CN113138156B - Acid rain simulation accelerated aging method and application thereof - Google Patents
Acid rain simulation accelerated aging method and application thereof Download PDFInfo
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Abstract
The invention discloses a method for simulating accelerated aging of acid rain, which comprises the following steps of A, selecting an area with acid rain as a research object, and obtaining the pH mean value of the acid rain in nearly n years and the days t of the annual rainfall through an environmental condition bulletin and relevant meteorological data 1 (ii) a B, converting into annual average H according to the annual acid rain pH value of the region + Concentration c 1 (ii) a C, mean by year H + Concentration c 1 The acid rain concentration for the design test is c 2 Preparing an acid solution; d, treating the material to be measured in an acid solution for a period of time t 2 (ii) a And E, performing performance test on the material to be tested. The method can achieve the purpose of approximately evaluating the effect of acid rain on the composite insulator shed under different equivalent years through the effect of the acid solution with a certain concentration in a certain time period. The invention also discloses application of the acid rain simulation accelerated aging method in silicone rubber aging.
Description
Technical Field
The invention relates to the technical field of material detection methods, in particular to a simulated acid rain accelerated aging method and application thereof.
Background
The composite insulator is an important insulation component in an electric power system, the outer insulation silicon rubber of the composite insulator is widely concerned due to excellent hydrophobicity, hydrophobic mobility, pollution flashover resistance and the like, and the outer insulation is used as a barrier of the inner insulation and plays a key role in the service life of the composite insulator. In the operation process of the composite insulator, the outer insulation silicon rubber of the composite insulator is directly exposed to the atmospheric environment and inevitably contacts acid rain, so that the influence of the acid rain on the outer insulation of the silicon rubber needs to be concerned.
At present, most researches on the influence of acid on the silicone rubber cannot be combined with the actual acid rain condition and the acid rain amount is quantified, and particularly in an acid rain area, the influence of acid rain on the silicone rubber in a composite insulator for a certain running time cannot be predicted, so that the safety of the composite insulator external insulation in a long-term running process cannot be evaluated and guaranteed.
Disclosure of Invention
Aiming at the defects of the prior art, one of the purposes of the invention is to provide a method for simulating acid rain accelerated aging, which selects hydrogen ions (H) based on acid rain conditions in different areas + ) The concentration is used as a calibration parameter, the hydrogen ion quantity acting on a unit area is obtained according to the annual average acid rain acting time of a certain area, and the hydrogen ion quantity is acted by an acid solution with a certain concentration in a certain time periodThe method can achieve the purpose of approximately evaluating the effect of acid rain on the composite insulator shed under different equivalent years.
In order to achieve the purpose, the technical means adopted by the invention are as follows: a simulated acid rain accelerated aging method comprises the following steps,
selecting the area with acid rain as the research object, obtaining the pH value average value of the acid rain in the year and the days t of rainfall in the year in the near n years according to the bulletin of environmental conditions and relevant meteorological data 1 ；
B, converting into annual average H according to the annual acid rain pH value of the region + Concentration c 1 ；
C, according to the annual average H + Concentration c 1 The acid rain concentration for the design test is c 2 Preparing an acid solution;
d, treating the material to be detected in an acid solution for a period of time t 2 ；
And E, performing performance test on the material to be tested.
Selection of hydrogen ion (H) + ) The concentration is used as a calibration parameter, the hydrogen ion amount acting on a unit area is obtained according to the annual average acid rain acting time in a certain area, and the purpose of approximately evaluating the effect of equivalent acid rain on the material to be measured under different years can be achieved through the action of an acid solution with a certain concentration in a certain time period.
Preferably, in step A, the pH mean value of annual acid rain is 4.42, and the number of days of annual rainfall t 1 It was 132 days. By utilizing the deposition effect of acid rain, the annual average pH of the Chongqing Dazu in 2017-2019 is selected as a reference index.
Preferably, in step C, according to the equivalence principle, within a unit area, t 1 *c 1 ＝t 2 *c 2 . The method comprises the steps of predicting and quantifying the acid rain amount in different years, processing the material to be detected by a simulated acid rain accelerated aging method, and performing performance characterization on the aged material to be detected in corresponding years, so that the evaluation on the influence of the acid rain on the material to be detected in different operation time is realized, and the method has important significance on the operation and maintenance of the operation equipment in an acid rain area and the prediction of the service life.
