CN113861777A - Silicate concrete anticorrosive paint - Google Patents
Silicate concrete anticorrosive paint Download PDFInfo
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- CN113861777A CN113861777A CN202111193522.4A CN202111193522A CN113861777A CN 113861777 A CN113861777 A CN 113861777A CN 202111193522 A CN202111193522 A CN 202111193522A CN 113861777 A CN113861777 A CN 113861777A
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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
- C09D133/00—Coating compositions based on homopolymers or 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- 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
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Abstract
The invention belongs to the field of coatings, and relates to a silicate concrete anticorrosive coating which comprises the following components in percentage by weight: 30-40% of water-based organic silicon modified acrylic resin, 10-20% of silicon dioxide, 2-8% of graphene, 5-10% of crystalline flake basalt and the balance of water. The invention utilizes the water-based organic silicon modified acrylic acid base material and the nano-filler to form a permeable compact coating, thereby hindering the diffusion of corrosive media into the concrete and improving the durability of the concrete.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to an anticorrosive coating for improving the durability of silicate concrete.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The silicate concrete has the advantages of rich raw materials, simple manufacture, low cost and continuously increased use amount. It is not only the most common building material in the building industry, but also an important material in the engineering of shipbuilding, ocean development, mechanical industry and the like. However, concrete is a porous material, and countless pores and microcracks exist throughout its structure. Corrosive media such as acid, alkali, salt and the like in the service environment easily enter tiny pores on the surface of the concrete, corrode concrete bonding materials, aggregates, reinforcing steel bars and the like, reduce the durability of the concrete and influence the service life of the concrete. The american learner Sitter uses the five-fold law to figure out the economic loss caused by insufficient concrete durability due to the consideration of the lack of time or improper measures, i.e., if the necessary measures for protecting the steel bars are less than $ 1 in the design stage, the measures taken when the steel bars are found to be corroded will add $ 5 in maintenance cost, and the measures taken when the concrete is cracked will add $ 25 in maintenance cost, and the measures taken when the concrete is seriously damaged will add $ 125 in maintenance cost. Therefore, the durability of concrete is a dual requirement for engineering safety and economy.
The first problem of improving the durability of concrete is to prevent the stressed main reinforcement from being corroded. Now lead to steelThe main factors of the corrosion of the reinforcement are two, namely the carbonization of a concrete protective layer and the corrosion of chloride ions. The carbonization reaction is CO in air2And Ca (OH) in concrete2Reaction to produce CaCO3As shown in formulas (1) and (2). Along with the progress of concrete carbonization, the alkalinity of concrete gradually disappears, and the hydrogen ion content in the concrete pore solution increases, so that the passive film on the surface of the reinforcing steel bar is damaged, and the protective effect on the reinforcing steel bar is lost.
Ca(OH)2+CO2→CaCO3+H2O (1)
CaO·SiO2·nH2O+CO2→SiO2·nH2O+CaCO3 (2)
The corrosion action of the chloride ions is that the chloride ions permeate into the concrete along with substances such as water and the like to remove Fe2+Oxidation to Fe3+The reaction is shown in formulas (3) to (6). In the corrosion process of chloride ions, the passive film on the surface of the steel bar is gradually damaged, and the steel bar slowly corrodes and rusts to reduce the safety of the component.
Fe→Fe2++2e- (3)
Fe2++2Cl-→FeCl2(4)
FeCl2+H2O+OH-→Fe(OH)2+H++2Cl- (5)
2Fe+1.5O2+H2O→2FeO(OH)(6)
Carbonization reactions and chloride ion attack of concrete are two major factors affecting the durability of concrete. And the micro-pore canal on the surface of the concrete provides favorable conditions for concrete carbonization and chloride ion corrosion. Therefore, the coating is coated on the surface of the concrete to form a layer of compact protective film which can seal surface pore channels and block the corrosion of corrosive ions, thereby improving the durability of the concrete. This is currently the most cost effective and widely used method for protecting concrete. The surface coating paint for improving the durability of concrete needs to have the following properties of good permeability, alkali resistance, flexibility, ductility and thickness of the paint, good adhesion, wear resistance and the like. The materials satisfying the above properties are mainly epoxy resins, ethylenes, chlorinated rubbers, polyurethanes, asphalts, and the like.
