CN113667371A - Water-based epoxy anticorrosive paint for heat exchanger and preparation method thereof - Google Patents
Water-based epoxy anticorrosive paint for heat exchanger and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of coatings, and particularly relates to a water-based epoxy anticorrosive coating for a heat exchanger and a preparation method thereof. The invention relates to a water-based epoxy anticorrosive paint for a heat exchanger, which mainly comprises the following raw materials in parts by weight: 200-280 parts of water-based epoxy emulsion, 4-24 parts of water-based organic silicon emulsion, 16-40 parts of amino resin, 1.2-4 parts of catalyst, 130-220 parts of water-based pigment and filler slurry, 1.2-2.8 parts of defoaming agent, 0.4-2 parts of flatting agent, 1.2-2.8 parts of anti-flash rust agent and 0-12 parts of deionized water. The water-based epoxy anticorrosive paint for the heat exchanger, which is prepared by the invention, can obviously improve the tolerance of the water-based epoxy anticorrosive paint to various chemical media, such as heat-resistant acid, heat-resistant alkali and the like, in the using process, and simultaneously meets the requirement of steam blowing resistance (1.0MPa, 240 ℃ and 72 hours) of a petrochemical device under extreme application conditions.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a water-based epoxy anticorrosive coating for a heat exchanger and a preparation method thereof.
Background
A large amount of various heat exchangers are used in the petrochemical production engineering processes such as modern petroleum refining, chemical fertilizer and the like, however, the quality deterioration of global crude oil heaviness, deterioration and high vulcanization results in aggravation of the corrosion problem of the heat exchanger on the one hand and even material leakage, and a large amount of scales can be generated in the heat exchanger on the other hand, so that the heat exchange efficiency is influenced, and the normal production of enterprises is seriously influenced.
The organic coating is arranged on the surface of the heat exchanger, which is the most effective and most convenient corrosion protection measure of the heat exchanger, the current special anticorrosive coating for the heat exchanger mostly adopts solvent type epoxy resin or a modified resin system thereof, and the coupling of multiple functions such as corrosion resistance, high temperature resistance, high thermal conductivity and the like is realized through coating multiple coatings with different functionalities according to the requirements of construction and actual use. However, with the continuous emergence of relevant environmental protection regulations in China, the requirements on the emission of VOCs (volatile organic compounds) of coating and painting are becoming more and more stringent, the solvent-type heat exchanger anticorrosive coating synthesized by the prior art is difficult to meet the environmental protection requirements of national mandatory standard GB 30981, and the anticorrosive, antiscale and antisludging capabilities are poor. Therefore, the preparation of the water-based heat exchanger anticorrosive coating which is environment-friendly, safe in production and clean in construction is urgently needed, and the water-based heat exchanger anticorrosive coating has excellent temperature resistance, medium resistance, water resistance, alkali resistance, scale prevention and scale inhibition.
Disclosure of Invention
The invention aims to provide the water-based epoxy anticorrosive paint for the heat exchanger, which is environment-friendly, safe in production and clean in construction, and is used for the heat exchanger.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a water-based epoxy anticorrosive paint for a heat exchanger mainly comprises the following raw materials in parts by weight: 200-280 parts of water-based epoxy emulsion, 4-24 parts of water-based organic silicon emulsion, 16-40 parts of amino resin, 1.2-4 parts of catalyst, 130-220 parts of water-based pigment and filler slurry, 1.2-2.8 parts of defoaming agent, 0.4-2 parts of flatting agent, 1.2-2.8 parts of anti-flash rust agent and 0-12 parts of deionized water.
The water-based epoxy emulsion is CTW-6062, and the solid content is 54-56% (mass percentage).
The aqueous organosilicon emulsion is one or two of MP50E or MPF 52E.
The amino resin is any one or more of CYMEL 303, CYMEL 325, CYMEL 327 or CYMEL 350.
The catalyst is any one or more of CYCAT 4040, BYK-450, N-1419 or N-3525.