Preferably, in step C, the pH of the acid solution is 2.6. According to the equivalence principle, the acid solution treatment for 2 days in the test can be approximately equivalent to the acid rain effect of a typical acid rain area in one year, and the acceleration factor of the test is 66. The acid aging time is designed to be 90 days, which can correspond to the aging in the typical acid rain area of China for 45 years.
Preferably, the acid solution is a homogeneous solution comprising deionized water, diatomaceous earth, caSO 4 、HNO 3 、NH 4 NO 3 、NaF、NaCl、KCl、MgCl 2 、(NH 4 ) 2 SO 4 . The acid solution is prepared according to the actual components of the acid rain, so that the actual condition of acid rain corrosion can be better simulated.
Preferably, in step D, for t 2 And taking different values, respectively putting a plurality of parts of materials to be detected into the acid solution and soaking for different times to obtain the materials to be detected simulating different ages of acid rain aging.
Preferably, in step E, the performance test includes an infrared spectrum test, and the change of the surface chemical group of the material to be tested is analyzed, the test mode is a reflection mode, and the wavelength range is 4000-500 cm -1 The number of scanning times is 32, and the resolution is 4cm -1 . In order to evaluate the change of chemical groups of the material to be tested in the acid aging process, a test piece of the material to be tested, which is equivalently aged for 30 years and 45 years, is taken to carry out a microscopic infrared test, and a control group is arranged for comparison.
Preferably, in step E, the performance test includes XPS test, which analyzes the chemical element composition and the chemical electronic configuration of the surface of the material to be tested, the test voltage is 12kV, the scan range is 0-1350 eV, and the energy step is 0.5eV. The material to be detected is taken for XPS analysis, and when the material to be detected is silicon rubber, si is taken as a characteristic element in the silicon rubber, and plays an important role in forming a main chain and a side chain of the silicon rubber. Therefore, the change of the chemical structure of the silicon rubber material under the acid aging condition with different equivalent ages can be obtained by evaluating the chemical state of Si on the surface of the sample with different treatment times.
Preferably, in step E, the performance test includes SEM test, the surface morphology of the material to be tested is observed, gold spraying treatment is performed before the test, the applied voltage is 10kV, the scanning range is 0-20 keV, and the test magnification is 1000 times. Through the analysis of the surface chemical structure, the influence of acid treatment on the chemical groups and the configuration of the surface of the material to be detected is known, and in order to further analyze the influence of acid on the surface physical structure of the material to be detected in different equivalent aging time, SEM test is carried out on the material to be detected aged in different time so as to analyze the change of the microscopic physical structure of the surface of the material to be detected.
In view of the shortcomings of the prior art, one of the objects of the present invention is to provide a method for simulating acid rain accelerated aging for the application of silicone rubber aging. The establishment of the acid rain quantification model provides a relatively accurate theoretical basis for the real-time state evaluation and maintenance of the composite insulator in the acid rain region.
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FIG. 1 is a schematic diagram of steps of a simulated acid rain accelerated aging method according to an embodiment of the invention;
FIG. 2 is an infrared spectrum of a test material after acid aging according to an embodiment of the present invention;
FIGS. 3 (a), (b) and (c) are XPS test spectra of Si chemical configurations of samples after 30 years of equivalent acid aging, samples after 45 years of equivalent acid aging and a blank control, respectively, of an embodiment of the present invention;
FIG. 4 is an XPS test spectrum of different chemical configuration ratios of Si element of a material to be tested after acid aging according to an embodiment of the present invention;
FIGS. 5 (a), (b) and (c) are SEM test patterns of a sample after equivalent acid aging for 30 years, a sample after equivalent acid aging for 45 years, and a blank control group, respectively, of an example of the present invention;
FIGS. 6 (a), (b) and (c) are graphs showing the variation of mechanical properties of silicone rubber under different acid equivalent aging years for examples of the present invention.
Detailed Description
As required, detailed embodiments of the present invention are disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in combination with features that may not be explicitly disclosed herein.
As shown in fig. 1, the present embodiment provides a simulated acid rain accelerated aging method, which includes the following steps,
a, selecting the area with acid rain as the research object, obtaining the pH value average value of the acid rain in nearly n years and the days t of rainfall in nearly n years through the environmental condition bulletin and the related meteorological data 1 ；
B, converting into annual average H according to the annual acid rain pH value of the region + Concentration c 1 ；
C, according to the annual average H + Concentration c 1 C acid rain concentration for design test 2 Preparing an acid solution;
d, treating the material to be detected in an acid solution for a period of time t 2 ；
And E, performing performance test on the material to be tested.
