CN109823708B - Steel member surface heavy-duty anti-corrosion sealing winding maintenance method - Google Patents
Steel member surface heavy-duty anti-corrosion sealing winding maintenance method Download PDFInfo
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- CN109823708B CN109823708B CN201910053494.2A CN201910053494A CN109823708B CN 109823708 B CN109823708 B CN 109823708B CN 201910053494 A CN201910053494 A CN 201910053494A CN 109823708 B CN109823708 B CN 109823708B
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Abstract
The invention discloses a steel member surface heavy-duty anticorrosion sealing wrapping maintenance method, which comprises the steps of firstly removing an original failed corrosion protection material of a base material, cleaning rusts and other pollutants on the surface of the base material, enabling the surface cleanliness to reach Sa2 level or the same degree, then brushing or blade coating a quick-drying type zinc-rich silane modified polymer sealant, blade coating a vulcanized type aluminum-rich silane modified polymer sealant, and finally wrapping a PVF adhesive tape; the method has the comprehensive characteristics of low surface treatment, corrosion inhibition and sealing, heat resistance, weather resistance and pollution resistance, is simple and quick in field operation, efficient, free of dead angle, good in sealing and wrapping appearance decoration, can provide a protection life of more than 20a for steel members working in special severe corrosion environments such as a heavy pollution chemical industry environment and an ocean tidal range area, fundamentally solves the economic loss caused by frequent maintenance in the fields of chemical plants, ocean engineering and the like, and avoids the risk of accidents and abnormal outage loss caused by corrosion of equipment or engineering.
Description
Technical Field
The invention relates to a steel structure surface corrosion protection technology, in particular to a steel structure surface heavy-duty anticorrosion sealing wrapping protection method, and belongs to the technical field of anticorrosion engineering.
Background
ISO 12944-2: 2017 corrosion protection of color paint and varnish-protective coating system on steel structure-part 2: environmental classification the corrosive environment is classified according to ISO9223 into 6 atmospheric environment corrosivity grades (C1, C2, C3, C4, C5, CX) and 4 structure soaking or burying corrosivity grades (Im 1, Im2, Im3 and Im 4), wherein industrial areas with extremely high humidity and aggressive atmosphere and offshore areas with high salinity belong to extreme corrosion grade CX, and the steel structures of metallurgical and petrochemical enterprises and marine engineering in real life are basically in the environment with very high corrosion grade C5 and extreme corrosion grade CX. Engineering practices show that under the environment with high corrosion level, the common paint heavy-duty anticorrosive coating system can only help the steel structure to resist a temporary corrosion (3-5 a), and in most cases, even about 1a, the steel structure needs to be maintained, so that the maintenance cost is greatly increased, the related operation of the engineering is also affected, and even safety accidents are caused.
For example, in a polysilicon production workshop, because of the air corrosion environment with high HCl content, steel structure equipment, facilities, even steel structure plants and pipelines in the workshop are seriously corroded, a conventional steel structure anticorrosion system is difficult to ensure the safe use of steel members, the outdoor pipeline facilities are maintained by adopting a glass fiber reinforced plastic coating technology, although the outdoor pipeline facilities are improved to a certain extent, the outdoor pipeline facilities only have a shielding effect, the potential hazards still exist, and the durability of the glass fiber reinforced plastic materials is poor.
The marine corrosion environment, particularly the tidal range region environment, the current steel pipe piles and steel structural members also meet the challenge of the extreme corrosion environment, and the authoritative survey shows that the steel bar corrosion serious damage can occur when 10-20 a is generally used in the harbor engineering built in 90 s in China, and the service life of the structure basically cannot meet the design requirement. According to statistics, the marine corrosion in China accounts for more than one tenth of the total corrosion loss in China, and at present, billions of yuan is lost every year.
For example, CN20147394 discloses a composite protective steel pile structure, wherein a steel pile substrate is sprayed with an anodic metal anticorrosive coating, an upper epoxy coating isolation layer is additionally arranged, and a glass fiber reinforced plastic protective layer is further wrapped on the surface of the steel pile substrate to form reliable protection for a steel structure in a tidal range region. However, engineering investigation shows that the technology of arc spraying zinc-aluminum and other active metal composite coatings in general corrosive environment has an initial maintenance-free life of 30a or even more than 50a, but the protective capability is obviously reduced in marine corrosive environment, mainly after a surface coating is attacked by corrosive media such as Cl-, active metal is excited, a zinc layer is lost, an aluminum layer is seriously pitting-corroded, the corrosive media invade and infiltrate into the metal coating and are driven in for a long time and spread rapidly, so that serious hidden troubles are caused to steel structure engineering, and the system is difficult to maintain and high in cost.
The multilayer coating anticorrosion technology is a novel anticorrosion technology appearing in recent years, a petrolatum antirust belt (Denso) is invented in 1925, a petrolatum antirust belt, a synthetic rubber sheath protection technology (Denso-EPT), a petrolatum antirust belt and a glass fiber reinforced plastic sheath protection technology (Denso-FRP) are developed in the later stage of seventies after the technology is introduced in the sixties of the last century in Japan, a PTC method anticorrosion new technology is formed in the early 80 years, anticorrosion paste and the anticorrosion belt are used as anticorrosion protection materials to be coated and wound on the surface of a steel facility, polyethylene foam and glass fiber reinforced plastic or a reinforced glass fiber reinforced plastic anticorrosion protection cover are used as an outer protection layer to coat the outer surface of the steel facility, a long-acting anticorrosion effect is achieved, and meanwhile, the outer glass fiber reinforced plastic protection cover can protect the anticorrosion belt, and a better protection effect is achieved. The related technologies are as follows: CN101078124 discloses a method for coating and preventing corrosion of steel materials installed in oceans, lakes, rivers, etc., which comprises coating a pasty mineral lipid corrosion-preventing material on the surface of the steel material, winding a belt-shaped mineral lipid corrosion-preventing tape thereon, and further coating the steel material with a protective cover and a cushion material made of a foam plastic material or rubber provided on the inner surface of the protective cover; CN105949890 discloses a coated transmission line network outdoor device and a preparation method thereof, wherein an oxidative polymerization type anticorrosion paste, anticorrosion daub, an anticorrosion belt and an oxidative polymerization type anticorrosion paste anticorrosion belt are adopted to form a comprehensive coated anticorrosion method; CN106967982 discloses a high-efficiency anticorrosion method for a supporting structure of a wind turbine generator in a wind farm in a marine environment, which is characterized in that a steel structure is sequentially subjected to surface treatment, anticorrosion paste is smeared, an anticorrosion tape is pasted, a protective cover is coated, and a coating gel-gel solution is composed of unsaturated polyester resin, an accelerator, a curing agent and pigment, so that high-efficiency anticorrosion is realized. The construction process of the PCT construction technology mainly comprises four steps: 1. surface treatment: shellfish, seaweed, plankton, rust and the like on the surface of the steel are removed, and the requirements of ISOSt2 standards are met. 2. Coating an anti-corrosion paste: uniformly smearing PTC special anti-corrosion paste on the surface of the steel structure. 3. Winding the corrosion-resistant belt: two layers of special PTC corrosion-resistant tapes are wound at the beginning and then sequentially stacked 1/2, so that more than 2 layers of corrosion-resistant tapes are covered at each position. 4. Fixing a protective cover: and (4) installing and fixing the protective cover on a steel structure facility, fastening the protective cover by using bolts, coating and sealing the two ends with the water-curing resin, and finishing construction. The technology is popularized and applied to obtain a good protection effect, but some problems exist, and the anti-corrosion paste body has certain fluidity and does not have bonding strength after being contacted with a matrix; the same is true of the corrosion-resistant belt, which is attached to the surface of the substrate only by the wrapping function, and the surface armor, sheath or polyester resin gel coat has durability that does not meet the protection requirement of the project 20a, and the field operator has high labor intensity and high cost, and the problems are more prominent when aiming at large-size members, large planes or special-shaped members.