The water-based pigment and filler slurry mainly comprises the following raw materials in parts by weight: 28-57 parts of deionized water, 5-15 parts of a dispersing agent, 0.25-0.75 part of a wetting agent, 4-14 parts of graphene slurry, 60-120 parts of a pigment and 25-35 parts of a filler.
The water-based pigment and filler slurry is prepared by the preparation method comprising the following steps: sequentially adding deionized water, a dispersing agent, a wetting agent, graphene slurry, a pigment and a filler, uniformly stirring, grinding and dispersing, standing for defoaming, and then filtering and discharging to obtain the graphene nano-composite material.
The pigment is any one or more of titanium dioxide, graphite powder, aluminum tripolyphosphate, zinc phosphate and alumina, and the filler is any one or more of mica powder, silica micropowder, talcum powder and barium sulfate.
The defoaming agent is any one or more of 901W, BYK-022 or BYK-019, the leveling agent is any one or two of RM-2020 or BYK-346, and the flash rust inhibitor is any one or more of Roybo 60, sodium nitrite or Clariant-AC 18.
The preparation method of the water-based epoxy anticorrosive paint for the heat exchanger comprises the following steps:
sequentially adding the aqueous epoxy emulsion, the aqueous organic silicon emulsion, the amino resin and the catalyst, uniformly stirring at a high speed, adding the aqueous pigment slurry in the stirring process, continuously adding the defoaming agent, the flatting agent and the flash rust preventive in the stirring state, uniformly dispersing, and finally adding the deionized water to obtain the aqueous epoxy resin aqueous paint.
The water-based epoxy anticorrosive paint for the heat exchanger has the beneficial effects that:
the water-based epoxy anticorrosive paint for the heat exchanger provided by the invention selects water-based epoxy emulsion, amino resin and water-based organic silicon resin as main film forming substances, a small amount of acid catalyst is added, and partial graphene is introduced into slurry for modification. Through molecular structure design, the crosslinking of amino resin and hydroxyl-containing epoxy emulsion is accelerated by utilizing an acid catalyst to form a three-dimensional net-shaped crosslinking structure; the introduction of the cross-linked semi-inorganic high polymer water-based organic silicon with silicon-oxygen-silicon as a main chain and the graphene with high compatibility and high structural strength ensures that the coating has excellent damp-heat resistance performance, and improves the corrosion resistance and mechanical property of the coating. The substances are matched and used according to a specific proportion, and the prepared coating is baked and cured at a high temperature to form a graphene modified rigid epoxy-amino-organic silicon resin interpenetrating network structure with high shielding property and high crosslinking density, and the graphene modified rigid epoxy-amino-organic silicon resin interpenetrating network structure has excellent water resistance, acid and alkali resistance and excellent heat resistance. The water-based epoxy anticorrosive paint for the heat exchanger can completely meet the requirements of steam sweeping resistance (1.0MPa, 240 ℃ and 72h) of the heat exchanger paint. In addition, the coating can form high-efficiency protection on the heat exchanger and prevent various media such as hot acid, hot alkali and the like from damaging the heat exchanger in the actual use process.
According to the water-based epoxy anticorrosive paint for the heat exchanger, the dispersant, the wetting agent, the graphene slurry, the pigment, the filler and the deionized water are stirred and mixed to prepare the water-based pigment and filler slurry, and the obtained slurry is excellent in tinting strength and storage stability, good in environmental protection property, low in VOC content and excellent in compatibility with a water-based resin system.
The water-based epoxy anticorrosive paint for the heat exchanger, disclosed by the invention, introduces hexagonal layered structure nonmetal graphite and derivative graphene thereof with good heat conductivity, high temperature resistance and corrosion resistance, aluminum tripolyphosphate and zinc phosphate with a chemical corrosion inhibition effect, mica powder, silicon micropowder, alumina and other pigments and fillers with a physical shielding effect, and when the paint is cured, the materials interact with a film-forming substance, so that the paint has physical adhesion and chemical bridging, and the pigments, the fillers and the film-forming substance form a compact integrated structure, so that the anticorrosive performance of a coating is further improved.
