CN111187554A - Anticorrosive paint for large-diameter high-temperature-resistant thermal steel pipe and spraying method - Google Patents
Anticorrosive paint for large-diameter high-temperature-resistant thermal steel pipe and spraying method Download PDFInfo
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- CN111187554A CN111187554A CN202010145907.2A CN202010145907A CN111187554A CN 111187554 A CN111187554 A CN 111187554A CN 202010145907 A CN202010145907 A CN 202010145907A CN 111187554 A CN111187554 A CN 111187554A
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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
- 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
- B05D3/0254—After-treatment
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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
- B05D3/04—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 exposure to gases
- B05D3/0486—Operating the coating or treatment in a controlled atmosphere
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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
- B05D3/12—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 mechanical means
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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
- B05D7/146—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 to metallic pipes or tubes
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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
- 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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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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
- B05D2504/00—Epoxy polymers
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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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- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K2201/00—Specific properties of additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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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Abstract
The invention discloses an anticorrosive paint for a large-caliber high-temperature-resistant thermal steel pipe and a spraying method thereof. According to the invention, by adding the graphene and the coupling agent, the service temperature of the thermal steel pipe in a high-pressure high-temperature wet state can reach 180 ℃, the thickness of a dry film is only 80-250 um, the coating has no defects and strong adhesive force, the adhesive force of the coating is more than or equal to 12MPa when a pull-open method is used for testing, the temperature resistance and the adhesive force of the high-temperature-resistant inner anti-corrosion coating steel pipe are greatly improved, and the coating is thinned to save the cost.
Description
The technical field is as follows:
the invention relates to the technical field of thermal pipes, in particular to an anticorrosive paint for a large-caliber high-temperature-resistant thermal steel pipe and a spraying method.
Background art:
the heating pipeline is an important component of municipal heating and mainly conveys high-temperature high-pressure water and steam. The thermal steel pipe is in service in a high-temperature medium environment for a long time, so that the wall thickness of the steel pipe is easily reduced, the roughness of the inner wall is increased, the pipeline is easily blocked, the water quality is deteriorated, the pressure bearing capacity is reduced if the thermal steel pipe is heavy, the strength requirement cannot be met, and leakage and pipe explosion are frequently caused. The inner wall of the thermal steel pipe is complex to corrode, and is corroded by water and a plurality of dirt impurities, and is corroded by diversification such as oxidation, chemistry and the like. The temperature is an important factor of pipe network corrosion, the higher the temperature is, the faster the corrosion rate is, generally, the corrosion rate is accelerated by 1 time when the temperature is increased by 10 degrees, at present, because a heat-resistant coating and a coating process suitable for the working condition of a thermal steel pipe are not available, a thermal pipeline is not generally used as an inner anti-corrosion coating, and the traditional pipeline coating mainly comprises epoxy phenolic paint, organic silicon heat-resistant paint, inorganic zinc-rich paint, aluminum powder silicone paint and the like. The traditional pipeline paints have some limitations, such as poor high temperature resistance, easy pulverization, color change, poor coating toughness, brittle paint film, poor adhesion with a substrate when meeting high temperature and high pressure, easy cracking, foaming and falling off, or high temperature curing, difficult film forming and unsuitability for on-site joint coating operation. Therefore, the traditional pipeline paint cannot simultaneously meet the excellent effects of high temperature resistance, high pressure resistance, wet water resistance, corrosion resistance, strong adhesive force and convenience for on-site joint coating construction of the thermal steel pipe.
