CN112760001A - Sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields and construction method - Google Patents
Sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields and construction method Download PDFInfo
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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
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
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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
- B05D7/22—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
- B05D7/227—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 containers, cans or the like
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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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
-
- 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
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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
- 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
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a sulfur-resistant inner coating anticorrosion structure for medium and large containers for oil and gas fields, which comprises a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein the bottom air spraying layer is phosphate composite epoxy resin paint, and the surface air spraying layer is titanium-graphene high-molecular composite modified epoxy resin paint. The invention has the advantages that: the metal substrate water sand blasting treatment layer aims at improving the adhesive force of the coating and removing an original coating, a rust layer and a dirt layer attached to the substrate layer, the bottom air spraying layer adopts phosphate ester composite epoxy resin paint, phosphate ester groups react with the tank wall to passivate the tank wall, and the surface air spraying layer adopts titanium-graphene high-molecular composite modified epoxy resin paint, so that the high-efficiency isolation and corrosion prevention effects on corrosive media such as sulfide, oxidant and the like in fluid are achieved, the corrosion prevention effect is good, and the service life of equipment and facilities is effectively prolonged; and an automatic spraying device is adopted for spraying, so that the production efficiency is improved, and the safety is ensured.
Description
Technical Field
The invention relates to a sulfur-resistant inner coating anticorrosion structure for medium and large containers for oil and gas fields and a construction method, and belongs to the technical field of anticorrosion structures.
Background
The oil and gas field container is a large container used for storing oil products and has a regular shape, and can be divided into a metal oil tank and a nonmetal oil tank according to different construction materials. At present, the metal oil tank is mainly adopted, in order to guarantee the service life, the inner wall needs to be subjected to anticorrosion treatment, and for anticorrosion construction operation in large and medium storage tanks, most of the metal oil tank adopts a large tank inside scaffold, and manual operation is adopted to complete the construction operations of derusting, paint spraying and the like of the inner wall of the large tank. The construction operation like this, because of ventilation is bad in big jar, there is a large amount of dust, has toxic substance etc. and the construction environment is very abominable, neither does not benefit to workman's healthy, also does not benefit to the safety in production to anticorrosive quality is very poor, and production efficiency is low, can not satisfy jar interior anticorrosive engineering's needs far away.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sulfur-resistant inner coating anti-corrosion structure for medium and large containers for oil and gas fields and a construction method thereof.
The invention is realized by the following scheme: the utility model provides a medium-and-large-sized container sulfur-resistant inner coating anticorrosion structure for oil gas field, it includes metal substrate water sand blasting processing layer, bottom air spraying layer and surface air spraying layer, bottom air spraying layer is phosphate ester composite epoxy resin coating, and it is made by liquid polysulfide rubber, phosphate ester group epoxy resin, adhesion promotion resin, carbon black, fumed silica, isoamyl acetate, modified alicyclic amine epoxy hardener, surface air spraying layer is titanium-graphite alkene polymer composite modified epoxy resin coating, and it is made by modified phenol formaldehyde epoxy resin, nanometer titanium dioxide, graphite alkene-graphene oxide, isoamyl acetate, dispersant, flatting agent, modified alicyclic amine epoxy hardener.
When the metal substrate is treated by water sand blasting, the water quality requires that COD is less than or equal to 80ppm, BOD is less than or equal to 10ppm, CL is less than or equal to 250ppm, PH is 6-9, hydraulic pressure is 0.6-1.2mpa, water flow is 9-11L/min, and a corrosion inhibitor or an anti-flash rust agent is added into water for 0.1-0.5 percent; the treatment level is more than or equal to Sa2.5.
The bottom air spraying layer comprises the following components in percentage by weight: 3-4 parts of liquid polysulfide rubber, 72-74 parts of phosphate group epoxy resin, 4-5 parts of adhesion promoting resin, 0.1-0.15 part of carbon black, 1-1.5 parts of fumed silica, 1-2 parts of isoamyl acetate and 13-15 parts of modified alicyclic amine epoxy curing agent, wherein the air spraying layer of the surface layer comprises the following components in percentage by weight: 72-74 parts of modified phenolic epoxy resin, 2-3 parts of nano titanium dioxide, 1.5-2 parts of graphene-graphene oxide, 1-2 parts of isoamyl acetate, 1-2 parts of dispersing agent, 1-2 parts of flatting agent and 13-25 parts of modified alicyclic amine epoxy curing agent.
