Method for evaluating service life of RTV anti-pollution flashover coating

Abstract

The invention provides a method for evaluating the service life of an RTV anti-pollution flashover coating. The method comprises the following steps: respectively obtaining the base rubber contents of vulcanized silicone rubber materials formed by curing a to-be-detected RTV anti-pollution flashover coating and a standard RTV anti-pollution flashover coating at room temperature as the initial base rubber contents of the to-be-detected RTV anti-pollution flashover coating and the standard RTV anti-pollution flashover coating; respectively obtaining the base rubber contents when vulcanized silicone rubber materials formed by curing the RTV anti-pollution flashover coating to be detected and the standard RTV anti-pollution flashover coating at room temperature are aged to a life threshold value in an accelerated aging experiment, and taking the base rubber contents as the final base rubber contents of the RTV anti-pollution flashover coating to be detected and the standard RTV anti-pollution flashover coating; further determining the effective base rubber content of the RTV anti-pollution flashover coating to be detected and the standard RTV anti-pollution flashover coating, and determining the actual service life of the RTV anti-pollution flashover coating to be detected in the target environment by combining the actual service life of the standard RTV anti-pollution flashover coating in the target environment.

Description

Technical Field

[0001] The invention relates to a life evaluation method for an RTV anti-pollution flashover coating (i.e. room temperature vulcanized silicone rubber coating). Background Art

[0002] Inorganic materials such as ceramics and glass have long been used in the field of outdoor insulation. Their inert and stable characteristics allow them to withstand a large number of arcs without causing serious surface degradation problems. However, inorganic materials such as glass and ceramic insulators have high surface energy, and their high wettability makes them very easy to generate leakage current when polluted and wet, resulting in accidents such as pollution flashover and power system power outages. Pollution flashover refers to the breakdown discharge phenomenon that occurs along the surface of the insulator under normal operating voltage of the external insulation element under polluted and humid conditions. Pollution and rainfall are difficult to avoid in the natural environment, and the use of room temperature vulcanized silicone rubber (Room Temperature Vulcanized, RTV) coating can better cope with these environmental conditions. This is because porcelain suspension insulators coated with RTV anti-pollution flashover coating can obtain hydrophobicity.

[0003] The main function of RTV anti-pollution flashover coating is to provide long-lasting hydrophobic migration for ceramic / glass insulators, so that the insulators can obtain long-lasting excellent anti-pollution flashover performance. However, the current service life of RTV anti-pollution flashover coating is only 10 to 15 years, which is still relatively short compared to the long service life of 50 to 100 years for glass and porcelain insulators. This mismatch in operating life makes RTV anti-pollution flashover coating the shortcoming of coated ceramic / glass insulators. At the end of the coating life, it is necessary to spend money and manpower to re-coat the RTV anti-pollution flashover coating. Therefore, reasonable improvement of the formula and reasonable estimation of the service life of RTV anti-pollution flashover coating are of great significance for the application of RTV anti-pollution flashover coating on coated insulators.

[0004] In the operational life assessment of RTV anti-pollution flashover coatings, insulators in a specific natural environment are currently used for parameter measurement, the influence of the natural environment on the aging characteristic parameters is fitted, and a life prediction model is established. The life is predicted using aging parameters such as fracture strain. The objects selected include insulators and coatings in actual use or samples that have been aged in the laboratory. For the research on life prediction, the life prediction and aging state assessment are mainly based on the relevant parameters of the surface performance in the measurement, as well as the research on the correlation between the parameters and the life. These life assessment methods for RTV anti-pollution flashover coatings generally have problems such as cumbersome processes and inability to effectively guarantee accuracy.

[0005] In summary, there is still a need to study new RTV anti-pollution flashover coating life assessment schemes that can quickly and accurately determine the life of RTV anti-pollution flashover coatings. Summary of the invention

[0006] The object of the present invention is to provide an RTV anti-pollution flashover coating life assessment scheme capable of quickly and accurately determining the life of the RTV anti-pollution flashover coating.

