CN115895400A - Low-surface-treatment water-based epoxy coating and preparation method thereof - Google Patents
Low-surface-treatment water-based epoxy coating and preparation method thereof Download PDFInfo
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- CN115895400A CN115895400A CN202211483741.0A CN202211483741A CN115895400A CN 115895400 A CN115895400 A CN 115895400A CN 202211483741 A CN202211483741 A CN 202211483741A CN 115895400 A CN115895400 A CN 115895400A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 238000004381 surface treatment Methods 0.000 title claims abstract description 42
- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title description 5
- 239000004593 Epoxy Substances 0.000 claims abstract description 97
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 51
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- 239000000839 emulsion Substances 0.000 claims abstract description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002562 thickening agent Substances 0.000 claims abstract description 16
- 239000000080 wetting agent Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 15
- 239000003973 paint Substances 0.000 claims abstract description 15
- 239000010452 phosphate Substances 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical class O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims abstract description 14
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 14
- 239000002114 nanocomposite Substances 0.000 claims abstract description 14
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 14
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims abstract description 14
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 14
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 14
- 239000002808 molecular sieve Substances 0.000 claims abstract description 13
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- 229920002635 polyurethane Polymers 0.000 claims abstract description 13
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- -1 phosphate ester Chemical class 0.000 claims abstract description 7
- 238000001723 curing Methods 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 18
- 239000003921 oil Substances 0.000 claims description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 14
- 239000003094 microcapsule Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 244000226021 Anacardium occidentale Species 0.000 claims description 10
- 235000020226 cashew nut Nutrition 0.000 claims description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
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- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 229920000768 polyamine Polymers 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- WMDZKDKPYCNCDZ-UHFFFAOYSA-N 2-(2-butoxypropoxy)propan-1-ol Chemical compound CCCCOC(C)COC(C)CO WMDZKDKPYCNCDZ-UHFFFAOYSA-N 0.000 claims description 4
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- IBLKWZIFZMJLFL-UHFFFAOYSA-N 1-phenoxypropan-2-ol Chemical compound CC(O)COC1=CC=CC=C1 IBLKWZIFZMJLFL-UHFFFAOYSA-N 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 229920001400 block copolymer Polymers 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 43
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
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Abstract
The invention discloses a low-surface treatment water-based epoxy coating, which relates to the technical field of coatings and comprises the following components: and (2) component A: a non-ionic aqueous epoxy emulsion; fumed silica; nano aluminum hydroxide; a carbon nanocomposite; a monofunctional epoxy reactive diluent; absolute ethyl alcohol; a film-forming aid; a dispersant; a wetting agent; defoaming agents; a polyurethane thickener; deionized water; iron oxide red powder; zinc phosphate; aluminum tripolyphosphate; a modified aluminum phosphate molecular sieve; wet grinding sericite powder; an aqueous epoxy phosphate ester; and B component: a waterborne epoxy curing agent; modifying a water-based epoxy curing agent; propylene glycol methyl ether; an anti-flash rust agent; deionized water. The invention solves the technical problems that the water-based epoxy anticorrosive paint in the prior art cannot ensure long-acting corrosion resistance and cannot be repaired.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a low-surface-treatment water-based epoxy coating and a preparation method thereof.
Background
The low surface treatment epoxy paint is an anticorrosive paint with lower requirement level on the surface treatment of a steel structure before coating. In the anticorrosion coating of a steel structure, in order to ensure the anticorrosion quality of a coating, the steel needs to be subjected to thorough sandblasting pretreatment, and the steel generally reaches Sa2.5 grade (GB/T8923 Steel surface before coating corrosion grade and derusting grade). However, for the maintenance of some old projects, such as old oil tanks, pipelines, steel structures and the like of petrochemical systems, and the maintenance of ships and oil platforms, the surface of the steel structure is seriously rusted in the maintenance work site, the site sand blasting and rust removal are limited by conditions, the rust removal quality cannot meet the technical requirements of Sa2.5 grade due to the technical quality of constructors and other reasons, and the corrosion prevention quality cannot be ensured. In addition, the surface of the steel structure used in coastal areas has high humidity, and higher requirements are also put on the use of the coating. For example, maintenance of ships and platforms in coastal petroleum and petrochemical steel structures and marine environments often involves high humidity environments, and the steel structure surfaces are in a wet state. In order to ensure the anti-corrosion effect of the anti-corrosion coating under the special coating conditions, the low-surface treatment epoxy coating capable of being coated on the surface of a wet and rusty steel structure is produced, and the coating does not need to carry out complex surface treatment on the steel structure before coating so as to meet the low-surface treatment requirement in actual construction.
