CN115491061B - Weatherproof and anticorrosive protection nano-coating for red sandstone in hydraulic engineering and preparation method thereof - Google Patents
Weatherproof and anticorrosive protection nano-coating for red sandstone in hydraulic engineering and preparation method thereof Download PDFInfo
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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
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention discloses a weatherproof anticorrosive protection nano coating for red sandstones, which is prepared by combining a component A and a component B according to a mass ratio of 4-5: 60-90 parts of water-based acrylic resin, 10-15 parts of deionized water, 3-9 parts of a film-forming additive, 1-3 parts of nano particles, 0.05-0.2 part of a defoaming agent and 0.2-0.6 part of a dispersing agent; the component B comprises, by mass, 70-90 parts of hexamethylene diisocyanate trimer and 10-30 parts of propylene glycol monomethyl ether acetate. According to the invention, the nano silicon oxide, the nano zirconium oxide and the nano graphene oxide are dispersed in the acrylic resin matrix in a flaky and layered manner, so that the compactness of the coating is improved, the invasion of small molecules such as water, carbon dioxide and microorganisms is effectively prevented, and the weather resistance and corrosion resistance of the red sandstone are improved.
Description
Technical Field
The invention relates to the field of hydraulic engineering construction, in particular to a weatherproof anticorrosion protection nano coating for red sandstone in hydraulic engineering and a preparation method thereof.
Background
Buildings such as dams, reservoirs, water delivery channels and the like in hydraulic engineering are built by stacking red sandstone, severe weathering and corrosion of the surrounding environment occur in the long-term operation process, weathered layers mostly fall off in a flaky manner, the whole weathered layers fall off by touching with hands, the service life of the buildings is seriously influenced, some buildings become potential safety hazards of the reservoirs and the dams, even the life safety of nearby people is influenced, and the weathering prevention and corrosion prevention protection of the red sandstone in the hydraulic engineering is not slow enough.
The rock destruction effect of the rock under the action and influence of water, air, solar energy and bioenergy is called as weathering effect, and the red sandstone is soft in texture, high in internal porosity and easy to weather. The main external factors influencing the weathering of the red sandstone include moisture, CO2 micromolecules, attached microorganisms, acid rain and the like.
Water is one of the main factors causing the weathering of the red sandstone, and firstly, the water is always the strongest inorganic solvent and can dissolve most mineral salts in the rock to cause the red sandstone to deteriorate orBreaking the membrane to convert the stabilized material into an ionic solvent. Meanwhile, water can react with acid gas (SO) in the air 2 Etc.) forming an acidic solution to corrode the stony material; some mineral salts are dissolved in water, but as the water evaporates, salt crystals form in the rock and over time, stress effects form in the rock voids, resulting in red sandstone failure. The water can shrink and expand along with freezing and dissolving due to the action of temperature difference, so that the red sandstone is frozen and cracked. Water is also the basis for the survival of plants and microorganisms, and water can be attached with a large number of microorganisms, which can also damage the red sandstone. The water can adsorb harmful dust in the air to corrode the stool surface of the rock. In summary, any breakdown of red sandstone is directly related to the presence of water.
The composition of the weathered phase is mainly SiO 2 And CaCO 3 CO in air 2 Into the surface of red sandstone, and CaCO 3 Reaction to form Ca (HCO) 3 ) 2 ，CaCO 3 +CO 2 +H 2 O=Ca(HCO 3 ) 2 ，Ca(HCO 3 ) 2 Is easy to dissolve in water and permeates to the surface of the rock along with running water to form crystals, so that the red sandstone is loosened and weathered quickly.
The plant growing on the surface of the red sandstone can prolong the storage time of water on the surface of the rock mass, so that the rock action time of the water is increased. The plant roots grow in the cracks of the rock mass and generate pressure on two walls of the cracks, and the pressure can reach 1.0-1.5 MPa according to measurement and calculation, and finally rock fracture can be caused. The chemical destruction of red sandstone is caused by the secretion produced by the metabolism of organisms and the decay and decomposition products of organisms after the death of organisms.
The anions in the acid rain mainly comprise sulfate ions, chloride ions and nitrate ions, and the ions can chemically react with the red sandstone to accelerate weathering corrosion.