[0007] In order to solve the above problems, the present invention provides a method for evaluating the life of an RTV anti-pollution flashover coating, wherein the method comprises:

[0008] Respectively obtain the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature, as the initial base rubber content of the RTV anti-pollution flashover coating to be tested and the initial base rubber content of the standard RTV anti-pollution flashover coating;

[0009] The base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature is obtained respectively when the material is aged to the life threshold in an accelerated aging test, and the base rubber content is used as the final base rubber content of the RTV anti-pollution flashover coating to be tested and the final base rubber content of the standard RTV anti-pollution flashover coating;

[0010] Based on the initial base rubber content and the final base rubber content of the RTV anti-pollution flashover coating to be tested, the effective base rubber content of the RTV anti-pollution flashover coating to be tested is determined; based on the initial base rubber content and the final base rubber content of the standard RTV anti-pollution flashover coating, the effective base rubber content of the standard RTV anti-pollution flashover coating is determined;

[0011] The actual service life of the RTV anti-pollution flashover coating to be tested in the target environment is determined by using the effective base rubber content of the RTV anti-pollution flashover coating to be tested and the effective base rubber content of the standard RTV anti-pollution flashover coating, combined with the actual service life of the standard RTV anti-pollution flashover coating in the target environment.

[0012] According to a preferred implementation of the RTV anti-pollution flashover coating life assessment method, the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating contain the same types of components, and the only difference between them is the base glue content.

[0013] According to a preferred embodiment of the RTV anti-pollution flashover coating life evaluation method, the effective base rubber content is determined by the following formula:

[0014] φ 有效 =φ 初始 -φ 最终

[0015] In the formula, φ 有效 is the effective base rubber content, wt% (mass percentage); φ 初始 is the initial base rubber content, wt% (mass percentage); φ 最终 is the final gum content, wt % (mass percentage).

[0016] According to a preferred embodiment of the RTV anti-pollution flashover coating life assessment method, the life of the RTV anti-pollution flashover coating to be tested in actual use is determined by the following formula:

[0017] L 待测 =(φ 有效待测 ÷φ 有效目标 )×L 目标

[0018] In the formula, φ 有效待测 is the effective base rubber content of the RTV anti-fouling flashover coating to be tested, wt%; φ 有效目标 is the effective base content of standard RTV anti-fouling flashover coating, wt%; L 目标 is the actual service life of standard RTV anti-pollution flashover coating in the target environment; L 待测 It is the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment.

[0019] According to a preferred embodiment of the RTV anti-pollution flashover coating life assessment method, respectively obtaining the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature comprises:

[0020] The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the RTV anti-pollution flashover coating to be tested;

[0021] The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the standard RTV anti-pollution flashover coating;

[0022] Performing a base rubber content test on the initial sample of the RTV anti-pollution flashover coating to be tested, and determining the base rubber content of the initial sample of the RTV anti-pollution flashover coating to be tested as the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested at room temperature;

[0023] The base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is tested, and the base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the standard RTV anti-pollution flashover coating at room temperature.

[0024] According to a preferred embodiment of the RTV anti-pollution flashover coating life assessment method, the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature when subjected to an accelerated aging test and aged to a life threshold value comprises:

[0025] The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the RTV anti-pollution flashover coating to be tested;

[0026] The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the standard RTV anti-pollution flashover coating;

[0027] Perform an accelerated aging experiment on the sample group of the RTV anti-pollution flashover coating to be tested and the sample group of the standard RTV anti-pollution flashover coating, take at least one sample from the sample group of the RTV anti-pollution flashover coating to be tested and take at least one sample from the sample group of the standard RTV anti-pollution flashover coating to test the base rubber content at each aging time interval, until the base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold and the base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating when aged to the life threshold are determined, and the accelerated aging experiment is terminated;

[0028] The base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested when aged to the life threshold in an accelerated aging experiment; The base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the standard RTV anti-pollution flashover coating when aged to the life threshold in an accelerated aging experiment;

[0029] More preferably, judging whether the sample has aged to the life threshold is carried out in a conventional manner, which is not limited here. For example, it can be judged by the performance or morphology of the sample. When the hydrophobicity or adhesion of the sample surface is lost, it is judged that the sample has aged to the life threshold.

