Tower electrified coating method based on self-curing insulating paint and tower

Abstract

The invention belongs to the technical field of electric power, and provides a pole tower electrified coating method based on self-curing insulating paint and a pole tower, a spraying method of the self-curing insulating paint with special performance is optimized and improved, during spraying, a spraying gun head is used for spraying from top to bottom, spraying is conducted in a phase sequence mode, and the self-curing insulating paint with the special performance is obtained. The cured insulating paint is sprayed out in a fan shape and is attached to the to-be-sprayed electric power equipment, a nozzle and a coating face are kept within a preset distance range, the coating face of a spraying gun head is in a preset included angle range, spraying is conducted once on the left side and the right side respectively, the spraying pressure is within a preset pressure range, and the staying time of each coating face is within a preset time range; after spraying is completed, air swings around the to-be-sprayed power equipment for blowing; the invention develops a quick and thick film spraying method capable of live working, the film can be formed by spraying at one time, the thickness of a wet film is 1.0 mm-1. 2mm, the thickness of a dry film can reach 0.8 mm-1. 0mm, and a cured coating obtained by spraying has the advantages of excellent adhesion with conductors made of various materials, firmness, no air gap, moisture resistance and corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a pole tower live coating method based on self-curing insulating paint and a pole tower. Background Art

[0002] Self-curing insulating coatings for distribution network pole equipment are high-performance new materials designed to meet the needs of insulating distribution network overhead lines and pole-mounted equipment. They have good insulation properties, are solvent-free, have high solid content, and have the advantages of heat resistance, cold resistance, weather aging resistance, acid rain erosion resistance, and long service life. When using self-curing insulating coatings for coating, it can be operated with or without power, and is suitable for spraying or brushing. In practical applications, live working is more easily adopted because it does not affect the normal operation of the distribution network. However, live working has higher requirements for operational safety, especially the need to adapt to the curing insulating coatings with special physical and chemical properties to achieve the effect of rapid film formation of the coating, which makes the technical requirements for the coating operation more specific and clear.

[0003] At present, in the self-curing insulating coating for power equipment and the method of use, a medium-pressure spray gun head is used for spraying. By controlling the spraying distance to control the film thickness, a film layer with uniform thickness and smooth surface can be obtained; however, this method requires rotating around the power equipment to be sprayed during spraying, which is relatively inconvenient in actual operation, especially when the operator needs to work at high altitude. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a pole tower live coating method based on self-curing insulating coating and a pole tower. During spraying, a spray gun head is used to spray first up and then down, and the spraying is carried out in phase sequence, so that the solidified insulating coating is sprayed out in a fan shape and adheres to the power equipment to be sprayed, the nozzle and the coating surface are kept within a preset distance range, the coating surface of the spray gun head is in a preset angle range, and the left and right are sprayed once, the spraying pressure is within the preset pressure range, and the residence time of each coating surface is within the preset time range. After spraying, air is used to swing and purge around the power equipment to be sprayed; a fast and thick coating spraying method that can be operated live is developed, and a film can be formed by spraying once, the wet film thickness is 1.0mm~1.2mm, and the dry film thickness can reach 0.8mm~1.0mm. The sprayed solidified coating has excellent adhesion to conductors of various materials, is firm and has no air gap, and is moisture-proof and corrosion-resistant; during spraying, there is no need to rotate around the power equipment to be sprayed, and the operator does not need to work at high altitude, thereby improving efficiency and safety.

[0005] In order to achieve the above-mentioned object, in the first aspect, the present invention provides a method for live tower coating based on self-curing insulating coating, which adopts the following technical scheme:

[0006] A method for live tower coating based on self-curing insulating coating, comprising:

[0007] Check the spraying environment and make sure that the spraying environment temperature is not lower than the preset temperature; make the surface of the power equipment to be sprayed dust-free and dry;

[0008] Use the spray gun head to spray first up and then down, in phase sequence, so that the solidified insulating coating is sprayed out in a fan shape and adheres to the power equipment to be sprayed. The nozzle and the coating surface are kept within a preset distance range. The coating surface of the spray gun head is within a preset angle range. Spray once on each side. The spraying pressure is within a preset pressure range. The residence time on each coating surface is within a preset time range. After spraying is completed, air is used to swing and purge around the power equipment to be sprayed.

