl acetate-ethylene copolymer emulsion;
and 6) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion at the temperature of 255-265 ℃ to obtain the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion.
Preferably, in the step 2), butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers are dropwise added uniformly within 4-5 h.
Preferably, in step 4), the pH of the emulsion is adjusted to 7.
Preferably, in step 6), the spray drying is carried out at 260 ℃.
On the other hand, the invention also provides a preparation method of the steel bar rust-resisting coating material, which comprises the following steps:
a. firstly, controlling the temperature of water to be 30-40 ℃;
b. adding the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into the water obtained in the step a, and cooling to 20-25 ℃ after the redispersible rubber powder is fully dissolved;
c. and c, adding the slag portland cement in the formula into the solution prepared in the step b, and uniformly mixing to obtain the cement.
The prepared steel bar rust-resisting coating material is used up within 2 hours after the preparation is finished.
The invention has the beneficial effects that: the rust-resistant coating material is mainly applied to reinforced concrete buildings constructed in a saline-alkali environment, mainly solves the problems of reinforcement corrosion, expansion crack and the like caused by corrosion of chloride ions in the service process of reinforced concrete in the saline-alkali environment, and can obviously improve the reinforcement corrosion resistance in the reinforced concrete.
Drawings
FIG. 1 is a drawing of the formation of coated steel bars in the example;
FIG. 2 is a graph showing a dry-wet cycle test in the examples;
FIG. 3 is a comparison of the corrosion of the steel bars in the examples.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
For the purposes of the present specification and appended claims, unless otherwise indicated, all numbers expressing quantities, percentages or proportions, and other numerical values used in the specification and appended claims, are to be understood as being modified in all instances by the term "about". Moreover, all ranges disclosed herein are inclusive of the endpoints and independently combinable.
The implementation method of the steel bar coating material suitable for the chloride environment comprises the following steps:
example 1:
1. according to the mass ratio of 4: 0.4: 0.1: 31: 0.06: 12: 2: 1: 0.06: 49.38 ═ polyvinyl alcohol: emulsifier OP-10: ammonium persulfate: vinyl acetate: sodium bicarbonate: vinyl versatate: butyl acrylate: ethyl acrylate: antifoam silicone 691: water, weighing a certain amount of raw materials.
2. The process for preparing the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
1) weighing polyvinyl alcohol required by the formula, dissolving the polyvinyl alcohol in 10 times of water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 85 ℃, and preserving heat to dissolve for 1.5 h.
2) After the mixture is fully dissolved, cooling to 75 ℃, adding an emulsifier OP-10, stirring for 10min, adding an ammonium persulfate solution with the formula amount of 50%, then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, controlling the monomer addition to be uniformly completed within 4.5h, and controlling the solution temperature to be 80 ℃;
3) after the monomer is added, slowly adding the rest 50% ammonium persulfate aqueous solution, and adding the ammonium persulfate solution completely within 25 min;
4) raising the temperature of the solution to 85 ℃, continuously stirring for 1h, and regulating the pH value of the emulsion to 7 by using a sodium bicarbonate aqueous solution when the temperature is reduced to 30 ℃;
5) filtering with a sieve mesh diameter of 0.08mm, and barreling for later use;
6) and (3) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion, and keeping the temperature of an atomization dryer at 260 ℃ to finish the atomization drying.
3. According to the mass ratio of 60: 20: 20' of the cement, the redispersible rubber powder of Portland cement slag, vinyl acetate-ethylene copolymer emulsion and water are weighed.
4. Adjusting the temperature of water to 35 ℃; slowly putting the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into water, continuously stirring, and cooling to 20 ℃ after fully dissolving; adding the cement in the formula, and continuously stirring uniformly to obtain the steel bar rust-resisting coating material.
Example 2:
1. according to the mass ratio of 5: 0.5: 0.15: 30: 0.08: 14: 3: 1: 0.09: 46.18 ═ polyvinyl alcohol: emulsifier OP-10: ammonium persulfate: vinyl acetate: sodium bicarbonate: vinyl versatate: butyl acrylate: ethyl acrylate: antifoam silicone 691: water, weighing a certain amount of raw materials.
2. The process for preparing the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
1) weighing polyvinyl alcohol required by the formula, dissolving the polyvinyl alcohol in 10 times of water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 86 ℃, and preserving heat to dissolve for 2 hours.