The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large containers for the oil and gas fields comprises the steps that the inner walls of the containers are sprayed through spraying equipment, the spraying equipment comprises a spraying device, an upper sliding device, a middle sliding device and a lower sliding device, the upper sliding device is movably clamped on the upper walls of the containers, the lower sliding device is placed on the bottom walls of the containers, sliding rails are connected between the upper sliding device and the lower sliding device, the middle sliding device is arranged on the sliding rails, one side of the middle sliding device is connected to the spraying device through a connecting rod, and the other side of the middle sliding device is connected to a coating box through a connecting rod.
The spraying means faces the inner wall of the container.
The slide rail is vertical structure, and its upper end is connected perpendicularly and is gone up the horizontal pole, it is connected perpendicularly to go up the horizontal pole go up slider, the lower extreme of slide rail is connected perpendicularly the sheer pole, the sheer pole is connected perpendicularly to lower slider.
The lower end of the upper sliding device is provided with a clamping groove with a downward opening, the upper sliding device is clamped on the upper wall of the container through the clamping groove, and the upper sliding device slides along the upper wall of the container.
The lower sliding device slides on the bottom wall of the container, the upper sliding device and the lower sliding device slide synchronously, and the middle sliding device slides up and down along the sliding rail.
The spraying coating device is an automatic spraying device, and a spray gun is always vertical to the inner wall of the container in the automatic spraying device.
A construction method of a sulfur-resistant inner coating anti-corrosion structure of a medium-sized and large-sized container for an oil and gas field comprises the following steps,
step one, carrying out water sand blasting to achieve the purpose of removing rust on the inner surface;
step two, uniformly spraying a bottom air spraying layer, and then drying;
and step three, uniformly spraying the first surface layer air spraying layer, and spraying the second surface layer air spraying layer after 30 min.
The invention has the beneficial effects that:
1. the sulfur-resistant inner coating anti-corrosion structure for the medium and large containers for the oil and gas fields and the construction method comprise a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein rust on the wall of the metal substrate water sand blasting treatment layer is removed, the bottom air spraying layer adopts phosphate composite epoxy resin paint, phosphate groups react with the wall of the tank to passivate the wall of the tank, and the surface air spraying layer adopts titanium-graphene high-molecular composite modified epoxy resin paint to play a role in efficient isolation and corrosion resistance;
2. the automatic spraying device is adopted for spraying, so that the production efficiency is greatly improved, the construction safety is ensured, and the air pollution and the personnel injury are reduced;
3. the automatic spraying device in the automatic spraying device is adopted, so that the spray gun is always vertical to a spraying surface, the device is fixed in the storage tank, the spray gun can be automatically driven to rotate, the height is automatically adjusted, the full-automatic spraying is realized, and unmanned operators can enter the device for operation.
Drawings
Fig. 1 is a schematic front view of the spraying device of the present invention.
In the figure: the spraying device is 1, the upper sliding device is 2, the middle sliding device is 3, the lower sliding device is 4, the container is 5, the sliding rail is 6, the connecting rod is 7, the coating box is 8, the upper cross rod is 9, the lower cross rod is 10, and the clamping groove is 11.
Detailed Description
The invention is further described below with reference to fig. 1, without limiting the scope of the invention.
In which like parts are designated by like reference numerals. It is noted that the terms "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component, and the drawings are in greatly simplified form and employ non-precise ratios, merely for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development effort might be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
Example 1: a sulfur-resistant inner coating anticorrosion structure for medium and large containers for oil and gas fields comprises a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein the bottom air spraying layer is a phosphate ester composite epoxy resin coating which is prepared from liquid polysulfide rubber, phosphate ester group epoxy resin, adhesion promoting resin, carbon black, fumed silica, isoamyl acetate and a modified alicyclic amine epoxy curing agent, the surface air spraying layer is a titanium-graphene high-molecular composite modified epoxy resin coating which is prepared from modified phenolic epoxy resin, nano titanium dioxide, graphene-graphene oxide, isoamyl acetate, a dispersing agent, a flatting agent and a modified alicyclic amine epoxy curing agent, the metal substrate water sand blasting treatment aims at improving the adhesion of the coating and removing an original coating, a rust layer and a dirt layer which are adhered to a substrate layer, the bottom air spraying layer is made of phosphate ester composite epoxy resin coating, phosphate ester groups react with the tank wall to passivate the tank wall, the surface air spraying layer is made of titanium-graphene polymer composite modified epoxy resin coating, the efficient isolation and corrosion prevention effects on corrosive media such as sulfide and oxidant in fluid are achieved, the whole corrosion prevention structure is good in corrosion prevention effect, and the service life of equipment and facilities can be effectively prolonged.
