CN111925695A - Special anticorrosive wear-resistant coating for heat exchanger and preparation method thereof - Google Patents
Special anticorrosive wear-resistant coating for heat exchanger and preparation method thereof Download PDFInfo
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- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
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- C08K3/22—Oxides; Hydroxides of metals
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Abstract
The invention belongs to the technical field of heat exchanger protection, and particularly relates to an anticorrosive wear-resistant coating special for a heat exchanger and a preparation method thereof. The special anticorrosive wear-resistant coating for the heat exchanger comprises fluorocarbon resin, epoxy resin, an anticorrosive reinforcing agent, a wetting dispersant, a defoaming agent, a leveling agent, pigment and a bacteriostatic agent, wherein the fluorocarbon resin and the epoxy resin are used for forming a protective film, the addition of the fluorocarbon resin can ensure that the paint film has lower surface energy besides the obvious improvement of the glossiness and the aging resistance of the paint film, the prepared paint film has stronger hydrophobicity, and the addition of the epoxy resin can improve the mechanical property and the corrosion resistance of the paint film. N atoms in the corrosion-resistant reinforcing agent tetrafluoroindole can be coordinated with metal copper, iron and the like to form a compact protective layer, the hydrophobicity of F atoms can further enhance the corrosion-resistant effect, and the bacteriostatic agent is nano silver and quaternary ammonium salt, so that the prepared paint film has stable antibacterial and bacteriostatic properties.
Description
Technical Field
The invention belongs to the technical field of heat exchanger protection, and particularly relates to an anticorrosive wear-resistant coating special for a heat exchanger and a preparation method thereof.
Background
The heat exchanger is an indispensable device in the production process in the coal field, the petroleum industry, the salt industry and the thermoelectric field, and is directly related to the production benefit of enterprises. In the production process, because the medium of the heat exchanger of the chemical equipment has the characteristics of strong corrosivity, high flow rate, high temperature and high pressure, diversified forms and the like, and the contacted substance components are complex, the heat exchanger is easy to corrode and leak, and the normal use and the stable production of the heat exchanger are influenced. The corrosion of the heat exchanger not only can affect the strength and the service property of the material, but also can cause the whole operation failure of heat exchange and exchange, and cause material damage and economic loss. Once mechanical equipment is damaged, the appearance, color and performance of the equipment are greatly changed, and the corrosion repair work of the equipment brings great extra expenditure to enterprises and influences the production cost and the economic benefit of the enterprises. Therefore, the analysis of the corrosion phenomenon of the heat exchanger of the chemical equipment must be enhanced, corrosion prevention measures are made in advance, the corrosion of the heat exchanger is avoided, and the heat exchanger can be produced normally and orderly under complex conditions.
The main problem of corrosion generated in the heat exchanger of chemical equipment is that the stability of substances on the inner wall of the heat exchanger is damaged due to physical and chemical reactions generated in the contact process of metal substances and the surface of a medium, so that the corrosion problem is caused. Wherein, the physical reaction mainly comprises the following steps: in the normal working process of the heat exchanger, the relative movement speed of the metal component and the corrosive medium is high, and the surface of the metal component is easily corroded and damaged, wherein the corrosion type is also called as surface abrasion corrosion of the heat exchanger. Corrosive gaseous media, liquid media or gases containing gas bubbles, as well as particles containing solids, etc., are all fluid media that cause corrosion damage. In a certain sense, the corrosive wear is the comprehensive influence of the scouring action of high-speed fluid on the metal surface on corrosion products generated by the high-speed fluid and the surface corrosion action of an exposed area, and the worn corrosion can erode the corroded surface and simultaneously cause new corrosion on the newly exposed metal surface to further damage equipment.
The chemical reaction is mainly embodied in electrochemical corrosion, the high-speed fluid in the heat exchanger can avoid the sedimentation and hardening of the fluid, but a certain medium sedimentation condition can occur in the long-term use process, and particularly in the area near the end of work, the medium flow speed is reduced, and more sediments can be deposited in the heat exchange tube. Under the influence of the flow rate in the tube and the property of the deposit, the deposit is unevenly distributed on the surface of the heat exchange tube, the adhesion is not firm, gaps and cracks are easy to form, the oxygen content in the gaps of the deposit is different from that in the gaps, and electrochemical corrosion of partial positions is caused. At the same time, the presence of corrosion products leads to electrochemical inhomogeneities inside and outside the slot, which causes greater corrosion.
The method is an effective method for avoiding the direct contact of the metal surface and a corrosive medium, and is the most economic method. Therefore, the special anticorrosive wear-resistant coating for the heat exchanger has great research value and economic value.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention mainly aims to provide the special anticorrosive wear-resistant coating for the heat exchanger.