The solid phase is formed by mixing cement, fly ash, silica fume and limestone powder, and the liquid phase is formed by mixing a polycarboxylic acid water reducing agent and water. Compared with a blank test piece of C30 common silicate concrete, the carbonization depth of the test piece 28d coated with the coating is reduced by 65.48% -67.01%. This is because the coating itself has a relatively low content of Ca (OH)2Reduce CO and2probability of carbonization occurring, while the dense structure of the coating prevents CO2With further carbonization of the concrete. The diffusion depth of the chloride ions is also obviously reduced, and the reduction amplitude is 14.05-25.09%. The paint is essentially a cement paint, and Ca (OH) after cement hydration is reduced by utilizing low water cement ratio2Content, and simultaneously, finely divided admixtures of mineral such as wollastonite powder and Ca (OH)2The pozzolanic reaction takes place, consuming a large amount of Ca (OH) as well2Meanwhile, the gel product is added, so that the crystallization of hydrate is disturbed, the size of the hydrate crystal particles is promoted to be reduced, the structure is more compact, and the invasion of corrosive media is prevented, so that the durability is improved. Because the coating belongs to a cement system, the carbonization resistance is lower than 70%, the chloride ion permeation resistance is lower than 26%, the durability improvement effect is not obvious, and the large-scale application of concrete (such as saline-alkali soil) in a heavy corrosion area is not facilitated. Moreover, the solid-liquid two-component system needs to be prepared on site, so that the site construction efficiency is reduced.
Researchers have proposed a concrete anticorrosive paint of infiltration consolidation type. The infiltration solidification type epoxy-based concrete anticorrosive paint is A, B two-component paint. The component A comprises 30-60% of bisphenol A epoxy resin E-44, 25-35% of furfural, 10-30% of acetone and 0-5% of an auxiliary agent A by mass percent. The component B comprises, by mass, 5-20% of diethylenetriamine DETA, 0-4% of 2,4, 6-tri (dimethylaminomethyl) phenol DMP-30 and 0-5% of an auxiliary agent B. The ion permeation resistance comparison is carried out by taking C30 common concrete as a comparison sample, and the result shows that the electric flux of the common concrete is about 3400C, and the electric flux of the concrete after the epoxy paint is coated is greatly reduced to 130C. The ion penetration resistance of the concrete after the epoxy coating is coated is greatly improved. This is because the epoxy coating can not only permeate into the concrete structure, but also effectively seal the pores in the concrete due to the reactivity of the solvent, and prevent the permeation of corrosion factors such as water or chloride ions, thereby improving the corrosion resistance. The coating not only covers the surface of the micropores of the mortar consolidation body, but also permeates into the micropores and completely fills and seals the micropores to form a composite reinforced layer. Most of the common concrete coatings have no permeability and only form a coating on the surface of the concrete. Because the thermal expansion coefficients of the coating and the concrete are different, when the temperature changes, stress concentration is formed on the interface, so that the concrete generates fatigue aging, and the interface is damaged to peel off; on the other hand, the non-infiltration type coating forms a protective layer of several tens to several hundreds of micrometers only on the concrete surface, and once damaged by a corrosion factor, the concrete structure is rapidly corroded. Thus, non-penetrating coatings do not meet the service requirements of a harsh service environment, such as a highly corrosive marine environment. The permeable epoxy coating has extremely high ion permeation resistance and can greatly improve the durability of concrete, but the raw materials such as acetone, phenol and the like used by the coating belong to dangerous chemical articles, and the solvent-based coating has pollution on the environment and does not meet the requirements of the current environmental protection policy of China.
