Coating, preparation method thereof and electrical equipment

Abstract

The invention provides a coating and a preparation method thereof and electrical equipment, and the coating comprises vinyl cyclic siloxane, polysiloxane and vinyl octa-silsesquioxane, and the coating is cured through electron beams.

Description

Technical Field

[0001] This application relates to the field of chemical materials technology, and in particular to a coating, its preparation method, and power equipment. Background Technology

[0002] In applications involving electrical equipment containing silicone rubber, such as composite insulators (silicone rubber skirts), a coating material needs to be applied to the surface of the silicone rubber to meet usage requirements. The surface coating typically needs to possess superhydrophobic and bird-repellent properties to improve the equipment's weather resistance and lifespan. Traditional coating curing usually requires heating or the addition of solvents and initiators, a time-consuming and complex process.

[0003] Therefore, there are still many problems in the preparation or use of coatings that need to be improved. Summary of the Invention

[0004] This application addresses the aforementioned issues and aims to provide a coating that requires no solvent or initiator and employs a non-heat-curing process, enabling rapid curing and thus improving production efficiency and reducing process complexity. This application also provides a method for preparing the coating, a composite insulator, and electrical equipment.

[0005] This application provides a coating comprising at least: vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane, wherein the coating is cured by electron beam.

[0006] The vinyl octasilyl silsesquioxane in the embodiments of this application is a vinyl-containing structure that can act as a nucleating agent during the coating preparation process. The vinyl groups contained therein can form bonds with the vinyl groups contained in the vinyl cyclic siloxane during the coating preparation process, thereby reducing the radiation dose during electron beam curing and increasing the curing speed.

[0007] The curing process of the coating provided in this application embodiment is achieved by electron beam curing. Electron beam curing is an ultra-fast, solvent-free, initiator-free, non-heating curing process with great advantages, which can effectively increase the curing rate of the coating.

[0008] In any embodiment, the vinyl cyclic siloxane is selected from 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, the polysiloxane is selected from polydimethylsiloxane, and the vinyl octasilsesquioxane is selected from octavinyloctasilsesquioxane. When the vinyl octasilsesquioxane is selected from octavinyloctasilsesquioxane, the bonding effect between the vinyl groups contained in the vinyl octasilsesquioxane and the vinyl groups contained in the vinyl cyclic siloxane during the coating preparation process has a significant effect on improving the curing speed of the coating under electron beam, thus facilitating rapid curing of the coating under electron beam irradiation.

[0009] In any embodiment, the mass ratio of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane ranges from (60%–70%):(25%–35%):(1%–10%), and optionally from (62%–68%):(27%–33%):(3%–8%). When the mass ratio of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane is within the above range, the obtained coating can reduce the irradiation curing dose, increase the curing speed, and also have good surface uniformity, good adhesion, and abrasion resistance.

[0010] In any embodiment, the curing time of the coating is in the range of 0.05s to 30s. The coating provided in this application has a fast curing rate, which helps to improve production efficiency.

[0011] In any embodiment, the coating further includes a functional material; or, the coating is loaded with a functional structure; the functional structure may have the same or different function as the functional material; optionally, the ratio of the mass of the functional material to the mass of the coating ranges from 10% to 25%. The coating provided in this application embodiment, while achieving its coating function, can also have additional functions by adding functional materials or loading functional structures, which helps to improve multiple performance characteristics and service life during use.

[0012] In any embodiment, the functional material includes at least one of a hydrophobic agent or a bird repellent, wherein the hydrophobic agent includes at least nano-silica; or, the functional structure includes at least hollow microspheres impregnated with a bird repellent. Thus, the coating can achieve multiple functions, specifically including superhydrophobic and bird repellent functions, to improve the weather resistance and service life of devices including the coating of this application.

[0013] The second aspect of this application also provides a method for preparing the coating of the first aspect of this application, the method comprising:

[0014] Vinyl cyclic siloxane, polysiloxane and vinyl octasilsesquioxane are placed in a mixing container and mixed to obtain a homogeneous liquid;

[0015] The uniformly mixed liquid is coated onto the surface of the material to be treated;

[0016] The liquid located on the surface of the material to be treated is subjected to an electron beam curing operation to obtain the coating.

