CN110252631B - Anticorrosive spraying method for inner wall of chemical storage tank - Google Patents
Anticorrosive spraying method for inner wall of chemical storage tank Download PDFInfo
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- CN110252631B CN110252631B CN201910626331.9A CN201910626331A CN110252631B CN 110252631 B CN110252631 B CN 110252631B CN 201910626331 A CN201910626331 A CN 201910626331A CN 110252631 B CN110252631 B CN 110252631B
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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
- B05D3/10—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 other chemical 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
- 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
- B05D7/22—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
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- 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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- 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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- 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
- C09D163/10—Epoxy resins modified by unsaturated compounds
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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
- C09D5/002—Priming 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
- C09D5/08—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
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- 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
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
- C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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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
- B05D2320/00—Organic additives
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D2504/00—Epoxy polymers
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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
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Abstract
The invention provides an anticorrosive spraying method for the inner wall of a chemical storage tank, which comprises the following steps: 1) carrying out surface sand blasting treatment on the inner wall of the tank body, and carrying out phosphating passivation treatment on the tank body after sand blasting; 2) spraying metal powder on the surface of the tank body subjected to sand blasting and phosphating passivation, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer; 3) spraying a primer layer on the surface of the metal powder bottom layer; 4) spraying a middle paint layer on the surface of the primer layer; 5) and spraying finish paint on the surface of the intermediate paint layer. The treatment process for phosphating and passivating the surface of the inner wall of the tank body and spraying the metal powder coating is added after the sand blasting treatment, the acid washing step after the traditional sand blasting process is avoided through the phosphating and passivating treatment, the tiny sharp corners on the surface after the sand blasting treatment are reduced, the continuity of the basic anticorrosive coating is ensured, and the metal powder coating has high mechanical strength, strong adhesive force, good corrosion resistance and aging resistance, can effectively conduct static electricity generated by the flowing of petrochemical media, and can also play a role in electrochemical protection.
Description
Technical Field
The invention belongs to the technical field of tank body anticorrosion spraying processes, and particularly relates to an anticorrosion spraying method for an inner wall of a chemical storage tank.
Background
The chemical storage tank is used for transporting or storing chemical products, has higher requirements on the performances of acid resistance, alkali resistance, corrosion resistance, static electricity resistance and the like, otherwise, the corrosion is accelerated to reduce the strength and shorten the service life, and even the accidents of leakage or tank collapse and the like can be caused, so that the corrosion factors of the chemical storage tank are required to be comprehensively analyzed, and from the tank construction, the anticorrosive paint is preferentially selected, a new process is adopted, and the anticorrosive construction management is enhanced.
The existing chemical storage tank is coated with a layer of zinc-rich or epoxy primer and finish paint on the inner wall according to the conventional construction process, so that the corrosion resistance is often poor; and for some flammable dangerous chemicals and occasions needing static elimination, or environments with strong chemical corrosion such as acid media with more sulfur, salt media with more chloride ions, media with strong alkali, and the like, and areas (oil-water interfaces) with frequently changed liquid level of the inner wall (oil-gas interfaces) and areas (oil-water interfaces) about 1.5 meters above the bottom, the existing anticorrosive coating process has poor applicability to anticorrosive effect.
Disclosure of Invention
The invention aims to solve the problem of poor anticorrosion effect of the anticorrosion coating process of the existing chemical storage tank.
Therefore, the invention provides an anticorrosive spraying method for the inner wall of a chemical storage tank, which comprises the following steps:
1) carrying out surface sand blasting treatment on the inner wall of the tank body in an airless sand blasting manner, and carrying out phosphating passivation treatment on the inner wall surface of the tank body after sand blasting to form a stable phosphating film on the surface;
2) spraying metal powder on the surface of the tank body subjected to sand blasting and phosphating passivation treatment in the step 1), and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer;
3) spraying a primer layer on the surface of the metal powder bottom layer in the step 2) in an airless spraying manner;
4) spraying a middle paint layer on the surface of the primer layer in the step 3) in a high-pressure airless spraying mode;
5) and 4) spraying finish paint on the surface of the intermediate paint layer in the step 4) in an airless spraying mode.
Further, the parameters of the sand blasting process in the step 1) are as follows: adopting 150-180 mesh carborundum, wherein the sand blasting pressure is 2.5MPa, the sand blasting distance is 15-20 cm, the sand blasting angle between the carborundum and the inner wall surface of the tank body is 35-45 degrees, and the sand blasting quality requirement reaches Sa2.5 grade.
