Electrical equipment live cleaning agent and preparation method thereof

Abstract

This invention discloses a live-line cleaning agent for power equipment and its preparation method, belonging to the field of cleaning agent technology. The live-line cleaning agent for power equipment comprises the following components in the indicated mass ratios: 40-60 parts organic solvent, 5-15 parts surfactant, 1-5 parts corrosion inhibitor, 10-20 parts co-solvent, 2-6 parts antioxidant, and 15-25 parts deionized water. The antioxidant of this invention employs a sterically hindered phenolic hydroxyl structure, which can efficiently quench free radicals and block oxidation chain reactions. This mechanism is particularly effective in charged, high-temperature, or oxygen-containing environments, reducing the probability of the cleaning agent itself being oxidized.

Description

Technical Field

[0001] This invention relates to the field of cleaning agent technology, specifically to a live-line cleaning agent for power equipment and its preparation method. Background Technology

[0002] Live-line cleaning is a crucial task in the operation and maintenance of power equipment. It effectively removes dirt, dust, and various oil stains from the equipment surface, thereby ensuring the normal operation of the equipment and reducing the probability of failure. However, traditional cleaning agents often have some shortcomings, especially in terms of antioxidant properties.

[0003] Many existing cleaning agents are prone to oxidation during use, which not only reduces the performance of the cleaning agent itself but may also pose potential hazards to electrical equipment. Once an oxidation reaction occurs, the chemical properties of the cleaning agent change, potentially leading to a significant reduction in cleaning effectiveness and an inability to thoroughly remove contaminants from the equipment surface. Furthermore, oxidation products may corrode the metal components of the equipment, shortening its lifespan and even causing electrical faults, affecting the stability and safety of the entire power system.

[0004] Furthermore, with increasingly stringent environmental protection requirements, some traditional cleaning agents contain heavy metal ions, volatile organic compounds, and substances harmful to human health and the environment, which no longer meet the needs of sustainable development in the modern power industry. Therefore, developing an environmentally friendly live-line cleaning agent with excellent antioxidant properties has become an urgent task.

[0005] This cleaning agent needs to possess high antioxidant capabilities to prevent itself from oxidizing during the cleaning process and to avoid adverse effects of oxidation products on electrical equipment. Furthermore, it should have excellent cleaning performance, effectively removing various contaminants from equipment surfaces. In addition, the production and use of this cleaning agent should minimize environmental pollution and harm to human health to meet the requirements of environmental protection and sustainable development. Summary of the Invention

[0006] This invention aims to address the problems of existing cleaning agents having weak antioxidant capacity, being prone to oxidation and failure, and potentially corroding equipment, by providing a live-line cleaning agent for power equipment that is highly resistant to oxidation, environmentally friendly, and efficient, in order to meet the needs of live-line cleaning of power equipment.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a live-line cleaning agent for electrical equipment, comprising the following components in the indicated mass ratios: 40-60 parts organic solvent, 5-15 parts surfactant, 1-5 parts corrosion inhibitor, 10-20 parts co-solvent, 2-6 parts antioxidant, and 15-25 parts deionized water.

[0008] The antioxidant is a compound represented by Formula 1:

[0009] Formula 1;

[0010] R1 is selected from: methyl, ethyl, tert-butyl, phenyl, methoxy.

[0011] Furthermore, the organic solvent is a mixed solution of toluene and ethyl acetate, with a mass ratio of 1:(1.5-2.5).

[0012] Furthermore, the surfactant is sodium dodecylbenzenesulfonate.

[0013] Furthermore, the corrosion inhibitor is benzotriazole.

[0014] Furthermore, the co-solvent is dipropylene glycol methyl ether.

[0015] Furthermore, the antioxidant is any one of the compounds shown in the following structures:

[0016] .