Compared with the traditional anticorrosive paint for the heat exchanger, the waterborne epoxy anticorrosive paint for the heat exchanger is a waterborne anticorrosive paint for the heat exchanger, which is one-component, thermocuring and bottom surface integrating. On one hand, the coating is a water-based coating with the integrated bottom surface, so that the production period is shortened, the coating production cost is reduced and the quality problem of a matched coating is avoided in the actual construction process. On the other hand, in the process of diluting the coating, a small amount of deionized water is added, and no high VOC solvent is required to be added, so that the coating belongs to a low VOC environment-friendly product and completely meets the environment-friendly requirement of the national mandatory standard GB 30981.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a comparative graph of the appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention before and after a steam purge resistance (1.0MPa, 240 ℃ and 72h) test, (FIG. 1a is an appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention before a steam purge resistance (1.0MPa, 240 ℃ and 72h) test, and FIG. 1b is an appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention after a steam purge resistance (1.0MPa, 240 ℃ and 72h) test);
FIG. 2 is an appearance diagram of a steel plate coated with the waterborne epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention after resisting salt spray for 1500 h;
Detailed Description
The raw materials referred to in the examples and comparative examples include:
the raw materials used in the examples and comparative examples were commercially available commercial products and were commercially available from commercial sources, unless otherwise specified.
EFKA-4595, technical grade, Effcard corporation; BYK-331, BYK-190, BYK-019, BYK-022, BYK-346, BYK-450, technical grade, Bike corporation; r-902, R-960, technical grade, DuPont; graphene paste GRF-GAC-01, GRF-FLGAD-a01, industrial grade, garrufeng, su; aqueous epoxy emulsion CTW-6062, industrial, midsea oil, changzhou coatings chemical research institute; aqueous silicone emulsion MPF 52E, MP50E, technical grade, wacker chemical company; amino resins CYMEL 303, CYMEL 327, CYMEL 350, CYMEL 325, catalyst CYCAT 4040, technical grade, tradesman corporation; RM-2020, Industrial grade, Guangzhi chemical Co; roybo 60, industrial grade, rayleigh corporation, usa; graphene slurry TY08W3000, technical grade, Tianyuan xi wang company; 901W, industrial grade, winning company; Clariant-AC18, technical grade, Craine corporation.
Example 1
The water-based epoxy anticorrosive paint for the heat exchanger mainly comprises the following raw materials in parts by mass: 240 parts of waterborne epoxy emulsion CTW-6062, 12 parts of waterborne silicone emulsion MPF 52E, 24 parts of amino resin CYMEL 303, 2.4 parts of catalyst CYCAT 4040, 195.1 parts of waterborne pigment and filler slurry, 1.8 parts of defoaming agent BYK-019, 0.8 part of leveling agent RM-2020, 1.2 parts of anti-flash rust agent Roybo 60 and 2.4 parts of deionized water.
The water-based pigment and filler slurry mainly comprises the following raw materials in parts by weight: 45.1 parts of deionized water, 10.6 parts of a dispersant EFKA-4595, 0.5 part of a wetting agent BYK-331, 9 parts of graphene slurry GRF-GAC-01, 58 parts of titanium dioxide R-902, 14.5 parts of 800-mesh graphite powder, 4.6 parts of 1000-mesh aluminum tripolyphosphate, 4.6 parts of 1000-mesh zinc phosphate, 10 parts of 2000-mesh mica powder, 10 parts of 1250-mesh silicon powder, 10 parts of 1250-mesh aluminum oxide, 4.6 parts of 3000-mesh talcum powder and 4.6 parts of 800-mesh barium sulfate.
The aqueous pigment filler slurry of the embodiment is prepared by the following preparation method: adding deionized water, a dispersing agent EFKA-4595, a wetting agent BYK-331, titanium dioxide R-902, graphite powder, graphene slurry GRF-GAC-01, aluminum tripolyphosphate, zinc phosphate, mica powder, silica powder, alumina, talcum powder and barium sulfate into a proportioning cylinder in sequence, uniformly stirring, grinding and dispersing until the fineness of a scraper is below 20 mu m, standing for defoaming, and then filtering and discharging to obtain the nano-silver-based aluminum oxide material.