[0017] The coating preparation method of this application involves first mixing multiple materials evenly, then coating them on the surface of the material to be treated to complete the pre-curing steps, and then rapidly achieving the curing process by electron beam curing.

[0018] In any embodiment, vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane are placed in a mixing container and mixed to obtain a homogeneous liquid, including:

[0019] Vinyl cyclic siloxane, polysiloxane and vinyl octasilsesquioxane are placed in a mixing container and stirred for 3 min to 10 min to obtain a uniformly mixed liquid;

[0020] The process of curing the liquid on the surface of the material to be treated to obtain the coating includes:

[0021] The coating is obtained by irradiation using an electron accelerator under a nitrogen atmosphere.

[0022] This application can obtain a uniformly mixed liquid through stirring, which helps to obtain a coating with better uniformity after subsequent electron beam curing.

[0023] In any embodiment, the material to be treated includes silicone rubber. The coating provided in this disclosure, after being coated with silicone rubber as a substrate, can achieve rapid curing under electron beam irradiation.

[0024] A third aspect of this application also provides an electrical device, the surface of which is provided with a coating of the first aspect of this application, or the surface of which is provided with a coating prepared by the method of the second aspect of this application. Attached Figure Description

[0025] Figure 1 SEM images of silicone rubber provided in this application;

[0026] Figure 2 This is an SEM image of the coating provided in Embodiment 4 of this application;

[0027] Figure 3This is an SEM image of the coating provided in Embodiment 2 of this application;

[0028] Figure 4 This is an SEM image of the coating provided in Embodiment 3 of this application;

[0029] Figure 5 This is an SEM image of the coating provided in Embodiment 5 of this application;

[0030] Figure 6 The following are photographs of the surface after coating curing provided in some comparative examples and some embodiments of this application; wherein, (1) is a photograph of the surface after coating curing provided in comparative example 1 of this application, (2) is a photograph of the surface after coating curing provided in embodiment 6 of this application, (3) is a photograph of the surface after coating curing provided in embodiment 1 of this application, and (4) is a photograph of the surface after coating curing provided in embodiment 7 of this application. Detailed Implementation

[0031] The following detailed description, with appropriate reference to the accompanying drawings, discloses embodiments of the coating and its preparation method, composite insulators, and power equipment of this application. However, unnecessary details may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided for the purpose of enabling those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0032] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0033] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0034] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0035] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0036] Unless otherwise specified, the terms used in this application have the common meanings as commonly understood by those skilled in the art.

[0037] Unless otherwise specified, the values ​​of the parameters mentioned in this application can be determined using various testing methods commonly used in the art, for example, according to the testing methods given in this application.

[0038] Composite insulators are widely used and play an important role in power equipment. To improve their weather resistance and service life, a coating material is usually applied to their surface. Traditional coatings typically require heating during the curing process or the addition of solvents and various initiators to achieve the desired curing effect. This process is time-consuming and complex, often resulting in low production efficiency or poor performance.

[0039] Electron beam curing, as an ultra-fast, solvent-free, initiator-free, non-heating curing process, has great advantages. However, due to the high cost of electron beam curing equipment and the long development cycle of coating formulations, the application of electron beam curing technology on silicone rubber surfaces is still immature.

[0040] Based on this, this application proposes a coating, a method for preparing the same, and an electrical device thereof. The following detailed description is provided in conjunction with the accompanying drawings.

[0041] This application proposes a coating comprising at least vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane, wherein the coating is cured by electron beam.

[0042] The coating of this application includes a polysiloxane that, after curing, becomes an elastomer material with good flexibility. This elastomer can, to a certain extent, increase the coating's resistance to high and low temperatures, aging, and weathering. The vinyl octasilyl silsesquioxane in the embodiments of this application has a vinyl-containing structure and can act as a nucleating agent during coating preparation. The vinyl groups contained in vinyl octasilyl silsesquioxane can form bonds with the vinyl groups contained in vinyl cyclic siloxanes during coating preparation, thereby reducing the radiation dose during electron beam curing and increasing the curing speed.