[0030] According to a preferred implementation of the RTV anti-pollution flashover coating life assessment method, the RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material, including: the RTV anti-pollution flashover coating to be tested is cured in a constant temperature box at 25-30°C for 2-3 days to form a vulcanized silicone rubber material.

[0031] According to a preferred embodiment of the RTV anti-pollution flashover coating life assessment method, wherein the target RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material, comprising: the target RTV anti-pollution flashover coating is cured in a constant temperature box at 25-30°C for 2-3 days to form a vulcanized silicone rubber material.

[0032] According to a preferred embodiment of the RTV anti-pollution flashover coating life evaluation method, wherein the base glue content test adopts TGA test;

[0033] More preferably, the TGA test is performed as follows:

[0034] After cleaning the surface of the sample, place it in a TGA experimental instrument, pass nitrogen into the TGA experimental instrument to replace the gas in the TGA experimental instrument, set the test parameters, and perform TGA test on the sample in a nitrogen atmosphere;

[0035] During the TGA test, the nitrogen gas flow rate is not less than 40 ml / min (preferably 40-70 ml / min), the minimum temperature is 25-50°C (preferably 40°C), the maximum temperature is 800-1000°C (preferably 800°C), and the heating rate is 10-20°C / min (preferably 10°C / min);

[0036] More preferably, the surface of the sample is cleaned using alcohol;

[0037] More preferably, the mass of the sample is 8±3 mg.

[0038] The technical solution provided by the present invention is based on the positive relationship between the effective base glue content of the RTV anti-pollution flashover coating and the life of the RTV anti-pollution flashover coating, and can simply and quickly realize the life evaluation of the RTV anti-pollution flashover coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the process for evaluating the life of RTV anti-fouling flashover coatings.

[0040] Figure 2 Schematic diagram of the changing characteristics of the base gum content during the aging process in Example 1.

[0041] Figure 3 This is the TGA curve corresponding to the samples in the sample group of the RTV anti-fouling flashover coating to be tested in Example 1 when they are aged to the life threshold. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0043] The existing RTV anti-pollution flashover coating life assessment method mainly focuses on the study of the influence of the natural environment on aging characteristic parameters such as fracture strain and the correlation between aging characteristic parameters such as fracture strain and life, and then uses the research results of the influence of the natural environment on aging characteristic parameters such as fracture strain and the correlation between aging characteristic parameters such as fracture strain and life to establish a life prediction model, and then use the life prediction model to predict the life. This type of RTV anti-pollution flashover coating life assessment method has many problems: on the one hand, the life prediction model is difficult to construct and once the natural environment changes, the life prediction model needs to be reconstructed; on the other hand, the accuracy depends entirely on the reliability of the life prediction model. Based on this, the inventor is committed to studying a technical solution that can more simply and quickly evaluate the life of RTV anti-pollution flashover coatings. After research, the inventor found that there is a positive correlation between the effective base glue content of RTV anti-pollution flashover coatings and the life of RTV anti-pollution flashover coatings. Based on this, a new RTV anti-pollution flashover coating life assessment method is proposed.

[0044] A specific embodiment of the present invention provides a method for evaluating the life of an RTV anti-pollution flashover coating, the process of which is as follows: Figure 1 As shown, the method includes:

[0045] Step S101: respectively obtaining the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature, as the initial base rubber content of the RTV anti-pollution flashover coating to be tested and the initial base rubber content of the standard RTV anti-pollution flashover coating;

[0046] Step S102: respectively obtaining the base rubber content of the vulcanized silicone rubber materials formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature when the materials are aged to the life threshold in an accelerated aging test, as the final base rubber content of the RTV anti-pollution flashover coating to be tested and the final base rubber content of the standard RTV anti-pollution flashover coating;

[0047] Step S103: determining the effective base rubber content of the RTV anti-pollution flashover coating to be tested based on the initial base rubber content and the final base rubber content of the RTV anti-pollution flashover coating to be tested; determining the effective base rubber content of the standard RTV anti-pollution flashover coating based on the initial base rubber content and the final base rubber content of the standard RTV anti-pollution flashover coating;

[0048] Step S104: Determine the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment by using the effective base rubber content of the RTV anti-pollution flashover coating to be tested and the effective base rubber content of the standard RTV anti-pollution flashover coating, combined with the actual service life of the standard RTV anti-pollution flashover coating in the target environment.

