CN110643265A - Water-based epoxy coating capable of being sprayed and dipped and preparation method thereof - Google Patents
Water-based epoxy coating capable of being sprayed and dipped and preparation method thereof Download PDFInfo
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- 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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- 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 relates to the technical field of coatings, and particularly discloses a water-based epoxy coating capable of being sprayed and dipped and a preparation method thereof. The curtain coatable waterborne epoxy coating comprises a component A and a component B; the component A comprises: bisphenol A epoxy resin aqueous dispersion, o-cresol formaldehyde epoxy resin aqueous dispersion, a solvent, a dispersing agent, an anti-settling agent, a wetting and leveling agent, a thickening agent, a defoaming agent, titanium dioxide, a filler and the balance of deionized water; the component B comprises: the curing agent comprises a water-based amine epoxy curing agent, an environment-friendly solvent and the balance of deionized water; the mass ratio of the component A to the component B is 5-7: 1. The water-based epoxy coating is used in the flow coating and dip coating processes of complex parts and devices, and the phenomena of cracking, pinholes and foaming can not occur.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based epoxy coating capable of being coated by spraying and dipping and a preparation method thereof.
Background
At present, the surface of a metal substrate is coated with a water-based two-component epoxy anticorrosive primer in the market, and the corrosion resistance, the rust resistance and the salt spray resistance of the primer can reach the standard of solvent-based coatings.
The current industrial coating of the water-based two-component epoxy coating mostly adopts spraying operation, and is equipped with corresponding spraying equipment to ensure good spraying efficiency and coating effect, but some parts with complex mechanical structures, such as radiating fins, have small intervals, the spraying and brushing can not meet the requirements, only a spraying or dip-coating operation mode can be adopted, but two components in the two-component epoxy system coating can react after being mixed, the activation period generally can not exceed 4h, the viscosity gradually rises along with the extension of the mixing time, the salt fog resistance, adhesive force, flexibility, chemical resistance and other properties of the coating are continuously reduced in the spraying or dip-coating process, the defects of uneven and easy cracking of the coating surface are further caused, the application of the coating in the field of more complex parts is influenced, and the external air pressure action is not generated in the spraying and dip-coating processes, so that bubbles and pinholes are easily generated on the surface of a paint film of the two-component epoxy coating in the coating process, the coating effect and the paint film performance are seriously influenced.
Disclosure of Invention
The invention provides a water-based epoxy coating capable of being coated by spraying and dipping and a preparation method thereof, aiming at the problems that the coating surface is uneven, easy to crack and easy to generate bubbles and pinholes because the existing water-based two-component epoxy coating adopts the coating modes of spraying and dipping.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a water-based epoxy coating capable of being sprayed and dipped comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
22-25% of bisphenol A epoxy resin aqueous dispersion, 8-10% of o-cresol formaldehyde epoxy resin aqueous dispersion, 0.8-1% of solvent, 1.5-1.8% of dispersant, 0.1-0.2% of anti-settling agent, 0.8-1% of wetting leveling agent, 0.4-0.6% of thickening agent, 0.6-0.7% of defoaming agent, 2-20% of titanium dioxide, 20-40% of filler and the balance of deionized water;
the component B comprises the following components in percentage by mass:
45-55% of water-based amine epoxy curing agent, 1-3% of environment-friendly solvent and the balance of deionized water;
the mass ratio of the component A to the component B is 5-7: 1.
Compared with the prior art, the water-based epoxy coating capable of being coated by spraying and dipping utilizes the combination of the bisphenol A epoxy resin water dispersoid and the o-cresol formaldehyde epoxy resin water dispersoid as a film-forming substance, and the curing agent adopts a water-based amine epoxy curing agent; the epoxy resin in the bisphenol A epoxy resin aqueous dispersion has hydroxyl, ether and extremely active epoxy groups, and the hydroxyl and the ether have high polarity, so that stronger intermolecular acting force is generated between epoxy molecules and the surface of a base material, and the epoxy groups react with free bonds on the surface of the base material to form chemical bonds, so that the adhesive force performance of a paint film can be greatly improved, but after the bisphenol A epoxy resin aqueous dispersion is compounded with a water-based amine epoxy curing agent, the activation period is short, usually 3-4h, and the workability is poor; the o-cresol formaldehyde epoxy resin aqueous dispersion is polyfunctional glycidyl ether type epoxy resin, each benzene ring of the o-cresol formaldehyde epoxy resin aqueous dispersion is connected with an epoxy group, the epoxy value is extremely high, a three-dimensional structure with high crosslinking density is easily formed, and the o-cresol formaldehyde epoxy resin aqueous dispersion is rich in a phenolic aldehyde skeleton, has excellent thermal stability, water resistance and acid and alkali resistance, but has higher brittleness after being used as a film forming substance and compounded with an aqueous amine epoxy curing agent; after the two film forming materials are combined according to a certain proportion, a special film structure with high crosslinking density, high hardness and strong toughness can be formed under the action of a water-based amine epoxy curing agent, so that a formed paint film has higher mechanical strength, and the activation period of the paint is greatly prolonged, so that after the component A and the component B of the paint are mixed, the activation period can be prolonged to more than 12 hours, and the paint can be used in the flow coating and dip coating processes of complex parts and devices without cracking, pinholes and foaming.