2) After the mixture is fully dissolved, cooling to 75 ℃, adding an emulsifier OP-10, stirring for 10min, adding an ammonium persulfate solution with the formula amount of 50%, then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, controlling the monomers to be uniformly added within 4h, and controlling the temperature of the solution to be 75 ℃;
3) after the monomer is dropwise added, slowly adding the rest 50% ammonium persulfate aqueous solution, and completely adding the ammonium persulfate solution within 20 min;
4) the temperature of the solution is raised to 85 ℃, the solution is continuously stirred for 1 hour, and when the temperature is lowered to 30 ℃, the pH value of the emulsion is adjusted to 7 by using a sodium bicarbonate aqueous solution;
5) filtering with a sieve mesh diameter of 0.08mm, and barreling for later use;
6) and (3) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion, and keeping the temperature of an atomization dryer at 260 ℃ to finish the atomization drying.
3. According to the mass ratio of 65: 15: 20' of the cement, the redispersible rubber powder of Portland cement slag, vinyl acetate-ethylene copolymer emulsion and water are weighed.
4. Adjusting the temperature of water to 35 ℃; slowly putting the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into water, continuously stirring, and cooling to 20 ℃ after fully dissolving; adding the cement in the formula, and continuously stirring uniformly to obtain the steel bar rust-resisting coating material.
Example 3:
1. according to the mass ratio of 3: 0.5: 0.15: 32: 0.08: 15: 3: 1: 0.09: 45.18 ═ polyvinyl alcohol: emulsifier OP-10: ammonium persulfate: vinyl acetate: sodium bicarbonate: vinyl versatate: butyl acrylate: ethyl acrylate: antifoam silicone 691: water, weighing a certain amount of raw materials.
2. The process for preparing the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
1) weighing polyvinyl alcohol required by the formula, dissolving the polyvinyl alcohol in 10 times of water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 90 ℃, and preserving heat to dissolve for 2 hours.
2) After the mixture is fully dissolved, cooling to 75 ℃, adding an emulsifier OP-10, stirring for 10min, adding an ammonium persulfate solution with the formula amount of 50%, then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, controlling the monomers to be uniformly added within 4h, and controlling the temperature of the solution to be 75 ℃;
3) after the monomer is added, slowly adding the rest 50% ammonium persulfate aqueous solution, and finishing adding the ammonium persulfate solution within 30 min;
4) the temperature of the solution is raised to 85 ℃, the solution is continuously stirred for 1 hour, and when the temperature is lowered to 30 ℃, the pH value of the emulsion is adjusted to 7 by using a sodium bicarbonate aqueous solution;
5) filtering with a sieve mesh diameter of 0.08mm, and barreling for later use;
6) and (3) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion, and keeping the temperature of an atomization dryer at 260 ℃ to finish the atomization drying.
3. According to the mass ratio of 70: 10: 20' of the cement, the redispersible rubber powder of Portland cement slag, vinyl acetate-ethylene copolymer emulsion and water are weighed according to the proportion of P.S.B 52.5.
4. Adjusting the temperature of water to 35 ℃; slowly putting the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into water, continuously stirring, and cooling to 20 ℃ after fully dissolving; adding the cement in the formula, and continuously stirring uniformly to obtain the steel bar rust-resisting coating material.
Example 4:
1. according to the mass ratio of 4: 0.6: 0.15: 35: 0.08: 15: 3: 2: 0.09: 40.08 ═ polyvinyl alcohol: emulsifier OP-10: ammonium persulfate: vinyl acetate: sodium bicarbonate: vinyl versatate: butyl acrylate: ethyl acrylate: antifoam silicone 691: water, weighing a certain amount of raw materials.
2. The process for preparing the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
1) weighing polyvinyl alcohol required by the formula, dissolving the polyvinyl alcohol in 10 times of water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 90 ℃, and preserving heat to dissolve for 2 hours.