The invention also aims to provide a preparation method of the special anticorrosive wear-resistant coating for the heat exchanger.
The invention further aims to provide application of the special anticorrosive wear-resistant coating for the heat exchanger.
The purpose of the invention is realized by the following technical scheme:
the anticorrosive wear-resistant coating special for the heat exchanger comprises a component A and a component B, wherein the component A comprises the following components in percentage by weight:
the component B is a curing agent;
the dosage of the component B is 0.08-0.15 time of the total mass of the fluorocarbon resin and the epoxy resin;
the fluorocarbon resin is preferably fluorocarbon resin GK-570;
the epoxy resin is preferably bisphenol A type epoxy resin;
the bisphenol A epoxy resin is preferably at least one of E42, E44 and E51;
the corrosion-resistant reinforcing agent is tetrafluoroindole, and the structural formula of the corrosion-resistant reinforcing agent is shown as follows:
the wetting dispersant is preferably AT least one of BYK-180, AT-203 and EFKA-4010;
the defoaming agent is preferably at least one of BYK-A530, BYK-024 and BYK-054;
the leveling agent is preferably at least one of BYK-306, BYK-333 and TEGO-432;
the curing agent is preferably at least one of an isocyanate curing agent and an amine curing agent;
the pigment is preferably at least one of aluminum tripolyphosphate, zinc phosphate, zinc borate, titanium dioxide, precipitated barium sulfate, talcum powder, mica iron oxide and aluminum oxide;
the bacteriostatic agent is at least one of nano silver and quaternary ammonium salt;
the preparation method of the special anticorrosive wear-resistant coating for the heat exchanger comprises the following steps:
(1) the components of the special anticorrosive wear-resistant coating for the heat exchanger, namely fluorocarbon resin, epoxy resin, wetting dispersant, defoamer, flatting agent and water are mixed and uniformly dispersed under the condition of low-speed stirring; then adding pigment, anti-corrosion reinforcing agent and bacteriostatic agent, uniformly dispersing under the condition of high-speed stirring, and sanding to obtain a component A for later use;
(2) mixing the component A and the component B according to a ratio to obtain the special anticorrosive wear-resistant coating for the heat exchanger;
the low-speed stirring condition in the step (1) is preferably that the low-speed stirring condition is sealed stirring at a rotating speed of 300-600 rpm for 10-20 min;
the high-speed stirring condition in the step (2) is preferably that the sealing stirring is carried out for 10-20 min at the rotating speed of 700-1000 r/min;
the sand grinding in the step (1) is preferably carried out in a sand grinder until the fineness is less than or equal to 40 mu m;
the special anticorrosive wear-resistant coating for the heat exchanger comprises fluorocarbon resin, epoxy resin, an anticorrosive reinforcing agent, a wetting dispersant, a defoaming agent, a leveling agent, a pigment and a bacteriostatic agent, wherein the fluorocarbon resin and the epoxy resin are used for forming a protective film. The anticorrosion reinforcing agent is tetrafluoroindole, N atoms in the compound can coordinate with metal copper, iron and the like to form a compact protective layer, the hydrophobicity of F atoms can further enhance the anticorrosion effect, and indole rings have a certain absorption effect on ultraviolet rays and can reduce the damage of the ultraviolet rays to the coating. The bacteriostatic agent is nano silver and quaternary ammonium salt, so that the prepared paint film has stable antibacterial and bacteriostatic properties.
Compared with the prior art, the invention has the following advantages and effects:
(1) the fluorocarbon resin and the epoxy resin are taken as film forming substances, and the addition of the fluorocarbon resin and the epoxy resin can improve the hydrophobicity, the mechanical property and the corrosion resistance of a paint film besides the glossiness and the aging resistance of the paint film.
(2) According to the invention, tetrafluoroindole is taken as an anti-corrosion reinforcing agent, wherein N atoms in the compound can be coordinated with metal copper, iron and the like to form a compact protective layer, and the hydrophobicity of F atoms can further enhance the anti-corrosion effect, so that the addition of anti-corrosion pigment is greatly reduced.
(3) The special anticorrosive wear-resistant coating for the heat exchanger comprises bacteriostatic agents such as nano silver, quaternary ammonium salt and the like, so that the prepared paint film has stable and long-acting broad-spectrum bactericidal property and antifouling property.