The application of the high-temperature-resistant, resistance-reducing and energy-saving heavy-duty anticorrosive coating published in 2018 is CN108912963A, the application of the high-temperature-resistant, resistance-reducing and energy-saving heavy-duty anticorrosive coating published in 2018 is similar to the invention patent published in 2018 with the publication CN108912964A, the name of the high-temperature-resistant, resistance-reducing and energy-saving heavy-duty anticorrosive coating for the inner wall of a heat pipeline is similar to that of the high-temperature-resistant, resistance-reducing and energy-saving heavy-duty anticorrosive coating for the inner wall of the heat pipeline, the epoxy equivalent of the organic silicon epoxy hybrid resin is about 450(g/eq), the highest high-temperature-resistant example is only 130 ℃, the coating thickness of a.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides an anticorrosive coating and a spraying method for a large-caliber high-temperature-resistant thermal steel pipe, after factory coating, the wet high temperature resistance of the large-caliber high-temperature-resistant internal-corrosion-resistant thermal steel pipe can reach over 180 ℃, the thickness of a dry film after coating is 80-250 micrometers, the adhesive force (a drawing method) of the coating is more than or equal to 12MPa, the temperature resistance and the adhesive force of the high-temperature-resistant internal-corrosion-resistant coating steel pipe under high pressure are greatly improved, and the coating is greatly thinned to save the cost.
In order to achieve the purpose, the invention adopts the technical scheme that: an anticorrosive coating for a large-caliber high-temperature-resistant thermal steel pipe comprises a base material and a curing agent, wherein the base material comprises organic silicon epoxy resin, phenolic epoxy resin, graphene, a coupling agent, zinc phosphate + aluminum phosphate, mica powder + talcum powder + titanium dioxide, an antifoaming agent + a dispersing agent + a hydrophobic agent + a rheological agent; the anticorrosive paint comprises the following components in percentage by mass: 20-25 wt% of organic silicon epoxy resin, 20 wt% of novolac epoxy resin, 5-10 wt% of graphene, 10 wt% of coupling agent, 8 wt% of zinc phosphate and aluminum phosphate, 21 wt% of mica powder, talcum powder and titanium dioxide, 10 wt% of defoaming agent, dispersing agent, hydrophobic agent and rheological agent and 4 wt% of curing agent.
The spraying method of the anticorrosive paint for the large-caliber high-temperature-resistant thermal steel pipe comprises the following steps: respectively preheating the base material and the curing agent before spraying the steel pipe; then, fully mixing the base material and an amine curing agent to obtain an anticorrosive coating, and removing dust, slag and sand grains on the surface of the steel pipe by using the steel pipe with a rust removal grade of Sa2.5 and an anchor line depth of 40-70 mu m; and finally, spraying the anticorrosive paint on the surface of the steel pipe by using a high-pressure airless spraying pump, keeping the surface temperature of the steel pipe above 10 ℃ during spraying, keeping the surface temperature above 3 ℃ of the dew point temperature, keeping the relative humidity less than or equal to 85%, keeping the pressure of a spraying gun nozzle at 28-32 MPa, keeping the distance between a spray gun and the inner wall of the pipe at 300-500 mm, controlling the spraying speed at 4-6 m/min, controlling the thickness of a dry film at 80-250 mu m, and carrying out curing treatment after spraying, wherein the normal-temperature curing or the curing temperature is controlled at 40-70 ℃.
The invention has the beneficial effects that:
1. the high-temperature-resistant anticorrosive coating for the thermal power pipeline takes organic silicon-phenolic aldehyde-epoxy ternary resin as a base, and organic silicon (excellent thermal oxidation stability) modification is carried out on the epoxy resin (with strong adhesive force), so that the chemical resistance of phenolic aldehyde is taken into consideration, and the temperature resistance of the coating is greatly improved. The graphene has strong anti-seepage and chemical inertness to water and wet oxygen in air when a thermal pipeline is in no-load, the epoxy silane coupling agent and the phosphate coupling agent adhesion promoter are added, the humidity and heat resistance of the coating is improved, and the restriction that the working temperature of an inner coating which is subject to organosilicon epoxy resin and novolac epoxy resin is only limited to 130 ℃ when the graphene and the coupling agent are not added is broken through. The high-pressure high-temperature wet-state use temperature of the invention can reach more than 180 ℃, the glass transition temperature (Tg2) of the coating reaches 189 ℃ through DSC test, the thermal decomposition temperature of the coating reaches more than 330 ℃ through TGA test, the simulation test is carried out in a high-temperature high-pressure autoclave, 10 periods are repeatedly simulated under the working condition of 200 ℃/10MPa/168 h/deionized water (flow rate 4m/min), the coating is perfect, and the phenomena of foaming, cracking and falling off are avoided, and the temperature is far higher than the actual or instant operation temperature of a thermal pipeline.