Further, the phosphating and passivating treatment process in the step 1) comprises the following steps:
a. sealing other outlets except the air inlet and the air outlet on the tank body;
b. reacting NaH with2PO4、NaNO2And water in a weight ratio of 1-2.5: 3-4: 12-25, mixing, preparing an antiseptic treatment agent, and heating the antiseptic treatment agent to a water vapor state through steam;
c. adding the anti-corrosion treatment agent in a water vapor state from an air inlet of the tank body by using a wind conveying device, and connecting an air outlet of the tank body back into the anti-corrosion treatment agent storage tank through a pipeline, wherein the initial temperature of the outer wall of the tank body is 5-38 ℃, and the maintenance time of the anti-corrosion treatment agent in the water vapor state in the tank body is 10-12 hours;
d. the inner wall of the tank body is heated and dried by the hot dry air, so that the surface temperature of the inner wall of the tank body is higher than the dew point temperature by more than 3 ℃.
Further, in the step 2), spraying 120-150-mesh metal powder to the surface of the tank body subjected to sand blasting and phosphating passivation by using an electrostatic spraying machine to form a 150-micron coating, and then baking, leveling and curing the coating at high temperature.
Further, the primer layer obtained in the step 3) comprises the following components in parts by weight: 200 parts of modified phenolic epoxy resin base stock, 30 parts of accelerator DMP-30, 70 parts of ethyl acetate and 40 parts of n-butyl alcohol mixed solution as diluent, 80 parts of triethylene tetramine curing agent, 5 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent; the technological parameters of the airless spraying of the primer layer are as follows: the aperture of the nozzle is 0.46-0.69 mm, the fluid spraying pressure is 20MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure of the paint spraying pump is 45: 1; the spraying is carried out twice, and the thickness of the dry film sprayed in each time is 100 mu m.
Further, the paint layer in the step 4) comprises the following components in parts by mass: 200 parts of vinyl ester resin glass flake daub, 40 parts of accelerator DMA-10, 30 parts of initiator CO1P, 80 parts of xylene and 40 parts of ethanol mixed solution as a diluent, 70 parts of m-xylylenediamine curing agent and 20 parts of vinyl trimethoxy silane coupling agent; the technological parameters of the high-pressure airless spraying of the intermediate paint layer are as follows: the aperture of the nozzle is 0.56-0.79 mm, the fluid spraying pressure is 25MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure of the paint spraying pump is 65: 1; the spraying is carried out twice, and the thickness of a dry film sprayed in each time is 350 mu m.
The finish paint layer in the step 5) comprises, by mass, 200 parts of an organic fluorine-silicon modified epoxy resin base material, 40 parts of an allyl glycidyl ether accelerator, 60 parts of butyl acetate and 40 parts of N-butanol mixed solution serving as a diluent, 70 parts of a low molecular polyamide curing agent, 5 parts of a polyether modified organic silicon defoaming agent and 20 parts of an N- (β -aminoethyl) -gamma-aminopropyltrimethoxysilane coupling agent, wherein the process parameters of the air-free spraying of the finish paint layer are that the aperture of a nozzle is 0.4-0.65 mm, the fluid spraying pressure is 20MPa, the air pressure of a paint spraying pump is 0.5-0.6 MPa, the pressure of the paint spraying pump is 45:1, and the spraying is performed twice, wherein the thickness of a dry film sprayed in each time is 100 micrometers.
Furthermore, in the sand blasting process, a dust explosion-proof monitoring alarm instrument is arranged in the tank body, and when the dust content of sand blasting exceeds a set safety alarm value, air is blown into the tank body through an air blower until the dust content in the tank body is reduced to be below a safety limit value.
Furthermore, in the airless spraying process, a toxic volatile gas monitoring alarm instrument is arranged in the tank body, and when the toxic volatile gas in the spraying process exceeds a safety set alarm value, the air is blown into the tank body through a blower until the content of the toxic volatile gas in the tank body is reduced to be below a safety limit value.
Further, in the airless spraying and airless blasting processes, an automatic spraying device is adopted to spray and blast the inner wall of the tank body, the automatic spraying device comprises a sliding track, a sliding trolley, a controller, a lifting assembly, a horizontal telescopic assembly, a distance measuring instrument and a spray gun assembly, the sliding track comprises an upper track and a lower track, the lower track is fixed on a bottom plate in the tank body in a spot welding manner, the upper track is fixedly arranged above the tank body through a support, the central axis of the sliding track and the central axis of the tank body are coaxially arranged, the sliding trolley is slidably connected on the lower track, the lifting assembly comprises a fixed guide part and a moving part movably connected on the fixed guide part, one end of the fixed guide part of the lifting assembly is fixed on the sliding trolley, the other end of the fixed guide part is connected with the upper track through the sliding assembly, one end of the horizontal telescopic assembly is connected on the moving, the other end of the horizontal telescopic component is connected with a spray gun component, the range finder is arranged at one end of the horizontal telescopic component connected with the spray gun component, the controller is fixedly connected to the sliding trolley, and the sliding trolley, the lifting component, the horizontal telescopic component, the range finder and the spray gun component are all electrically connected with the controller through cables.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the anticorrosive spraying method for the inner wall of the chemical storage tank, provided by the invention, after the inner wall of the tank body is subjected to sand blasting, a treatment process for phosphating passivation and spraying the metal powder coating on the surface of the inner wall of the tank body is added, the acid washing step after the traditional sand blasting process is avoided through phosphating passivation, the tiny sharp corners of the surface after sand blasting can be reduced, the phenomenon that the surface of the inner wall cannot be completely covered by a basic anticorrosive coating is prevented, and the continuity of the basic anticorrosive coating is ensured; the metal powder coating has high mechanical strength, strong adhesive force and better corrosion resistance and aging resistance, can effectively conduct static electricity generated by the flowing of petrochemical media, and can play a certain role in electrochemical protection on the tank body.
