A protective cover with self-cleaning function for drop-out fuse and a preparation method thereof

Abstract

The application discloses a protective cover with a self-cleaning function for a drop-out fuse, which comprises a polyvinyl chloride (PVC) protective cover base body and a self-cleaning nano composite coating coated on the surface of the protective cover base body. The protective cover base body is made through an injection molding process and has a folding design to adapt to and protect the drop-out fuse and prevent short circuit caused by contact of small animals. In order to solve the problem of dirt in an outdoor environment, the application adopts an electrostatic spraying method to prepare a nano composite coating composed of TiO2 nanofibers and polyvinylidene fluoride (PVDF) on the surface of the base body. The coating has super-hydrophobic and self-cleaning functions, can significantly improve the surface insulation performance of the protective cover and reduce pollution flashover accidents. The protective cover of the application has excellent super-hydrophobic, self-cleaning and durable performances after product inspection and is suitable for complex outdoor environments, effectively guaranteeing the safe operation of the drop-out fuse.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power equipment protection and surface treatment, and particularly relates to a protective cover with self-cleaning function for a drop-out fuse and a preparation method thereof. BACKGROUND

[0002] In the field of power facility supporting equipment, especially for the protection of drop-out fuses, the existing technology mainly includes traditional protective cover designs. These designs mainly focus on physical isolation and protection to prevent small animals or external objects from contacting the fuse, thereby reducing the risk of short circuit and power failure. These protective covers are usually made of rubber, plastic, glass steel or other hard materials, and have certain mechanical strength and protection effect.

[0003] However, these traditional protective covers have deficiencies in dealing with dirt problems in complex outdoor environments. Since drop-out fuses work in complex outdoor environments, the surface of the protective cover of the existing technology is prone to accumulate dust, dirt and other impurities, which reduces the insulation performance and increases the risk of pollution flashover accidents. In addition, cleaning and maintenance is difficult. For a dirty protective cover, manual cleaning and maintenance is usually required, which not only increases the workload and cost, but also in some high-altitude or inaccessible situations, cleaning work may not be performed or there may be safety hazards. The protective cover of the existing technology mostly does not have a self-cleaning function and cannot automatically remove surface dirt, thereby failing to maintain good insulation performance and protection effect for a long time. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0006] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a protective cover with self-cleaning function for a drop-out fuse.

[0007] To solve the above technical problems, the present application provides the following technical solutions: a protective cover with self-cleaning function for a drop-out fuse, characterized in that: the protective cover for the drop-out fuse is composed of a polyvinyl chloride protective cover base body and a self-cleaning nano composite coating thereof;

[0008] The protective cover base body includes a main cavity, a fixed female buckle, a fixed male buckle and a crease area, wherein the crease area is used to fold and hold the lower end of the drop-out fuse of the one-time injection molded protective cover base body structure to form an insulation protection structure;

[0009] The nanocomposite coating is a nanocomposite film of TiO2 nanofiber and polyvinylidene fluoride.

[0010] Still another object of the present application is to provide a preparation method of a protective cover for a drop-out fuse with a self-cleaning function, which overcomes the deficiencies in the prior art.

[0011] The base structure of the protective cover is made by an injection molding process, and the surface of the base is ground.

[0012] A TiO2 nanofiber precursor solution is prepared.

[0013] The TiO2 nanofiber is prepared by electrospinning technology and calcination.

[0014] The TiO2 nanofiber and polyvinylidene fluoride powder are fully stirred in a solvent N,N-dimethylacetamide, and then a uniform coating with a consistent thickness is sprayed on the surface of the protective cover by electrostatic spraying, and the protective cover for a drop-out fuse with a self-cleaning function is obtained after solidification treatment.

[0015] As a preferred scheme of the preparation method, the base structure of the protective cover is made by an injection molding process, and the material of the base structure is high-performance polyvinyl chloride particles.

[0016] As a preferred scheme of the preparation method, the TiO2 nanofiber precursor solution includes a mixed solution of tetrabutyl titanate TBT, ethanol, and acetic acid, and polyvinylpyrrolidone PVP.

[0017] As a preferred scheme of the preparation method, the mixed solution of ethanol and acetic acid has a volume ratio of 4:1.

[0018] As a preferred scheme of the preparation method, the mass ratio of TBT to PVP is 5±1:1.

[0019] As a preferred scheme of the preparation method, the TiO2 nanofiber is prepared by electrospinning technology and calcination at a calcination temperature of 600-1000℃.

[0020] As a preferred scheme of the preparation method, the mass of the TiO2 nanofiber is 5%-30% of the total mass of the TiO2 nanofiber and the polyvinylidene fluoride powder.

[0021] As a preferred solution of the preparation method, the solidification treatment is carried out at 80-120℃ for 0.5-3h.