Preferably, the bisphenol A epoxy resin aqueous dispersion is of the type Epikote6520-WH-53A, and in particular, the Vast Epikote6520-WH-53A can be used.
Preferably, the type of the o-cresol formaldehyde epoxy resin aqueous dispersion is Epikote6006-W-68A, and particularly Vast's Epikote6006-W-68A can be used.
Preferably, the solvent is alcohol ester twelve, and a trace amount of the alcohol ester twelve can ensure good film forming property of the coating.
Preferably, the dispersing agent consists of an organic silicon gemini surfactant and an acrylate copolymer in a mass ratio of 1-3:1, wherein BYK-194 of Bike can be used as the organic silicon gemini surfactant, and Borchi Gen1252 of OMG can be used as the acrylate copolymer, and the organic silicon gemini surfactant and the acrylate copolymer have excellent dispersibility, good wrapping property on the viscosity-reducing pigment and unstable foam characteristics.
Preferably, the anti-settling agent is organically modified hectorite clay, and Bentoni DE of Hamming can be used, wherein Bentoni DE is an easily dispersible hectorite clay rheological aid subjected to fine treatment, has excellent anti-settling effect, and can help to improve the storage stability and sag resistance of a system.
Preferably, the wetting and leveling agent consists of an organosilicon gemini surfactant and a polyether modified polydimethylsiloxane copolymer in a mass ratio of 1-2:1, wherein the organosilicon gemini surfactant can be Tego4100 with Digao, the polyether modified polydimethylsiloxane copolymer can be BYK331 with Bike, the combination leveling property of the two is good, and the risk of stabilizing bubbles by donor ribbons is avoided.
Preferably, the thickening agent consists of a strong pseudoplastic polyurethane thickening agent and a solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive in a mass ratio of 1-2:1, wherein the strong pseudoplastic polyurethane thickening agent can be BorchiGel 0620, the solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive can be RAM-12W of Rohm and Haas, and the two are combined according to a certain proportion, so that high-efficiency low-shear viscosity can be provided, and the stability and the sag resistance of a coating system are improved.
Preferably, the defoaming agent consists of organic modified polysiloxane containing fumed silica and a self-emulsifying phosphate defoaming agent in a mass ratio of 2-3:1, wherein the organic modified polysiloxane containing fumed silica can be Tego900 and TEGO 810, and the self-emulsifying phosphate defoaming agent can be 941PL pioneered in France.
Preferably, the titanium dioxide is rutile type titanium dioxide, and can be selected from LR-996 of python.
Preferably, the filler consists of barium sulfate and talcum powder in a mass ratio of 1-2:1, wherein the barium sulfate is precipitated barium sulfate, the particle size of the precipitated barium sulfate is 1500-1600 meshes, and the talcum powder is 1250-1500 meshes.
Preferably, the water-based amine epoxy curing agent consists of a water-based modified amine solution and a water-reduced amine adduct of ethylene glycol monoisopropyl ether in a mass ratio of 1-2:1, wherein the water-based modified amine solution can be HUNTSMAN Aradur 35-1, and the water-reduced amine adduct of ethylene glycol monoisopropyl ether can be EpIKURE 8290 in Vast, and the combination of the two can ensure that the coating has excellent adhesion, salt fog resistance and faster surface drying speed; and/or
The environment-friendly solvent is propylene glycol butyl ether.