[0009] Inspection and elimination of defects; insulation encapsulation layer.

[0010] Furthermore, the cured insulating coating is sprayed out in a fan shape and adheres to the electrical equipment to be sprayed, the nozzle is maintained at 20cm±5cm from the coating surface, the coating surface of the spray gun head is at an angle of 50°~70°, and spraying is performed once on each side. The spraying pressure is 0.6Mpa~0.8Mpa, and the residence time on each coating surface is 2s±0.5s.

[0011] Furthermore, the curing insulating coating is a solvent-free coating, with a curing time of 10 minutes to 20 minutes, a viscosity of 280 seconds to 380 seconds, a particle size of no more than 25 μm, and an adhesion of level 0 or 1.

[0012] Furthermore, when the dry film thickness of the cured insulating coating is 0.9 mm±0.1 mm, the breakdown voltage of the cured insulating coating subjected to continuous power frequency voltage withstand tests of 10 kV×1 min and 12 kV×1 min is greater than 15 kV.

[0013] Furthermore, when air is used to swing and purge around the electrical equipment to be sprayed, the air pressure is 0.2Mpa to 0.4Mpa, the purge residence time is 1s±0.5s, and the air is compressed air that has been filtered and dried.

[0014] Furthermore, the spraying is performed using an insulating rod.

[0015] Furthermore, when the surface of the electrical equipment to be sprayed is subjected to dust-free and dry treatment, a pneumatic brush is used for cleaning; when the surface of the electrical equipment to be sprayed is subjected to dust-free and dry treatment, a detergent or a cleaning method is used to remove oil stains on the electrical equipment to be sprayed.

[0016] Furthermore, after spraying, the film thickness is checked. If the wet film thickness does not reach 1.0 mm to 1.2 mm, spraying is repeated.

[0017] Furthermore, when forming the insulating encapsulating layer, the exposed conductive parts are sprayed again to form an encapsulating insulating protective layer.

[0018] In order to achieve the above-mentioned purpose, in a second aspect, the present invention further provides a pole tower, which adopts the following technical solution:

[0019] A pole tower is obtained by spraying the pole tower live coating method based on the self-curing insulating paint as described in the first aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention optimizes and improves the spraying method of self-curing insulating coatings with special performance. During spraying, a spray gun head is used to spray from top to bottom in phase sequence, so that the cured insulating coating is sprayed out in a fan shape and adheres to the power equipment to be sprayed. The nozzle and the coating surface are kept within a preset distance range, the coating surface of the spray gun head is within a preset angle range, and the left and right sides are sprayed once. The spraying pressure is within the preset pressure range, and the residence time of each coating surface is within the preset time range. After spraying, air is used to swing and purge around the power equipment to be sprayed; the film can be sprayed once, and the cured coating obtained by spraying has excellent adhesion to conductors of various materials, is firm and has no air gaps, and is moisture-proof and corrosion-resistant; there is no need to rotate around the power equipment to be sprayed during spraying, and there is no need for operators to work at high altitudes, thereby improving efficiency and safety.

[0022] 2. When spraying, the present invention uses a spray gun head to spray from top to bottom in phase sequence, so that the solidified insulating coating is sprayed out in a fan shape and adheres to the power equipment to be sprayed. The nozzle and the coating surface are kept at 20cm±5cm, the coating surface of the spray gun head is at an angle of 50°~70°, and the left and right sides are sprayed once. The spraying pressure is 0.6Mpa~0.8Mpa, and the residence time of each coating surface is 2s±0.5s. After spraying, air is used to swing and purge around the power equipment to be sprayed; a fast and thick film spraying method that can be operated with electricity has been developed, and a film can be sprayed once, with a wet film thickness of 1.0mm~1.2mm and a dry film thickness of 0.8mm~1.0mm. The solidified coating obtained by spraying has excellent adhesion to conductors of various materials, is firm and has no air gaps, and is moisture-proof and corrosion-resistant; when spraying, there is no need to rotate around the power equipment to be sprayed, and there is no need for operators to work at high altitudes, thereby improving efficiency and safety.

