CN114213933A - Water-based two-component epoxy coating applied to wet-on-wet process and preparation method thereof - Google Patents
Water-based two-component epoxy coating applied to wet-on-wet process and preparation method thereof Download PDFInfo
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- CN114213933A CN114213933A CN202111488892.0A CN202111488892A CN114213933A CN 114213933 A CN114213933 A CN 114213933A CN 202111488892 A CN202111488892 A CN 202111488892A CN 114213933 A CN114213933 A CN 114213933A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003973 paint Substances 0.000 claims abstract description 27
- 239000004593 Epoxy Substances 0.000 claims abstract description 17
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 239000000049 pigment Substances 0.000 claims abstract description 16
- 239000008367 deionised water Substances 0.000 claims abstract description 13
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 8
- 150000001412 amines Chemical class 0.000 claims abstract description 7
- 239000004606 Fillers/Extenders Substances 0.000 claims abstract description 6
- 238000004040 coloring Methods 0.000 claims abstract description 6
- 239000006184 cosolvent Substances 0.000 claims abstract description 6
- 239000002270 dispersing agent Substances 0.000 claims abstract description 6
- 239000003112 inhibitor Substances 0.000 claims abstract description 6
- 239000002562 thickening agent Substances 0.000 claims abstract description 6
- 239000000080 wetting agent Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229920002125 Sokalan® Polymers 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 5
- 239000004584 polyacrylic acid Substances 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 125000000524 functional group Chemical group 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 8
- 239000012855 volatile organic compound Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 241001448624 Miliaria Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000006115 industrial coating Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- C09D7/20—Diluents or solvents
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a water-based two-component epoxy coating applied to a wet-on-wet process and a preparation method thereof, and relates to the water-based two-component epoxy coating applied to the wet-on-wet process, which comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 20-35 parts of aqueous epoxy emulsion, 3-5 parts of antirust pigment, 1-3 parts of coloring pigment, 10-20 parts of extender, 5-10 parts of elastic polyacrylic emulsion, 1-3 parts of solvent, 1-2 parts of dispersing agent, 0.3-1 part of defoaming agent, 0.3-1 part of wetting agent, 0.5-1 part of flash rust inhibitor, 0.5-2 parts of thickening agent and 10-20 parts of deionized water; the component B comprises the following components in parts by weight: 20-50 parts of water-based amine curing agent, 15-30 parts of cosolvent and 20-30 parts of deionized water; the paint prepared by the invention has the advantages of extremely low VOC emission, excellent environmental protection performance, good water resistance and humidity resistance, ensures that a paint film has good leveling property, is not easy to crack and has good mechanical performance when the engineering machinery works in a high-temperature low-humidity environment, and is particularly suitable for the construction of the engineering machinery.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based two-component epoxy coating applied to a wet-on-wet process and a preparation method thereof.
Background
In recent years, the national form of environmental protection is severe, and the industrial coating industry has gradually developed from the traditional solvent-based coating to the green coating. The water-based paint has the advantages that the discharge of VOC (volatile organic compounds) of the water-based paint is greatly reduced compared with that of a solvent-based paint by comprehensively analyzing the aspects of safety, coating performance, energy consumption, construction difficulty, equipment universality degree, economy and the like, and meanwhile, the water-based paint has low smell and low harm to human bodies and is more suitable for sensitive people.
At present, a matched coating product commonly used for engineering machinery is a water-based epoxy coating. And because the parts of the engineering machinery are mostly made of large and thick steel, the heat capacity of the workpiece is very large, the workpiece heating efficiency is relatively low, the energy consumption is large, the coating efficiency is extremely low, and the primer of the current engineering machinery field process needs to be baked when not completely dried, so that the construction efficiency is greatly delayed.
In order to solve the above-mentioned technical problems, research has been conducted on a water-based epoxy coating that can be wet-on-wet without baking. For example, Chinese patent publication No. CN 112831248A discloses a wet-on-wet ultra-fast dry water-based epoxy primer and a preparation method thereof, the components of the primer comprise a component A and a component B, wherein the raw materials of the component A comprise, by weight, 25-50 parts of epoxy resin, 0.1-0.5 part of defoaming agent, 0.1-1 part of anti-settling agent, 2-10 parts of pigment, 20-50 parts of filler, 0-10 parts of anti-rust pigment and 0-20 parts of deionized water; the raw materials of the component B comprise a water-based curing agent, the finally prepared water-based epoxy primer capable of being wetted by wet and ultra-fast dried is prepared at intervals of 10min on the bottom surface, the finish paint has no defects of air bubble miliaria and the like, and the water-based epoxy primer has good glossiness, realizes real wet and wet, greatly improves the construction efficiency, and is particularly suitable for assembly line construction. Although the invention achieves the effects of quick drying, no need of baking, no bubble miliaria in a paint film and the like, the quick-drying waterborne epoxy coating easily causes the problems of quick drying, poor leveling property of the paint film, cracking of the paint film, poor mechanical property and the like in a high-temperature low-humidity environment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a water-based two-component epoxy coating applied to a wet-on-wet process and a preparation method thereof.