The solvent type rusty anticorrosive paint is mainly used at present due to the characteristics of easy volatilization of organic solvents, quick curing and drying of the paint, low cost and the like. But the organic solvent is easy to volatilize in the drying and curing process, so that the problem of environmental pollution is serious.
The water-based rust-containing anticorrosive paint takes water as a solvent, has extremely low solvent content, has low environmental pollution degree and meets the requirement of environmental protection. Therefore, the development of the environment-friendly water-based epoxy anticorrosive paint which can be directly coated on the rusty base material and has excellent adhesive force and good anticorrosive performance is indispensable to the maintenance of old oil tanks, pipelines, steel structures and the like of petrochemical systems, ships and oil platforms; although the existing water-based epoxy coating can be applied to an anticorrosive coating with higher requirement level for surface treatment of a steel structure before coating, the existing water-based epoxy coating has lower requirement level for surface treatment of the steel structure before coating, a rusted base material cannot ensure long-acting corrosion resistance, and a paint film is damaged by impact and cannot be repaired.
Disclosure of Invention
The invention aims to provide a low-surface-treatment water-based epoxy coating and a preparation method thereof, and solves the technical problems that the water-based epoxy anticorrosive coating in the prior art cannot ensure long-acting corrosion resistance and cannot be repaired.
The embodiment of the application discloses a low-surface-treatment water-based epoxy coating, which comprises the following components in parts by weight:
the component A comprises:
45-60 parts of non-ionic water-based epoxy emulsion; 0.5 to 1 part of fumed silica; 0.5 to 1 portion of nano aluminum hydroxide; 0.5-1 part of carbon nano composite material; 2-5 parts of a monofunctional epoxy reactive diluent; 1.5-3 of absolute ethyl alcohol; 1.5-2 parts of a film-forming assistant; 1-2 parts of a dispersant; 0.3-0.5 part of wetting agent; 0.05 to 0.15 portion of defoaming agent; 0.5-1 part of polyurethane thickener; 12-18 parts of deionized water; 5-10 parts of iron oxide red powder; 4-10 parts of zinc phosphate; 4-10 parts of aluminum tripolyphosphate; 2-5 parts of modified aluminum phosphate molecular sieve; 4-10 parts of wet-milled sericite powder; 2-5 parts of water-based epoxy phosphate;
and B component:
8-11 parts of a water-based epoxy curing agent; 45-55 parts of modified waterborne epoxy curing agent; 11-15 parts of propylene glycol methyl ether; 7-9 parts of an anti-flash rust agent; 18 to 22 portions of deionized water.
The embodiment of the invention optimizes and improves the composition of the water-based epoxy coating; the self-repairing function can be realized on the basis of good anti-corrosion performance.
On the basis of the technical scheme, the embodiment of the application can be further improved as follows:
further, the nonionic water-based epoxy emulsion in the component A is bisphenol A modified nonionic water-based epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53%;
the water-based epoxy curing agent in the component B is a water-based epoxy curing agent of an Aradur 38-1 modified polyamine addition product, and the water-based epoxy curing agent has the beneficial effect that the water-based epoxy curing agent can be more tightly combined with the self-repairing microcapsule when a paint film is slightly damaged by adopting a specific curing agent component.
Further, the modified waterborne epoxy curing agent of the component B is an NX-8101 type cashew nut shell oil modified waterborne epoxy curing agent.
Further, the monofunctional epoxy reactive diluent is a monofunctional epoxy reactive diluent NC513 with a Kadar epoxy value of 0.47-0.53 mol/100g and a solid content of 100%.
Further, the average particle size of the nano aluminum hydroxide is 20nm.