[0023] 3. The implementation process of the method in the present invention is simple and flexible, which improves the freedom of construction operation; by using the method in the present invention to perform insulating spraying, an insulating film layer of 0.8mm to 1.0mm is quickly formed on the exposed parts of the pole-mounted equipment of the distribution network line, and is encapsulated in each exposed conductive point to form a closed insulating sheath, which has multiple protective effects such as insulation, weather resistance, moisture resistance, and corrosion resistance.

[0024] 4. The hollow insulating rod of the insulating material used in this method can adapt to the needs of different working heights and voltage levels. The hollow core is used to transport compressed air, and different replaceable working tools (cleaning tools, spraying tools or pneumatic brushes, etc.) can be installed on the upper end of the operating rod. In order to ensure safety, the compressed air needs to be purified before entering the inner cavity of the operating rod, and the conductive impurities are removed by filtering and drying to ensure that the air has good dielectric properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0026] Figure 1 This is a flow chart of the method of Example 1 of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] Embodiment 1:

[0030] This embodiment provides a tower live coating method based on self-curing insulating paint, which optimizes and improves the coating method to increase the degree of freedom of construction operation; the self-curing insulating paint can be coated on the conductive parts of the 10kV tower through charged air spraying to form an insulating protective layer. The specific spraying steps are as follows:

[0031] S1. Safety inspection and spraying environment confirmation, avoid spraying in humid weather conditions such as fog, condensation, precipitation, snowfall, and windy and sandy weather conditions, and the spraying environment temperature must not be lower than -20℃. Optional:

[0032] S1.1. Safety inspection: Strictly follow the relevant standards and regulations of the power industry to ensure the safety of operators.

[0033] S1.2, spraying environment confirmation: spraying should be carried out on sunny days without heavy pollution, avoid fog, condensation, precipitation, snowfall and other humid weather conditions and windy and sandy weather conditions, the spraying environment temperature must not be lower than -20 ° C. The weather on the day of implementation of this embodiment was sunny, the relative air humidity was 48%, and the ambient temperature was 23 ° C.

[0034] S2. Clean and blow to make the surface of the electrical equipment to be sprayed clean, dust-free and dry.

[0035] Optional:

[0036] Use a cleaning agent to remove oil stains on the electrical equipment to be sprayed. Do not use surfactants or other cleaning agents with demoulding effects or strong oxidizing cleaning agents during the cleaning process. Then use a pneumatic brush to clean it, and then use compressed air to blow it to make the surface of the electrical equipment to be sprayed clean, dust-free and dry;

[0037] For oil leaking equipment, the oil leakage defect should be dealt with and the oil leak should be cleared before coating.

[0038] Optionally, when cleaning, a pneumatic brush is used for cleaning, and the blowing is done with compressed air; when cleaning, it also includes using a detergent or a cleaning method to remove oil stains on the electrical equipment to be sprayed, and surfactants or other cleaning agents with demoulding effects or strong oxidizing cleaning agents should not be used during the cleaning process.

[0039] S3, spraying, use a high-pressure spray gun head, spray first up and then down, spray in phase sequence, so that the solidified insulating paint is sprayed out in a fan shape and adheres to the power equipment to be sprayed, the nozzle and the coating surface are kept at 20cm±5cm, the coating surface of the spray gun head is at an angle of 50°~70°, spray once on each side, the spraying pressure is 0.6Mpa~0.8Mpa, and the residence time on each coating surface is 2s±0.5s. After spraying, use low-pressure air to swing and purge around the power equipment to be sprayed. Optional:

[0040] S3.1. Use hollow, connectable insulating rods made of insulating materials; use a high-pressure spray gun head to spray the solidified insulating coating in a fan shape and adhere to the electrical equipment to be sprayed. Keep the nozzle 20cm±5cm away from the coating surface, and the coating surface of the spray gun head at an angle of 60°. Spray once on each side, control the spray pressure to 0.7Mpa, and stay on each coating surface for 2s±0.5s.