[0049] Furthermore, the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating contain the same types of components, and the only difference between them is the base glue content.

[0050] Furthermore, the effective base gum content is determined by the following formula:

[0051] φ 有效 =φ 初始 -φ 最终

[0052] In the formula, φ 有效 is the effective base rubber content, wt% (mass percentage); φ 初始 is the initial base rubber content, wt% (mass percentage); φ 最终 is the final gum content, wt % (mass percentage).

[0053] Furthermore, the life of the RTV anti-fouling flashover coating to be tested in actual use is determined by the following formula:

[0054] L 待测 =(φ 有效待测 ÷φ 有效目标 )×L 目标

[0055] In the formula, φ 有效待测 is the effective base rubber content of the RTV anti-fouling flashover coating to be tested, wt%; φ 有效目标 is the effective base content of standard RTV anti-fouling flashover coating, wt%; L 目标 is the actual service life of standard RTV anti-pollution flashover coating in the target environment; L 待测 It is the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment.

[0056] Further, the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature is obtained respectively, including:

[0057] The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the RTV anti-pollution flashover coating to be tested;

[0058] The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the standard RTV anti-pollution flashover coating;

[0059] Performing a base rubber content test on the initial sample of the RTV anti-pollution flashover coating to be tested, and determining the base rubber content of the initial sample of the RTV anti-pollution flashover coating to be tested as the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested at room temperature;

[0060] The base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is tested, and the base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the standard RTV anti-pollution flashover coating at room temperature.

[0061] Furthermore, the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature is obtained for accelerated aging test when the aging reaches the life threshold, including:

[0062] The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the RTV anti-pollution flashover coating to be tested;

[0063] The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the standard RTV anti-pollution flashover coating;

[0064] Perform an accelerated aging experiment on the sample group of the RTV anti-pollution flashover coating to be tested and the sample group of the standard RTV anti-pollution flashover coating, take at least one sample from the sample group of the RTV anti-pollution flashover coating to be tested and take at least one sample from the sample group of the standard RTV anti-pollution flashover coating to test the base rubber content at each aging time interval, until the base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold and the base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating when aged to the life threshold are determined, and the accelerated aging experiment is terminated;

[0065] The base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested when aged to the life threshold in an accelerated aging experiment; The base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the standard RTV anti-pollution flashover coating when aged to the life threshold in an accelerated aging experiment;

[0066] Furthermore, judging whether the sample has aged to the life threshold can be carried out in a conventional manner, which is not limited here. For example, it can be judged by the performance or morphology of the sample. When the hydrophobicity or adhesion of the sample surface is lost, it is judged that the sample has aged to the life threshold.

[0067] Furthermore, the RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material, including: the RTV anti-pollution flashover coating to be tested is cured in a constant temperature box at 25-30° C. (preferably 30° C.) for 2-3 days (preferably 3 days) to form a vulcanized silicone rubber material.

[0068] Further, the target RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material, including: the target RTV anti-pollution flashover coating is cured in a constant temperature box at 30° C. for 3 days to form a vulcanized silicone rubber material.

[0069] Furthermore, the base rubber content was tested using TGA test;

[0070] Furthermore, the TGA test is performed as follows:

[0071] After cleaning the surface of the sample, place it in a TGA experimental instrument, pass nitrogen into the TGA experimental instrument to replace the gas in the TGA experimental instrument, set the test parameters, and perform TGA test on the sample in a nitrogen atmosphere;

[0072] During the TGA test, the nitrogen gas flow rate is not less than 40 ml / min (preferably 40-70 ml / min), the minimum temperature is 25-50°C (preferably 40°C), the maximum temperature is 800-1000°C (preferably 800°C), and the heating rate is 10-20°C / min (preferably 10°C / min);

[0073] Furthermore, the surface cleaning of the samples was performed using alcohol;

[0074] Furthermore, the mass of the sample was 8±3 mg.

