A sealing protective coating material, its preparation method and application

Abstract

The present application relates to a kind of seal protection coating and its preparation method and application, belong to the field of coating composition.Seal protection coating includes A liquid and B liquid, the mass ratio of A liquid and B liquid is 3:1~8:1.A liquid includes the following weight parts of raw materials: polyether polyol 20~60 parts, polyester polyol 20~30 parts, isocyanate 20~50 parts.B liquid includes the following weight parts of raw materials: pigment filler 25~55 parts, polyether amine 15~35 parts, chain extender 8~25 parts, plasticizer 3~8 parts, active diluent 3~8 parts, auxiliary 1~5 parts, flame retardant 5~15 parts.The pigment filler includes hollow microsphere and graphene, also can add silica aerogel and / or titanium dioxide.A liquid and B liquid are mixed sufficiently when construction, form a layer of closed protective film, play the role of seal protection.Protective film can be removed in the way of tearing and peeling.

Description

Technical Field

[0001] This invention belongs to the field of coating compositions, specifically relating to a sealing and protective coating, its preparation method, and its application. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Existing packaging protection materials, methods, and approaches are all targeted and have specific application requirements. As the technical requirements for material packaging protection continue to increase, it is necessary to continuously research new packaging protection materials and methods to improve the level of packaging protection technology and meet the needs of material packaging protection. Currently, the demand for sealing and protection technology is becoming increasingly apparent across various industries. Product surfaces have protective coatings that effectively prevent scratches, bumps, burns, yellowing, etc., during use; equipment packaging surfaces have sealing coatings that effectively protect equipment from friction, bumps, dust, moisture, and salt spray corrosion during transportation and long-term storage; metal sprayed parts have protective coatings that prevent oxidation, corrosion, and secondary pollution; spare parts are wrapped with sealing coatings to keep spare parts looking new and ensure they are readily available.

[0004] During the sealing and protection of goods, the sealing effect is often reduced due to the combined effects of environmental factors such as rain, snow, humidity, acidity, alkali, and temperature. Among these, air temperature and humidity have the most serious impact, usually manifesting as corrosion of metal products, mildew and rot of textiles and fur products, mold, fogging or delamination of optical instruments, failure of electronic components, and aging of polymer products.

[0005] Therefore, preparing a sealing coating to seal the protected equipment and items, keeping their interiors dry and reducing natural corrosion, is the main way to prevent or delay quality changes in the core components of the protected equipment and items. When using the protected equipment and items, removing the sealing coating from the outer surface or the packaging allows for immediate use of the well-preserved protected equipment and items.

[0006] In addition to general requirements such as shockproof, mildewproof, moistureproof, rustproof, and insectproof, protective coatings for storage also require good sealing properties, resistance to oil and mud stains, waterproofing, and flame retardancy. They should also be easy to use, quick to remove, and leave minimal residue. Generally, coatings with good sealing effects and high mechanical properties also have high peel and tear strength, making them difficult to remove and handle. Solvent-based peelable protective coatings contain organic solvents, which are harmful to the environment and human health, limiting their application scenarios. Hot-melt peelable protective coatings have low material strength, complex coating processes, and poor peelability. Water-based peelable protective coatings have limited thickness, poor durability, and poor protection against impacts to equipment and items. The presence of moisture also makes water-based coatings unsuitable for protecting metal instruments and precision electronic instruments. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a sealing and protective coating, its preparation method, and its application. The sealing and protective coating features rapid curing, strong adaptability to complex irregular structures (such as irregular protrusions, pits, and gaps), excellent performance, and the ability to be quickly peeled off and unsealed.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] In the first aspect, a sealing and protective coating includes liquid A and liquid B, wherein the mass ratio of liquid A to liquid B is 3:1 to 8:1.

[0010] Liquid A comprises the following raw materials in parts by weight: 20-60 parts of polyether polyol, 20-30 parts of polyester polyol, and 20-50 parts of isocyanate.

[0011] The B solution comprises the following raw materials in parts by weight: 25-55 parts pigments and fillers, 15-35 parts polyetheramine, 8-25 parts chain extender, 3-8 parts plasticizer, 3-8 parts reactive diluent, 1-5 parts additives, and 5-15 parts flame retardant.

[0012] The pigments and fillers include hollow microspheres and graphene; the amount of hollow microspheres is ≥10 parts, and the amount of graphene is ≥5 parts.

