CN111842071A - On-site coating method for epoxy coating of steel pipeline - Google Patents
On-site coating method for epoxy coating of steel pipeline Download PDFInfo
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- CN111842071A CN111842071A CN202010758623.0A CN202010758623A CN111842071A CN 111842071 A CN111842071 A CN 111842071A CN 202010758623 A CN202010758623 A CN 202010758623A CN 111842071 A CN111842071 A CN 111842071A
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- epoxy coating
- steel pipeline
- pipeline
- primer
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 92
- 238000000576 coating method Methods 0.000 title claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000007689 inspection Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000005498 polishing Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000002987 primer (paints) Substances 0.000 claims description 38
- 239000005002 finish coating Substances 0.000 claims description 18
- 239000004519 grease Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000011065 in-situ storage Methods 0.000 claims description 9
- 150000001412 amines Chemical class 0.000 claims description 6
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000004843 novolac epoxy resin Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 239000000049 pigment Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000004721 Polyphenylene oxide Chemical class 0.000 claims description 3
- 125000002723 alicyclic group Chemical group 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 229920000570 polyether Chemical class 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims 3
- 230000000996 additive effect Effects 0.000 claims 3
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000012752 auxiliary agent Substances 0.000 description 9
- 230000008439 repair process Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- -1 chemical production Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- B05D5/005—Repairing damaged coatings
-
- 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
- B05D3/002—Pretreatement
-
- 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
- B05D3/007—After-treatment
-
- 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
-
- 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
- B05D7/16—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 using synthetic lacquers or varnishes
-
- 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
- B05D7/22—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 internal surfaces, e.g. of tubes
- B05D7/222—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 internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
-
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- C09D163/04—Epoxynovolacs
-
- 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
- B05D2202/15—Stainless steel
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The embodiment of the invention relates to the field of steel pipeline surface treatment, and particularly discloses a steel pipeline epoxy coating on-site repairing coating method, which comprises the following specific steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coat of toughened modified resin on the surface of the primer coat to form a flexible modified finish coat; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection. The embodiment of the invention can conveniently carry out on-site coating and epoxy coating on the surface of the steel pipeline, and is convenient to use.
Description
Technical Field
The invention relates to the field of steel pipeline surface treatment, in particular to a steel pipeline epoxy coating on-site coating supplementing method.
Background
The steel pipeline is an important channel in the production and operation process of petroleum, chemical production, petroleum gathering and transportation, water supply and gas supply systems, and has wide application range and great using amount. In order to improve the corrosion resistance of steel pipelines and prolong the service life of the pipelines, the inner and outer surfaces of the pipelines are usually treated and coated with anticorrosive coatings. At present, steel pipe anticorrosive coatings adopted on site are various, wherein epoxy powder coated steel pipes are increasingly applied due to the advantages of excellent mechanical properties, acid and alkali resistance, corrosion resistance, good corrosion resistance and the like, and the demand is increasingly large. However, the existing steel pipeline can cause the problem that the epoxy coating partially falls off after being used for a long time, so that a field coating method of the epoxy coating of the steel pipeline is needed.
Disclosure of Invention
The invention aims to provide a field repair coating method for an epoxy coating of a steel pipeline, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme:
an on-site recoating method for an epoxy coating of a steel pipeline comprises the following specific steps:
s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating;
s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated;
s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine;
s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating;
s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
As a further limitation of the technical solution of the embodiment of the present invention, the step S100 of performing the appearance inspection on the steel pipe includes the following specific steps: s110: placing the steel pipeline on a detection platform; s120: and inspecting the surface of the steel pipeline placed on the detection platform.
As a further limitation of the technical solution of the embodiment of the present invention, in step S120, the position and the range of the steel pipe to be repainted are marked when the steel pipe is inspected.
As a further limitation of the technical solution of the embodiment of the present invention, the performing of the appearance inspection on the steel pipe in step S100 further includes the following specific steps: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
As a further limitation of the technical scheme of the embodiment of the invention, the thickness of the primer coating is more than or equal to 250 μm, and the thickness of the finish coating is more than or equal to 200 μm.
As a further limitation of the technical solution of the embodiment of the present invention, in step S400, the curing time of the primer is not less than 2 h.
As a further limitation of the technical scheme of the embodiment of the invention, the raw materials for preparing the epoxy coating for forming the epoxy coating comprise a component a and a component B, wherein the component a comprises novolac epoxy resin, organic silicon resin, partially reduced graphene oxide, pigment, filler, organic solvent and an auxiliary agent, and the component B is a curing agent.
As a further limitation of the technical solution of the embodiment of the present invention, the preparation method of the epoxy coating includes: and uniformly mixing the component A and the component B to obtain the epoxy coating.