2. The thickness of the dry film is only 80-250 um, the coating has no defects and strong adhesive force, the adhesive force of the coating is more than or equal to 12MPa by a pull-open method, the temperature resistance and the adhesive force of the high-temperature-resistant inner anti-corrosion coating steel pipe are greatly improved, and the coating is thinned to save the cost.
3. The anticorrosive paint is used for a heat-supply large-caliber high-temperature-resistant internal-corrosion-resistant thermal steel pipe, so that the steel pipe has the excellent effects of high temperature resistance, high pressure resistance, wet water resistance, corrosion resistance, strong adhesive force and convenience for on-site joint coating construction, and the paint can be cured at a normal temperature by two components and can also be cured by baking.
The specific implementation mode is as follows:
the invention is described in further detail below: taking the spraying of L360M steel grade phi 1620 multiplied by 23mm large caliber high temperature resistant inner anti-corrosion thermal steel pipe as an example.
Firstly, the working steel pipe adopts L360M steel grade 1620 mm by 23mm steel coil raw material. According to the yield strength level of a coiled plate material object, after forming and prewelding in an external control forming mode, a working steel pipe is respectively moved to an inner welding area and an outer welding area for welding, then the pipe end is subjected to warp expanding, 100% hydrostatic pressure, groove machining, ultrasonic inspection, X-ray inspection and appearance size inspection are carried out, good size precision is guaranteed after the large-caliber spiral welded pipe is formed, and later-stage coating quality is guaranteed.
Secondly, the anticorrosive paint in the working steel pipe comprises the following components in percentage by mass: 20-25 wt% of organic silicon epoxy resin, 20 wt% of novolac epoxy resin, 5-10 wt% of graphene, 10 wt% of coupling agent, 8 wt% of zinc phosphate and aluminum phosphate, 10 wt% of mica powder, 21 wt% of talcum powder, 10 wt% of defoaming agent, dispersing agent, hydrophobic agent and rheological agent and 4 wt% of amine curing agent.
The base material is based on organosilicon-phenolic aldehyde-epoxy ternary resin, graphene and a coupling agent are simultaneously added, the epoxy equivalent of the organosilicon epoxy resin is about 1000(g/eq), the coupling agent preferably adopts an epoxy silane coupling agent and a phosphate ester coupling agent, and the content of the epoxy silane coupling agent and the content of the phosphate ester coupling agent are respectively half of the content of the epoxy silane coupling agent and the phosphate ester coupling agent.
The following are the functions of the components in the anticorrosive paint of the invention:
1) the ideal molecular chain of the organic silicon epoxy resin is prepared by polycondensation, heat-resistant organic silicon is introduced into an epoxy group, the epoxy equivalent of the organic silicon epoxy resin is controlled to be about 1000(g/eq), the molecular weight of the resin is controlled, the hydroxyl (-OH) and ether bond (-O-) of a polar group are ensured to fully react with active hydrogen on the surface of a steel pipe, and the cohesive force and the adhesive property of the resin are increased.
2) The ideal molecular chain of the novolac epoxy resin is prepared by polycondensation, the benzene ring endows the resin with heat resistance and wear resistance rigidity, and the ether bond enables the molecular chain to have flexibility, the crosslinking density of a plurality of functional groups is high, and the water resistance is good.