[0017] Furthermore, the method for synthesizing the antioxidant is as follows:

[0018] ;

[0019] Step 1: Raw material 1 and raw material 2 are subjected to Buchwald-Hartwig aromatic amination reaction to synthesize intermediate 1;

[0020] Step 2: Intermediate 1 is synthesized into intermediate 2 via a borate reaction;

[0021] Step 3: Intermediate 2 and raw material 3 are combined via Suzuki coupling reaction to synthesize an antioxidant.

[0022] A method for preparing a live-line cleaning agent for electrical equipment includes the following steps:

[0023] S1. The organic solvent and co-solvent are stirred and mixed evenly at 40-50°C to obtain a dispersion;

[0024] S2. Add the surfactant, corrosion inhibitor and antioxidant to the dispersion and stir and mix evenly at 50-65°C to obtain the base liquid;

[0025] S3. Add the deionized water to the base liquid, stir and mix evenly at 50-65℃, and cool to room temperature to obtain a live cleaning agent for power equipment.

[0026] Furthermore, the stirring speed is 200-400 rpm.

[0027] Furthermore, S2 is performed under a nitrogen atmosphere.

[0028] Application of a live-line cleaning agent for power equipment in cleaning transformers, circuit breakers and insulators operating at voltages below 500kV.

[0029] A live-line cleaning agent for power equipment is suitable for use in cleaning intelligent large transformers, circuit breakers, and insulators.

[0030] A live-line cleaning agent for electrical equipment relates to the field of wet electronic chemicals technology.

[0031] The core structure of the antioxidant described in this invention is an aromatic ring (benzene ring) containing a phenolic hydroxyl group (-OH). The hydrogen atom (OH) on the phenolic hydroxyl group is relatively reactive. During the use of cleaning agents, especially in charged, high-temperature, or oxygen / ozone-containing environments, organic solvents or other components may undergo oxidation reactions, generating alkyl free radicals or peroxy free radicals. The phenolic hydroxyl group of the antioxidant can efficiently provide hydrogen atoms, transforming destructive reactive free radicals into relatively stable, non-destructive products, thus interrupting the free radical chain oxidation reaction. The large aryl group in the antioxidant molecule of this invention physically hinders oxygen molecules or free radicals from easily approaching the phenolic hydroxyl group, reducing the rate at which it is unnecessarily consumed and improving stability. The steric hindrance structure makes the antioxidant molecule more durable and effective, and each molecule can quench more free radicals.

[0032] The antioxidant described in this invention utilizes a sterically hindered phenolic hydroxyl structure to efficiently quench free radicals and block oxidation chain reactions; the corrosion inhibitor forms a protective film on the metal surface of the equipment, and the surfactant emulsifies oxidation byproducts, jointly eliminating the risk of corrosion; the cosolvent bridges the organic and aqueous phases, improving the system's homogeneity; and deionized water dilutes flammability and enhances safety. Nitrogen protection and temperature / rate control processes during preparation further ensure component stability, ultimately achieving long-lasting antioxidant, zero-corrosion, and safe / environmentally friendly cleaning agents.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. Significantly enhanced antioxidant properties, reducing the risk of oxidative failure: The antioxidant of this invention adopts a sterically hindered phenolic hydroxyl structure, which can efficiently quench free radicals and block oxidation chain reactions. This mechanism is particularly effective in charged, high-temperature, or oxygen-containing environments, reducing the probability of the cleaning agent itself being oxidized.

[0035] 2. Significantly reduced equipment corrosion risk and enhanced protection: By forming a protective film on the metal surface with a corrosion inhibitor, combined with the emulsification and removal of oxidation byproducts by surfactants, this invention achieves a synergistic anti-corrosion mechanism. This mechanism significantly reduces the erosion of metal components of power equipment by oxidation products. Performance test trends show that the cleaning agent results in a higher surface insulation resistance value after coating and less performance degradation after aging, reflecting an overall reduction in equipment corrosion risk and contributing to extending the lifespan and operational stability of power equipment.

