CN115160897A - Temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating and preparation method and spraying method thereof - Google Patents
Temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating and preparation method and spraying method thereof Download PDFInfo
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- CN115160897A CN115160897A CN202210977527.4A CN202210977527A CN115160897A CN 115160897 A CN115160897 A CN 115160897A CN 202210977527 A CN202210977527 A CN 202210977527A CN 115160897 A CN115160897 A CN 115160897A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/08—Flame spraying
- B05D1/10—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/031—Powdery paints characterised by particle size or shape
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, a preparation method and a spraying method thereof, and belongs to the technical field of powder coatings. The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight: 15-25 parts of modified epoxy resin, 5-15 parts of epoxy resin A, 5-15 parts of epoxy resin B, 10-20 parts of o-cresol formaldehyde resin, 10-20 parts of phenol formaldehyde resin, 2-6 parts of barium sulfate, 2-6 parts of white corundum, 2-6 parts of silica aerogel, 2-6 parts of mica, 1-5 parts of graphite, 1-5 parts of titanium dioxide, 1-2 parts of dimethylimidazole, 2-6 parts of a brightener, 1-5 parts of a flatting agent and 1-5 parts of benzoin. The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has extremely strong high temperature resistance, low temperature resistance and high pressure resistance, and shows no cracking, no falling and no bubbles at the high temperature of 350 ℃ and the low temperature of-40 ℃ and the high pressure of 70MPa, and still keeps good performances of heavy corrosion resistance, good toughness, wear resistance and the like; while also exhibiting excellent corrosion resistance.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, and a preparation method and a spraying method thereof.
Background
Besides economic loss caused by corrosion of materials, the protection of natural resources and environment is also influenced, and even the personal safety is also influenced. In order to resist corrosion, people generally carry out protection by coating materials, and the method is convenient, economical and widely applied.
Liquid coatings often use xylene as a solvent, which creates environmental pollution and compromises the safety of the workers. The weather resistance, especially the high temperature and high pressure resistance of the liquid coating can not meet the use requirements of some special working conditions. Most of common liquid anticorrosive coatings are not resistant to temperature and pressure, and need to be coated frequently, so that the anticorrosive performance is still poor.
The powder coating does not need liquid solvent, has no environmental pollution, and can be recycled, so the powder coating is widely applied. However, the technology that the powder coating can simultaneously have high temperature resistance, high pressure resistance, wear resistance and good corrosion resistance has not been a great breakthrough for a long time. At present, powder coatings on the market are also in various colors, some powder coatings need to be heated and baked for curing for the second time, and some powder coatings can be melted and fall off at the high temperature of 160 ℃. Some coatings can blister and crack at high pressures of 25 mpa. In some special working condition environments, most of liquid or powder coatings need to be subjected to secondary curing to simultaneously meet the requirements of ultrahigh temperature resistance, ultrahigh pressure resistance, abrasion resistance and heavy corrosion resistance.
Disclosure of Invention
The invention aims to provide a temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, and a preparation method and a spraying method thereof, so as to solve the problems that the existing powder coating is poor in temperature resistance, pressure resistance and corrosion resistance and difficult to solidify into a film at one time.
The technical scheme for solving the technical problems is as follows:
a temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
15-25 parts of modified epoxy resin, 5-15 parts of epoxy resin A, 5-15 parts of epoxy resin B, 10-20 parts of o-cresol formaldehyde resin, 10-20 parts of phenol formaldehyde resin, 2-6 parts of barium sulfate, 2-6 parts of white corundum, 2-6 parts of silica aerogel, 2-6 parts of mica, 1-5 parts of graphite, 1-5 parts of titanium dioxide, 1-2 parts of dimethylimidazole, 2-6 parts of a brightener, 1-5 parts of a flatting agent and 1-5 parts of benzoin.