The invention also provides a preparation method of the water-based epoxy coating capable of being coated by showering and dipping, which at least comprises the following steps:
a. mixing deionized water, a solvent, a dispersing agent and an anti-settling agent according to the mass ratio, stirring for 10-15min at 1000r/min of 800-;
b. mixing the bisphenol A epoxy resin aqueous dispersion, the o-cresol formaldehyde epoxy resin aqueous dispersion and the defoaming agent according to the mass ratio, stirring at 1500r/min of 1200-30 min, adjusting the stirring speed to 800r/min of 600-20 min, adding the mixture, stirring for 15-20min, adding the wetting and leveling agent and the thickening agent, and adjusting the viscosity to 120KU of 110-120KU to obtain a component A;
c. mixing the water-based amine epoxy curing agent, the environment-friendly solvent and the deionized water according to the mass ratio, and stirring for 10-15min at the speed of 400-;
d. and mixing the component A and the component B according to the mass ratio of 5-7:1 to obtain the water-based epoxy coating.
Compared with the prior art, the preparation method of the water-based epoxy coating capable of being coated by spraying and dipping is simple, the equipment requirement is low, the manufacturing cost is low, and no harmful gas is volatilized in the preparation process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A water-based epoxy coating capable of being sprayed and dipped comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
22% of bisphenol A epoxy resin aqueous dispersion, 10% of o-cresol formaldehyde epoxy resin aqueous dispersion, 0.8% of alcohol ester dodeca, 1.5% of dispersing agent, 0.1% of organic modified hectorite clay, 0.8% of wetting and leveling agent, 0.4% of thickening agent, 0.6% of defoaming agent, 2% of rutile type titanium dioxide, 40% of filler and 21.8% of deionized water;
the component B comprises the following components in percentage by mass:
45% of water-based amine epoxy curing agent, 1% of propylene glycol butyl ether and 54% of deionized water;
the mass ratio of the component A to the component B is 5: 1.
Wherein, the bisphenol A epoxy resin aqueous dispersion selects Vast Epikote 6520-WH-53A; the o-cresol formaldehyde epoxy resin aqueous dispersion selects Vast Epikote 6006-W-68A; the dispersing agent consists of an organic silicon gemini surfactant and an acrylate copolymer in a mass ratio of 1:1, wherein the organic silicon gemini surfactant is BYK-194 of Bike, and the acrylate copolymer is Borchi Gen1252 of OMG; the organic modified hectorite clay is Bentoni DE of Hamming; the wetting and leveling agent consists of an organosilicon gemini structure surfactant and a polyether modified polydimethylsiloxane copolymer in a mass ratio of 1:1, wherein the organosilicon gemini structure surfactant is Tego4100 with dike, and the polyether modified polydimethylsiloxane copolymer is BYK331 with bike; the thickening agent consists of a strong pseudoplastic polyurethane thickening agent and a solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive in a mass ratio of 1:1, wherein the strong pseudoplastic polyurethane thickening agent is Borchi Gel0620, and the solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive is RAM-12W of Rohm and Haas; the defoaming agent consists of organic modified polysiloxane containing gas-phase silicon dioxide and a self-emulsifying phosphate defoaming agent in a mass ratio of 2:1, wherein Tego900 is selected as the organic modified polysiloxane containing gas-phase silicon dioxide and TEGO 810 is selected as the self-emulsifying phosphate defoaming agent; the rutile type titanium dioxide is LR-996 of python; the filler consists of barium sulfate and talcum powder in a mass ratio of 1:1, wherein the barium sulfate is precipitated barium sulfate, the particle size of the barium sulfate is 1500-1600 meshes, and the particle size of the talcum powder is 1250-1500 meshes; the water-based amine epoxy curing agent consists of a water-based modified amine solution and a water reducing amine adduct of ethylene glycol monoisopropyl ether in a mass ratio of 1:1, wherein the water-based modified amine solution is HUNTSMAN Aradur 35-1, and the water reducing amine adduct of ethylene glycol monoisopropyl ether is Vansen's EPIKURE 8290.
The preparation method of the water-based epoxy coating capable of being coated by showering and dipping comprises the following steps:
a. mixing deionized water, alcohol ester dodecahydrate, a dispersing agent and the organic modified hectorite clay according to the mass ratio, stirring at 800r/min for 10min, adding rutile titanium dioxide and a filler, stirring at 1000r/min for 15min, and grinding until the fineness is less than 20 mu m to obtain a mixture;
b. mixing the bisphenol A epoxy resin aqueous dispersion, the o-cresol formaldehyde epoxy resin aqueous dispersion and the defoaming agent according to the mass ratio, stirring for 25min at 1200r/min, adjusting the stirring speed to 600r/min, adding the mixture, stirring for 15min, adding the wetting leveling agent and the thickening agent, and adjusting the viscosity to 110KU to obtain a component A;
c. mixing the waterborne amine epoxy curing agent, propylene glycol monobutyl ether and deionized water according to the mass ratio, and stirring at 400r/min for 10min to obtain a component B;
d. and mixing the component A and the component B according to the mass ratio of 5:1 to obtain the water-based epoxy coating.
