CN114058246A - High-strength corrosion-resistant water-based epoxy coating and preparation method thereof - Google Patents
High-strength corrosion-resistant water-based epoxy coating and preparation method thereof Download PDFInfo
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
Abstract
The invention discloses a high-strength corrosion-resistant water-based epoxy coating and a preparation method thereof, wherein the high-strength corrosion-resistant water-based epoxy coating comprises a component A and a component B; the component A comprises the following substances in parts by weight: 70-90 parts of epoxy resin emulsion, 5-15 parts of deionized water and 0.3-0.5 part of thickening agent; the component B comprises the following substances in parts by weight: 10-25 parts of water-based epoxy curing agent, 1-5 parts of functional assistant, 40-60 parts of zinc powder and 6-12 parts of modified sol; the modified sol is silica sol with solid content of 10%. The preparation method comprises the following steps: s1, preparing a component A; s2, preparing a component B; s3, curing. According to the application, the modified sol is used as a carrier, zinc powder is dispersed and filled into the coating, and a coating formed after the coating is formed into a film is well supported and coated, so that the strength of the corrosion-resistant water-based epoxy coating is improved, and the durability of the coating is further improved.
Description
Technical Field
The invention relates to the field of epoxy coatings, in particular to a high-strength corrosion-resistant water-based epoxy coating and a preparation method thereof.
Background
Epoxy coating products are widely used in various industries because of their good adhesion to substrates, excellent chemical resistance, and low volumetric shrinkage. The water-based epoxy zinc-rich paint has the advantages of environmental protection of the water-based paint on the maintenance of excellent salt spray resistance and adhesive force, and is widely used for rail transit, engineering machinery and industrial paint.
However, in the long-term use process of the water-based paint, pinholes and defects inevitably occur after the water is evaporated, cured and formed into a film, and H is caused in the later service period2O, O2 and penetration of corrosive media such as electrolytes to cause the matrix to be porousCorrosion failure. The addition of various synergistic materials to waterborne coatings is therefore a key issue in improving the long-term corrosion performance of coatings. However, the simple addition of various anticorrosive materials inevitably leads to the occurrence of agglomeration among the components in the coating, and the agglomerated added materials not only can not achieve the effect of enhancing the compactness, but also can possibly reduce the mechanical property of the coating, thereby reducing the service life of the coating.
Disclosure of Invention
In order to relieve the influence of hard water on the suspension performance of the suspending agent and ensure the prevention and control effect of the suspending agent, the application provides the high-strength corrosion-resistant water-based epoxy coating and the preparation method thereof.
In a first aspect, the application provides a high-strength corrosion-resistant water-based epoxy coating, which comprises a component A and a component B; the component A comprises the following substances in parts by weight:
70-90 parts of epoxy resin emulsion;
5-15 parts of deionized water;
0.3-0.5 part of thickening agent;
the component B comprises the following substances in parts by weight:
10-25 parts of a water-based epoxy curing agent;
1-5 parts of a functional assistant;
40-60 parts of zinc powder;
6-12 parts of modified sol; the modified sol is silica sol with solid content of 10%.
By adopting the technical scheme, the zinc powder is used as a main material for anticorrosion modification, the zinc is active and is easy to oxidize to protect a matrix, and oxides generated after the zinc powder is oxidized can be filled in the defects of pinholes and the like of a paint film, so that the shielding effect of the paint film is enhanced, and the corrosion resistance is improved. Therefore, the zinc powder is added into the formula, so that the oxidation resistance of the paint film can be further enhanced, the solid content of the paint liquid is higher, and the flexibility of the paint film is further influenced.
On the basis, the modified sol is used as a carrier, so that on one hand, the modified sol material can be used as a carrier for dispersing zinc powder, and effectively disperses the zinc powder and enables the zinc powder to be filled into the coating; on the other hand, the modified sol material can be used as a toughening modifier to well support and coat a coating formed after the coating is formed into a film, so that the strength of the corrosion-resistant water-based epoxy coating is improved, and the durability of the corrosion-resistant water-based epoxy coating is further improved.
Preferably, the modified sol also comprises titanium dioxide and zirconium dioxide composite sol, and the mass ratio of the titanium dioxide sol to the zirconium dioxide sol to the silicon dioxide sol is 1: 0.5-0.8: 3-5.