Further, the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
17-22 parts of modified epoxy resin, 7-12 parts of epoxy resin A, 7-12 parts of epoxy resin B, 14-18 parts of o-cresol formaldehyde resin, 14-18 parts of phenol formaldehyde resin, 3-5 parts of barium sulfate, 3-5 parts of white corundum, 3-5 parts of silica aerogel, 3-5 parts of mica, 2-4 parts of graphite, 2-4 parts of titanium dioxide, 1-2 parts of dimethylimidazole, 3-5 parts of a brightener, 2-4 parts of a flatting agent and 2-4 parts of benzoin.
Further, the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
19 parts of modified epoxy resin, 8 parts of epoxy resin A, 10 parts of epoxy resin B, 16 parts of o-cresol formaldehyde resin, 16 parts of phenolic resin, 3.7 parts of barium sulfate, 3.7 parts of white corundum, 4.5 parts of silica aerogel, 3.5 parts of mica, 3 parts of graphite, 2.5 parts of titanium dioxide, 1.6 parts of dimethyl imidazole, 4.5 parts of a brightener, 3 parts of a flatting agent and 3.5 parts of benzoin.
Furthermore, in the temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating, the epoxy value of the epoxy resin A is 0.04-0.07; the epoxy value of the epoxy resin B is 0.18-0.22.
Further, in the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating further comprises 5-15 parts of an auxiliary agent; the auxiliary agent comprises: one or more of an anti-ultraviolet agent, an antioxidant and an adhesive.
The invention also provides a preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, which comprises the following steps:
uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent and benzoin uniformly according to the weight part ratio to obtain a mixture;
and fully stirring the mixed resin powder and the mixture, heating, extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
Further, in the preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, the temperature of heating and extrusion is 100-120 ℃.
Further, in the preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, the particle size of the powder coating is 40-90 μm.
The invention also provides a spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, which comprises the following steps:
the powder coating is sprayed on the sprayed pipe subjected to sand blasting in a thermal spraying mode, and the sprayed pipe is cured into a film at one time;
or the powder coating is sprayed on metal equipment subjected to rust removal treatment in an electrostatic spraying mode, and is cured into a film at one time after being baked.
Further, in the spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, the temperature for thermal spraying is 190-215 ℃;
preferably, the baking is carried out at the temperature of 190-215 ℃ for 15-25 min.
The invention has the following beneficial effects:
1. the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has extremely high temperature resistance, and does not crack, fall off or bubble at the high temperature of 350 ℃; the paint has extremely strong low temperature resistance, and does not crack, fall off or bubble at the low temperature of minus 40 ℃; the paint has extremely strong high pressure resistance, does not crack, fall off or bubble under the high pressure of 70MPa, and still maintains good performances of heavy corrosion resistance, good toughness, wear resistance and the like; while also exhibiting excellent corrosion resistance.
2. In the preparation method, the modified epoxy resin, the epoxy resin A, the epoxy resin B, the o-methyl phenolic resin and the phenolic resin are mixed to obtain mixed resin powder, and the mixed resin powder is mixed with the mixture containing the catalyst dimethyl imidazole, so that the modified epoxy resin and the o-methyl phenolic resin are prevented from being crosslinked prematurely, and the mixing of other mixtures is more uniform. The invention adopts a co-rotating twin-screw extrusion method to fluidize and disperse the powder, the dispersion level reaches the nanometer level, the minimum particle size is more than 40 mu m, the maximum particle size is less than 90 mu m, the particle size distribution surface of the powder coating is wide, and the corrosion resistance and the wear resistance of the coating can be effectively improved.