A penetration film-forming type concrete protective coating is also provided. The protective coating is prepared by mixing water-based emulsion serving as a film forming substance (component A) and silica sol serving as a main penetrating component (component B) according to a ratio of 3: 1. The component A comprises the following components in percentage by mass: 0.5-0.65 percent of dispersing agent, 0.10-0.12 percent of hydroxyethyl cellulose ether, 0.25-0.35 percent of defoaming agent, 36-40 percent of silicon micropowder, kaolin, coarse whiting, sericite and the like, 1-2 percent of titanium dioxide, 38-42 percent of aqueous acrylic emulsion, 1.2 percent of film forming additive, 0.15 percent of pH value regulator, 0.15 percent of bactericide, 0.5-0.7 percent of ethylene glycol, 0.67-0.8 percent of thickening agent, 0.4-1.0 percent of color paste and the balance of deionized water. The component B comprises the following components in proportion: 80-90 parts of silica sol, 5-10 parts of potassium silicate, 1-5 parts of sodium polyacrylate and 1 part of silane coupling agent5 to 5 percent of penetrant, 0.5 to 1.0 percent of waterproofing agent and 3 to 10 percent of waterproofing agent. The filler system is rutile titanium dioxide, silicon micropowder, calcined kaolin, coarse whiting and sericite. When the protective coating is not coated, the chloride ion diffusion coefficient of the concrete is 94.5 multiplied by 10-14m2(s) the diffusion coefficient of chloride ion after coating protective paint is 9.6 multiplied by 10-14～12.7×10-14m2The reduction rate is 89.8 to 86.6 percent per second. Indicating that the diffusion coefficient of the chloride ions is greatly reduced after the protective coating is coated. The reason is that the permeable film-forming coating can not only form a layer of protective film on the surface of the concrete, but also can permeate into the concrete, effectively prevent chloride ions from diffusing into the concrete, obviously improve the chloride ion permeability resistance of the concrete and obviously improve the durability of a reinforced concrete structure. For the tested C30 blank group concrete, the 28d carbonization depth was 8.5mm, and the 56d carbonization depth was up to 11.8 mm; the concrete protective coating of the coating sample is brushed, the 28d carbonization depth is 0.9mm, and the 56d carbonization depth is 1.2 mm. The carbonization depth is greatly reduced after the protective coating is coated. The permeable film-forming coating can not only permeate into the concrete, but also form a compact protective film on the surface of the concrete, so that the capability of the concrete for resisting carbon dioxide invasion is improved, and the anti-carbonization performance of the concrete is improved. Although the coating has good durability and environmental protection, the raw materials are various and the preparation process is complex.
The existing concrete protective coating is designed mainly by considering factors such as compatibility of the coating and concrete, environmental adaptability and the like, can improve the durability of the concrete to a certain extent, but still lacks mature industrial application type protective coating with simple production and construction process and high comprehensive performance.
Disclosure of Invention
In order to overcome the problems, the invention aims to provide a silicate concrete anticorrosive paint which is simple to prepare, environment-friendly and high in durability.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a silicate concrete anticorrosive paint, which consists of the following raw materials in percentage by weight: 30-40% of water-based organic silicon modified acrylic resin, 10-20% of silicon dioxide, 2-8% of graphene, 5-10% of crystalline flake basalt and the balance of water.
According to the silicate concrete anticorrosive paint disclosed by the invention, firstly, a penetration type compact coating is formed by utilizing nanoscale silicon dioxide, graphene and microscale crystalline flake basalt, so that the diffusion of a corrosive medium is hindered, and the corrosion resistance of a salt medium is improved. The nano-scale filler particles have high surface energy, high activity and high diffusion capacity, and can be effectively diffused into tiny holes of concrete, so that a permeable protective coating is formed. And secondly, the component affinity of the organic silicon, the silicon dioxide and the basalt with the portland cement is utilized, the binding force of the coating and the portland concrete is improved, and the separation problem of the environment temperature to the binding interface of the coating and the concrete is solved, so that the service life of the coating in different seasons and different areas can be ensured. Thirdly, the organosilicon modified acrylic resin can combine the advantages of the compatibility of organosilicon and portland cement and the weather resistance of acrylic acid, and the best effect of improving the durability of portland concrete can be obtained without increasing the cost. The acrylic acid coating has stronger hydrolytic stability and excellent alkali resistance, is suitable for the surface of concrete, and the acrylic acid latex coating has the function of blocking water and allows water vapor to pass through. After the used filler is added, the coating has excellent permeability on the surface of concrete and good fluidity. The organic silicon coating has good permeability and adhesive force, and the surface of the coated concrete has stronger hydrophobicity. Fourthly, the water-based film forming material is adopted, so that the problem of environmental pollution caused by solvent-based paint can be avoided, and the environment-friendly paint has good environmental performance indexes.
