Coating method of fireproof coating

Abstract

The invention discloses a coating method of a fireproof coating, and relates to the technical field of coating. The coating method of the fireproof coating is applied to ocean vessels and comprises the following steps: coating the fireproof coating on a primer layer of a metal base material containing primer, and curing to form a fireproof coating layer; the fireproof coating layer is coated with finish paint, and the ship containing the fireproof coating is formed; wherein the construction temperature of the metal base material containing the primer is T1, the dew point temperature is T2, and T1-T2 is larger than or equal to 3 DEG C. The fireproof coating layer is located between the primer and the finishing paint, is separated from a metal body by the primer and is separated from the external environment by the finishing paint, so that corrosion of the fireproof coating to a metal matrix, namely a ship body, is reduced, meanwhile, aging failure of the fireproof coating due to long-term contact with air is reduced, the durability of the fireproof coating is improved, and the fireproof performance of the ship is improved. Meanwhile, moisture on the primer layer can be prevented from being condensed into dewdrops, the connection firmness between the fireproof coating layer and the primer layer is improved, and layering and falling of the fireproof coating layer are reduced.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a method for coating a fire retardant coating. Background Art

[0002] Special vessels are a type of ship with specific functions and usage scenarios, such as ocean-going survey vessels, submarine operation vessels, polar exploration vessels, etc. Their design often focuses more on the compactness, airtightness and continuity of operation of the structure. Such ships are usually used to perform specific and complex tasks, and have extremely strict safety requirements such as fire prevention. Their fire resistance requirements are different from those of ordinary ships. Therefore, it is necessary to develop new coating methods for fire retardant coatings for special ships, improve the durability of fire retardant materials, and enhance the fire resistance of ships. Summary of the invention

[0003] The present application provides a method for applying a fire retardant coating, so as to develop a new coating method for fire retardant coatings for special ships, improve the durability of the fire retardant coatings, and enhance the fire resistance of ships.

[0004] In a first aspect, the present application provides a method for applying a fire retardant coating, which is applied to an ocean-going vessel, comprising the following steps:

[0005] Applying fire retardant coating on the primer layer of the metal substrate containing primer, and after curing, forming a fire retardant coating layer;

[0006] Applying a topcoat on the fire retardant coating layer to form a ship containing the fire retardant coating;

[0007] Among them, the construction temperature of the metal substrate containing primer is T1, the dew point temperature is T2, and T1-T2≥3℃.

[0008] The present application first applies a fire retardant coating on the primer layer of the metal substrate containing the primer, forms a fire retardant coating layer after curing, and then applies a topcoat on the fire retardant coating layer. After curing, a ship containing the fire retardant coating is formed, so that the fire retardant coating layer is located between the primer and the topcoat, separated from the metal body by the primer, and separated from the external environment by the topcoat, thereby reducing the corrosion of the metal substrate, i.e., the hull, by the fire retardant coating, and at the same time reducing the aging failure of the fire retardant coating due to long-term contact with the air, thereby improving the durability of the fire retardant coating and the fireproof performance of the ship. At the same time, the construction temperature of the metal substrate containing the primer is T1, the dew point temperature is T2, and T1-T2 ≥ 3°C, which can reduce the condensation of water vapor on the primer layer into dew drops, improve the firmness of the connection between the fire retardant coating layer and the primer layer, and reduce stratification and shedding of the fire retardant coating layer.

[0009] It should be noted that the dew point temperature refers to the temperature at which water vapor begins to condense into dew drops when a gas mixture (usually air) is cooled under a certain pressure. The construction temperature of the primer-containing metal substrate refers to the temperature of the primer-containing metal substrate during construction. Usually, the primer-containing metal substrate is placed in the construction environment for a certain period of time to stabilize the primer-containing metal substrate and the ambient temperature. The temperature of the primer-containing metal substrate is controlled by controlling the construction environment temperature.

[0010] It should be noted that the primer can be solvent-free epoxy anti-rust primer. The topcoat can be solvent-free epoxy topcoat. The fire retardant coating layer can be organic or inorganic fire retardant coating, and the organic fire retardant coating needs to pass the smoke density and toxicity test at high temperature.