Further, the weight ratio of the component A to the component B is 100.
Further, the film-forming aid in the component A is one or two of dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and propylene glycol phenyl ether, the dispersing agent is one or two of a high molecular block copolymer and alkyl polyoxyethylene, the wetting agent is polysiloxane, the defoaming agent is one or two of a silicone defoaming agent and modified mineral oil, and the thickening agent is a polyurethane associated thickening agent.
The application also discloses a preparation method of the low-surface-treatment water-based epoxy coating, which comprises the following steps:
s1: preparing a component A;
step S101: adding the fumed silica, the monofunctional epoxy active diluent, the nano aluminum hydroxide and the carbon nano composite material into the absolute ethyl alcohol, dispersing for 0.5-1.5 h at the stirring speed of 2500-3500 r/min, and then dispersing for 20-40 min by ultrasonic waves to obtain the self-repairing microcapsule epoxy resin;
step S202: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule micro-epoxy resin, the film-forming assistant, the defoamer, the wetting agent, the dispersant and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the normal temperature of 1500-2500 r/min, adding the iron oxide red powder, the zinc phosphate, the aluminum tripolyphosphate, the wet-milled sericite powder and the modified aluminum phosphate molecular sieve under stirring, and continuously stirring at the speed of 1500-2500 r/min for 30-40 min to uniformly disperse the components to obtain a mixture;
step S203: grinding the mixture obtained in the step S202 by a grinder for 0.5-1 hour until the fineness is less than 30 mu m, then adding the polyurethane thickener, and uniformly stirring to obtain the component A;
s2: preparing a component B;
step S201: stirring and dispersing the modified epoxy curing agent, the NX-8101 type cashew nut shell oil modified waterborne epoxy curing agent, the propylene glycol methyl ether, the flash rust preventing agent and the deionized water uniformly to obtain the component B;
s3: and mixing the component A and the component B to obtain the low-surface-treatment water-based epoxy coating.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the composition of the water-based epoxy coating is optimized and improved, the monofunctional epoxy active diluent, the fumed silica, the nano aluminum hydroxide and the carbon nano composite material form a structure similar to a self-repairing microcapsule, the carbon nano composite material has a catalytic effect, and the components have synergistic effects, so that the low-surface-treatment water-based epoxy coating has good corrosion resistance (2000 h, the one-way expansion corrosion at the scratch is less than 2mm, the salt spray resistance of a rusty wet coating reaches 4000 h), and has good self-repairing performance and long-acting corrosion resistance.
2. The cashew nut shell oil modified waterborne epoxy curing agent used in the low-surface-treatment waterborne epoxy coating disclosed by the application has multiple performances of good permeability, lipophilicity and hydrophobicity, so that the obtained coating can be cured on a surface with moisture and has good corrosion resistance.
3. The low-surface-treatment epoxy coating disclosed by the application is also added with the water-based epoxy phosphate, and the water-based epoxy phosphate and the modified aluminum phosphate molecular sieve, the zinc phosphate, the aluminum tripolyphosphate and other antirust pigments have synergistic effects, so that rusted ferric oxide and a mixture thereof are coated, further oxidation reaction of the rusted ferric oxide is prevented, and the long-acting antirust capacity of the coating is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a process step of a method for preparing a low surface treatment waterborne epoxy coating according to an embodiment of the present invention;
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the detailed description.
The low-surface-treatment water-based epoxy coating disclosed by the application is added with a monofunctional epoxy active diluent with 100% solid content, fumed silica, nano aluminum hydroxide and a carbon nano composite material, the epoxy diluent is used as a binder, the nano aluminum hydroxide is used as a bridge suspending agent, and the carbon nano composite material and the fumed silica are combined to form a self-repairing microcapsule with a hard core and a hard shell, wherein the microcapsule is similar to a self-repairing microcapsule.