In a second aspect of the invention, a preparation method of a silicate concrete anticorrosive paint is provided, which comprises the following steps:
uniformly mixing the water-based organic silicon modified acrylic resin and water, adding spherical silicon dioxide powder to uniformly disperse the spherical silicon dioxide powder, and adding graphene to uniformly disperse the spherical silicon dioxide powder; finally, adding the flake basalt, and uniformly mixing to prepare the silicate concrete anticorrosive paint.
The third aspect of the invention provides a use method of the silicate concrete anticorrosive paint, and the silicate concrete anticorrosive paint is loaded on the surface of a concrete test piece by brushing or spraying and is cured to obtain the silicate concrete anticorrosive paint.
In a fourth aspect of the invention, the application of the silicate concrete anticorrosive paint in the fields of building, shipbuilding, ocean development and mechanical industry is provided.
The invention has the beneficial effects that:
(1) compared with the prior art, the invention realizes the optimal matching of the coating and silicate concrete by coordinating the components and the structure of the coating, and effectively hinders CO2And chloride ions are diffused, so that the durability of the concrete is greatly improved, the carbonization depth of the coating is 3.8-4.6 mm after 28 days, and the chloride ion permeability coefficient is 6.9 multiplied by 10 after 56 days of coating-14～7.8×10-14m2And/s is reduced by more than 70 percent compared with the uncoated C50 concrete.
(2) The operation method is simple, low in cost, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 results of the durability test of example 1;
FIG. 2 durability test results for example 2;
FIG. 3 durability test results for example 3;
FIG. 4 results of the durability test of example 4;
FIG. 5 results of the durability test of example 5;
fig. 6 results of durability test of example 6.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 30-40% of water-based organic silicon modified acrylic resin, 10-20% of silicon dioxide, 2-8% of graphene, 5-10% of crystalline flake basalt and the balance of water.
In some embodiments, the silica is spherical and has a diameter of 20-50 nm.
In some embodiments, the graphene is a multilayer graphene oxide with a thickness of 3-5 nm.
In some embodiments, the flake basalt has an equivalent diameter of 40-60 microns and a thickness of 1-2 microns.
In some embodiments, the water is deionized water.
In some embodiments, the silicate concrete anticorrosive paint is prepared by weighing the components according to the specified weight percentage, firstly stirring and mixing the water-based organic silicon modified acrylic resin and water by adopting a mechanical stirring method, then adding the spherical silicon dioxide powder, dispersing the spherical silicon dioxide powder by ultrasonic oscillation, then adding the graphene, and continuing the ultrasonic oscillation. Finally, adding the flake basalt, and stirring the mixed solution by using a shear stirrer to prepare the silicate concrete anticorrosive paint.
In some embodiments, the protective coating thickness is 260 μm to 320 μm.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
In the following examples, the aqueous silicone-modified acrylic resin is a commercially available product, domestic AD-1680 aqueous silicone-modified acrylic resin.
Example 1
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 30% of water-based organic silicon modified acrylic resin, 10% of silicon dioxide, 2% of graphene, 5% of crystalline flake basalt and 53% of water.
Wherein, the silicon dioxide is spherical and has a diameter of 20 nanometers.
The graphene is multilayer graphene oxide, and the thickness of the graphene is 3 nanometers.
Wherein, the equivalent diameter of the flake basalt is 40 micrometers, and the thickness of the flake basalt is 1 micrometer.
The preparation method comprises the following steps: weighing the components according to the specified weight percentage, firstly mechanically stirring and mixing the water-based organic silicon modified acrylic resin and water, then adding the spherical silicon dioxide powder, dispersing the spherical silicon dioxide powder through ultrasonic oscillation, then adding the graphene, and continuing the ultrasonic oscillation. Finally, adding the flake basalt, and stirring the mixed solution by using a shear stirrer to prepare the silicate concrete anticorrosive paint. And (3) spraying high paint on the surface of the concrete test piece by using a brush coating or spraying mode, and naturally curing for 30 minutes to obtain a protective coating, wherein the thickness of the protective coating is 260 mu m.