[0011] In some embodiments, the humidity of the construction of the metal substrate containing the primer is 10% to 85% RH. The humidity of the construction of the metal substrate containing the primer is within this range. On the one hand, it can reduce the probability of cracking of the fire retardant coating layer due to excessive drying, and on the other hand, it can reduce the adhesion of water vapor to the primer layer and reduce the stratification of the fire retardant coating layer and the primer layer.

[0012] In some embodiments, the thickness of the fire retardant coating layer is 2.0 to 10.0 mm. When the thickness of the fire retardant coating layer is within this range, the durability of the fire retardant coating can be further improved, the fire retardant performance of the ship can be enhanced, and the impact on the weight of the ship can be reduced.

[0013] In some embodiments, the step of coating a fire retardant coating on a primer of a metal substrate containing a primer to form a fire retardant coating layer comprises:

[0014] Sand and clean metal substrates;

[0015] Applying a primer on the metal substrate containing the primer to form a primer layer;

[0016] Roughen the primer layer and clean it;

[0017] A fire retardant coating is applied on the primer layer to form a fire retardant coating layer.

[0018] By grinding the metal substrate, impurities and uneven locations can be removed, defects can be reduced, the adhesion of the metal substrate to the primer can be improved, the firmness of the connection between the primer and the metal substrate can be improved, and delamination and shedding can be reduced. By roughening the primer layer and then applying fire retardant coating on the primer layer, the adhesion of the primer layer to the fire retardant coating can be improved, the firmness of the connection between the primer and the fire retardant coating can be improved, and delamination and shedding can be reduced.

[0019] In some embodiments, in the polishing and cleaning of the metal substrate, the polishing grade of the metal substrate surface is greater than or equal to St2.5. The polishing grade refers to the surface roughness and flatness achieved after the oxide layer, rust, burrs, welding slag and uneven parts on the metal surface are removed by polishing. Specifically, the IS08501-1 system divides the polishing grade into two categories: St (manual or power tool polishing) and Sa (sandblasting polishing). A polishing grade greater than or equal to St2.5 requires the removal of all loose rust, scale, old coating and other contaminants on the metal surface, and at the same time, it needs to be polished to the original color of the metal to provide a better adhesion surface for subsequent coating or anti-corrosion treatment, thereby improving the durability and anti-corrosion effect of the coating.

[0020] In some embodiments, the primer layer is roughened and the cleaned primer layer is treated with sandpaper having a mesh number of less than or equal to 80. Roughening is a surface treatment process, which is mainly used to increase the roughness of the material surface. The roughening sandpaper having a mesh number of less than or equal to 80 can effectively remove the old coating, oxide layer, rust and uneven parts on the metal surface, significantly increase the roughness of the surface, and provide a better adhesion surface for subsequent coatings or adhesives.

[0021] In some embodiments, the fire retardant coating is applied on the primer layer to form a fire retardant coating layer, and the number of times the fire retardant coating is applied is 1 to 5 times. Multiple coatings can further improve the firmness of the connection between the fire retardant coating and the primer layer, making the primer layer more uniform and reducing sagging. Usually, the next coating can be applied only after the previous coating is dry, and it is better to leave no sagging during coating.

[0022] It should be noted that the method of applying the fire retardant coating can be spraying or brushing, and the choice can be made according to actual conditions.

[0023] In some embodiments, the fire retardant coating is applied on the primer layer of the metal substrate containing the primer, and after curing, a fire retardant coating layer is formed, and the method of applying the fire retardant coating includes spraying, wherein:

[0024] The angle between the nozzle and the fire retardant coating layer is 60° to 90°. When the angle between the nozzle and the fire retardant coating layer is within this range, the paint mist can make the paint contact the surface more directly, which is helpful for the combination of the paint and the surface, improves the adhesion, and avoids the accumulation of paint or uneven coverage caused by too small or too large an angle, which affects the performance and appearance of the coating; and / or,

[0025] The distance between the nozzle and the fire retardant coating layer is 40 to 60 cm. When the distance between the nozzle and the fire retardant coating layer is within this range, the sprayed paint can more effectively cover the target area and deposit on the substrate surface, which can reduce the number of repeated spraying times, thereby improving work efficiency and saving time and materials.