200410060831.4 discloses a chemical strengthening method for redsand, which uses magnesium fluosilicate and an organic silicon penetrant, is suitable for protecting cultural relics, and is not suitable for the weathering prevention and corrosion prevention protection of redsand in hydraulic engineering. 202010513456.3 discloses a surface modified red sandstone material coated in water level amplitude variation zone, which belongs to polyurethane material, has good protection effect, and has the disadvantages of poor water resistance and easy change of the appearance of the red sandstone. 202011357478.1 discloses a water-based acrylic acid anticorrosive paint and a preparation method thereof, wherein the water-based acrylic acid emulsion and graphene oxide are adopted, the paint belongs to a single-component paint, and the paint has good corrosion resistance and weather resistance, but the water resistance and the bonding strength with red sandstone are insufficient, and the paint is not suitable for protection of the red sandstone. 202010976113.0 discloses a water-borne acrylic acid protective coating, which also belongs to a single-component non-nano coating.
Many acrylic coatings are disclosed in the prior art, both solvent-based and water-based. Most of the aqueous acrylic acid emulsion coatings are single-component aqueous acrylic acid emulsion coatings, have universal performance and convenient construction, are suitable for corrosion protection or decoration in general occasions, and a small amount of the aqueous acrylic acid emulsion coatings are double-component aqueous acrylic acid coatings, are mostly used for surface protection of woodware, automobiles and the like, and are rarely double-component aqueous acrylic acid nano coatings, and the double-component aqueous acrylic acid nano coatings consisting of nano silicon oxide, nano zirconium oxide and nano graphene oxide belong to the first time.
Disclosure of Invention
The invention provides a nano acrylic coating which is applicable to the weathering prevention and corrosion prevention protection of the red sandstone in the hydraulic engineering, and has the characteristics of colorlessness, transparency, no change of the morphology of the red sandstone, water-based environmental protection, no influence on the surrounding water environment, high bonding strength with the red sandstone, and good weathering prevention and corrosion prevention effects.
The anti-weathering and anti-corrosion protection nano coating for the red sandstone is prepared by combining a component A and a component B according to a mass ratio of 4-5, wherein the component A comprises the following substances in parts by mass: 60-90 parts of water-based acrylic resin, 10-15 parts of deionized water, 3-9 parts of a film-forming additive, 1-3 parts of nano particles, 0.05-0.2 part of a defoaming agent and 0.2-0.6 part of a dispersing agent; the component B comprises 70-90 parts of hexamethylene diisocyanate tripolymer and 10-30 parts of propylene glycol monomethyl ether acetate by mass.
The water-based acrylic resin is water-based hydroxyl acrylic resin with the hydroxyl content of 3.0-4.2 percent,
the film-forming assistant is one or two of ethylene glycol butyl ether and diethylene glycol butyl ether,
the nano particles comprise three types of nano silicon oxide, nano zirconium oxide and nano graphene oxide, wherein the three types of nano particles in the nano particles comprise 20-60 parts of nano silicon oxide, 20-60 parts of nano zirconium oxide and 20-60 parts of nano graphene oxide by mass.
Further preferably, the ratio of nano-silica: nano zirconia: the mass ratio of the nano graphene oxide is 3.
The defoaming agent and the dispersing agent are common methyl silicone oil and silane coupling agent on the market.
The component B comprises 70-90 parts by mass of hexamethylene diisocyanate trimer and 10-30 parts by mass of propylene glycol monomethyl ether acetate.
The mass ratio of the component A to the component B is 4. Further preferably, the component A: the component B is 4.5.
The preparation method comprises the following steps:
adding deionized water, a dispersing agent and nano particles into a high-speed dispersion machine, dispersing for 20-40 minutes under the condition of the rotation speed of 4000-6000 rpm, removing, carrying out ultrasonic cavitation for 5-15 minutes, adding a water-based acrylic resin, a film-forming assistant and a defoaming agent, and continuing to disperse for 30 minutes at a high speed to obtain a finished product A component; and then adding the component B, namely hexamethylene diisocyanate trimer and propylene glycol monomethyl ether acetate, into a dispersion machine, and dispersing for 5-15 minutes at the rotating speed of 1000-3000 r/min to obtain a finished product.
Further preferably, dispersing for 30 minutes at the rotation speed of 5000 r/min, removing, performing ultrasonic cavitation for 10 minutes, adding the water-based acrylic resin, the film-forming assistant and the defoaming agent, and continuously dispersing for 30 minutes at a high speed to obtain the finished product component A. Adding the component B, namely hexamethylene diisocyanate trimer and propylene glycol monomethyl ether acetate into a dispersion machine, and dispersing for 10 minutes at the rotating speed of 2000 r/min to obtain a finished coating.