In the aspect of curing agent, the curing agent compounded by 38-1 modified polyamine adduct curing agent and NX-8101 cashew nut shell oil modified waterborne epoxy curing agent is adopted. The 38-1 modified polyamine adduct curing agent has low viscosity, good fluidity and good permeability; when the paint film is slightly damaged, the self-repairing microcapsule can be more tightly combined with the paint film. The NX-8101 cashew nut shell oil modified water-based curing agent has a benzene ring structure and also has a long carbon chain at the C15 side containing an unsaturated bond, so that the coating can be cured in a low-temperature and humid environment, and the requirement on surface treatment of a substrate is low; and the NX-8101 type cashew nut shell oil modified water-based curing agent and the two curing agents are mixed for use, so that the coating has good self-repairing capability, moisture curing performance and low surface treatment requirement on coated steel.
Compared with the existing coating, the coating is added with the water-based epoxy phosphate. The water-based epoxy phosphate has the characteristics of good miscibility, good water resistance, good chemical resistance and the like, and can adjust the viscosity of the obtained coating and improve the thermal stability of the coating. When the coating is used in a coating, the flexibility of a coating film, the adhesion with a substrate and the long-acting self-repairing anti-corrosion performance can be obviously improved.
In the aspect of antirust pigment, zinc phosphate, aluminum tripolyphosphate and a modified aluminum phosphate molecular sieve are added, so that the long-acting anticorrosion performance of a paint film for coating and passivating rust is improved under the synergistic effect of the zinc phosphate, the aluminum tripolyphosphate and the modified aluminum phosphate molecular sieve.
In addition, other adjuvant components in the low surface treatment epoxy coating of the present invention, such as wetting agents and dispersants, also perform different functions. When the rusty surface is coated, the coating is required to have better substrate wettability, so that the coating can fully wet a rust layer and generate a good sealing effect on the porous rust layer; therefore, an ideal wetting agent is selected to provide proper surface tension for the coating, improve leveling and substrate wetting, and improve the wettability and the apparent performance of the coating film; the wetting agent selected by the application has lower surface tension, and has better functions of preventing shrinkage cavity and wetting a substrate.
Example 1:
the embodiment of the application discloses a low-surface-treatment water-based epoxy coating which can be coated on the surface of a rusty and wet steel structure, and has good self-repairing capability and long-acting antirust performance; the coating comprises the following components in parts by weight:
the component A comprises:
45 parts of a nonionic aqueous epoxy emulsion; 0.5 part of fumed silica; 0.5 part of nano aluminum hydroxide; 0.5 part of a carbon nanocomposite; 2 parts of a monofunctional epoxy reactive diluent; 1.5 absolute ethyl alcohol; 1.5 parts of a film-forming aid; 1 part of a dispersant; 0.3 part of wetting agent; 0.05 part of a defoaming agent; 0.5 part of a polyurethane thickener; 12 parts of deionized water; 5 parts of iron oxide red powder; 4 parts of zinc phosphate; 4 parts of aluminum tripolyphosphate; 2 parts of a modified aluminum phosphate molecular sieve; 4 parts of wet-milled sericite powder; 2 parts of an aqueous epoxy phosphate;
wherein the nonionic water-based epoxy emulsion in the component A is bisphenol A modified nonionic water-based epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53%;
the fumed silica is watt fumed silica HDK H18;
the monofunctional epoxy reactive diluent is a monofunctional epoxy reactive diluent NC513 with a Kadeli epoxy value of 0.47-0.53 mol/100g and a solid content of 100%;
the carbon nano composite material is TNIM190FTNIM190FC of Chengdu chemical company Limited of Chinese academy of sciences;
the film-forming aid is one or two of dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and propylene glycol phenyl ether;
the dispersing agent is one or two of a high-molecular block copolymer and alkyl polyoxyethylene; the wetting agent is polysiloxane;
the defoaming agent is one or two of an organic silicon defoaming agent and modified mineral oil; the thickening agent is a polyurethane associative thickening agent;
the average grain size of the nano aluminum hydroxide is 20nm, and the nano aluminum hydroxide can be nano aluminum hydroxide of Jiaanheng technology;
and the component B comprises:
8 parts of a water-based epoxy curing agent; 45 parts of a modified water-based epoxy curing agent; 11 parts of propylene glycol methyl ether; 7 parts of a flash rust inhibitor; 18 parts of deionized water;
wherein the water-based epoxy curing agent in the component B is a water-based epoxy curing agent of an Aradur 38-1 modified polyamine adduct; the modified waterborne epoxy curing agent is NX-8101 type cashew nut shell oil modified waterborne epoxy curing agent.
