CN110589263A - Novel composite carbon steel floating disc and preparation method thereof - Google Patents
Novel composite carbon steel floating disc and preparation method thereof Download PDFInfo
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- CN110589263A CN110589263A CN201910964027.5A CN201910964027A CN110589263A CN 110589263 A CN110589263 A CN 110589263A CN 201910964027 A CN201910964027 A CN 201910964027A CN 110589263 A CN110589263 A CN 110589263A
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Classifications
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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
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a novel composite carbon steel floating plate and a preparation method thereof.A dipping part of the carbon steel floating plate is constructed after a conventional carbon steel floating plate is manufactured in a floating top oil tank, a special primer layer A and a prepreg layer of light-cured glass fiber reinforced plastic material are sequentially coated and/or paved on the inner wall of a through hole from inside to outside, an annular reinforcing ring is adhered to the tail end of the through hole and the surface layer of a bottom plate, and the inner circle of the reinforcing ring is right opposite to the inner diameter of the through hole; the side wall and the bottom plate are sequentially coated and/or paved with a special primer layer B, a first prepreg layer of light-cured glass fiber reinforced plastic material, a second prepreg layer of light-cured glass fiber reinforced plastic material and a conductive layer from inside to outside. According to the invention, the glass fiber reinforced plastic reinforcing layer is constructed on the lower surface of the carbon steel floating disc, so that the service life of the carbon steel floating disc can be greatly prolonged, and the operation safety of the floating disc is improved; by adopting the novel light-cured glass fiber reinforced plastic prepreg construction process as the glass fiber reinforced plastic main body of the composite floating disc, the construction speed can be greatly improved, and the construction difficulty is reduced.
Description
Technical Field
The invention relates to a novel composite carbon steel floating disc and a preparation method thereof.
Background
With the upsizing of oil storage tanks and oil depots, the requirement on floating plates of floating-roof oil storage tanks is higher and higher. In recent years, lightning stroke accidents of a multi-floating-roof storage tank occur, the most serious accident is lightning stroke explosion accidents of an inner floating-roof storage tank, and in the accidents of the inner floating-roof storage tank, many reasons are that the floating plate is not tightly sealed, explosive gas exists in the storage tank, and the concentration of oil gas exceeds the standard near an exhaust port of the storage tank. Meanwhile, the untight sealing of the floating plate also causes the volatilization of a large amount of hydrocarbon gas, the problem of environmental pollution is prominent, and the air quality is seriously influenced; the volatilization of a large amount of oil gas also causes the loss of oil products, and the economic benefit is greatly influenced.
At present, a plurality of novel floating plates are arranged in the internal floating roof oil tank in China, and the novel floating plates comprise full-liquid-receiving spliced floating plates, full-liquid-receiving welded floating plates, glass fiber reinforced plastic floating plates and the like. With the implementation of the latest national fire protection code GB50160, the fire protection code exceeds 5000m at present3The storage tank preferably adopts a carbon steel floating plate. Carbon steel floating plates have been used for a long time and have presented a number of problems. For example, a large oil storage and transportation center analyzes a serious accident of 12-piece outer floating roof carbon steel floating discs in recent years, 1-piece tank body deformation is caused, 1-piece floating disc slide is damaged to cause a sinking disc, 1-piece oil is mixed with gas to cause the sinking disc, 4-piece central drainage is unsmooth to cause oil inflow, 2-piece corrosion causes the sinking disc, and 4-piece corrosion causes oil leakage to cause danger. It can be seen that the rate of corrosion accidents is highest in large external floating roof steel floating plates. In the inner floating roof carbon steel floating plate, the accident caused by corrosion is higher than that of the outer floating roof due to the unchanged inspection.
The main reason is that crude oil is produced in different places, the crude oil contains different components and impurities, the crude oil contains a large amount of ions and molecules which affect corrosion, including CL-, HCO3, SO4, H2S, CO2 and the like, the ions or molecules can electrochemically react with iron, and due to frequent manual valve operation, the erosion of sand and stones contained in the incoming oil to the bottom of the floating plate can cause the damage of an anticorrosive coating and aggravate the corrosion, and the floating plate cannot use measures such as anode protection and the like, can only rely on the anticorrosion, and once the anticorrosive coating is damaged, the serious corrosion can be quickly generated.
At present, a plurality of novel storage tanks are provided for enhancing the corrosion resistance of the storage tank, wherein a glass fiber reinforced plastic and carbon steel composite storage tank (a double-wall tank) is greatly applied, namely, a glass fiber reinforced plastic anti-corrosion layer is added on the inner wall of the original carbon steel storage tank, so that the corrosion resistance of the storage tank is greatly improved, and the service life of the storage tank is prolonged. The technology is widely popularized and applied at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel composite carbon steel floating plate and a preparation method thereof aiming at the defects in the prior art, which can accelerate the construction speed, reduce the field construction amount and the construction difficulty and have good design; the lower surface of the carbon steel floating disc is provided with the glass fiber reinforced plastic reinforcing layer, so that the service life of the carbon steel floating disc can be greatly prolonged, and the operation safety of the floating disc is improved; the prepared novel composite carbon steel floating plate is light in weight, high in strength, good in corrosion resistance and good in thermal performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing a novel composite carbon steel floating plate comprises the following steps of manufacturing a conventional carbon steel floating plate in a floating roof oil tank according to a traditional method, and performing light-curing glass fiber reinforced plastic construction on a liquid immersion part of the carbon steel floating plate after the carbon steel floating plate is manufactured, wherein the method comprises the following steps:
(1) pretreatment before construction: before construction, carrying out rust removal treatment on the carbon steel floating disc, and removing the rust on the bottom plate and the side wall of the carbon steel floating disc; because the direct bonding force of the glass fiber reinforced plastic and the carbon steel floating disc is weaker, in order to ensure the bonding strength, a layer of special primer is coated on the surface of the carbon steel floating disc, the special primer covers all the positions of the glass fiber reinforced plastic to be constructed, including the bottom plate, the side wall and the inner surface of the through hole to be constructed, so that the special primer is completely penetrated on the surface of the bottom plate, the surface of the side wall and the inner wall surface of the through hole; after the special primer is dried, the surfaces of the bottom plate and the uneven side surface of the carbon steel floating plate are subjected to putty coating treatment, so that the surfaces of the bottom plate and the side wall are smooth. The putty is not common putty, is prepared by mixing putty and resin, and has good adhesive force and strength with glass fiber reinforced plastic and primer.