By adopting the technical scheme, the components of the modified sol are further optimized, the components of the single modified sol are improved by organically combining titanium dioxide and zirconium dioxide, and the zirconium dioxide sol is a metal oxide material with excellent thermal stability and mechanical stability, so that the shielding effect of the coating can be improved. After the titanium dioxide sol is added into the epoxy resin, the titanium dioxide sol can react with the epoxy resin, the compactness of the coating is enhanced, the crosslinking degree of the coating is improved, and therefore the barrier property of the coating is enhanced. Meanwhile, the optimized modified sol is a transition metal oxide, has high mechanical stability, and has a large number of active groups on the surface, so that the compactness of the coating is enhanced, and the invasion of corrosive media is avoided, thereby improving the strength of the corrosion-resistant water-based epoxy coating and further improving the durability of the corrosion-resistant water-based epoxy coating.
Preferably, the component B also comprises 6-10 parts by weight of a two-dimensional carbon material.
Through adopting above-mentioned technical scheme, two-dimensional carbon material has been selected for use in this application, because two-dimensional nano-material has excellent lamellar structure owing to its unique nature, through its compact lamellar structure, can effectively block outside corrosion medium, and its compact structure can effectively prolong the diffusion path of corroding the medium simultaneously, and both schemes are mutually supported, play good dual protection's effect. And secondly, due to the addition of the two-dimensional carbon material, a conductive path can be further formed among zinc powder particles, so that the overall utilization rate of the zinc powder in the coating is improved, the corrosion resistance of the coating is further improved, the strength of the corrosion-resistant water-based epoxy coating is finally improved, and the durability of the coating is further improved.
Preferably, the two-dimensional carbon material is prepared by adopting the following scheme:
taking glucose as a carbon source, placing the glucose in a sodium chloride aqueous solution, stirring and mixing the glucose and the sodium chloride aqueous solution, and collecting a mixed solution; and placing the mixed solution in a reaction furnace, carrying out high-temperature carbonization treatment under the protection of protective gas, cooling to room temperature, washing and drying to prepare the two-dimensional carbon material.
By adopting the technical scheme, the glucose is added into the sodium chloride solution, the sodium chloride material is firstly separated out and serves as a hard template and a dispersing agent in a high-temperature state, the surface of the sodium chloride material is utilized to promote the separation of the glucose, an attached space is provided for the separation of the glucose and the high-temperature pyrolysis, and the sodium chloride material serves as the hard template and the dispersing agent, so that the finally prepared carbon material is formed into a two-dimensional sheet structure.
Preferably, the two-dimensional carbon material is a zinc intercalation type two-dimensional carbon material.
Through adopting above-mentioned technical scheme, the structure of two-dimensional carbon material has further been optimized in this application, inlays zinc type two-dimensional carbon material through forming, can combine two-dimensional carbon material and zinc granule organic, can't form the problem of homodisperse structure when improving zinc powder and carbon material complex in the traditional scheme. Through effectively gomphosis zinc material to two-dimensional carbon material, effectively promote in the coating the two-dimensional carbon material and epoxy's collective effect to effectively reduce hole and clearance in the coating, promote the separation effect of coating. In addition, the zinc particles are embedded in the two-dimensional carbon material, so that the conductivity of the coating can be reduced, the transfer of corrosion electrons in the coating is hindered in the initial corrosion stage of the coating, and the coating substrate and the coating cannot form a galvanic cell, so that the corrosion tendency is lower.
Preferably, the zinc-embedded two-dimensional carbon material is prepared by adopting the following scheme:
taking glucose as a carbon source and zinc nitrate as a zinc source, respectively placing the zinc nitrate and the glucose in a sodium chloride aqueous solution, stirring and mixing, and collecting a mixed solution; and placing the mixed solution in a reaction furnace, carrying out high-temperature carbonization treatment under the protection of protective gas, cooling to room temperature, washing and drying to prepare the zinc-embedded two-dimensional carbon material.