The influence effect of the water-based organic silicon modified acrylic acid coating on the durability of the concrete is evaluated by two indexes of carbonization depth and chloride ion permeability coefficient. The concrete is ordinary C50 silicate concrete. According to GB/T50082-2009 standard of test method for long-term performance and durability of common concrete, carrying out carbonization test and rapid chloride ion migration coefficient method. The carbonization test adopts a prism C50 concrete test block, and the carbonization period is 28 days. Firstly, preparing a C50 concrete prism test block by adopting ordinary portland cement, sand, stones and water according to a ratio, carrying out standard maintenance for 28 days, and then drying for 48 hours at the temperature of 60 ℃. And taking out the dried test piece, placing the test piece in a curing chamber with the temperature of (20 +/-2) DEG C and the relative humidity of (60 +/-5)% and cooling to the normal temperature. And secondly, sealing the surfaces of the dried and cooled test piece by adopting heated paraffin except the left side surface. Parallel lines were then drawn lengthwise on the exposed side with a pencil at 10mm intervals as measurement points for a predetermined carbonization depth. And thirdly, putting the prism test piece on a bracket in a carbonization box, wherein the exposed side surface of the test piece is upward. After the test piece is placed in the carbonization box, the carbonization box is sealed by a mechanical method. The gas convection device in the box is started, and carbon dioxide is slowly charged. The flow of carbon dioxide is gradually adjusted to keep the concentration of carbon dioxide in the tank at (20.0 +/-0.5)%. During the whole test period, the concentration, temperature and humidity of the carbon dioxide are measured every 2h according to the first 2d, and then every 4h, and measures are taken to control the parameters, so that the relative humidity in the box is controlled to be (70 +/-5)% and the temperature is controlled to be within the range of (20 +/-2) ° C. Fourthly, when carbonizing for 28d, taking out the prism test piece, breaking the test piece from one end by a splitting method of a pressure tester or a dry sawing method, cutting off the obtained test piece part, brushing off the powder remained on the section, and spraying a phenolphthalein alcohol solution with the concentration of 1% (1g phenolphthalein is dissolved in 80mL ethanol and 20mL deionized water). After about 30 seconds, measuring the carbonization depth of each point by using a steel plate ruler according to the originally marked measuring point of every 10mm, and testing at least 5 points of each carbonized surface. And fifthly, calculating the average value of the carbonization depths of the 5 measuring points, namely the carbonization depth of the sample.
The fast chloride ion mobility coefficient method uses a cylindrical C50 concrete test block. Firstly, common portland cement, sand, stones and water are proportioned to prepare a cylindrical C50 concrete test block with the diameter of phi 100mm and the height of 50mm, and a test piece is immediately covered by a plastic film after being formed and is moved to a standard curing room. The form was removed at 24 hours and then submerged in a pool of standard curing room for a standard curing period of 56 days. And secondly, taking the test piece out of the maintenance pool, brushing the scraps on the surface of the test piece, and wiping off the redundant moisture on the surface of the test piece. The diameter and the height of the test piece are measured by a vernier caliper, and the measurement is accurate to 0.1 mm. The test piece was placed in a vacuum vessel in a dry state at the saturation surface for vacuum treatment. Reducing the air pressure in the vacuum container to (1-5) kPa within 5min, maintaining the vacuum degree for 3h, and then injecting a saturated calcium hydroxide solution prepared by distilled water into the container under the condition that the vacuum pump is still operated, wherein the solution height is required to ensure that the test piece is immersed. The atmospheric pressure should be restored after the test piece is immersed for 1h, and the immersion should be continued for (18 + -2) h. Thirdly, the test piece is dried by adopting an electric blowing air-cooling air gear, and the surface is clean and has no oil stainSand and lime and water droplets. Then the test piece is loaded into a device of a rapid chloride ion mobility coefficient method, voltage is gradually applied, and current is recorded. The cathode solution is 10% NaCl solution by mass concentration, and the anode solution is 0.3mol/L NaOH solution by mol concentration. And fourthly, taking the test piece out of the experimental device after the power supply is cut off, immediately washing the surface of the test piece by using tap water, and wiping off redundant moisture on the surface of the test piece. Then, the sample is split into two semi-cylinders along the axial direction on a pressure tester, and AgNO with the concentration of 0.1mol/L is sprayed on the surface of the split sample immediately3After the solution is sprayed with the indicator for about 15min, the indicator is divided into 10 equal parts along the diameter section of the test piece, and a penetration contour line is drawn by a waterproof pen. According to the observed obvious color change, the distance between the color development boundary and the bottom surface of the test piece is measured, namely the penetration depth X of the chloride ionsd. Unsteady state chloride ion diffusion coefficient D of concreteRCMThe calculation is performed according to equation (7):
in the formula: dRCM-the unsteady chloride diffusion coefficient of the concrete;
u-absolute value of voltage used;
t is the average of the initial temperature and the end temperature of the anode solution;
l is the thickness of the test piece;
Xd-average of chloride penetration depth;
t-duration of the test.