The preparation method of the water-based epoxy anticorrosive paint for the heat exchanger comprises the following steps:
sequentially adding the water-based epoxy emulsion, the water-based organic silicon emulsion, the amino resin and the catalyst into a proportioning cylinder, uniformly stirring at a high speed of 2000r/min, adding the water-based pigment slurry into the proportioning cylinder in the stirring process, continuously adding the defoaming agent, the leveling agent and the flash rust inhibitor in the stirring state, uniformly dispersing, finally adding the deionized water, and uniformly stirring to obtain the aqueous pigment paste.
Example 2
The water-based epoxy anticorrosive paint for the heat exchanger mainly comprises the following raw materials in parts by mass: 240 parts of aqueous epoxy emulsion CTW-6062, 20 parts of aqueous organosilicon emulsion MP50E, 24 parts of amino resin CYMEL 327, 2.4 parts of catalyst CYCAT 4040, 182 parts of aqueous pigment and filler slurry, 1.8 parts of defoaming agent BYK-022, 0.8 part of flatting agent BYK-346, 1.2 parts of anti-flash rust agent Roybo 60 and 2.4 parts of deionized water.
The water-based pigment and filler slurry mainly comprises the following raw materials in parts by weight: 45.1 parts of deionized water, 12.6 parts of dispersant BYK-190, 0.5 part of wetting agent BYK-331, 5 parts of graphene slurry TY08W3000, 51 parts of titanium dioxide R-902, 22 parts of 800-mesh graphite powder, 4.6 parts of 1000-mesh aluminum tripolyphosphate, 2 parts of 1000-mesh zinc phosphate, 10 parts of 2000-mesh mica powder, 10 parts of 1250-mesh silicon micropowder, 10 parts of 1250-mesh aluminum oxide, 4.6 parts of 3000-mesh talcum powder and 4.6 parts of 800-mesh barium sulfate.
The aqueous pigment filler slurry of the embodiment is prepared by the following preparation method: adding deionized water, a dispersing agent BYK-190, a wetting agent BYK-331, titanium dioxide R-902, graphite powder, graphene slurry TY08W3000, aluminum tripolyphosphate, zinc phosphate, mica powder, silica powder, alumina, talcum powder and barium sulfate into a proportioning cylinder in sequence, uniformly stirring, grinding and dispersing until the fineness of a scraper plate is below 20 mu m, standing for defoaming, and then filtering and discharging to obtain the nano-silver-based carbon nano-material.
The preparation method of the water-based epoxy anticorrosive paint for the heat exchanger comprises the following steps:
sequentially adding aqueous epoxy emulsion CTW-6062, aqueous organosilicon emulsion MP50E, amino resin CYMEL 327 and catalyst CYCAT 4040 into a mixing cylinder, uniformly stirring at a high speed of 1500r/min, adding aqueous pigment slurry into the mixing cylinder in the stirring process, continuously adding a defoaming agent BYK-022, a flatting agent BYK-346 and an anti-flash rust agent Roybo 60 under the stirring state, uniformly dispersing, finally adding deionized water, and uniformly stirring to obtain the anti-flash rust paint.
Example 3
The water-based epoxy anticorrosive paint for the heat exchanger mainly comprises the following raw materials in parts by mass: 240 parts of waterborne epoxy emulsion CTW-6062, 12 parts of waterborne silicone emulsion MPF 52E, 34 parts of amino resin CYMEL 350, 3.6 parts of catalyst BYK-450, 195.1 parts of waterborne pigment and filler slurry, 1.8 parts of defoaming agent 901W, 0.8 part of leveling agent RM-2020, 1.2 parts of anti-flash rust agent Roybo 60 and 3 parts of deionized water.