(2) According to the anticorrosion spraying method for the inner wall of the chemical storage tank, the primer layer and the middle paint layer are functional paint layers of a heavy anticorrosion system using epoxy resin as a film forming medium, so that the anticorrosion spraying method has the advantages of low curing temperature, stable film forming and the like, effectively solves the problem of poor anticorrosion performance caused by weak interaction among the coatings, and greatly improves the anticorrosion performance of a composite anticorrosion structure system; and because the coupling agent is added during the preparation of each paint layer, the coupling agent can react with certain groups on the surface of the reinforced material and also react with the matrix resin, an interface layer is formed between the reinforced material and the resin matrix, and the interface layer can transfer stress, so that the adhesion degree between the reinforced material and the resin is enhanced, the performance of the composite material is improved, and other media can be prevented from permeating into the interface.
(3) According to the anticorrosive spraying method for the inner wall of the chemical storage tank, the dust explosion-proof monitoring alarm and the toxic volatile gas monitoring alarm are respectively introduced to monitor in the processes of sand blasting and airless spraying, so that the safety and the environmental friendliness of the processes of sand blasting and airless spraying are effectively ensured.
(4) The anticorrosive spraying method for the inner wall of the chemical storage tank adopts the automatic spraying device for spraying, the directional sliding of the sliding trolley on the sliding track is utilized to push the directional movement of the whole spraying device, the inner wall of the storage tank at the same height can be effectively and effectively sprayed until the circular movement is finished and the inner wall returns to the starting point, the rotating movement of the whole device is not required to be realized through an automatic control device, the operation is simpler and more reliable, the whole spraying device has stable structure in the moving process, the reaction force brought by the spray gun assembly, the centrifugal force when the sliding trolley directionally circularly moves, the friction guiding force of the lower track to the sliding trolley, the traction force of the upper track to the whole device and the like are effectively balanced, the comprehensive stress balance is excellent, and the uniformity of a sprayed coating is ensured.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of the anticorrosive spraying method for the inner wall of the chemical storage tank according to the present invention;
FIG. 2 is a schematic view of the automatic coating apparatus of the present invention.
Description of reference numerals: 1. an upper rail; 2. a moving member; 3. a fixed guide; 4. a lower rail; 5. a sliding trolley; 6. a controller; 7. a cable; 8. a spray gun assembly; 9. a range finder; 10. a horizontal telescoping assembly; 11. a slide assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the embodiment provides an anticorrosive spraying method for an inner wall of a chemical storage tank, which includes the following steps:
(1) and carrying out surface sand blasting treatment on the inner wall of the tank body in an airless sand blasting manner, and carrying out phosphating passivation treatment on the surface of the inner wall of the tank body after sand blasting to form a stable phosphating film on the surface.
Specifically, the sand blasting treatment adopts an airless sand blasting machine, so that the cost is saved compared with the traditional automatic rotary disc sand blasting machine driven by an air compressor, and the automatic rotary disc sand blasting machine is more energy-saving and efficient due to the adoption of a variable frequency regulator; and have the usable filter core dust removal of independent dust removal case, ensure dustless environmental protection, but also can adjust the spray gun and by the distance of spraying face through the inductor, the height of automatic adjustment sandblast. Parameters of the sand blasting process: adopting 150-180 meshes of carborundum, wherein the sand blasting pressure is 2.5MPa, the sand blasting distance is 15-20 cm, the sand blasting angle between the carborundum and the inner wall surface of the tank body is 35-45 degrees, and the sand blasting quality requirement reaches Sa2.5 level; the sand blasting operation method of the airless sand blasting machine is the prior art and is not described in detail herein.