[0026] In some embodiments, the fire retardant coating is applied on the primer layer of the metal substrate containing the primer, and after curing, a fire retardant coating layer is formed, and the method of applying the fire retardant coating includes spraying, wherein:

[0027] When spraying fire retardant coatings, spray from bottom to top. When spraying fire retardant coatings, spraying from bottom to top can use gravity to help the paint flow downward more naturally, help the paint adhere evenly to the surface, reduce paint scattering and rebound, and improve spraying efficiency.

[0028] In some embodiments, the curing temperature is 10-35° C. The curing temperature within this range can stabilize the connection between the layers, improve the bonding firmness, and improve the durability of the fire retardant coating layer; and / or,

[0029] The curing time is greater than or equal to 24 hours. Curing time within this range can stabilize the connection between the layers, improve the bonding firmness, and improve the durability of the fire retardant coating layer; and / or,

[0030] The curing humidity is less than or equal to 80% RH. When the curing humidity is within this range, the impact of water vapor on each coating can be reduced and the durability of the fire retardant coating layer can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a flow chart of a method for applying a fire retardant coating according to an embodiment of the present application.

[0033] Figure 2 This is a schematic diagram of the fire retardant coating layer structure of a method for applying fire retardant coating according to an embodiment of the present application.

[0034] Figure 3 This is a flow chart of a method for applying a fire retardant coating according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0036] Special vessels are a type of ship with specific functions and usage scenarios, such as ocean-going survey vessels, submarine operation vessels, polar exploration vessels, etc. Their design often focuses more on the compactness, airtightness and continuity of operation of the structure. Such ships are usually used to perform specific and complex tasks, and have extremely strict safety requirements such as fire prevention. Their fire resistance requirements are different from those of ordinary ships. Therefore, it is necessary to develop new coating methods for fire retardant coatings for special ships, improve the durability of fire retardant materials, and enhance the fire resistance of ships.

[0037] In view of this, a new coating method is developed for fire-retardant coatings for special ships to improve the durability of fire-retardant materials and enhance the fire-retardant performance of ships.

[0038] First, as Figure 1 As shown, the present application provides a method for applying a fire retardant coating, which is applied to an ocean-going ship, comprising the following steps:

[0039] S100, coating a fire retardant coating on the primer layer of the metal substrate containing the primer, and forming a fire retardant coating layer after curing;

[0040] S200, applying a topcoat on the fire retardant coating layer to form a ship containing the fire retardant coating;

[0041] Among them, the construction temperature of the metal substrate containing primer is T1, the dew point temperature is T2, and T1-T2≥3℃.

[0042] The present invention first applies a fire retardant coating on a primer layer of a metal substrate containing a primer, and after curing, forms a fire retardant coating layer, and then applies a topcoat on the fire retardant coating layer, and after curing, forms a ship containing a fire retardant coating, such as Figure 2 As shown, the fire retardant coating layer is located between the primer and the topcoat, separated from the metal body by the primer, and separated from the external environment by the topcoat, reducing the corrosion of the fire retardant coating to the metal substrate, i.e., the hull, and reducing the aging failure of the fire retardant coating due to long-term contact with air, thereby improving the durability of the fire retardant coating and the fireproof performance of the ship. At the same time, the construction temperature of the metal substrate containing the primer is T1, the dew point temperature is T2, and T1-T2 ≥ 3°C, which can reduce the condensation of water vapor on the primer layer into dew drops, improve the firmness of the connection between the fire retardant coating layer and the primer layer, and reduce stratification and shedding of the fire retardant coating layer.

[0043] It should be noted that the dew point temperature refers to the temperature at which water vapor begins to condense into dew drops when a gas mixture (usually air) is cooled under a certain pressure. The construction temperature of the primer-containing metal substrate refers to the temperature of the primer-containing metal substrate during construction. Usually, the primer-containing metal substrate is placed in the construction environment for a certain period of time to stabilize the primer-containing metal substrate and the ambient temperature. The temperature of the primer-containing metal substrate is controlled by controlling the construction environment temperature.

