Composite coating, preparation method thereof and transformer bushing column head

Abstract

The invention discloses a composite coating, a preparation method thereof and a transformer bushing column head. The composite coating comprises an insulating property regulation and control layer and a reversible color-changing layer which are laminated and coated on the surface of equipment, the insulating property regulation and control layer is formed by an insulating property coating, and the reversible color-changing layer is formed by a reversible color-changing coating; the reversible color-changing layer comprises a blue reversible color-changing layer and a red reversible color-changing layer, and the blue reversible color-changing layer and the red reversible color-changing layer are not overlapped; the reversible color-changing coating comprises a blue reversible color-changing coating and a red reversible color-changing coating; the reversible color-changing coating comprises room-temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material comprises a color former, a color developing agent and a solvent; wherein for the blue reversible color-changing coating, the solvent comprises octadecanol; for the red reversible color-changing coating, the solvent comprises naphthalene. According to the technical scheme provided by the embodiment of the invention, the thermally induced defect condition of the transformer bushing column head can be sensitively and intuitively reflected.

Description

Technical Field

[0001] The invention relates to the technical field of reversible color-changing coatings, and in particular to a composite coating and a preparation method thereof, and a transformer bushing column cap. Background Art

[0002] As an important equipment in the power system, the transformer plays a key role in the power transmission and transformation process. Its operating status directly affects the reliability and safety of the power grid.

[0003] During the daily operation of the transformer, the bushing stud is the key part of the transformer's electrical connection to the outside. When the transformer is running for a long time or under high load conditions, the bushing stud may generate heat due to the passage of current, causing the temperature to rise, threatening the safety of the entire power system. However, the temperature-indicating paint for power equipment fault warning provided by the prior art has a small color change temperature range, and the color change temperature range has a low matching degree with the temperature of thermal defects on the transformer bushing stud, so it cannot sensitively and intuitively reflect the thermal defects on the transformer bushing stud. Summary of the invention

[0004] The present invention provides a composite coating and a preparation method thereof, and a transformer bushing stud, so as to solve the problem that the heat-induced defects occurring in the transformer bushing stud cannot be sensitively and intuitively reflected.

[0005] According to one aspect of the present invention, a composite coating is provided, comprising: an insulation performance regulating layer and a reversible color changing layer formed by stacking and coating on the surface of a device; the insulation performance regulating layer is formed by using an insulation performance coating, and the reversible color changing layer is formed by using a reversible color changing coating;

[0006] The reversible color-changing layer comprises a blue reversible color-changing layer and a red reversible color-changing layer, and there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer;

[0007] The reversible color-changing coating comprises a blue reversible color-changing coating and a red reversible color-changing coating; the reversible color-changing coating comprises room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material comprises a color former, a color developer and a solvent;

[0008] Wherein, for the blue reversible color-changing paint, the solvent includes octadecyl alcohol; for the red reversible color-changing paint, the solvent includes naphthalene.

[0009] Optionally, for the blue reversible color-changing coating, the color former includes crystal violet lactone, and the developer includes bisphenol A;

[0010] For the red reversible color-changing paint, the color former includes thermosensitive red, and the color developer includes bisphenol A.

[0011] Optionally, the room temperature vulcanized silicone rubber has a first preset weight fraction, and the reversible color-changing material has a second preset weight fraction;

[0012] The first preset weight portion ranges from 10 to 20 portions, and the second preset weight portion ranges from 1 to 4 portions.

[0013] Optionally, in the reversibly color-changing material, the color former has a third preset weight fraction, the developer has a fourth preset weight fraction, and the solvent has a fifth preset weight fraction;

[0014] The third preset weight portion includes 1 portion, the fourth preset weight portion includes 1 to 6 portions, and the fifth preset weight portion includes 50 to 80 portions.

[0015] Optionally, the insulation performance regulating layer is formed by an insulation performance regulating coating, and the insulation performance regulating coating comprises a base resin, a filler, a curing agent and an accelerator;

[0016] The base resin has a sixth preset weight portion, the filler has a seventh preset weight portion, the curing agent has an eighth preset weight portion, and the accelerator has a ninth preset weight portion;

[0017] The sixth preset weight portion includes 10 portions, the seventh preset weight portion includes a range of 40 to 60 portions, the eighth preset weight portion includes 8 portions, and the ninth preset weight portion includes 0.1 portions.