The process of the phosphating passivation treatment is as follows: firstly, sealing other outlets except an air inlet and an air outlet on a tank body; secondly, NaH is added2PO4、NaNO2Mixing the preservative with water according to the weight ratio of 1-2.5: 3-4: 12-25 to prepare a preservative treatment agent, and heating the preservative treatment agent to a water vapor state (namely 180-200 ℃) by using steam; then, adding the anti-corrosion treatment agent in a water vapor state from an air inlet of the tank body by using a wind conveying device, connecting an air outlet of the tank body back into the anti-corrosion treatment agent storage tank through a pipeline, wherein the initial temperature of the outer wall of the tank body is 5-38 ℃, and the anti-corrosion treatment agent in the water vapor state is maintained in the tank body for 10-12 hours, so that a phosphating film layer structure with the thickness of 3-5 microns can be formed on the surface of the inner wall of the tank body, and a certain protection effect is achieved on the surface of the inner wall of the tank body; finally, utilize dry absorption formula dehumidifier to produce dry hot-air, heat the drying to jar internal wall for jar internal wall surface temperature is higher than dew point temperature more than 3 ℃, not only can prevent like this that jar internal wall surface from having the steam condensation, can carry out a natural passivation treatment after the bonderizing in addition, can make the further oxidation of the metal that exposes in the bonderizing film space generate the passivation layer, play the effect of packing, oxidation to the bonderizing film, thereby make the bonderizing film more stable.
Through carrying out bonderizing passivation to jar internal wall after sand blasting, can not only play basic protection to jar body base member steel, but also can avoid the pickling step behind the traditional sand blasting technology, can reduce the small closed angle on surface after the sand blasting equally, prevent to appear the unable complete phenomenon that covers the inner wall surface of basic anticorrosive coating, guarantee the continuity of basic anticorrosive coating.
Optimally, in the sand blasting process, a dust explosion-proof monitoring alarm instrument can be arranged in the tank body, when the dust content of sand blasting exceeds a set safety alarm value, the whole sand blasting process is immediately stopped, air is blown into the tank body through an air blower until the dust content in the tank body is reduced to be below a safety limit value, then sand blasting rust removal operation is continued, and the safety and the environmental protection performance of the sand blasting rust removal process are effectively ensured.
(2) And spraying metal powder on the surface of the tank body subjected to sand blasting and phosphating passivation, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer.
In the embodiment, the metal powder is 120-150 meshes of zinc powder, the zinc powder is sprayed on the surface of the tank body subjected to sand blasting and phosphating passivation by using an electrostatic spraying machine, and under the electrostatic action, the zinc powder can be uniformly adsorbed on the surface of the tank body to form a coating with the thickness of 150 mu m; and then, carrying out high-temperature baking, leveling and curing on the sprayed zinc powder coating to form a metal powder bottom layer. The metal powder bottom layer formed by the powder spraying process has better mechanical strength, adhesive force, corrosion resistance, aging resistance and other properties, can effectively conduct static electricity, and can play a certain role in electrochemical protection of a sacrificial anode to protect a cathode matrix because zinc is more active relative to a tank body matrix material steel.
The metal powder in the step can be made of proper materials according to the actual use environment of the tank body, for example, for a special kerosene storage tank for aviation, aluminum powder can be selected instead of the zinc-containing coating as the bottom layer of the metal powder in the step because the precipitation of zinc products can influence the heat value performance of the kerosene storage tank.
(3) And spraying a primer layer on the surface of the metal powder bottom layer of the tank body in an airless spraying manner.
Specifically, the primer layer comprises the following components in parts by weight: 200 parts of modified phenolic epoxy resin base stock, 30 parts of accelerator DMP-30, 70 parts of ethyl acetate and 40 parts of n-butyl alcohol mixed solution as diluent, 80 parts of triethylene tetramine curing agent, 5 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent. During the preparation process of the primer layer coating, the base material is added into a container, the accelerator is added according to the proportion and is uniformly stirred, the initiator is added and is continuously and uniformly stirred, the mixture of the diluent and the coupling agent and the defoaming agent are added to adjust the viscosity of the coating, and finally the curing agent is added and is uniformly stirred under the non-vacuum stirring condition. The modified novolac epoxy resin base material adopted by the primer layer is prepared by taking thermosetting novolac resin and bisphenol A epoxy resin as raw materials, carrying out epoxidation reaction by taking novolac resin as a polymer skeleton under the catalysis of sodium hydroxide, carrying out chemical reaction by hydroxymethyl in the novolac resin and hydroxyl and epoxy groups in the epoxy resin, carrying out chemical reaction by phenolic hydroxyl in the novolac resin and epoxy groups in the epoxy resin, and finally crosslinking to form a complex body structure, wherein the modified novolac epoxy resin base material has high thermal stability of the novolac resin and main reactivity of the epoxy resin, so that the modification purpose is achieved, the closed rust resistance, acid and alkali resistance and corrosion resistance can be better achieved, the brittleness of the novolac resin is improved, the novolac epoxy resin is enabled to have higher toughness, and meanwhile, the epoxy resin has excellent adhesion property; the defect of poor alkali resistance of the phenolic resin is improved, and the phenolic resin has the characteristics of acid resistance and alkali resistance of epoxy resin and has good resistance to aromatic and aliphatic solvents; improves the defect of poor heat resistance of the epoxy resin and simultaneously has excellent heat resistance of the phenolic resin.
