CN115895400B - Low-surface-treatment water-based epoxy paint and preparation method thereof - Google Patents
Low-surface-treatment water-based epoxy paint and preparation method thereof Download PDFInfo
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- CN115895400B CN115895400B CN202211483741.0A CN202211483741A CN115895400B CN 115895400 B CN115895400 B CN 115895400B CN 202211483741 A CN202211483741 A CN 202211483741A CN 115895400 B CN115895400 B CN 115895400B
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- 239000004593 Epoxy Substances 0.000 title claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000003973 paint Substances 0.000 title claims abstract description 41
- 238000004381 surface treatment Methods 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000008367 deionised water Substances 0.000 claims abstract description 21
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 21
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims abstract description 20
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 18
- 239000003085 diluting agent Substances 0.000 claims abstract description 18
- 229920006334 epoxy coating Polymers 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 239000002562 thickening agent Substances 0.000 claims abstract description 17
- 239000000080 wetting agent Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 239000002114 nanocomposite Substances 0.000 claims abstract description 16
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 15
- 239000010452 phosphate Substances 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 15
- 239000004814 polyurethane Substances 0.000 claims abstract description 15
- 229920002635 polyurethane Polymers 0.000 claims abstract description 15
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 15
- 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 15
- 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 15
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 15
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical class O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 11
- 239000002808 molecular sieve Substances 0.000 claims abstract description 11
- 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 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003112 inhibitor Substances 0.000 claims abstract description 9
- 238000001238 wet grinding Methods 0.000 claims abstract description 5
- 238000001723 curing Methods 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 13
- 239000003094 microcapsule Substances 0.000 claims description 12
- 229960005191 ferric oxide Drugs 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000013530 defoamer Substances 0.000 claims description 6
- 239000004848 polyfunctional curative Substances 0.000 claims description 6
- -1 polyoxyethylene Polymers 0.000 claims description 6
- 238000000227 grinding Methods 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
- 238000002156 mixing Methods 0.000 claims description 4
- 239000007787 solid Substances 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
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 229920001400 block copolymer Polymers 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 35
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 description 31
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 238000005260 corrosion Methods 0.000 description 15
- 239000003921 oil Substances 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 12
- 244000226021 Anacardium occidentale Species 0.000 description 9
- 235000020226 cashew nut Nutrition 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 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 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 229920000768 polyamine Polymers 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000049 pigment Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000013008 moisture curing Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 235000012773 waffles Nutrition 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 (3) a component A: a nonionic aqueous epoxy emulsion; fumed silica; nano aluminum hydroxide; a carbon nanocomposite; a monofunctional epoxy reactive diluent; absolute ethyl alcohol; a film forming aid; a dispersing agent; a wetting agent; a defoaming agent; a polyurethane thickener; deionized water; iron oxide red powder; zinc phosphate; aluminum tripolyphosphate; modified aluminum phosphate molecular sieves; wet milling sericite powder; aqueous epoxy phosphate; and the component B comprises the following components: a waterborne epoxy curing agent; a modified aqueous epoxy curing agent; propylene glycol methyl ether; a flash rust inhibitor; deionized water. The invention solves the technical problems that the water-based epoxy anticorrosive paint in the prior art cannot guarantee long-acting corrosion prevention 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 grade of the surface treatment requirement of the steel structure before coating. In the corrosion-proof coating of steel structures, in order to ensure the corrosion-proof quality of the coating, the steel needs to be thoroughly sand-blasted and pre-treated, and the Sa2.5 grade (GB/T8923, rust-removing grade and rust-removing grade of the surface of the steel before coating) is usually required. However, for some old projects, such as old oil tanks, pipelines, steel structures and the like of petrochemical systems, and ships and oil platforms, the surface rust of the steel structures on the maintenance work site is serious, the site sand blasting and rust removal are limited by conditions, and the rust removal quality cannot meet the technical requirement of Sa2.5 grade due to the technical quality of constructors and other various reasons, so that the corrosion prevention quality cannot be ensured. In addition, the surface humidity of the steel structure used in coastal areas is high, and higher requirements are also put on the use of the paint. For example, maintenance of ships and platforms in coastal petrochemical steel structures and marine environments is often performed in a high humidity environment, and the surfaces of the steel structures are in a wet state. In order to ensure the anti-corrosion effect of the anti-corrosion coating under the special coating condition, a low-surface treatment epoxy coating capable of being coated on the surface of a wet and rusted steel structure is generated, 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 practical construction.