[0044] It should be noted that the primer can be solvent-free epoxy anti-rust primer. The topcoat can be solvent-free epoxy topcoat. The fire retardant coating layer can be organic or inorganic fire retardant coating, and the organic fire retardant coating needs to pass the smoke density and toxicity test at high temperature.

[0045] During the specific construction, due to the large size of the ship, the construction personnel should carefully and carefully read the various design technical requirements, construction nodes and insulation laying locations. Before the construction of the fire retardant coating, technical training should be conducted for the construction, quality inspection, dispatching and other personnel, including the construction process, operation essentials and precautions. The construction party should have professional and technical personnel responsible for quality supervision and on-site coordination. After training, the construction personnel should ensure relative stability and strictly carry out the construction in accordance with the requirements of this technical specification. All fire retardant coatings that are damp or soaked in water shall not be used on board, and construction shall not be carried out when there is condensation on the surface of the components. Before laying the fire retardant coating, the steel bulkheads and steel decks of the cabin must be corrected and passed the tightness inspection. The surface of the steel bulkheads and steel decks shall be derusted and painted with primer in accordance with the requirements of the relevant technical drawings. All kinds of brackets, bases, ducts and openings on the steel bulkheads and steel decks that need to be welded should be installed and welded. The open flame and electric welding work on the back of the steel bulkheads and steel decks where the fire retardant coating is laid should be completed in advance. All kinds of doors, windows and covers should be installed. The fire-resistant insulation on the steel bulkheads or steel decks at the A-60, A-30 and A-15 fire-resistant divisions must be extended outward at all termination points and junctions according to the requirements of the fire-resistant structural insulation layout diagram, and the extension distance must not be less than 450mm. Confirm the temperature and humidity of the construction environment. For the environment temperature that is too low or too high, corresponding cooling / lowering measures should be taken. The paint has low strength in the initial stage of construction and is easily damaged. The coating that has not dried completely must not be collided. After construction, until it is completely dry, the paint must not be exposed to rain or water. Construction personnel must wear safety protection equipment before operating the equipment.

[0046] There should be sufficient work area near the construction site. The work area should be flat and clean, dust-free, well ventilated and rainproof, and have sufficient lighting. Damaged areas of primer need to be repainted. After maintenance, the quality of the paint area should be checked. Defects such as insufficient thickness and surface pits should be repaired in a timely manner.

[0047] In combination with the first aspect, in some embodiments provided in the present application, the humidity of the construction of the metal substrate containing the primer is 10% to 85% RH. The humidity of the construction of the metal substrate containing the primer is within this range. On the one hand, it can reduce the probability of cracking of the fire retardant coating layer due to excessive dryness, and on the other hand, it can reduce the adhesion of water vapor to the primer layer and reduce the stratification of the fire retardant coating layer and the primer layer.

[0048] In combination with the first aspect, in some embodiments provided in the present application, the thickness of the fire retardant coating layer is 2.0 to 10.0 mm. When the thickness of the fire retardant coating layer is within this range, the durability of the fire retardant coating can be further improved, the fire retardant performance of the ship can be enhanced, and the impact on the weight of the hull can be reduced.

[0049] Combined with the first aspect, Figure 3 As shown, in some embodiments provided in the present application, the step of coating a fire retardant coating on a primer of a metal substrate containing a primer to form a fire retardant coating layer comprises:

[0050] S101, polish and clean the metal substrate;

[0051] S102, coating a primer on the metal substrate containing the primer to form a primer layer;

[0052] S103, roughening the primer layer and cleaning the primer layer;

[0053] S104, coating a fire retardant coating on the primer layer to form a fire retardant coating layer.

[0054] By grinding the metal substrate, impurities and uneven locations can be removed, defects can be reduced, the adhesion of the metal substrate to the primer can be improved, the firmness of the connection between the primer and the metal substrate can be improved, and delamination and shedding can be reduced. By roughening the primer layer and then applying fire retardant coating on the primer layer, the adhesion of the primer layer to the fire retardant coating can be improved, the firmness of the connection between the primer and the fire retardant coating can be improved, and delamination and shedding can be reduced.