[0036] 3. Enhanced safety and environmental performance, meeting insulation requirements: The co-solvent bridges the organic and aqueous phases, improving system homogeneity, while deionized water dilutes flammability; the preparation process (such as nitrogen protection and temperature / rate control) further ensures component stability. These mechanisms collectively achieve the cleaning agent's safe and environmentally friendly characteristics. Performance testing trends show stronger initial electrical insulation performance and better maintenance after aging, while meeting environmental requirements, thus improving overall application safety in electrified environments. Attached Figure Description

[0037] Figure 1 The antioxidant 1 described in this invention 1 HNMR image.

[0038] Figure 2 This is the method for synthesizing the antioxidant described in this invention. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Synthesis example 1

[0041] Synthesis of Antioxidant 1:

[0042] ;

[0043] Step 1: Under nitrogen protection, 20 g of starting material 1, 31.21 g of starting material 2, 14.78 g of sodium tert-butoxide, 2.11 g of tris(dibenzylacetone)dipalladium, 0.7 g of tri-tert-butylphosphine, and 250 g of toluene were added to the reaction system. The mixture was heated to 120 °C and refluxed for 12 h. After the reaction was completed, the temperature was slightly lowered, and the mixture was filtered using diatomaceous earth to remove salts and catalysts. The filtrate was cooled to room temperature, washed three times with water, and the organic phase was retained. The aqueous phase was then extracted with ethyl acetate. The organic phases were combined, evaporated to dryness, and subjected to silica gel column chromatography using a mixture of petroleum ether and ethyl acetate as eluent to obtain 23.98 g of intermediate 1. Mass spectrometry (MS) [MS+1]: 517.

[0044] Step 2: Under nitrogen protection, 23.98 g of intermediate 1 and 250 g of ultra-dry tetrahydrofuran were added to the reaction system. The temperature was lowered to -70°C, and 3.12 g of n-butyllithium was added dropwise. After the addition was complete, the mixture was stirred for 1 hour. Then, 13.07 g of triisopropyl borate was added dropwise. After the addition was complete, the mixture was allowed to rise naturally to room temperature and reacted for 10 hours. After the reaction was completed, the solvent was evaporated to obtain 15.61 g of intermediate 2. Mass spectrometry (MS) [MS+1]: 483.

[0045] Step 3: Under nitrogen protection, add 15.61 g of intermediate 2, 12.919 g of raw material 3, 6.42 g of sodium tert-butoxide, 1.16 g of tetra(triphenylphosphine)palladium, and 170 g of a mixed solution of toluene, ethanol, and water (volume ratio 2:1:1) to the reaction system. Heat to 95 °C and reflux for 10 hours. Turn off the heating, cool to room temperature, allow to stand and separate the phases. Extract the aqueous phase twice with ethyl acetate, combine the organic phases, wash three times with water, evaporate to dryness, and perform silica gel column chromatography using a mixture of petroleum ether and ethyl acetate as eluent to obtain 17.81 g of antioxidant 1.

[0046] Final product structure identification:

[0047] Mass spectrometry (MS) of antioxidant 1 [MS+1]: 680;

[0048] Antioxidant 1 1 HNMR-deuterated chloroform: δ9.07(s,1H),8.34(m,1H),8.04(s,1H),7.99-7.84(m,3H),7.75(dd,1H),7.72(s,1H),7.55(dd,1H),7.31-7.21(m,1H), 7.05(dd,1H),7.01-6.90(m,3H),6.75(dd,1H),6.65(s,1H),4.86(s,1H),2.75(m,4H),2.49(d,3H),1.92(s,4H),1.82-1.64(m,4H).

[0049] Synthesis Example 2-Synthesis Example 5

[0050] In Synthesis Examples 2-5, antioxidants 2 and 5 were synthesized sequentially, following the same synthesis method as in Synthesis Example 1, except that raw material 1 was replaced, while the rest remained the same as in Synthesis Example 1. The specific structures of raw material 1, antioxidants 2-5, and their MS [MS+1] data are shown in Table 1.