When the metal substrate is treated by water sand blasting, the water quality requires that COD is 80ppm, BOD is 10ppm, CL is 250ppm, PH is 6, hydraulic pressure is 0.6mpa, water flow is 9L/min, and a corrosion inhibitor or an anti-flash rust agent is added into water by 0.1 percent; the treatment level was Sa2.5.
The bottom air spraying layer comprises the following components in percentage by weight: the coating comprises liquid polysulfide rubber 3, phosphate group epoxy resin 72, adhesion promoting resin 4, carbon black 0.1, fumed silica 1, isoamyl acetate 1, modified alicyclic amine epoxy curing agent 13, and a surface layer air spraying layer, wherein the weight percentages of the components are as follows: modified novolac epoxy resin 72, nano titanium dioxide 2, graphene-graphene oxide 1.5, isoamyl acetate 1, dispersant 1, leveling agent 1 and modified alicyclic amine epoxy curing agent 13.
A construction method of a sulfur-resistant inner coating anticorrosion structure of a medium-sized and large-sized container for an oil and gas field is characterized in that the inner wall of a container 5 is sprayed through spraying equipment, the spraying equipment comprises a spraying device 1, an upper sliding device 2, a middle sliding device 3 and a lower sliding device 4, the upper sliding device 2 is movably clamped on the upper wall of the container 5, the lower sliding device 4 is placed on the bottom wall of the container 5, a sliding rail 6 is connected between the upper sliding device 2 and the lower sliding device 4, the middle sliding device 3 is arranged on the sliding rail 6, one side of the middle sliding device 3 is connected to the spraying device 1 through a connecting rod 7, and the other side of the middle sliding device 3 is connected to a coating box 8.
The spraying device 1 faces the inner wall of the container 5, the sliding rail 6 is of a vertical structure, the upper end of the sliding rail is vertically connected with an upper cross rod 9, the upper cross rod 9 is vertically connected with an upper sliding device 2, the lower end of the sliding rail is vertically connected with a lower cross rod 10, the lower cross rod 10 is vertically connected with a lower sliding device 4, the lower end of the upper sliding device 2 is provided with a clamping groove 11 with a downward opening, the upper sliding device 2 is clamped on the upper wall of the container 5 through the clamping groove 11, the upper sliding device 2 slides along the upper wall of the container 5, the lower sliding device 4 slides on the bottom wall of the container 5, the upper sliding device 2 and the lower sliding device 4 synchronously slide, the middle sliding device 3 slides up and down along the sliding rail 6, and how the upper sliding device 2, the middle sliding device 3 and the lower sliding device 4 slide is known in the prior art, the internal structure, the working principle, the interior of which is such that the lance is always perpendicular to the inner wall of the vessel 5.
A construction method of a sulfur-resistant inner coating anti-corrosion structure of a medium-sized and large-sized container for an oil and gas field comprises the following steps,
step one, carrying out water sand blasting to achieve the purpose of removing rust on the inner surface;
step two, uniformly spraying a bottom air spraying layer, and then drying;
and step three, uniformly spraying the first surface layer air spraying layer, and spraying the second surface layer air spraying layer after 30 min.