Disclosure of Invention
Aiming at the development condition of the prior art and a plurality of technical problems thereof, the invention provides a steel member surface heavy-duty anticorrosion sealing wrapping maintenance method, which is characterized by comprising the following steps: the method comprises the following steps:
first step of substrate treatment
Firstly, removing an original failed corrosion protection structure of a steel member substrate, and then cleaning rusty materials and other pollutants on the surface of the steel member substrate in a manual or mechanical mode, wherein the surface cleanliness reaches grade Sa2 or the same degree;
second step of preparing inner sealing protective layer
After the surface of the steel member substrate is cleaned and dried, immediately brushing or blade-coating a layer of quick-drying zinc-rich silane modified polymer sealant, filling and scraping corrosion pits, defects and rough surfaces of the surface of the steel member substrate, which are caused by corrosion, to form an inner sealing protective layer, wherein the average thickness is 0.1-0.5 mm;
the third step is to prepare an external sealing protective layer
After the operation of the inner sealing protective layer is finished, coating a vulcanization type aluminum-rich silane modified polymer sealant on the inner sealing protective layer in 1-4h to form an outer sealing protective layer, wherein the average thickness is 0.5-2 mm;
the fourth step is to prepare a wrapping layer
After the outer sealing protective layer is formed, wrapping PVF adhesive tape for 4-8h to form a wrapping layer, wherein the thickness of the wrapping layer is 0.125-0.5 mm;
the quick-drying zinc-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 30-40 parts of high-activity silane modified polymer resin, 10-20 parts of non-alcohol plasticizer, 40-60 parts of flaky zinc powder, 0.5-1 part of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 2-4 parts of water removing agent, 0.1-1 part of alkaline assistant, 0.5-1 part of aminosilane adhesion promoter and 1-2 parts of organic tin catalyst;
the vulcanized aluminum-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 40-50 parts of silane modified polymer resin, 1-5 parts of non-floating flaky aluminum powder, 2-10 parts of floating flaky aluminum powder, 30-40 parts of nano calcium carbonate, 0.1-1 part of cellulose acetate butyrate, 0.5-2 parts of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 1-5 parts of dehydrator, 1-2 parts of epoxy silane and 0.5-2 parts of organic tin catalyst;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP; the high-activity silane modified polymer resin refers to trimethoxy terminated resin in silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP; the non-alcohol plasticizer is any one of diisononyl phthalate, dioctyl phthalate or diisodecyl phthalate; the alkaline auxiliary agent is one of or a mixture of any two of three solid powdery trisodium phosphate, sodium tripolyphosphate and sodium carbonate in any mass ratio;
the heat stabilizer is a BASF antioxidant Irganox 1010;
the water removing agent is vinyl trimethoxy silane;
the PVF adhesive tape wrapping layer is formed by tightly winding or sticking the PVF adhesive tape; the overlapping width of the PVF tape when spirally wound forward is 10-50% of the tape width.
The preparation method of the quick-drying zinc-rich silane modified polymer sealant comprises the following steps:
weighing the raw materials according to the weight parts of the quick-drying zinc-rich silane modified polymer sealant, and connecting N2The pipeline of the storage device slowly and continuously fills the clean and dry N into the clean and dry double-planet mixer kettle2Then, firstly, adding a non-alcohol plasticizer, then sequentially adding high-activity silane modified polymer resin, hydrophobic fumed silica, a heat stabilizer and a water removal agent accounting for 30-50% of the total weight, covering a double-planet stirrer, vacuumizing, and closing N2Valve, stirring and dispersing for 10-30min at the rotating speed of 50-100 rpm; gradually heating to 50-70 ℃, stirring at a high speed of 1500rpm at a rotation speed of 1000-; adding aminosilane, and stirring for 10-20min at the rotation speed of 200-300rpm and below 40 ℃ in vacuum; finally, discharging and hermetically packaging to obtain the quick-drying zinc-rich silane modified polymer sealant; in each operation process, as long as the stirrer kettle cover is opened and closed, N is added into the timely stirrer kettle2Protecting; the discharging and packaging process keeps vacuum and advances N2Filling the packaging container to remove air, and packaging the quick-drying zinc-rich silane modified polymer sealant and sealing reliably.
The preparation method of the vulcanized aluminum-rich silane modified polymer sealant comprises the following steps:
weighing the materials according to the weight parts of the vulcanized aluminum-rich silane modified polymer sealant, adding silane modified polymer resin into a clean and dry double-planet stirrer, then sequentially adding hydrophobic fumed silica, nano calcium carbonate, a heat stabilizer, cellulose acetate butyrate and a water removal agent accounting for 50-70% of the total weight, vacuumizing, and stirring and dispersing for 10-30min at a rotating speed of 50-100 rpm; gradually heating to 50-70 deg.C, stirring at 1000-; adding non-floating flake aluminum powder and floating flake aluminum powder, stirring at the rotation speed of 200-300rpm under vacuum at 40 ℃ for 30-60min, adding the rest of the water removing agent, and continuing stirring for 10-20 min; adding epoxy silane, and stirring at the rotation speed of 200-300rpm under vacuum at 40 ℃ for 10-20 min; finally adding an organic tin catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the vulcanized aluminum-rich silane modified polymer sealant for later use.