(2) Constructing a through hole: the carbon steel floating plate is provided with a plurality of through holes, including manholes, guide post holes, floating plate leg holes and the like (the number of the through holes is different according to the size and the structure of the floating plate, the number of the through holes is also different, the number of the through holes is 1-2, the number of the guide post holes is 2, and the number of the legs is related to the diameter of the floating plate), the through holes are very easy to corrode, particularly the part contacting an oil surface, so the through holes also need to be covered with glass fiber reinforced plastics, and the through holes of the carbon steel floating plate need to be firstly covered with the glass fiber reinforced plastics and. After the special primer is coated and putty coating treatment in the step (1) is finished, constructing a through hole, and cutting the prepreg of the light-cured glass fiber reinforced plastic material into a rectangle with the length slightly larger than the perimeter of the through hole and the width 150mm larger than the immersion depth of the floating plate according to the perimeter of the through hole (because the common glass fiber reinforced plastic covering layer is 100mm from the bottom to the liquid level, and the bottom is provided with an outer edge of 50 mm); then coating interface glue on the special primer on the inner wall surface of the through hole (the interface glue is used for ensuring that no air bubbles exist during construction); then laying the cut rectangular prepreg into the through hole, reserving 50mm at the bottom, and repeatedly pressing the prepreg and the inner wall of the through hole by using a compression roller to ensure that the prepreg and the inner wall of the through hole are firmly pressed; flattening the inner part of the through hole, and flattening the 50mm prepreg reserved at the bottom towards the bottom of the floating disc bottom plate; and finally, cutting the prepreg of the light-cured glass fiber reinforced plastic material into an annular reinforcing ring, wherein the purpose of the reinforcing ring is to enhance the bonding strength between the bottom of the through hole and the floating disc, the diameter of the inner circle of the reinforcing ring is equal to and opposite to the diameter of the through hole, the distance between the diameter of the inner circle and the diameter of the outer circle is about 200mm generally, coating interface glue during construction, laying the prepreg, pressing by using a pressing roller, and rolling off bubbles. The through holes are cured simultaneously with the bottom plate and the side walls, and advanced light curing is not needed.
(3) Construction of the side wall: after the construction of the through hole in the step (2) is finished, constructing the side wall of the carbon steel floating plate, cutting the prepreg of the light-cured glass fiber reinforced plastic material into a rectangle, wherein the width of the first layer of prepreg is 100mm larger than the immersion depth of the floating plate, and the width of the second layer of prepreg is 200mm larger than the immersion depth of the floating plate; coating interface glue on a part, needing construction, of the side wall of the floating disc, then laying a first layer of prepreg, reserving 50mm at the bottom of the first layer of prepreg, repeatedly pressing the first layer of prepreg and the surface of the side wall to remove bubbles, and flattening the reserved first layer of prepreg with the length of 50mm to the bottom of the bottom plate of the floating disc to remove the bubbles; the surface layer of the first layer of prepreg is coated with interface adhesive, then a second layer of prepreg is laid, the bottom of the second layer of prepreg is reserved for 100mm, the second layer of prepreg is repeatedly compressed, bubbles are removed, the reserved second layer of prepreg with the length of 100mm is flattened and removed from the bottom of the floating plate bottom plate, the connecting gaps of the two layers of prepregs are staggered, and the strength is improved. After the side walls are laid, the light is not cured temporarily, and after the bottom plate is laid, the light is cured together.
(4) And (3) construction of the bottom plate: after the construction of the side wall in the step (3) is finished, constructing a bottom plate of the carbon steel floating plate, laying two layers of prepreg of the light-cured glass fiber reinforced plastic material on the bottom plate like the side wall, coating interface glue on the part of the surface of the bottom plate needing construction, laying a first layer of prepreg, repeatedly compacting and removing bubbles; then coating interface glue on the surface layer of the first layer of prepreg, laying the second layer of prepreg, repeatedly compacting and removing bubbles; laying two layers of prepreg until the outer edge is flush with the outer edge of the floating plate; when laying the prepreg, laying the lap joint gaps of the two layers in a staggered manner;
(5) and (3) photocuring treatment: after the construction of the through hole, the side wall and the bottom plate of the carbon steel floating plate is finished, carrying out photocuring treatment, wherein the photocuring adopts a special dual-waveband ultraviolet curing lamp, and the photocuring time is 30 minutes;
(6) detecting air bubbles and paving quality: after the photocuring construction in the step (5) is finished, detecting whether bubbles exist in the through hole, the side wall and the bottom plate of the carbon steel floating plate or not or whether bubbles fall off or not; if the film falls off, repairing; if bubbles exist, if the number of the bubbles with the diameter less than 0.5cm is less than 3 per square meter, local repair can be carried out, otherwise, the bubbles need to be scratched, the interface glue is coated, then light is supplemented to cure the prepreg of the glass fiber reinforced plastic material, and meanwhile, the light curing treatment needs to be carried out again on the repaired position;
(7) coating a conductive layer: mixing 99.48% of resin, 0.5% of pre-accelerator and 0.02% of inhibitor in percentage by mass for not less than 3 hours to obtain pre-accelerated resin after mixing; mixing 83% of pre-accelerating resin, 15% of graphite and 2% of curing agent in percentage by mass to obtain conductive resin; and coating the obtained conductive resin on the side wall and the bottom plate of the carbon steel floating disc so as to cover a second layer of prepreg, forming a conductive layer by using the conductive resin, and coating the conductive layer to obtain the novel composite carbon steel floating disc.
In the above technical solution, in the step (1), the rust removing treatment means: if a new floating disc is constructed, even if the plate is subjected to primary rust removal treatment after the new floating disc is welded, secondary rust removal treatment needs to be carried out on the new floating disc to remove the rust on the surface of the floating disc; if the old floating plate is constructed, the old floating plate is directly subjected to rust removal treatment, and the rust on the surface of the floating plate is removed.
In the technical scheme, the step (1) of coating the special primer refers to the following steps: the special paint can enhance the bonding strength of the glass fiber reinforced plastic and the floating disc according to the materials used for the floating disc and the special paint, the priming paint is sequentially brushed, the corners, cracks, pockmarks and uneven parts are firstly brushed by the special priming paint, then the whole body is uniformly and finely brushed in sequence, the special priming paint is brushed in a criss-cross mode, the whole base surface is enabled to completely penetrate the special priming paint, the paint film defects such as missing painting and pinhole steam bubbles are avoided, and the special priming paint is brushed mainly for ensuring the bonding strength of the glass fiber reinforced plastic and the carbon steel after construction.
In the above technical solution, in the step (1), the puttying means: putty coating treatment is carried out on the internal corner of the floating disc, the internal corner is made into a round corner (generally R is more than 10mm), and the surface is dried and cleaned; if the surface layers of the bottom plate and the side wall of the floating disc are relatively flat, putty scraping is not needed, and if the surface layers of the bottom plate and the side wall are sunken, putty is needed to be used for leveling; the glass fiber reinforced plastic prepreg can be tightly attached to the external corner of the carbon steel part, but is not tightly attached to the internal corner, so that the internal corner needs to be treated; in addition, the coating and scraping of the putty should be mainly performed by leveling as much as possible, and the defects of roll skin, cracks, pits and the like cannot occur.