3. The spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating replaces a spraying primer with a heating mode, finishes the production spraying of an anticorrosive coating at one time by adopting a hot spraying mode at 190-215 ℃, and can be formed by natural air drying, so that processes and equipment such as cooling, drying and the like can be omitted, the spraying efficiency is improved, and the dependence on the equipment is reduced. The spraying method can also replace spraying primer by combining electrostatic spraying and baking, and the primer is baked at 190-215 ℃ for one-time curing film forming, so that the spraying efficiency is improved, the method is suitable for irregular metal equipment, and the application range of corrosion prevention is widened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows the results of the test of a sample in test example 1 of the present invention;
FIG. 2 is a graph showing the results of the test of the sample in test example 2 of the present invention;
FIG. 3 shows the results of the test of the sample in test example 4 of the present invention;
FIG. 4 shows the results of the test of the sample in test example 5 of the present invention;
FIG. 5 shows the results of the test of the sample in test example 6 of the present invention;
FIG. 6 shows the results of the test conducted on the test specimen in test example 7 of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are provided for the purpose of illustration only and are not intended to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The technical scheme of the specific implementation mode of the invention is as follows:
the embodiment provides a temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating which is mainly prepared from the following raw materials in parts by weight:
15-25 parts of modified epoxy resin, 5-15 parts of epoxy resin A, 5-15 parts of epoxy resin B, 10-20 parts of o-cresol formaldehyde resin, 10-20 parts of phenol formaldehyde resin, 2-6 parts of barium sulfate, 2-6 parts of white corundum, 2-6 parts of silica aerogel, 2-6 parts of mica, 1-5 parts of graphite, 1-5 parts of titanium dioxide, 1-2 parts of dimethyl imidazole, 2-6 parts of a brightener, 1-5 parts of a flatting agent and 1-5 parts of benzoin.
In a specific embodiment, the temperature resistance of the modified epoxy resin is greatly improved by crosslinking the modified epoxy resin and the o-cresol formaldehyde resin under the action of the catalyst dimethylimidazole. The addition of the phenolic resin further strengthens and promotes the original high-temperature resistant chemical bond. The epoxy value of the added epoxy resin A is 0.04-0.07, and the epoxy value of the added epoxy resin B is 0.18-0.22. The epoxy value is the amount of the substance containing an epoxy group in 100g of the epoxy resin, and it is in relation to the epoxy equivalent that the epoxy value = 100/epoxy equivalent, and the epoxy value is in inverse relation to the epoxy equivalent. The epoxy resin has low epoxy content, large epoxy equivalent and high viscosity, and can improve the toughness and adhesive force of the coating. The epoxy amount is high, namely the epoxy equivalent is small, the viscosity is low, and the bending resistance and the pressure resistance of the coating can be improved. The epoxy resin A and the epoxy resin B with different epoxy values are added to increase the adhesive force and toughness of the coating, so that the coating has better bending resistance and pressure resistance.
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has extremely high temperature resistance, and does not crack, fall off or bubble at the high temperature of 350 ℃; the paint has extremely strong low temperature resistance, and does not crack, fall off or bubble at the low temperature of minus 40 ℃; the paint has extremely strong high pressure resistance, does not crack, fall off or bubble under the high pressure of 70MPa, and still maintains good performances of heavy corrosion resistance, good toughness, wear resistance and the like; while also exhibiting excellent corrosion resistance.
The temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating has super-strong high temperature resistance, can solve the problem that the pipe is well antiseptic under the high-temperature operation condition in the current exploitation of special heavy oil wells in oil fields and the exploitation of ultra-deep oil wells and gas wells, and strengthens and prolongs the service life of the pipe.
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has good low-temperature resistance, can ensure that the anticorrosive coatings of metal and pipes are intact in severe working environments or regions, and improves corresponding economic benefits.
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has high pressure resistance, and can solve the problem that underground pipes are difficult to be anticorrosive under ultrahigh pressure working conditions during operation under special conditions.
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has the advantages that the sprayed coating is not softened and does not burn at the temperature lower than 400 ℃, and the coating is only carbonized at the temperature higher than 400 ℃, so that the powder coating has good flame retardant property and is not combustible. In a high-risk working environment, the coating has a certain flame-retardant effect.
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating has excellent high and low temperature resistance and high pressure resistance, and can be applied to the field of oilfield exploitation. In oil, gas and water wells of oil fields, corrosion involvesWater corrosion, crude oil corrosion and natural gas corrosion. To tubular column and ground pipeline inside in the pit, the main cause of corrosion is relevant with the water content of medium, and water is as corroding the medium, and the water content is bigger, and the corruption is more obvious. At the same time, the oxygen content, the temperature, SO4 2- Concentration, number of sulfate-reducing bacteria, sulfur content, etc., all have a significant impact on the corrosion process. Along with the continuous rising of the water content of the oil field and the continuous expansion of the produced water reinjection block, the phenomena of corrosion and scaling of the underground pipe column and the ground pipe network are obviously aggravated, the pipeline is frequently broken and leaked, the service life of the common internal corrosion prevention or seamless steel pipe network without internal corrosion prevention is obviously shortened, the workload of replacing the pipe network is large, the cost is high, and the main problem which troubles the daily production of the oil field is caused.