Mixing the components A and B in proportion, stirring uniformly, and coating 2-3 times on the surface of the red sandstone by adopting a spraying, rolling or brushing way, wherein the total thickness of a coating dry film is 50-80 μm.
According to the invention, the nano silicon oxide, the nano zirconium oxide and the nano graphene oxide are dispersed in the acrylic resin matrix in a flaky and layered manner, so that the compactness of the coating is improved, the invasion of small molecules such as water, carbon dioxide and microorganisms is effectively prevented, the nano graphene oxide has excellent ultraviolet resistance, the weather resistance of the coating is improved, the nano silicon oxide and the nano zirconium oxide have very strong chemical activity, and the bonding strength of the coating and the red sandstone is improved. Meanwhile, after the nano particles are deeply inserted into the red sandstone along with the acrylic resin, the anti-disintegration capability of the body of the red sandstone is improved. The measures improve the weathering resistance and corrosion resistance of the red sandstone, and the improvement of the indexes of bonding strength, water resistance, salt mist resistance and aging resistance improves the weathering resistance.
Has the advantages that:
according to the invention, the nano silicon oxide, the nano zirconium oxide and the nano graphene oxide are dispersed in the acrylic resin matrix in a flaky and layered manner, so that the compactness of the coating is improved, the invasion of small molecules such as water, carbon dioxide and microorganisms is effectively prevented, the nano graphene oxide has excellent ultraviolet resistance, the weather resistance of the coating is improved, the nano silicon oxide and the nano zirconium oxide have very strong chemical activity, and the bonding strength of the coating and the red sandstone is improved. Meanwhile, after the nano particles penetrate into the red sandstone along with the acrylic resin, the anti-disintegration capability of the body of the red sandstone is improved. The measures improve the weathering resistance and the corrosion resistance of the red sandstone, and the disintegration resistance of the red sandstone is improved by more than 55 percent.
Detailed Description
The aqueous acrylic resin in the following examples is a commercially available aqueous hydroxy acrylic resin having a hydroxyl group content of 3.0% to 4.2%.
Example 1
The nanometer coating for preventing weathering and corrosion protection of the red sandstone consists of a component A and a component B, and the components are respectively shown in tables 1 and 2.
Table 1:
the water-based acrylic resin is water-based hydroxyl acrylic resin with the hydroxyl content of 3.0 percent,
the nano particles are composed of nano silicon oxide, nano zirconium oxide and nano graphene oxide according to a mass ratio of 3.
Table 2:
the mass ratio of the component A to the component B is 5.
Adding deionized water, a dispersing agent and nano particles into a high-speed dispersion machine, dispersing for 30 minutes at the rotation speed of 5000 r/min, moving out, performing ultrasonic cavitation for 10 minutes, adding a water-based acrylic resin, a film-forming assistant and a defoaming agent, and continuing to disperse for 30 minutes at a high speed to obtain a finished product component A; adding a component B, namely hexamethylene diisocyanate trimer and propylene glycol monomethyl ether acetate into a dispersion machine, and dispersing for 10 minutes at the rotating speed of 2000 r/min;
mixing the components A and B in proportion, stirring uniformly, and coating 2-3 times on the surface of the red sandstone by adopting a spraying, rolling or brushing way, wherein the total thickness of a coating dry film is 50-80 μm.
The performance of the weathering protection and corrosion protection nano-coating of the red sandstone is shown in table 3. The bonding strength of the coating and the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of the surface body of the red sandstone, the salt spray resistance is not peeled off after 3000 hours, and the disintegration resistance of the red sandstone is improved by 59 percent after the coating permeates into the interior of the red sandstone.
Table 3: weather-proof anticorrosive protective nano coating property of red sandstone
Example 2
The red sandstone weathering protection anticorrosion protection nano-coating consists of a component A and a component B, and is shown in tables 4 and 5.
TABLE 4
The water-based acrylic resin is water-based hydroxyl acrylic resin with the hydroxyl content of 4.2 percent,
TABLE 5
The mass ratio of the component A to the component B is 4.
Adding deionized water, a dispersing agent and nano particles into a high-speed dispersion machine, dispersing for 30 minutes at the rotation speed of 5000 r/min, moving out, performing ultrasonic cavitation for 10 minutes, adding a water-based acrylic resin, a film-forming assistant and a defoaming agent, and continuing to disperse for 30 minutes at a high speed to obtain a finished product component A; adding hexamethylene diisocyanate trimer and propylene glycol methyl ether acetate into a dispersion machine, and dispersing for 10 minutes at the rotating speed of 2000 r/min to obtain a finished product.