As a further limitation of the technical scheme of the embodiment of the invention, the auxiliary agent is a mixture of a dispersing auxiliary agent, a coupling agent, an adhesion auxiliary agent, a defoaming agent and a leveling agent.
As a further limitation of the technical solution of the embodiment of the present invention, the curing agent is one or a mixture of two of alicyclic modified amine and polyether amine in any proportion.
Compared with the prior art, the steel pipeline epoxy coating on-site coating method provided by the embodiment of the invention can conveniently carry out on-site coating of the epoxy coating on the surface of the steel pipeline, has better coating surface tiling performance, higher coating structure uniformity, lower coating residual stress and higher coating hardness, improves the effect of surface processing treatment on the steel pipeline, and has very high application value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a flowchart of a method for on-site recoating an epoxy coating on a steel pipe according to an embodiment of the present invention.
Fig. 2 is a flowchart of an appearance inspection in the method for on-site repair coating of an epoxy coating layer on a steel pipe according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1, in an embodiment of the present invention, a method for repairing an epoxy coating on a steel pipe in situ includes the following steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
Example 2
Referring to fig. 1-2, in an embodiment of the present invention, a method for in-situ coating an epoxy coating on a steel pipe includes the following steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
Further, in the embodiment provided by the present invention, the step S100 of performing the appearance inspection on the steel pipe includes the following specific steps: s110: placing the steel pipeline on a detection platform; s120: and inspecting the surface of the steel pipeline placed on the detection platform.
In addition, in the embodiment of the present invention, in step S120, the position and the range where paint repair is required are marked when the steel pipe is inspected.
Further, in the embodiment of the present invention, the step S100 of performing the appearance inspection on the steel pipe further includes the following specific steps: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
Example 3
Referring to fig. 1-2, in an embodiment of the present invention, a method for in-situ coating an epoxy coating on a steel pipe includes the following steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
Further, in the embodiment provided by the present invention, the step S100 of performing the appearance inspection on the steel pipe includes the following specific steps: s110: placing the steel pipeline on a detection platform; s120: and inspecting the surface of the steel pipeline placed on the detection platform.
In addition, in the embodiment of the present invention, in step S120, the position and the range where paint repair is required are marked when the steel pipe is inspected.
Further, in the embodiment of the present invention, the step S100 of performing the appearance inspection on the steel pipe further includes the following specific steps: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
Preferably, in the embodiment provided by the invention, the thickness of the primer coating is more than or equal to 250 μm, and the thickness of the finish coating is more than or equal to 200 μm. In addition, in the present embodiment, in step S400, the primer curing time is not less than 2 hours.
Example 4
Referring to fig. 1-2, in an embodiment of the present invention, a method for in-situ coating an epoxy coating on a steel pipe includes the following steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
Further, in the embodiment provided by the present invention, the step S100 of performing the appearance inspection on the steel pipe includes the following specific steps: s110: placing the steel pipeline on a detection platform; s120: and inspecting the surface of the steel pipeline placed on the detection platform.
In addition, in the embodiment of the present invention, in step S120, the position and the range where paint repair is required are marked when the steel pipe is inspected.
Further, in the embodiment of the present invention, the step S100 of performing the appearance inspection on the steel pipe further includes the following specific steps: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
Preferably, in the embodiment provided by the invention, the thickness of the primer coating is more than or equal to 250 μm, and the thickness of the finish coating is more than or equal to 200 μm. In addition, in the present embodiment, in step S400, the primer curing time is not less than 2 hours.
The preparation raw materials of the epoxy coating for forming the epoxy coating comprise a component A and a component B, wherein the component A comprises novolac epoxy resin, organic silicon resin, partially reduced graphene oxide, pigment and filler, an organic solvent and an auxiliary agent, and the component B is a curing agent.
Further, in an embodiment of the present invention, a method for preparing the epoxy coating includes: and uniformly mixing the component A and the component B to obtain the epoxy coating.
Example 5
Referring to fig. 1-2, in an embodiment of the present invention, a method for in-situ coating an epoxy coating on a steel pipe includes the following steps: s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating; s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated; s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine; s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating; s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
Further, in the embodiment provided by the present invention, the step S100 of performing the appearance inspection on the steel pipe includes the following specific steps: s110: placing the steel pipeline on a detection platform; s120: and inspecting the surface of the steel pipeline placed on the detection platform.
In addition, in the embodiment of the present invention, in step S120, the position and the range where paint repair is required are marked when the steel pipe is inspected.