[0055] In combination with the first aspect, in some embodiments provided in the present application, in the polishing and cleaning of the metal substrate, the polishing grade of the metal substrate surface is greater than or equal to St2.5. The polishing grade refers to the surface roughness and flatness achieved after the oxide layer, rust, burrs, welding slag and uneven parts on the metal surface are removed by polishing. Specifically, the IS08501-1 system divides the polishing grade into two categories: St (manual or power tool polishing) and Sa (sandblasting polishing). A polishing grade greater than or equal to St2.5 requires the removal of all loose rust, oxide scale, old coatings and other contaminants on the metal surface, and at the same time, it needs to be polished to the original color of the metal to provide a better adhesion surface for subsequent coating or anti-corrosion treatment, thereby improving the durability and anti-corrosion effect of the coating.

[0056] In combination with the first aspect, in some embodiments provided in the present application, the primer layer is roughened and the sandpaper used in the cleaning of the primer layer is less than or equal to 80 mesh. Roughening is a surface treatment process, which is mainly used to increase the roughness of the material surface. The sandpaper used in the roughening process with a mesh number of less than or equal to 80 mesh can effectively remove old coatings, oxide layers, rust and uneven parts on the metal surface, significantly increase the roughness of the surface, and provide a better adhesion surface for subsequent coatings or adhesives.

[0057] In combination with the first aspect, in some embodiments provided in the present application, the fire retardant coating is applied on the primer layer to form a fire retardant coating layer, and the number of times the fire retardant coating is applied is 1 to 5 times. Multiple coatings can further improve the firmness of the connection between the fire retardant coating and the primer layer, making the primer layer more uniform and reducing sagging. Usually, the next coating can be applied only after the previous coating is dry, and it is advisable to leave no sagging during coating.

[0058] It should be noted that the method of applying the fire retardant coating can be spraying, which covers the fire retardant coating evenly and efficiently; it can also be brushing, which is applied manually, with higher construction flexibility and accuracy, and can be selected according to actual conditions.

[0059] In combination with the first aspect, in some embodiments provided in the present application, a fire-retardant coating is applied on a primer layer of a primer-containing metal substrate, and after curing, a fire-retardant coating layer is formed. The method of applying the fire-retardant coating includes spraying, wherein: the angle between the nozzle and the fire-retardant coating layer is 60° to 90°. When the angle between the nozzle and the fire-retardant coating layer is within this range, the paint mist can more directly contact the paint with the surface, which helps the paint to combine with the surface, improves adhesion, and avoids paint accumulation or uneven coverage caused by an angle that is too small or too large, which affects the performance and appearance of the coating.

[0060] In combination with the first aspect, in some embodiments provided in the present application, a fire-retardant coating is applied on a primer layer of a primer-containing metal substrate, and after curing, a fire-retardant coating layer is formed. The method of applying the fire-retardant coating includes spraying, wherein: the distance between the nozzle and the fire-retardant coating layer is 40 to 60 cm. When the distance between the nozzle and the fire-retardant coating layer is within this range, the sprayed paint can more effectively cover the target area and be deposited on the surface of the substrate, thereby reducing the number of repeated spraying times required, thereby improving work efficiency and saving time and materials.

[0061] In combination with the first aspect, in some embodiments provided in the present application, the fire retardant coating is applied on the primer layer of the primer-containing metal substrate, and after curing, a fire retardant coating layer is formed, and the method of applying the fire retardant coating includes spraying, wherein: the fire retardant coating is sprayed from bottom to top. Spraying the fire retardant coating from bottom to top can use gravity to help the paint flow more naturally downward, which helps the paint to adhere evenly to the surface, reduce paint scattering and rebound, and improve spraying efficiency.

[0062] In combination with the first aspect, in some embodiments provided in the present application, the curing temperature is 10 to 35°C. Within this curing temperature range, the connection between the layers can be stabilized, the bonding strength can be improved, and the durability of the fire retardant coating layer can be improved.

[0063] In combination with the first aspect, in some embodiments provided in the present application, the curing time is greater than or equal to 24 hours. When the curing time is within this range, the connection between the layers can be stabilized, the bonding strength can be improved, and the durability of the fire retardant coating layer can be improved.