[0018] Optionally, the filler includes a surface-treated barium titanate material;

[0019] The base resin includes DER-331 bisphenol A epoxy resin;

[0020] The curing agent is methyltetrahydrophthalic anhydride or methylhexahydrophthalic anhydride;

[0021] The accelerator includes N,N-dimethylbenzylamine.

[0022] According to another aspect of the present invention, there is provided a method for preparing a composite coating, comprising:

[0023] An insulation performance regulating coating and a reversible color-changing coating are prepared; wherein the reversible color-changing coating comprises a blue reversible color-changing coating and a red reversible color-changing coating;

[0024] Coating the insulation performance regulating coating on the surface of the equipment and curing it to form an insulation performance regulating layer;

[0025] Applying the blue reversible color-changing paint on a first preset area on the surface of the device to form a blue reversible color-changing layer;

[0026] Applying the red reversible color-changing paint on a second preset area on the surface of the device to form a red reversible color-changing layer;

[0027] Among them, the second preset area does not overlap with the first preset area; the reversible color-changing coating includes room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material includes a colorant, a developer and a solvent; for the blue reversible color-changing coating, the solvent includes octadecyl alcohol; for the red reversible color-changing coating, the solvent includes naphthalene.

[0028] Optionally, the preparation of the insulating performance regulating coating and the reversible color changing coating comprises:

[0029] After mixing and stirring the base resin, filler and curing agent, adding an accelerator and continuing to stir, the insulating performance regulating coating is obtained;

[0030] The blue reversible color-changing material and the room temperature vulcanized silicone rubber are mixed and stirred to obtain the blue reversible color-changing coating;

[0031] The red reversible color-changing material and the room temperature vulcanized silicone rubber are mixed and stirred to obtain the red reversible color-changing coating.

[0032] Optionally, the method for preparing the reversible color-changing material comprises:

[0033] The solvent is placed in a beaker and heated and stirred until the solvent is in a molten state;

[0034] The color former and the developer are added to the solvent, and the mixture is stirred and mixed, and then cooled and ground to obtain the reversible color-changing material.

[0035] According to another aspect of the present invention, there is provided a transformer bushing stud, comprising a composite coating as described in any embodiment of the first aspect coated on a surface thereof.

[0036] The composite coating provided by the embodiment of the present invention includes an insulation performance regulating layer and a reversible color-changing layer formed by stacking and coating on the surface of the equipment, and the reversible color-changing coating forming the reversible color-changing layer includes a blue reversible color-changing coating and a red reversible color-changing coating. The solvent used in the blue reversible color-changing coating is octadecyl alcohol. When the blue reversible color-changing layer formed by coating with the blue reversible color-changing coating gradually changes from blue to colorless, it can accurately reflect that a serious thermal defect occurs in the column head of the transformer bushing. The solvent used in the red reversible color-changing coating is naphthalene. When the red reversible color-changing layer formed by coating with the red reversible color-changing coating gradually changes from red to colorless, it can accurately reflect that an emergency thermal defect occurs in the column head of the transformer bushing. And there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer arranged on the same layer, so that the color changes of the reversible color-changing layers when monitoring the serious thermal defect and / or emergency thermal defect of the transformer bushing column head will not interfere with each other, so that the composite coating can sensitively and intuitively reflect the thermal defect of the transformer bushing column head.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a schematic flow chart of a method for preparing a composite coating according to an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 Specific flow chart of step S110 in FIG. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] As described in the background technology, when the transformer is running for a long time or under high load conditions, the bushing column head may generate heat due to the passage of current, resulting in an increase in temperature. Excessive temperature will not only accelerate the aging of the bushing material, but may also cause serious faults such as insulation damage, oil leakage and even short circuit, thereby threatening the safety of the entire power system. DL / T664-2008 "Application Specification for Infrared Diagnosis of Live Equipment" stipulates that the temperatures of severe thermal defects and emergency thermal defects of transformer bushing column heads are 55°C and 80°C respectively. At present, the reversible color-changing materials disclosed in the prior art use stearic acid as a solvent, and the temperature indication range of the reversible color-changing materials is 69-77°C, which does not meet the requirements of reflecting the temperature of different degrees of thermal defects of the transformer bushing column head. The prior art also discloses a thermochromic nanofiber membrane, which includes an organic solvent, hard polyurethane particles and a nickel organic metal complex. The metal compound is selected from nickel chloride, nickel bromide, cobalt chloride or cobalt bromide. The aliphatic chain is selected from diethylamine hydrochloride, diethylamine hydrobromide, triethylamine hydrochloride or triethylamine hydrobromide. The temperature at which the color of the thermochromic nanofiber membrane changes is 70-72°C, which also does not meet the requirement of reflecting the temperature of different degrees of thermal defects of the transformer bushing column.