By adopting the scheme, zinc nitrate is dispersed into glucose, a sodium chloride material is firstly separated out and serves as a hard template and a dispersing agent, zinc nitrate is decomposed and forms zinc oxide under a high-temperature environment, the zinc oxide is reduced by carbon to form zinc particles under a high-temperature state, and meanwhile, a large amount of gas generated by decomposition of zinc carbonate causes a graphitized carbon matrix to generate a porous structure and is gradually coated inside the two-dimensional carbon material to form the stable zinc-embedded two-dimensional carbon material.
Preferably, the high-temperature carbonization treatment temperature is 680-750 ℃.
Through adopting above-mentioned technical scheme, this application has optimized the stability of high temperature carbomorphism, because zinc nitrate decomposition temperature is 350 ~ 450 ℃, this application adopts higher carbomorphism temperature for the decomposition efficiency of zinc nitrate on the one hand. On the other hand, in this temperature state, the zinc oxide material can react with the carbon material and be reduced by carbon into zinc particles, thereby forming a good mosaic structure.
In a second aspect, the present application provides a method for preparing a high-strength corrosion-resistant water-based epoxy coating, which comprises the following steps:
s1, preparation of component A: firstly, stirring and mixing the epoxy resin emulsion, deionized water and a thickening agent, and collecting the component A;
s2, preparation of component B: firstly, stirring and mixing a water-based epoxy curing agent and a liquid functional assistant, stirring, mixing, grinding and dispersing zinc powder, a solid functional assistant two-dimensional carbon material and modified sol, sieving and collecting to obtain a component B;
s3, curing treatment: the component A and the component B are prepared and then cured, and the high-strength corrosion-resistant waterborne epoxy coating can be prepared after compounding.
By adopting the technical scheme, the waterborne epoxy curing agent and the liquid functional auxiliary agent are mixed firstly, and then the rest solid particles are ground and dispersed together, so that the dispersing performance of each component is effectively improved, and meanwhile, the A, B component is prepared separately, so that the reaction and oxidation of the zinc powder and the epoxy resin emulsion in the component A are prevented, and the prepared waterborne epoxy coating has excellent mechanical property and corrosion resistance.
In summary, the present application has the following beneficial effects:
1. according to the application, zinc powder is used as a main material for anticorrosion modification, the zinc is active and is easy to oxidize to protect a matrix, and oxides generated after the zinc powder is oxidized can be filled in the defects of pinholes and the like of a paint film, so that the shielding effect of the paint film is enhanced, and the corrosion resistance is improved. Therefore, the zinc powder is added into the formula, so that the oxidation resistance of the paint film can be further enhanced, the solid content of the paint liquid is higher, and the flexibility of the paint film is further influenced.
On the basis, the modified sol is used as a carrier, so that on one hand, the modified sol material can be used as a carrier for dispersing zinc powder, and effectively disperses the zinc powder and enables the zinc powder to be filled into the coating; on the other hand, the modified sol material can be used as a toughening modifier to well support and coat a coating formed after the coating is formed into a film, so that the strength of the corrosion-resistant water-based epoxy coating is improved, and the durability of the corrosion-resistant water-based epoxy coating is further improved.
2. The two-dimensional carbon material has been selected for use to this application, because two-dimensional nano-material has excellent lamellar structure owing to its unique nature, through its compact lamellar structure, can effectively block outside corrosion medium, and its compact structure can effectively prolong the diffusion path of corroding the medium simultaneously, and both schemes are mutually supported, play good duplicate protection's effect. And secondly, due to the addition of the two-dimensional carbon material, a conductive path can be further formed among zinc powder particles, so that the overall utilization rate of the zinc powder in the coating is improved, the corrosion resistance of the coating is further improved, the strength of the corrosion-resistant water-based epoxy coating is finally improved, and the durability of the coating is further improved.
3. The structure of two-dimensional carbon material has further been optimized to this application, inlays zinc type two-dimensional carbon material through forming, can combine two-dimensional carbon material and zinc granule organic, can't form the problem of homodisperse structure when improving zinc powder and carbon material complex in the traditional scheme. Through effectively gomphosis zinc material to two-dimensional carbon material, effectively promote in the coating the two-dimensional carbon material and epoxy's collective effect to effectively reduce hole and clearance in the coating, promote the separation effect of coating. In addition, the zinc particles are embedded in the two-dimensional carbon material, so that the conductivity of the coating can be reduced, the transfer of corrosion electrons in the coating is hindered in the initial corrosion stage of the coating, and the coating substrate and the coating cannot form a galvanic cell, so that the corrosion tendency is lower.