The water-based pigment and filler slurry mainly comprises the following raw materials in parts by weight: 45.1 parts of deionized water, 10.6 parts of a dispersant EFKA-4595, 0.5 part of a wetting agent BYK-331, 60 parts of titanium dioxide R-960, 14.5 parts of 800-mesh graphite powder, 4 parts of graphene slurry TY08W3000, 4.6 parts of 1000-mesh aluminum tripolyphosphate, 4.6 parts of 1000-mesh zinc phosphate, 10 parts of 2000-mesh mica powder, 10 parts of 1250-mesh silica powder, 4 parts of 1250-mesh alumina, 4.6 parts of 3000-mesh talcum powder and 8.6 parts of 800-mesh barium sulfate.
The aqueous pigment filler slurry of the embodiment is prepared by the following preparation method: adding deionized water, a dispersing agent, a wetting agent, titanium dioxide, graphite powder, graphene slurry, aluminum tripolyphosphate, zinc phosphate, mica powder, silica micropowder, alumina, talcum powder and barium sulfate into a proportioning cylinder in sequence, uniformly stirring, grinding and dispersing to the fineness of a scraper blade of less than 20 mu m, standing for defoaming, filtering and discharging to obtain the paint.
The preparation method of the water-based epoxy anticorrosive paint for the heat exchanger comprises the following steps:
sequentially adding the water-based epoxy emulsion, the water-based organic silicon emulsion, the amino resin and the catalyst into a proportioning cylinder, uniformly stirring at a high speed of 2500r/min, adding the water-based pigment slurry into the proportioning cylinder in the stirring process, continuously adding the defoaming agent, the leveling agent and the flash rust inhibitor in the stirring state, uniformly dispersing, finally adding the deionized water, and uniformly stirring to obtain the aqueous pigment paste.
Example 4
The water-based epoxy anticorrosive paint for the heat exchanger mainly comprises the following raw materials in parts by mass: 200 parts of aqueous epoxy emulsion CTW-6062, 12 parts of aqueous organosilicon emulsion MP50E, 24 parts of amino resin CYMEL 325, 2.4 parts of catalyst CYCAT 4040, 189.2 parts of aqueous pigment and filler slurry, 1.8 parts of defoaming agent BYK-019, 0.8 part of flatting agent BYK-346, 1.2 parts of anti-flash rust agent Clariant-AC18 and 2.4 parts of deionized water.
The water-based pigment and filler slurry mainly comprises the following raw materials in parts by weight: 45.1 parts of deionized water, 10.6 parts of a dispersant EFKA-4595, 0.6 part of a wetting agent BYK-331, 58 parts of titanium dioxide R-902, 14.5 parts of 800-mesh graphite powder, 12 parts of graphene slurry GRF-FLGAD-A01, 2.6 parts of 1000-mesh aluminum tripolyphosphate, 4.6 parts of 1000-mesh zinc phosphate, 14 parts of 2000-mesh mica powder, 8 parts of 1250-mesh silica powder, 10 parts of 1250-mesh aluminum oxide, 4.6 parts of 3000-mesh talcum powder and 4.6 parts of 800-mesh barium sulfate.
The aqueous pigment filler slurry of the embodiment is prepared by the following preparation method: adding deionized water, a dispersing agent, a wetting agent, titanium dioxide, graphite powder, graphene slurry, aluminum tripolyphosphate, zinc phosphate, mica powder, silica micropowder, alumina, talcum powder and barium sulfate into a proportioning cylinder in sequence, uniformly stirring, grinding and dispersing to the fineness of a scraper blade of less than 20 mu m, standing for defoaming, filtering and discharging to obtain the paint.
The preparation method of the water-based epoxy anticorrosive paint for the heat exchanger comprises the following steps:
sequentially adding the water-based epoxy emulsion, the water-based organic silicon emulsion, the amino resin and the catalyst into a proportioning cylinder, uniformly stirring at a high speed of 1000r/min, adding the water-based pigment slurry into the proportioning cylinder in the stirring process, continuously adding the defoaming agent, the leveling agent and the flash rust inhibitor in the stirring state, uniformly dispersing, finally adding the deionized water, and uniformly stirring to obtain the aqueous pigment paste.
Comparative example 1
A commercial solvent-borne heat exchanger coating SHY99 was used as a comparative example.