[0013] The hollow microspheres are ceramic hollow microspheres or glass hollow microspheres, with a particle size of 60-120 μm and a shatter resistance strength >15 MPa.

[0014] The graphene is graphene oxide.

[0015] Optionally, silica aerogel and / or titanium dioxide may be added to the pigments and fillers.

[0016] The silica aerogel has a particle size of 10–30 μm and a pore diameter of 20–50 nm.

[0017] The titanium dioxide is rutile titanium dioxide modified with aluminum surface, with a solar reflectance ≥80%.

[0018] Optionally, the plasticizer is a phthalate plasticizer.

[0019] Optionally, the reactive diluent is a multifunctional reactive diluent.

[0020] Optionally, the flame retardant is aluminum hydroxide or magnesium hydroxide flame retardant.

[0021] Optionally, the polyether polyol in solution A includes one or more of the following: polypropylene oxide glycol, polytetrahydrofuran glycol, and tetrahydrofuran-propylene oxide copolyol.

[0022] Optionally, the polyester polyol in solution A includes one or more of the following: polycaprolactone polyol, polycarbonate diol, and polyester diol.

[0023] Optionally, the isocyanate in solution A includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, and 1,6-hexanediisocyanate.

[0024] Optionally, the polyetheramine in solution B includes one or more of the following: amino-terminated polyoxypropylene ether and amino-terminated polyoxyethylene ether.

[0025] Optionally, the chain extender in solution B includes one or more of 1,4-butanediol, 1,6-hexanediol, and trimethylolpropane.

[0026] Optionally, the additives in liquid B include one or more of leveling agents, defoamers, and wetting agents. The leveling agent is a silicone-based leveling agent, specifically a polyether-modified silicone leveling agent or a polyester-modified silicone leveling agent; the defoamer is a silicone defoamer, specifically a polydimethylsiloxane defoamer; and the wetting agent is a wetting and dispersing wetting agent.

[0027] Optionally, the ceramic hollow microspheres are made of alumina, alumina-silicon oxide, silicon carbide, boron carbide, or modified materials based on these.

[0028] The hollow glass microspheres are made of aluminosilicate or a modified material based thereon.

[0029] Secondly, the preparation method of the aforementioned sealing and protective coating includes:

[0030] Preparation method of solution A: Weigh the polyether polyol and polyester polyol and put them into a container, stir and heat to 100-180℃, keep warm for 1-2 hours and then lower the temperature of the heating container to room temperature; add isocyanate to the above solution, stir and heat to 60-90℃, keep warm for 1-2 hours to obtain solution A.

[0031] Preparation method of solution B: Weigh the pigments, fillers, polyetheramine, and chain extender and put them into a container. Stir and disperse them thoroughly. Add plasticizer, reactive diluent, additives, and flame retardant, stir and disperse them thoroughly, wet grind them, and filter them through a 100-400 mesh screen to obtain solution B.

[0032] Liquid A and liquid B should be packaged and stored separately. When used, they should be thoroughly mixed together to form a film with good film-forming properties and a short time to cure into a usable sealing and protective coating.

[0033] Optionally, in the preparation method of liquid A, the polyether polyol and polyester polyol are weighed and put into a container, stirred and heated to 150°C, kept at the temperature for 1 hour and then cooled to room temperature; then isocyanate is added, stirred and heated to 80°C, kept at the temperature for 2 hours to obtain liquid A.

[0034] Thirdly, the application of the aforementioned sealing and protective coatings in the sealing and protection of equipment and items.

[0035] The sealing and protective coating is applied to the surface of equipment and items by spraying, brushing or roller coating. After being applied to the surface, it can dry in the air for a short time to form a sealed protective film, which plays a sealing and protective role.

[0036] When unsealing and using equipment and items, the protective film can be removed by tearing or peeling. It can be easily torn off completely with virtually no residue and has no impact on the protected equipment and items themselves.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. The sealing and protective coating of the present invention consists of two components, liquid A and liquid B. They must be fully mixed together during construction and use to achieve good film-forming properties. Liquid A and liquid B cannot be dried and formed into a film before mixing, and therefore do not have good coating performance, storage, or ease of operation.