[0041] S3.2. After spraying, use low-pressure air to swing and purge once around the power equipment to be sprayed. The pressure of the low-pressure air used is 0.3Mpa, and the purge residence time is 1s±0.5s. The air used is compressed air that has been filtered and dried. The order of spraying is to spray from top to bottom first, and spray in phase sequence. When there is a tendency of dripping, transfer to the next phase exposed parts. Spray the three phases one by one to coat once.

[0042] Optionally, the pressure of the low-pressure air is 0.2Mpa to 0.4Mpa, the purge residence time is 1s±0.5s, and the air used is compressed air that has been filtered and dried. Use a hollow, connectable and combined insulating rod made of insulating material for spraying.

[0043] S4. Inspection and elimination of defects:

[0044] Optionally, after spraying, the film thickness is checked to form a wet film with a thickness of about 1.0 mm to 1.2 mm. If the thickness does not meet the requirement, spraying can be repeated. During the implementation of this embodiment, the requirement is met in one spraying, and the wet film thickness is 1.1 mm, and no repeated spraying is performed.

[0045] Specifically, the self-curing insulating coating is a solvent-free coating, with a curing time of 10 min to 20 min, a viscosity of 280 s to 380 s, a particle size of no more than 25 μm, and an adhesion of level 0 or 1. More specifically, when the dry film thickness of the self-curing insulating coating is 0.9 mm ± 0.1 mm, the breakdown voltage of the self-curing insulating coating subjected to continuous power frequency voltage withstand tests of 10 kV × 1 min and 12 kV × 1 min is greater than 15 kV.

[0046] S5, insulation encapsulation layer, spray the exposed conductive parts again to form an encapsulation insulation protection layer. Optional:

[0047] The self-curing insulating coating used in this embodiment is a solvent-free coating with specific performance parameters as follows: curing time 15 minutes, viscosity 320 seconds, particle size not greater than 25 μm, and adhesion level 0; when the dry film thickness of the cured insulating coating is 0.9 mm ± 0.1 mm, the breakdown voltage of the continuous power frequency voltage withstand test of 10 kV × 1 min and 12 kV × 1 min is 16 kV.

[0048] This embodiment optimizes and improves the specific spraying pressure, spraying residence time and spraying method for the curing insulating coating with special performance, so that a 0.8mm to 1.0mm insulating film layer is quickly formed on the exposed parts of the pole-mounted equipment of the distribution network line, and is encapsulated on each exposed conductive point to form a closed insulating sheath, which has multiple protective functions such as insulation, weather resistance, moisture resistance, and corrosion resistance.

[0049] Embodiment 2:

[0050] This embodiment provides a method for live tower coating based on self-curing insulating paint, which is different from the method in Example 1 in that:

[0051] In step S1, during the safety inspection and spraying environment confirmation, the weather on the day of implementation was cloudy, the relative air humidity was 35%, and the ambient temperature was 16°C;

[0052] In step S2, there is no need to use a cleaning agent to remove the oil stains on the electrical equipment to be sprayed. Instead, a pneumatic brush is used to clean the equipment directly, and then compressed air is used to blow the equipment to make the surface of the electrical equipment to be sprayed clean, dust-free and dry.

[0053] In step S3, the coating surface of the spray gun head is at an angle of about 50°, the spraying pressure is 0.8 MPa, and the pressure of the low-pressure air is 0.4 MPa;

[0054] In step S4, the one-time spraying meets the requirement, the wet film thickness is 1.2 mm, and no repeated spraying is performed;

[0055] The specific performance parameters of the self-curing insulating coating are: curing time 20 minutes, viscosity 380 seconds, adhesion level 1; when the dry film thickness of the cured insulating coating is 0.9mm±0.1mm, the breakdown voltage of the continuous power frequency voltage withstand test of 10kV×1min and 12kV×1min is 18kV.