In the above technical scheme, in the step (1), the special primer is a paint having a good adhesive strength with both selected glass fiber reinforced plastic resin and carbon steel, and a paint having a high epoxy vinyl strength of asian lan 8084 is selected as a special primer according to characteristics, and the paint has a good adhesive strength with both carbon steel and glass fiber reinforced plastic.
In the technical scheme, in the step (1), the thickness is 50-80 μm when the special primer is coated.
In the above technical scheme, in the step (1), the putty comprises light-cured resin and common putty, the material of the light-cured resin is the same as that of the resin in the light-cured fiberglass reinforced plastic material, the common putty is commercially available putty commonly used for wall surface leveling, and the mass of the common putty is 1.5-2.5 times that of the light-cured resin. Sometimes, in order to increase the adhesion, a small amount of asbestos wool or glass wool is added, and the diluent is added as little as possible.
In the above technical scheme, in the step (2), when the through hole is constructed, the thickness of the prepreg of the photo-curing glass fiber reinforced plastic material is 1-2 mm.
In the technical scheme, in the step (3), when the side wall is constructed, the thickness of the prepreg of the first layer of the light-cured glass fiber reinforced plastic material is 1-1.5 mm; the thickness of the second layer of prepreg of the light-cured glass fiber reinforced plastic material is 1-1.5 mm.
In the technical scheme, in the step (4), when the bottom plate is constructed, the thickness of the prepreg of the first layer of the light-cured glass fiber reinforced plastic material is 1-1.5 mm; the thickness of the second layer of prepreg of the light-cured glass fiber reinforced plastic material is 1-1.5 mm.
In the technical scheme, in the step (3) and the step (4), when two layers of prepregs of the side wall and the bottom plate of the floating plate are laid, joints of the two layers need to be laid in a staggered mode; secondly, coating interface adhesive at all the prepreg cuts, because glass fibers may leak out at the cuts, the coating of the interface adhesive can prevent the leaked glass fibers from absorbing oil and causing oil to invade the glass fiber reinforced plastic.
In the above technical solution, there are generally two forms of photocuring in step (5), one is curing while constructing, that is, curing is performed by laying a curing lamp every section of construction, and the other is curing uniformly after all the constructions are completed (since the thickness of the prepreg is 1-1.5mm, the total thickness of two layers is less than 5mm, curing can be performed at one time). The invention carries out light curing after the construction of the through hole, the side wall and the bottom plate is finished. In the case of curing by photocuring, a UV light source is required to excite the photoinitiator in the formulation to generate free radicals or cations, and then the polymerization reaction is initiated to complete the conversion from liquid to solid. In the construction in the storage tank, in order to ensure the safety, the special dual-band ultraviolet curing lamp is used as a curing light source, the power of the special dual-band ultraviolet curing lamp is about 100W-200W, the service life is generally 2-3 years, and a 12V direct-current power supply is used. The curing lamps are discharged to ensure that all of the laid prepreg is exposed to: the longitudinal spacing of the general curing lamps is 20cm, the transverse spacing is 30cm, the curing time is 30 minutes, and in order to facilitate the construction of the through holes, the curing lamps are designed into two forms, namely a general rectangle for the light curing construction of the bottom plate and the side wall, and a cylinder with the diameter of 40mm for the light curing construction of the through holes.
In the technical scheme, in the step (6), when the phenomenon of air bubbles or falling off is detected, the iron wire can be tapped by taking an elbow or a small wooden hammer, if the sound is clear and crisp, the description is good, and if the sound of a shell is loud, the phenomenon of air bubbles and delamination exists; if delamination defects are found, repairing; if the number of the bubbles with the diameter less than 0.5cm is less than 3 per square meter, local repair can be carried out, otherwise, the bubbles are required to be scratched to add the repair prepreg; the quality requirement of laying the prepreg of the light-cured glass fiber reinforced plastic material is that the prepreg has no quality defects such as bubbles, delaminations, bubbles and the like; secondly, the color of the prepreg is uniform, white spots and white stubbles cannot appear, the whole surface of the glass fiber reinforced plastic is in the color of semitransparent glue stock, and obvious defects such as cracks, shadows and the like cannot be caused.
In the above technical scheme, the prepregs made of the light-cured glass fiber reinforced plastic material used in the present invention are all prepregs made of a light-cured glass fiber reinforced plastic material with a chopped strand mat as a framework. The glass fiber framework of the conventional prepreg has multiple forms, mainly comprises two types of chopped strand mats and glass fiber cloth, and the construction of the floating disc adopts the prepreg of the chopped strand mat framework for strengthening the oil-proof effect.
In the technical scheme, the interface adhesive used in the invention is the light-cured resin, the material of the light-cured resin is the same as that of the resin in the light-cured glass fiber reinforced plastic material, and the light-cured resin is coated on the surface to be laid when the prepreg is constructed and laid, so that bubbles between the prepreg and the surface can be removed.
In the technical scheme, the coating thickness of the interface adhesive used by the invention is 0.08-0.12mm, and preferably about 0.1 mm.
In the above technical solution, in the step (7), when the conductive layer is coated, the resin is a non-light-cured resin, and the material of the resin is the same as that of the resin in the ordinary glass fiber reinforced plastic material, and in practical application, the ordinary resin with the same type as that of the resin in the light-cured glass fiber reinforced plastic material is preferred; the pre-accelerator is 6% of cobalt naphthenate; the inhibitor is acetylacetone; the graphite is 800 meshes of graphite; the curing agent is 925H curing agent.
In the above technical scheme, in the step (7), the conductive resin is coated to a thickness of 0.5-0.6 mm.
In the invention, in order to accelerate the construction speed and reduce the field construction amount, the novel light-cured glass fiber reinforced plastic prepreg is adopted as the glass fiber reinforced plastic main body of the composite floating disc, so that the construction speed can be greatly improved, and the construction difficulty is reduced. The light-cured glass fiber reinforced plastic material is a glass fiber reinforced composite material which takes unsaturated polyester resin/vinyl ester resin as a matrix, is added with anticorrosive functional filler and takes glass fiber as a reinforcement. By adopting a UV curing technology, under the irradiation action of ultraviolet rays, the composite material matrix resin is initiated by the photoinitiator to generate a cross-linking polymerization reaction. The light-cured glass fiber reinforced plastic material is presoaked in a factory, can be stored for a long time, and is subjected to UV curing when in use. Before construction, the light-cured glass fiber reinforced plastic material is in a soft sheet shape, and the upper surface and the lower surface of the light-cured glass fiber reinforced plastic material are respectively provided with a layer of plastic film which is a composite material capable of being stored at normal temperature; when the prepreg is constructed, firstly the film is torn off to enable the sheet to be tightly adhered to the surface of an object, then the sheet is cured by adopting an ultraviolet irradiation mode, and finally the upper film is torn off. The cured sheet has the characteristics of compact material, lightness, toughness and corrosion resistance. The light-cured resin has the characteristics that: compared with hand-pasted or sprayed glass fiber reinforced plastic, the light-cured glass fiber reinforced plastic has higher strength; the process is simple, the glass fiber reinforced plastic can be made into coiled materials with the width of 1-2 meters and the length of 10 meters in a factory in advance, the site construction is simple and quick, and the requirements of constructors are reduced; the light-cured resin can be used in high-humidity occasions, and the problem that hand pasting or glass fiber reinforced plastic spraying cannot be carried out in the high-humidity occasions is solved.