[0044] Based on the above technical problems, the embodiments of the present invention propose the following technical solutions.

[0045] The embodiment of the present invention provides a composite coating, which includes: an insulation performance regulating layer and a reversible color changing layer formed by stacking and coating on the surface of a device; the insulation performance regulating layer is formed by using insulation performance coating, and the reversible color changing layer is formed by using reversible color changing coating.

[0046] The reversible color-changing layer includes a blue reversible color-changing layer and a red reversible color-changing layer, and there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer.

[0047] The reversible color-changing coating includes a blue reversible color-changing coating and a red reversible color-changing coating; the reversible color-changing coating includes room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material includes a color former, a color developer and a solvent; wherein, for the blue reversible color-changing coating, the solvent includes octadecyl alcohol; and for the red reversible color-changing coating, the solvent includes naphthalene.

[0048] Specifically, by coating the insulating performance coating and the reversible color-changing coating on the surface of the equipment, a stacked insulating performance regulating layer and a reversible color-changing layer are formed, that is, a composite coating is formed on the surface of the equipment. Among them, the insulating performance regulating layer is used to achieve good insulation between the composite coating and the equipment, thereby ensuring the safe and stable operation of the power equipment. The reversible color-changing layer includes a blue reversible color-changing layer and a red reversible color-changing layer, and the blue reversible color-changing layer and the red reversible color-changing layer are coated on different areas of the surface of the equipment, so that the blue reversible color-changing layer and the red reversible color-changing layer do not overlap in the vertical direction. The working principle of the reversible color-changing layer is as follows: when the temperature on the surface of the device does not reach the lowest temperature that the reversible color-changing layer can perceive, the reversible color-changing layer presents its own corresponding color; when the temperature on the surface of the device rises to the point where it begins to enter the temperature range that the reversible color-changing layer can perceive, the color of the reversible color-changing layer begins to fade until it becomes colorless; when the temperature on the surface of the device is higher than the highest temperature that the reversible color-changing layer can perceive, the reversible color-changing layer remains colorless; when the thermal defects of the device are eliminated and the surface temperature drops to less than the highest temperature that the reversible color-changing layer can perceive, the reversible color-changing layer begins to restore its own corresponding color, and as the surface temperature continues to drop, the color of the reversible color-changing layer gradually deepens until the temperature on the surface of the device drops to less than the lowest temperature that the reversible color-changing layer can perceive, and the reversible color-changing layer presents its own color. Therefore, the composite coating provided by the embodiment of the present invention is reusable, and the color change is a reversible change.

[0049] The reversible color-changing layer in the composite coating includes a blue reversible color-changing layer and a red reversible color-changing layer. The blue reversible color-changing coating used in the blue reversible color-changing layer uses octadecyl alcohol as a solvent, so that the composite coating can sense when the temperature of the equipment surface is in the range of 49 to 56°C, that is, the blue color of the blue reversible color-changing layer will become lighter when the temperature of the equipment surface rises to the temperature range of 49 to 56°C. The temperature range sensed by the blue reversible color-changing layer includes the temperature corresponding to the occurrence of serious thermal defects in the transformer bushing column head, that is, 55°C. Therefore, the composite coating including the blue reversible color-changing layer can sensitively and intuitively reflect whether the equipment has serious thermal defects, providing an intuitive basis for the staff to monitor. The red reversible color-changing coating used in the red reversible color-changing layer uses naphthalene as a solvent, so that the composite coating can sense when the temperature of the equipment surface is in the range of 79 to 81°C, that is, the red color of the red reversible color-changing layer will become lighter when the temperature of the equipment surface rises to the temperature range of 79 to 81°C. The temperature range sensed by the red reversible color-changing layer includes the temperature corresponding to the emergency heat-induced defect of the transformer bushing column head, that is, 80°C. Therefore, the composite coating including the red reversible color-changing layer can sensitively and intuitively reflect whether the equipment has an emergency heat-induced defect, thereby intuitively warning the staff. In this way, the composite coating has two color-changing temperature ranges, and the temperature sensing range of the equipment surface is relatively large.

[0050] In addition, since there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer located in the same layer in the composite coating, the blue reversible color-changing layer and the red reversible color-changing layer will not interfere with each other when the color changes according to the temperature of the device surface, so that the color changes corresponding to serious thermal defects and emergency thermal defects of the device are accurate and clear.