2) After the mixture is fully dissolved, cooling to 75 ℃, adding an emulsifier OP-10, stirring for 10min, adding an ammonium persulfate solution with the formula amount of 50%, then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, controlling the monomers to be uniformly added within 4h, and controlling the temperature of the solution to be 75 ℃;
3) after the monomer is dropwise added, slowly adding the rest 50% ammonium persulfate aqueous solution, and completely adding the ammonium persulfate solution within 30 min;
4) the temperature of the solution is raised to 85 ℃, the solution is continuously stirred for 1 hour, and when the temperature is lowered to 30 ℃, the pH value of the emulsion is adjusted to 7 by using a sodium bicarbonate aqueous solution;
5) filtering with a sieve mesh diameter of 0.08mm, and barreling for later use;
6) and (3) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion, and keeping the temperature of an atomization dryer at 260 ℃ to finish the atomization drying.
3. According to the mass ratio of 55: 15: 30' of the mixture, P.S.B 52.5 slag portland cement, vinyl acetate-ethylene copolymer emulsion re-dispersible rubber powder and water are weighed.
4. Adjusting the temperature of water to 35 ℃; slowly putting the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into water, continuously stirring, and cooling to 20 ℃ after fully dissolving; adding the cement in the formula, and continuously stirring uniformly to obtain the steel bar rust-resisting coating material.
Example 5:
example 5 is essentially the same as example 1, essentially "by mass ratio" 50: 15: 35' of the cement, the P.S.B 52.5 slag portland cement, the vinyl acetate-ethylene copolymer emulsion redispersible rubber powder and water are weighed according to the proportion. Preparing the corrosion-resistant coating material. "the rest of the procedure was the same as in example 1.
Example 6:
example 6 is essentially the same as example 2, essentially "4.5: 0.5: 0.15: 32: 0.08: 14: 3: 1: 0.09: 44.68 ═ polyvinyl alcohol: emulsifier OP-10: ammonium persulfate: vinyl acetate: sodium bicarbonate: vinyl versatate: butyl acrylate: ethyl acrylate: antifoam silicone 691: water, weighing a certain amount of raw materials. "the rest of the procedure was the same as in example 1.
Example 7:
example 7 is essentially the same as example 3, essentially the process for preparing redispersible powders of vinyl acetate-ethylene copolymer emulsions differs somewhat from example 3:
1) weighing polyvinyl alcohol required by the formula, dissolving the polyvinyl alcohol in 10 times of water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 87 ℃, and preserving heat to dissolve for 1 h.
2) After the mixture is fully dissolved, cooling to 75 ℃, adding an emulsifier OP-10, stirring for 10min, adding an ammonium persulfate solution with the formula amount of 50%, then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, controlling the monomer addition to be uniformly completed within 4.5h, and controlling the solution temperature to be 80 ℃;
3) after the monomer is dropwise added, slowly adding the rest 50% ammonium persulfate aqueous solution, and completely adding the ammonium persulfate solution within 20 min;
4) the temperature of the solution is raised to 85 ℃, the solution is continuously stirred for 1 hour, and when the temperature is lowered to 30 ℃, the pH value of the emulsion is adjusted to 7 by using a sodium bicarbonate aqueous solution;
5) filtering with a sieve mesh diameter of 0.08mm, and barreling for later use;
6) and (3) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion, and keeping the temperature of an atomization dryer at 260 ℃ to finish the atomization drying.
The other procedures were the same as in example 3.
Example 8:
example 8 is essentially the same as example 4, with some differences in the process for making the corrosion protection coating from example 4:
adjusting the temperature of water to be 30 ℃; slowly putting the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into water, continuously stirring, and cooling to 25 ℃ after fully dissolving; adding the cement in the formula, and continuously stirring uniformly to obtain the steel bar rust-resisting coating material.
The prepared steel bar rust-resisting coating material is used up within 2 hours after the preparation is finished.
The use method of the steel bar rust-resisting coating material suitable for the chloride environment comprises the following steps:
(1) firstly, removing floating ash and oil stains on the outer surface of the steel bar;
(2) and putting the uniformly stirred steel bar rust-resisting coating material into a spraying container, spraying the steel bar rust-resisting coating material on the outer surface of the steel bar for the first time, spraying for 2 times after the first spraying is finished for 30min, spraying for 3 times after the first spraying is finished for 30min, wherein the spraying thickness is about 1mm, and placing the coated steel bar in a windproof and shady place for curing for 12 hours to be used for a building construction site to perform pouring work of binding the steel bar and concrete.