In this example, the weight ratio of the component a to the component B is 100:16.
during the production, the component A can be produced firstly, the existing stirring production mode can be adopted, other modes can also be adopted for production, the same mode is adopted for the component B, and then the component A and the component B are stirred to complete the production.
Example 2:
based on example 1, this example was adjusted for the ratio of each component, specifically as follows:
the component A comprises:
60 parts of nonionic water-based epoxy emulsion; 1 part of fumed silica; 1 part of nano aluminum hydroxide; 1 part of a carbon nanocomposite; 5 parts of a monofunctional epoxy reactive diluent; 3, anhydrous ethanol; 2 parts of a film-forming aid; 2 parts of a dispersant; 0.5 part of wetting agent; 0.15 part of a defoaming agent; 1 part of a polyurethane thickener; 18 parts of deionized water; 10 parts of iron oxide red powder; 10 parts of zinc phosphate; 10 parts of aluminum tripolyphosphate; 5 parts of a modified aluminum phosphate molecular sieve; wet grinding 10 parts of sericite powder; 5 parts of an aqueous epoxy phosphate;
and B component:
11 parts of an aqueous epoxy curing agent; 55 parts of a modified water-based epoxy curing agent; 15 parts of propylene glycol methyl ether; 9 parts of a flash rust inhibitor; 22 parts of deionized water.
In this example, the weight ratio of the component a to the component B is 100:17.
during the production, the component A can be produced firstly, the existing stirring production mode can be adopted, other modes can also be adopted for production, the same mode is adopted for the component B, and then the component A and the component B are stirred to complete the production.
Example 3:
based on example 1, the present example was adjusted for the ratio of each component, specifically as follows:
the component A comprises:
46 parts of a nonionic aqueous epoxy emulsion; 0.5 part of fumed silica; 0.6 part of nano aluminum hydroxide; 1 part of a carbon nanocomposite; 5 parts of a monofunctional epoxy reactive diluent; 1.7 parts of absolute ethyl alcohol; 1.5 parts of a film-forming assistant; 1.2 parts of a dispersant; 0.4 part of wetting agent; 0.1 part of a defoaming agent; 1 part of a polyurethane thickener; 14.5 parts of deionized water; 7 parts of iron oxide red powder; 5 parts of zinc phosphate; 5 parts of aluminum tripolyphosphate; 2 parts of a modified aluminum phosphate molecular sieve; 2 parts of an aqueous epoxy phosphate;
and B component:
10 parts of waterborne epoxy curing agent and 50 parts of modified waterborne epoxy curing agent; 12 parts of propylene glycol methyl ether; 7.62 parts of an anti-flash rust agent; 20.2 parts of deionized water.
Specifically, the weight ratio of the component A to the component B is 100:16.67.
during the production, the component A can be produced firstly, the existing stirring production mode can be adopted, other modes can also be adopted for production, the same mode is adopted for the component B, and then the component A and the component B are stirred to complete the production.
Example 4:
as shown in fig. 1, this example discloses a method for preparing a low surface treatment water-based epoxy coating, wherein the specific components and weight ratios of the low surface treatment water-based epoxy coating can adopt the components and weight ratios in example 1, example 2, or example 3, and the method comprises the following steps:
s1: preparing a component A;
step S101: adding the fumed silica, the monofunctional epoxy reactive diluent, the nano aluminum hydroxide and the carbon nano composite material into the absolute ethyl alcohol, dispersing for 0.5h or 1h or 1.5h at a stirring speed of 2500r/min or 3000 r/min or 3500r/min, and then dispersing for 20min or 30min or 40min by ultrasonic waves to obtain self-repairing microcapsule epoxy resin;
step S202: sequentially adding the nonionic water-based epoxy emulsion, the self-repairing microcapsule micro-epoxy resin, the film forming additive, the defoaming agent, the wetting agent, the dispersing agent and the water-based epoxy phosphate into the deionized water phase, uniformly stirring at the normal temperature of 1500r/min or 2000r/min or 2500r/min, adding the iron oxide red powder, the zinc phosphate, the aluminum tripolyphosphate, the wet-milled sericite powder and the modified aluminum phosphate molecular sieve under the stirring condition, and continuously stirring at the speed of 1500r/min or 2000r/min or 2500r/min for 30min or 35 min or 40min to uniformly disperse the components to obtain a mixture;
step S203: grinding the mixture obtained in the step S202 by a grinder for 0.5 hour or 0.75 hour or 1 hour until the fineness is less than 30 mu m, then adding the polyurethane thickener, and uniformly stirring to obtain the component A;
s2: preparing a component B;
step S201: stirring and dispersing the modified epoxy curing agent, the NX-8101 type cashew shell oil modified waterborne epoxy curing agent, the propylene glycol methyl ether, the flash rust preventing agent and the deionized water uniformly to obtain a component B;
s3: and mixing the component A and the component B to obtain the low-surface-treatment water-based epoxy coating.