Aiming at the steel member in the sea tidal range area environment, the surface anticorrosion sealing winding maintenance method of the steel member substrate comprises the following steps:
first, substrate treatment
Before the tide rises to a high position, the original ineffective corrosion protection structure of the steel structure matrix is removed, rusty substances, slag inclusion, marine organisms or moss on the surface of the steel structure matrix are cleaned by high-pressure fresh water, sand blasting or manual polishing, the surface cleanliness of the steel structure matrix reaches grade Sa2 or the same grade, and the upper part and the lower part of the steel structure matrix within the treatment range are both beyond 200mm of the designed construction line range;
after the tide falls, the exposed surface of the steel structure substrate is treated in the same way with the tide, and the subsequent operation is not influenced by the splash of the steel structure surface in the treatment process or after the treatment;
when the steel structure matrix is treated, the treatment is carried out from the atmosphere zone, the splash zone and the tidal range zone from top to bottom along the surface of the steel structure matrix, and the treatment is carried out on the surface of the steel structure matrix in the tidal range zone from the tidal water rising tide to the highest line to the tidal water falling tide to the lowest line in time;
second, preparing an inner sealing protective layer
Measuring the surface water content of the processed steel member substrate, when the water content is more than 6%, drying and blowing the surface of the steel member substrate by using a hot air blower, when the water content is reduced to below 6%, immediately brushing or blade-coating a layer of quick-drying zinc-rich silane modified polymer sealant to form an inner sealing protective layer, filling and scraping corrosion pits, defects and rough surfaces on the surface of the steel member substrate, which are caused by corrosion, to be flat, wherein the average thickness of the inner sealing protective layer is 0.1-0.5 mm;
when tidal water rises or the operation time is limited, the inner sealing protective layer is manufactured upwards from a position close to the water surface, namely, the area closer to the sea level is scraped first and is coated;
thirdly, preparing an external sealing protective layer
After the operation of the inner sealing protective layer is finished, coating a vulcanization type aluminum-rich silane modified polymer sealant on the inner sealing protective layer in 1-2h to form an outer sealing protective layer with the average thickness of 0.5-2 mm;
when tidal water rises or the operation time is limited, the outer sealing protective layer can be prepared by following the formation of the operation surface of the inner sealing protective layer, so that more standing time can be reserved after the outer sealing protective layer is prepared;
the fourth step is to prepare a wrapping layer
After the outer sealing protective layer is formed, wrapping PVF adhesive tape for 4-5h to form a wrapping layer, wherein the thickness of the wrapping layer is 0.125-0.5 mm;
when the tide rises or the operation time is limited, immediately performing PVF adhesive tape wrapping operation along the upward direction from the water surface or the designed lower limit position before the tide rises again to reach the designed wrapping position for at least 10 min; reserving at least 200mm of sealing adhesive layers at the lower parts of the PVF adhesive tapes, wrapping the PVF adhesive tapes with the steel member matrix twice along the horizontal position, then spirally wrapping the PVF adhesive tapes upwards along the steel member matrix, and overlapping adjacent PVF adhesive tapes according to 30-50%; when the steel member is wrapped to the upper part and the end is closed, wrapping the steel member substrate twice along the horizontal position of the upper part, and lapping and transiting the steel member substrate with the surface of the upper steel member substrate; the lap joint position of the upper wrapping bag should exceed the splash zone or the highest tide zone of astronomical tide;
when the surface of the special-shaped steel member base body is wrapped, the PVF adhesive tape is tensioned while the PVF adhesive tape is pressed against the contact part of the PVF adhesive tape and the surface of the special-shaped steel member base body, the adhesive wrapping tape is continuously pressed forwards, and the pressed adhesive part is repeatedly pressed and compacted by a pressing roller tool;
when the PVF adhesive tape is wound, cleaning work of the bonding surface is timely done, and the bonding quality cannot be influenced by water drops, water marks and water mist;
the quick-drying zinc-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 30-40 parts of high-activity silane modified polymer resin, 10-20 parts of non-alcohol plasticizer, 40-60 parts of flaky zinc powder, 0.5-1 part of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 2-4 parts of water removing agent, 0.1-1 part of alkaline assistant, 0.5-1 part of aminosilane adhesion promoter and 1-2 parts of organic tin catalyst;
the vulcanized aluminum-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 40-50 parts of silane modified polymer resin, 1-5 parts of non-floating flaky aluminum powder, 2-10 parts of floating flaky aluminum powder, 30-40 parts of nano calcium carbonate, 0.1-1 part of cellulose acetate butyrate, 0.5-2 parts of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 1-5 parts of dehydrator, 1-2 parts of epoxy silane and 0.5-2 parts of organic tin catalyst;
the high-activity silane modified polymer resin refers to trimethoxy terminated resin in silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the non-alcohol plasticizer is any one of diisononyl phthalate, dioctyl phthalate or diisodecyl phthalate;
the alkaline auxiliary agent is one of or a mixture of any two of three solid powdery trisodium phosphate, sodium tripolyphosphate and sodium carbonate in any mass ratio;
the heat stabilizer is a BASF antioxidant Irganox 1010;
the water removing agent is vinyl trimethoxy silane.
The invention relates to an optimization scheme of a steel member surface heavy-duty anti-corrosion sealing winding maintenance method, which comprises the following steps: when the surface of the steel member is subjected to anticorrosion sealing wrapping operation, the wrapped surface of the defect position where the PVF adhesive tape is accidentally damaged, the joint is warped, bubbled or bulged, the adhesive surface is wet, other poor adhesion or the adhesion effect does not meet the design requirement can be subjected to secondary wrapping or pasting of the PVF adhesive tape after the wrapped surface of the defect position is finished or flattened, and the surface is compacted by a press roll;
and the outer layer of the secondary wrapping PVF adhesive tape is wrapped or stuck to the position outside the defect edge by at least 50mm, and when the secondary wrapping PVF adhesive tape is wrapped or stuck with the PVF adhesive tape, the superposition of the adjacent adhesive tapes is not less than 50%.
In addition, according to the self structure condition and the working condition of the steel member, when the PVF tape wrapping operation is difficult to conveniently and reliably carry out, the weather-resistant finish paint can be brushed or sprayed on the surface of the vulcanization type aluminum-rich silane modified sealing adhesive layer, namely the outer sealing protective layer, and the weather-resistant finish paint is excellent in high-performance weather-resistant finish paint such as fluorocarbon, polysiloxane, acrylic polyurethane and the like. The coating can be sprayed for 2 times or more than 2 times, and the thickness of the weather-resistant finish coat is not less than 70 mu m.