Selection of hydrogen ion (H) + ) The concentration is used as a calibration parameter, the hydrogen ion amount acting on a unit area is obtained according to the annual average acid rain acting time in a certain area, and the purpose of approximately evaluating the effect of acid rain on the material to be measured under different equivalent years can be achieved through the action of an acid solution with a certain concentration in a certain time period.
In this example, in step A, the pH mean value of the annual acid rain is 4.42, and the number of days of annual rainfall t 1 It was 132 days. The annual average pH of the Chongqing Dazu in 2017-2019 is selected as a reference index by utilizing the deposition effect of acid rain. Data of Chinese environmental condition bulletin show that Chongqing Dazu is one of representative acid rain areas, the annual average pH value of precipitation of the Chongqing Dazu in 2017-2019 is 4.42, 4.34 and 4.51 respectively, the pH average value is about 4.42, and the annual average number of days of rainfall in the area is 132 days.
In other embodiments, other regions may be selected as research objects according to the data display of the "communique of environmental conditions of China". Acid rain is a regional emission of sulfur dioxide (SO) 2 ) And nitrogen oxides (NOx) or the like in the presence of waterThe product formed under the condition generally refers to the precipitation with the pH value less than 5.6 as acid rain, and the acid rain in China has serious harm and is one of three acid rain areas in the world.
In the present embodiment, in step C, according to the principle of equivalence, within a unit area, t 1 *c 1 ＝t 2 *c 2 . The method has the advantages that the acid rain amount in different ages is estimated and quantified, the material to be detected is processed by a simulated acid rain accelerated aging method, and the aged material to be detected is subjected to performance characterization under the corresponding age, so that the influence of acid rain on the material to be detected in different running times is evaluated, and the method has important significance for the operation and maintenance and the life estimation of running equipment in an acid rain area.
In this embodiment, the material to be tested is silicone rubber, and a silicone rubber test piece is prepared for testing. The material to be measured is the same as the material of the silicon rubber umbrella skirt on the composite insulator, so that the composite insulator can be subjected to acid rain aging evaluation. In other embodiments, the material to be tested is not specifically limited, and may be any material subject to corrosion and aging in an acid rain environment, and the method of this embodiment is used to evaluate the acid rain aging of the material to be tested.
In this example, the pH of the acid solution was 2.6 in step C. According to the equivalent principle, the acid solution treatment for 2 days in the test can be approximately equivalent to the acid rain effect of a typical acid rain area in one year, and the acceleration factor of the test is 66. The acid aging time is designed to be 90 days, which can correspond to the aging in the typical acid rain area of China for 45 years. The equivalent age is shown in table 1 for different aging times.
TABLE 1 equivalent years corresponding to different aging times
In other embodiments, different acceleration factors may be designed, so that the pH of the acid solution changes according to the change of the acceleration factor, and thus, c 2 While the overall equivalence relation is not changed, the above formula t can still be used 1 *c 1 ＝t 2 *c 2 Performing equivalent calculation to obtain t 2 Of the corresponding value of (a).
In this embodiment, the acid solution is a homogeneous solution, and includes deionized water, diatomaceous earth, and CaSO 4 、HNO 3 、NH 4 NO 3 、NaF、NaCl、KCl、MgCl 2 、(NH 4 ) 2 SO 4 . The acid solution is prepared according to the actual components of the acid rain, so that the actual condition of acid rain corrosion can be better simulated. The concentrations and ratios of the reagents in the acid solutions are shown in Table 2.
TABLE 2 concentration and ratio of acid solution reagent
In other embodiments, an acid solution may be configured according to the acid rain sampling result of the area under study, so as to reduce the actual acid rain components of the acid rain area as much as possible, thereby facilitating obtaining a more accurate result.
In this embodiment, in step D, for t 2 And taking different numerical values, respectively putting a plurality of parts of materials to be detected into the acid solution and soaking for different times to obtain the materials to be detected simulating the aging of acid rain for different years.