Wherein, the components and the weight proportion of the embodiment 1 are adopted to obtain a coating A; obtaining a coating B by adopting the components and the weight ratio of the embodiment 2; paint C was obtained using the components and weight ratios of example 3.
Comparative example:
the production of the low surface treatment water-based epoxy coating is carried out according to the following steps:
step 1: 52 parts of bisphenol A modified non-ionic waterborne epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53 percent, film-forming additives (0.5 part of dipropylene glycol methyl ether and 1 part of dipropylene glycol n-butyl ether), 0.1 part of defoaming agent, 0.4 part of wetting agent, 1.2 parts of dispersing agent and 2 parts of waterborne epoxy phosphate are stirred uniformly at the normal temperature of 1500-2500 r/min in sequence in 14.5 parts of deionized water phase, 7 parts of iron oxide red powder, 5 parts of zinc phosphate, 5 parts of aluminum tripolyphosphate and 9 parts of wet-grinding sericite powder and 2 parts of modified aluminum phosphate molecular sieve are added under the stirring condition and stirred for 30-40 min at the speed of 1500-2500 r/min continuously to ensure that all components are dispersed uniformly;
step 2: grinding the mixture obtained in the step (1) by a grinder for 0.5-1 hour until the fineness is less than 30 mu m;
and step 3: adding 1 part of polyurethane thickener into the step (4) with the mixture fineness of less than 30 mu m, and uniformly stirring to obtain a component A of the low-surface-treatment water-based epoxy coating;
and 4, step 4: stirring and dispersing 10 parts of Aradur 38-1 modified epoxy curing agent, 50 parts of NX-8101 cashew nut shell oil modified waterborne epoxy curing agent, 12 parts of propylene glycol methyl ether, 7.62 parts of anti-flash rust agent and 20.2 parts of deionized water uniformly to obtain a component B of the low-surface-treatment epoxy coating;
step 5, mixing the component A and the component B according to the proportion of 100:16.67 and evenly mixing to obtain the low surface treatment water-based epoxy coating, namely coating D.
The properties of the various coatings and coatings are given in the following table:
as can be seen from the data in Table 1, coating C had the best self-healing value R of 59%. The low-surface-treatment water-based epoxy coating can be coated on the surface of rusty (St 2.5 grade) and wet steel, and has good moisture curing performance and good adhesion with a rusty steel plate. The obtained coating has good self-repairing performance, and the problem of further corrosion when a paint film of the low-surface treatment water-based epoxy coating in the prior art is damaged is effectively solved. The coating can be applied to the outdoor corrosion prevention of steel structures and the maintenance of petrochemical storage tanks. Meanwhile, the coating also has excellent scratch corrosion spread resistance and salt spray resistance, which shows that the corrosion resistance of the coating can be improved by the synergistic effect of the added corrosion-inhibiting pigment filler zinc phosphate, the aluminum tripolyphosphate, the modified aluminum phosphate and the water-based epoxy phosphate.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.