(4) The raw materials used by the special anticorrosive wear-resistant coating for the heat exchanger provided by the invention are all water-based, and the main components do not contain volatile harmful substances, so that the special anticorrosive wear-resistant coating for the heat exchanger has the advantages of small smell, no toxicity, low VOC (volatile organic compound) emission, environmental friendliness and health.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The anticorrosive wear-resistant coating special for the heat exchanger comprises a component A and a component B (an isocyanate curing agent N75 and an amine curing agent M6870-W-53), wherein the component A comprises the following components in percentage by weight:
the preparation method of the special anticorrosive wear-resistant coating for the heat exchanger comprises the following steps:
(1) mixing the components of the anticorrosive wear-resistant coating special for the heat exchanger, namely fluorocarbon resin GK-570, epoxy resin E44, wetting dispersant (BYK-180 and AT-203), defoaming agent BYK-A530, flatting agent (BYK-306 and BYK-333) and water, and stirring AT the rotating speed of 500 revolutions per minute for 12min in a sealing manner; then adding pigments (mica iron oxide and titanium dioxide), an anti-corrosion reinforcing agent tetrafluoroindole and a bacteriostatic agent nano silver, and hermetically stirring at the rotating speed of 800 rpm for 18 min; grinding the mixture in a sand mill until the fineness is less than or equal to 40 mu m after uniform dispersion to obtain a component A for later use;
(2) uniformly mixing an isocyanate curing agent N75, an amine curing agent M6870-W-53 and a component A, wherein the mass ratio of the isocyanate curing agent N75 to the amine curing agent M6870-W-53 to the water-based resin (fluorocarbon resin and epoxy resin) in the component A is 0.10: 0.05: 1, obtaining the special anticorrosive wear-resistant coating for the heat exchanger.
Example 2
The anticorrosive wear-resistant coating special for the heat exchanger comprises a component A and a component B (an isocyanate curing agent N75 and an amine curing agent M6870-W-53), wherein the component A comprises the following components in percentage by weight:
the preparation method of the special anticorrosive wear-resistant coating for the heat exchanger comprises the following steps:
(1) the components of the anticorrosive wear-resistant coating special for the heat exchanger, namely fluorocarbon resin GK-570, epoxy resin E44, wetting dispersant (BYK-180 and EFKA-4010), defoaming agent BYK-A530, leveling agent BYK-306 and water are mixed at the rotating speed of 300 revolutions per minute and are stirred for 10min in a sealing manner; then adding pigments (mica iron oxide and titanium dioxide), an anti-corrosion reinforcing agent tetrafluoroindole and a bacteriostatic agent nano silver, and hermetically stirring at the rotating speed of 700 rpm for 15 min; grinding the mixture in a sand mill until the fineness is less than or equal to 40 mu m after uniform dispersion to obtain a component A for later use;
(2) uniformly mixing an isocyanate curing agent N75, an amine curing agent M6870-W-53 and a component A, wherein the mass ratio of the isocyanate curing agent N75 to the amine curing agent M6870-W-53 to the water-based resin (fluorocarbon resin and epoxy resin) in the component A is 0.05: 0.03: 1, obtaining the special anticorrosive wear-resistant coating for the heat exchanger.
Example 3
The anticorrosive wear-resistant coating special for the heat exchanger comprises a component A and a component B (an isocyanate curing agent N75 and an amine curing agent M6870-W-53), wherein the component A comprises the following components in percentage by weight:
the preparation method of the special anticorrosive wear-resistant coating for the heat exchanger comprises the following steps:
(1) the components of the anticorrosive wear-resistant coating special for the heat exchanger, namely fluorocarbon resin GK-570, epoxy resin E44, wetting dispersant (BYK-180 and AT-203), defoaming agent (BYK-A530 and BYK-024), flatting agent (BYK-306 and BYK-333) and water are mixed, and the mixture is stirred AT the rotating speed of 600 revolutions per minute for 10min in a sealing way; then adding pigments (mica iron oxide, titanium dioxide and aluminum tripolyphosphate), an anti-corrosion reinforcing agent tetrafluoroindole and a bacteriostatic agent nano silver, and hermetically stirring at the rotating speed of 1000 rpm for 10 min; grinding the mixture in a sand mill until the fineness is less than or equal to 40 mu m after uniform dispersion to obtain a component A for later use;
(2) uniformly mixing an isocyanate curing agent N75, an amine curing agent M6870-W-53 and a component A, wherein the mass ratio of the isocyanate curing agent N75 to the amine curing agent M6870-W-53 to the water-based resin (fluorocarbon resin and epoxy resin) in the component A is 0.10: 0.05: 1, obtaining the special anticorrosive wear-resistant coating for the heat exchanger.