In this embodiment, in step E, the performance test includes infrared spectroscopy (FTIR), which analyzes the change of the surface chemical groups on the material to be tested, i.e. the silicone rubber shed, in a reflective mode and with a wavelength range of 4000-500 cm -1 The number of scanning times is 32, and the resolution is 4cm -1 . In order to evaluate the change of the chemical groups of the material to be tested in the acid aging process, a silicon rubber test piece which is aged for 30 years and aged for 45 years is taken to carry out micro infrared test, and a control group is arranged for comparison. As shown in fig. 2, the infrared spectrogram of the material to be tested after acid aging shows the chemical group change of the silicone rubber after the material to be tested undergoes acid aging. The silicon rubber has obvious characteristic infrared peak, wherein 788cm -1 、1009cm -1 、1259cm -1 、2960cm -1 、3431cm -1 Respectively represent Si-C, si-O-Si, si (CH) 3 ) 2 Infrared of C-H and-OHAnd (4) peak position. As can be seen from FIG. 2, during the equivalent acid aging time increased to 45 years, the characteristic IR peaks decreased in addition to the increase in-OH peak intensity, wherein the Si-O-Si and Si- (CH) groups are more visually observed in the enlarged portion shown on the left side of FIG. 2 3 ) 2 The peak intensity of (a) decreases. When the acid acts on the silicon rubber, the main chain and the side chain structure of the organic silicon are slightly broken under the influence of the acid solution, and organic groups are partially reduced, so that the organic silicon on the surface has certain loss, and inorganic fillers including aluminum hydroxide and white carbon black are partially exposed on the surface.
In this embodiment, in step E, the performance test includes XPS test, which analyzes the chemical element composition and the chemical electronic configuration of the surface of the material to be tested, the test voltage is 12kV, the scan range is 0-1350 eV, and the energy step is 0.5eV. And (3) carrying out XPS analysis on the material to be detected, wherein Si is used as a characteristic element in the silicon rubber when the material to be detected is the silicon rubber, and plays an important role in forming a main chain and a side chain of the silicon rubber. Therefore, the change of the chemical structure of the silicon rubber material under different equivalent-age acid aging conditions can be obtained by evaluating the chemical state of Si on the surface of the sample at different treatment times. Fig. 3 (a), (b) and (c) are XPS test spectra of Si chemical configurations for equivalent acid aging for 30 years, 45 years and blank control, respectively. As can be seen from FIG. 3, the chemical configuration of Si varies with aging time, mainly represented by Si (O) during aging 3 And Si (O) 4 To obtain Si (O), the area fitting method is used to fit the areas of different configurations of Si, and the result is shown in FIG. 4 2 The peak area of (A) decreased from 78.99% to 65.25%, and accordingly, si (O) 3 Increased from 14.96% to 24.92%, si (O) 4 An increase from 6.04% to 9.83% indicates the presence of a partial conversion of the organosilicon to inorganic silicon. Through the analysis of the influence of the infrared spectrum on the chemical groups of the silicone rubber, the silicone rubber has certain breakage of the main chain and the side chain of the organic silicon in the acid action process, so that conditions are provided for the recombination of the generated inorganic chain links, the inorganic phenomenon is generated after aging, and the XPS detection chemical configuration and the micro infrared detection chemicalThe results for the chemical groups showed consistency.
In this embodiment, in step E, the performance test includes SEM test, the surface morphology of the material to be tested is observed, and before the test, the metal spraying treatment is performed, the applied voltage is 10kV, the scanning range is 0 to 20keV, and the test magnification is 1000 times. And analyzing the surface chemical structure to obtain that the acid treatment has certain influence on the chemical groups and the configuration of the surface of the material to be detected, and performing SEM (scanning electron microscope) test on the material to be detected aged at different time to analyze the change of the microscopic physical structure of the surface of the material to be detected in order to further analyze the influence of the acid on the physical structure of the surface of the material to be detected in different equivalent aging time.
Fig. 5 (a), (b) and (c) are SEM test charts of the sample and the blank after equivalent acid aging for 30 years and 45 years, respectively, and the surface roughness increases and the particulate matter increases with the aging time, but no obvious defects such as cracks and holes appear. The FTIR and XPS analysis result shows that the loss of the organic silicon and the inorganic phenomenon coexist, on one hand, the inorganic filler particles of aluminum hydroxide are exposed due to the loss of the organic silicon; on the other hand, the inorganic silicon component of the surface increases due to the conversion of the organosilicon to the inorganic silicon, which also increases the roughness of the surface. When the composite insulator external insulation silicon rubber material is applied in an actual external environment, certain aging generally inevitably exists, and the aging degree determines whether the material can continuously meet corresponding functional requirements. For the external insulation material with serious aging, obvious holes and cracks are often generated on the microscopic surface, thereby seriously affecting the mechanical and electrical properties of the material. And the aging degree is relatively light in combination with the microstructure of the sample after equivalent acid aging for 45 years.