[0051] Table 1.

[0052]

[0053] Example 1

[0054] Preparation of a live-line cleaning agent for electrical equipment:

[0055] The components in the following mass ratios are: 33 parts organic solvent (a mixed solution of toluene and ethyl acetate in a mass ratio of 1:2), 10 parts surfactant (sodium dodecylbenzenesulfonate), 3 parts corrosion inhibitor (benzotriazole), 15 parts cosolvent (dipropylene glycol methyl ether), 4 parts antioxidant (antioxidant 1 prepared in Synthesis Example 1), and 20 parts deionized water.

[0056] Preparation method:

[0057] S1. Add the organic solvent and co-solvent to the reaction vessel, and stir and mix at 45°C and 300 rpm for 30 minutes to obtain a dispersion;

[0058] S2. Add the surfactant, corrosion inhibitor and antioxidant to the dispersion, and under nitrogen atmosphere protection, heat to 60°C and stir at 350 rpm for 1 hour to obtain the base liquid.

[0059] S3. Add the deionized water to the base solution and stir at 60°C and 300 rpm for 40 minutes. Stop heating and allow to cool naturally to room temperature (25°C) to obtain a pale yellow transparent liquid, which is a live-line cleaning agent for electrical equipment.

[0060] Examples 2-5

[0061] The preparation of a live-line cleaning agent for power equipment is carried out by referring to the preparation method of Example 1, except that the antioxidant is replaced in sequence with the antioxidants prepared in Synthesis Examples 2-5, and the rest is the same as in Example 1.

[0062] Comparative Example 1

[0063] The preparation of a live-line cleaning agent for electrical equipment is carried out according to the preparation method of Example 1, except that the antioxidant is replaced with comparative compound 1, and the rest is the same as in Example 1.

[0064] Comparative compound 1: .

[0065] Comparative Example 2

[0066] The preparation of a live-line cleaning agent for power equipment is the same as in Example 1, except that the antioxidant is not added.

[0067] Comparative Example 3

[0068] The preparation of a live-line cleaning agent for electrical equipment is carried out according to the preparation method of Example 1, except that the antioxidant is replaced with antioxidant 245 (CAS: 36443-68-2), and the rest is the same as in Example 1.

[0069] Comparative Example 4

[0070] The preparation of a live-line cleaning agent for electrical equipment is carried out according to the preparation method of Example 1, except that the antioxidant is replaced with antioxidant 1790 (CAS: 40601-76-1), and the rest is the same as in Example 1.

[0071] Comparative Example 5

[0072] The preparation of a live-line cleaning agent for power equipment is carried out by referring to the preparation method of Example 1, except that the mass parts of the corrosion inhibitor are replaced with 10 parts and the mass parts of the co-solvent are replaced with 30 parts, while the rest remains the same as in Example 1.

[0073] The live-line cleaning agent for power equipment prepared in the examples and comparative examples was tested.

[0074] 1. Breakdown voltage test: Using a standard oil cup tester, place the cleaning agent sample between the electrodes, gradually increase the voltage until breakdown, and record the breakdown value (kV). Test conditions: room temperature 25°C, humidity 60%, sample volume 50mL, data are shown in Table 2.

[0075] 2. Surface insulation resistance test: A high resistance meter was used to measure the resistance (Ω) of the copper plate after the cleaning agent was applied. The data are shown in Table 2.

[0076] 3. Weather resistance test: Place the sample in a QUV accelerated aging instrument and set the parameters as follows: UVB wavelength 313nm, irradiance 0.71W / m 2 The system underwent a cyclic test (8 hours of UV exposure + 4 hours of condensation) for a total of 2400 hours. Afterward, the breakdown voltage was measured and the breakdown value (kV) was recorded. The data are shown in Table 2.

[0077] Table 2.