Examples of the experiments
1) Preparation of test substrates
Steel plates and heat exchanger steel tubes were used as test substrates. The method comprises the steps of firstly carrying out rust removal and sand blasting treatment on the surfaces of a steel plate and a steel pipe, wherein the treatment grade of the surface of a base material reaches St2 grade or above, then respectively coating the surfaces of the steel plate and the steel pipe with the water-based epoxy anticorrosive paint for the heat exchanger prepared in the embodiment 1, the embodiment 2, the embodiment 3, the embodiment 4 and the comparative example 1 according to the SH/T3540 and 2007 specification of construction and acceptance of composite coatings of tube bundles of heat exchange equipment for steel structures, and the thickness of a dry film of a test plate is 150 +/-30 mu m. Wherein, the heat exchanger tube is preferably coated; the outside of the heat exchanger tube is preferably coated or sprayed; the surfaces of the tube plate, the tube box and the shell are preferably brushed and sprayed.
The initial curing temperature of the coated film after coating is 180 +/-5 ℃, the temperature is slowly increased during curing, the temperature increase rate is 2-3 ℃/min, the curing temperature of the final coating is 200 +/-5 ℃, and the temperature is kept constant for 3 hours; after the coating is cured, the surface of the coating is bright and smooth, and the coating has no defects of wrinkles, sagging, dropping, invisible pores, bubbling and the like, and the color is the natural color of the coating; the coating is completely solidified, and the cotton ball dipped with the special solvent is used for repeatedly wiping the local part of the coated surface, so that the cotton ball is qualified as not discoloring.
2) Paint Performance testing
The coating performance mainly inspects appearance, flexibility, hardness, adhesive force, impact resistance, alternation resistance experiment, steam blowing resistance, chemical medium resistance, salt spray resistance and VOC content of the water-based epoxy anticorrosive coating for the heat exchanger. The test results are shown in Table 1.
Flexibility: tested according to GB/T1731-1993.
Hardness: testing according to GB/T6739-2006.
Adhesion force: according to the test of GB/T9286-1998, the results are classified into 1-3 grades for comparison, the best grade 1 is, and the worst grade 3 is; impact resistance: tested according to GB/T1732-1993.
Alternation resistance experiment: according to the practical application requirements, the test substrate is subjected to 10-cycle alternating-current-resistant experiment with the use temperature from an ice-water mixture to 250 ℃ (quenching); steam-resistant purging: according to the practical application requirement, steam blowing resistant test is carried out on the test substrate under the pressure of 1.0MPa by using high-temperature steam at 240 ℃.
Chemical resistance media: tested according to GB/T9274-1988.
Salt spray resistance: tested according to GB/T1771-2007.
VOC content: the test was carried out according to GB/T18581-2001.
TABLE 1 paint Performance test results
As can be seen from Table 1, compared with the coating film formed by the coating of comparative example 1, the high temperature resistance and the mechanical property of the waterborne epoxy anticorrosive coatings for heat exchangers prepared in examples 1 to 4 of the invention are equivalent to those of solvent-based heat exchangers, but the chemical resistance, the water resistance and the anticorrosive property of the waterborne epoxy anticorrosive coatings for heat exchangers prepared in examples 1 to 4 of the invention are superior to those of solvent-based heat exchanger coatings.
As shown in FIG. 1, FIG. 1 is a comparison of the appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention before and after a steam purge (1.0MPa, 240 ℃ and 72h) test, in which FIG. 1a is an appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention before a steam purge (1.0MPa, 240 ℃ and 72h) test, and FIG. 1b is an appearance of a steel pipe coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention after a steam purge (1.0MPa, 240 ℃ and 72h) test. Experimental results show that a coating formed by coating the water-based epoxy anticorrosive paint for the heat exchanger prepared in the embodiment 1 of the invention is flat and strong after steam purging, so that the water-based epoxy anticorrosive paint for the heat exchanger can be completely applied to the heat exchanger under different pressures and temperatures, and can ensure the normal operation of the heat exchanger.