[0056] Embodiment 3:

[0057] This embodiment provides a method for live tower coating based on self-curing insulating paint, which is different from the method in Example 1 in that:

[0058] In step S1, the weather on the implementation day is sunny, the relative air humidity is 38%, and the ambient temperature is 1°C;

[0059] In step S2, there is no need to use a cleaning agent to remove the oil stains on the electrical equipment to be sprayed. Instead, a pneumatic brush is used to clean the equipment directly, and then compressed air is used to blow the equipment to make the surface of the electrical equipment to be sprayed clean, dust-free and dry.

[0060] In step S3, the coating surface of the spray gun head is at an angle of about 70°, the spraying pressure is 0.6 MPa, and the pressure of the low-pressure air is 0.2 MPa;

[0061] In step S4, the one-time spraying meets the requirement, the wet film thickness is 1.0 mm, and no repeated spraying is performed;

[0062] The specific performance parameters of the self-curing insulating coating are: curing time 10 minutes, viscosity 280 seconds, adhesion level 0; when the dry film thickness of the cured insulating coating is 0.9mm±0.1mm, the breakdown voltage of the continuous power frequency voltage withstand test of 10kV×1min and 12kV×1min is 17kV.

[0063] Embodiment 4:

[0064] This embodiment provides a method for live tower coating based on self-curing insulating paint, which is different from the method in Example 1 in that:

[0065] In step S1, the weather on the implementation day is sunny, the relative air humidity is 21%, and the ambient temperature is -9°C;

[0066] In step S3, the coating surface of the spray gun tip is at an angle of about 55°, the spraying pressure is 0.7 MPa, and the pressure of the low-pressure air is 0.4 MPa;

[0067] In step S4, the one-time spraying meets the requirement, the wet film thickness is 1.1 mm, and no repeated spraying is performed;

[0068] The specific performance parameters of the self-curing insulating coating are: curing time 12 minutes, viscosity 300 seconds, adhesion level 0; when the dry film thickness of the cured insulating coating is 0.9mm±0.1mm, the breakdown voltage of the continuous power frequency voltage withstand test of 10kV×1min and 12kV×1min is 18kV.

[0069] Comparative Example 1:

[0070] This comparative example provides a method for live tower coating based on self-curing insulating coating, which is different from the method in Example 1 in that:

[0071] In step S1, the weather on the implementation day is sunny, the relative air humidity is 45%, and the ambient temperature is 25°C;

[0072] In step S3, the coating surface of the spray gun head is at an angle of about 90°, and the spraying pressure is 0.4Mpa;

[0073] In step S4, the one-time spraying meets the requirement, the wet film thickness is 0.6 mm, and a repeated spraying is performed.

[0074] Comparative Example 2:

[0075] This comparative example provides a method for live tower coating based on self-curing insulating coating, which is different from the method in Example 1 in that:

[0076] In step S1, the weather on the implementation day is sunny, the relative air humidity is 47%, and the ambient temperature is 22°C;

[0077] In step S3, the coating surface of the spray gun tip is at an angle of about 30°, and the spraying pressure is 0.6 MPa;

[0078] In step S4, the requirement is met after one spraying, and the wet film thickness is 0.4 mm, and the spraying is repeated twice.

[0079] Comparative Example 3:

[0080] This comparative example provides a method for live tower coating based on self-curing insulating coating, which is different from the method in Example 1 in that:

[0081] In step S1, the weather on the implementation day is sunny, the relative air humidity is 42%, and the ambient temperature is 26°C;

[0082] In step S3, low-pressure air swing purge is not performed once;

[0083] In step S4, the one-time spraying meets the requirement, the wet film thickness is 1.2 mm, and no repeated spraying is performed.

[0084] Coating effect monitoring and analysis:

[0085] The coating sites of the embodiments and comparative examples were observed for 8 months, and the appearance of the coating sites was recorded every month to count whether cracking, aging, shedding, etc. occurred. Within 8 months, no cracking, aging, shedding, etc. occurred in embodiments 1 to 4 and comparative example 3, while cracking and shedding began in comparative example 1 and comparative example 2 in the 6th month, and cracking occurred in comparative example 3 in the 7th month.