[0039] 2. The sealing and protective coating of this invention, when applied to the surface of the protected equipment and items, dries rapidly and cocoons into a flexible, dense, and continuous film. This film isolates the protected equipment and items from direct contact with water, air, salt spray, and other media, providing protection against contamination, stains, rust, ultraviolet rays, high and low temperatures, and harmful substances. This ensures stable long-term storage conditions and allows for immediate use. Upon opening, the coating can be quickly peeled off in one piece without damaging the original coating.

[0040] 3. This invention is applied to the protected equipment and items by spraying, brushing or roller coating. Compared with protective methods such as sealed packaging and dry air, the coating area can be larger, which is suitable for large-volume and complex equipment and items. Moreover, the construction is simple and the coating layer does not require subsequent maintenance.

[0041] 4. The sealing and protective coating of the present invention does not release toxic or harmful substances, solving the problem that solvent-based peelable protective coatings contain organic solvents and are limited in terms of application environment; by mixing the two components, liquid A and liquid B, to form a film, no heating is required, solving the problems of low material strength, complex coating process, and poor peeling effect of hot melt peelable protective coatings; it does not contain water, solving the problems of limited thickness, poor durability, and poor protection against impacts on equipment and items of water-based peelable protective coatings, and the fact that the presence of water makes water-based coatings unsuitable for the protection of metal instruments, precision electronic instruments and other equipment.

[0042] 5. The sealing and protective coating of this invention is a special functional coating, a polyurethane-type functional coating polymerized from high molecular compounds containing multiple functional groups. It is suitable for coating and protecting various materials such as metals, plastics, LCD screens, glass, and wood. The resulting protective film has high strength but relatively weak adhesion, allowing for easy peeling off in one piece, and enabling rapid unsealing of equipment and items. Detailed Implementation

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Example 1: Sealing protective coating, comprising liquid A and liquid B, with a mass ratio of liquid A to liquid B of 3:1.

[0046] Liquid A comprises the following raw materials in parts by weight: 28 parts polypropylene glycol, 20 parts polytetrahydrofuran glycol, 10 parts polycarbonate glycol, 15 parts polyester diol, 13 parts toluene diisocyanate, and 14 parts 1,6-hexanediisocyanate (total: 48 parts polyether polyol, 25 parts polyester polyol, and 27 parts isocyanate).

[0047] Liquid B comprises the following raw materials in parts by weight: 50 parts hollow microspheres, 5 parts graphene, 20 parts amino-terminated polyoxypropylene ether, 8 parts 1,4-butanediol, 4 parts plasticizer, 4 parts reactive diluent, 1 part additive, and 8 parts flame retardant. The additives include: 0.5 parts leveling agent and 0.5 parts defoamer (total: 55 parts pigments and fillers, 20 parts polyetheramine, 8 parts chain extender, 4 parts plasticizer, 4 parts reactive diluent, 1 part additive, and 8 parts flame retardant).

[0048] The plasticizer is a phthalate plasticizer.

[0049] The reactive diluent is a multifunctional reactive diluent.

[0050] The flame retardant is aluminum hydroxide or magnesium hydroxide.

[0051] The leveling agent is a silicone-based leveling agent, specifically a polyether-modified silicone leveling agent or a polyester-modified silicone leveling agent.

[0052] The defoamer is an organosilicon defoamer, specifically a polydimethylsiloxane defoamer.

[0053] The preparation method is as follows:

[0054] (1) Weigh the polyoxypropylene glycol, polytetrahydrofuran glycol, polycarbonate glycol and polyester diol and put them into the heating container. Stir at 70 rpm and heat to 150°C. Keep warm for 1 hour and then lower the temperature inside the heating container to room temperature.

[0055] (2) Add the weighed toluene diisocyanate and 1,6-hexanediisocyanate to the container in (1), stir at 150 rpm and heat to 80°C, and keep for 2 hours to obtain solution A.

[0056] (3) Add the weighed hollow microspheres, graphene, amino-terminated polyoxypropylene ether, and 1,4-butanediol to the new heating container, and stir and disperse them thoroughly at 600 rpm for 30 min.

[0057] (4) Add plasticizer, reactive diluent, leveling agent, defoamer, wetting agent and flame retardant to the container in (3), and stir and disperse at 1600 rpm. After dispersing for 30 minutes, grind and filter with a 200-mesh filter to obtain liquid B.

[0058] (5) Mix liquid A and liquid B in a 3:1 ratio, apply the mixture to the surface of the sample, and after curing, obtain the coating formed by the sealing and protective coating.