The invention also provides a novel composite carbon steel floating disc prepared by the method, the novel composite carbon steel floating disc is positioned in the floating roof oil tank, and is wrapped with the floating disc main body and the anti-corrosion layer on the floating disc main body, and the novel composite carbon steel floating disc is characterized in that:
the inner wall of the through hole of the floating disc main body is sequentially coated and/or paved with a special primer layer A and a prepreg layer of a light-cured glass fiber reinforced plastic material from inside to outside, the tail end of the through hole and the surface layer of the bottom plate are adhered with an annular reinforcing ring, and the inner circle of the reinforcing ring is right opposite to the inner diameter of the through hole; the specially-made primer layer, the prepreg layer of the photocuring glass fiber reinforced plastic material and the reinforcing ring form an anti-corrosion layer of the through hole;
the side wall and the bottom plate of the floating plate main body are sequentially coated and/or paved with a special primer layer B, a first layer of prepreg layer of light-cured glass fiber reinforced plastic material, a second layer of prepreg layer of light-cured glass fiber reinforced plastic material and a conductive layer from inside to outside, and the special primer layer, the first layer of prepreg layer of light-cured glass fiber reinforced plastic material, the second layer of prepreg layer of light-cured glass fiber reinforced plastic material and the conductive layer form an anti-corrosion layer of the side wall and the bottom plate.
In the technical scheme, the thickness of the special primer layer A in the through hole is 50-80 μm; the thickness of the special primer layer B on the side wall and the bottom plate is 50-80 μm.
In the technical scheme, the thickness of the prepreg layer of the light-cured glass fiber reinforced plastic material in the through hole is 1-2 mm; the thickness of the prepreg layer of the first layer of the light-cured glass fiber reinforced plastic material on the side wall and the bottom plate is 1-1.5mm, and the thickness of the prepreg layer of the second layer of the light-cured glass fiber reinforced plastic material is 1-1.5 mm.
In the technical scheme, the thickness of the conducting layer is 0.5-0.6 mm.
In the technical scheme, the reinforcing ring is made of prepreg made of light-cured glass fiber reinforced plastic material and has the thickness of 1-2 mm; the diameter of the inner circle of the reinforcing ring is equal to that of the through hole, and the distance between the inner circle and the outer circle of the annular reinforcing ring is 200 mm.
In the technical scheme, the prepreg of the light-cured glass fiber reinforced plastic material is cut into a rectangle with the length slightly larger than the perimeter of the through hole and the width larger than the immersion depth of the floating disc by 150mm, the rectangle is coated with interface glue and then is laid in the through hole, the bottom of the through hole is reserved by 50mm, the prepreg and the inner wall of the through hole are repeatedly pressed by a press roller, and finally, the prepreg layer of the light-cured glass fiber reinforced plastic material in the through hole is formed after the prepreg with the length of 50mm reserved at the bottom is flattened towards the bottom of the bottom plate of the; the reinforcing ring is arranged after the reserved prepreg with the length of 50mm is flattened towards the bottom of the floating plate bottom plate.
Among the above-mentioned technical scheme, cut into the rectangle with the prepreg of photocuring glass steel material, the width is 100mm more than the floating plate immersion fluid degree of depth, brushes interface glue at the position that the lateral wall of floating plate needs to be under construction, then lays rectangular prepreg and goes, and 50mm is reserved to the bottom of prepreg, compresses tightly the prepreg repeatedly, and the long prepreg of 50mm who will reserve is flattened to the bottom of floating plate bottom plate and is constituted the prepreg layer of first layer photocuring glass steel material on the lateral wall again.
In the technical scheme, the prepreg made of the light-cured glass fiber reinforced plastic material is cut into a rectangle, and the width of the prepreg is 200mm larger than the immersion depth of the floating plate; coating interface glue on the surface layer of the prepreg layer of the first layer of light-cured glass fiber reinforced plastic material, then laying the rectangular prepreg, reserving 100mm at the bottom of the prepreg, repeatedly pressing the prepreg, and flattening the reserved prepreg with the length of 100mm towards the bottom of the floating plate bottom plate to form the prepreg layer of the second layer of light-cured glass fiber reinforced plastic material on the side wall.
The technical advantages of the invention are as follows:
1. the glass fiber reinforced plastic has light weight and high strength, the relative density of the glass fiber reinforced plastic is between 1.5 and 2.0, only the carbon steel is 1/4 to 1/5, but the tensile strength is close to or even exceeds that of the carbon steel, and the specific strength can be compared with high-grade alloy steel. Thus, excellent results have been achieved in aerospace, rocket, spacecraft, high pressure vessels, and in other article applications where weight reduction is desired. The tensile strength, the bending strength and the compressive strength of some epoxy FRP can reach more than 400 MPa.
2. The glass fiber reinforced plastic is a good corrosion-resistant material and has high resistance to atmosphere, water, acid, alkali, salt with common concentration and various oils and solvents. Has been applied to various aspects of chemical industry corrosion prevention and is replacing carbon steel, stainless steel, wood, nonferrous metal and the like.
3. The thermal performance is good, the thermal conductivity of the glass fiber reinforced plastic is low, the thermal conductivity is 1.25-1.67 kJ/(mHK) at room temperature, only the metal is 1/100-1/1000, and the glass fiber reinforced plastic is an excellent heat insulating material. Under the condition of instantaneous ultrahigh temperature, the material is an ideal thermal protection and ablation-resistant material, and can protect the spacecraft from being washed by high-speed airflow at the temperature of more than 2000 ℃. The novel floating plate can effectively protect the medium in the tank.
4. The designability is good. Various structural products can be flexibly designed according to the requirements to meet the use requirements, so that the products have good integrity.
5. The manufacturability is excellent, can be according to the shape of the product, technical requirement, use and quantity to choose the shaping process flexibly.
Drawings
FIG. 1: the structure schematic diagram of the novel composite carbon steel floating disc;
FIG. 2: the structure schematic diagram of a through hole in the novel composite carbon steel floating disc;
FIG. 3: the structural schematic diagram of the middle bottom plate of the novel composite carbon steel floating plate;
wherein: 1 is a through hole of the carbon steel floating disc, 2 is a side wall of the carbon steel floating disc, 3 is a bottom plate of the carbon steel floating disc, and 4 is a special primer layer A; 5 is a prepreg layer of light-cured glass fiber reinforced plastic material; 6 is a reinforcing ring; 7 is a special primer layer B; 8 is a prepreg layer of a first layer of light-cured fiberglass reinforced plastic material; 9 is a second prepreg layer of light-cured fiberglass reinforced plastic material; 10 is a conductive layer; 11 is the immersion position; 12 is a floating roof tank. .