As shown in FIG. 2, FIG. 2 is an external view of a steel sheet coated with the water-based epoxy anticorrosive paint for heat exchangers prepared in example 1 of the present invention after 1500 hours of salt spray resistance. Experiments show that after the salt spray resistance is 1500 hours, the coating on the steel plate has no diffusion corrosion, no bubbles on the plate surface and excellent corrosion resistance.
The water-based epoxy anticorrosive paint for the heat exchanger provided by the invention selects water-based epoxy emulsion, amino resin and water-based organic silicon resin as main film forming substances, a small amount of acid catalyst is added, and partial graphene is introduced into slurry for modification. Through molecular structure design, the crosslinking of amino resin and hydroxyl-containing epoxy emulsion is accelerated by utilizing an acid catalyst to form a three-dimensional net-shaped crosslinking structure; the introduction of the cross-linked semi-inorganic high polymer water-based organic silicon with silicon-oxygen-silicon as a main chain and the graphene with high compatibility and high structural strength ensures that the coating has excellent damp-heat resistance performance, and improves the corrosion resistance and mechanical property of the coating. Meanwhile, the substances are matched and used according to a specific proportion, and the prepared coating is baked and cured at high temperature to form a graphene modified rigid epoxy-amino-organic silicon resin interpenetrating network structure with high shielding property and high crosslinking density, so that the graphene modified rigid epoxy-amino-organic silicon resin interpenetrating network structure has excellent water resistance, acid and alkali resistance and excellent heat resistance. The water-based epoxy anticorrosive paint for the heat exchanger can completely meet the requirements of steam sweeping resistance (1.0MPa, 240 ℃ and 72h) of the heat exchanger paint. Therefore, the coating can form high-efficiency protection on the heat exchanger and prevent various media such as hot acid, hot alkali and the like from damaging the heat exchanger in the actual use process.
According to the water-based epoxy anticorrosive paint for the heat exchanger, the dispersant, the wetting agent, the graphene slurry, the pigment, the filler and the deionized water are stirred and mixed to prepare the water-based pigment and filler slurry, and the obtained slurry is excellent in tinting strength and storage stability, good in environmental protection property, low in VOC content and excellent in compatibility with a water-based resin system.
The water-based epoxy anticorrosive paint for the heat exchanger, disclosed by the invention, introduces hexagonal layered structure nonmetal graphite and derivative graphene thereof with good heat conductivity, high temperature resistance and corrosion resistance, aluminum tripolyphosphate and zinc phosphate with a chemical corrosion inhibition effect, mica powder, silicon micropowder, alumina and other pigments and fillers with a physical shielding effect, and when the paint is cured, the materials interact with a film-forming substance, so that the paint has physical adhesion and chemical bridging, and the pigments, the fillers and the film-forming substance form a compact integrated structure, so that the anticorrosive performance of a coating is further improved.
Compared with the traditional heat exchanger anticorrosive paint, the water-based epoxy anticorrosive paint for the heat exchanger is a water-based anticorrosive paint with single component, thermocuring and bottom surface integration. On one hand, the coating is a water-based coating with the integrated bottom surface, so that the production period is shortened, the coating production cost is reduced and the quality problem of a matched coating is avoided in the actual construction process; on the other hand, the coating does not need to be added with any high VOC solvent except a small amount of deionized water in the dilution process, belongs to a low VOC environment-friendly product, and completely meets the environmental protection requirement of the national mandatory standard GB 30981.
The water-based epoxy anticorrosive paint for the heat exchanger can be applied to heat exchanger protection within the range of 150-.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. The water-based epoxy anticorrosive paint for the heat exchanger is characterized by mainly comprising the following raw materials in parts by mass: 200-280 parts of water-based epoxy emulsion, 4-24 parts of water-based organic silicon emulsion, 16-40 parts of amino resin, 1.2-4 parts of catalyst, 130-220 parts of water-based pigment and filler slurry, 1.2-2.8 parts of defoaming agent, 0.4-2 parts of flatting agent, 1.2-2.8 parts of anti-flash rust agent and 0-12 parts of deionized water.