Detailed Description
The present application will be described in further detail with reference to examples.
In the embodiments of the present application, the selected materials are as follows, but not limited to:
materials: epoxy resin emulsion EW 1601: jinan resin easy Limited;
thickener BYK-420: shanghai Kayin chemical Co., Ltd.
Preparation example of modified Sol
Preparation example 1
1kg of titanium dioxide sol with the solid content of 10 percent, 0.5kg of zirconium dioxide sol with the solid content of 10 percent and 3kg of silicon dioxide sol slab with the solid content of 10 percent are mixed to prepare the modified sol solution 1.
Preparation example 2
1kg of titanium dioxide sol with the solid content of 10 percent, 0.65kg of zirconium dioxide sol with the solid content of 10 percent and 4kg of silicon dioxide sol slab with the solid content of 10 percent are mixed to prepare the modified sol solution 2.
Preparation example 3
1kg of titanium dioxide sol with the solid content of 10 percent, 0.8kg of zirconium dioxide sol with the solid content of 10 percent and 5kg of silicon dioxide sol slab with the solid content of 10 percent are mixed to prepare modified sol solution 3.
Examples of preparation of two-dimensional carbon Material
Preparation example 4
Taking 0.2kg of glucose as a carbon source, placing the glucose into 10kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 680 ℃ at 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 1.
Preparation example 54
Taking 0.2kg of glucose as a carbon source, placing the glucose into 12kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 680 ℃ at 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 2.
Preparation example 6
Taking 0.2kg of glucose as a carbon source, placing the glucose into 15kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 680 ℃ at 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 3.
Preparation example 7
Taking 0.2kg of glucose as a carbon source and 0.08kg of zinc nitrate, placing the mixture into 10kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing the mixture, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 680 ℃ at 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 4.
Preparation example 8
Taking 0.2kg of glucose as a carbon source and 0.09kg of zinc nitrate, placing the mixture into 10kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing the mixture, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 710 ℃ at the speed of 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 5.
Preparation example 9
Taking 0.2kg of glucose as a carbon source and 0.1kg of zinc nitrate, placing the mixture into 10kg of sodium chloride aqueous solution with the mass fraction of 50%, stirring and mixing the mixture, and collecting mixed liquor; and (3) drying the mixed solution at 50 ℃, then placing the dried substance in a reaction furnace, heating to 750 ℃ at the speed of 5 ℃/min under the protection of argon gas, carrying out high-temperature carbonization treatment, cooling to room temperature, washing and drying to obtain the two-dimensional carbon material 6.
Preparation example 10
0.8kg of dispersant BYK-181, 0.8kg of wetting agent BYK-378, 0.8kg of defoaming agent BYK-011, 0.8kg of flatting agent BYK-381, 20kg of talcum powder and 8kg of wollastonite powder are taken, stirred and mixed to prepare the functional additive.
Examples
Embodiment 1, a high-strength corrosion-resistant water-based epoxy coating, wherein a silica sol with a solid content of 10% is selected as a modified sol a, and is prepared according to the following steps:
s1, preparation of component A: firstly, stirring and mixing the epoxy resin emulsion, deionized water and a thickening agent, and collecting the component A;
s2, preparation of component B: firstly, stirring and mixing a water-based epoxy curing agent and a liquid functional assistant, stirring, mixing, grinding and dispersing zinc powder, a solid functional assistant two-dimensional carbon material and modified sol, sieving and collecting to obtain a component B;
s3, curing treatment: after the component A and the component B are prepared, standing and curing are carried out for 3 hours, and the high-strength corrosion-resistant waterborne epoxy coating can be prepared after compounding.
Examples 2 to 6
The selection and the dosage of the raw materials of the high-strength corrosion-resistant water-based epoxy coating are shown in the table 1. The preparation method is the same as that of example 1.
Examples 7 to 9
The selection and the dosage of the raw materials of the high-strength corrosion-resistant water-based epoxy coating are shown in Table 2. The preparation method is the same as that of example 4.