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following descriptions:
the invention firstly provides a preparation method of a novel composite carbon steel floating disc, which comprises the following steps:
(1) pretreatment before construction: before construction, carrying out rust removal treatment on the carbon steel floating disc, and removing the rust on the bottom plate and the side wall of the carbon steel floating disc; then coating a layer of special primer on the bottom plate, the side wall and the inner surface of the through hole to be constructed of the carbon steel floating disc, so that the special primer is completely penetrated on the surface of the bottom plate, the surface of the side wall and the inner surface of the through hole; after the special primer is dried completely, performing putty coating treatment on the surfaces of the bottom plate and the part with uneven side surfaces to smooth the surfaces of the bottom plate and the side walls;
(2) constructing a through hole: the through hole on the carbon steel floating disc comprises a manhole, a guide post hole and a floating disc support leg hole, and after the pretreatment in the step (1) is completed, the through hole is constructed: firstly, cutting a prepreg of a light-cured glass fiber reinforced plastic material into a rectangle with the length slightly larger than the perimeter of the through hole and the width 150mm larger than the immersion depth of a floating disc according to the perimeter of the through hole; then coating interface glue on the special primer on the inner wall surface of the through hole; then laying the cut rectangular prepreg into the through hole, reserving 50mm at the bottom, and repeatedly pressing the prepreg and the inner wall of the through hole by using a compression roller to ensure that the prepreg and the inner wall of the through hole are firmly pressed; flattening the inner part of the through hole, and flattening the prepreg with the length of 50mm reserved at the bottom to the bottom of the floating disc bottom plate; finally, cutting the prepreg of the light-cured glass fiber reinforced plastic material into an annular reinforcing ring, wherein the diameter of the inner circle of the reinforcing ring is equal to and opposite to the diameter of the through hole, the distance between the inner circle and the outer circle of the reinforcing ring is 200mm, coating interface glue during construction, laying the prepreg, pressing by using a press roller, and rolling off bubbles;
(3) construction of the side wall: after the construction of the through hole in the step (2) is finished, constructing the side wall of the carbon steel floating plate, cutting the prepreg of the light-cured glass fiber reinforced plastic material into a rectangle, wherein the width of the first layer of prepreg is 100mm larger than the immersion depth of the floating plate, and the width of the second layer of prepreg is 200mm larger than the immersion depth of the floating plate; coating interface glue on a part, needing construction, of the side wall of the floating disc, then laying a first layer of prepreg, reserving 50mm at the bottom of the first layer of prepreg, repeatedly pressing the first layer of prepreg and the surface of the side wall to remove bubbles, and flattening the reserved first layer of prepreg with the length of 50mm to the bottom of the bottom plate of the floating disc to remove the bubbles; coating interface glue on the surface layer of the first layer of prepreg, then laying a second layer of prepreg, reserving 100mm at the bottom of the second layer of prepreg, repeatedly compacting the second layer of prepreg to remove bubbles, and flattening the reserved 100mm long second layer of prepreg to the bottom of the floating disc bottom plate to remove the bubbles;
(4) and (3) construction of the bottom plate: after the construction of the side wall in the step (3) is finished, constructing a bottom plate of the carbon steel floating plate, laying two layers of prepreg of the light-cured glass fiber reinforced plastic material on the bottom plate like the side wall, coating interface glue on the part of the surface of the bottom plate needing construction, laying a first layer of prepreg, repeatedly compacting and removing bubbles; then coating interface glue on the surface layer of the first layer of prepreg, laying the second layer of prepreg, repeatedly compacting and removing bubbles; laying two layers of prepreg until the outer edge is flush with the outer edge of the floating plate; when laying the prepreg, laying the lap joint gaps of the two layers in a staggered manner;
(5) and (3) photocuring treatment: after the construction of the through hole, the side wall and the bottom plate of the carbon steel floating plate is finished, carrying out photocuring treatment, wherein the photocuring adopts a special dual-waveband ultraviolet curing lamp, and the photocuring time is 30 minutes;
(6) detecting air bubbles and paving quality: after the photocuring construction in the step (5) is finished, detecting whether bubbles exist in the through hole, the side wall and the bottom plate of the carbon steel floating plate or not or whether bubbles fall off or not; if the film falls off, repairing; if bubbles exist, if the number of the bubbles with the diameter less than 0.5cm is less than 3 per square meter, local repair can be carried out, otherwise, the bubbles need to be scratched, the interface glue is coated, then light is supplemented to cure the prepreg of the glass fiber reinforced plastic material, and meanwhile, the light curing treatment needs to be carried out again on the repaired position;
(7) coating a conductive layer: mixing 99.48% of resin, 0.5% of pre-accelerator and 0.02% of inhibitor in percentage by mass for not less than 3 hours to obtain pre-accelerated resin after mixing; mixing 83% of pre-accelerating resin, 15% of graphite and 2% of curing agent in percentage by mass to obtain conductive resin; and coating the obtained conductive resin on the side wall and the bottom plate of the carbon steel floating disc so as to cover a second layer of prepreg, forming a conductive layer by using the conductive resin, and coating the conductive layer to obtain the novel composite carbon steel floating disc.
The invention also provides a novel composite carbon steel floating disc, which is positioned in the floating-roof oil tank 12 and is shown in figures 1-3:
the inner wall of a through hole 1 of the floating disc main body is sequentially coated and/or paved with a special primer layer A4 and a prepreg layer 5 made of light-cured glass fiber reinforced plastic material from inside to outside, the tail end of the through hole and the surface layer of the bottom plate are adhered with an annular reinforcing ring 6, and the inner circle of the reinforcing ring is right opposite to the inner diameter of the through hole; the specially-made primer layer, the prepreg layer of the photocuring glass fiber reinforced plastic material and the reinforcing ring form an anti-corrosion layer of the through hole;
the side wall 2 and the bottom plate 3 of the floating plate main body are sequentially coated and/or paved with a special primer layer B7, a first layer of prepreg layer 8 made of light-cured glass fiber reinforced plastic material, a second layer of prepreg layer 9 made of light-cured glass fiber reinforced plastic material and a conductive layer 10 from inside to outside, and the special primer layer, the first layer of prepreg layer made of light-cured glass fiber reinforced plastic material, the second layer of prepreg layer made of light-cured glass fiber reinforced plastic material and the conductive layer form an anti-corrosion layer of the side wall and the bottom plate;
the thickness of the special primer layer A4 in the through hole is 50-80 μm; the thickness of the special primer layer B7 on the side wall and the bottom plate is 50-80 μm; the thickness of the conductive layer 10 is 0.5-0.6 mm;
the thickness of the prepreg layer 5 of the light-cured glass fiber reinforced plastic material in the through hole is 1-2 mm; the thickness of the prepreg layer 8 of the first layer of the light-cured glass fiber reinforced plastic material on the side wall and the bottom plate is 1-1.5mm, and the thickness of the prepreg layer 9 of the second layer of the light-cured glass fiber reinforced plastic material is 1-1.5 mm; the reinforcing ring 6 is made of prepreg of light-cured glass fiber reinforced plastic material and has the thickness of 1-2 mm; the diameter of the inner circle of the reinforcing ring is equal to that of the through hole, and the distance between the inner circle and the outer circle of the annular reinforcing ring is 200 mm.