[0051] The composite coating provided by the embodiment of the present invention includes an insulation performance regulating layer and a reversible color-changing layer formed by stacking and coating on the surface of the equipment, and the reversible color-changing coating forming the reversible color-changing layer includes a blue reversible color-changing coating and a red reversible color-changing coating. The solvent used in the blue reversible color-changing coating is octadecyl alcohol. When the blue reversible color-changing layer formed by coating with the blue reversible color-changing coating gradually changes from blue to colorless, it can accurately reflect that a serious thermal defect occurs in the column head of the transformer bushing. The solvent used in the red reversible color-changing coating is naphthalene. When the red reversible color-changing layer formed by coating with the red reversible color-changing coating gradually changes from red to colorless, it can accurately reflect that an emergency thermal defect occurs in the column head of the transformer bushing. And there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer arranged on the same layer, so that the color changes of the reversible color-changing layers when monitoring the serious thermal defect and / or emergency thermal defect of the transformer bushing column head will not interfere with each other, so that the composite coating can sensitively and intuitively reflect the thermal defect of the transformer bushing column head.

[0052] Optionally, based on the above embodiment, for the blue reversible color-changing coating, the colorant includes crystal violet lactone, and the color developer includes bisphenol A; for the red reversible color-changing coating, the colorant includes thermosensitive red, and the color developer includes bisphenol A.

[0053] Specifically, the colorant is a raw material used to provide color in the reversible color-changing paint. Crystal violet lactone is used as a colorant in the blue reversible color-changing paint to show blue; thermosensitive red is used as a colorant in the red reversible color-changing paint to show red. The color developer is a raw material used in the reversible color-changing paint to show the color of the colorant itself. The color developers used in the blue reversible color-changing paint and the red reversible color-changing paint are both bisphenol A, and the proportion of the color developer in the reversible color-changing paint has a certain influence on the color depth displayed by the reversible color-changing paint. The proportion of the color developer can be adjusted according to actual needs.

[0054] Optionally, based on the above embodiments, the room temperature vulcanized silicone rubber has a first preset weight portion, and the reversible color-changing material has a second preset weight portion; the first preset weight portion ranges from 10 to 20 portions, and the second preset weight portion ranges from 1 to 4 portions.

[0055] For example, the insulating performance regulating coating and the reversible color-changing coating used in the embodiment of the present invention both use weight parts to express the component ratio of the coating, and the weight of 1 part can be 1 gram. The reversible color-changing coating is mixed with room temperature vulcanized silicone rubber and a reversible color-changing material; wherein the room temperature vulcanized silicone rubber is a transparent, colorless, durable, anti-fouling flashover composite coating, which has no effect on the color development and color change of the reversible color-changing material, and can keep the color development effect of the reversible color-changing coating good. The first preset weight parts of the room temperature vulcanized silicone rubber in the reversible color-changing coating can be 10 to 20 parts, and the second preset weight parts of the reversible color-changing material in the reversible color-changing coating can be 1 to 4 parts. The reversible color-changing material is mixed with a color former, a color developer and a solvent; the third preset weight portion of the color former in the reversible color-changing material can be 1 part, the fourth preset weight portion of the color developer in the reversible color-changing material can be 1 to 6 parts, and the fifth preset weight portion of the solvent in the reversible color-changing material can be 50 to 80 parts. The reversible color-changing coating obtained according to such a component ratio can sensitively and intuitively reflect the occurrence of serious thermal defects or emergency thermal defects in the transformer bushing column.

[0056] Optionally, based on the above embodiments, the insulation performance regulating layer is formed by using an insulation performance regulating coating, and the insulation performance regulating coating includes a base resin, a filler, a curing agent and an accelerator.

[0057] The base resin has a sixth preset weight portion, the filler has a seventh preset weight portion, the curing agent has an eighth preset weight portion, and the accelerator has a ninth preset weight portion; the sixth preset weight portion includes 10 portions, the seventh preset weight portion ranges from 40 to 60 portions, the eighth preset weight portion includes 8 portions, and the ninth preset weight portion includes 0.1 portions.