Example 2: a sulfur-resistant inner coating anticorrosion structure for medium and large containers for oil and gas fields comprises a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein the bottom air spraying layer is a phosphate ester composite epoxy resin coating which is prepared from liquid polysulfide rubber, phosphate ester group epoxy resin, adhesion promoting resin, carbon black, fumed silica, isoamyl acetate and a modified alicyclic amine epoxy curing agent, the surface air spraying layer is a titanium-graphene high-molecular composite modified epoxy resin coating which is prepared from modified phenolic epoxy resin, nano titanium dioxide, graphene-graphene oxide, isoamyl acetate, a dispersing agent, a flatting agent and a modified alicyclic amine epoxy curing agent, the metal substrate water sand blasting treatment aims at improving the adhesion of the coating and removing an original coating, a rust layer and a dirt layer which are adhered to a substrate layer, the bottom air spraying layer is made of phosphate ester composite epoxy resin coating, phosphate ester groups react with the tank wall to passivate the tank wall, the surface air spraying layer is made of titanium-graphene polymer composite modified epoxy resin coating, the efficient isolation and corrosion prevention effects on corrosive media such as sulfide and oxidant in fluid are achieved, the whole corrosion prevention structure is good in corrosion prevention effect, and the service life of equipment and facilities can be effectively prolonged.
When the metal substrate is treated by water sand blasting, the water quality requires 70ppm of COD, 8ppm of BOD, 200ppm of CL, 9 of PH, 1.2mpa of hydraulic pressure and 11L/min of water flow, and 0.5% of corrosion inhibitor or anti-flash rust agent is added into the water; the processing level is Sa 3.
The bottom air spraying layer comprises the following components in percentage by weight: the coating comprises liquid polysulfide rubber 4, phosphate group epoxy resin 74, adhesion promoting resin 5, carbon black 0.15, fumed silica 1.5, isoamyl acetate 2, modified alicyclic amine epoxy curing agent 15, and a surface layer air spraying layer, wherein the weight percentages of the components are as follows: the modified phenolic epoxy resin comprises 74 modified phenolic epoxy resin, 3 nano titanium dioxide, 2 graphene-graphene oxide, 2 isoamyl acetate, 2 a dispersing agent, 2 a flatting agent and 25 a modified alicyclic amine epoxy curing agent.
A construction method of a sulfur-resistant inner coating anticorrosion structure of a medium-sized and large-sized container for an oil and gas field is characterized in that the inner wall of a container 5 is sprayed through spraying equipment, the spraying equipment comprises a spraying device 1, an upper sliding device 2, a middle sliding device 3 and a lower sliding device 4, the upper sliding device 2 is movably clamped on the upper wall of the container 5, the lower sliding device 4 is placed on the bottom wall of the container 5, a sliding rail 6 is connected between the upper sliding device 2 and the lower sliding device 4, the middle sliding device 3 is arranged on the sliding rail 6, one side of the middle sliding device 3 is connected to the spraying device 1 through a connecting rod 7, and the other side of the middle sliding device 3 is connected to a coating box 8.
The spraying device 1 faces the inner wall of the container 5, the sliding rail 6 is of a vertical structure, the upper end of the sliding rail is vertically connected with an upper cross rod 9, the upper cross rod 9 is vertically connected with an upper sliding device 2, the lower end of the sliding rail is vertically connected with a lower cross rod 10, the lower cross rod 10 is vertically connected with a lower sliding device 4, the lower end of the upper sliding device 2 is provided with a clamping groove 11 with a downward opening, the upper sliding device 2 is clamped on the upper wall of the container 5 through the clamping groove 11, the upper sliding device 2 slides along the upper wall of the container 5, the lower sliding device 4 slides on the bottom wall of the container 5, the upper sliding device 2 and the lower sliding device 4 synchronously slide, the middle sliding device 3 slides up and down along the sliding rail 6, and how the upper sliding device 2, the middle sliding device 3 and the lower sliding device 4 slide is known in the prior art, the internal structure, the working principle, the interior of which is such that the lance is always perpendicular to the inner wall of the vessel 5.
A construction method of a sulfur-resistant inner coating anti-corrosion structure of a medium-sized and large-sized container for an oil and gas field comprises the following steps,
step one, carrying out water sand blasting to achieve the purpose of removing rust on the inner surface;
step two, uniformly spraying a bottom air spraying layer, and then drying;
and step three, uniformly spraying the first surface layer air spraying layer, and spraying the second surface layer air spraying layer after 30 min.