The method and the structure of the novel composite carbon steel floating plate are explained by combining the specific examples as follows:
example 1:
in the embodiment, the used prepreg of the light-cured glass fiber reinforced plastic material is a CP201 prepreg sheet produced by Beijing Yingtou technology, the thickness is 1.5mm, and the width is 2 meters; the 470 photo-curing resin and the E glass fiber chopped strand mat are adopted as main raw materials, and the high-strength and corrosion-resistant glass fiber chopped strand mat has high strength and corrosion resistance. In this embodiment, the interface adhesive is 470 photo-curable resin, and the coating thickness is about 0.1 mm.
A method for preparing a novel composite carbon steel floating plate, wherein a conventional carbon steel floating plate is manufactured in a floating roof oil tank according to a traditional method, and after the carbon steel floating plate is manufactured, the construction of photocuring glass fiber reinforced plastic materials is carried out on the immersion part of the carbon steel floating plate, and the method comprises the following steps:
(1) pretreatment before construction: before construction, carrying out rust removal treatment on the carbon steel floating disc, and removing the rust on the bottom plate and the side wall of the carbon steel floating disc; then coating a layer of special primer on the bottom plate, the side wall and the inner surface of the through hole to be constructed of the carbon steel floating disc, so that the special primer is completely penetrated on the surface of the bottom plate, the surface of the side wall and the inner surface of the through hole; after the special primer is dried completely, performing putty coating treatment on the surfaces of the bottom plate and the part with uneven side surfaces to smooth the surfaces of the bottom plate and the side walls;
the special primer is a Asalan 8084 epoxy vinyl high-strength paint, has better adhesive strength with light-cured 470 resin and carbon steel, and has the thickness of 50-80 mu m when the special primer is coated.
The putty comprises 470 light-cured resin and common putty, and the mass of the common putty is 2 times of that of the 470 light-cured resin.
(2) Constructing a through hole: the through hole on the carbon steel floating disc comprises a manhole, a guide post hole and a floating disc support leg hole, and after the pretreatment in the step (1) is completed, the through hole is constructed: firstly, cutting a prepreg of a light-cured glass fiber reinforced plastic material into a rectangle with the length slightly larger than the perimeter of the through hole and the width 150mm larger than the immersion depth of a floating disc according to the perimeter of the through hole; then coating interface glue on the special primer on the inner wall surface of the through hole; then laying the cut rectangular prepreg into the through hole, reserving 50mm at the bottom, and repeatedly pressing the prepreg and the inner wall of the through hole by using a compression roller to ensure that the prepreg and the inner wall of the through hole are firmly pressed; flattening the inner part of the through hole, and flattening the prepreg with the length of 50mm reserved at the bottom to the bottom of the floating disc bottom plate; finally, cutting the prepreg of the light-cured glass fiber reinforced plastic material into an annular reinforcing ring, wherein the diameter of the inner circle of the reinforcing ring is equal to and opposite to the diameter of the through hole, the distance between the inner circle and the outer circle of the reinforcing ring is 200mm, coating interface glue during construction, laying the prepreg, pressing by using a press roller, and rolling off bubbles; as shown in fig. 2.
(3) Construction of the side wall: after the construction of the through hole in the step (2) is finished, constructing the side wall of the carbon steel floating plate, cutting the prepreg of the light-cured glass fiber reinforced plastic material into a rectangle, wherein the width of the first layer of prepreg is 100mm larger than the immersion depth of the floating plate, and the width of the second layer of prepreg is 200mm larger than the immersion depth of the floating plate; coating interface glue on a part, needing construction, of the side wall of the floating disc, then laying a first layer of prepreg, reserving 50mm at the bottom of the first layer of prepreg, repeatedly pressing the first layer of prepreg and the surface of the side wall to remove bubbles, and flattening the reserved first layer of prepreg with the length of 50mm to the bottom of the bottom plate of the floating disc to remove the bubbles; coating interface glue on the surface layer of the first layer of prepreg, then laying a second layer of prepreg, reserving 100mm at the bottom of the second layer of prepreg, repeatedly compacting the second layer of prepreg to remove bubbles, and flattening the reserved 100mm long second layer of prepreg to the bottom of the floating disc bottom plate to remove the bubbles; as shown in fig. 1. When two layers of the prepreg of the light-cured glass fiber reinforced plastic material on the side wall of the floating disc are laid, the joints of the two layers are laid in a staggered mode, and interface glue is coated at the cutting opening of the prepreg of the light-cured glass fiber reinforced plastic material.
(4) And (3) construction of the bottom plate: after the construction of the side wall in the step (3) is finished, constructing a bottom plate of the carbon steel floating plate, laying two layers of prepreg of the light-cured glass fiber reinforced plastic material on the bottom plate like the side wall, coating interface glue on the part of the surface of the bottom plate needing construction, laying a first layer of prepreg, repeatedly compacting and removing bubbles; then coating interface glue on the surface layer of the first layer of prepreg, laying the second layer of prepreg, repeatedly compacting and removing bubbles; and laying two layers of prepreg until the outer edge is flush with the outer edge of the floating plate. When two layers of the prepreg of the light-cured glass fiber reinforced plastic material of the bottom plate of the floating disc are laid, the joints of the two layers are laid in a staggered mode, and interface glue is coated at the cutting opening of the prepreg of the light-cured glass fiber reinforced plastic material.
(5) And (3) photocuring treatment: after the construction of the through hole, the side wall and the bottom plate of the carbon steel floating plate is finished, carrying out photocuring treatment, wherein the photocuring adopts a special dual-band ultraviolet curing lamp, the power is 100W-200W, the power supply is a 12V direct-current power supply, and the photocuring time is 30 minutes; when the side wall and the bottom plate are photocured, the special dual-band ultraviolet curing lamp is rectangular, and when the through hole is photocured, the special dual-band ultraviolet curing lamp is cylindrical (the diameter is 40 mm); the special dual-waveband ultraviolet curing lamp is laid with the longitudinal distance of 20cm and the transverse distance of 30 cm.
(6) Detecting air bubbles and paving quality: after the construction of the side wall and the bottom plate of the floating plate is finished, whether the bubble protection slope is delaminated is checked, the slope can be tapped by taking an elbow of an iron wire or a small wooden hammer, if the slope is crisp, the indication is good, and if the shell is sounded, the phenomenon of bubble and delamination occurs; if delamination defects are found, repairing; if the number of the bubbles with the diameter less than 0.5cm is less than 3 per square meter, local repair can be carried out, otherwise, the bubbles are required to be scratched to add the repair prepreg; the quality requirement of laying the prepreg of the light-cured glass fiber reinforced plastic material is that the prepreg has no quality defects such as bubbles, delaminations, bubbles and the like; secondly, the color of the prepreg is uniform, white spots and white stubbles cannot appear, the whole surface of the glass fiber reinforced plastic is in the color of semitransparent glue stock, and obvious defects such as cracks, shadows and the like cannot be caused.