[0043] The curing process of the coating provided in this application embodiment is applicable to coatings that are cured by electron beam curing. Electron beam curing is an ultra-fast, solvent-free, and initiator-free non-heating curing process. In other words, this application can achieve a rapid curing effect without the addition of crosslinking agents or photoinitiators, which has great advantages and can effectively improve the curing rate of coatings, production efficiency, and simplify the process.

[0044] In some implementations, the coating may be applied to silicone rubber, but is not limited thereto, and may be any other suitable material. Figure 1 The images provided in this application are SEM images of silicone rubber. The left and right images are SEM images of the same sample at different magnifications, with corresponding scale bars of 100 μm and 50 μm, respectively.

[0045] In some embodiments, the vinyl cyclic siloxane is selected from tetramethyltetravinylcyclotetrasiloxane, i.e., 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane; the polysiloxane is selected from polydimethylsiloxane; and the vinyl octasilsesquioxane is selected from octavinyl-octasilsesquioxane (PSS-Octavinyl substituted).

[0046] Poly(dimethylsiloxane)PDMS is a high molecular weight polymer. In some embodiments, poly(dimethylsiloxane)PDMS may include at least one of a variety of end-capped poly(dimethylsiloxane), such as trimethylsiloxane-terminated poly(dimethylsiloxane) ((CH3)3SiO(Si(CH3)2O)nSi(CH3)3), vinyl-terminated poly(dimethylsiloxane), hydroxyl-terminated poly(dimethylsiloxane), triethoxysilylethyl-terminated poly(dimethylsiloxane), etc.

[0047] In some embodiments, the degree of polymerization n of polydimethylsiloxane ranges from 150 to 1500 (inclusive), for example, 250, 350, 500, 600, 750, 850, 900, 950, 970, 1000, 1100, 1200, 1300, 1400, etc. Optionally, the value of n can be between 150 and 500, between 500 and 1000, between 1000 and 1500, etc.

[0048] In some embodiments, the mass ratio of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane ranges from (60% to 70%):(25% to 35%):(1% to 10%), and optionally from (62% to 68%):(27% to 33%):(3% to 8%).

[0049] Here, the mass ratio of the vinyl cyclic siloxane to the sum of the masses of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, etc.; the mass ratio of the polysiloxane to the sum of the masses of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.; and the mass ratio of the vinyl octasilsesquioxane to the sum of the masses of the vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%.

[0050] like Figures 2 to 5 As shown, Figures 2 to 5 SEM images of the coatings provided in some embodiments of this application; the testing instrument can be a field emission scanning electron microscope (FEI) model Nova NanoSEM 450. The left and right images in each figure are SEM images of the same sample at different magnifications. Figure 2 (Corresponding to Embodiment 4 in the following Embodiments section) and Figure 5 (As described in Example 5 of the subsequent embodiments section), when the content of vinyl cyclic siloxane is high, vinyl octasilsesquioxane will be suspended on the surface of the coating, resulting in poor wear resistance of the cured coating. Conversely, when the content of vinyl cyclic siloxane is low, the content of polysiloxane will be relatively high, which can easily lead to agglomeration of vinyl octasilsesquioxane and also adversely affect the wear resistance of the cured coating. When the mass ratio of vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane is within the above range, such as... Figure 3 and Figure 4 As shown, the obtained coating can have good surface uniformity, good adhesion and wear resistance.

[0051] At the same time, such as Figure 6 As shown in Figure 1, when the content of vinyloctasilyl sesquioxane is within a suitable range, the resulting coating can reduce the irradiation curing dose, increase the curing speed, and also have good surface uniformity, 5B-level adhesion, and good abrasion resistance.

[0052] Understandably, in terms of appearance, when the content of vinyl octasilyl silsesquioxane is too high, it is easy for the octavinyl octasilyl silsesquioxane to agglomerate, which can easily lead to an uneven surface and poor surface consistency. In addition, the overall hardness of the coating increases after adding too many solid particles, which reduces its impact resistance. On the other hand, when the content of vinyl octasilyl silsesquioxane is too low or does not contain vinyl octasilyl silsesquioxane, the reduction in the irradiation dose required for coating curing is limited due to the lack of nucleating agents, making it difficult to improve the curing speed.