In this example, the silicone rubber after aging for a certain period of time was taken out, and was left to stand in a laboratory environment according to the general procedures for sample preparation and adjustment, and the aged samples were subjected to hardness, tensile strength, and elongation at break tests, respectively. As shown in fig. 6 (a), (b) and (c), the change in mechanical properties of the silicone rubber with different acid equivalent aging years. Fig. 6 (a) is a hardness test chart, fig. 6 (b) is a tensile strength test chart, fig. 6 (c) is a tensile elongation at break test chart, and hardness, tensile strength and tensile elongation at break are important indicators for characterizing the mechanical properties of the outer insulation of the composite insulator, and are important guarantees for preventing the outer insulation from being damaged. Generally, the elongation at break decreases with increasing stress at elongation and hardness. The results show that as the aging time increases, the hardness increases, the tensile strength tends to increase relative to that before the treatment, while the elongation at break goes through a process of increasing and then decreasing. Due to the existence of the acid aging process, the molecular chains generate certain slippage due to the reduction of a small amount of organic polymer chains, so that the elongation at break is temporarily increased, the elasticity is relatively reduced, the hardness is increased, and the elongation at break is reduced due to the relative reduction of organic silicon and the relative increase of inorganic silicon. The increase in tensile strength may be related to an increase in the degree of crosslinking of the silicone rubber under the action of acid. In general, after equivalent aging for 45 years, the hardness is below 68, the elongation at break is above 360%, and the elastomer still has obvious characteristics, which indicates that the acid action process is slightly aged.
In this example, the test piece aged in equivalent acid rain for 45 years was subjected to the tracking resistance test, and no overcurrent was generated during the entire voltage application, and the erosion depths of samples nos. 1 to 5 were 0.43mm, 0.87mm, 0.90mm, 1.35mm, and 0.8mm, respectively, and were all less than 2.5mm. The tracking resistance is a discharge mode formed under the participation of electrolyte on the solid insulation surface, the amount and concentration of the surface electrolyte can influence the tracking resistance, the introduction of acid aging factors can increase the surface conductivity and the surface current, and the aging resistance of the material in an acid environment can be reflected during the test. In the process of the tracking resistance test, when heat generated by discharge reaches the bonding energy of the silicon rubber material, chemical bonds are broken to form a low-resistance channel of carbon, and the lower the bonding energy is, the easier the surface of the material is ablated. After equivalent acid aging for 45 years, the corrosion depth is still shallow, which shows that the integral chemical bond energy of the surface of the material is still larger, and the operation requirement of the external environment can be met.
In this embodiment, a hydrophobicity test is performed on the silicone rubber shed to be tested. The silicon rubber material can show unique hydrophobicity, which is determined by the non-polarity and spiral distribution of side chain methyl on one hand, and has a certain relation with the small molecule migration phenomenon of the silicon rubber material on the other hand. The quality of the hydrophobicity directly determines the capability of the composite insulator in preventing flashover of external insulation during the operation process, so that the surface hydrophobicity of the material after acid treatment needs to be analyzed. Taking samples after 15-year, 30-year and 45-year equivalent aging treatment, and respectively carrying out hydrophobicity analysis on the samples by using a static contact angle method to obtain surface hydrophobic contact angles of 107.7 degrees, 106.2 degrees and 103.9 degrees which are respectively larger than 100 degrees after 15-year, 30-year and 45-year equivalent aging treatment, wherein the initial contact angle of a blank control group is 105.7 degrees, which shows that the influence on the hydrophobicity of the silicone rubber is small after the acid rain under the concentration condition is acted for different time. According to the results of infrared spectroscopy, the acid aging can cause partial fracture of the silicone rubber organic side chains on the surface of the material, so that the polarity is increased, and certain negative effects can be generated on the hydrophobicity. However, it was found that after an equivalent aging period of 45 years, the water repellency still does not change significantly, which may be related to the increase of the roughness of the material surface, and in addition, the water repellency migration property of the silicone rubber material itself can play a positive role in the water repellency.