[0075] Example 1

[0076] This embodiment provides a method for evaluating the life of RTV anti-pollution flashover coating, and its process is as follows: Figure 1 As shown, the method includes:

[0077] 1. The RTV anti-pollution flashover coating to be tested was cured in a 30°C thermostat for 3 days to form a vulcanized silicone rubber material and a 8.887 mg sample was cut as the initial sample of the RTV anti-pollution flashover coating to be tested; the standard RTV anti-pollution flashover coating was cured in a 30°C thermostat for 3 days to form a vulcanized silicone rubber material and a 9.662 mg sample was cut as the initial sample of the standard RTV anti-pollution flashover coating; the initial sample of the RTV anti-pollution flashover coating to be tested was subjected to a TGA test to determine the base rubber content of the initial sample of the RTV anti-pollution flashover coating to be tested as the initial base rubber content of the RTV anti-pollution flashover coating to be tested; the initial sample of the standard RTV anti-pollution flashover coating was subjected to a TGA test to determine the base rubber content of the initial sample of the standard RTV anti-pollution flashover coating as the initial base rubber content of the standard RTV anti-pollution flashover coating;

[0078] Among them, the TGA test is carried out in the following way:

[0079] After cleaning the surface of the sample with alcohol, place it in the TGA experimental instrument, pass nitrogen into the TGA experimental instrument to replace the gas in the TGA experimental instrument, set the test parameters and perform TGA test on the sample in a nitrogen atmosphere; during the TGA test, the nitrogen gas flow rate is 60ml / min, the minimum temperature is 40℃, the maximum temperature is 800℃, and the heating rate is 10℃ / min;

[0080] The RTV anti-pollution flashover paint to be tested and the standard RTV anti-pollution flashover paint contain the same types of components (both contain base glue, flame retardant and white carbon black as main components), and the only difference between them is the different content of base glue.

[0081] Finally, the initial base rubber content of the RTV anti-pollution flashover coating to be tested was 71.131wt%, and the initial base rubber content of the standard RTV anti-pollution flashover coating was 45.492wt%.

[0082] 2. The RTV anti-pollution flashover coating to be tested was cured in a 30°C constant temperature box for 3 days to form a vulcanized silicone rubber material, and a group of samples of about 8 mg were cut as the sample group of the RTV anti-pollution flashover coating to be tested; the standard RTV anti-pollution flashover coating was cured in a 30°C constant temperature box for 3 days to form a vulcanized silicone rubber material, and a group of samples were cut as the sample group of the standard RTV anti-pollution flashover coating;

[0083] The sample group of the RTV anti-pollution flashover coating to be tested and the sample group of the standard RTV anti-pollution flashover coating are placed in a high-temperature oven, and accelerated aging experiments are carried out at 150°C and 250°C respectively. After each aging period, a sample is taken from the sample group of the RTV anti-pollution flashover coating to be tested and a sample is taken from the sample group of the standard RTV anti-pollution flashover coating to be tested for TGA test to determine the base rubber content thereof, until the base rubber content of the sample in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold and the base rubber content of the sample in the sample group of the standard RTV anti-pollution flashover coating when aged to the life threshold are determined, and the accelerated aging experiment is terminated;

[0084] The base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when the samples are aged to the life threshold is determined as the final base rubber content of the RTV anti-pollution flashover coating to be tested; the base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating to be tested when the samples are aged to the life threshold is determined as the final base rubber content of the standard RTV anti-pollution flashover coating;

[0085] Wherein, whether the sample has aged to the life threshold is determined by judging the performance of the sample, and when the hydrophobic performance of the sample surface is lost, it is determined that the sample has aged to the life threshold;

[0086] Among them, the TGA test is carried out in the following way:

[0087] After cleaning the surface of the sample with alcohol, place it in a TGA experimental instrument, pass nitrogen into the TGA experimental instrument to replace the gas in the TGA experimental instrument, set the test parameters to perform TGA test on the sample in a nitrogen atmosphere; during the TGA test, the nitrogen gas flow rate is 60 ml / min, the minimum temperature is 40°C, the maximum temperature is 800°C, and the heating rate is 10°C / min.