[0078] Breakdown value (kV) Surface insulation resistance (Ω) Weathering breakdown value (kV) Example 1 75 <![CDATA[1.2×10 12 ]]> 65 Example 2 70 <![CDATA[1.1×10 12 ]]> 62 Example 3 68 <![CDATA[1.5×10 12 ]]> 60 Example 4 72 <![CDATA[1.3×10 12 ]]> 64 Example 5 65 <![CDATA[9.5×10 11 ]]> 58 Comparative Example 1 55 <![CDATA[7.4×10 11 ]]> 35 Comparative Example 2 51 <![CDATA[5.2×10 11 ]]> 20 Comparative Example 3 52 <![CDATA[9.7×10 11 ]]> 41 Comparative Example 4 54 <![CDATA[9.4×10 11 ]]> 42 Comparative Example 5 40 <![CDATA[8.6×10 11 ]]> 31

[0079] Based on the data analysis in Table 2, the overall trend clearly shows that the example group (cleaning agents using the specific antioxidants of this invention) is significantly superior to the comparative group (cleaning agents using substitutes or lacking key components) in terms of electrical insulation performance and anti-aging stability. Specifically, the breakdown values ​​(original insulation performance) of the examples are generally higher, reflecting stronger initial insulation capabilities; the surface insulation resistance values ​​are also generally better, reflecting more effective insulation protection; and the weathering breakdown values ​​(performance after aging) also show better maintenance effects, indicating that the examples have more outstanding anti-oxidation and anti-deterioration capabilities in long-term use. In contrast, the comparative group shows a downward trend in all indicators due to the lack of antioxidants, unreasonable structure, or imbalanced component ratios, especially with more significant performance degradation after aging. This advantage mainly stems from the sterically hindered phenolic hydroxyl structure of the antioxidants of this invention, which efficiently quenches free radicals and blocks oxidation chain reactions. Combined with the synergistic effect of corrosion inhibitors and surfactants, it not only improves the stability of the cleaning agent but also reduces the risk of corrosion of equipment by oxidation products. Nitrogen protection and temperature and rate control in the preparation process further ensure performance consistency, ultimately achieving a balance between safety, environmental protection, and long-term protection.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A live-line cleaning agent for electrical equipment, characterized in that, It is composed of the following components in the indicated mass ratios: 40-60 parts organic solvent, 5-15 parts surfactant, 1-5 parts corrosion inhibitor, 10-20 parts co-solvent, 2-6 parts antioxidant, and 15-25 parts deionized water. The antioxidant is a compound represented by Formula 1: Formula 1; R1 is selected from: methyl, ethyl, tert-butyl, phenyl, or methoxy; The organic solvent is a mixed solution of toluene and ethyl acetate, with a mass ratio of 1:(1.5-2.5). The surfactant is sodium dodecylbenzenesulfonate; The corrosion inhibitor is benzotriazole; The cosolvent is dipropylene glycol methyl ether.

2. A method for preparing a live-line cleaning agent for electrical equipment as described in claim 1, characterized in that, Includes the following steps: S1. The organic solvent and co-solvent are stirred and mixed evenly at 40-50°C to obtain a dispersion; S2. Add the surfactant, corrosion inhibitor and antioxidant to the dispersion and stir and mix evenly at 50-65°C to obtain the base liquid; S3. Add the deionized water to the base liquid, stir and mix evenly at 50-65°C, and cool to room temperature to obtain the electrical equipment live cleaning agent.

3. The method for preparing the live-line cleaning agent for power equipment according to claim 2, characterized in that, The stirring speed is 200-400 rpm.

4. The method for preparing the live-line cleaning agent for power equipment according to claim 2, characterized in that, The S2 operation is performed under a nitrogen atmosphere.

5. The application of the live-line cleaning agent for power equipment according to claim 1 in cleaning transformers, circuit breakers and insulators operating at voltages below 500kV.

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