[0058] Specifically, the insulating performance regulating layer formed by the insulating performance regulating coating has good electrical resistance and aging resistance, and can effectively insulate the composite coating from the equipment surface to ensure the safe and stable operation of the power equipment. The base resin is used to fully mix the various raw materials, the filler plays an insulating role, the curing agent is used to make the insulating performance regulating coating curable, and the accelerator is used to accelerate the curing of the insulating performance regulating coating. Exemplarily, the base resin includes DER-331 bisphenol A epoxy resin; the filler includes a surface-treated barium titanate material, for example, it can be a barium titanate material that has been surface-treated with a silane coupling agent KH-550, and the material can be more evenly dispersed in the DER-331 bisphenol A epoxy resin as the base resin; the curing agent is methyltetrahydrophthalic anhydride or methylhexahydrophthalic anhydride; the accelerator includes N, N-dimethylbenzylamine.

[0059] The sixth preset weight portion of the base resin in the insulating performance regulating coating may be 10 parts, the seventh preset weight portion of the filler in the insulating performance regulating coating may be 40-60 parts, the eighth preset weight portion of the curing agent in the insulating performance regulating coating may be 8 parts, and the ninth preset weight portion of the accelerator in the insulating performance regulating coating may be 0.1 parts. By adjusting the proportion of the filler included in the insulating performance regulating coating, the insulating performance of the composite coating can be adjusted.

[0060] This embodiment provides an achievable implementation method 1, which is as follows: the composite coating includes an insulating performance regulating coating, a blue reversible color-changing coating, and a red reversible color-changing coating. Among them, the insulating performance regulating coating includes 10 parts of a base resin, 40 parts of a filler, 8 parts of a curing agent, and 0.1 parts of an accelerator. The filler is a barium titanate material surface-treated with a silane coupling agent KH-550, the base resin is a DER-331 bisphenol A epoxy resin, the curing agent is methyl tetrahydrophthalic anhydride or methyl hexahydrophthalic anhydride, and the accelerator is N, N-dimethylbenzylamine.

[0061] The blue reversible color-changing coating comprises 2 parts of blue reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber; the red reversible color-changing coating comprises 2 parts of red reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber. Among them, the blue reversible color-changing material comprises 1 part of crystal violet lactone as a color former, 1 part of bisphenol A as a color developer and 50 parts of octadecyl alcohol as a solvent; the red reversible color-changing material comprises 1 part of thermosensitive red as a color former, 2 parts of bisphenol A as a color developer and 50 parts of naphthalene as a solvent.

[0062] This embodiment provides an achievable implementation method 2, which differs from the achievable implementation method 1 in that: the blue reversible color-changing paint includes 3 parts of a blue reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber; the red reversible color-changing paint includes 3 parts of a red reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber. The remaining conditions are the same as those of the achievable implementation method 1.

[0063] This embodiment provides an achievable implementation method 3, which is different from the achievable implementation method 1 in that: the blue reversible color-changing paint includes 4 parts of blue reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber; the red reversible color-changing paint includes 2 parts of red reversible color-changing material and 10 parts of room temperature vulcanized silicone rubber. The remaining conditions are the same as those of the achievable implementation method 1.

[0064] This embodiment provides an achievable implementation mode 4, which is different from the achievable implementation mode 1 in that: the blue reversible color-changing material includes 1 part of crystal violet lactone as a color-forming agent, 2 parts of bisphenol A as a color-developing agent, and 50 parts of octadecyl alcohol as a solvent; the red reversible color-changing material includes 1 part of thermosensitive red as a color-forming agent, 1 part of bisphenol A as a color-developing agent, and 50 parts of naphthalene as a solvent. The remaining conditions are the same as those of the achievable implementation mode 1.

[0065] This embodiment provides an achievable implementation mode 5, which is different from the achievable implementation mode 1 in that: the blue reversible color-changing material includes 1 part of crystal violet lactone as a color-forming agent, 1 part of bisphenol A as a color-developing agent, and 60 parts of octadecyl alcohol as a solvent; the red reversible color-changing material includes 1 part of thermosensitive red as a color-forming agent, 2 parts of bisphenol A as a color-developing agent, and 60 parts of naphthalene as a solvent. The remaining conditions are the same as those of the achievable implementation mode 1.