Example 3: a sulfur-resistant inner coating anticorrosion structure for medium and large containers for oil and gas fields comprises a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein the bottom air spraying layer is a phosphate ester composite epoxy resin coating which is prepared from liquid polysulfide rubber, phosphate ester group epoxy resin, adhesion promoting resin, carbon black, fumed silica, isoamyl acetate and a modified alicyclic amine epoxy curing agent, the surface air spraying layer is a titanium-graphene high-molecular composite modified epoxy resin coating which is prepared from modified phenolic epoxy resin, nano titanium dioxide, graphene-graphene oxide, isoamyl acetate, a dispersing agent, a flatting agent and a modified alicyclic amine epoxy curing agent, the metal substrate water sand blasting treatment aims at improving the adhesion of the coating and removing an original coating, a rust layer and a dirt layer which are adhered to a substrate layer, the bottom air spraying layer is made of phosphate ester composite epoxy resin coating, phosphate ester groups react with the tank wall to passivate the tank wall, the surface air spraying layer is made of titanium-graphene polymer composite modified epoxy resin coating, the efficient isolation and corrosion prevention effects on corrosive media such as sulfide and oxidant in fluid are achieved, the whole corrosion prevention structure is good in corrosion prevention effect, and the service life of equipment and facilities can be effectively prolonged.
When the metal substrate is treated by water sand blasting, the water quality requires 60ppm of COD, 5ppm of BOD, 150ppm of CL, 8 of PH, 0.9mpa of hydraulic pressure and 10L/min of water flow, and 0.3% of corrosion inhibitor or anti-flash rust agent is added into the water; the processing level is Sa 4.
The bottom air spraying layer comprises the following components in percentage by weight: 3-4 parts of liquid polysulfide rubber, 73 parts of phosphate ester group epoxy resin, 4.5 parts of adhesion promoting resin, 0.12 part of carbon black, 1.3 parts of fumed silica, 1.5 parts of isoamyl acetate, 14 parts of modified alicyclic amine epoxy curing agent, and the air spraying layer of the surface layer comprises the following components in percentage by weight: 73 parts of modified novolac epoxy resin, 2.5 parts of nano titanium dioxide, 1.8 parts of graphene-graphene oxide, 1.5 parts of isoamyl acetate, 1.5 parts of a dispersing agent, 1.5 parts of a flatting agent and 20 parts of a modified alicyclic amine epoxy curing agent.
A construction method of a sulfur-resistant inner coating anticorrosion structure of a medium-sized and large-sized container for an oil and gas field is characterized in that the inner wall of a container 5 is sprayed through spraying equipment, the spraying equipment comprises a spraying device 1, an upper sliding device 2, a middle sliding device 3 and a lower sliding device 4, the upper sliding device 2 is movably clamped on the upper wall of the container 5, the lower sliding device 4 is placed on the bottom wall of the container 5, a sliding rail 6 is connected between the upper sliding device 2 and the lower sliding device 4, the middle sliding device 3 is arranged on the sliding rail 6, one side of the middle sliding device 3 is connected to the spraying device 1 through a connecting rod 7, and the other side of the middle sliding device 3 is connected to a coating box 8.
The spraying device 1 faces the inner wall of the container 5, the sliding rail 6 is of a vertical structure, the upper end of the sliding rail is vertically connected with an upper cross rod 9, the upper cross rod 9 is vertically connected with an upper sliding device 2, the lower end of the sliding rail is vertically connected with a lower cross rod 10, the lower cross rod 10 is vertically connected with a lower sliding device 4, the lower end of the upper sliding device 2 is provided with a clamping groove 11 with a downward opening, the upper sliding device 2 is clamped on the upper wall of the container 5 through the clamping groove 11, the upper sliding device 2 slides along the upper wall of the container 5, the lower sliding device 4 slides on the bottom wall of the container 5, the upper sliding device 2 and the lower sliding device 4 synchronously slide, the middle sliding device 3 slides up and down along the sliding rail 6, and how the upper sliding device 2, the middle sliding device 3 and the lower sliding device 4 slide is known in the prior art, the internal structure, the working principle, the interior of which is such that the lance is always perpendicular to the inner wall of the vessel 5.