The results of the test are shown in FIG. 1. It can be seen that when the silicate concrete anticorrosive paint is used for concrete protection treatment, the carbonization depth of a C50 concrete sample subjected to standard 28-day curing is changed from 15.2mm to 4.3mm through a 28-day carbonization test, and is reduced by 71.7%. For the C50 concrete sample cured for 56 days, the chloride ion diffusion coefficient is from 72.3X 10-14m2The/s is reduced to 6.9 multiplied by 10-14m2And/s, reduced by 90.4%.
Example 2
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 40% of water-based organic silicon modified acrylic resin, 20% of silicon dioxide, 8% of graphene, 10% of crystalline flake basalt and 22% of water.
Wherein, the silicon dioxide is spherical and has a diameter of 50 nanometers.
Wherein, the graphene is multilayer graphene oxide, and the thickness of the graphene is 5 nanometers.
Wherein the equivalent diameter of the flake basalt is 60 micrometers, and the thickness of the flake basalt is 2 micrometers.
The coating preparation method and durability test method are as described in example 1. The test results are shown in fig. 2. It can be seen that when the silicate concrete anticorrosive paint is used for concrete protection treatment, the carbonization depth of a C50 concrete sample subjected to standard 28-day curing is changed from 15.2mm to 3.8mm through a 28-day carbonization test, and is reduced by 75%. For the C50 concrete sample cured for 56 days, the chloride ion diffusion coefficient is from 72.3X 10-14m2The/s is reduced to 7.8 multiplied by 10-14m2And/s, reduced by 89.2%.
Example 3
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 32% of water-based organic silicon modified acrylic resin, 18% of silicon dioxide, 3% of graphene, 9% of crystalline flake basalt and 38% of water.
Wherein, the silicon dioxide is spherical and has a diameter of 30 nanometers.
Wherein, the graphene is multilayer graphene oxide, and the thickness of the graphene is 5 nanometers.
Wherein the equivalent diameter of the flake basalt is 50 micrometers, and the thickness of the flake basalt is 1.2 micrometers.
The coating preparation method and durability test method are as described in example 1. The test results are shown in fig. 3. It can be seen that when the silicate concrete anticorrosive paint is used for concrete protection treatment, the carbonization depth of a standard cured C50 concrete sample for 28 days is changed from 15.2mm to 4.6mm through a 28-day carbonization test, and is reduced by 69.7%. For the C50 concrete sample cured for 56 daysThe diffusion coefficient of chloride ion is 72.3X 10-14m2The/s is reduced to 7.2 multiplied by 10-14m2And/s, reduced by 90%.
Example 4
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 38% of water-based organic silicon modified acrylic resin, 12% of silicon dioxide, 6% of graphene, 6% of crystalline flake basalt and 38% of water.
Wherein, the silicon dioxide is spherical and has a diameter of 25 nanometers.
The graphene is multilayer graphene oxide, and the thickness of the graphene is 4 nanometers.
Wherein the equivalent diameter of the flake basalt is 55 micrometers, and the thickness of the flake basalt is 1.4 micrometers.
The coating preparation method and durability test method are as described in example 1. The test results are shown in fig. 4. It can be seen that when the silicate concrete anticorrosive paint is used for concrete protection treatment, the carbonization depth of a C50 concrete sample subjected to standard 28-day curing is changed from 15.2mm to 4.0mm through a 28-day carbonization test, and is reduced by 73.7%. For the C50 concrete sample cured for 56 days, the chloride ion diffusion coefficient is from 72.3X 10-14m2The/s is reduced to 7.4 multiplied by 10-14m2And/s, reduced by 89.8%.
Example 5
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 36% of water-based organic silicon modified acrylic resin, 16% of silicon dioxide, 5% of graphene, 8% of crystalline flake basalt and 35% of water.
Wherein, the silicon dioxide is spherical and has a diameter of 45 nanometers.
The graphene is multilayer graphene oxide, and the thickness of the graphene is 3 nanometers.