[0066] According to the above-mentioned achievable embodiments 1 to 5, compared with achievable embodiment 1, achievable embodiment 2 increases the number of blue reversible color-changing materials and red reversible color-changing materials, which may make the color of the reversible color-changing layer darker, and the color change that occurs when a serious thermal defect or an emergency thermal defect is detected in the transformer bushing stud is not obvious enough, resulting in a decrease in the sensitivity and accuracy of monitoring thermal defects. Compared with achievable embodiment 1, achievable embodiment 3 increases the number of blue reversible color-changing materials, which makes the color change of the blue reversible color-changing layer not obvious enough, and the sensitivity and accuracy of monitoring the serious thermal defect of the transformer bushing stud are low. Compared with achievable embodiment 1, achievable embodiment 4 increases the number of color developers in the blue reversible color-changing materials and reduces the number of color developers in the red reversible color-changing materials, so that the blue reversible color-changing layer shows a darker blue, and the red reversible color-changing layer shows a lighter red, which reduces the sensitivity and accuracy of monitoring the serious thermal defect or the emergency thermal defect of the transformer bushing stud. Compared with the achievable embodiment 1, the achievable embodiment 5 increases the number of solvents in the reversible color-changing material, so that the proportion of the color former and the developer is reduced, resulting in the color change of the reversible color-changing layer not being obvious enough, and the sensitivity and accuracy of monitoring the thermal defects of the transformer bushing stud are low. In summary, the achievable embodiment 1 is the component of the composite coating with the best performance.

[0067] The embodiment of the present invention also provides a method for preparing the composite coating. Figure 1 FIG. 1 is a schematic diagram of a composite coating preparation method provided by an embodiment of the present invention. Figure 1 As shown, the composite coating preparation method specifically includes the following steps:

[0068] S110. Prepare an insulation performance regulating coating and a reversible color-changing coating; wherein the reversible color-changing coating includes a blue reversible color-changing coating and a red reversible color-changing coating.

[0069] Specifically, the corresponding raw materials are mixed and stirred to respectively prepare the insulating performance regulating coating, the blue reversible color-changing coating and the red reversible color-changing coating.

[0070] S120, coating the surface of the equipment with an insulating performance regulating coating, and curing the coating to form an insulating performance regulating layer.

[0071] Specifically, the insulating performance regulating coating is evenly coated on the entire surface of the transformer bushing column head, and an insulating performance regulating layer of a certain thickness is formed after high-temperature curing. Exemplarily, the coating thickness of the insulating performance regulating coating ranges from 0.1 to 0.5 mm; the high-temperature curing process is divided into two processes, pre-curing and post-curing, wherein the pre-curing temperature ranges from 75 to 85°C, the pre-curing time ranges from 3.5 to 4.5 hours, the post-curing temperature ranges from 135 to 145°C, and the post-curing time ranges from 11.5 to 12.5 hours.

[0072] S130, coating a blue reversible color-changing paint on a first preset area on the surface of the device to form a blue reversible color-changing layer.

[0073] Specifically, a blue reversible color-changing paint is evenly coated on a first preset area of ​​the transformer bushing column head, and a blue reversible color-changing layer of a certain thickness is formed after being allowed to stand and solidify.

[0074] S140, coating a red reversible color-changing paint on a second preset area on the surface of the device to form a red reversible color-changing layer.

[0075] Specifically, a red reversible color-changing paint is uniformly applied to the second preset area of ​​the transformer bushing column, and a red reversible color-changing layer of a certain thickness is formed after being left to solidify. The thickness of the blue reversible color-changing paint and the red reversible color-changing paint applied to the first preset area and the second preset area ranges from 0.1 to 0.5 mm, the standing temperature is room temperature, and the standing time ranges from 12 to 24 hours.

[0076] Among them, there is no overlap between the second preset area and the first preset area; the reversible color-changing coating includes room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material includes a colorant, a developer and a solvent; for the blue reversible color-changing coating, the solvent includes octadecyl alcohol; for the red reversible color-changing coating, the solvent includes naphthalene.

[0077] The composite coating preparation method provided by the embodiment of the present invention prepares an insulating performance regulating coating and a reversible color-changing coating, applies the insulating performance regulating coating on the surface of the equipment to form an insulating performance regulating layer, and applies a blue reversible color-changing coating and a red reversible color-changing coating respectively in the first preset area and the second preset area where there is no overlap, to form a blue reversible color-changing layer and a red reversible color-changing layer, so that the blue reversible color-changing layer and the red reversible color-changing layer will not interfere with each other when the color changes, thereby sensitively and intuitively reflecting the situation of thermal defects in the transformer bushing column head. The solvent used in the formed blue reversible color-changing layer is octadecyl alcohol, and its color change temperature range has a high degree of matching with the temperature of severe thermal defects in the transformer bushing column head; the solvent used in the formed red reversible color-changing layer is naphthalene, and its color change temperature range has a high degree of matching with the temperature of emergency thermal defects in the transformer bushing column head. Therefore, the composite coating prepared by the composite coating preparation method provided by the embodiment of the present invention can sensitively and intuitively reflect the thermal defects in the transformer bushing column head.