Because of the characteristics of easy volatilization of organic solvents, quick curing and drying of the paint, low cost and the like in solvent type rust-bearing anticorrosive paint, the solvent type rust-bearing anticorrosive paint is still mainly used at present. However, 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-carrying anticorrosive paint uses water as a solvent, has extremely low solvent content and low environmental pollution degree, and meets the environmental protection requirement. Therefore, development of an environment-friendly aqueous epoxy anticorrosive paint which can be directly painted on a rusted substrate and has excellent adhesive force and good anticorrosive performance is indispensable for maintenance of old oil tanks, pipelines, steel structures and the like of petrochemical systems, ships and oil platforms; the existing water-based epoxy paint can be applied to anticorrosive paint with higher surface treatment requirement level on a steel structure before coating, but the rust-bearing base material with lower surface treatment requirement level on the steel structure before coating cannot guarantee 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 paint and a preparation method thereof, and solves the technical problems that the water-based epoxy anticorrosive paint in the prior art cannot guarantee long-term 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:
and (3) a component A:
45-60 parts of nonionic aqueous epoxy emulsion; 0.5 to 1 part of fumed silica; 0.5 to 1 part of nano aluminum hydroxide; 0.5 to 1 part of carbon nano composite material; 2-5 parts of monofunctional epoxy reactive diluent; 1.5 to 3 absolute ethyl alcohol; 1.5-2 parts of film forming additive; 1-2 parts of dispersing agent; 0.3 to 0.5 part of wetting agent; 0.05 to 0.15 part of defoamer; 0.5 to 1 part of polyurethane thickener; 12-18 parts of deionized water; 5-10 parts of ferric 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-milling sericite powder; 2-5 parts of water-based epoxy phosphate;
and the component B comprises the following components:
8-11 parts of aqueous epoxy curing agent; 45-55 parts of modified waterborne epoxy curing agent; 11-15 parts of propylene glycol methyl ether; 7-9 parts of flash rust inhibitor; 18-22 parts of deionized water.
The embodiment of the invention optimizes and improves the composition of the water-based epoxy paint; the self-repairing function can be realized on the basis of good corrosion resistance.
Based on the above technical solution, the embodiment of the present application may further be modified as follows:
further, the nonionic aqueous epoxy emulsion in the component A is bisphenol A modified nonionic aqueous epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53%;
the aqueous epoxy curing agent in the component B is an aqueous epoxy curing agent of an Aradur 38-1 modified polyamine adduct, and the beneficial effect of the step is that the aqueous epoxy curing agent can be more tightly combined with the self-repairing microcapsule when a paint film is subjected to micro-damage through a specific curing agent component.
Further, the modified aqueous epoxy hardener of the component B is NX-8101 type cashew nut shell oil modified aqueous epoxy hardener.
Further, the monofunctional epoxy reactive diluent is NC513.
Further, the average particle diameter of the nano aluminum hydroxide is 20nm.
Further, the weight ratio of the component A to the component B is 100:16-17.
Further, the film forming auxiliary agent 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 an organosilicon defoaming agent and modified mineral oil, and the thickening agent is a polyurethane association type thickening agent.