[0088] The content of base rubber also shows a changing trend as the aging process gradually occurs, such as Figure 2 As shown. Figure 3 The figure shows the TGA curve corresponding to the aging of the sample in the RTV anti-pollution flashover coating to be tested to the life threshold. It can be calculated that the corresponding base rubber content value at this time is 19.537wt%. The final base rubber content of the RTV anti-pollution flashover coating to be tested and the final base rubber content of the standard RTV anti-pollution flashover coating are both 19.537wt%.

[0089] 3. Based on the initial base rubber content and final base rubber content of the RTV anti-pollution flashover coating to be tested, determine the effective base rubber content of the RTV anti-pollution flashover coating to be tested; based on the initial base rubber content and final base rubber content of the standard RTV anti-pollution flashover coating, determine the effective base rubber content of the standard RTV anti-pollution flashover coating;

[0090] Among them, the effective base rubber content is determined by the following formula:

[0091] φ 有效 =φ 初始 -φ 最终

[0092] In the formula, φ 有效 is the effective base rubber content, wt% (mass percentage); φ 初始 is the initial base rubber content, wt% (mass percentage); φ 最终 is the final gum content, wt % (mass percentage).

[0093] The effective base rubber content of the RTV anti-pollution flashover coating to be tested is 51.594wt%, and the effective base rubber content of the standard RTV anti-pollution flashover coating is 25.955wt%.

[0094] 4. Determine the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment by using the effective base rubber content of the RTV anti-pollution flashover coating to be tested and the effective base rubber content of the standard RTV anti-pollution flashover coating, combined with the actual service life of the standard RTV anti-pollution flashover coating in the target environment;

[0095] The actual service life of the RTV anti-fouling flashover coating to be tested is determined by the following formula:

[0096] L 待测 =(φ有效待测 ÷φ 有效目标 )×L 目标

[0097] In the formula, φ 有效待测 is the effective base rubber content of the RTV anti-fouling flashover coating to be tested, wt%; φ 有效目标 is the effective base content of standard RTV anti-fouling flashover coating, wt%; L 目标 is the actual service life of standard RTV anti-pollution flashover coating in the target environment; L 待测 It is the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment.

[0098] The actual service life of the standard RTV anti-pollution flashover coating in the target environment is 10-15 years, and the ratio of the effective base rubber content of the RTV anti-pollution flashover coating to be tested to the effective base rubber content of the standard RTV anti-pollution flashover coating is 51.594% ÷ 25.955% ≈ 2. It can be determined that the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment is 20-30 years.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for evaluating the life of RTV anti-pollution flashover coatings, wherein: The method includes: Respectively obtain the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature, as the initial base rubber content of the RTV anti-pollution flashover coating to be tested and the initial base rubber content of the standard RTV anti-pollution flashover coating; The base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature is obtained respectively when the material is aged to the life threshold in an accelerated aging test, and the base rubber content is used as the final base rubber content of the RTV anti-pollution flashover coating to be tested and the final base rubber content of the standard RTV anti-pollution flashover coating; Based on the initial base rubber content and the final base rubber content of the RTV anti-pollution flashover coating to be tested, the effective base rubber content of the RTV anti-pollution flashover coating to be tested is determined; based on the initial base rubber content and the final base rubber content of the standard RTV anti-pollution flashover coating, the effective base rubber content of the standard RTV anti-pollution flashover coating is determined; The actual service life of the RTV anti-pollution flashover coating to be tested in the target environment is determined by using the effective base rubber content of the RTV anti-pollution flashover coating to be tested and the effective base rubber content of the standard RTV anti-pollution flashover coating, combined with the actual service life of the standard RTV anti-pollution flashover coating in the target environment.

2. The lifespan assessment method according to claim 1, wherein: The RTV anti-pollution flashover paint to be tested and the standard RTV anti-pollution flashover paint contain the same types of components, and the only difference between them is the base glue content.