Example 2
A water-based epoxy coating capable of being sprayed and dipped comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
24% of bisphenol A epoxy resin aqueous dispersion, 9% of o-cresol formaldehyde epoxy resin aqueous dispersion, 0.9% of alcohol ester dodeca, 1.6% of dispersing agent, 0.2% of organic modified hectorite clay, 0.9% of wetting and leveling agent, 0.5% of thickening agent, 0.7% of defoaming agent, 10% of rutile type titanium dioxide, 30% of filler and 22.2% of deionized water;
the component B comprises the following components in percentage by mass:
50% of water-based amine epoxy curing agent, 2% of propylene glycol butyl ether and 48% of deionized water;
the mass ratio of the component A to the component B is 6: 1.
Wherein, the bisphenol A epoxy resin aqueous dispersion selects Vast Epikote 6520-WH-53A; the o-cresol formaldehyde epoxy resin aqueous dispersion selects Vast Epikote 6006-W-68A; the dispersing agent consists of an organic silicon gemini surfactant and an acrylate copolymer in a mass ratio of 2:1, wherein the organic silicon gemini surfactant is BYK-194 of Bike, and the acrylate copolymer is Borchi Gen1252 of OMG; the organic modified hectorite clay is Bentoni DE of Hamming; the wetting and leveling agent consists of an organosilicon gemini structure surfactant and a polyether modified polydimethylsiloxane copolymer in a mass ratio of 2:1, wherein the organosilicon gemini structure surfactant is Tego4100 with Digao, and the polyether modified polydimethylsiloxane copolymer is BYK331 with Bike; the thickening agent consists of a strong pseudoplastic polyurethane thickening agent and a solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive in a mass ratio of 2:1, wherein the strong pseudoplastic polyurethane thickening agent is Borchi Gel0620, and the solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive is RAM-12W of Rohm and Haas; the defoaming agent consists of organic modified polysiloxane containing gas-phase silicon dioxide and a self-emulsifying phosphate defoaming agent in a mass ratio of 2:1, wherein Tego900 is selected as the organic modified polysiloxane containing gas-phase silicon dioxide and TEGO 810 is selected as the self-emulsifying phosphate defoaming agent; the rutile type titanium dioxide is LR-996 of python; the filler consists of barium sulfate and talcum powder in a mass ratio of 2:1, wherein the barium sulfate is precipitated barium sulfate, the particle size of the barium sulfate is 1500-1600 meshes, and the particle size of the talcum powder is 1250-1500 meshes; the water-based amine epoxy curing agent consists of a water-based modified amine solution and a water reducing amine adduct of ethylene glycol monoisopropyl ether in a mass ratio of 2:1, wherein the water-based modified amine solution is HUNTSMAN Aradur 35-1, and the water reducing amine adduct of ethylene glycol monoisopropyl ether is Vansen's EPIKURE 8290.
The preparation method of the water-based epoxy coating capable of being coated by showering and dipping comprises the following steps:
a. mixing deionized water, alcohol ester dodecahydrate, a dispersing agent and the organic modified hectorite clay according to the mass ratio, stirring for 12min at 9000r/min, adding rutile titanium dioxide and a filler, stirring for 18min at 1100r/min, and grinding to the fineness of less than 20 mu m to obtain a mixture;
b. mixing the bisphenol A epoxy resin aqueous dispersion, the o-cresol formaldehyde epoxy resin aqueous dispersion and the defoaming agent according to the mass ratio, stirring for 28min at 1300r/min, adjusting the stirring speed to 700r/min, adding the mixture, stirring for 180min, adding the wetting leveling agent and the thickening agent, and adjusting the viscosity to 120KU to obtain a component A;
c. mixing the waterborne amine epoxy curing agent, propylene glycol monobutyl ether and deionized water according to the mass ratio, and stirring at 500r/min for 12min to obtain a component B;
d. and mixing the component A and the component B according to the mass ratio of 6:1 to obtain the water-based epoxy coating.