Claims (8)
1. The low-surface-treatment water-based epoxy coating is characterized by comprising the following components in parts by weight:
the component A comprises:
45-60 parts of non-ionic water-based epoxy emulsion; 0.5 to 1 part of fumed silica; 0.5 to 1 portion of nano aluminum hydroxide; 0.5-1 part of carbon nano composite material; 2-5 parts of a monofunctional epoxy reactive diluent; 1.5-3 parts of absolute ethyl alcohol; 1.5-2 parts of a film-forming assistant; 1-2 parts of a dispersant; 0.3-0.5 part of wetting agent; 0.05-0.15 part of defoaming agent; 0.5-1 part of polyurethane thickener; 12-18 parts of deionized water; 5-10 parts of iron oxide red powder; 4-10 parts of zinc phosphate; 4-10 parts of aluminum tripolyphosphate; 2-5 parts of modified aluminum phosphate molecular sieve; 4-10 parts of wet-milled sericite powder; 2-5 parts of water-based epoxy phosphate;
and the component B comprises:
8-11 parts of a water-based epoxy curing agent; 45-55 parts of modified waterborne epoxy curing agent; 11-15 parts of propylene glycol methyl ether; 7-9 parts of an anti-flash rust agent; 18 to 22 portions of deionized water.
2. The low surface treatment water-based epoxy coating material according to claim 1, wherein the non-ionic water-based epoxy emulsion in the component A is a bisphenol A modified non-ionic water-based epoxy emulsion having an epoxy value of 0.10mol/100g and a solid content of 53%;
the water-based epoxy curing agent in the component B is a water-based epoxy curing agent of an Aradur 38-1 modified polyamine adduct.
3. The low surface treatment water-based epoxy coating as claimed in claim 2, wherein the modified water-based epoxy curing agent of the component B is NX-8101 type cashew nut shell oil modified water-based epoxy curing agent.
4. The low-surface-treatment water-based epoxy coating material as claimed in claim 3, wherein the monofunctional epoxy reactive diluent is a monofunctional epoxy reactive diluent NC513 having a Kandeley epoxy value of 0.47-0.53 mol/100g and a solid content of 100%.
5. The low surface treatment water-based epoxy coating according to claim 4, wherein the nano aluminum hydroxide has an average particle size of 20nm.
6. The low-surface-treatment water-based epoxy coating material according to claim 5, wherein the weight ratio of the component A to the component B is 100.
7. The low surface treatment aqueous epoxy paint according to claim 6, wherein the film forming aid in the A component is one or two of dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and propylene glycol phenyl ether, the dispersant is one or two of a high molecular block copolymer and an alkyl polyoxyethylene, the wetting agent is polysiloxane, the antifoaming agent is one or two of a silicone antifoaming agent and a modified mineral oil, and the thickener is a polyurethane associative thickener.
8. A method for preparing the low surface treatment water-based epoxy coating material according to any one of claims 1 to 7, characterized by comprising the steps of:
s1: preparing a component A;
step S101: adding the fumed silica, the monofunctional epoxy active diluent, the nano aluminum hydroxide and the carbon nano composite material into the absolute ethyl alcohol, dispersing for 0.5-1.5 h at a stirring speed of 2500-3500 r/min, and then dispersing for 20-40 min by ultrasonic waves to obtain self-repairing microcapsule epoxy resin;
step S202: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule micro-epoxy resin, the film-forming assistant, the defoamer, the wetting agent, the dispersant and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the normal temperature of 1500-2500 r/min, adding the iron oxide red powder, the zinc phosphate, the aluminum tripolyphosphate, the wet-milled sericite powder and the modified aluminum phosphate molecular sieve under stirring, and continuously stirring at the speed of 1500-2500 r/min for 30-40 min to uniformly disperse the components to obtain a mixture;
step S203: grinding the mixture obtained in the step S202 by a grinder for 0.5-1 hour until the fineness is less than 30 mu m, then adding the polyurethane thickener, and uniformly stirring to obtain the component A;
s2: preparing a component B;
step S201: stirring and dispersing the modified epoxy curing agent, the modified waterborne epoxy curing agent, the propylene glycol methyl ether, the flash rust inhibitor and the deionized water uniformly to obtain the component B;
s3: and mixing the component A and the component B to obtain the low-surface-treatment water-based epoxy coating.
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