Wherein the equivalent diameter of the flake basalt is 50 micrometers, and the thickness of the flake basalt is 1.8 micrometers.
The coating preparation method and durability test method are as described in example 1. The test results are shown in fig. 5. It can be seen that the silicate concrete anticorrosive paint of the invention is used for concrete protectionIn addition, the carbonization depth of the C50 concrete sample subjected to standard curing for 28 days is changed from 15.2mm to 4.2mm through a 28-day carbonization test, and is reduced by 72.4 percent. For the C50 concrete sample cured for 56 days, the chloride ion diffusion coefficient is from 72.3X 10-14m2The/s is reduced to 7.0 multiplied by 10-14m2And/s, reduced by 90.3%.
Example 6
The silicate concrete anticorrosive paint comprises the following components in percentage by weight: 34% of water-based organic silicon modified acrylic resin, 14% of silicon dioxide, 4% of graphene, 7% of crystalline flake basalt and 41% of water.
Wherein, the silicon dioxide is spherical and has the diameter of 35 nanometers.
The graphene is multilayer graphene oxide, and the thickness of the graphene is 4 nanometers.
Wherein the equivalent diameter of the flake basalt is 45 micrometers, and the thickness of the flake basalt is 1.6 micrometers.
The coating preparation method and durability test method are as described in example 1. The test results are shown in fig. 6. It can be seen that when the silicate concrete anticorrosive paint is used for concrete protection treatment, the carbonization depth of a C50 concrete sample subjected to standard 28-day curing is changed from 15.2mm to 4.5mm through a 28-day carbonization test, and is reduced by 70.4%. For the C50 concrete sample cured for 56 days, the chloride ion diffusion coefficient is from 72.3X 10-14m2The/s is reduced to 7.6 multiplied by 10-14m2And/s, reduced by 89.5%.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The silicate concrete anticorrosive paint is characterized by comprising the following raw materials in percentage by weight: 30-40% of water-based organic silicon modified acrylic resin, 10-20% of silicon dioxide, 2-8% of graphene, 5-10% of crystalline flake basalt and the balance of water.
2. The silicate concrete anticorrosive paint according to claim 1, which is prepared from the following raw materials in percentage by weight: 30-35% of water-based organic silicon modified acrylic resin, 10-15% of silicon dioxide, 2-5% of graphene, 5-7.5% of crystalline flake basalt and the balance of water.
3. The silicate concrete anticorrosive paint according to claim 1, which is prepared from the following raw materials in percentage by weight: 35-40% of water-based organic silicon modified acrylic resin, 15-20% of silicon dioxide, 5-8% of graphene, 7.5-10% of crystalline flake basalt and the balance of water.
4. A silicate concrete anticorrosive paint according to any one of claims 1 to 3, wherein the silica is spherical and has a diameter of 20 to 50 nm.
5. The silicate concrete anticorrosive paint according to any one of claims 1 to 3, wherein the graphene is a multilayer graphene oxide, and the thickness of the graphene is 3 to 5 nanometers.
6. The silicate concrete anticorrosive paint according to any one of claims 1 to 3, wherein the flake basalt has an equivalent diameter of 40 to 60 micrometers and a thickness of 1 to 2 micrometers.
7. The preparation method of the silicate concrete anticorrosive paint is characterized by comprising the following steps:
uniformly mixing the water-based organic silicon modified acrylic resin and water, adding spherical silicon dioxide powder to uniformly disperse the spherical silicon dioxide powder, and adding graphene to uniformly disperse the spherical silicon dioxide powder; finally, adding the flake basalt, and uniformly mixing to prepare the silicate concrete anticorrosive paint.
8. The method for preparing the silicate concrete anticorrosive paint according to claim 7, wherein the dispersion is carried out by an ultrasonic oscillation method.
9. The use method of the silicate concrete anticorrosive paint according to any one of claims 1 to 6, characterized in that the silicate concrete anticorrosive paint is loaded on the surface of a concrete test piece by brush coating or spray coating and cured to obtain the silicate concrete anticorrosive paint.
10. Use of the silicate concrete anticorrosive coating of any one of claims 1 to 6 in the fields of construction, shipbuilding, marine development, mechanical industry.
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| CN202111193522.4A CN113861777A (en) | 2021-10-13 | 2021-10-13 | Silicate concrete anticorrosive paint |
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