The invention can be used for the maintenance treatment of the surfaces of steel structures such as steel piles, steel pipe piles and the like used in internal equipment, pipelines, pipe fittings, workshop steel structures of chemical plants, various steel structure projects at sea, near sea and coastal areas, ports, wharfs, cross-sea bridges, offshore wind power, offshore drilling platforms and the like in tidal range.
The prior art shows that the silane modified polymer sealant adopts low-temperature chemical dehydration, so that the energy consumption for preparing the product can be greatly reduced, but side effects are brought, such as reduced performance, low stability and the like of the sealed product; the existing research results also show that when the pH value of the organosilicon sealant system is alkaline (pH is more than 7), the vulcanization speed is obviously slowed, and the mechanical property is reduced. In order to ensure the stability of simple substance zinc and prevent the simple substance zinc from reacting with other coating components, the existing zinc-rich coating generally adopts a multi-component design, and only mixes and disperses zinc powder and other coating components on site when in use. Due to the fact that the viscosity of the sealant product is high, a professional dispersing device needs to be configured on the site of use by adopting a multi-component design, and the difficulty of uniform dispersion is high. In addition, the corrosion environment under the heavy-duty corrosion-resistant environment is extremely severe, the pollution to a working interface is large, and the maintenance operation is required to be completed quickly and reliably. Aiming at the technical situation and the quality influence problem, the invention adopts the quick-drying zinc-rich silane modified polymer sealant to realize the sealing, filling and protection of the processing substrate, and simultaneously, the outer sealing protective layer can also be quickly constructed, thereby ensuring the quick realization of the whole sealing and wrapping protective structure. The quick-drying zinc-rich silane modified polymer sealant selects trimethoxy terminated silane modified polymer resin to ensure that the surface drying and vulcanization of a system are quickly realized; non-alcohol plasticizers are used in the formula components to eliminate the potential damage of the alcohol plasticizers to the zinc flake powder in the prior art; in addition, the addition of an alkaline assistant compatible with the whole system is preferable to inhibit the situation that the active hydroxyl exists in the form of alcohol when the pH value and the chemical dehydration of the sealant system resin are carried out; the adhesion promoter also selects aminosilane, and the comprehensive design is carried out to improve the stability of the simple substance zinc in the zinc powder and the quality stability of the quick-drying zinc-rich silane modified polymer sealant product. The quick-drying zinc-rich silane modified polymer sealant has good heat resistance, and the continuous 14d test at 120 ℃ shows that the appearance of the adhesive layer is unchanged and the mechanical property attenuation is less than 25%.
The sulfuration type aluminum-rich silane modified polymer sealant selects floating flaky aluminum powder, can utilize the floating and floating properties of the floating flaky aluminum powder after the sealant is coated by blade, improves the parallel arrangement effect of the flaky aluminum by the promotion effect of cellulose acetate butyrate, forms good shielding property, and can further improve the adhesion and durability of the flaky aluminum on the surface of the sealant by aggregation of the flaky aluminum on the surface of the sealant; the non-floating flaky aluminum powder is simultaneously selected in the system, so that the conductivity and the shielding property in the sealant are improved, the non-floating flaky aluminum powder and the metal zinc in the quick-drying zinc-rich silane modified polymer sealant of the inner sealing protective layer form conductive integrity to cooperatively protect a steel component substrate, and meanwhile, the metal aluminum with higher activity is selected in the outer sealing protective layer, so that the protective effect of aluminum on zinc can be exerted when a corrosive medium erodes to the inner sealing protective layer. The vulcanized aluminum-rich silane modified polymer sealant does not use any plasticizer, not only thoroughly solves the problem that the pressure-sensitive adhesive of the PVF adhesive tape falls off on the sealant coating, but also can ensure that the wrapping operation can be carried out 1h after the sealant of the outer sealing protective layer is coated by blade, ensures the adhesiveness of the PVF adhesive tape and the sealant layer, greatly improves the engineering construction efficiency, and also eliminates construction and quality problems of interface pollution, interlayer adhesion failure and the like caused by long-time exposure and dust absorption pollution. The vulcanized type aluminum-rich silane modified polymer sealant has good heat resistance, and the continuous 14d test at 120 ℃ shows that the appearance of the adhesive layer is unchanged and the mechanical property attenuation is less than 25%.
The PVF adhesive tape is a polyvinyl fluoride film adhesive tape, the tape is formed by extruding a copolymer of fluorine and fluorocarbon molecules, and has a crystal structure, high electric insulation performance, high toughness, excellent chemical resistance, ageing resistance and corrosion resistance, the resistance and durability of the PVF film to sunlight, chemical solvents, acid-base corrosion, moisture and oxidation are obviously improved, and the PVF adhesive tape can be kept stable for a long time in an environment of-40 ℃ to 90 ℃. However, when the existing PVF adhesive tape is wound on the surface of a conventional sealant layer, the pressure-sensitive adhesive can be separated from the PVF film, and the peel strength of the adhesive tape is also obviously reduced. Aiming at the problems found in the PVF adhesive tape, the vulcanized aluminum-rich silane modified polymer sealant abandons the use of a plasticizer, selects floating flaky aluminum powder, and can utilize the floating and floating properties of the floating flaky aluminum powder after the sealant is coated by blade, and improves the parallel arrangement effect of the flaky aluminum by the promotion action of cellulose acetate butyrate to form good shielding property, and the adhesion and durability of the flaky aluminum on the surface of the sealant can be further improved by aggregation of the flaky aluminum on the surface of the sealant.
The invention has the beneficial effects that:
the heavy-duty anticorrosion sealing wrapping maintenance method adopts a quick-drying zinc-rich silane modified polymer sealant containing high-content flaky zinc powder, a vulcanized aluminum-rich silane modified polymer sealant matched with a floating aluminum sheet and a non-floating aluminum sheet, and a PVF adhesive tape, all structural layers are tightly and coordinately combined, the shielding property and the weather resistance are obviously improved, the whole system can continuously and reliably work for a long time at the temperature of-40-90 ℃, the thermal working environment requirements of equipment operation heating, outdoor exposure heat transfer and a thermal medium transmission pipeline in a general chemical plant are met, and the anode protection, shielding, sealing and PVF wrapping performance are stable and reliable.