Most of the oil field underground oil pipes adopt weighting, anchoring and sucker rod centralizer to prevent eccentric wear; adopts the anticorrosion technologies of dip-coating and spraying of epoxy novolac, lining of PE pipes, glass fiber reinforced plastic oil pipes and the like. The PE anticorrosion lining has the problems of shrinkage, poor temperature resistance of the sliding sleeve and deformation and fracture. The epoxy varnish dip-coating inner coating oil pipe is as follows: uneven coating distribution, sagging and dripping and overproof leak points. The corrosion prevention and eccentric wear prevention mode belongs to the technology of low-end corrosion prevention and eccentric wear prevention, the product quality is unstable, the high temperature resistance is poor, the corrosion prevention and eccentric wear prevention effects are not ideal, and the production requirements of oil fields cannot be met.
The heat-resistant pressure-resistant heavy-duty anticorrosive powder coating of the present embodiment is a thermosetting powder coating having corrosion resistance and toughness, which contains 100% of solids and is applied in a powder form to form a film, and uses air as a dispersion medium. The resin material, other fillers and functional additives are organically combined to form a soft and hard combination, so that an effective protective film is arranged between the medium and the oil well pipe, and the coating has strong corrosion resistance, good wear resistance and low and high temperature resistance, can effectively protect an underground pipe column and a ground pipe network, and greatly prolongs the service life of the oil well pipe. The coating is suitable for severe corrosion areas in industries such as petroleum, petrifaction, coalification, metallurgy, pharmacy and the like, such as oil pipes, sucker rods, drill rods, downhole tools, heat exchangers, pipelines and other metal anti-corrosion coatings. Has high temperature resistance, high wear resistance and impact resistance; corrosion resistance, abrasion resistance, wax deposition resistance and scaling resistance; smooth coating and strong adhesive force. The thickness of the coating is more than or equal to 200 mu m.
In order to further improve the overall performance of the coating, barium sulfate, white corundum, aerogel, mica, graphite and titanium dioxide which are used as fillers are also added. Wherein, the silica aerogel is a gel material which takes gas as a dispersion medium, is a light nano porous solid material with controllable structure and formed by mutually conglomerating colloidal particles, has a continuous three-dimensional network structure, both the solid phase and the pore structure of the material are in nano level, the porosity can reach 80-99.8 percent, and the specific surface area can reach 1000m 2 More than g, and the density is as low as 3kg/m 3 The material is the solid material with the lowest density and the best heat insulation performance at present. Has the characteristics of good heat insulation performance, small density, low dielectric constant, high temperature resistance and the like.
In order to further improve the overall performance of the coating, a brightener serving as an auxiliary agent is also added to improve the glossiness of the coating; leveling agents are added to prevent the powder after spraying from stacking and caking. Benzoin is added as an antifoaming agent to eliminate bubbles in the coating, i.e. to eliminate the pinhole defect of the formed coating. In addition, the formula of the paint also comprises 5-15 parts of an auxiliary agent; the auxiliary agent comprises: one or more of the ultraviolet resistant agent, the antioxidant and the adhesive agent can be adjusted according to the actual requirements on the ultraviolet resistance, the oxidation resistance and the adhesive force of the coating.
The embodiment also provides a preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating, which comprises the following steps:
(1) Uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight part ratio to obtain a mixture;
(3) And fully stirring the mixed resin powder and the mixture, heating to 100-120 ℃, extruding, tabletting, cooling, crushing and sieving to obtain the powder coating with the particle size of 40-90 mu m.