[0064] In combination with the first aspect, in some embodiments provided in the present application, the curing humidity is less than or equal to 80% RH. Curing humidity within this range can reduce the impact of water vapor on each coating and improve the durability of the fire retardant coating layer.

[0065] For fire retardant coatings that require a brushing process, the specific construction method can be:

[0066] According to the material instructions, pour the weighed components of the paint into a clean container and mix them thoroughly using a stirring rod or electric mixer. After processing, stack them neatly in a clean and dry cabin according to the deck level.

[0067] Substrate surface treatment: For metal substrate materials, surface dust, oil stains and rust should be thoroughly removed.

[0068] Apply primer: Apply primer (scrape, wipe or spray, the same below) on the surface of the substrate in 2 coats. No subsequent construction shall be carried out before the primer is completely dry.

[0069] Confirm the paint status: Confirm the production date and shelf life on the paint packaging to ensure that it is within the applicable range. Open the paint packaging to confirm that the paint color, viscosity, etc. are in normal condition.

[0070] Paint weighing and batching: For single-component paint, the required paint mass is calculated based on the area to be constructed and the amount of paint per unit area. For two-component and multi-component paints, the conversion also needs to be performed according to the component ratio.

[0071] Paint application: In the construction area, the total thickness of each coat is determined according to the different construction thicknesses and coating process methods. The thickness of the first coat should be able to cover the surface of the topcoat, generally not exceeding 2.0mm. The next coat can be applied only after the previous coat is dry, and it is best not to leave any residue when applying.

[0072] Maintenance: The best temperature for paint maintenance is (10-35)℃, and the relative humidity is ≤80. After the paint reaches the specified thickness, the maintenance time shall generally not be less than 24h. If the ambient temperature is lower, the corresponding maintenance time shall be appropriately extended depending on the situation. After the maintenance is completed, the quality of the paint area shall be inspected. Defects such as insufficient thickness and surface pits shall be repaired in time.

[0073] Apply topcoat: Apply 1 coat. After the topcoat is completely dry, the area can be used normally.

[0074] Repair damaged work surface: After the shaping is completed, the entire spray coating should be visually inspected to ensure that the surface of the spray coating is basically flat, the fibers are evenly distributed, and there should be no honeycomb defects.

[0075] Acceptance: After accelerated simulation of hot and cold climate tests throughout the year, the coating has no cracking or falling off; it has good matching with the primer of the installation location, and has no falling off or cracks.

[0076] For fire retardant coatings that require spraying technology, the construction method can be:

[0077] According to the material instructions, pour the weighed components of the paint into a clean container and mix them thoroughly using a stirring rod or electric mixer. After processing, stack them neatly in a clean and dry cabin according to the deck level.

[0078] Substrate surface treatment: For metal substrate materials, surface dust, oil stains and rust should be thoroughly removed.

[0079] Apply primer: Apply primer (scrape, wipe or spray, the same below) on the surface of the substrate in 2 coats. No subsequent construction shall be carried out before the primer is completely dry.

[0080] Confirm the paint status: Confirm the production date and shelf life on the paint packaging to ensure that it is within the applicable range. Open the paint packaging to confirm that the paint color, viscosity, etc. are in normal condition.

[0081] Paint weighing and batching: For single-component paint, the required paint mass is calculated based on the area to be constructed and the amount of paint per unit area. For two-component and multi-component paints, the conversion also needs to be performed according to the component ratio.

[0082] Spraying operation: spray layer by layer according to the material characteristics. The next layer can be sprayed only after the previous layer is dry. The thickness of each layer should be suitable to prevent sagging. When spraying the cabin wall, first spray the side of the reinforcement or beam, then spray the surrounding of the reinforcement or beam, and spray from bottom to top.

[0083] Maintenance: The best temperature for paint maintenance is (10-35)℃, and the relative humidity is ≤80. After the paint reaches the specified thickness, the maintenance time shall generally not be less than 24h. If the ambient temperature is lower, the corresponding maintenance time shall be appropriately extended depending on the situation. After the maintenance is completed, the quality of the paint area shall be inspected. Defects such as insufficient thickness and surface pits shall be repaired in time.