The whole maintenance method can realize the service life of the initial maintenance above 20a and even exceeding 30 a; the structure process is simple, efficient, green and environment-friendly, the product excellent performance and the construction convenience of the PVF adhesive tape are fully exerted, the later maintenance is basically not needed, the maintenance cost is obviously saved, and the economic and social benefits of the operation of steel members are greatly improved.
The quick-drying zinc-rich silane modified polymer sealant disclosed by the invention does not contain a filler, the content of flaky zinc powder is obviously improved, the anode protection and corrosion medium shielding capability of the sealant is greatly enhanced, a non-alcohol plasticizer is selected as a system, an alkaline assistant is added, and aminosilane is used, so that the stability of the flaky zinc powder in the sealant is effectively protected through the comprehensive improvement, and the technical problems of side effects caused by low-temperature chemical dehydration, instability in product storage of the zinc powder and the like in the prior art are solved. The invention adopts the flaky zinc powder with high content, strong anode protection effect and quick drying and quick coating, and the prior steel component matrix only needs low surface treatment, thereby greatly reducing the operation intensity and the surface cleaning difficulty and the maintaining difficulty under the high-corrosion environment.
According to the vulcanized aluminum-rich silane modified polymer sealant, floating flaky aluminum powder is selected and coated on the sealant, and the floating and floating properties of the sealant can be utilized, so that the parallel arrangement effect of the flaky aluminum is improved by means of CAB promotion, and good shielding property is formed; the adhesion and the durability of the sealant surface sheet with the PVF adhesive tape are further improved by the aluminum aggregation of the sealant surface sheet; non-floating flaky aluminum powder is simultaneously selected in the system, the cost of the sealant is controlled, the good conductivity of the sealant is ensured, the conductive integration of metal aluminum in the outer sealing protective layer and metal zinc in the quick-drying zinc-rich silane modified sealant of the inner sealing protective layer is realized, and a steel component substrate is cooperatively protected; the outer sealing protective layer is made of metal aluminum with higher activity, and the protective effect of aluminum on zinc can be exerted when a corrosive medium erodes the inner sealing protective layer. The vulcanized aluminum-rich silane modified polymer sealant does not use any plasticizer, thoroughly solves the problem of pressure-sensitive adhesive falling off of a PVF adhesive tape on a sealant coating, can carry out wrapping operation 1h after the sealant of an external sealing protective layer is coated, and does not influence the adhesiveness of the PVF adhesive tape and the sealant layer, thereby greatly improving the engineering construction efficiency, and solving the construction and quality problems of interface pollution, interlayer adhesion failure and the like caused by dust absorption pollution due to long-time exposure before wrapping or coating of the existing external sealing protective layer.
Aiming at special working conditions of a tidal range area, the comprehensive maintenance process can realize quick construction, complete the whole sealing, winding and packaging maintenance operation within one tidal range time, ensure the quality of the maintenance operation and obviously reduce the maintenance cost.
The maintenance structure has the advantages that the preparation process is convenient, energy-saving and reliable, the whole structure has excellent sealing shielding anode protection performance, and the durable protection of the steel member in a severe corrosion environment is realized; the whole technology is green, clean and environment-friendly, has low manufacturing cost, obvious energy-saving and consumption-reducing effects, obvious economic and social benefits and good engineering application prospect.
Drawings
FIG. 1 is a schematic structural view of the steel member surface heavy duty seal wrap maintenance method of the present invention;
in the figure: 1-steel component substrate, 2-inner sealing protective layer, 3-outer sealing protective layer and 4-wrapping layer.
Detailed Description
The scheme and the effect of the invention are further illustrated by the following examples:
examples 1 to 2
Preparation of a quick-drying zinc-rich silane-modified Polymer sealant the raw material composition and parts by weight of the quick-drying zinc-rich silane-modified polymer sealant of examples 1-2 are shown in Table 1, wherein SAX510 is a Japanese Korea trimethoxy terminated silane-modified polymer resin, and STP, SPUR trimethoxy terminated silane-modified polymer resin belongs to a PH slightly basic resin, and the amount of basic additives can be reduced accordingly.
Table 1 examples 1-2 each raw material composition and parts by weight unit: parts by weight
Weighing the raw materials according to the weight parts of the materials in the table 1, and connecting N2The pipeline of the storage device slowly and continuously fills the clean and dry N into the clean and dry double-planet mixer kettle2Then, firstly, adding a non-alcohol plasticizer, then sequentially adding high-activity silane modified polymer resin, hydrophobic fumed silica, a heat stabilizer and a water removal agent accounting for 30-50% of the total weight, covering a double-planet stirrer, vacuumizing, and closing N2Valve, stirring and dispersing for 10-30min at the rotating speed of 50-100 rpm; gradual heatingStirring at high speed of 1500rpm at the rotation speed of 1000-; adding aminosilane, and stirring for 10-20min at the rotation speed of 200-300rpm and below 40 ℃ in vacuum; finally, discharging and hermetically packaging to obtain the quick-drying zinc-rich silane modified polymer sealant; in each operation process, as long as the stirrer kettle cover is opened and closed, N is added into the timely stirrer kettle2Protecting; the discharging and packaging process keeps vacuum and advances N2Filling the sealant into a packaging container to remove air, and packaging the quick-drying zinc-rich silane modified polymer sealant, wherein the sealant is reliably sealed for later use.
Table 2 shows the data obtained in examples 1 to 2
Table 2 shows the comparison of the vulcanization performance, zinc content and zinc content after 6 months of the quick-drying type zinc-rich silane modified polymer sealant in the examples 1-2 and the existing non-drying sealing putty, non-zinc sulfide powder paste and slow-vulcanization sealing paste, and test results show that the performance of the quick-drying type zinc-rich silane modified polymer sealant meets the technical requirements of the existing industry standard, is heat-resistant and reliable, meets the requirements of chemical equipment on heat generation due to operation and the working conditions of a general pipeline thermal medium chemical pipeline, maintains the anode protection and shielding capability of the stabilizer for a long time, and has outstanding comprehensive performance by comparison with the existing similar products.
The surface-dry rapid simple substance zinc content of the invention is only slightly reduced by 1-2% after 6 months of storage, and the storage stability is good, while the existing non-zinc sulfide powder paste is reduced by more than 40%, and the paste is obviously aerated after being initially packaged and stored for 6 months in vacuum, and the test result shows that the invention achieves the expected effect.
Examples 3 to 5
Preparation of vulcanizable, aluminum-rich silane-modified polymeric sealants, the raw material compositions and parts by weight of the vulcanizable, aluminum-rich silane-modified polymeric sealants of examples 3-5 are shown in Table 3.