In the embodiment, the primer layer is formed by airless spraying instead of traditional air spraying, so that the defects of repeated spraying and poor paint film forming are avoided. The technological parameters of airless spraying are as follows: the aperture of the nozzle is 0.46-0.69 mm, the fluid spraying pressure is 20MPa, the air of the paint spraying pump is 0.5-0.6 MPa, and the pressure of the paint spraying pump is 45: 1; spraying twice, wherein the thickness of a dry film sprayed in each time is 100 mu m, the time interval of the two-time coating is controlled, the minimum interval time of the two-time coating is only 4h, and the maximum interval time can reach 24 h.
Finally, the drying and absorbing type dehumidifier is utilized to generate dry hot air to heat, dry and dehumidify the interior of the tank body, and the heating requirement reaches that the surface temperature of the steel plate of the tank body is higher than the dew point temperature by more than 3 ℃, so that the water vapor condensation on the surface of the base body of the tank body can be prevented, and the primer layer can be better cured.
(4) And spraying a middle paint layer on the surface of the primer layer of the tank body in a high-pressure airless spraying mode.
Specifically, the intermediate paint layer comprises the following components in parts by mass: 200 parts of vinyl ester resin glass flake daub, 40 parts of accelerator DMA-10, 30 parts of initiator CO1P, 80 parts of xylene and 40 parts of ethanol mixed solution as a diluent, 70 parts of m-xylylenediamine curing agent and 20 parts of vinyl trimethoxy silane coupling agent. During the preparation process of the intermediate paint layer, firstly, the daub base material is added into a container, the accelerant is added in proportion and stirred uniformly, then the initiator is added and stirred uniformly, then the mixture of the diluent and the coupling agent and the defoaming agent are added to adjust the viscosity of the paint, and finally, the curing agent is added and stirred uniformly under the non-vacuum stirring condition. The vinyl ester resin glass flakes adopted by the middle paint layer are mainly prepared by carrying out ring-opening esterification reaction on methacrylic acid, epoxy resin and phenolic resin, the epoxy phenolic composite resin is used as a matrix at two ends of the resin, and the two ends of the molecule are provided with allyl groups, so that the epoxy phenolic composite resin has the characteristics of the epoxy phenolic composite resin and unsaturated polyester resin, the content of ester groups which are easy to be hydrolyzed and damaged in the molecular structure of the epoxy phenolic composite resin is less than that of general-purpose or bisphenol A unsaturated polyester, and the epoxy phenolic composite resin and the unsaturated polyester resin are under the space protection of adjacent cross-linked double bonds, so that the epoxy phenolic composite resin glass flakes; the middle paint layer coating of the embodiment is added with flaky glass flake (with the size of 2-5 mu m) fillers which are arranged in parallel or overlapped mode, and the sheets divide resin into a plurality of micro areas to separate microcracks and micropores in the resin, so that the impermeability of the coating is increased, the time and the resistance of corrosive media to the surface of the tank body base material are delayed, the corrosion life of the tank body base material is prolonged, and the surface of the coating becomes extremely hard and wear-resistant. In addition, the exothermic reaction after mixing of the vinyl ester glass flake coating can also promote the curing of the applied primer coating.
In the embodiment, the middle paint layer adopts a high-pressure airless spraying process to replace the traditional airless spraying, so that the best quality of the coating can be ensured. The technological parameters of high-pressure airless spraying are as follows: the aperture of the nozzle is 0.56-0.79 mm, the fluid spraying pressure is 25MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure of the paint spraying pump is 65: 1; spraying twice, wherein the thickness of a dry film sprayed in each time is 350 mu m, the time interval of the two-time coating is controlled, the minimum interval time of the two-time coating is only 4h, and the maximum interval time can reach 24 h.
Finally, the drying and absorbing type dehumidifier is utilized to generate dry hot air to heat, dry and dehumidify the interior of the tank body, and the heating requirement reaches that the surface temperature of the steel plate of the tank body is higher than the dew point temperature by more than 3 ℃, so that the water vapor condensation on the surface of the base body of the tank body can be prevented, and the better solidification of the intermediate coat layer is facilitated.
Optimally, as the paint of the middle paint layer contains a large amount of glass flakes, all in-pipe filters of a paint spraying pump and a spray gun are required to be removed before construction, so that the equipment is ensured to be in a good working state and the flow pipe is ensured to be sealed cleanly; in the spraying process, the temperature of a pump cylinder body is required to be monitored by using an infrared sensing temperature measuring gun at any time, if an airless sprayer becomes slow in reaction, small in spray amplitude or high in paint cylinder temperature, the spraying operation should be stopped immediately, the blockage conditions of the positions of a spray pipe, a gun head and the like are emphatically checked, and the airless sprayer is quickly cleaned by using a clean diluent, so that glass scale particles are prevented from being accumulated in the pump and a flow pipe for a long time, and a pit is generated on the surface to damage the surface.