[0059] Example 2: Sealing protective coating, comprising liquid A and liquid B, with a mass ratio of liquid A to liquid B of 5:1.

[0060] Liquid A comprises the following raw materials in parts by weight: 12 parts polypropylene glycol, 8 parts tetrahydrofuran-propylene oxide copolymer glycol, 12 parts polycaprolactone polyol, 18 parts polycarbonate glycol, 23 parts diphenylmethane diisocyanate, and 27 parts 1,6-hexanediisocyanate (total: 20 parts polyether polyol, 30 parts polyester polyol, and 50 parts isocyanate).

[0061] Component B comprises the following raw materials in parts by weight: 5 parts silica aerogel, 12 parts hollow microspheres, 8 parts graphene, 35 parts amino-terminated polyoxypropylene ether, 11 parts 1,6-hexanediol, 9 parts trimethylolpropane, 3 parts plasticizer, 8 parts reactive diluent, 4 parts additives, and 5 parts flame retardant. The additives include: 2 parts leveling agent, 0.5 parts defoamer, and 1.5 parts wetting agent (total: 25 parts pigments and fillers, 35 parts polyetheramine, 20 parts chain extender, 3 parts plasticizer, 8 parts reactive diluent, 4 parts additives, and 5 parts flame retardant).

[0062] The plasticizer is a phthalate plasticizer.

[0063] The reactive diluent is a multifunctional reactive diluent.

[0064] The flame retardant is aluminum hydroxide or magnesium hydroxide.

[0065] The leveling agent is a silicone-based leveling agent, specifically a polyether-modified silicone leveling agent or a polyester-modified silicone leveling agent.

[0066] The defoamer is an organosilicon defoamer, specifically a polydimethylsiloxane defoamer.

[0067] The wetting agent is a wetting and dispersing wetting agent.

[0068] The preparation method is as follows:

[0069] (1) Weigh the polyoxypropylene glycol, tetrahydrofuran-propylene oxide copolymer glycol, polycaprolactone polyol and polycarbonate glycol and put them into the heating container. Stir at 70 rpm and heat to 100°C. Keep warm for 2 hours and then lower the temperature inside the heating container to room temperature.

[0070] (2) Add the weighed diphenylmethane diisocyanate and 1,6-hexane diisocyanate to the container in (1), stir at 150 rpm and heat to 60°C, and keep for 2 hours to obtain solution A.

[0071] (3) Add the weighed silica aerogel, hollow microspheres, graphene, amino-terminated polyoxypropylene ether, and 1,4-butanediol to the new heating container, and stir and disperse them thoroughly at 600 rpm for 30 min.

[0072] (4) Add the weighed plasticizer, reactive diluent, leveling agent, defoamer, wetting agent and flame retardant to the container in (3), and stir and disperse them thoroughly at 1600 rpm. After dispersing for 30 minutes, grind them and filter them with a 200-mesh filter to obtain liquid B.

[0073] (5) Mix liquid A and liquid B in a 5:1 ratio, apply the mixture to the surface of the sample, and after curing, obtain the coating formed by the sealing and protective coating.

[0074] Example 3: Sealing protective coating, comprising liquid A and liquid B, with a mass ratio of liquid A to liquid B of 8:1.

[0075] Liquid A comprises the following raw materials in parts by weight: 25 parts of polytetrahydrofuran diol, 35 parts of tetrahydrofuran-propylene oxide copolymer diol, 13 parts of polycaprolactone polyol, 7 parts of polyester diol, 10 parts of toluene diisocyanate, and 10 parts of diphenylmethane diisocyanate (total: 60 parts of polyether polyol, 20 parts of polyester polyol, and 20 parts of isocyanate).

[0076] Component B comprises the following raw materials in parts by weight: 5 parts silica aerogel, 10 parts hollow microspheres, 8 parts titanium dioxide, 6 parts graphene, 8 parts amino-terminated polyoxypropylene ether, 7 parts amino-terminated polyethylene oxide ether, 12 parts 1,4-butanediol, 13 parts trimethylolpropane, 8 parts plasticizer, 3 parts reactive diluent, 5 parts additives, and 15 parts flame retardant. The additives include: 2 parts leveling agent, 1 part defoamer, and 2 parts wetting agent (total: 29 parts pigments and fillers, 15 parts polyetheramine, 25 parts chain extender, 8 parts plasticizer, 3 parts reactive diluent, 5 parts additives, and 15 parts flame retardant).