[0078] Optionally, Figure 2 yes Figure 1 Detailed flow chart of step S110 in FIG. Figure 2 As shown, the preparation of the insulating performance regulating coating and the reversible color changing coating in step S110 specifically includes the following steps:

[0079] S111, after the base resin, filler and curing agent are mixed and stirred, an accelerator is added and continued to be stirred to obtain an insulating performance regulating coating.

[0080] Specifically, the base resin, filler and curing agent are heated and mixed and stirred, the heating temperature range includes 75-85°C, the stirring rate range includes 300-500r / min, the stirring time range includes 20-40min before adding the accelerator, and the stirring time range includes 5-10min after adding the accelerator.

[0081] The base resin, filler and curing agent are placed in a reactor, and the reactor is heated at 75°C using an intelligent constant temperature electric heating jacket. After stirring at 500 r / min for 20 minutes using an electric stirrer under vacuum conditions, an accelerator is added and stirring is continued. After stirring for 10 minutes, an insulating performance regulating coating is obtained.

[0082] S112, mixing and stirring the blue reversible color-changing material and the room temperature vulcanized silicone rubber to obtain a blue reversible color-changing coating.

[0083] Specifically, the mixing time of the mixed reversible color-changing material and room temperature vulcanized silicone rubber is in the range of 5 to 10 minutes, and the mixing rate is in the range of 400 to 600 r / min. Exemplarily, the blue reversible color-changing material is mixed with the room temperature vulcanized silicone rubber, and the mixing rate is 400 r / min for 5 minutes, so that the blue reversible color-changing material and the room temperature vulcanized silicone rubber are evenly mixed to obtain a blue reversible color-changing coating.

[0084] S113, mixing and stirring the red reversible color-changing material and the room temperature vulcanized silicone rubber to obtain a red reversible color-changing coating.

[0085] Exemplarily, a red reversible color-changing material is mixed with room temperature vulcanized silicone rubber, and stirred at a stirring rate of 400 r / min for 5 minutes, so that the red reversible color-changing material and the room temperature vulcanized silicone rubber are evenly mixed to obtain a red reversible color-changing coating.

[0086] Optionally, based on the above embodiments, the method for preparing the reversible color-changing material including the blue reversible color-changing material in step S112 and the red reversible color-changing material in step S113 specifically includes the following steps:

[0087] Place the solvent in a beaker and heat and stir until the solvent is molten.

[0088] Exemplarily, the heating temperature range may be 150-180°C, the stirring rate range may be 500-700 r / min, and the stirring time range may be 20-40 min. For the blue reversible color-changing material, octadecanol as a solvent is placed in a beaker, heated at 150°C and stirred at 500 r / min in a heat-collecting magnetic stirring oil bath until the octadecanol is in a molten state; for the red reversible color-changing material, naphthalene as a solvent is placed in a beaker, heated at 160°C and stirred at 600 r / min in a heat-collecting magnetic stirring oil bath until the naphthalene is in a molten state.

[0089] Add a color former and a color developer to the solvent, continue stirring and mixing, then cool and grind to obtain a reversible color-changing material.

[0090] Exemplarily, the cooling temperature is room temperature, and the cooling time range can be 3 to 6 hours. Grinding can be carried out in a ball mill, and after grinding, screening and other steps are also included. The particle size range of the reversible color-changing material obtained after screening includes 30 to 100 μm. For the blue reversible color-changing material, crystal violet lactone as a color-forming agent and bisphenol A as a color developer are added to the molten octadecyl alcohol, and stirring and mixing is continued for 20 minutes, and then cooled and ground at room temperature to finally obtain the desired blue reversible color-changing material; for the red reversible color-changing material, thermosensitive red as a color-forming agent and bisphenol A as a color developer are added to the molten naphthalene, and stirring and mixing is continued for 20 minutes, and then cooled and ground at room temperature to finally obtain the desired red reversible color-changing material.

[0091] The embodiment of the present invention further provides a transformer bushing stud. The transformer bushing stud comprises a composite coating provided by any of the above embodiments coated on the surface. The transformer bushing stud has the same beneficial effects as the composite coating coated on the surface, which will not be described in detail here.