The application also discloses a preparation method of the low-surface-treatment water-based epoxy paint, which comprises the following steps:
s1: preparing a component A;
step S101: adding the fumed silica, the monofunctional epoxy reactive diluent, the nanometer aluminum hydroxide and the carbon nanocomposite 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 self-repairing microcapsule epoxy resin;
step S102: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule epoxy resin, the film-forming auxiliary agent, the defoaming agent, the wetting agent, the dispersing agent and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the speed of 1500-2500 r/min, adding the ferric oxide red powder, the zinc phosphate and the aluminum tripolyphosphate under the stirring condition, continuously stirring at the speed of 1500-2500 r/min for 30-40 min to uniformly disperse all components, and obtaining a mixture;
step S103: grinding the mixture obtained in the step S102 for 0.5-1 hour by a grinder 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;
uniformly stirring and dispersing the modified epoxy curing agent, the NX-8101 cashew nut shell oil modified waterborne epoxy curing agent, the propylene glycol methyl ether, the flash rust inhibitor and the deionized water 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.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. the composition of the water-based epoxy paint is optimized and improved, a monofunctional epoxy reactive diluent, fumed silica, nanometer aluminum hydroxide and a carbon nanocomposite form a structure similar to a self-repairing microcapsule, and the carbon nanocomposite has the catalysis effect, so that the obtained low-surface-treatment water-based epoxy paint coating has good corrosion resistance (2000 h, unidirectional corrosion at a scratch is less than 2mm, and the salt fog resistance of the wet coating with rust is 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 properties of good permeability, lipophilicity and hydrophobicity, so that the obtained coating can be cured on a wet surface with water and has good anti-corrosion property.
3. The low-surface-treatment epoxy paint disclosed by the application is also added with water-based epoxy phosphate, and the water-based epoxy phosphate is synergistic with modified aluminum phosphate molecular sieve, zinc phosphate, aluminum tripolyphosphate and other antirust pigments, so that rusted ferric oxide and a mixture thereof are coated, further oxidation reaction is prevented, and the long-acting antirust capability 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 shows the steps of a method for preparing a low surface treatment waterborne epoxy coating according to an embodiment of the invention;
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
The low-surface-treatment water-based epoxy paint disclosed by the application is added with a monofunctional epoxy reactive diluent, fumed silica, nano aluminum hydroxide and a carbon nano composite material, wherein 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 core-soft shell hard self-repairing microcapsule.
In terms of curing agents, the application adopts a curing agent compounded by a 38-1 modified polyamine adduct curing agent and an NX-8101 cashew nut shell oil modified waterborne epoxy curing agent. The 38-1 modified polyamine adduct curing agent has low viscosity, good fluidity and good permeability; when the paint film is destroyed by micro, the paint film can be more tightly combined with the self-repairing microcapsule. The NX-8101 cashew nut shell oil modified water-based curing agent has a benzene ring structure and a C15 side long carbon chain containing unsaturated bonds, so that the coating can be cured in a low-temperature and humid environment, and the surface treatment requirement on a substrate is low; and the mixed use of the two curing agents of the NX-8101 type cashew nut shell oil modified water-based curing agent ensures that the paint has good self-repairing capability, moisture curing performance and low surface treatment requirement on coated steel.
Compared with the existing paint, the paint provided by the application is added with 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. The coating can obviously improve the flexibility of the coating, the adhesion with a substrate and the long-acting corrosion resistance of self-repairing when used in the coating.
In the aspect of antirust pigment, zinc phosphate, aluminum tripolyphosphate and modified aluminum phosphate molecular sieve are added, and under the synergistic effect of the zinc phosphate, the aluminum tripolyphosphate and the modified aluminum phosphate molecular sieve, the long-acting corrosion resistance of the paint film to rust coating and passivation is improved.