(7) Coating a conductive layer: mixing 99.48 mass percent of 470 common resin, 0.5 mass percent of pre-accelerator (6 mass percent of cobalt naphthenate) and 0.02 mass percent of inhibitor (acetylacetone), wherein the mixing time is not less than 3 hours, and obtaining the pre-accelerator resin after the mixing is finished; mixing 83% of pre-accelerating resin, 15% of graphite (800 meshes) and 2% of curing agent (925H curing agent) in percentage by mass to obtain conductive resin; and coating the obtained conductive resin on the side wall and the bottom plate of the carbon steel floating plate so as to cover a second layer of prepreg, wherein the conductive resin forms a conductive layer (the thickness is 0.5-0.6mm), and the novel composite carbon steel floating plate is obtained after the conductive layer is coated.
Example 2:
a novel composite carbon steel floating disc is prepared by the preparation method of the embodiment 1:
the inner wall of a through hole 1 of the floating disc main body is sequentially coated and/or paved with a special primer layer A4 and a prepreg layer 5 made of light-cured glass fiber reinforced plastic material from inside to outside, the tail end of the through hole and the surface layer of the bottom plate are adhered with an annular reinforcing ring 6, and the inner circle of the reinforcing ring is right opposite to the inner diameter of the through hole; the specially-made primer layer, the prepreg layer of the photocuring glass fiber reinforced plastic material and the reinforcing ring form an anti-corrosion layer of the through hole;
the side wall 2 and the bottom plate 3 of the floating plate main body are sequentially coated and/or paved with a special primer layer B7, a first layer of prepreg layer 8 made of light-cured glass fiber reinforced plastic material, a second layer of prepreg layer 9 made of light-cured glass fiber reinforced plastic material and a conductive layer 10 from inside to outside, and the special primer layer, the first layer of prepreg layer made of light-cured glass fiber reinforced plastic material, the second layer of prepreg layer made of light-cured glass fiber reinforced plastic material and the conductive layer form an anti-corrosion layer of the side wall and the bottom plate;
the thickness of the special primer layer A4 in the through hole is 60-70 μm; the thickness of the special primer layer B7 on the side wall and the bottom plate is 60-70 μm; the thickness of the conductive layer 10 is 0.5-0.6 mm;
the thickness of the prepreg layer 5 of the light-cured glass fiber reinforced plastic material in the through hole is 1.5 mm;
the thickness of the prepreg layer 8 of the first layer of the light-cured glass fiber reinforced plastic material on the side wall and the bottom plate is 1.5mm, and the thickness of the prepreg layer 9 of the second layer of the light-cured glass fiber reinforced plastic material is 1.5 mm;
the reinforcing ring 6 is made of prepreg of light-cured glass fiber reinforced plastic material and has the thickness of 1.5 mm; the diameter of the inner circle of the reinforcing ring is equal to that of the through hole, and the distance between the inner circle and the outer circle of the annular reinforcing ring is 200 mm.
The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A novel preparation method of a composite carbon steel floating plate is characterized in that a conventional carbon steel floating plate is manufactured in a floating roof oil tank according to a traditional method, and after the carbon steel floating plate is manufactured, the construction of photocuring glass fiber reinforced plastic materials is carried out on the immersion part of the carbon steel floating plate, and the preparation method comprises the following steps:
(1) pretreatment before construction: before construction, carrying out rust removal treatment on the carbon steel floating disc, and removing the rust on the bottom plate and the side wall of the carbon steel floating disc; then coating a layer of special primer on the bottom plate, the side wall and the inner surface of the through hole to be constructed of the carbon steel floating disc, so that the special primer is completely penetrated on the surface of the bottom plate, the surface of the side wall and the inner surface of the through hole; after the special primer is dried completely, performing putty coating treatment on the surfaces of the bottom plate and the part with uneven side surfaces to smooth the surfaces of the bottom plate and the side walls;
(2) constructing a through hole: the through hole on the carbon steel floating disc comprises a manhole, a guide post hole and a floating disc support leg hole, and after the pretreatment in the step (1) is completed, the through hole is constructed: firstly, cutting a prepreg of a light-cured glass fiber reinforced plastic material into a rectangle with the length slightly larger than the perimeter of the through hole and the width 150mm larger than the immersion depth of a floating disc according to the perimeter of the through hole; then coating interface glue on the special primer on the inner wall surface of the through hole; then laying the cut rectangular prepreg into the through hole, reserving 50mm at the bottom, and repeatedly pressing the prepreg and the inner wall of the through hole by using a compression roller to ensure that the prepreg and the inner wall of the through hole are firmly pressed; flattening the inner part of the through hole, and flattening the prepreg with the length of 50mm reserved at the bottom to the bottom of the floating disc bottom plate; finally, cutting the prepreg of the light-cured glass fiber reinforced plastic material into an annular reinforcing ring, wherein the diameter of the inner circle of the reinforcing ring is equal to and opposite to the diameter of the through hole, the distance between the inner circle and the outer circle of the reinforcing ring is 200mm, coating interface glue during construction, laying the prepreg, pressing by using a press roller, and rolling off bubbles;
(3) construction of the side wall: after the construction of the through hole in the step (2) is finished, constructing the side wall of the carbon steel floating plate, cutting the prepreg of the light-cured glass fiber reinforced plastic material into a rectangle, wherein the width of the first layer of prepreg is 100mm larger than the immersion depth of the floating plate, and the width of the second layer of prepreg is 200mm larger than the immersion depth of the floating plate; coating interface glue on a part, needing construction, of the side wall of the floating disc, then laying a first layer of prepreg, reserving 50mm at the bottom of the first layer of prepreg, repeatedly pressing the first layer of prepreg and the surface of the side wall to remove bubbles, and flattening the reserved first layer of prepreg with the length of 50mm to the bottom of the bottom plate of the floating disc to remove the bubbles; coating interface glue on the surface layer of the first layer of prepreg, then laying a second layer of prepreg, reserving 100mm at the bottom of the second layer of prepreg, repeatedly compacting the second layer of prepreg to remove bubbles, and flattening the reserved 100mm long second layer of prepreg to the bottom of the floating disc bottom plate to remove the bubbles;
(4) and (3) construction of the bottom plate: after the construction of the side wall in the step (3) is finished, constructing a bottom plate of the carbon steel floating plate, laying two layers of prepreg of the light-cured glass fiber reinforced plastic material on the bottom plate like the side wall, coating interface glue on the part of the surface of the bottom plate needing construction, laying a first layer of prepreg, repeatedly compacting and removing bubbles; then coating interface glue on the surface layer of the first layer of prepreg, laying the second layer of prepreg, repeatedly compacting and removing bubbles; laying two layers of prepreg until the outer edge is flush with the outer edge of the floating plate; when laying the prepreg, laying the lap joint gaps of the two layers in a staggered manner;
(5) and (3) photocuring treatment: after the construction of the through hole, the side wall and the bottom plate of the carbon steel floating plate is finished, carrying out photocuring treatment, wherein the photocuring adopts a special dual-waveband ultraviolet curing lamp, and the photocuring time is 30 minutes;
(6) detecting air bubbles and paving quality: after the photocuring construction in the step (5) is finished, detecting whether bubbles exist in the through hole, the side wall and the bottom plate of the carbon steel floating plate or not or whether bubbles fall off or not; if the film falls off, repairing; if bubbles exist, if the number of the bubbles with the diameter less than 0.5cm is less than 3 per square meter, local repair can be carried out, otherwise, the bubbles need to be scratched, the interface glue is coated, then light is supplemented to cure the prepreg of the glass fiber reinforced plastic material, and meanwhile, the light curing treatment needs to be carried out again on the repaired position;
(7) coating a conductive layer: mixing 99.48% of resin, 0.5% of pre-accelerator and 0.02% of inhibitor in percentage by mass for not less than 3 hours to obtain pre-accelerated resin after mixing; mixing 83% of pre-accelerating resin, 15% of graphite and 2% of curing agent in percentage by mass to obtain conductive resin; and coating the obtained conductive resin on the side wall and the bottom plate of the carbon steel floating disc so as to cover a second layer of prepreg, forming a conductive layer by using the conductive resin, and coating the conductive layer to obtain the novel composite carbon steel floating disc.