In the preparation method of the embodiment, the modified epoxy resin, the epoxy resin a, the epoxy resin B, the o-methyl phenol formaldehyde resin and the phenol formaldehyde resin are mixed to obtain the mixed resin powder, and the mixed resin powder is mixed with the mixture containing the catalyst dimethyl imidazole, so that premature crosslinking of the modified epoxy resin and the o-methyl phenol formaldehyde resin is avoided, and the mixing of other mixed materials is more uniform. The preparation method of the embodiment adopts a co-rotating twin-screw extrusion method to fluidize and disperse the powder, the dispersion level reaches the nanometer level, the minimum particle size is more than 40 mu m, the maximum particle size is less than 90 mu m, the particle size distribution surface of the powder coating is wide, and the corrosion resistance and the wear resistance of the coating can be effectively improved.
The spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
the pipe body is subjected to sand blasting treatment by adopting powder coating190～215℃Carrying out thermal spraying at the temperature, and curing the outer wall and inner wall coating of the pipe body into a film in one step by adopting a thermal spraying mode of the pipe;
or, after the metal equipment is derusted, spraying the powder coating on the surface of the metal by using an electrostatic spraying method, then baking the sprayed workpiece at 190-215 ℃ for 15-25 min, and curing to form a film at one time.
The spraying mode of this embodiment can guarantee coating spraying back surface smoothness and thickness, and the tubular product body directly gets into the production spraying, improves production progress and spraying efficiency. Abandoning the spraying of primer, improving the heating mode, completing the production spraying of the anticorrosive coating by adopting a thermal spraying mode at 190-215 ℃, and forming by natural air drying (omitting processes and equipment such as cooling, drying and the like). The spraying mode of the embodiment can also be that electrostatic spraying and baking are combined to replace spraying of the primer, the primer is baked at 190-215 ℃ for one-time curing film forming, the spraying efficiency is improved, the method is suitable for irregular metal equipment, and the application range of corrosion prevention is widened.
Temperature-resistant, pressure-resistant and heavy-duty anticorrosive powder coating in the embodiment can be purchased, and the type of the modified epoxy resin is 803U: the type of the epoxy resin A is 017: the type of the epoxy resin B is 904; the model of the o-cresol formaldehyde resin is 208; the phenolic resin was model number 6812.
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
Example 1:
the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
15 parts of modified epoxy resin, 5 parts of epoxy resin A, 5 parts of epoxy resin B, 10 parts of o-cresol formaldehyde resin, 10 parts of phenolic resin, 2 parts of barium sulfate, 2 parts of white corundum, 2 parts of silica aerogel, 2-6 parts of mica, 1 part of graphite, 1 part of titanium dioxide, 1 part of dimethyl imidazole, 2 parts of a brightener, 1 part of a leveling agent and 1 part of benzoin.
The preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
(1) Uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight part ratio to obtain a mixture;
(3) And fully stirring the mixed resin powder and the mixture, heating to 100 ℃, extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
Example 2:
the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
17 parts of modified epoxy resin, 7 parts of epoxy resin A, 7 parts of epoxy resin B, 14 parts of o-cresol formaldehyde resin, 14 parts of phenolic resin, 3 parts of barium sulfate, 3 parts of white corundum, 3 parts of silica aerogel, 3 parts of mica, 2 parts of graphite, 2 parts of titanium dioxide, 1 part of dimethyl imidazole, 3 parts of a brightener, 2 parts of a leveling agent and 2 parts of benzoin.
The preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
(1) Uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight parts to obtain a mixture;
(3) And fully stirring the mixed resin powder and the mixture, heating to 105 ℃, extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
Example 3:
the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
19 parts of modified epoxy resin, 8 parts of epoxy resin A, 10 parts of epoxy resin B, 16 parts of o-cresol formaldehyde resin, 16 parts of phenolic resin, 3.7 parts of barium sulfate, 3.7 parts of white corundum, 4.5 parts of silica aerogel, 3.5 parts of mica, 3 parts of graphite, 2.5 parts of titanium dioxide, 1.6 parts of dimethyl imidazole, 4.5 parts of a brightener, 3 parts of a flatting agent and 3.5 parts of benzoin.
The preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
(1) Uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight part ratio to obtain a mixture;
(3) Fully stirring the mixed resin powder and the mixed material, and heating to the temperature110℃Extruding, tabletting, cooling, pulverizing, and sievingTo obtain the powder coating.
Example 4:
the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight: 22 parts of modified epoxy resin, 12 parts of epoxy resin A, 12 parts of epoxy resin B, 18 parts of o-cresol formaldehyde resin, 18 parts of phenolic resin, 5 parts of barium sulfate, 5 parts of white corundum, 5 parts of silica aerogel, 5 parts of mica, 4 parts of graphite, 4 parts of titanium dioxide, 2 parts of dimethyl imidazole, 5 parts of a brightener, 4 parts of a leveling agent and 4 parts of benzoin.
The preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating comprises the following steps:
(1) Uniformly mixing and dispersing the modified epoxy resin, the epoxy resin A, the epoxy resin B, the o-cresol formaldehyde resin and the phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight parts to obtain a mixture;
(3) Fully stirring the mixed resin powder and the mixed material, and heating to the temperature115℃Extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
Example 5:
the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is mainly prepared from the following raw materials in parts by weight:
25 parts of modified epoxy resin, 15 parts of epoxy resin A, 15 parts of epoxy resin B, 20 parts of o-cresol formaldehyde resin, 20 parts of phenolic resin, 6 parts of barium sulfate, 6 parts of white corundum, 6 parts of silica aerogel, 6 parts of mica, 5 parts of graphite, 5 parts of titanium dioxide, 2 parts of dimethyl imidazole, 6 parts of a brightener, 5 parts of a leveling agent and 5 parts of benzoin.
The preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
(1) Uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
(2) Mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent, benzoin and an auxiliary agent uniformly according to the weight part ratio to obtain a mixture;
(3) Fully stirring the mixed resin powder and the mixed material, and heating to the temperature120℃Extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
In examples 1 to 5 of the present application, 5 parts, 7 parts, 10 parts, 12 parts or 15 parts of an auxiliary may be further added. The auxiliary agent comprises one or more of an anti-ultraviolet agent, an antioxidant and an adhesive agent, and specifically, the auxiliary agent can be selected from the following components: the auxiliary agent is an anti-ultraviolet agent; the auxiliary agent is an antioxidant; the auxiliary agent is an adhesive; the auxiliary agent is a mixture of an ultraviolet resistant agent and an antioxidant; the auxiliary agent is a mixture of an anti-ultraviolet agent and an adhesive agent; the auxiliary agent is formed by mixing an antioxidant and an adhesive; the auxiliary agent is selected by mixing an anti-ultraviolet agent, an antioxidant and an adhesive.
Example 6
The spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
the pipe body was subjected to sand blasting, and the powder coating prepared in any of examples 1 to 5 was thermally sprayed at a temperature of 190 to 215 ℃ to allow the outer wall and the inner wall of the pipe body to be coated by thermal spraying and cured into a film at one time.
Example 7
The spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating comprises the following steps:
after rust removal of metal equipment, spraying the powder coating prepared in any one of the embodiments 1-5 on the surface of metal by using an electrostatic spraying method, then baking the sprayed workpiece at 190-215 ℃ for 15-25 min, and curing to form a film at one time.
Test example 1: high and low temperature resistance test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating prepared in example 3 is sprayed on a sample according to the spraying method of example 6 to perform high and low temperature resistance tests, wherein the high temperature resistance tests are performedThe method comprises spraying the coating on the surface of the sample, placing in a baking oven, setting the temperature of the baking oven at 350 deg.C, heating to the set temperature, maintaining the temperature for 3-5 min, shutting down the baking oven, taking out the sample when the temperature returns to normal temperature, observingCoating layer. The low temperature resistance test method comprises the steps of placing a sprayed sample into refrigeration equipment, setting the temperature to be minus 40 ℃ or minus 30 ℃, keeping the temperature for 3-5 minutes when the temperature is reduced to minus 40 ℃ or minus 30 ℃, shutting down the refrigeration equipment, taking out the sample, and observing a coating. The observation results are shown in table 1 and fig. 1.