In other embodiments, the design of the test can be performed according to the performance characteristics of the material to be tested and the application environment, so as to verify different performances of the material to be tested and achieve the purpose of research.
The acid rain accelerated aging simulation method of the embodiment establishes an acid rain quantification model and carries out long-term quantitative acid accelerated aging on the silicon rubber. The structural and performance changes of the silicon rubber under different acid aging times are systematically researched by adopting microscopic, apparent, mechanical and electrical characterization means. Test results show that with the increase of the equivalent acid aging time, the main chain and the side chain of the silicone rubber organic silicon are gradually broken, and a certain inorganic silicon transformation exists in the surface chemical configuration; the reduction of the silicone exposes the inorganic filler to the surface, and there is a certain increase in roughness. Macroscopically, the hardness and the tensile strength are increased, the elongation at break is increased and then decreased, the water repellency is not obviously changed, and the tracking resistance and the corrosion resistance meet 4.5kV. After 45 years of equivalent acid treatment, the silicone rubber showed slight aging. The establishment of the acid rain quantification model provides a relatively accurate theoretical basis for the real-time state evaluation and maintenance of the composite insulator in the acid rain region.
The invention also provides application of the simulated acid rain accelerated aging method, and the simulated acid rain accelerated aging method is applied to silicone rubber aging. The establishment of the acid rain quantification model provides a relatively accurate theoretical basis for the real-time state evaluation and maintenance of the composite insulator in the acid rain region.
While the invention has been described with reference to the above disclosure and features, it will be understood by those skilled in the art that various changes and modifications in the above constructions and materials can be made, including combinations of features disclosed herein either individually or in any combination, as appropriate, without departing from the spirit of the invention. Such modifications and/or combinations are within the skill of the art to which the invention relates and are within the scope of the following claims.
Claims (9)
1. A simulated acid rain accelerated aging method is characterized in that: comprises the following steps of (a) carrying out,
selecting the area with acid rain as the research object, obtaining the pH value average value of the acid rain in the year and the days t of rainfall in the year in the near n years according to the bulletin of environmental conditions and relevant meteorological data 1 ；
B, converting into annual average H according to the annual acid rain pH average value of the region + Concentration c 1 ；
C, according to the annual average H + Concentration c 1 C acid rain concentration for design test 2 Preparing acid solution according to the equivalent principle in a unit area, t 1 *c 1 ＝t 2 *c 2 ；
D, treating the material to be measured in the acid solution for a period of time t 2 ；
And E, carrying out performance test on the material to be tested.
2. As claimed inThe simulated acid rain accelerated aging method of claim 1 is characterized in that: in the step A, the pH mean value of the annual acid rain is 4.42, and the number of days of annual rainfall t 1 It was 132 days.
3. The method of simulating acid rain accelerated aging of claim 2, wherein: in step C, the pH of the acid solution is 2.6.
4. The method of simulating acid rain accelerated aging of claim 1, wherein: the acid solution is homogeneous solution comprising deionized water, diatomaceous earth, and CaSO 4 、HNO 3 、NH 4 NO 3 、NaF、NaCl、KCl、MgCl 2 、(NH 4 ) 2 SO 4 。
5. The method of simulating acid rain accelerated aging of claim 1, wherein: in said step D, for t 2 And taking different numerical values, respectively putting a plurality of parts of the material to be detected into the acid solution and soaking for different times to obtain the material to be detected simulating the aging of acid rain for different years.
6. The method of simulating acid rain accelerated aging of claim 1, wherein: in the step E, the performance test comprises an infrared spectrum test, the change of the surface chemical groups of the material to be tested is analyzed, the test mode is a reflection mode, and the wavelength range is 4000-500 cm -1 The number of scanning times is 32, and the resolution is 4cm -1 。
7. The method of simulating acid rain accelerated aging of claim 1, wherein: in the step E, the performance test includes XPS test, which analyzes the chemical element composition and the chemical electronic configuration on the surface of the material to be tested, the test voltage is 12kV, the scanning range is 0 to 1350eV, and the energy step is 0.5eV.
8. The method of simulating acid rain accelerated aging of claim 1, wherein: in the step E, the performance test comprises SEM test, the surface appearance of the material to be tested is observed, gold spraying treatment is carried out before the test, the applied voltage is 10kV, the scanning range is 0-20 keV, and the test magnification is 1000 times.
9. Use of the simulated acid rain accelerated aging method of any of claims 1 to 8 in the aging of silicone rubber.
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