(5) And spraying finish paint on the surface of the intermediate paint layer of the tank body in an airless spraying mode.
The finishing paint layer comprises, by mass, 200 parts of an organic fluorine-silicon modified epoxy resin base material, 40 parts of an allyl glycidyl ether accelerator, 60 parts of butyl acetate +40 parts of N-butanol mixed liquid serving as a diluent, 70 parts of a low molecular polyamide curing agent, 5 parts of a polyether modified organic silicon defoaming agent and 20 parts of an N- (β -aminoethyl) -gamma-aminopropyltrimethoxysilane coupling agent.
In the embodiment, the finish paint layer adopts airless spraying instead of air spraying, so that the defects of repeated spraying and poor paint film forming are avoided. The technological parameters of airless spraying are as follows: the aperture of the nozzle is 0.4-0.65 mm, the fluid spraying pressure is 20MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure of the paint spraying pump is 45: 1; spraying twice, wherein the thickness of a dry film sprayed in each time is 100 mu m, the time interval of the two-time coating is controlled, the minimum interval time of the two-time coating is only 4h, and the maximum interval time can reach 24 h.
Finally, the drying and absorbing type dehumidifier is utilized to generate dry hot air to heat, dry and dehumidify the interior of the tank body, and the heating requirement reaches that the surface temperature of the steel plate of the tank body is higher than the dew point temperature by more than 3 ℃, so that the water vapor condensation on the surface of the base body of the tank body can be prevented, and the surface paint layer can be better solidified.
Preferably, in the airless spraying process, a toxic volatile gas monitoring alarm instrument can be arranged in the tank body, when the toxic volatile gas in the spraying process exceeds a safety set alarm value, the whole spraying process is immediately stopped, air is blown into the tank body through an air blower until the content of the toxic volatile gas in the tank body is reduced to be below a safety limit value, and then the airless spraying operation is continued, so that the safety and the environmental protection performance of the airless spraying anticorrosive coating process are effectively ensured.
In addition, in the above spraying process, in order to make the spraying more efficient and uniform, an optimized implementation manner is that, in the airless spraying process, an automatic spraying device is used to spray the inner wall of the tank, as shown in fig. 2, the automatic spraying device comprises a sliding track, a sliding trolley 5, a controller 6, a lifting component, a horizontal telescopic component 10, a distance meter 9 and a spray gun component 8, the sliding track comprises an upper track 1 and a lower track 4, the lower track 4 is fixed on a bottom plate in the tank in a spot welding manner, the upper track 1 is fixedly arranged above the tank through a bracket, the central axis of the sliding track is coaxially arranged with the central axis of the tank, the diameter of the sliding track is slightly smaller than that of the tank, the distance between the spray gun component 8 and the sprayed surface (i.e. the inner wall of the tank) can be roughly determined by designing the diameter of the sliding track, so as to shorten the distance between the horizontal telescopic component, the accuracy of the spraying distance of the spray gun assembly 8 is guaranteed, meanwhile, the telescopic distance of the horizontal telescopic assembly 10 is short, and the stability of the whole device in the motion process is improved. The sliding trolley 5 is connected to the lower track 4 in a sliding mode, and the sliding trolley 5 can slide around the directional circumference of the lower track 4 only by giving power of linear motion to the sliding trolley 5 under the action of sliding friction force and centripetal guide force between the sliding trolley 5 and the lower track 4. The lifting assembly comprises a fixed guide part 3 and a moving part 2 movably connected to the fixed guide part 3, one end of the fixed guide part 3 of the lifting assembly is fixed to the sliding trolley 5, the other end of the fixed guide part is connected with the upper rail 1 through a sliding assembly 11, one end of a horizontal telescopic assembly 10 is connected to the moving part 2, the other end of the horizontal telescopic assembly is connected with the spray gun assembly 8, the distance measuring instrument 9 is arranged at one end of the horizontal telescopic assembly 10, which is connected with the spray gun assembly 8, the controller 6 is fixedly connected to the sliding trolley 5, and the sliding trolley 5, the lifting assembly, the horizontal telescopic assembly 10, the distance measuring instrument 9 and the spray gun assembly 8 are all electrically connected with the controller 6 through cables 7. When spraying operation is started, the distance measuring instrument 9 detects the distance between the spray gun assembly 8 and a sprayed surface and transmits a detection signal to the controller 6, the controller 6 controls the horizontal telescopic assembly 10 to stretch and contract to accurately adjust the distance between the spray gun assembly 8 and the sprayed surface to a preset value, the sliding trolley 5 completes directional circular motion around the lower track 4 at a uniform speed from the lowest position, and meanwhile, the spray gun assembly 8 uniformly and effectively sprays the inner wall of the tank body at the same height by a certain spraying amount; when the sliding trolley 5 moves back to the starting point, the sliding trolley 5 stops moving, after the moving piece 2 of the lifting assembly rises to a certain new height along the fixed guide piece 3, the sliding trolley 5 starts to do directional circular motion around the lower rail 4 again, and the spray gun assembly 8 completes the spraying operation of the inner wall of the tank body at the height at the same time; the whole work is driven to operate in such a circulating way until the spraying work of the inner wall of the whole tank body is finished. The range finder 9 can be a small and precise radar range finder. The whole spraying working process of this embodiment passes through controller 6 automatic control operation, has realized unmanned operation, and relative position between controller 6, sliding trolley 5, lifting unit, horizontal flexible subassembly 10, distancer 9, spray gun subassembly 8 electricity control structure is fixed moreover, all follows sliding trolley 5 and directional slides together to effectively avoid the cable winding problem that the cable brought when directional circumference removes.