TABLE 1
Test example 2: pressure resistance test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating prepared in example 3 was sprayed on sample 1 and sample 2 according to the spraying method of example 6, and the environment was monitored: the temperature is 20-23 ℃; relative humidity: (46-52)% RH. Under the detection conditions: naOH solution, pH 12.5: temperature 148 ℃, pressure 70MPa, time: 24h, completely immersing the test piece in the liquid and using gas N 2 The results of the pressurization and testing are shown in table 2 and fig. 2.
TABLE 2
Test example 3: pressure resistance test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
The performance of the temperature-resistant, pressure-resistant and heavy-duty anticorrosive powder coating prepared in example 3 was measured according to Q/SH10201942-2018 "general technical conditions for antiwear and anticorrosive oil pipe", and the results are shown in table 3.
TABLE 3
The result shows that according to the detection of Q/SH10201942-2018 general technical conditions of antiwear and anticorrosion oil pipes, the temperature-resistant and pressure-resistant heavy anticorrosion powder coating of the embodiment has impact resistance: impact 3 times with 6J kinetic energy without leakage point; abrasion resistance (shakeout method): 2.9L/mum; coating adhesion (prying method, 75 ℃ x 24 h): grade 1; bending resistance (1.5 ° -16 °): no crack is generated; high temperature and high pressure resistance test: pouring victory saline water into the high-temperature high-pressure kettle, pressurizing to 35MPa, heating to 107 ℃, keeping for 16h, cooling to normal temperature for inspection, wherein the coating has no bubbles, and carrying out an adhesion test by a prying method, wherein the adhesion has no change in chemical-resistant medium: respectively at 10% HCL, 10% H 2 SO 4 3.5% NaCl, 10% NaOH, 80 ℃ sewage, crude oil and other media, and the above items were all acceptable without loss of gloss, discoloration, bubbling, spotting, shedding and the like.
Test example 4: bending test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
After the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating prepared in example 3 was sprayed on the sections of large pipes and small pipes according to the spraying method in example 6, the coating was cured at a bending degree: 3-5 degrees; temperature: bending tests were carried out at-20 ℃ and the results are shown in FIG. 3.
As can be seen from FIG. 3, the cross sections of the large pipe and the small pipe after the bending test are sprayed without falling off and cracking.
Test example 5: stamping test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
The temperature and pressure resistant heavy duty anticorrosive powder coating prepared in example 3 was sprayed on the plate according to the spraying method of example 6, and subjected to a 1.5T high power press test on a flat surface, and the results are shown in fig. 4.
As can be seen from FIG. 4, the plate after the punching test has no peeling or cracking phenomenon after the spraying.
Test example 6: autoclave test of temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating prepared in example 3 was sprayed on a sample according to the spraying method of example 6 to perform an autoclave experiment in a gas phase: 16% of hydrogen sulfide, 5% of carbon dioxide and 79% of nitrogen; organic phase: toluene: kerosene =1:1 (volume ratio); water phase: 3% NaCl test conditions. The results of the experiment are shown in FIG. 5.
As can be seen from fig. 5a, at total pressure: 35Mpa, temperature: 140 ℃, test time: the pressure was rapidly reduced at 169 hours and the adhesion tested was class a.
From fig. 5b, it can be seen that at total pressure: 10Mpa, temperature: 100 ℃, test time: the 720 hour condition was rapidly depressurized and the adhesion tested was class a.
Test example 7: wear resistance test of temperature-resistant pressure-resistant heavy-duty anticorrosion powder coating
The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating prepared in example 3 was sprayed on a sample according to the spraying method of example 6, and a wear resistance test was performed by an instrument TABER abrader under a friction wheel of 1000g/5000 revolutions/CS 17, and the results are shown in FIG. 6.