Table 3 examples 3-5 each material composition and parts by weight unit: parts by weight
Weighing the materials according to the weight parts of the vulcanized aluminum-rich silane modified polymer sealant material in the table 3, putting silane modified polymer resin into a clean and dry double-planet stirrer, sequentially adding hydrophobic fumed silica, nano calcium carbonate, cellulose acetate butyrate, a heat stabilizer 1010 and 50-70 wt% of vinyl trimethoxy silane, vacuumizing, and stirring and dispersing at the rotating speed of 50-100rpm for 10-30 min; then gradually heating to 50-70 ℃, stirring at a high speed of 1000-1500rpm for 30-90min until the sealant paste is fine and uniform, and cooling to below 40 ℃; then adding non-floating flake aluminum powder and floating flake aluminum powder, stirring for 30-60min at the rotating speed of 200-300rpm under vacuum at the temperature of 40 ℃, then adding the rest vinyl trimethoxy silane, continuously stirring for 10-20min at the rotating speed of 200-300rpm under vacuum at the temperature of 40 ℃, then adding epoxy silane, and stirring for 10-20min at the rotating speed of 200-300rpm under vacuum at the temperature of 40 ℃; finally adding a catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the vulcanized aluminum-rich silane modified polymer sealant for later use.
As can be seen from the test and comparison data in Table 3, the expected effect of the design of the invention is realized in examples 3-5, the comprehensive performance meets the requirements of the prior industry technical specification, the heat resistance is good, the PVF adhesive tape is well matched with the embodiments, the durable tolerance is realized, and the potential incompatibility problem of the prior sealant and the pressure-sensitive adhesive of the PVF adhesive tape is solved.
Example 6
As shown in FIG. 1, the maintenance method of the heavy-duty sealed package on the surface of the steel member of a certain petrochemical plant comprises the following specific steps:
first step of substrate treatment
Firstly, removing the paint heavy anti-corrosion coating which is originally failed, peeled and fallen off on the steel member substrate 1, manually polishing and cleaning the rust and other pollutants on the surface of the steel member substrate, wherein the surface cleanliness reaches St3 level.
Second step of preparing inner sealing protective layer
After the surface of the base body is cleaned and dried, a layer of quick-drying zinc-rich silane modified polymer sealant in the embodiment 1 is immediately blade-coated, and corrosion pits, defects and rough surfaces of the surface of the base body 1 of the steel member, which are caused by corrosion, are filled and scraped to form an inner sealing protective layer 2, wherein the average thickness is about 0.1-0.5 mm.
The third step is to prepare an external sealing protective layer
And after the operation of the inner sealing protective layer 2 is finished, standing for 1h, and blade-coating the vulcanized aluminum-rich silane modified polymer sealant prepared in the embodiment 3 on the inner sealing protective layer 2 to form an outer sealing protective layer 3 with the average thickness of 0.5-2 mm.
The fourth step is to prepare a wrapping layer
After the outer sealing protective layer 3 is sealed, standing for 4 hours, wrapping the PVF tape to form a wrapping layer 4, wherein the PVF tape is a DuPont product, the thickness of the PVF tape is 0.125mm, the adjacent part of the wrapping layer 4 is overlapped by 10%, and the thickness is about 0.125 mm.
Step 5 local repair
PVF adhesive tapes are cut and pasted at corresponding positions on the outer surface of the outer sealing protective layer 3 at gaps, dead corners and the like of equipment and pipelines which are difficult to effectively wrap PVF, and are pasted and compacted; the overlapping width of the adhesive tapes at the adjacent joints of the PVF adhesive tapes should exceed 50mm
The special parts can not be repaired by PVF adhesive tape, 2 channels of fluorocarbon finish are brushed on the surface of the special parts, the color of the finish is white, the special parts are consistent with the wrapped PVF adhesive tape, and the total thickness of the weather-resistant finish coating is about 80 mu m.
Example 7
The surface anticorrosion sealing winding maintenance method of the steel pipe pile of a certain harbor wharf comprises the following steps:
first step, pile body treatment
Before the tide water rises to a high level, the original failed heavy anti-corrosion coating on the surface of the steel pipe pile (which is a steel component substrate) is removed, a test polishing machine is used for polishing to remove rust, local marine organisms, moss and the like on the surface of the steel pipe pile, the surface cleanliness reaches St3 level, the lower level is treated to be close to a low tide level, and the range of the lower level exceeds the range of a designed construction line by about 300 mm.
Second, preparing an inner sealing protective layer
And measuring the surface water content of the polished steel pipe pile to be less than 1%, immediately coating the quick-drying zinc-rich silane modified polymer sealant prepared in the example 2, filling and scraping the surface of the steel member due to uneven pits, modifying and rounding, and enabling the average thickness of the inner sealing protective layer to be 0.2-0.4 mm.
Thirdly, preparing an external sealing protective layer
And after the operation of the inner sealing protective layer is finished, standing for about 1h, coating the vulcanized aluminum-rich silane modified polymer sealant prepared in the embodiment 4 on the inner sealing protective layer in a blade coating manner, and finishing the surface sealing adhesive layer of the steel pile to form the outer sealing protective layer, wherein the average thickness is 0.5-1 mm.
The fourth step is to prepare a wrapping layer
And after the outer sealing protective layer is formed, standing for about 4 hours, wrapping the DuPont PVF adhesive tape in a spiral direction from the position close to the water surface, horizontally wrapping 3 times at the initial position, then overlapping 50% of the adjacent adhesive tapes in the spiral direction to form a wrapping layer, and ending after 3 times of horizontal wrapping of the designed thread, wherein the thickness of the wrapping layer is about 0.25 mm.