3) The tensile strength of the graphene is 200 times that of iron, the high mechanical strength and the wear resistance of the coating are improved, the history of the friction coefficient is lowest, the surface is smooth at an atomic level, and the graphene has strong anti-seepage and chemical inertness to wet oxygen in air when water and a thermal pipeline are in no-load. The nano-scale ultrathin flake graphene is introduced, and the coating is overlapped, tiled and directionally arranged after being formed into a film, so that the permeation distance is prolonged, hot water permeates into a zigzag slit diffusion process, and the moisture resistance and water resistance of the coating are improved.
4) The silane coupling agent not only improves the dispersion uniformity of the graphene and the matrix epoxy resin, but also obviously improves the paint film adhesive force of the organic silicon resin.
5) Aluminum phosphate is optionally modified to ensure that Al is fused with Fe on the surface of the steel pipe to generate a Si-0-Al (Fe) silicate inorganic compound coating, and the zinc phosphate powder and the surface of the steel pipe form Me (metal) -Zn-P2O5The passive film is compact, and the coating adhesion and corrosion resistance are further enhanced.
6) The addition of titanium dioxide improves the temperature resistance of the coating, and not only has light color, brightness and large covering power, but also can increase the integrity of the coating.
7) The chemical component of mica powder is mainly K2O·3Al2O3·6SiO2·2H2And O, mica powder is an ultra-flaky filler, and the moisture resistance of the coating is improved like flaky graphene.
8) The chemical component of the talcum powder is mainly 3 MgO.4SiO2·H2And O, the coefficient of expansion of the coating is matched with that of the steel pipe, the linear expansion coefficient of the coating is changed, and the high-low temperature alternating property and the cracking resistance at high temperature of the coating are improved.
9) The curing agent is amine, and various amines and resins with certain active groups are determined by epoxy groups and can be crosslinked and cured.
The preparation method of the base material comprises the steps of firstly filling the organic silicon epoxy resin, the novolac epoxy resin, the graphene, the coupling agent, the defoaming agent and the dispersing agent into a reaction kettle according to the mass percentage, adding the hydrophobic agent and the rheological agent while stirring to uniformly disperse the materials without particle agglomeration, then adding the zinc phosphate, the aluminum phosphate, the mica powder, the talcum powder and the titanium dioxide, dispersing for 30 minutes, grinding for 20-30 minutes by using a sand mill until the fineness is qualified, and dispersing at a high speed to obtain the base material.
And thirdly, the high-temperature-resistant internal-corrosion-resistant heat distribution pipeline is mainly formed by adopting spraying, film forming and curing processes. Preheating the base material and the amine curing agent respectively; and then, fully mixing the base material and an amine curing agent to obtain the anticorrosive paint, and removing dust, slag and sand grains on the surface of the steel pipe by using the steel pipe with the rust removal grade Sa2.5 and the anchor line depth of 50-60 mu m. And a high-pressure airless spraying pump is adopted, the surface temperature of the steel pipe is kept above 10 ℃ during spraying, the surface temperature is higher than the dew point temperature by more than 3 ℃, and the relative humidity is less than or equal to 85%. The pressure of a spraying gun nozzle is 30MPa, the distance between a spray gun and the inner wall of the pipe is 350mm, the spraying is carried out for three times, the spraying speed of the first spraying is 4m/min, and the thickness of a dry film is 80-150 mu m; the spraying speed of the second spraying is 5m/min, and the thickness of the dry film reaches 130-200 um; the spraying speed of the third spraying is 6m/min, the thickness of the dry film is 150-250 um, curing treatment is carried out after the spraying is finished, and the temperature of normal-temperature curing or rapid curing is controlled to be 40-70 ℃.