Mixing the components A and B in proportion, stirring uniformly, and coating 2-3 times on the surface of the red sandstone by adopting a spraying, rolling or brushing way, wherein the total thickness of a coating dry film is 50-80 μm. The test shows that the bonding strength of the red sandstone and the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of the surface body of the red sandstone, the salt spray resistance is not peeled off after 3000 hours, and the disintegration resistance of the red sandstone is improved by 55 percent after the red sandstone permeates into the interior of the red sandstone.
Example 3
The red sandstone weathering and corrosion protection nano-coating consists of a component A and a component B which are shown in tables 6 and 7.
TABLE 6
The water-based acrylic resin is water-based hydroxyl acrylic resin with the hydroxyl content of 4.2 percent,
TABLE 7
The mass ratio of the component A to the component B is 4.
Adding deionized water, a dispersing agent and nano particles into a high-speed dispersion machine, dispersing for 30 minutes at the rotation speed of 5000 r/min, moving out, performing ultrasonic cavitation for 10 minutes, adding a water-based acrylic resin, a film-forming assistant and a defoaming agent, and continuing to disperse for 30 minutes at a high speed to obtain a finished product component A; adding hexamethylene diisocyanate trimer and propylene glycol methyl ether acetate into a dispersion machine, and dispersing for 10 minutes at the rotating speed of 2000 r/min to obtain a finished product. Mixing the components A and B in proportion, stirring uniformly, and coating 2-3 times on the surface of the red sandstone by adopting a spraying, rolling or brushing way, wherein the total thickness of a coating dry film is 50-80 μm. The test shows that the bonding strength of the red sandstone adhesive with the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of a surface layer body of the red sandstone, the salt spray resistance is no bubble stripping after 1000 hours, the salt spray resistance is bubbling after 1500 hours, and the disintegration resistance of the red sandstone is improved by 26 percent after the red sandstone penetrates into the interior of the red sandstone.
Example 4 (without nanoparticles)
The red sandstone weathering protection anticorrosion protection nano-coating consists of a component A and a component B and is shown in tables 8 and 9.
TABLE 8
The water-based acrylic resin is water-based hydroxyl acrylic resin with the hydroxyl content of 4.2 percent,
TABLE 9
The mass ratio of the component A to the component B is 4
Adding deionized water, a dispersing agent, water-based acrylic resin, a film-forming assistant and a defoaming agent into a high-speed dispersion machine, and dispersing for 30 minutes at a high speed to obtain a finished product A component; adding hexamethylene diisocyanate trimer and propylene glycol methyl ether acetate into a dispersion machine, and dispersing for 10 minutes at the rotating speed of 2000 r/min to obtain a finished product. Mixing the components A and B in proportion, stirring uniformly, and coating 2-3 times on the surface of the red sandstone by adopting a spraying, rolling or brushing way, wherein the total thickness of a coating dry film is 50-80 μm. The test shows that the bonding strength of the red sandstone and the red sandstone is 0.6MPa, the salt spray resistance is 1000 hours, and the disintegration resistance of the red sandstone is improved by 11% after the red sandstone permeates into the red sandstone.
Example 5
This example is the same as example 3 except that the composition of the nanoparticles is different, and in this example, the nanoparticles are: 2.25 parts of nano silicon oxide and 0.75 part of nano zirconium oxide.
The bonding strength of the obtained coating and the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of the surface layer body of the red sandstone, the salt spray resistance is no bubble stripping after 1500 hours, the salt spray resistance is bubbling after 2000 hours, and the disintegration resistance of the red sandstone is improved by 33 percent after the coating permeates into the interior of the red sandstone.
Example 6
This example is the same as example 3 except that the composition of the nanoparticles is different, and in this comparative example, the nanoparticles are: 2.25 parts of nano zirconia, 0.75 part of nano graphene oxide.
The bonding strength of the obtained coating and the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of the surface body of the red sandstone, the salt spray resistance is 1500 hours, no foaming and peeling are generated, the salt spray resistance is 2000 hours, bubbling is generated, and the disintegration resistance of the red sandstone is improved by 37 percent after the coating permeates into the interior of the red sandstone.
Example 7
This example is the same as example 3 except that the composition of the nanoparticles is different, and in this comparative example, the nanoparticles are: 2.25 parts of nano silicon oxide and 0.75 part of nano graphene oxide.