Further, in the embodiment of the present invention, the step S100 of performing the appearance inspection on the steel pipe further includes the following specific steps: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
Preferably, in the embodiment provided by the invention, the thickness of the primer coating is more than or equal to 250 μm, and the thickness of the finish coating is more than or equal to 200 μm. In addition, in the present embodiment, in step S400, the primer curing time is not less than 2 hours.
The preparation raw materials of the epoxy coating for forming the epoxy coating comprise a component A and a component B, wherein the component A comprises novolac epoxy resin, organic silicon resin, partially reduced graphene oxide, pigment and filler, an organic solvent and an auxiliary agent, and the component B is a curing agent.
Further, in an embodiment of the present invention, a method for preparing the epoxy coating includes: and uniformly mixing the component A and the component B to obtain the epoxy coating.
The auxiliary agent is a mixture of a dispersing auxiliary agent, a coupling agent, an adhesion auxiliary agent, a defoaming agent and a flatting agent.
The curing agent is one or a mixture of two of alicyclic modified amine and polyether amine in any proportion.
In conclusion, in the steel pipeline epoxy coating on-site repair coating method provided by the embodiment of the invention, the steel pipeline surface can be conveniently subjected to on-site epoxy coating distribution and repair coating, the coating surface has better tiling performance, the coating structure has higher uniformity, the coating residual stress is lower, the coating hardness is higher, the steel pipeline surface processing effect is improved, and the steel pipeline epoxy coating on-site repair coating method has high application value.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An on-site recoating method of an epoxy coating of a steel pipeline is characterized by comprising the following specific steps:
s100: carrying out appearance inspection on the steel pipeline, and determining the position of the surface of the steel pipeline, which needs to be subjected to coating;
s200: cleaning an oxide layer on the surface of the position of the steel pipeline where the epoxy coating needs to be additionally coated;
s300: polishing the surface of the steel pipeline needing to be coated with the epoxy coating by using a polishing machine;
s400: repairing the surface of a damaged point of the epoxy coating by using a quick-drying double-component solvent-free epoxy coating, taking the quick-drying double-component solvent-free epoxy coating as a primer, fully stirring and curing the primer for later use, quickly repairing the damaged epoxy coating, and after the primer is cured, blade-coating a finish coating of toughened modified resin on the surface of the primer coating to form a flexible modified finish coating;
s500: and (5) carrying out process inspection on the steel pipeline subjected to the coating repairing, and storing the pipeline qualified in inspection.
2. The method for on-site refinishing of an epoxy coating on a steel pipe according to claim 1, wherein the step S100 of performing an appearance inspection on the steel pipe comprises the following specific steps:
s110: placing the steel pipeline on a detection platform;
s120: and inspecting the surface of the steel pipeline placed on the detection platform.
3. The method of claim 2, wherein the steel pipe is inspected to mark the location and extent of the steel pipe to be repainted in step S120.
4. The method for on-site refinishing of an epoxy coating on a steel pipe according to claim 3, wherein the step of performing an appearance inspection on the steel pipe in step S100 further comprises the specific steps of: and (3) checking whether the inner wall surface and the outer wall surface of the pipeline contain grease or oil stain marks, and removing the grease or oil stain marks by using a high-volatility grease stain cleaning agent.
5. The method for in-situ refinish of an epoxy coating on a steel pipe according to any of claims 1 to 4, wherein the thickness of the primer coating is 250 μm or more and the thickness of the topcoat coating is 200 μm or more.
6. The method for in situ refinish of an epoxy coating on a steel pipe according to claim 5, wherein in step S400, the primer is cured for not less than 2 hours.
7. The on-site refinishing method for the epoxy coating of the steel pipeline according to any one of claims 1 to 4, wherein the epoxy coating for forming the epoxy coating is prepared from raw materials comprising a component A and a component B, wherein the component A comprises novolac epoxy resin, organic silicon resin, partially reduced graphene oxide, pigments and fillers, organic solvent and auxiliaries, and the component B is a curing agent.
8. The method of claim 7, wherein the epoxy coating is prepared by a process comprising: and uniformly mixing the component A and the component B to obtain the epoxy coating.
9. The steel pipeline epoxy coating in-situ make-up coating method of claim 8, wherein the additive is a mixture of a dispersing additive, a coupling agent, an adhesion additive, a defoaming agent and a leveling agent.
10. The method for in-situ refinishing of an epoxy coating on a steel pipe according to claim 9, wherein the curing agent is one or a mixture of two of alicyclic modified amine and polyether amine in any ratio.
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| CN116060277A (en) * | 2022-12-19 | 2023-05-05 | 中国铁建港航局集团有限公司 | Improved process for repairing coating of 3LPE pipeline |
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