In addition, other auxiliary components in the low surface treatment epoxy coating, such as wetting agents and dispersants, also play different roles. Because the paint is required to have better substrate wettability when the surface with rust is coated, the paint can fully wet the rust layer and has good sealing effect on the porous rust layer; therefore, it is necessary to select an ideal wetting agent to give proper surface tension to the coating, improve leveling and substrate wetting, and improve wettability and apparent properties 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 the 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 rusted 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:
and (3) a component A:
45 parts of nonionic aqueous epoxy emulsion; 0.5 part of fumed silica; 0.5 part of nano aluminum hydroxide; 0.5 parts of a carbon nanocomposite; 2 parts of a monofunctional epoxy reactive diluent; 1.5 absolute ethyl alcohol; 1.5 parts of a film forming auxiliary; 1 part of dispersing agent; 0.3 parts of wetting agent; 0.05 parts of defoamer; 0.5 parts of polyurethane thickener; 12 parts of deionized water; 5 parts of ferric oxide red powder; 4 parts of zinc phosphate; 4 parts of aluminum tripolyphosphate; 2 parts of modified aluminum phosphate molecular sieve; 4 parts of wet-milling sericite powder; 2 parts of aqueous epoxy phosphate;
wherein the nonionic aqueous epoxy emulsion in the component A is bisphenol A modified nonionic aqueous epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53%;
the fumed silica is a waffle fumed silica HDK H18;
the monofunctional epoxy reactive diluent is a cadley epoxy reactive diluent NC513;
the carbon nano composite material is TNIM190F and TNIM190FC of Chengdu organic chemistry Co., ltd;
the film forming additive 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 organic silicon defoaming agents and modified mineral oil; the thickener is polyurethane association type thickener;
the average grain diameter of the nano aluminum hydroxide is 20nm, and the nano aluminum hydroxide can be nano aluminum hydroxide of a technology of Jia An Heng;
and the component B comprises the following components:
8 parts of an aqueous epoxy curing agent; 45 parts of modified aqueous epoxy curing agent; 11 parts of propylene glycol methyl ether; 7 parts of flash rust inhibitor; 18 parts of deionized water;
wherein the aqueous epoxy curing agent in the component B is an aqueous epoxy curing agent of an Aradur 38-1 modified polyamine adduct; the modified aqueous epoxy hardener is NX-8101 cashew nut shell oil modified aqueous epoxy hardener.
The weight ratio of the component A to the component B in this example is 100:16.
during the preparation, the component A can be prepared firstly, the existing stirring production mode can be adopted, the component B can be produced in other modes, the same mode is adopted, and then the component A and the component B are stirred to finish the production.
Example 2:
based on example 1, this example was adjusted for the proportions of the components, as follows:
and (3) a component A:
60 parts of nonionic aqueous 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 absolute ethyl alcohol; 2 parts of film forming auxiliary agent; 2 parts of dispersing agent; 0.5 parts of wetting agent; 0.15 parts of defoamer; 1 part of polyurethane thickener; 18 parts of deionized water; 10 parts of ferric oxide red powder; 10 parts of zinc phosphate; 10 parts of aluminum tripolyphosphate; 5 parts of modified aluminum phosphate molecular sieve; 10 parts of wet-milling sericite powder; 5 parts of aqueous epoxy phosphate;
and the component B comprises the following components:
11 parts of an aqueous epoxy curing agent; 55 parts of modified waterborne epoxy curing agent; 15 parts of propylene glycol methyl ether; 9 parts of flash rust inhibitor; 22 parts of deionized water.
The weight ratio of the component A to the component B in this example is 100:17.
during the preparation, the component A can be prepared firstly, the existing stirring production mode can be adopted, the component B can be produced in other modes, the same mode is adopted, and then the component A and the component B are stirred to finish the production.
Example 3:
based on example 1, this example was adjusted for the proportions of the components, as follows:
and (3) a component A:
46 parts of 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 auxiliary; 1.2 parts of a dispersing agent; 0.4 parts of wetting agent; 0.1 part of defoamer; 1 part of polyurethane thickener; 14.5 parts of deionized water; 7 parts of ferric oxide red powder; 5 parts of zinc phosphate; 5 parts of aluminum tripolyphosphate; 2 parts of modified aluminum phosphate molecular sieve; 2 parts of aqueous epoxy phosphate;
and the component B comprises the following components:
10 parts of aqueous epoxy curing agent and 50 parts of modified aqueous epoxy curing agent; 12 parts of propylene glycol methyl ether; 7.62 parts of flash rust inhibitor; 20.2 parts of deionized water.
Specifically, the weight ratio of the component A to the component B is 100:16.67.
during the preparation, the component A can be prepared firstly, the existing stirring production mode can be adopted, the component B can be produced in other modes, the same mode is adopted, and then the component A and the component B are stirred to finish the production.