Example 3
A water-based epoxy coating capable of being sprayed and dipped comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
25% of bisphenol A epoxy resin aqueous dispersion, 8% of o-cresol formaldehyde epoxy resin aqueous dispersion, 1% of alcohol ester dodeca, 1.8% of dispersing agent, 0.2% of organic modified hectorite clay, 1% of wetting and leveling agent, 0.6% of thickening agent, 0.7% of defoaming agent, 20% of rutile type titanium dioxide, 20% of filler and the balance of deionized water;
the component B comprises the following components in percentage by mass:
55% of water-based amine epoxy curing agent, 3% of propylene glycol butyl ether and 42% of deionized water;
the mass ratio of the component A to the component B is 7: 1.
Wherein, the bisphenol A epoxy resin aqueous dispersion selects Vast Epikote 6520-WH-53A; the o-cresol formaldehyde epoxy resin aqueous dispersion selects Vast Epikote 6006-W-68A; the dispersing agent consists of an organic silicon gemini surfactant and an acrylate copolymer in a mass ratio of 3:1, wherein the organic silicon gemini surfactant is BYK-194 of Bike, and the acrylate copolymer is Borchi Gen1252 of OMG; the organic modified hectorite clay is Bentoni DE of Hamming; the wetting and leveling agent consists of an organosilicon gemini structure surfactant and a polyether modified polydimethylsiloxane copolymer in a mass ratio of 2:1, wherein the organosilicon gemini structure surfactant is Tego4100 with Digao, and the polyether modified polydimethylsiloxane copolymer is BYK331 with Bike; the thickening agent consists of a strong pseudoplastic polyurethane thickening agent and a solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive in a mass ratio of 2:1, wherein the strong pseudoplastic polyurethane thickening agent is Borchi Gel0620, and the solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive is RAM-12W of Rohm and Haas; the defoaming agent consists of organic modified polysiloxane containing gas-phase silicon dioxide and a self-emulsifying phosphate defoaming agent in a mass ratio of 3:1, wherein Tego900 is selected as the organic modified polysiloxane containing gas-phase silicon dioxide and TEGO 810 is selected as the self-emulsifying phosphate defoaming agent; the rutile type titanium dioxide is LR-996 of python; the filler consists of barium sulfate and talcum powder in a mass ratio of 2:1, wherein the barium sulfate is precipitated barium sulfate, the particle size of the barium sulfate is 1500-1600 meshes, and the particle size of the talcum powder is 1250-1500 meshes; the water-based amine epoxy curing agent consists of a water-based modified amine solution and a water reducing amine adduct of ethylene glycol monoisopropyl ether in a mass ratio of 2:1, wherein the water-based modified amine solution is HUNTSMAN Aradur 35-1, and the water reducing amine adduct of ethylene glycol monoisopropyl ether is Vansen's EPIKURE 8290.
The preparation method of the water-based epoxy coating capable of being coated by showering and dipping comprises the following steps:
a. mixing deionized water, alcohol ester dodecahydrate, a dispersing agent and the organic modified hectorite clay according to the mass ratio, stirring for 15min at 1000r/min, adding rutile titanium dioxide and a filler, stirring for 20min at 1200r/min, and grinding until the fineness is less than 20 mu m to obtain a mixture;
b. mixing the bisphenol A epoxy resin aqueous dispersion, the o-cresol formaldehyde epoxy resin aqueous dispersion and the defoaming agent according to the mass ratio, stirring for 30min at 1500r/min, adjusting the stirring speed to 800r/min, adding the mixture, stirring for 20min, adding the wetting leveling agent and the thickening agent, and adjusting the viscosity to 120KU to obtain a component A;
c. mixing the waterborne amine epoxy curing agent, propylene glycol monobutyl ether and deionized water according to the mass ratio, and stirring at 500r/min for 15min to obtain a component B;
d. and mixing the component A and the component B according to the mass ratio of 7:1 to obtain the water-based epoxy coating.
Comparative example 1
The same amount of melamine formaldehyde resin was used in place of the aqueous amine epoxy hardener in example 1, and the other components and preparation method were the same as in example 1, to obtain an aqueous epoxy coating material.
The properties of the aqueous epoxy coating materials obtained in examples 1 to 3 and comparative example 1 were measured, and the results are shown in the following table:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A water-based epoxy coating capable of being sprayed and dipped is characterized in that: comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
22-25% of bisphenol A epoxy resin aqueous dispersion, 8-10% of o-cresol formaldehyde epoxy resin aqueous dispersion, 0.8-1% of solvent, 1.5-1.8% of dispersant, 0.1-0.2% of anti-settling agent, 0.8-1% of wetting leveling agent, 0.4-0.6% of thickening agent, 0.6-0.7% of defoaming agent, 2-20% of titanium dioxide, 20-40% of filler and the balance of deionized water;
the component B comprises the following components in percentage by mass:
45-55% of water-based amine epoxy curing agent, 1-3% of environment-friendly solvent and the balance of deionized water;
the mass ratio of the component A to the component B is 5-7: 1.
2. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the bisphenol A epoxy resin aqueous dispersion is of the type Epikote 6520-WH-53A.
3. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the model of the o-cresol formaldehyde epoxy resin aqueous dispersion is Epikote 6006-W-68A.
4. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the solvent is alcohol ester twelve.
5. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the dispersing agent consists of an organic silicon gemini surfactant and an acrylate copolymer in a mass ratio of 1-3: 1.
6. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the anti-settling agent is an organic modified hectorite clay; and/or
The wetting and leveling agent consists of an organic silicon gemini structure surfactant and polyether modified polydimethylsiloxane copolymer in a mass ratio of 1-2: 1.
7. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the thickening agent consists of a strong pseudoplastic polyurethane thickening agent and a solvent-free aqueous nonionic associative hydrophobically modified polyurethane rheological additive in a mass ratio of 1-2: 1; and/or
The defoaming agent consists of organic modified polysiloxane containing gas-phase silicon dioxide and self-emulsifying phosphate defoaming agent in the mass ratio of 2-3: 1.
8. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the titanium dioxide is rutile type titanium dioxide; and/or
The filler is composed of barium sulfate and talcum powder in a mass ratio of 1-2:1, the particle size of the barium sulfate is 1500-1600 meshes, and the particle size of the talcum powder is 1250-1500 meshes.
9. The curtain and dip coatable waterborne epoxy coating of claim 1, wherein: the water-based amine epoxy curing agent consists of a water-based modified amine solution and a water reducing amine adduct of ethylene glycol monoisopropyl ether in a mass ratio of 1-2: 1; and/or
The environment-friendly solvent is propylene glycol butyl ether.
10. A method of preparing a curtain and dip coatable waterborne epoxy coating according to any one of claims 1-9, characterized in that: at least comprises the following steps:
a. mixing deionized water, a solvent, a dispersing agent and an anti-settling agent according to the mass ratio, stirring for 10-15min at 1000r/min of 800-;
b. mixing the bisphenol A epoxy resin aqueous dispersion, the o-cresol formaldehyde epoxy resin aqueous dispersion and the defoaming agent according to the mass ratio, stirring at 1500r/min of 1200-30 min, adjusting the stirring speed to 800r/min of 600-20 min, adding the mixture, stirring for 15-20min, adding the wetting and leveling agent and the thickening agent, and adjusting the viscosity to 120KU of 110-120KU to obtain a component A;
c. mixing the water-based amine epoxy curing agent, the environment-friendly solvent and the deionized water according to the mass ratio, and stirring for 10-15min at the speed of 400-;
d. and mixing the component A and the component B according to the mass ratio of 5-7:1 to obtain the water-based epoxy coating.
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| CN113372768A (en) * | 2021-07-19 | 2021-09-10 | 河北晨阳工贸集团有限公司 | Bottom-surface-in-one water paint for container and preparation method thereof |
| CN113980550A (en) * | 2021-11-10 | 2022-01-28 | 珠海展辰新材料股份有限公司 | Water-based phenolic epoxy coating and preparation method thereof |
| CN115873474A (en) * | 2022-12-09 | 2023-03-31 | 中国核动力研究设计院 | Light shield top coating material for preventing Po-210 pollution on surfaces of walls and ceilings in nuclear facilities and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113372768A (en) * | 2021-07-19 | 2021-09-10 | 河北晨阳工贸集团有限公司 | Bottom-surface-in-one water paint for container and preparation method thereof |
| CN113372768B (en) * | 2021-07-19 | 2022-06-21 | 河北晨阳工贸集团有限公司 | Bottom-surface-in-one water paint for container and preparation method thereof |
| CN113980550A (en) * | 2021-11-10 | 2022-01-28 | 珠海展辰新材料股份有限公司 | Water-based phenolic epoxy coating and preparation method thereof |
| CN115873474A (en) * | 2022-12-09 | 2023-03-31 | 中国核动力研究设计院 | Light shield top coating material for preventing Po-210 pollution on surfaces of walls and ceilings in nuclear facilities and application |
| CN115873474B (en) * | 2022-12-09 | 2023-11-28 | 中国核动力研究设计院 | Light cover coating material for preventing pollution of wall and ceiling surface Po-210 in nuclear facilities and application |
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