3. The lifespan assessment method according to claim 1, wherein: The effective base rubber content is determined by the following formula: f 有效 =φ 初始 -f 最终 In the formula, φ 有效 is the effective base rubber content, wt%; φ 初始 is the initial base rubber content, wt%; φ 最终 is the final gum base content, wt%.

4. The lifespan assessment method according to claim 1, wherein: The life of the RTV anti-fouling flashover coating to be tested in actual use is determined by the following formula: L 待测 =(φ 有效待测 ÷f 有效目标 )×L 目标 In the formula, φ 有效待测 is the effective base rubber content of the RTV anti-fouling flashover coating to be tested, wt%; φ 有效目标 is the effective base content of standard RTV anti-fouling flashover coating, wt%; L 目标 is the actual service life of standard RTV anti-pollution flashover coating in the target environment; L 待测 It is the actual service life of the RTV anti-pollution flashover coating to be tested in the target environment.

5. The lifespan assessment method according to claim 1, wherein: The base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature includes: The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the RTV anti-pollution flashover coating to be tested; The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and at least one sample is taken as an initial sample of the standard RTV anti-pollution flashover coating; Performing a base rubber content test on the initial sample of the RTV anti-pollution flashover coating to be tested, and determining the base rubber content of the initial sample of the RTV anti-pollution flashover coating to be tested as the base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested at room temperature; The base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is tested, and the base rubber content of the initial sample of the standard RTV anti-pollution flashover coating is determined as the base rubber content of the vulcanized silicone rubber material formed by curing the standard RTV anti-pollution flashover coating at room temperature.

6. The lifespan assessment method according to claim 1, wherein: The base rubber content of the vulcanized silicone rubber material formed by curing the RTV anti-pollution flashover coating to be tested and the standard RTV anti-pollution flashover coating at room temperature for accelerated aging test when aged to the life threshold includes: The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the RTV anti-pollution flashover coating to be tested; The standard RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material and a group of samples are taken as a sample group of the standard RTV anti-pollution flashover coating; Perform an accelerated aging experiment on the sample group of the RTV anti-pollution flashover coating to be tested and the sample group of the standard RTV anti-pollution flashover coating, take at least one sample from the sample group of the RTV anti-pollution flashover coating to be tested and take at least one sample from the sample group of the standard RTV anti-pollution flashover coating to test the base rubber content at each aging time interval, until the base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold and the base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating when aged to the life threshold are determined, and the accelerated aging experiment is terminated; The base rubber content of the samples in the sample group of the RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing at room temperature of the RTV anti-pollution flashover coating to be tested when aged to the life threshold in an accelerated aging experiment; the base rubber content of the samples in the sample group of the standard RTV anti-pollution flashover coating to be tested when aged to the life threshold is determined as the base rubber content of the vulcanized silicone rubber material formed by curing at room temperature of the standard RTV anti-pollution flashover coating when aged to the life threshold in an accelerated aging experiment.

7. The lifespan assessment method according to claim 5 or 6, wherein: The RTV anti-pollution flashover coating to be tested is cured at room temperature to form a vulcanized silicone rubber material, including: the RTV anti-pollution flashover coating to be tested is cured in a constant temperature box at 25-30°C for 2-3 days to form a vulcanized silicone rubber material; The target RTV anti-pollution flashover coating is cured at room temperature to form a vulcanized silicone rubber material, including: the target RTV anti-pollution flashover coating is cured in a constant temperature box at 25-30° C. for 2-3 days to form a vulcanized silicone rubber material.

8. The lifespan assessment method according to claim 5 or 6, wherein: The base rubber content was tested by TGA test.

9. The lifespan assessment method according to claim 8, wherein: The TGA test is performed as follows: After cleaning the surface of the sample, place it in a TGA experimental instrument, pass nitrogen into the TGA experimental instrument to replace the gas in the TGA experimental instrument, set the test parameters, and perform TGA test on the sample in a nitrogen atmosphere; During the TGA test, the nitrogen gas flow rate is not less than 40 ml / min, the minimum temperature is 25-50°C, the maximum temperature is 800-1000°C, and the heating rate is 10-20°C / min.

10. The lifespan assessment method according to claim 9, wherein: The mass of the sample is 8±3 mg.

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