In order to achieve the aim, the invention designs a water-based two-component epoxy coating applied to a wet-on-wet process, which comprises a component A and a component B, wherein the component A is a main component of the water-based two-component epoxy coating applied to the wet-on-wet process and comprises the following raw materials in parts by weight:
20-35 parts of water-based epoxy emulsion,
3-5 parts of an anti-rust pigment,
1-3 parts of a coloring pigment,
10-20 parts of an extender filler,
5-10 parts of elastic polyacrylic acid emulsion,
1-3 parts of a solvent, namely,
1-2 parts of a dispersing agent,
0.3 to 1 portion of defoaming agent,
0.3 to 1 portion of wetting agent,
0.5-1 part of flash rust inhibitor,
0.5 to 2 portions of thickening agent,
10-20 parts of deionized water;
the component B is a curing agent part of a water-based bi-component epoxy coating applied to a wet-on-wet process, and comprises the following raw materials in parts by weight:
20-50 parts of a water-based amine curing agent,
15-30 parts of a cosolvent,
20-30 parts of deionized water.
Preferably, the water-based two-component epoxy coating applied to the wet-on-wet process further comprises the step of using the water-based epoxy emulsion as a base resin, and carrying out special molecular weight design and functional group modification on the quick-drying water-based epoxy emulsion.
Preferably, the aqueous two-component epoxy coating applied to the wet-on-wet process further comprises zirconium beads which are required to be added in the preparation process of the component A.
The preparation method of the water-based double-component epoxy coating applied to the wet-on-wet process comprises the following specific steps:
preparation of a component A:
(1) sequentially adding deionized water, a dispersing agent and a defoaming agent into a stirring container, dispersing for 5-10 minutes under the stirring condition of 800 revolutions per minute in 500 plus materials, and then sequentially adding an antirust pigment, a coloring pigment and an extender filler, and dispersing for 15 minutes at a high speed under the stirring condition of 1500 revolutions per minute in 1000 plus materials;
(2) adding zirconium beads, dispersing at high speed under the condition of 2000-2500 rpm, filtering and pouring into a paint mixing cylinder when the fineness reaches below 30 micrometers;
(3) in a paint mixing cylinder, sequentially adding the water-based epoxy emulsion, the elastic polyacrylic acid emulsion, the solvent, the defoaming agent, the wetting agent, the flash rust inhibitor and the thickening agent into the paint mixing cylinder for dispersing for 10-15 minutes under the stirring condition of 500-800 r/min respectively to prepare a component A;
b, preparation of a component:
sequentially adding deionized water, cosolvent and amine curing agent into a clean paint mixing cylinder, controlling the feeding time within 30 minutes, and stirring for 15 minutes to prepare a component B;
a preparation method of a water-based two-component epoxy coating applied to a wet-on-wet process comprises the following steps:
and mixing the component A and the component B according to the mass ratio of 7:1, and then adding 10% of water according to the construction viscosity requirement for mixing to obtain the water-based two-component epoxy coating applied to the wet-on-wet process.
Compared with the prior art, the invention has the following advantages:
1. low VOC emission and excellent environmental protection performance;
2. the paint film has good leveling property, is not easy to crack and has good mechanical property when the engineering machinery operates in a high-temperature low-humidity environment.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
The key to realizing the water-based wet-on-wet coating is to adjust the drying speed of the water-based epoxy primer and control the volatilization gradient between two coatings. When the formula of the waterborne two-component epoxy primer is designed, the proper epoxy emulsion, amine curing agent, solvent system, flexible resin, and matched auxiliary agent system and pigment and filler system are screened through experiments under the condition of meeting the performance. The aqueous two-component epoxy systems require a particularly optimized equivalence ratio and play a crucial role in the paint film properties. Meanwhile, when the pigment volume concentration of the formula is designed, optimization design is required according to the characteristics of different powder and resin, so that the influence on the coating performance and dryness is great, and the influence on the appearance effect of the water-based double-component polyurethane finish paint in the field of wet-on-wet application is great.
The concrete steps of the embodiment are as follows;
(1) preparation of a component A: sequentially adding deionized water, a dispersing agent and a defoaming agent into a stirring container, dispersing for 5-10 minutes under the stirring condition of 800 revolutions per minute in 500 plus materials, and then sequentially adding an antirust pigment, a coloring pigment and an extender filler, and dispersing for 15 minutes at a high speed under the stirring condition of 1500 revolutions per minute in 1000 plus materials; adding zirconium beads, dispersing at high speed under the condition of 2000-2500 rpm, filtering and pouring into a paint mixing cylinder when the fineness reaches below 30 micrometers; in a paint mixing cylinder, sequentially adding the water-based epoxy emulsion, the elastic polyacrylic acid emulsion, the solvent, the defoaming agent, the wetting agent, the flash rust inhibitor and the thickening agent into the paint mixing cylinder for dispersing for 10-15 minutes under the stirring condition of 500-800 r/min respectively to prepare a component A;
(2) b, preparation of a component: sequentially adding deionized water, cosolvent and amine curing agent into a clean paint mixing cylinder, controlling the feeding time within 30 minutes, and stirring for 15 minutes to prepare a component B;
(3) a preparation method of a water-based two-component epoxy coating applied to a wet-on-wet process comprises the following steps: and mixing the component A and the component B according to the mass ratio of 7:1, and then adding 10% of water according to the construction viscosity requirement for mixing to obtain the water-based two-component epoxy coating applied to the wet-on-wet process.