[0053] In some embodiments, the mass ratio between the vinyl cyclic siloxane, the polysiloxane, and the vinyl octasilsesquioxane can be the two endpoints of the above range, or any value between the two endpoints, such as: 60:35:5, 65:30:5, 70:25:5, ((65 / 95)*98:((30 / 95)*98):2, ((65 / 95)*99:((30 / 95)*99):1, ((65 / 95)*97:((30 / 95)*97):3, ((65 / 95)*93:((30 / 95)*93):7, ((65 / 95)*90:((30 / 95)*90):10, etc.

[0054] Understandable, through Figure 3 and Figure 4 It can be seen that when the mass ratio of the vinyl cyclic siloxane, polysiloxane and vinyl octasilsesquioxane is within the above range, vinyl octasilsesquioxane can play a good nucleating agent role in the coating. The grains formed in the coating are small in size and have good distribution consistency. The diameter of the linear structures in the network structure obtained after the connection between the materials is small, and the coating surface will not have obvious unevenness, so the obtained coating has good surface consistency.

[0055] Meanwhile, when the mass ratio of vinyl cyclic siloxane, polysiloxane, and vinyl octasilsesquioxane is within the aforementioned range, the bonding between the silicone rubber and the polysiloxane and vinyl cyclic siloxane can effectively improve the adhesion of the coating to the silicone rubber surface. Furthermore, beyond adhesion, when the mass ratio of the three components is within the aforementioned range, the polysiloxane content is neither too high nor too low, allowing it to effectively fulfill its "carrying and encapsulating" role, contributing to excellent overall coating performance, resulting in good adhesion, abrasion resistance, and impact resistance.

[0056] In some embodiments, the curing time of the coating is in the range of 0.05 s to 30 s. The coating provided in this application has a fast curing rate, which helps to improve production efficiency.

[0057] Here, the curing time can be an endpoint value within the above range, but is not limited to it, or it can be any value within the above range, such as 0.05s, 0.1s, 0.5s, 1s, 3s, 5s, 7s, 9s, 10s, 12s, 14s, 15s, 16s, 18s, 20s, 22s, 24s, 26s, 28s, 30s, etc.

[0058] In some implementations, the coating may have the characteristics of an elastomer.

[0059] In some embodiments, the coating further includes a functional material; or, the coating is loaded with a functional structure; the functional structure may have the same or different function as the functional material; optionally, the ratio of the mass of the functional material to the mass of the coating ranges from 10% to 25% (inclusive). The coating provided in this application embodiment, while fulfilling its coating function, can also acquire additional functions by adding functional materials or loading functional structures, thus helping to improve multiple performance characteristics and service life during use.

[0060] Here, the ratio of the mass of the functional material to the mass of the coating can be 12%, 15%, 18%, 20%, 22%, or 25%, etc.

[0061] Understandably, too little functional material can lead to uneven coating distribution on the surface of the material to be coated (e.g., silicone rubber), while too much can result in excessive coating viscosity, which can reduce the wear resistance of the cured coating. However, when the mass ratio of functional material is within the aforementioned range, enhanced coating functionality can be achieved without compromising the coating's performance.

[0062] In some embodiments, the introduction of functional materials and structures can be achieved by directly adding them to the coating liquid before the curing operation, followed by the normal curing process. Thus, compared to electrostatic spraying, the method provided in this application helps to better control the thickness of the coating on the silicone rubber surface to achieve a more uniform level, which helps to achieve better electron beam penetration.

[0063] In some embodiments, the functional material includes at least one of a hydrophobic agent or a bird repellent, wherein the hydrophobic agent includes at least nano-silica; or, the functional structure includes at least hollow microspheres impregnated with a bird repellent. Thus, the coating can achieve multiple functions, specifically including superhydrophobic and bird repellent functions, to improve the weather resistance and service life of devices (including but not limited to power equipment) incorporating the coating of this application, thereby meeting the performance requirements of power equipment for coatings.

[0064] In some embodiments, the functional material may also include other types of materials, such as, but not limited to, copper oxide (CuO) nanoparticles, lanthanum oxide (La2O3) nanoparticles, boron nitride (BN) nanoparticles, or titanium dioxide (TiO2) nanoparticles, which can achieve other functions, and may also be materials that enable the coating to heat up rapidly.