Comparative examples
The coating comprises a component A and a component B (an isocyanate curing agent N75 and an amine curing agent M6870-W-53), wherein the component A comprises the following components in percentage by weight:
the preparation method of the coating comprises the following steps:
(1) mixing fluorocarbon resin GK-570, epoxy resin E44, wetting dispersant (BYK-180 and AT-203), defoaming agent (BYK-A530 and BYK-024), flatting agent (BYK-306 and BYK-333) and water which are components of the coating, and hermetically stirring AT the rotating speed of 600 revolutions per minute for 10 min; then adding pigments (mica iron oxide, titanium dioxide and aluminum tripolyphosphate) and bacteriostatic agent nano silver, sealing and stirring at the rotating speed of 1000 rpm for 10 min; grinding the mixture in a sand mill until the fineness is less than or equal to 40 mu m after uniform dispersion to obtain a component A for later use;
(2) uniformly mixing an isocyanate curing agent N75, an amine curing agent M6870-W-53 and a component A, wherein the mass ratio of the isocyanate curing agent N75 to the amine curing agent M6870-W-53 to the water-based resin (fluorocarbon resin and epoxy resin) in the component A is 0.10: 0.05: 1, obtaining the coating.
Effects of the embodiment
The paint prepared in the examples 1-3 and the comparative example (compared with the example 3, the difference is that no tetrafluoroindole is added) is sprayed, and the basic performance is detected, and the prepared paint film has the following performance indexes:
TABLE 1 basic Properties of the coatings prepared in examples 1 to 3
(2) Water and salt water resistance testing
The coatings prepared in examples 1 to 3 were subjected to a clean water immersion test and a 5% NaCl solution immersion test; the results are shown in Table 2.
TABLE 1 Water resistance of the coatings prepared in examples 1 to 3
(3) Boiling Water test
The test is conducted according to ASTM D6665B test conditions, which are designed to measure the cracking properties of coatings and the loss of adhesion after multiple contact with boiling water. Each panel was exposed to boiling water for 1min, then cooled completely, and then immersed in boiling water again.
TABLE 3 boiling water resistance of the coatings prepared in examples 1 to 3
Note: NCD/100% means no cracking detected, 100% adhesion.
(4) Salt spray test
Salt spray test results show that the coating prepared in the embodiment 1-3 does not foam and fall off after 5000 hours, and has super-strong corrosion resistance.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The special anticorrosive wear-resistant coating for the heat exchanger is characterized by comprising a component A and a component B, wherein the component A comprises the following components in percentage by weight:
the component B is a curing agent;
the dosage of the component B is 0.08-0.15 time of the total mass of the fluorocarbon resin and the epoxy resin;
the corrosion-resistant reinforcing agent is tetrafluoroindole, and the structural formula of the corrosion-resistant reinforcing agent is shown as follows:
2. the special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the fluorocarbon resin is fluorocarbon resin GK-570.
3. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the epoxy resin is bisphenol A type epoxy resin.
4. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the bisphenol A epoxy resin is at least one of E42, E44 and E51.
5. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the wetting dispersant is AT least one of BYK-180, AT-203 and EFKA-4010.
6. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the defoaming agent is at least one of BYK-A530, BYK-024 and BYK-054.
7. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the leveling agent is at least one of BYK-306, BYK-333 and TEGO-432;
8. the special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the curing agent is at least one of isocyanate curing agent and amine curing agent.
9. The special anticorrosive wear-resistant coating for the heat exchanger according to claim 1, characterized in that:
the pigment is at least one of aluminum tripolyphosphate, zinc phosphate, zinc borate, titanium dioxide, precipitated barium sulfate, talcum powder, mica iron oxide and aluminum oxide;
the bacteriostatic agent is at least one of nano silver and quaternary ammonium salt.
10. The preparation method of the special anticorrosive wear-resistant coating for the heat exchanger as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
(1) the components of the special anticorrosive wear-resistant coating for the heat exchanger, namely fluorocarbon resin, epoxy resin, wetting dispersant, defoamer, flatting agent and water are mixed and uniformly dispersed under the condition of low-speed stirring; then adding pigment, anti-corrosion reinforcing agent and bacteriostatic agent, uniformly dispersing under the condition of high-speed stirring, and sanding to obtain a component A for later use;
(2) and mixing the component A and the component B according to the proportion to obtain the special anticorrosive wear-resistant coating for the heat exchanger.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113025130A (en) * | 2021-03-16 | 2021-06-25 | 浙江中财管道科技股份有限公司 | Anticorrosion, antisludging and antibacterial coating for mold core water well and application thereof |
| CN114316694A (en) * | 2022-01-20 | 2022-04-12 | 常州朗兴涂装科技有限公司 | High-corrosion-resistance environment-friendly coating and preparation method thereof |
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