[0077] The plasticizer is a phthalate plasticizer.

[0078] The reactive diluent is a multifunctional reactive diluent.

[0079] The flame retardant is aluminum hydroxide or magnesium hydroxide.

[0080] The leveling agent is a silicone-based leveling agent, specifically a polyether-modified silicone leveling agent or a polyester-modified silicone leveling agent.

[0081] The defoamer is an organosilicon defoamer, specifically a polydimethylsiloxane defoamer.

[0082] The wetting agent is a wetting and dispersing wetting agent.

[0083] The preparation method is as follows:

[0084] (1) Weigh the polytetrahydrofuran diol, tetrahydrofuran-propylene oxide copolymer diol, polycaprolactone polyol and polyester diol and put them into the heating container. Stir at 70 rpm and heat to 180°C. Keep warm for 1 hour and then lower the temperature inside the heating container to room temperature.

[0085] (2) Add the weighed toluene diisocyanate and diphenylmethane diisocyanate to the container in (1), stir at 150 rpm and heat to 60°C, and keep for 2 hours to obtain solution A.

[0086] (3) Add the weighed silica aerogel, hollow microspheres, titanium dioxide, graphene, amino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, 1,4-butanediol, and trimethylolpropane to a new heating container, and stir and disperse them thoroughly at 600 rpm for 30 min.

[0087] (4) Add the weighed plasticizer, reactive diluent, leveling agent, defoamer, wetting agent and flame retardant to the container in (3), and stir and disperse them thoroughly at 1600 rpm. After dispersing for 30 minutes, grind them and filter them with a 200-mesh filter to obtain liquid B.

[0088] (5) Mix liquid A and liquid B in a ratio of 8:1, apply the mixture to the surface of the sample, and after curing, obtain the coating formed by the sealing and protective coating.

[0089] Comparative Example 1: Commercially available coating JEK-205 acrylic polyurethane topcoat. This coating is made of aliphatic polyurethane, hydroxyl-containing synthetic resin, pigments, fillers, additives and solvents, and is a common weather-resistant topcoat.

[0090] Comparative Example 2, the raw materials for the peelable coating of Comparative Example 2 comprise the following parts by weight:

[0091]

[0092] This formulation is a water-based peelable coating. Its peel strength is less than that of Examples 1-3, but its elongation at break is also less than that of Examples 1-3. This results in a brittle coating that does not have high ductility, flexibility and plasticity, and is prone to cracking under high tensile force.

[0093] The preparation method of this water-based peelable coating is as follows:

[0094] (1) Add deionized water and waterborne polyurethane resin into the reactor in sequence, adjust the stirring speed to 100-200 rpm, and continue stirring for 5-15 minutes.

[0095] (2) Add the co-solvent into the reaction vessel and stir at 100-200 rpm for 1-5 min.

[0096] (3) Add the pH adjuster into the reactor to adjust the pH of the solution to 7.5-8.5, adjust the stirring speed to 300-500 rpm, and continue stirring for 5-10 minutes.

[0097] (4) Add wetting agent, defoamer, thickener and stripping accelerator into the reactor, adjust the stirring speed to 500-800 rpm and stir continuously for 10-20 min; after filtration, the final product is obtained.

[0098] Example 4

[0099] The coatings obtained in Examples 1 to 3 were subjected to performance tests and compared with Comparative Examples 1 and 2. The results are shown in Table 1.

[0100] Table 1

[0101]

[0102]

[0103] In this invention, the polyether polyol in liquid A contains ether bonds (—R—O—R—) in its main chain and more than two hydroxyl groups (—OH) in its end groups or side groups.

[0104] Polyester polyols contain a large number of polar groups such as ester and amino groups, resulting in strong cohesive strength and adhesion, as well as high strength and abrasion resistance.

[0105] Isocyanates include monoisocyanates (R—N=C=O) and diisocyanates (O=C=N—R—N=C=O). Due to the presence of unsaturated bonds in their structure, isocyanates are highly reactive and readily react with organic or inorganic substances containing active groups (such as hydroxyl, amino, and carboxyl groups).