[0065] Understandably, adding copper oxide (CuO) nanoparticles can provide antibacterial, antiviral, and photocatalytic properties to the coating, contributing to the creation of antibacterial, antiviral, and self-cleaning coatings. Adding lanthanum oxide (La2O3) nanoparticles can improve the optical properties, heat resistance, and UV protection of the coating, contributing to the creation of optical, UV-protective, and heat-resistant coatings. Adding boron nitride (BN) nanoparticles can provide excellent thermal conductivity and electrical insulation, as well as lubrication and wear resistance, contributing to the creation of thermal interface materials, wear-resistant coatings, and lubricating coatings. Adding titanium dioxide (TiO2) nanoparticles can provide self-cleaning and antibacterial functions, UV shielding, and photocatalytic functions to the coating, contributing to the creation of self-cleaning, UV-protective, and antibacterial coatings.

[0066] Here, the coating of this application may include vinyl cyclic siloxane, polysiloxane and the vinyl octasilsesquioxane and functional additives. By adding functional additives with superhydrophobic and bird-repellent functions, and using electron beam curing technology, ultra-fast curing of the coating can be achieved, thereby forming a uniform and weather-resistant functional coating on the surface of the material to be coated (including but not limited to silicone rubber).

[0067] This application also provides a method for preparing the above-mentioned positive electrode active material, the method comprising:

[0068] Vinyl cyclic siloxane, polysiloxane and vinyl octasilsesquioxane are placed in a mixing container and mixed to obtain a homogeneous liquid;

[0069] The uniformly mixed liquid is coated onto the surface of the material to be treated;

[0070] The liquid located on the surface of the material to be treated is subjected to an electron beam curing operation to obtain the coating.

[0071] The coating preparation method of this application involves first mixing multiple materials evenly, then coating them on the surface of the material to be treated to complete the pre-curing steps, and then rapidly achieving the curing process by electron beam curing.

[0072] In some embodiments, the vinyl cyclic siloxane is selected from 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, and the polysiloxane is selected from polydimethylsiloxane; the vinyl octasilsesquioxane is selected from octavinyloctasilsesquioxane. Poly(dimethylsiloxane)PDMS is a polymer. In some embodiments, polydimethylsiloxane may include at least one of various end-capped polydimethylsiloxanes, such as trimethylsiloxane-terminated polydimethylsiloxane ((CH3)3SiO(Si(CH3)2O)nSi(CH3)3), vinyl-terminated polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, triethoxysilylethyl-terminated polydimethylsiloxane, etc.

[0073] In some embodiments, the degree of polymerization n of polydimethylsiloxane ranges from 150 to 1500 (inclusive), for example, 250, 350, 500, 600, 750, 850, 900, 950, 970, 1000, 1100, 1200, 1300, 1400, etc. Optionally, the value of n can be between 150 and 500, between 500 and 1000, or between 1000 and 1500, etc.

[0074] In some embodiments, the average molecular weight of polydimethylsiloxane can be 115,000.

[0075] In some implementations, the mixing container may include, but is not limited to, a beaker, a metal glass bottle, a glass sample bottle, or any other suitable container.

[0076] In some implementations, the material to be treated may be silicone rubber, but is not limited thereto, and may be any other suitable material.

[0077] In some embodiments, the preparation method further includes, prior to curing the liquid on the surface of the material to be treated to obtain the coating:

[0078] Functional materials or functional structures are added to the liquid, wherein the functional structure has the same or different function as the functional material.

[0079] In some embodiments, the functional material includes at least one of a hydrophobic agent or a bird repellent, wherein the hydrophobic agent includes at least nano-silica; or, the functional structure includes at least hollow microspheres impregnated with a bird repellent.

[0080] In some embodiments, the functional material may also include other types of materials, such as, but not limited to, copper oxide (CuO) nanoparticles, lanthanum oxide (La2O3) nanoparticles, boron nitride (BN) nanoparticles, or titanium dioxide (TiO2) nanoparticles, which can achieve other functions, and may also be materials that enable the coating to heat up rapidly.