Of course, the automatic spraying device can be used for spraying sand on the inner wall of the tank body in the airless sand blasting process, the difference is that the material used in the storage tank externally connected with the spray gun assembly 8 is different, the storage tank is filled with paint in the airless spraying process, and the storage tank is filled with carborundum in the airless sand blasting process.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (7)
1. An anticorrosive spraying method for the inner wall of a chemical storage tank is characterized by comprising the following steps:
1) carrying out surface sand blasting treatment on the inner wall of the tank body in an airless sand blasting manner, and carrying out phosphating passivation treatment on the inner wall surface of the tank body after sand blasting to form a stable phosphating film on the surface;
2) spraying metal powder on the surface of the tank body subjected to sand blasting and phosphating passivation treatment in the step 1) in an electrostatic spraying manner, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer; wherein the metal powder is 120-150 meshes of zinc powder or aluminum powder, and the spraying thickness of the metal powder is 150 mu m;
3) spraying a primer layer on the surface of the metal powder bottom layer in the step 2) in an airless spraying manner; the primer layer comprises the following components in parts by weight: 200 parts of modified phenolic epoxy resin base stock, 30 parts of accelerator DMP-30, 70 parts of ethyl acetate and 40 parts of n-butyl alcohol mixed solution as diluent, 80 parts of triethylene tetramine curing agent, 5 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent;
the technological parameters of the airless spraying of the primer layer are as follows: the aperture of the nozzle is 0.46-0.69 mm, the fluid spraying pressure is 20MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure ratio of the paint spraying pump is 45: 1; spraying twice, wherein the thickness of a dry film sprayed each time is 100 mu m;
4) spraying a middle paint layer on the surface of the primer layer in the step 3) in a high-pressure airless spraying mode; the middle paint layer comprises the following components in parts by weight: 200 parts of vinyl ester resin glass flake daub, 40 parts of accelerator DMA-10, 30 parts of initiator CO1P, 80 parts of xylene and 40 parts of ethanol mixed solution as a diluent, 70 parts of m-xylylenediamine curing agent and 20 parts of vinyl trimethoxy silane coupling agent;
the technological parameters of the high-pressure airless spraying of the intermediate paint layer are as follows: the aperture of the nozzle is 0.56-0.79 mm, the fluid spraying pressure is 25MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure ratio of the paint spraying pump is 65: 1; spraying twice, wherein the thickness of a dry film sprayed each time is 350 mu m;
5) and 4) spraying finish paint on the surface of the intermediate paint layer in the step 4) in an airless spraying mode.
2. The method for spraying the inner wall of the chemical storage tank with the corrosion protection function as claimed in claim 1, wherein the parameters of the sand blasting process in the step 1) are as follows: adopting 150-180 mesh carborundum, wherein the sand blasting pressure is 2.5MPa, the sand blasting distance is 15-20 cm, the sand blasting angle between the carborundum and the inner wall surface of the tank body is 35-45 degrees, and the sand blasting quality requirement reaches Sa2.5 grade.
3. The anticorrosive spraying method for the inner wall of the chemical storage tank as claimed in claim 1, wherein the phosphating passivation treatment process in the step 1) comprises the following steps:
a. sealing other outlets except the air inlet and the air outlet on the tank body;
b. reacting NaH with2PO4、NaNO2And water in a weight ratio of 1-2.5: 3-4: 12-25, mixing, preparing an antiseptic treatment agent, and heating the antiseptic treatment agent to a water vapor state through steam;
c. adding the anti-corrosion treatment agent in a water vapor state from an air inlet of the tank body by using a wind conveying device, and connecting an air outlet of the tank body back into the anti-corrosion treatment agent storage tank through a pipeline, wherein the initial temperature of the outer wall of the tank body is 5-38 ℃, and the maintenance time of the anti-corrosion treatment agent in the water vapor state in the tank body is 10-12 hours;
d. the inner wall of the tank body is heated and dried by the hot dry air, so that the surface temperature of the inner wall of the tank body is higher than the dew point temperature by more than 3 ℃.