The bonding strength of the obtained coating and the red sandstone is more than or equal to 2.0MPa or more than the tensile strength of the surface body of the red sandstone, the salt spray resistance is 1500 hours, no foaming and peeling are generated, the salt spray resistance is 2000 hours, bubbling is generated, and the disintegration resistance of the red sandstone is improved by 36% after the coating permeates into the interior of the red sandstone.
In conclusion, the nano silicon oxide, the nano zirconium oxide and the nano graphene oxide are dispersed in the acrylic resin matrix in a flaky and layered manner, and the three components have synergistic effects to jointly improve the compactness of the coating, effectively prevent small molecules such as water, carbon dioxide and microorganisms from invading, the nano graphene oxide has excellent ultraviolet resistance, the weather resistance of the coating is improved, the nano silicon oxide and the nano zirconium oxide have strong chemical activity, and the bonding strength between the coating and the red sandstone is improved. Meanwhile, after the nano particles are deeply inserted into the red sandstone along with the acrylic resin, the anti-disintegration capability of the body of the red sandstone is improved. The measures improve the weathering resistance and the corrosion resistance of the red sandstone.
Claims (8)
1. The anti-weathering and anti-corrosion protective nano coating for the red sandstone is characterized by being prepared by combining a component A and a component B according to a mass ratio of 4-5, wherein the component A comprises the following substances in parts by mass: 60-90 parts of water-based acrylic resin, 10-15 parts of deionized water, 3-9 parts of a film-forming additive, 1-3 parts of nano particles, 0.05-0.2 part of a defoaming agent and 0.2-0.6 part of a dispersing agent; the component B comprises 70-90 parts of hexamethylene diisocyanate trimer and 10-30 parts of propylene glycol monomethyl ether acetate by mass;
the nano particles are nano silicon oxide, nano zirconium oxide and nano graphene oxide, and three kinds of nano particles in the nano particles are composed of the following components in parts by mass: 20-60 parts of nano silicon oxide, 20-60 parts of nano zirconium oxide and 20-60 parts of nano graphene oxide;
nano silicon oxide in the nano particles: nano zirconia: the mass ratio of the nano graphene oxide is 3.
2. The nano coating for preventing weathering and corrosion protection of red sandstone according to claim 1, wherein the defoaming agent is methyl silicone oil.
3. The nano coating for preventing weathering and corrosion protection of red sandstone according to claim 1, wherein the dispersant is a silane coupling agent.
4. The nano coating for preventing weathering and corrosion protection of red sandstone according to claim 1, wherein the film-forming assistant is at least one of butyl cellosolve and butyl cellosolve.
5. The nano coating for preventing weathering and corrosion protection of red sandstone according to claim 1, wherein the aqueous acrylic resin is an aqueous hydroxy acrylic resin with a hydroxyl group content of 3.0-4.2%.
6. The preparation method of the efflorescence-free anticorrosive protection nano-coating of the red sandstone, according to claim 1, is characterized in that deionized water, a dispersing agent and nano-particles are added into a high-speed dispersion machine, the mixture is dispersed for 20 to 40 minutes under the condition of the rotation speed of 4000 to 6000 rpm, the mixture is removed, ultrasonic cavitation is carried out for 5 to 15 minutes, then the aqueous acrylic resin, the film-forming assistant and the defoaming agent are added, and the high-speed dispersion is continued for 30 minutes to obtain a finished product component A; and then adding the component B, namely hexamethylene diisocyanate trimer and propylene glycol monomethyl ether acetate into a dispersion machine, and dispersing for 5 to 15 minutes at the rotating speed of 1000 to 3000 rpm to obtain a finished product.
7. The application of the nano coating for preventing weathering and corrosion of red sandstone in hydraulic engineering, which is prepared according to the claim 1, in preventing weathering and corrosion of red sandstone.
8. The application of claim 7, wherein the red sandstone surface is coated by spraying, rolling or brushing for 2-3 times, and the total thickness of the coating dry film is 50-80 μm.
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| CN104910793A (en) * | 2015-06-05 | 2015-09-16 | 江苏理工学院 | Water-based fossil anti-aging paint and preparation method thereof |
| WO2017013670A1 (en) * | 2015-07-23 | 2017-01-26 | Asian Paints Ltd. | A one component self-healing coating composition |
| CN109385179A (en) * | 2018-09-25 | 2019-02-26 | 临沂大学 | A kind of coating and preparation method thereof containing modified graphene oxide |
| CN110845953A (en) * | 2019-10-31 | 2020-02-28 | 青川源泰建材科技有限公司 | Exterior wall environment-friendly coating and preparation method thereof |
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