The effect comparison data and figures are as follows:
the steel bar corrosion resistance comparison test is carried out according to the 13.11 th 'steel bar corrosion rapid test in concrete' in technical Specification for testing concrete for water transportation engineering (JTS/T236-2019). The specific test method is as follows:
respectively coating reinforcing steel bar antirust coating materials with different mixing ratios on HPB235 stainless steel bars with the diameters of 6mm and the lengths of 100mm, and simultaneously taking part of the reinforcing steel bars without coating the reinforcing steel bar antirust coating materials as a reference group;
preparing C30 concrete, pouring a plurality of test pieces of 200mm multiplied by 100mm, and placing reinforcing steel bars in the middle of the test pieces in the pouring process;
after the test piece is molded, placing the test piece at the temperature of (20 +/-5) DEG C, covering the test piece with wet cloth, curing for 24h, then removing the mold, and placing the test piece into a standard curing room for curing to the age of 28 d;
curing the test piece, putting the test piece into an oven at the temperature of (80 +/-2) DEG C, baking for 4 days, cooling, putting the test piece into salt water with the concentration of 3.5 percent, soaking for 24 hours, then putting the test piece into an electric heating blast box, and baking for 13 days at the temperature of (60 +/-2) DEG C;
after the brine is soaked and the drying is finished, the duration is 14d, the cycle is one time, after 4-5 times of cycles, a comparison reference group test piece is split, the corrosion of the steel bar is observed, and the corrosion rate is calculated in week;
the rust accumulation rate calculation method comprises the following steps:
and (3) taking out the steel bars, drawing the corrosion area on the surfaces of the steel bars by using glass paper, copying the corrosion area on the checkered paper, and calculating according to the following formula:
P＝S n /S o ×100％
in the formula, P is the rust deposition rate of the steel bar;
S n corrosion area of reinforcing bars (mm) after n cycles 2 )；
S o Reinforcing bar surface area (mm) 2 )；
The specific test results are indicated in the table below.
TABLE 1 number of wet and dry cycles that the surface of the steel bar begins to rust
Fig. 1 is a forming diagram of a coated steel bar, fig. 2 is a dry-wet cycle test diagram, and fig. 3 is a comparison diagram of corrosion of the steel bar.
As can be seen from fig. 1 to fig. 3 and table 1, the steel bar after being sprayed with the steel bar coating material of the embodiment of the present invention has significantly improved dry-wet cycle times for the steel bar to start rusting and significantly improved dry-wet cycle times for the steel bar when the corrosion rate of the steel bar reaches 15%. The reinforced concrete building constructed in the saline-alkali environment can solve the problems of reinforcement corrosion, expansion crack and the like caused by corrosion of chloride ions in the service process of reinforced concrete in the saline-alkali environment, and can obviously improve the reinforcement corrosion resistance in the reinforced concrete.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The steel bar rust-resisting coating material suitable for the chloride environment is characterized by comprising the following components in parts by weight:
slag portland cement: 50-70 parts of a solvent;
ethylene acetate-ethylene copolymer emulsion redispersible rubber powder: 10-20 parts;
water: 20-40 parts.
2. A reinforcing bar rust inhibiting coating material according to claim 1, wherein the portland slag cement is one or a mixture of two of P-S-B42.5 or P-S-B52.5.
3. The steel bar rust-resisting coating material as claimed in claim 1, wherein the ethylene acetate-ethylene copolymer emulsion redispersible rubber powder is prepared from the following raw materials in parts by weight according to a certain process:
polyvinyl alcohol: 3-5 parts;
emulsifier OP-10: 0.3-0.7 part;
ammonium persulfate: 0.1-0.2 parts;
vinyl acetate: 25-35 parts;
sodium bicarbonate: 0.05-0.1 part;
vinyl versatate: 10-15 parts;
butyl acrylate: 1-5 parts;
ethyl acrylate: 1-4 parts;
antifoam silicone 691: 0.05-0.15 part;
water: 40-50 parts.
4. The steel bar rust-resisting coating material as claimed in claim 1, wherein the ethylene acetate-ethylene copolymer emulsion redispersible rubber powder is prepared from the following raw materials in parts by weight according to a certain process:
polyvinyl alcohol: 3-4 parts;
emulsifier OP-10: 0.4-0.6 part;
ammonium persulfate: 0.1-0.15 parts;
vinyl acetate: 30-35 parts of a solvent;
sodium bicarbonate: 0.06-0.08 parts;
vinyl versatate: 11-13 parts;
butyl acrylate: 1-3 parts;
ethyl acrylate: 1-3 parts;
antifoam silicone 691: 0.05-0.1 part;
water: 43-57 parts.