As can be seen from FIG. 6, the wear was 65mg or less, showing excellent wear resistance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating is characterized by mainly comprising the following raw materials in parts by weight:
15-25 parts of modified epoxy resin, 5-15 parts of epoxy resin A, 5-15 parts of epoxy resin B, 10-20 parts of o-cresol formaldehyde resin, 10-20 parts of phenol formaldehyde resin, 2-6 parts of barium sulfate, 2-6 parts of white corundum, 2-6 parts of silica aerogel, 2-6 parts of mica, 1-5 parts of graphite, 1-5 parts of titanium dioxide, 1-2 parts of dimethylimidazole, 2-6 parts of a brightener, 1-5 parts of a flatting agent and 1-5 parts of benzoin.
2. The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to claim 1, characterized by mainly comprising the following raw materials in parts by weight:
17-22 parts of modified epoxy resin, 7-12 parts of epoxy resin A, 7-12 parts of epoxy resin B, 14-18 parts of o-cresol formaldehyde resin, 14-18 parts of phenol formaldehyde resin, 3-5 parts of barium sulfate, 3-5 parts of white corundum, 3-5 parts of silica aerogel, 3-5 parts of mica, 2-4 parts of graphite, 2-4 parts of titanium dioxide, 1-2 parts of dimethyl imidazole, 3-5 parts of a brightener, 2-4 parts of a flatting agent and 2-4 parts of benzoin.
3. The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to claim 2, characterized by mainly comprising the following raw materials in parts by weight:
19 parts of modified epoxy resin, 8 parts of epoxy resin A, 10 parts of epoxy resin B, 16 parts of o-cresol formaldehyde resin, 16 parts of phenol formaldehyde resin, 3.7 parts of barium sulfate, 3.7 parts of white corundum, 4.5 parts of silicon dioxide aerogel, 3.5 parts of mica, 3 parts of graphite, 2.5 parts of titanium dioxide, 1.6 parts of dimethyl imidazole, 4.5 parts of brightener, 3 parts of flatting agent and 3.5 parts of benzoin.
4. The temperature and pressure resistant heavy duty anticorrosive powder coating of any one of claims 1 to 3, wherein the epoxy value of the epoxy resin A is 0.04 to 0.07; the epoxy value of the epoxy resin B is 0.18-0.22.
5. The temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to any one of claims 1 to 3, further comprising 5 to 15 parts of an auxiliary agent; the auxiliary agent comprises: one or more of an anti-ultraviolet agent, an antioxidant and an adhesive.
6. A preparation method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
uniformly mixing and dispersing modified epoxy resin, epoxy resin A, epoxy resin B, o-cresol formaldehyde resin and phenolic resin according to the weight part ratio to obtain mixed resin powder;
mixing and dispersing barium sulfate, white corundum, silicon dioxide aerogel, mica, graphite, titanium dioxide, dimethyl imidazole, a brightener, a leveling agent and benzoin uniformly according to the weight part ratio to obtain a mixture;
and fully stirring the mixed resin powder and the mixture, heating, extruding, tabletting, cooling, crushing and sieving to obtain the powder coating.
7. The method for preparing the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to claim 6, characterized in that the temperature of heating extrusion is 100-120 ℃.
8. The method for preparing the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to claim 6, wherein the particle size of the powder coating is 40 to 90 μm.
9. A spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
the powder coating is sprayed on the sprayed pipe subjected to sand blasting in a thermal spraying mode, and the sprayed pipe is cured into a film at one time;
or the powder coating is sprayed on metal equipment subjected to rust removal treatment in an electrostatic spraying mode, and is cured into a film at one time after being baked.
10. The spraying method of the temperature-resistant pressure-resistant heavy-duty anticorrosive powder coating according to claim 9, characterized in that the temperature at which the thermal spraying is performed is 190-215 ℃;
preferably, the baking is carried out at the temperature of 190-215 ℃ for 15-25 min.
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| CN116716021A (en) * | 2023-06-20 | 2023-09-08 | 江苏玉龙泰祜新材料科技有限公司 | High-wear-resistance powder inner coating paint for oil sleeve and preparation method thereof |
| CN116855150A (en) * | 2023-07-04 | 2023-10-10 | 江苏玉龙泰祜新材料科技有限公司 | Powder coating for inner coating of conveying pipeline and preparation method thereof |
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