[0081] Understandably, adding copper oxide (CuO) nanoparticles can provide antibacterial, antiviral, and photocatalytic properties to the coating, contributing to the creation of antibacterial, antiviral, and self-cleaning coatings. Adding lanthanum oxide (La2O3) nanoparticles can improve the optical properties, heat resistance, and UV protection of the coating, contributing to the creation of optical, UV-protective, and heat-resistant coatings. Adding boron nitride (BN) nanoparticles can provide excellent thermal conductivity and electrical insulation, as well as lubrication and wear resistance, contributing to the creation of thermal interface materials, wear-resistant coatings, and lubricating coatings. Adding titanium dioxide (TiO2) nanoparticles can provide self-cleaning and antibacterial functions, UV shielding, and photocatalytic functions to the coating, contributing to the creation of self-cleaning, UV-protective, and antibacterial coatings.

[0082] In this way, the cured coating can acquire the properties of functional materials or structures, such as superhydrophobicity, bird-repelling function, and other properties. However, it is not limited to this; functional materials or structures can also have other functions, which will not be listed here. Specific options can be flexibly selected according to actual needs.

[0083] In some embodiments, vinyl cyclic siloxanes, polysiloxanes, and vinyloctasilsesquioxanes are placed in a mixing container and mixed to obtain a homogeneous liquid, including:

[0084] Vinyl cyclic siloxane, polysiloxane and vinyl octasilsesquioxane are placed in a mixing container and stirred for 3 min to 10 min to obtain a uniformly mixed liquid;

[0085] The process of curing the liquid on the surface of the material to be treated to obtain the coating includes:

[0086] The coating is obtained by irradiation using an electron accelerator under a nitrogen atmosphere.

[0087] This application achieves a uniformly mixed liquid through stirring, which facilitates the formation of a coating with good uniformity after subsequent electron beam curing. Furthermore, the curing process under a nitrogen atmosphere prevents the presence of other potentially reactive gases, contributing to the superior performance of the resulting coating.

[0088] In some embodiments, the stirring time can be an endpoint of the above range, but is not limited to it, and can be any value within the above range, such as 3 min, 3.5 min, 4 min, 4.5 min, 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min, 10 min, etc.

[0089] In some implementations, manual stirring can be used to obtain a uniformly mixed liquid, but it is not limited to this. Magnetic stirring or mechanical stirring can also be used. The specific method can be flexibly selected according to the actual situation, and no specific limitation is made here.

[0090] In some implementations, the electron accelerator may include, but is not limited to, an electron curtain accelerator.

[0091] In some implementations, more sophisticated equipment and control techniques can be used during the coating curing process to ensure that the cured coating has better uniformity and integrity.

[0092] In some implementations, the curing apparatus may be, for example, the EBLab-200 200keV electron accelerator from Comet GmbH, Switzerland, to perform the curing operation.

[0093] Through the above steps, an ultrafast curing coating on the surface of silicone rubber with functions such as superhydrophobicity and bird repellency can be prepared, thereby meeting the usage requirements of power equipment.

[0094] In addition, this application also provides an electrical device comprising the coating of the first aspect of this application and the coating prepared by the method of the second aspect.

[0095] In some embodiments, the power equipment includes, but is not limited to, composite insulators, silicone rubber cables, substations, dry-type reactors, transformers, and other power equipment. The coating provided in this application is used in the aforementioned power equipment for anti-icing applications on silicone rubber cables and for external insulation of power equipment, such as certain silicone rubber cables, to achieve anti-icing applications and external insulation of power equipment, serving as sheathing for substations, dry-type reactors, and transformers.

[0096] When the coating provided in this application is applied to power equipment, it can give the power equipment better performance, including but not limited to weather resistance, and also give it a longer service life to meet the usage requirements.

[0097] However, it is not limited to this. In addition to the above, the coating provided in this application can also be used on any other materials or structures that need to provide better performance, including but not limited to weather resistance, and have a longer service life. Specifically, it can be flexibly selected according to the actual situation, and no specific limitation is made here.

[0098] Example

[0099] The following describes embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.

[0100] Coating preparation

[0101] Example 1

[0102] S1: Add 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, polydimethylsiloxane (CAS No. 9016-00-6), and octavinyloctasilsesquioxane to a mixing container, wherein the mass ratio of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, polydimethylsiloxane, and octavinyloctasilsesquioxane is 65:30:5. Then, manually stir for 5 minutes to mix the above materials and obtain a homogeneous liquid.