[0106] The polyetheramine in solution B is a polymer with a polyether backbone and amine groups as terminal active functional groups. The amine groups provide polyetheramine with the possibility of reacting with various compounds, and its unique molecular structure gives it excellent overall performance. The chain extender is a low-molecular-weight, multifunctional compound containing hydroxyl or amino groups. Through reaction with polyetheramine, it forms "bridges" between molecular chains, diffusing and extending the molecular chains, increasing molecular weight, and improving the viscosity of the system.

[0107] The aerogel in liquid B is a highly dispersed solid nanoscale material composed of colloidal particles or polymer molecules aggregated into a nanoporous network structure, with gaseous dispersion medium filling the pores. It features low thermal conductivity, low density, high porosity, and large specific surface area. In the fabrication process, a liquid silicon compound is mixed with a rapidly evaporating liquid solvent to form a gel. The gel is then placed in a pressure vessel and pressurized to expel the liquid, resulting in a porous, disordered, low-density aerogel material with a continuous nanoscale network structure.

[0108] Specifically, hollow microspheres have the characteristics of light weight, oleophilicity, good flowability, heat insulation, sound insulation, electrical insulation, and low oil absorption. As a closed hollow sphere, it forms a microscopic independent heat insulation cavity, which effectively improves the thermal insulation of the coating.

[0109] Titanium dioxide can highly reflect infrared radiation from sunlight (the main source of heat), preventing the accumulation of solar heat on the coating surface. The addition of the aforementioned heat-insulating filler can effectively improve the coating's heat insulation performance.

[0110] After oxidation, graphene oxide retains the layered structure of graphite. As a high-performance new carbon material, it has a high specific surface area and abundant functional groups. Using layered graphene oxide can not only improve the mechanical properties and corrosion resistance of coatings, but also reduce the surface energy of coatings, improve application effects, and make the coating easy and quick to peel off.

[0111] Chain extenders, also known as chain growth agents, extend molecular chains and increase molecular weight through a reaction, thereby improving the mechanical and processing properties of products, ensuring extensibility, and imparting a certain tensile strength to the coating.

[0112] Plasticizers, as additives to polymer materials, can effectively improve the performance of polymer materials and enhance the flexibility of coatings.

[0113] Reactive diluents are substances with epoxy functional groups in their molecular structure. They can dissolve or disperse film-forming substances and participate in the film-forming reaction during the coating film-forming process, forming non-volatile components that remain in the coating film, thus maintaining the coating's performance and also playing a toughening role.

[0114] When liquid A and liquid B are mixed, the amino groups in the material react with the isocyanates to form a polyurea coating, which has excellent properties.

[0115] Using layered graphene oxide fillers can not only improve the mechanical properties and corrosion resistance of coatings, but also reduce the surface energy of coatings, improve application effects, and make the coating easy and quick to peel off.

[0116] The sealing and protective coating of this invention is a special functional coating, a polyurethane-type functional coating polymerized from high molecular compounds containing multiple functional groups. It is suitable for coating and protecting various materials such as metals, plastics, liquid crystal displays, glass, and wood.

[0117] The coating dries quickly and cocoons upon application to the surface of protected equipment and items, forming a flexible, dense, and continuous film. This film isolates the equipment and items from direct contact with water, air, salt spray, and other media, providing protection against contamination, stains, rust, UV rays, extreme temperatures, and harmful substances. This ensures stable long-term storage conditions and allows for immediate use. Upon opening, the coating can be quickly peeled off in one piece without damaging the original coating.

[0118] Sealing protective coatings solve the problems of solvent-based peelable protective coatings containing organic solvents, which limit their application environment; they also solve the problems of hot-melt peelable protective coatings having low material strength, complex coating processes, and poor peeling effect; and they address the issues of water-based peelable protective coatings having limited thickness, poor durability, and poor protection against impacts on equipment and items, while the presence of water makes water-based coatings unsuitable for protecting metal instruments, precision electronic instruments, and other equipment.

[0119] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sealing and protective coating, characterized in that, It includes the following components: liquid A and liquid B, with a mass ratio of liquid A to liquid B of 3:1 to 8:1; Liquid A comprises the following raw materials in parts by weight: 20-60 parts of polyether polyol, 20-30 parts of polyester polyol, and 20-50 parts of isocyanate. The B solution comprises the following raw materials in parts by weight: 25-55 parts pigments and fillers, 15-35 parts polyetheramine, 8-25 parts chain extender, 3-8 parts plasticizer, 3-8 parts reactive diluent, 1-5 parts additives, and 5-15 parts flame retardant. The pigments and fillers include hollow microspheres and graphene; the amount of hollow microspheres is ≥10 parts, and the amount of graphene is ≥5 parts; The additives include one or more of leveling agents, defoamers, and wetting agents.