[0084] Apply topcoat: Apply 1 coat. After the topcoat is completely dry, the area can be used normally.

[0085] Repair damaged work surface: After the shaping is completed, the entire spray coating should be visually inspected to ensure that the surface of the spray coating is basically flat, the fibers are evenly distributed, and there should be no honeycomb defects.

[0086] Acceptance: After accelerated simulation of hot and cold climate tests throughout the year, the coating has no cracking or falling off; it has good matching with the primer of the installation location, and has no falling off or cracks.

[0087] In summary, by first coating the fire retardant coating on the primer layer of the metal substrate containing the primer, after curing, a fire retardant coating layer is formed, and then coating the topcoat on the fire retardant coating layer, after curing, a ship containing the fire retardant coating is formed, so that the fire retardant coating layer is located between the primer and the topcoat, separated from the metal body by the primer, and separated from the external environment by the topcoat, reducing the corrosion of the fire retardant coating to the metal substrate, i.e., the hull, and reducing the aging failure of the fire retardant coating due to long-term contact with the air, thereby improving the durability of the fire retardant coating and the fireproof performance of the ship. At the same time, the construction temperature of the metal substrate containing the primer is T1, the dew point temperature is T2, T1-T2 ≥ 3°C, which can reduce the condensation of water vapor on the primer layer into dew drops, improve the firmness of the connection between the fire retardant coating layer and the primer layer, and reduce stratification and shedding of the fire retardant coating layer.

[0088] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0089] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically stipulated.

[0090] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A method for applying a fire retardant coating, applied to an ocean-going vessel, characterized in that: The following steps are involved: Applying fire retardant coating on the primer layer of the metal substrate containing primer, and after curing, forming a fire retardant coating layer; Applying a topcoat on the fire retardant coating layer to form a ship containing the fire retardant coating; Among them, the construction temperature of the metal substrate containing primer is T1, the dew point temperature is T2, and T1-T2≥3℃.

2. The method for applying a fire retardant coating according to claim 1, characterized in that: The humidity for construction of metal substrates containing primers is 10% to 85% RH.

3. The method for applying a fire retardant coating according to claim 1, characterized in that: The thickness of the fire retardant coating layer is 2.0 to 10.0 mm.

4. The method for applying a fire retardant coating according to claim 1, characterized in that: The method of coating the fire retardant coating on the primer of the metal substrate containing the primer to form the fire retardant coating layer comprises: Sand and clean metal substrates; Applying a primer on the metal substrate containing the primer to form a primer layer; Roughen the primer layer and clean it; A fire retardant coating is applied on the primer layer to form a fire retardant coating layer.

5. The method for applying a fire retardant coating according to claim 4, characterized in that: In the polishing and cleaning of the metal substrate, the polishing grade of the surface of the metal substrate is greater than or equal to St2.

5.

6. The method for applying a fire retardant coating according to claim 4, characterized in that: The primer layer is roughened and the primer layer is cleaned, and the mesh number of the sandpaper used for the roughening treatment is less than or equal to 80 meshes.

7. The method for applying a fire retardant coating according to claim 4, characterized in that: In the process of coating the fire retardant coating on the primer layer to form the fire retardant coating layer, the number of times of coating the fire retardant coating is 1 to 5 times.

8. The method for applying a fire retardant coating according to claim 1, characterized in that: The fire retardant coating is applied on the primer layer of the primer-containing metal substrate, and after curing, a fire retardant coating layer is formed. The method of applying the fire retardant coating includes spraying, wherein: The angle between the nozzle and the fire retardant coating layer is 60° to 90°; and / or, The distance between the nozzle and the fire retardant coating layer is 40 to 60 cm.

9. The method for applying a fire retardant coating according to claim 1, characterized in that: The fire retardant coating is applied on the primer layer of the primer-containing metal substrate, and after curing, a fire retardant coating layer is formed. The method of applying the fire retardant coating includes spraying, wherein: When spraying fire retardant coating, spray from bottom to top.

10. The method for applying a fire retardant coating according to claim 1, wherein: The curing temperature is 10-35°C; and / or, The curing time is greater than or equal to 24 hours; and / or, The curing humidity is less than or equal to 80% RH.

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