2. The waterborne epoxy anticorrosive coating for heat exchangers of claim 1, wherein the waterborne epoxy emulsion is CTW-6062.
3. The water-based epoxy anticorrosive paint for heat exchangers as claimed in claim 1, wherein the water-based silicone emulsion is either one or both of MP50E and MPF 52E.
4. The waterborne epoxy anticorrosive coating for heat exchangers of claim 1, wherein the amino resin is any one or more of CYMEL 303, CYMEL 325, CYMEL 327 or CYMEL 350.
5. The water-based epoxy anticorrosive paint for heat exchangers as claimed in claim 1, wherein the catalyst is any one or more of CYCAT 4040, BYK-450, N-1419 or N-3525.
6. The water-based epoxy anticorrosive paint for heat exchangers as claimed in claim 1, wherein the water-based pigment and filler slurry mainly comprises the following raw materials in parts by mass: 28-57 parts of deionized water, 5-15 parts of a dispersing agent, 0.25-0.75 part of a wetting agent, 4-14 parts of graphene slurry, 60-120 parts of a pigment and 25-35 parts of a filler.
7. The waterborne epoxy anticorrosive paint for heat exchangers as claimed in claim 6, wherein the waterborne pigment slurry is prepared by the following steps: sequentially adding deionized water, a dispersing agent, a wetting agent, graphene slurry, a pigment and a filler, uniformly stirring, grinding and dispersing, standing for defoaming, and then filtering and discharging to obtain the graphene nano-composite material.
8. The water-based epoxy anticorrosive paint for heat exchangers as claimed in claim 6, wherein the pigment is any one or more of titanium dioxide, graphite powder, aluminum tripolyphosphate, zinc phosphate and aluminum oxide, and the filler is any one or more of mica powder, silica micropowder, talcum powder and barium sulfate.
9. The water-based epoxy anticorrosive paint for heat exchangers as claimed in claim 1, wherein the defoaming agent is any one or more of 901W, BYK-022 or BYK-019, the leveling agent is any one or two of RM-2020 or BYK-346, and the flash rust preventive agent is any one or more of Roybo 60, sodium nitrite or Clariant-AC 18.
10. A method for preparing the water-based epoxy anticorrosive paint for heat exchangers according to any one of claims 1 to 9, which comprises the following steps: sequentially adding the aqueous epoxy emulsion, the aqueous organic silicon emulsion, the amino resin and the catalyst, uniformly stirring at a high speed, adding the aqueous pigment slurry in the stirring process, continuously adding the defoaming agent, the flatting agent and the flash rust preventive in the stirring state, uniformly dispersing, and finally adding the deionized water to obtain the aqueous epoxy resin aqueous paint.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114525078A (en) * | 2021-12-24 | 2022-05-24 | 南京长江涂料有限公司 | Water-based modified organic silicon high-temperature-resistant anticorrosive paint and preparation method thereof |
| CN116144246A (en) * | 2023-01-13 | 2023-05-23 | 浙江尚品飞轿制漆有限公司 | Ultra-low VOC (volatile organic compound) high-adhesion electrostatic coating water-based anti-corrosion primer and preparation method thereof |
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|---|---|---|---|---|
| CN109627879A (en) * | 2018-12-07 | 2019-04-16 | 中山大学 | A kind of function nano heat radiation coating and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109627879A (en) * | 2018-12-07 | 2019-04-16 | 中山大学 | A kind of function nano heat radiation coating and its preparation method and application |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114525078A (en) * | 2021-12-24 | 2022-05-24 | 南京长江涂料有限公司 | Water-based modified organic silicon high-temperature-resistant anticorrosive paint and preparation method thereof |
| CN114525078B (en) * | 2021-12-24 | 2023-03-31 | 南京长江涂料有限公司 | Water-based modified organic silicon high-temperature-resistant anticorrosive paint and preparation method thereof |
| CN116144246A (en) * | 2023-01-13 | 2023-05-23 | 浙江尚品飞轿制漆有限公司 | Ultra-low VOC (volatile organic compound) high-adhesion electrostatic coating water-based anti-corrosion primer and preparation method thereof |
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