Table 1, selection of raw materials and their use levels (kg) in examples 1 to 6
Table 2, examples 7 to 12, selection of raw materials and their use (. kg)
Comparative example
Comparative example 1, a waterborne epoxy coating, differs from example 1 in that no modified sol is added.
Comparative example 2, a water-based epoxy paint, differs from example 1 in that no zinc powder was added.
Performance test
A tinplate, a sandblasted steel plate and a test bar were prepared. The coating is sprayed to a tinplate, the thickness of the coating film is 25 mu m, and the thickness of the coating film for testing the corrosion resistance is 100 mu m.
The panels were left to cure at room temperature for 7d and then tested for performance. The adhesion force of different coatings before and after soaking in 3.5% NaCl solution for 24h is tested according to GB/T9286-1998 cross-section method, and the adhesion force grade is 0-5 grade from high to low.
Testing the neutral salt spray resistance of the coating according to GB/T1771-2007;
the impact strength is determined according to GB/T1732-1993 'determination of the impact resistance of paint films'; the specific detection results are shown in table 3 below:
TABLE 3 Performance test Table
And (3) analyzing test results:
comparing examples 1 to 12 and comparative examples 1 to 2 with Table 2, it can be found that:
examples 1 to 3, 4 to 6, 7 to 9 and 10 to 12 were divided into 4 groups and compared with comparative examples 1 to 2.
(1) Comparing examples 1-3 with comparative examples 1-2, the data of examples 1-3 is obviously due to the data of comparative examples 1-2, and the technical scheme of examples 1-3 is combined, so that the technical scheme of the application adopts zinc powder as the main material for anticorrosion modification, the zinc is active and is easy to oxidize to protect the matrix, and oxides generated after the zinc powder is oxidized can be filled in the defects of pinholes and the like of the paint film, so that the shielding effect of the paint film is enhanced, and the corrosion resistance is improved. Therefore, the zinc powder is added into the formula, so that the oxidation resistance of the paint film can be further enhanced, the solid content of the paint liquid is higher, and the flexibility of the paint film is further influenced.
(2) Comparing examples 4-6 with example 1, it can be found by combining the data in table 3 that the technical scheme of the present application further optimizes the components of the modified sol, improves the components of the single modified sol through the organic combination of titanium dioxide and zirconium dioxide, and can improve the shielding effect of the coating because the zirconium dioxide sol is a metal oxide material with excellent thermal stability and mechanical stability. After the titanium dioxide sol is added into the epoxy resin, the titanium dioxide sol can react with the epoxy resin, the compactness of the coating is enhanced, the crosslinking degree of the coating is improved, and therefore the barrier property of the coating is enhanced. Meanwhile, the optimized modified sol is a transition metal oxide, has high mechanical stability, and has a large number of active groups on the surface, so that the compactness of the coating is enhanced, and the invasion of corrosive media is avoided, thereby improving the strength of the corrosion-resistant water-based epoxy coating and further improving the durability of the corrosion-resistant water-based epoxy coating.
(3) Comparing the embodiments 7 to 9 with the embodiment 4, it can be found by combining the data in table 3, which shows that the two-dimensional carbon material is selected in the present application, because the two-dimensional nanomaterial has an excellent layered structure due to its unique properties, the two-dimensional nanomaterial can effectively block an external corrosion medium by its compact layered structure, and at the same time, the compact structure can effectively prolong a diffusion path of the corrosion medium, and the two schemes are mutually matched to achieve a good dual protection effect. And secondly, due to the addition of the two-dimensional carbon material, a conductive path can be further formed among zinc powder particles, so that the overall utilization rate of the zinc powder in the coating is improved, the corrosion resistance of the coating is further improved, the strength of the corrosion-resistant water-based epoxy coating is finally improved, and the durability of the coating is further improved.