[0103] S2: Use a coating applicator to coat the uniformly mixed liquid onto the surface of a silicone rubber sheet the size of an A4 sheet of paper, forming a liquid coating with a thickness of 150μm.

[0104] S3: Irradiate under a nitrogen atmosphere using a 200keV electron accelerator (electron curtain type), with a required dose of 120kGy and a curing time of 10s.

[0105] Examples 2-5

[0106] The coatings for each embodiment were prepared using a method similar to that of Example 1, keeping the mass ratio of octavinyloctasilsesquioxane constant. The mass ratio between 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane and polydimethylsiloxane (CAS No. 9016-00-6) was varied; please refer to Table 1 for details. In these embodiments, irradiation was performed using a 200 keV electron accelerator (electron curtain type); the required dose and curing time are shown in Table 1.

[0107] Examples 6-8

[0108] The coatings for each embodiment were prepared using a method similar to that of Example 1, with variations in material mass ratios as shown in Table 1. In these embodiments, irradiation was performed at a 200 keV electron accelerator (electron curtain type); the required dose and curing time are shown in Table 1.

[0109] Example 9

[0110] The coatings for each embodiment were prepared using a method similar to that of Example 1, with variations in the types of additives shown in Table 1. In these embodiments, irradiation was performed using a 200 keV electron accelerator (electron curtain type); the required dose and curing time are shown in Table 1.

[0111] Comparative Example 1

[0112] The preparation method is similar to that in Example 1, except that octavinyloctasilsesquioxane (octavinylPOSS) is not introduced. Irradiation is carried out in a 200keV electron accelerator (electron curtain type). The required dose and curing time are shown in Table 1.

[0113] Comparative Example 2

[0114] Similar to the preparation method in Example 1, except that octavinyloctasilsesquioxane (octavinylPOSS) is replaced with octaphenyloctasilsesquioxane (octaphenylPOSS), and irradiation is carried out in a 200keV electron accelerator (electron curtain type). The required dose and curing time are shown in Table 1.

[0115] Performance testing

[0116] The coatings obtained in the above embodiments and comparative examples were subjected to the following tests.

[0117] 1. Scanning Electron Microscope (SEM)

[0118] The coatings prepared in Examples 4, 2, 3, and 5 were analyzed using a field emission scanning electron microscope (FEI) Nova NanoSEM 450. Specific test results can be found in the respective references. Figures 2 to 5 As shown.

[0119] 2. Coating adhesion test

[0120] The adhesion of the coating was measured according to ASTM D3359 standard. First, 22 X-shaped scratches with a spacing of 1 mm were made on the coating surface with a blade. Then, the coating was peeled off with tape, and the adhesion was determined by observing the percentage of coating that peeled off. Specific test results are shown in Table 1. 3. Friction Performance Test

[0121] The abrasion resistance of the coating was verified by repeatedly rubbing its surface parallel to the ground 1000 times with 120-grit sandpaper under a 100-gram load and observing the mass loss. See Table 1 for specific test results.

[0122] 4. Impact resistance test

[0123] The impact resistance of the coating was measured according to ASTM D2794 standard. The coating was placed in a spherical impact head dropped vertically from a certain height to generate impact force. The appearance of cracks and peeling in the coating before and after the impact was observed to determine its impact resistance. Specific test results are shown in Table 1.

[0124] The test results for items 2-4 of the coatings prepared using the above examples and comparative examples are shown in Table 1 below:

[0125]

[0126] As can be seen from Table 1 above, compared with the coatings of Comparative Example 1 (without octavinyl octasilyl sesquioxane) and Comparative Example 2 (without vinyl octasilyl sesquioxane), Examples 1-9 all achieved 5B level adhesion, good abrasion resistance and impact resistance, and the irradiation dose and curing time during electron beam curing were significantly reduced.

[0127] In Examples 1 to 3 and Example 7, because the mass ratio between 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane and polydimethylsiloxane (CAS No. 9016-00-6) and octavinyloctasilsesquioxane was within a suitable range, the resulting coating not only had a reduced radiation dose and curing time during the curing process, but also achieved 5B-level adhesion, good abrasion resistance and impact resistance.