5. The steel bar rust-resisting coating material as claimed in claim 3 or 4, wherein the preparation method of the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion comprises the following steps:
step 1) weighing polyvinyl alcohol required by a formula, dissolving the polyvinyl alcohol in water in a reaction kettle, adding defoaming agent silicone 691 in the dissolving process, continuously stirring, heating to 85-90 ℃, and preserving heat to dissolve for 1-2 hours;
after fully dissolving, cooling to 74-76 ℃, adding an emulsifier OP-10, uniformly mixing, adding an aqueous solution of ammonium persulfate with the formula amount of 50%, and then dropwise adding butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers, wherein the temperature of the solution is controlled between 74-80 ℃;
step 3), after the monomer is dripped, adding the rest 50% aqueous solution of ammonium persulfate, and finishing adding the aqueous solution of ammonium persulfate within 30 min;
step 4), raising the temperature of the solution to 85-90 ℃, continuously stirring for 1-1.5 h, and adjusting the pH value of the emulsion to 6.8-7.2 by using an aqueous sodium bicarbonate solution when the temperature is reduced to 30-40 ℃;
step 5) filtering the emulsion prepared in the step 4) by using a sieve with the mesh size of 0.08mm to obtain the prepared vinyl acetate-ethylene copolymer emulsion;
and 6) carrying out atomization drying on the prepared vinyl acetate-ethylene copolymer emulsion at the temperature of 255-265 ℃ to obtain the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion.
6. The steel bar rust-resisting coating material as claimed in claim 5, wherein in the step 2), butyl acrylate, ethyl acrylate, vinyl acetate and vinyl versatate monomers are dropwise added and uniformly added within 4-5 h.
7. The rust inhibiting coating material for reinforcing steel according to claim 5, wherein in step 4), the pH of the emulsion is adjusted to 7.
8. The rust inhibiting coating material for reinforcing steel bars according to claim 5, wherein in step 6), the spray drying is performed at 260 ℃.
9. The method for preparing the steel bar rust inhibiting coating material suitable for the chloride environment according to any one of claims 1 to 8, characterized by comprising the following steps:
a. firstly, controlling the temperature of water to be 30-40 ℃;
b. adding the redispersible rubber powder of the vinyl acetate-ethylene copolymer emulsion into the water obtained in the step a, and cooling to 20-25 ℃ after the redispersible rubber powder is fully dissolved;
c. and c, adding slag portland cement in the formula into the solution prepared in the step b, and uniformly mixing to obtain the cement.
10. The steel bar rust-inhibiting coating material prepared by the preparation method according to claim 9, wherein the prepared steel bar rust-inhibiting coating material is used up within 2 hours after the preparation is completed.
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Citations (4)
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|---|---|---|---|---|
| CN101942164A (en) * | 2009-07-05 | 2011-01-12 | 徐永泽 | Multipurpose redispersible emulsion powder and preparation method thereof |
| CN105017823A (en) * | 2015-06-30 | 2015-11-04 | 盐城工学院 | Cement-based concrete reinforcing bar antirust paint, preparation method and application thereof |
| RU2602122C1 (en) * | 2015-07-02 | 2016-11-10 | Фонд Информационного Обеспечения Науки | Powder composition of water re-dispersible paint with microspheres |
| CN111848216A (en) * | 2020-07-28 | 2020-10-30 | 三棵树涂料股份有限公司 | Universal type vinegar, tertiary and propyl copolymer emulsion interface agent and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942164A (en) * | 2009-07-05 | 2011-01-12 | 徐永泽 | Multipurpose redispersible emulsion powder and preparation method thereof |
| CN105017823A (en) * | 2015-06-30 | 2015-11-04 | 盐城工学院 | Cement-based concrete reinforcing bar antirust paint, preparation method and application thereof |
| RU2602122C1 (en) * | 2015-07-02 | 2016-11-10 | Фонд Информационного Обеспечения Науки | Powder composition of water re-dispersible paint with microspheres |
| CN111848216A (en) * | 2020-07-28 | 2020-10-30 | 三棵树涂料股份有限公司 | Universal type vinegar, tertiary and propyl copolymer emulsion interface agent and preparation method thereof |
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