Example 4:
as shown in fig. 1, this embodiment discloses a method for preparing a low surface treatment aqueous epoxy coating, wherein specific components and weight ratios of the low surface treatment aqueous epoxy coating may be adopted in embodiment 1, embodiment 2 or embodiment 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 nanometer aluminum hydroxide and the carbon nanocomposite into the absolute ethyl alcohol, dispersing for 0.5h or 1h or 1.5h at a stirring speed of 2500r/min or 3000r/min or 3500r/min, and then dispersing for 20min or 30min or 40min by ultrasonic waves to obtain self-repairing microcapsule epoxy resin;
step S102: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule epoxy resin, the film-forming auxiliary agent, the defoaming agent, the wetting agent, the dispersing agent and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the speed of 1500r/min or 2000r/min or 2500r/min, adding the ferric oxide red powder under the stirring condition, and continuously stirring the zinc phosphate, the aluminum tripolyphosphate, the wet-milled sericite powder and the modified aluminum phosphate molecular sieve at the speed of 1500r/min or 2000r/min or 2500r/min for 30min or 35min or 40min to uniformly disperse all the components to obtain a mixture;
step S103: grinding the mixture obtained in the step S102 for 0.5 hour or 0.75 hour or 1 hour by a grinder 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;
uniformly stirring and dispersing the modified epoxy curing agent, the NX-8101 cashew nut shell oil modified waterborne epoxy curing agent, the propylene glycol methyl ether, the flash rust inhibitor and the deionized water 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 weight proportion of the example 1 are adopted to obtain a coating A; coating B was obtained using the components and weight proportions of example 2; coating C was obtained using the components and weight proportions of example 3.
Comparative example:
the production of the low surface treatment water-based epoxy paint is carried out according to the following steps:
step 1: 52 parts of bisphenol A modified nonionic aqueous epoxy emulsion with an epoxy value of 0.10mol/100g and a solid content of 53% and film forming auxiliary agent (dipropylene glycol methyl ether 0.5 parts, dipropylene glycol n-butyl ether 1 parts), 0.1 part of defoamer, 0.4 part of wetting agent and 1.2 parts of dispersing agent are stirred uniformly in a deionized water phase at a speed of 1500-2500 r/min in sequence, 7 parts of ferric oxide red powder, 5 parts of zinc phosphate, 5 parts of aluminum tripolyphosphate and 9 parts of wet-milled sericite powder are added under the stirring condition, and 2 parts of modified aluminum phosphate molecular sieve are stirred continuously for 30-40 min at a speed of 1500-2500 r/min, so that the components are dispersed uniformly;
step 2: grinding the mixture obtained in the step (1) for 0.5-1 hour by a grinder until the fineness is less than 30 mu m;
step 3: adding 1 part of polyurethane thickener into the mixture with fineness less than 30 mu m in the step (4), and uniformly stirring to obtain a component A of the low-surface-treatment water-based epoxy paint;
step 4: 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 are stirred and dispersed uniformly to obtain a component B of the low-surface-treatment epoxy coating;
step 5, the component A and the component B are mixed according to the proportion of 100: and (3) uniformly mixing the materials to obtain the low-surface-treatment water-based epoxy paint, namely paint D.
The properties of the various coatings and their coatings are shown in the following table:
as can be seen from the data in Table 1, paint C preferably has a self-healing value R of up to 59%. The low-surface-treatment water-based epoxy paint can be coated on the surfaces of rusted (St 2.5 grade) and wet steel, and has good moisture curing performance and good adhesive force with the rusted steel plate. The obtained coating has good self-repairing performance, and effectively solves the further corrosion problem when the paint film of the low-surface-treatment water-based epoxy paint in the prior art is damaged. The coating can be applied to outdoor corrosion prevention of steel structures and maintenance of petrochemical storage tanks. Meanwhile, the coating also has excellent scratch and corrosion spreading resistance and salt fog resistance, which indicates that the synergistic effect of the added corrosion inhibition pigment filler zinc phosphate, aluminum tripolyphosphate, modified aluminum phosphate and water-based epoxy phosphate can improve the corrosion resistance of the coating.