[0128] In Examples 3-4, when the mass ratio of octavinyloctasilsesquioxane was fixed, both excessively high and low mass ratios between 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane and polydimethylsiloxane (CAS No. 9016-00-6) would adversely affect the impact resistance and abrasion resistance of the coating. However, since the mass ratio of octavinyloctasilsesquioxane was within a suitable range, the irradiation dose and curing time of the coating during electron beam curing could still be significantly reduced.

[0129] In Example 6, due to the lower mass ratio of octavinyloctasilylsilsesquioxane, the reduction in irradiation dose and curing time was slightly weaker compared to Example 1. However, compared to Comparative Examples 1 and 2, it still effectively reduced irradiation dose and curing time, and achieved good performance in adhesion, abrasion resistance, and impact resistance. In Example 8, due to the excessively high mass ratio of octavinyloctasilsesquioxane, the coating's abrasion resistance and impact resistance were slightly insufficient. However, compared to Comparative Examples 1 and 2, it still showed significant advantages in reducing irradiation dose and curing time.

[0130] In Example 9, a functional material, specifically a hydrophobic agent, was added to the coating. The coating still achieved 5B level adhesion, good abrasion resistance and impact resistance. Furthermore, the irradiation dose and curing time during the electron beam curing process were significantly reduced. This demonstrates that the coating provided in this application achieves the added functions, such as hydrophobicity or bird repellency, without increasing the curing dose, curing time, or reducing its own performance.

[0131] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A coating characterized in that, The coating layer comprises at least: vinyl cyclic siloxane, polysiloxane and vinyl octasiloxane, and the coating layer is cured by electron beam.

2. The coating of claim 1, wherein, The vinyl cyclic siloxane is selected from 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, the polysiloxane is selected from polydimethylsiloxane, and the vinyl octasiloxane is selected from octavinyl octasiloxane.

3. The coating according to any one of claims 1-2, characterized in that, The mass ratio of the vinyl cyclic siloxane, the polysiloxane and the vinyl octasiloxane ranges between (60%-70%):(25%-35%):(1%-10%), or optionally, between (62%-68%):(27%-33%):(3%-8%).

4. The coating according to any one of claims 1 to 3, characterized in that The curing time of the coating layer ranges from 0.05s to 30s.

5. The coating according to any one of claims 1 to 4, characterized in that, The coating layer further comprises a functional material, or the coating layer is loaded with a functional structure, which is the same as or different from the functional material; optionally, the mass ratio of the functional material to the coating layer ranges from 10% to 25%.

6. The coating according to any one of claims 1 to 5, characterized in that, The functional material comprises at least one of a hydrophobic agent and a bird repellent agent, and the hydrophobic agent comprises at least nanosilica; or the functional structure comprises at least hollow microspheres impregnated with the bird repellent agent.

7. A method for the production of a coating as claimed in any one of claims 1 to 6, characterized in that The preparation method comprises: putting vinyl cyclic siloxane, polysiloxane and vinyl octasiloxane into a mixing container and mixing them to obtain a uniformly mixed liquid; coating the uniformly mixed liquid on the surface of a material to be treated; carrying out electron beam curing operation on the liquid on the surface of the material to be treated to obtain the coating layer.

8. The preparation method according to claim 7, characterized in that, putting vinyl cyclic siloxane, polysiloxane and vinyl octasiloxane into a mixing container and mixing them to obtain a uniformly mixed liquid, comprising: putting vinyl cyclic siloxane, polysiloxane and vinyl octasiloxane into a mixing container and mixing them by stirring for 3min-10min to obtain a uniformly mixed liquid; carrying out curing operation on the liquid on the surface of the material to be treated to obtain the coating layer, comprising: carrying out irradiation operation by an electron accelerator under nitrogen atmosphere to obtain the coating layer.

9. The production method according to claim 7 or 8, characterized by, The material to be treated comprises silicone rubber.

10. An electric power device, characterized by comprising: The power equipment comprises the coating layer according to any one of claims 1-6, or the power equipment comprises the coating layer prepared by the method according to any one of claims 7-9.

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