[0092] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite coating, characterized in that: include: An insulation performance regulating layer and a reversible color changing layer are formed by stacking and coating on the surface of the device; The insulation performance regulating layer is formed by using insulation performance coating, and the reversible color changing layer is formed by using reversible color changing coating; The reversible color-changing layer comprises a blue reversible color-changing layer and a red reversible color-changing layer, and there is no overlap between the blue reversible color-changing layer and the red reversible color-changing layer; The reversible color-changing coating comprises a blue reversible color-changing coating and a red reversible color-changing coating; the reversible color-changing coating comprises room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material comprises a color former, a color developer and a solvent; Wherein, for the blue reversible color-changing paint, the solvent includes octadecyl alcohol; for the red reversible color-changing paint, the solvent includes naphthalene.

2. The composite coating according to claim 1, characterized in that: For the blue reversible color-changing coating, the color former includes crystal violet lactone, and the developer includes bisphenol A; For the red reversible color-changing paint, the color former includes thermosensitive red, and the color developer includes bisphenol A.

3. The composite coating according to claim 1, characterized in that: The room temperature vulcanized silicone rubber has a first preset weight fraction, and the reversible color-changing material has a second preset weight fraction; The first preset weight portion ranges from 10 to 20 portions, and the second preset weight portion ranges from 1 to 4 portions.

4. The composite coating according to claim 2, characterized in that: In the reversible color-changing material, the color former has a third preset weight fraction, the developer has a fourth preset weight fraction, and the solvent has a fifth preset weight fraction; The third preset weight portion includes 1 portion, the fourth preset weight portion includes 1 to 6 portions, and the fifth preset weight portion includes 50 to 80 portions.

5. The composite coating according to claim 1, characterized in that: The insulation performance regulating layer is formed by using insulation performance regulating coating, and the insulation performance regulating coating comprises base resin, filler, curing agent and accelerator; The base resin has a sixth preset weight portion, the filler has a seventh preset weight portion, the curing agent has an eighth preset weight portion, and the accelerator has a ninth preset weight portion; The sixth preset weight portion includes 10 portions, the seventh preset weight portion includes a range of 40 to 60 portions, the eighth preset weight portion includes 8 portions, and the ninth preset weight portion includes 0.1 portions.

6. The composite coating according to claim 5, characterized in that: The filler includes a surface-treated barium titanate material; The base resin includes DER-331 bisphenol A epoxy resin; The curing agent is methyltetrahydrophthalic anhydride or methylhexahydrophthalic anhydride; The accelerator includes N,N-dimethylbenzylamine.

7. A method for preparing a composite coating, characterized in that: include: An insulation performance regulating coating and a reversible color-changing coating are prepared; wherein the reversible color-changing coating comprises a blue reversible color-changing coating and a red reversible color-changing coating; Coating the insulation performance regulating coating on the surface of the equipment and curing it to form an insulation performance regulating layer; Applying the blue reversible color-changing paint on a first preset area on the surface of the device to form a blue reversible color-changing layer; Applying the red reversible color-changing paint on a second preset area on the surface of the device to form a red reversible color-changing layer; Among them, the second preset area does not overlap with the first preset area; the reversible color-changing coating includes room temperature vulcanized silicone rubber and a reversible color-changing material; the reversible color-changing material includes a colorant, a developer and a solvent; for the blue reversible color-changing coating, the solvent includes octadecyl alcohol; for the red reversible color-changing coating, the solvent includes naphthalene.

8. The method for preparing a composite coating according to claim 7, characterized in that: The insulating performance regulating coating and the reversible color changing coating prepared by the method include: After mixing and stirring the base resin, filler and curing agent, adding an accelerator and continuing to stir, the insulating performance regulating coating is obtained; The blue reversible color-changing material and the room temperature vulcanized silicone rubber are mixed and stirred to obtain the blue reversible color-changing coating; The red reversible color-changing material and the room temperature vulcanized silicone rubber are mixed and stirred to obtain the red reversible color-changing coating.

9. The method for preparing a composite coating according to claim 8, characterized in that: The method for preparing the reversible color-changing material comprises: The solvent is placed in a beaker and heated and stirred until the solvent is in a molten state; The color former and the developer are added to the solvent, and the mixture is stirred and mixed, and then cooled and ground to obtain the reversible color-changing material.

10. A transformer bushing stud, characterized in that: The invention comprises the composite coating according to any one of claims 1 to 6 coated on a surface.

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