In the description of the present invention, numerous specific details are set forth. However, it is understood 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 present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (6)
1. The low-surface-treatment water-based epoxy paint is characterized by comprising the following components in parts by weight:
and (3) a component A:
45-60 parts of nonionic aqueous epoxy emulsion; 0.5 to 1 part of fumed silica; 0.5 to 1 part of nano aluminum hydroxide; 0.5 to 1 part of carbon nano composite material; 2-5 parts of monofunctional epoxy reactive diluent; 1.5-3 parts of absolute ethyl alcohol; 1.5-2 parts of film forming additive; 1-2 parts of dispersing agent; 0.3 to 0.5 part of wetting agent; 0.05 to 0.15 part of defoamer; 0.5 to 1 part of polyurethane thickener; 12-18 parts of deionized water; 5-10 parts of ferric 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-milling sericite powder; 2-5 parts of water-based epoxy phosphate;
and the component B comprises the following components:
8-11 parts of aqueous epoxy curing agent; 45-55 parts of modified waterborne epoxy curing agent; 11-15 parts of propylene glycol methyl ether; 7-9 parts of flash rust inhibitor; 18-22 parts of deionized water;
the monofunctional epoxy reactive diluent is a cadley epoxy reactive diluent NC513;
the carbon nano composite material is TNIM190F and TNIM190FC of Chengdu organic chemistry Co., ltd;
the component A is prepared by the following steps: step S101: adding the fumed silica, the monofunctional epoxy reactive diluent, the nanometer aluminum hydroxide and the carbon nanocomposite 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 self-repairing microcapsule epoxy resin;
step S102: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule epoxy resin, the film-forming auxiliary agent, the defoaming agent, the wetting agent, the dispersing agent and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the speed of 1500-2500 r/min, adding the ferric oxide red powder, the zinc phosphate and the aluminum tripolyphosphate under the stirring condition, continuously stirring at the speed of 1500-2500 r/min for 30-40 min to uniformly disperse all components, and obtaining a mixture;
step S103: grinding the mixture obtained in the step S102 for 0.5-1 hour by a grinder until the fineness is less than 30 mu m, then adding the polyurethane thickener, and uniformly stirring to obtain the component A;
the aqueous epoxy curing agent in the component B is an Aradur 38-1 aqueous epoxy curing agent;
the modified aqueous epoxy hardener of the component B is NX-8101 type modified aqueous epoxy hardener.
2. The low surface treatment aqueous epoxy coating according to claim 1, wherein the nonionic aqueous epoxy emulsion in the a-component is a bisphenol a modified nonionic aqueous epoxy emulsion having an epoxy value of 0.10mol/100g and a solid content of 53%.
3. The low surface treatment aqueous epoxy coating according to claim 2, characterized in that the average particle diameter of the nano aluminum hydroxide is 20nm.
4. The low surface treatment aqueous epoxy coating according to claim 3, wherein the weight ratio of the A component to the B component is 100:16-17.
5. The low surface treatment aqueous epoxy coating according to claim 4, wherein the film forming auxiliary agent in the a component 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 organosilicon defoaming agent and modified mineral oil, and the polyurethane thickener is a polyurethane association type thickener.
6. A method for preparing the low surface treatment aqueous epoxy paint according to any one of claims 1 to 5, comprising the steps of:
s1: preparing a component A;
step S101: adding the fumed silica, the monofunctional epoxy reactive diluent, the nanometer aluminum hydroxide and the carbon nanocomposite 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 self-repairing microcapsule epoxy resin;
step S102: sequentially adding the nonionic aqueous epoxy emulsion, the self-repairing microcapsule epoxy resin, the film-forming auxiliary agent, the defoaming agent, the wetting agent, the dispersing agent and the aqueous epoxy phosphate into the deionized water phase, uniformly stirring at the speed of 1500-2500 r/min, adding the ferric oxide red powder, the zinc phosphate and the aluminum tripolyphosphate under the stirring condition, continuously stirring at the speed of 1500-2500 r/min for 30-40 min to uniformly disperse all components, and obtaining a mixture;
step S103: grinding the mixture obtained in the step S102 for 0.5-1 hour by a grinder 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;
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 a 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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