(4) Finally, comparing examples 10-12 with comparative examples 4 and examples 7-9, the data of examples 10-12 is the most excellent, and further explaining that the structure of the two-dimensional carbon material is optimized, the two-dimensional carbon material and zinc particles can be organically combined through the formed zinc-embedded two-dimensional carbon material, and the problem that a uniformly dispersed structure cannot be formed when zinc powder and the carbon material are compounded in the traditional scheme is solved. Through effectively gomphosis zinc material to two-dimensional carbon material, effectively promote in the coating the two-dimensional carbon material and epoxy's collective effect to effectively reduce hole and clearance in the coating, promote the separation effect of coating. In addition, the zinc particles are embedded in the two-dimensional carbon material, so that the conductivity of the coating can be reduced, the transfer of corrosion electrons in the coating is hindered in the initial corrosion stage of the coating, and the coating substrate and the coating cannot form a galvanic cell, so that the corrosion tendency is lower.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The high-strength corrosion-resistant water-based epoxy coating is characterized by comprising a component A and a component B; the component A comprises the following substances in parts by weight:
70-90 parts of epoxy resin emulsion;
5-15 parts of deionized water;
0.3-0.5 part of thickening agent;
the component B comprises the following substances in parts by weight:
10-25 parts of a water-based epoxy curing agent;
1-5 parts of a functional assistant;
40-60 parts of zinc powder;
6-12 parts of modified sol; the modified sol is silica sol with solid content of 10%.
2. The high-strength corrosion-resistant water-based epoxy coating as claimed in claim 1, wherein the modified sol further comprises a titanium dioxide and zirconium dioxide composite sol, and the mass ratio of the titanium dioxide sol to the zirconium dioxide sol to the silicon dioxide sol is 1: 0.5-0.8: 3-5.
3. The high-strength corrosion-resistant water-based epoxy paint as claimed in claim 1, wherein the component B further comprises 6-10 parts by weight of a two-dimensional carbon material.
4. The high-strength corrosion-resistant water-based epoxy paint as claimed in claim 3, wherein the two-dimensional carbon material is prepared by the following scheme:
taking glucose as a carbon source, placing the glucose in a sodium chloride aqueous solution, stirring and mixing the glucose and the sodium chloride aqueous solution, and collecting a mixed solution; and placing the mixed solution in a reaction furnace, carrying out high-temperature carbonization treatment under the protection of protective gas, cooling to room temperature, washing and drying to prepare the two-dimensional carbon material.
5. The high-strength corrosion-resistant water-based epoxy paint as claimed in claim 3, wherein the two-dimensional carbon material is a zinc-embedded two-dimensional carbon material.
6. The high-strength corrosion-resistant water-based epoxy paint as claimed in claim 5, wherein the zinc-embedded two-dimensional carbon material is prepared by the following scheme:
taking glucose as a carbon source and zinc nitrate as a zinc source, respectively placing the zinc nitrate and the glucose in a sodium chloride aqueous solution, stirring and mixing, and collecting a mixed solution; and placing the mixed solution in a reaction furnace, carrying out high-temperature carbonization treatment under the protection of protective gas, cooling to room temperature, washing and drying to prepare the zinc-embedded two-dimensional carbon material.
7. A high-strength corrosion-resistant water-based epoxy coating according to any one of claim 4 or claim 6, wherein the high-temperature carbonization treatment temperature is 680-750 ℃.
8. A preparation method of the high-strength corrosion-resistant water-based epoxy coating as claimed in any one of claims 1 to 7, characterized by comprising the following preparation steps:
s1, preparation of component A: firstly, stirring and mixing the epoxy resin emulsion, deionized water and a thickening agent, and collecting the component A;
s2, preparation of component B: firstly, stirring and mixing a water-based epoxy curing agent and a liquid functional assistant, stirring, mixing, grinding and dispersing zinc powder, a solid functional assistant two-dimensional carbon material and modified sol, sieving and collecting to obtain a component B;
s3, curing treatment: the component A and the component B are prepared and then cured, and the high-strength corrosion-resistant waterborne epoxy coating can be prepared after compounding.
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| CN202111648844.3A CN114058246A (en) | 2021-12-31 | 2021-12-31 | High-strength corrosion-resistant water-based epoxy coating and preparation method thereof |
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| CN202111648844.3A CN114058246A (en) | 2021-12-31 | 2021-12-31 | High-strength corrosion-resistant water-based epoxy coating and preparation method thereof |
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| CN114702881A (en) * | 2022-04-20 | 2022-07-05 | 湖南省德谦新材料有限公司 | Solvent-free epoxy graphene zinc powder coating and preparation method thereof |
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