Claims (6)
1. The steel member surface heavy-duty anticorrosion sealing winding maintenance method is characterized by comprising the following steps of: the method comprises the following steps:
first step of substrate treatment
Firstly, removing an original failed corrosion protection structure of a steel member substrate, and then cleaning rusty materials and other pollutants on the surface of the steel member substrate in a manual or mechanical mode, wherein the surface cleanliness reaches grade Sa2 or the same degree;
second step of preparing inner sealing protective layer
After the surface of the steel member substrate is cleaned and dried, immediately brushing or blade-coating a layer of quick-drying zinc-rich silane modified polymer sealant, filling and scraping corrosion pits, defects and rough surfaces of the surface of the steel member substrate, which are caused by corrosion, to form an inner sealing protective layer, wherein the average thickness is 0.1-0.5 mm;
the third step is to prepare an external sealing protective layer
After the operation of the inner sealing protective layer is finished, coating a vulcanization type aluminum-rich silane modified polymer sealant on the inner sealing protective layer in 1-4h to form an outer sealing protective layer, wherein the average thickness is 0.5-2 mm;
the fourth step is to prepare a wrapping layer
After the outer sealing protective layer is formed, wrapping PVF adhesive tape for 4-8h to form a wrapping layer, wherein the thickness of the wrapping layer is 0.125-0.5 mm;
the quick-drying zinc-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 30-40 parts of high-activity silane modified polymer resin, 10-20 parts of non-alcohol plasticizer, 40-60 parts of flaky zinc powder, 0.5-1 part of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 2-4 parts of water removing agent, 0.1-1 part of alkaline assistant, 0.5-1 part of aminosilane adhesion promoter and 1-2 parts of organic tin catalyst;
the vulcanized aluminum-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 40-50 parts of silane modified polymer resin, 1-5 parts of non-floating flaky aluminum powder, 2-10 parts of floating flaky aluminum powder, 30-40 parts of nano calcium carbonate, 0.1-1 part of cellulose acetate butyrate, 0.5-2 parts of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 1-5 parts of dehydrator, 1-2 parts of epoxy silane and 0.5-2 parts of organic tin catalyst;
the high-activity silane modified polymer resin refers to trimethoxy terminated resin in silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the non-alcohol plasticizer is any one of diisononyl phthalate, dioctyl phthalate or diisodecyl phthalate;
the alkaline auxiliary agent is one of or a mixture of any two of three solid powdery trisodium phosphate, sodium tripolyphosphate and sodium carbonate in any mass ratio;
the heat stabilizer is a Basff antioxidant Zrganox 1010;
the water removing agent is vinyl trimethoxy silane;
the PVF tape wrapping layer is formed by winding or sticking the PVF tape; the overlapping width of the adjacent PVF adhesive tapes when the PVF adhesive tapes are spirally wound is 10-50% of the width of the PVF adhesive tapes.
2. The steel member surface heavy duty sealing wrap maintenance method of claim 1, characterized in that: the preparation method of the quick-drying zinc-rich silane modified polymer sealant comprises the following steps:
weighing the raw materials in the quick-drying zinc-rich silane modified polymer sealant in parts by weight, and connecting N2The pipeline of the storage device slowly and continuously fills the clean and dry N into the clean and dry double-planet mixer kettle2Then, firstly, adding a non-alcohol plasticizer, then sequentially adding high-activity silane modified polymer resin, hydrophobic fumed silica, a heat stabilizer and 30-50% of a water removing agent by weight, covering a double-planetary mixer, vacuumizing, and closing N2Valve, stirring and dispersing for 10-30min at the rotating speed of 50-100 rpm; gradually heating to 50-70 ℃, stirring at a high speed of 1500rpm at a rotation speed of 1000-; adding aminosilane, and stirring for 10-20min at the rotation speed of 200-300rpm and below 40 ℃ in vacuum; finally, discharging and hermetically packaging to obtain the quick-drying zinc-rich silane modified polymer sealant; in each operation process, as long as the stirrer kettle cover is opened and closed, N is added into the stirrer kettle in time2Protecting; the discharging and packaging process keeps vacuum and advances N2Filling the packaging container to remove air, and packaging the quick-drying zinc-rich silane modified polymer sealant and sealing reliably.
3. The steel member surface heavy duty sealing wrap maintenance method of claim 1, characterized in that: the preparation method of the vulcanized aluminum-rich silane modified polymer sealant comprises the following steps:
weighing the materials in the vulcanized aluminum-rich silane modified polymer sealant in parts by weight, firstly adding silane modified polymer resin into a clean and dry double-planet stirrer, then sequentially adding hydrophobic fumed silica, nano calcium carbonate, a heat stabilizer, cellulose acetate butyrate and 50-70% of a water removing agent in parts by weight, vacuumizing, and stirring and dispersing for 10-30min at a rotating speed of 50-100 rpm; gradually heating to 50-70 deg.C, stirring at 1000-; adding non-floating flake aluminum powder and floating flake aluminum powder, stirring at the rotation speed of 200-300rpm under vacuum at 40 ℃ for 30-60min, adding the rest of the water removing agent, and continuing stirring for 10-20 min; adding epoxy silane, and stirring at the rotation speed of 200-300rpm under vacuum at 40 ℃ for 10-20 min; finally adding an organic tin catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the vulcanized aluminum-rich silane modified polymer sealant for later use.
4. A steel member surface heavy duty seal wrap maintenance method as claimed in claim 1, characterized in that: when the steel member matrix is in the ocean tidal range area environment, the surface anticorrosion sealing winding maintenance method of the steel member matrix comprises the following steps:
first, substrate treatment
Before the tide rises to a high position, the original ineffective corrosion protection structure of the steel structure matrix is removed, rusty substances, slag inclusion, marine organisms or moss on the surface of the steel structure matrix are cleaned by high-pressure fresh water, sand blasting or manual polishing, the surface cleanliness of the steel structure matrix reaches grade Sa2 or the same grade, and the upper part and the lower part of the steel structure matrix within the treatment range are both beyond 200mm of the designed construction line range;
after the tide falls, the exposed surface of the steel structure substrate is treated in the same way with the tide, and the subsequent operation is not influenced by the splash of the steel structure surface in the treatment process or after the treatment;
when the steel structure matrix is treated, the treatment is carried out from the atmosphere zone, the splash zone and the tidal range zone from top to bottom along the surface of the steel structure matrix, and the treatment is carried out on the surface of the steel structure matrix in the tidal range zone from the tidal water rising tide to the highest line to the tidal water falling tide to the lowest line in time;
second, preparing an inner sealing protective layer