Fourthly, the main performance test of the anticorrosive coating of the L360M steel-grade phi 1620 multiplied by 23mm high-temperature resistant internal anticorrosive thermal steel pipe is shown in Table 1: therefore, the main performance detection result of the large-caliber high-temperature-resistant internal-corrosion-resistant thermal steel pipe object is compared with the main performance requirement of the L360M steel-grade phi 1620 multiplied by 23mm large-caliber high-temperature-resistant internal-corrosion-resistant thermal steel pipe, the inner wall of the L360M steel-grade phi 1620 multiplied by 23mm large-caliber high-temperature-resistant internal-corrosion-resistant thermal steel pipe manufactured by the technology has the excellent effects of high temperature resistance, high pressure resistance, wet water resistance, corrosion resistance, strong adhesive force, convenience for field construction and the like, and the inner wall is corrosion-resistant and heat-insulating and is suitable for thermal heat insulating pipeline operation.
TABLE 1L360M STEEL GRADE Phi 1620 mm X23 mm high-temp. RESISTANCE OF ANTICORROSIVE THERMOELECTRIC STEEL PIPE ANTICORROSIVE COATING
Claims (3)
1. An anticorrosive paint for a large-caliber high-temperature-resistant thermal steel pipe is characterized in that: the coating comprises a base material and a curing agent, wherein the base material comprises organic silicon epoxy resin, phenolic epoxy resin, graphene, a coupling agent, zinc phosphate and aluminum phosphate, mica powder, talcum powder, titanium dioxide, a defoaming agent, a dispersing agent, a hydrophobic agent and a rheological agent; the anticorrosive paint comprises the following components in percentage by mass: 20-25 wt% of organic silicon epoxy resin, 20 wt% of novolac epoxy resin, 5-10 wt% of graphene, 10 wt% of coupling agent, 8 wt% of zinc phosphate and aluminum phosphate, 21 wt% of mica powder, talcum powder and titanium dioxide, 10 wt% of defoaming agent, dispersing agent, hydrophobic agent and rheological agent and 4 wt% of curing agent.
2. The anticorrosive paint for large-caliber high-temperature-resistant thermal steel pipes according to claim 1, characterized in that: the coupling agent adopts epoxy silane coupling agent and phosphate ester coupling agent, and the content of the epoxy silane coupling agent and the content of the phosphate ester coupling agent are respectively half.
3. A spraying method of an anticorrosive paint for a large-caliber high-temperature-resistant thermal steel pipe according to claim 1 or 2, characterized in that: the method comprises the following steps: respectively preheating the base material and the curing agent before spraying the steel pipe; then, fully mixing the base material and a curing agent to obtain an anticorrosive coating, and removing dust, slag and sand grains on the surface of the steel pipe by using the steel pipe with a rust removal grade of Sa2.5 and an anchor line depth of 40-70 mu m; and finally, spraying the anticorrosive paint on the surface of the steel pipe by using a high-pressure airless spraying pump, keeping the surface temperature of the steel pipe above 10 ℃ during spraying, keeping the surface temperature above 3 ℃ of the dew point temperature, keeping the relative humidity less than or equal to 85%, keeping the pressure of a spraying gun nozzle at 28-32 MPa, keeping the distance between a spray gun and the inner wall of the pipe at 300-500 mm, controlling the spraying speed at 4-6 m/min, controlling the thickness of a dry film at 80-250 mu m, and carrying out curing treatment after spraying, wherein the normal-temperature curing or the curing temperature is controlled at 40-70 ℃.
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| CN202010145907.2A CN111187554A (en) | 2020-03-05 | 2020-03-05 | Anticorrosive paint for large-diameter high-temperature-resistant thermal steel pipe and spraying method |
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| CN202010145907.2A CN111187554A (en) | 2020-03-05 | 2020-03-05 | Anticorrosive paint for large-diameter high-temperature-resistant thermal steel pipe and spraying method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112266707A (en) * | 2020-10-13 | 2021-01-26 | 清华大学深圳国际研究生院 | High-temperature-resistant solvent-free epoxy primer for radiation crosslinking polypropylene thermal contraction belt |
Citations (5)
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