The following examples are compared to conventional waterborne and solvent borne coatings for performance and are shown in Table 1:
TABLE 1
As can be seen from Table 1, the physicochemical properties of the aqueous wet-on-wet coating of the embodiment have the advantages of minimum VOC content, excellent environmental protection performance, good water resistance, good humidity resistance and good drying performance, and ensures that the leveling property of the paint film is good, the paint film is not easy to crack and the mechanical performance is good when the engineering machinery operates in a high-temperature low-humidity environment.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The aqueous two-component epoxy coating applied to the wet-on-wet process comprises a component A and a component B, wherein the component A is a main component of the aqueous two-component epoxy coating applied to the wet-on-wet process, and the main raw materials comprise the following components in parts by weight:
20-35 parts of water-based epoxy emulsion,
3-5 parts of an anti-rust pigment,
1-3 parts of a coloring pigment,
10-20 parts of an extender filler,
5-10 parts of elastic polyacrylic acid emulsion,
1-3 parts of a solvent, namely,
1-2 parts of a dispersing agent,
0.3 to 1 portion of defoaming agent,
0.3 to 1 portion of wetting agent,
0.5-1 part of flash rust inhibitor,
0.5 to 2 portions of thickening agent,
10-20 parts of deionized water;
the component B is a curing agent part of a water-based bi-component epoxy coating applied to a wet-on-wet process, and comprises the following raw materials in parts by weight:
20-50 parts of a water-based amine curing agent,
15-30 parts of a cosolvent,
20-30 parts of deionized water.
2. The waterborne two-component epoxy coating applied to the wet-on-wet process according to claim 1, wherein the waterborne epoxy emulsion is a fast-drying waterborne epoxy emulsion based on solid epoxy resin and modified by special molecular weight design and functional groups.
3. The two-component waterborne epoxy coating for use in a wet-on-wet process of claim 1, wherein the A component requires the addition of zirconium beads during the preparation process.
4. A method of preparing a two-component waterborne epoxy coating for use in a wet-on-wet process according to any of claims 1-3, wherein the step of preparing the a-component comprises:
(1) sequentially adding deionized water, a dispersing agent and a defoaming agent into a stirring container, dispersing for 5-10 minutes under the stirring condition of 800 revolutions per minute in 500 plus materials, and then sequentially adding an antirust pigment, a coloring pigment and an extender filler, and dispersing for 15 minutes at a high speed under the stirring condition of 1500 revolutions per minute in 1000 plus materials;
(2) adding zirconium beads, dispersing at high speed under the condition of 2000-2500 rpm, filtering and pouring into a paint mixing cylinder when the fineness reaches below 30 micrometers;
(3) in a paint mixing cylinder, sequentially adding the water-based epoxy emulsion, the elastic polyacrylic acid emulsion, the solvent, the defoaming agent, the wetting agent, the flash rust inhibitor and the thickening agent into the paint mixing cylinder for dispersing for 10-15 minutes under the stirring condition of 500-800 r/min respectively to prepare a component A;
the preparation method of the component B comprises the following steps: sequentially adding deionized water, cosolvent and amine curing agent into a clean paint mixing cylinder, controlling the feeding time within 30 minutes, and stirring for 15 minutes to prepare a component B;
the preparation method of the water-based two-component epoxy coating applied to the wet-on-wet process comprises the steps of mixing the component A and the component B according to the mass ratio of 7:1, and then adding 10% of water according to the construction viscosity requirement for mixing to obtain the water-based two-component epoxy coating applied to the wet-on-wet process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488892.0A CN114213933A (en) | 2021-12-08 | 2021-12-08 | Water-based two-component epoxy coating applied to wet-on-wet process and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111488892.0A CN114213933A (en) | 2021-12-08 | 2021-12-08 | Water-based two-component epoxy coating applied to wet-on-wet process and preparation method thereof |
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| Publication Number | Publication Date |
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| CN114213933A true CN114213933A (en) | 2022-03-22 |
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Cited By (2)
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| CN115286970A (en) * | 2022-06-23 | 2022-11-04 | 南京长江涂料有限公司 | Solvent-free epoxy anticorrosion primer capable of wet-on-wet construction and preparation method thereof |
| CN115926582A (en) * | 2022-11-21 | 2023-04-07 | 浩力森涂料（上海）有限公司 | High-reaction-speed high-adhesion high-solid epoxy primer and preparation method thereof |
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| CN115286970A (en) * | 2022-06-23 | 2022-11-04 | 南京长江涂料有限公司 | Solvent-free epoxy anticorrosion primer capable of wet-on-wet construction and preparation method thereof |
| CN115926582A (en) * | 2022-11-21 | 2023-04-07 | 浩力森涂料（上海）有限公司 | High-reaction-speed high-adhesion high-solid epoxy primer and preparation method thereof |
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Application publication date: 20220322 |