2. The sealing and protective coating as described in claim 1, characterized in that, The polyether polyol includes one or more of polypropylene oxide diol, polytetrahydrofuran diol, and tetrahydrofuran-propylene oxide copolydiol.

3. The sealing and protective coating as described in claim 1, characterized in that, The polyester polyol includes one or more of the following: polycaprolactone polyol, polycarbonate diol, and polyester diol.

4. The sealing and protective coating as described in claim 1, characterized in that, The isocyanate includes one or more of toluene diisocyanate, diphenylmethane diisocyanate, and 1,6-hexanediisocyanate.

5. The sealing and protective coating as described in claim 1, characterized in that, The polyetheramine includes one or more of the following: amino-terminated polyoxypropylene ether and amino-terminated polyoxyethylene ether.

6. The sealing and protective coating as described in claim 1, characterized in that, The chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, and trimethylolpropane.

7. The sealing and protective coating as described in claim 1, characterized in that, The plasticizer is a phthalate plasticizer.

8. The sealing and protective coating as described in claim 1, characterized in that, The reactive diluent is a multifunctional reactive diluent.

9. The sealing and protective coating as described in claim 1, characterized in that, The flame retardant is aluminum hydroxide or magnesium hydroxide.

10. The sealing and protective coating as described in claim 1, characterized in that, The leveling agent is an organosilicon-based leveling agent.

11. The sealing and protective coating as described in claim 1, characterized in that, The defoamer is an organosilicone defoamer.

12. The sealing and protective coating as described in claim 1, characterized in that, The wetting agent is a wetting and dispersing wetting agent.

13. The sealing and protective coating as described in claim 10, characterized in that, The leveling agent is a polyether-modified silicone leveling agent or a polyester-modified silicone leveling agent.

14. The sealing and protective coating as described in claim 11, characterized in that, The defoamer is a polydimethylsiloxane-based defoamer.

15. The sealing and protective coating as described in claim 1, characterized in that, The hollow microspheres are ceramic hollow microspheres and / or glass hollow microspheres, with a particle size of 60-120 μm and a shatter resistance strength >15 MPa; The ceramic hollow microspheres are made of one or more of alumina, alumina-silicon oxide, silicon carbide, and boron carbide, or modified materials based on these materials. The hollow glass microspheres are made of aluminosilicate glass, or a modified material based thereon. The graphene is graphene oxide.

16. The sealing and protective coating as described in claim 1, characterized in that, The pigments and fillers include silica aerogel and / or titanium dioxide.

17. The sealing and protective coating as described in claim 16, characterized in that, The silica aerogel has a particle size of 10–30 μm and a pore diameter of 20–50 nm. The titanium dioxide is rutile titanium dioxide modified with aluminum surface, with a solar reflectance ≥80%.

18. A method for preparing a sealing and protective coating as described in any one of claims 1-17, characterized in that, include: Weigh the polyether polyol and polyester polyol and put them into a container. Stir and heat to 100-180°C. Keep warm for 1-2 hours and then lower the temperature of the heating container to room temperature. Add isocyanate to the above solution, stir and heat to 60-90°C. Keep warm for 1-2 hours to obtain solution A. After weighing the pigments, fillers, polyetheramine, and chain extender, put them into a container and stir and disperse them thoroughly. Then add the plasticizer, reactive diluent, additives, and flame retardant, stir and disperse them thoroughly, wet grind them, and filter them through a 100-400 mesh screen to obtain solution B. Solution A and solution B should be packaged and stored separately, and mixed together before use.

19. The preparation method according to claim 18, characterized in that: After weighing the polyether polyol and polyester polyol, put them into a container, stir and heat to 150°C, keep warm for 1 hour and then cool to room temperature; then add isocyanate, stir and heat to 80°C, keep warm for 2 hours to obtain solution A.

20. The application of a sealing and protective coating as described in any one of claims 1-17 and / or a preparation method as described in any one of claims 18-19 in the sealing and protection of equipment and articles, characterized in that, The sealing and protective coating is applied to the surface of equipment and items by spraying, brushing or roller coating to form a sealed protective film; When opening and using equipment and items, remove the protective film by tearing or peeling it off.

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