2. The preparation method according to claim 1, wherein in the step (1), the special primer is a Asalan 8084 epoxy vinyl high-strength paint, and the thickness of the special primer is 50-80 μm when the special primer is coated; the putty comprises light-cured resin and common putty, the mass of the common putty is 1.5-2.5 times of that of the light-cured resin, the material of the light-cured resin is the same as that of the resin in the light-cured glass fiber reinforced plastic material, and the common putty is commercially available putty commonly used for wall surface leveling.
3. The method according to claim 1, wherein the prepreg of the light-cured glass fiber reinforced plastic material has a thickness of 1-2mm when the through-hole is formed in the step (2); during the side wall construction in the step (3), the thickness of the prepreg of the first layer of light-cured glass fiber reinforced plastic material and the thickness of the prepreg of the second layer of light-cured glass fiber reinforced plastic material are both 1-1.5 mm; and (4) when the bottom plate is constructed in the step (4), the thickness of the prepreg of the first layer of light-cured glass fiber reinforced plastic material and the thickness of the prepreg of the second layer of light-cured glass fiber reinforced plastic material are 1-1.5 mm.
4. The preparation method according to claim 1, wherein in the step (3) and the step (4), when two layers of the prepreg of the light-cured glass fiber reinforced plastic material of the side wall and the bottom plate of the floating plate are laid, the joints of the two layers are laid in a staggered manner; interface glue is coated at the cutting opening of the prepreg of the light-cured glass fiber reinforced plastic material.
5. The method according to claim 1, wherein in step (5), the dedicated dual-band UV curing lamp has a power of 100W-200W and a power supply of 12V DC; when the side wall and the bottom plate are photocured, the special dual-band ultraviolet curing lamp is rectangular, and when the through hole is photocured, the special dual-band ultraviolet curing lamp is cylindrical; the special dual-waveband ultraviolet curing lamp is laid with the longitudinal distance of 20cm and the transverse distance of 30 cm.
6. The preparation method according to claim 1, wherein the prepreg of the light-cured glass fiber reinforced plastic material is a prepreg of a light-cured glass fiber reinforced plastic material with a chopped strand mat as a framework; the interface adhesive is light-cured resin, the material of the light-cured resin is the same as that of the resin in the light-cured glass fiber reinforced plastic material, and the coating thickness of the interface adhesive is 0.08-0.12 mm.
7. The method according to claim 1, wherein in the step (7), the resin is a non-light-curable resin, and the material of the resin is the same as that of the resin in the common glass fiber reinforced plastic material; the pre-accelerator is 6% of cobalt naphthenate; the inhibitor is acetylacetone; the graphite is 800 meshes of graphite; the curing agent is 925H curing agent; when the conductive resin is coated, the coating thickness is 0.5-0.6 mm.
8. A novel composite carbon steel floating plate prepared by the preparation method according to any one of claims 1 to 7, which is positioned in a floating roof tank (12), and comprises a floating plate body and an anti-corrosion layer on the floating plate body, and is characterized in that:
the inner wall of the through hole (1) of the floating plate main body is sequentially coated and/or paved with a special primer layer A (4) and a prepreg layer (5) of light-cured glass fiber reinforced plastic material from inside to outside, an annular reinforcing ring (6) is adhered to the tail end of the through hole and the surface layer of the bottom plate, and the inner circle of the reinforcing ring is just opposite to the inner diameter of the through hole; the specially-made primer layer, the prepreg layer of the photocuring glass fiber reinforced plastic material and the reinforcing ring form an anti-corrosion layer of the through hole;
the side wall (2) and the bottom plate (3) of the floating plate main body are sequentially coated and/or paved with a special primer layer B (7), a first layer of prepreg layer (8) made of light-cured glass fiber reinforced plastic material, a second layer of prepreg layer (9) made of light-cured glass fiber reinforced plastic material and a conductive layer (10) from inside to outside, and the special primer layer, the first layer of prepreg layer made of light-cured glass fiber reinforced plastic material, the second layer of prepreg layer made of light-cured glass fiber reinforced plastic material and the conductive layer form an anti-corrosion layer of the side wall and the bottom plate.
9. The novel composite carbon steel floating plate as claimed in claim 8, wherein: the thickness of the special primer layer A (4) in the through hole is 50-80 μm; the thickness of the special primer layer B (7) on the side wall and the bottom plate is 50-80 μm; the thickness of the conducting layer (10) is 0.5-0.6 mm.
10. The novel composite carbon steel floating plate as claimed in claim 8, wherein: the thickness of the prepreg layer (5) of the light-cured glass fiber reinforced plastic material in the through hole is 1-2 mm; the thickness of the prepreg layer (8) of the first layer of the light-cured glass fiber reinforced plastic material on the side wall and the bottom plate is 1-1.5mm, and the thickness of the prepreg layer (9) of the second layer of the light-cured glass fiber reinforced plastic material is 1-1.5 mm; the reinforcing ring (6) is made of prepreg of light-cured glass fiber reinforced plastic material and has the thickness of 1-2 mm; the diameter of the inner circle of the reinforcing ring is equal to that of the through hole, and the distance between the inner circle and the outer circle of the annular reinforcing ring is 200 mm.
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