[0086] Insulation resistance comparison test:

[0087] Since this test needs to be carried out with power off, the simulated equipment is tested under the same environment as the embodiment and the comparative example. The insulation resistance of the simulated coating site is measured using a 2500V megger every month and recorded. The statistical period is 8 months. The results are shown in Table 1.

[0088] Table 1: Summary of insulation resistance comparison test results

[0089]

[0090]

[0091] It can be seen from the results in Table 1 that the insulation resistance of the embodiment of the present invention remained stable within 8 months of the simulation test and had no tendency of accelerated degradation.

[0092] Surface hydrophobicity comparison test:

[0093] Since this test needs to be carried out with power off, the simulated equipment is tested under the same environment as the embodiment and the comparative example. The hydrophobicity tester is used to test the coating site for hydrophobicity every month, and the hydrophobicity HC level is recorded. The statistical period is 8 months. The results are shown in Table 2.

[0094] Table 2: Summary of surface hydrophobicity comparison test results

[0095]

[0096]

[0097] It can be seen from the results in Table 2 that the embodiments of the present invention still exhibit good water repellency within 8 months of the simulation test.

[0098] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A method for live tower coating based on self-curing insulating coating, characterized in that: include: Check the spraying environment and make sure that the spraying environment temperature is not lower than the preset temperature; make the surface of the power equipment to be sprayed dust-free and dry; Use the spray gun head to spray first up and then down, in phase sequence, so that the solidified insulating coating is sprayed out in a fan shape and adheres to the power equipment to be sprayed. The nozzle and the coating surface are kept within a preset distance range. The coating surface of the spray gun head is within a preset angle range. Spray once on each side. The spraying pressure is within a preset pressure range. The residence time on each coating surface is within a preset time range. After spraying is completed, air is used to swing and purge around the power equipment to be sprayed. Inspection and defect elimination; insulation encapsulation layer.

2. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: The solidified insulating coating is sprayed out in a fan shape and adheres to the electrical equipment to be sprayed. The nozzle is kept 20cm±5cm away from the coating surface. The coating surface of the spray gun head is at an angle of 50°~70°. Spray once on each side. The spraying pressure is 0.6Mpa~0.8Mpa, and the residence time on each coating surface is 2s±0.5s.

3. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: The curing insulating coating is a solvent-free coating, with a curing time of 10 to 20 minutes, a viscosity of 280 to 380 seconds, a particle size of no more than 25 μm, and an adhesion of level 0 or 1.

4. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: When the dry film thickness of the cured insulating coating is 0.9 mm±0.1 mm, the breakdown voltage of the cured insulating coating subjected to continuous power frequency voltage withstand tests of 10 kV×1 min and 12 kV×1 min is greater than 15 kV.

5. A method for live tower coating based on self-curing insulating paint according to claim 1, characterized in that: When air is used to swing and purge around the electrical equipment to be sprayed, the air pressure is 0.2Mpa~0.4Mpa, the purge residence time is 1s±0.5s, and the air is compressed air that has been filtered and dried.

6. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: Spraying is done using an insulating rod.

7. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: When the surface of the electrical equipment to be sprayed is dust-free and dry, use a pneumatic brush to clean it; when the surface of the electrical equipment to be sprayed is dust-free and dry, use a detergent or cleaning method to remove oil stains on the electrical equipment to be sprayed.

8. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: After spraying, check the film thickness. If the wet film thickness does not reach 1.0mm~1.2mm, repeat the spraying.

9. A method for live tower coating based on self-curing insulating coating according to claim 1, characterized in that: When forming the insulating encapsulating layer, the exposed conductive parts are sprayed again to form an encapsulating insulating protective layer.

10. A pole tower, characterized in that: The method is obtained by spraying the tower live coating method based on the self-curing insulating coating as described in any one of claims 1 to 9.

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