Measuring the surface water content of the processed steel member substrate, when the water content is more than 6%, drying and blowing the surface of the steel member substrate by using a hot air blower, when the water content is reduced to below 6%, immediately brushing or blade-coating a layer of quick-drying zinc-rich silane modified polymer sealant to form an inner sealing protective layer, filling and scraping corrosion pits, defects and rough surfaces on the surface of the steel member substrate, which are caused by corrosion, to be flat, wherein the average thickness of the inner sealing protective layer is 0.1-0.5 mm;
when tidal water rises or the operation time is limited, the inner sealing protective layer is manufactured upwards from a position close to the water surface, namely, the area closer to the sea level is scraped first and is coated;
thirdly, preparing an external sealing protective layer
After the operation of the inner sealing protective layer is finished, coating a vulcanization type aluminum-rich silane modified polymer sealant on the inner sealing protective layer in 1-2h to form an outer sealing protective layer with the average thickness of 0.5-2 mm;
when tidal water rises or the operation time is limited, the outer sealing protective layer can be prepared by following the formation of the operation surface of the inner sealing protective layer, so that more standing time can be reserved after the outer sealing protective layer is prepared;
the fourth step is to prepare a wrapping layer
After the outer sealing protective layer is formed, wrapping the PVF adhesive tape for 4-5h to form a wrapping layer, wherein the thickness of the wrapping layer is 0.125-0.5 mm;
when the tide rises or the operation time is limited, immediately performing PVF adhesive tape wrapping operation along the upward direction from the water surface or the designed lower limit position before the tide rises again to reach the designed wrapping position for at least 10 min; a sealing adhesive layer of 200mm can be reserved at the lower part of the PVF adhesive tape, the PVF adhesive tape is wound and wrapped twice along the horizontal position of the steel member substrate, then the PVF adhesive tape is wound and wrapped upwards along the steel member substrate in a spiral mode, and adjacent PVF adhesive tapes are overlapped according to 30% -50%; when the steel member is wrapped to the upper part and the end is closed, wrapping the steel member substrate twice along the horizontal position of the upper part, and lapping and transiting the steel member substrate with the surface of the upper steel member substrate; the lap joint position of the upper wrapping bag should exceed the splash zone or the highest tide zone of astronomical tide;
when the surface of the special-shaped steel member base body is wrapped, the PVF adhesive tape is tensioned while the PVF adhesive tape is pressed against the contact part of the PVF adhesive tape and the surface of the special-shaped steel member base body, the adhesive wrapping tape is continuously pressed forwards, and the pressed adhesive part is repeatedly pressed and compacted by a pressing roller tool;
when the PVF adhesive tape is wrapped, cleaning and drying work of the bonding surface is timely done, and the bonding quality cannot be influenced by visible water drops, water marks and water mist;
the quick-drying zinc-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 30-40 parts of high-activity silane modified polymer resin, 10-20 parts of non-alcohol plasticizer, 40-60 parts of flaky zinc powder, 0.5-1 part of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 2-4 parts of water removing agent, 0.1-1 part of alkaline assistant, 0.5-1 part of aminosilane adhesion promoter and 1-2 parts of organic tin catalyst;
the vulcanized aluminum-rich silane modified polymer sealant comprises the following raw materials in parts by weight: 40-50 parts of silane modified polymer resin, 1-5 parts of non-floating flaky aluminum powder, 2-10 parts of floating flaky aluminum powder, 30-40 parts of nano calcium carbonate, 0.1-1 part of cellulose acetate butyrate, 0.5-2 parts of hydrophobic fumed silica, 0.5-2 parts of heat stabilizer, 1-5 parts of dehydrator, 1-2 parts of epoxy silane and 0.5-2 parts of organic tin catalyst;
the high-activity silane modified polymer resin refers to trimethoxy terminated resin in silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane SPUR or silane modified resin STP;
the non-alcohol plasticizer is any one of diisononyl phthalate, dioctyl phthalate or diisodecyl phthalate;
the alkaline auxiliary agent is one of or a mixture of any two of three solid powdery trisodium phosphate, sodium tripolyphosphate and sodium carbonate in any mass ratio;
the heat stabilizer is a BASF antioxidant Irganox 1010;
the water removing agent is vinyl trimethoxy silane.
5. A steel member surface heavy duty sealing wrap maintenance method as claimed in claim 1 or 4, characterized in that: when the surface of the steel member is subjected to anticorrosion sealing wrapping operation, the wrapped surface of the defect position is subjected to secondary wrapping of the PVF adhesive tape or adhesion of the PVF adhesive tape after the wrapped surface of the defect position is finished or flattened at the defect position where the PVF adhesive tape is accidentally damaged, the joint is warped, bubbled or bulged, the adhesive surface is wet or has poor adhesion or the adhesion effect does not meet the design requirement, and the surface is compacted by a press roller;
and the outer layer of the secondary wrapping PVF adhesive tape is wrapped or stuck to the position outside the defect edge by at least 50mm, and when the secondary wrapping PVF adhesive tape is wrapped or stuck with the PVF adhesive tape, the superposition of the adjacent adhesive tapes is not less than 50%.
6. A steel member surface heavy duty sealing wrap maintenance method as claimed in claim 1 or 4, characterized in that: and a weather-resistant finish coat is also coated on the surface of the outer sealing protective layer, and the thickness is not less than 70 mu m.
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| CN102383619B (en) * | 2011-10-16 | 2013-07-17 | 江苏中矿大正表面工程技术有限公司 | Method for preventing corrosion of concrete members in tidal range zone and splash zone of ocean |
| CN102504748B (en) * | 2011-11-07 | 2014-01-08 | 广州机械科学研究院有限公司 | Silane modified polyurethane sealing glue with quick surface dry as well as preparation and application thereof |
| KR101267433B1 (en) * | 2012-10-19 | 2013-05-30 | (주) 인택산업 | Water proofing and floor construction method on concrete using eco-friendly materials |
| CN104062398B (en) * | 2013-03-18 | 2016-03-02 | 福建省腾龙工业公司 | A kind of detection method of leafing-type aluminium powder slurry floating force |
| CN106700940B (en) * | 2016-12-16 | 2019-01-15 | 江苏卓奇新材料科技有限公司 | Unvulcanised silane modified polymer zinc powder cream and its composite protection structure for main rope of suspension bridge |
| CN108165230B (en) * | 2017-12-28 | 2021-12-31 | 江苏卓奇新材料科技有限公司 | Single-component silane modified sealant for industrialized building |
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Denomination of invention: Maintenance method of heavy anti-corrosion sealing wrapping on steel member surface Effective date of registration: 20211124 Granted publication date: 20200121 Pledgee: Industrial Bank Co.,Ltd. Shanghai Hongkou sub branch Pledgor: SHANGHAI QIHAI ANTI-CORROSION ENGINEERING TECHNOLOGY Co.,Ltd. Registration number: Y2021980013286 |
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Denomination of invention: Maintenance method for heavy-duty anti-corrosion sealing and wrapping on the surface of steel components Effective date of registration: 20231122 Granted publication date: 20200121 Pledgee: Industrial Bank Co.,Ltd. Shanghai Hongkou sub branch Pledgor: SHANGHAI QIHAI ANTI-CORROSION ENGINEERING TECHNOLOGY Co.,Ltd. Registration number: Y2023310000760 |