A construction method of a sulfur-resistant inner coating anti-corrosion structure of a medium-sized and large-sized container for an oil and gas field comprises the following steps,
step one, carrying out water sand blasting to achieve the purpose of removing rust on the inner surface;
step two, uniformly spraying a bottom air spraying layer, and then drying;
and step three, uniformly spraying the first surface layer air spraying layer, and spraying the second surface layer air spraying layer after 30 min.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (10)
1. The utility model provides an oil gas field is with anti sulphur undercoating anticorrosion structure in large-scale container which characterized in that: the coating comprises a metal substrate water sand blasting treatment layer, a bottom air spraying layer and a surface air spraying layer, wherein the bottom air spraying layer is a phosphate ester composite epoxy resin coating which is prepared from liquid polysulfide rubber, phosphate ester group epoxy resin, adhesion promoting resin, carbon black, fumed silica, isoamyl acetate and a modified alicyclic amine epoxy curing agent, and the surface air spraying layer is a titanium-graphene high-molecular composite modified epoxy resin coating which is prepared from modified phenolic epoxy resin, nano titanium dioxide, graphene-graphene oxide, isoamyl acetate, a dispersing agent, a leveling agent and a modified alicyclic amine epoxy curing agent.
2. The sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields according to claim 1, wherein: when the metal substrate is treated by water sand blasting, the water quality requires that COD is less than or equal to 80ppm, BOD is less than or equal to 10ppm, CL is less than or equal to 250ppm, PH is 6-9, hydraulic pressure is 0.6-1.2mpa, water flow is 9-11L/min, and a corrosion inhibitor or an anti-flash rust agent is added into water for 0.1-0.5 percent; the treatment level is more than or equal to Sa2.5.
3. The sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields of claim 1: the bottom air spraying layer comprises the following components in percentage by weight: 3-4 parts of liquid polysulfide rubber, 72-74 parts of phosphate group epoxy resin, 4-5 parts of adhesion promoting resin, 0.1-0.15 part of carbon black, 1-1.5 parts of fumed silica, 1-2 parts of isoamyl acetate and 13-15 parts of modified alicyclic amine epoxy curing agent, wherein the air spraying layer of the surface layer comprises the following components in percentage by weight: 72-74 parts of modified phenolic epoxy resin, 2-3 parts of nano titanium dioxide, 1.5-2 parts of graphene-graphene oxide, 1-2 parts of isoamyl acetate, 1-2 parts of dispersing agent, 1-2 parts of flatting agent and 13-25 parts of modified alicyclic amine epoxy curing agent.
4. A construction method of a sulfur-resistant inner coating corrosion-resistant structure of medium and large containers for oil and gas fields is characterized in that: it sprays the inner wall of container (5) through spraying equipment, spraying equipment includes spraying device (1), last slider (2), well slider (3) and slider (4) down, it blocks on the upper wall of container (5) to go up slider (2) activity, slider (4) are placed down on the diapire of container (5), go up slider (2) with connect slide rail (6) down between slider (4), well slider (3) set up on slide rail (6), one side of well slider (3) is connected to through connecting rod (7) spraying device (1), and the opposite side is connected to paint bin (8) through connecting rod (7).
5. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: the spraying device (1) faces the inner wall of the container (5).
6. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: the sliding rail (6) is of a vertical structure, the upper end of the sliding rail is vertically connected with an upper cross rod (9), the upper cross rod (9) is vertically connected to the upper sliding device (2), the lower end of the sliding rail is vertically connected with a lower cross rod (10), and the lower cross rod (10) is vertically connected to the lower sliding device (4).
7. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: the lower end of the upper sliding device (2) is provided with a clamping groove (11) with a downward opening, the upper sliding device (2) is clamped on the upper wall of the container (5) through the clamping groove (11), and the upper sliding device (2) slides along the upper wall of the container (5).
8. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: the lower sliding device (4) slides on the bottom wall of the container (5), the upper sliding device (2) and the lower sliding device (4) slide synchronously, and the middle sliding device (3) slides up and down along the sliding rail (6).
9. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: the spraying device (1) is an automatic spraying device, and a spray gun is always vertical to the inner wall of the container (5) in the spraying device.
10. The construction method of the sulfur-resistant inner coating anti-corrosion structure of the medium and large container for the oil and gas field as claimed in claim 4, characterized in that: which is carried out according to the following steps,
step one, carrying out water sand blasting to achieve the purpose of an original coating, a rust layer and a dirt layer attached to a substrate layer;
step two, uniformly spraying a bottom air spraying layer, and then naturally drying;
and step three, uniformly spraying the first surface layer air spraying layer, spraying the second surface layer air spraying layer after 30min, and then naturally drying.
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| CN202011511864.1A CN112760001A (en) | 2020-12-18 | 2020-12-18 | Sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields and construction method |
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Application publication date: 20210507 |