4. The anticorrosive spraying method for the inner wall of the chemical storage tank according to claim 1, wherein the finish paint layer in the step 5) comprises the following components, by mass, 200 parts of an organic fluorosilicone modified epoxy resin base material, 40 parts of an allyl glycidyl ether accelerator, 60 parts of butyl acetate +40 parts of N-butanol mixed solution serving as a diluent, 70 parts of a low molecular polyamide curing agent, 5 parts of a polyether modified organic silicon defoamer, and 20 parts of an N- (β -aminoethyl) -gamma-aminopropyltrimethoxysilane coupling agent;
the technological parameters of airless spraying of the finish paint layer are as follows: the aperture of the nozzle is 0.4-0.65 mm, the fluid spraying pressure is 20MPa, the air pressure of the paint spraying pump is 0.5-0.6 MPa, and the pressure ratio of the paint spraying pump is 45: 1; the spraying is carried out twice, and the thickness of the dry film sprayed in each time is 100 mu m.
5. The anticorrosive spraying method for the inner wall of the chemical storage tank according to claim 1, wherein in the sand blasting process, a dust explosion-proof monitoring alarm instrument is arranged in the tank body, and when the dust content of the sand blasting exceeds a set safety alarm value, air is blown into the tank body through an air blower until the dust content in the tank body is reduced to be below a safety limit value.
6. The anticorrosive spraying method for the inner wall of the chemical storage tank according to claim 1, wherein in the airless spraying process, a toxic volatile gas monitoring alarm is arranged in the tank, and when the toxic volatile gas in the spraying process exceeds a safety set alarm value, air is blown into the tank through the blower until the content of the toxic volatile gas in the tank is reduced below a safety limit value.
7. The anticorrosive spraying method for the inner wall of the chemical storage tank according to claim 1, wherein in the airless spraying and the airless blasting processes, the inner wall of the tank body is sprayed and blasted by using an automatic spraying device, the automatic spraying device comprises a sliding rail, a sliding trolley, a controller, a lifting assembly, a horizontal telescopic assembly, a distance meter and a spray gun assembly, the sliding rail comprises an upper rail and a lower rail, the lower rail is fixed on a bottom plate in the tank body in a spot welding manner, the upper rail is fixedly arranged above the tank body through a bracket, the central axis of the sliding rail is coaxial with the central axis of the tank body, the sliding trolley is connected on the lower rail in a sliding manner, the lifting assembly comprises a fixed guide member and a moving member movably connected on the fixed guide member, one end of the fixed guide member of the lifting assembly is fixed on the sliding trolley, the other end of the horizontal telescopic assembly is connected with the upper track through a sliding assembly, one end of the horizontal telescopic assembly is connected to the moving member, the other end of the horizontal telescopic assembly is connected with the spray gun assembly, the range finder is arranged at one end of the horizontal telescopic assembly, which is connected with the spray gun assembly, the controller is fixedly connected to the sliding trolley, and the sliding trolley, the lifting assembly, the horizontal telescopic assembly, the range finder and the spray gun assembly are all electrically connected with the controller through cables.
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| CN112760001A (en) * | 2020-12-18 | 2021-05-07 | 四川吉石科技有限公司 | Sulfur-resistant inner coating corrosion-resistant structure for medium and large containers for oil and gas fields and construction method |
| CN113322460A (en) * | 2021-05-28 | 2021-08-31 | 江苏宇通干燥工程有限公司 | Processing method of vacuum equipment adopting laser cladding technology |
| CN113996614A (en) * | 2021-10-27 | 2022-02-01 | 胜利油田方圆防腐材料有限公司 | External corrosion-resistant oil field sewage storage tank and construction method thereof |
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| CN1789351A (en) * | 2005-12-23 | 2006-06-21 | 吴凡 | Glass flake plasticine coating |
| CN105665258A (en) * | 2016-04-08 | 2016-06-15 | 天津达璞瑞科技有限公司 | Anticorrosive coating for chemical storage tank and construction method thereof |
| CN106280881A (en) * | 2016-08-15 | 2017-01-04 | 湖南开磷雁峰塔涂料有限公司 | A kind of anticorrosive paint and preparation method thereof |
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| CN1789351A (en) * | 2005-12-23 | 2006-06-21 | 吴凡 | Glass flake plasticine coating |
| CN105665258A (en) * | 2016-04-08 | 2016-06-15 | 天津达璞瑞科技有限公司 | Anticorrosive coating for chemical storage tank and construction method thereof |
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