[0022] Another object of the present application is to provide an application of the protective cover for drop-out fuses in anti-fouling and anti-corrosion.

[0023] The present application has the following advantages:

[0024] (1) Unique self-cleaning function: The protective cover of the present application is coated with a self-cleaning nanocomposite coating composed of TiO2 nanofibers and polyvinylidene fluoride (PVDF) blend. This coating has excellent superhydrophobicity and self-cleaning function. This feature allows the protective cover surface to repel water and most liquids, while utilizing the photocatalytic effect of TiO2 nanofibers to decompose organic matter and dirt attached to the surface, thereby achieving self-cleaning. This function significantly reduces the need for manual cleaning, reduces maintenance costs, and prolongs the service life of the protective cover.

[0025] (2) Excellent insulation performance: By using polyvinyl chloride (PVC) as the protective cover base material and combining the application of self-cleaning nanocomposite coating, the insulation performance of the protective cover of the present application has been significantly improved. PVC material itself has good insulation performance, and the coating further enhances its anti-fouling and aging resistance, thereby reducing the risk of pollution flashover accidents and improving the safe operation level of drop-out fuses.

[0026] (3) Optimization of structural design: The protective cover of the present application adopts a unique main cavity, fixed female buckle, fixed male buckle and crease area design, which allows the protective cover to be easily folded and clamped to the lower end of the drop-out fuse. This structural design not only simplifies the installation process and reduces the construction difficulty, but also facilitates subsequent maintenance and repair work. At the same time, the sealing performance of the protective cover is effectively guaranteed, preventing interference from external factors such as small animals. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor. Among them:

[0028] Figure 1 The structural diagram of the protective cover for drop-out fuses provided by the present application.

[0029] Figure 2 The product photocatalytic performance test result graph prepared by the embodiment of the present application.

[0030] Figure 3 The figure shows the test results of the superhydrophobic properties of the product obtained in the embodiment of the present invention.

[0031] Figure 4 The figure shows the test results of the superhydrophobic properties of the product prepared in the comparative example of this invention. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0035] The raw materials used in this invention are sourced from: tetrabutyl titanate (analytical grade), Tianjin Kemeio Chemical Reagent Co., Ltd.; polyvinylpyrrolidone K90 (analytical grade), Tianjin Bodi Chemical Co., Ltd.; and anhydrous ethanol (analytical grade), Tianjin Fuyu Fine Chemical Co., Ltd.

[0036] The instruments / equipment used in the embodiments of the present invention are: X-ray diffractometer (Y-2000 type); ultraviolet-visible spectrophotometer (UV-1600PC type); infrared spectrometer (HHS11-1 type); microscope (LPK-M016B type); muffle furnace (NBD-M1200 type).

[0037] Example 1

[0038] like Figure 1 As shown, the first embodiment of the present invention provides a protective cover for a drop-out fuse with self-cleaning function, which is composed of a polyvinyl chloride (PVC) protective cover substrate and its self-cleaning nanocomposite coating.

[0039] The protective cover base structure includes a main cavity 1, a fixing female buckle 2, a fixing female buckle 3, and a crease area 4. The crease area 4 is used to fold the protective cover base structure, which is formed by injection molding, and lock it to the lower end of the drop-out fuse to form an insulating protective structure, so as to prevent small animals (rats, birds, etc.) from approaching and causing the drop-out fuse to short-circuit and cause a power outage accident.

[0040] The nanocomposite coating is a nanocomposite film of TiO2 nanofiber and polyvinylidene fluoride (PVDF) blended together, prepared by electrostatic spraying method.

[0041] Example 2

[0042] The embodiment provides a preparation method of a protective cover for a drop-out fuse, and comprises the following steps:

[0043] (1) Material and mold preparation

[0044] Raw material: high-performance polyvinyl chloride (PVC) particles are selected to ensure that the environmental protection and strength requirements are met.

[0045] Mold design: an injection mold is designed according to the specific size and shape of the protective cover to ensure the smoothness and precision of the surface.

[0046] (2) Injection molding, a medium-sized injection molding machine (Dongguan Lichang Machinery Co., Ltd. J220ADS) is used, and the parameters are set as follows:

[0047] Barrel temperature: 45±5℃ in the feeding area; gradually increased to 190±5℃ in the subsequent areas; 200±5℃ in the nozzle;

[0048] Melt temperature: 210±5℃, which helps the PVC resin to fully melt and maintain stable fluidity;

[0049] Barrel constant temperature: 120±5℃;

[0050] Mold temperature: 50±5℃ to promote uniform cooling and prevent deformation;

[0051] Injection pressure: 100±10Mpa, the injection pressure is adjusted according to the complexity of the mold and the fluidity of PVC;

[0052] Holding pressure: 30%-60% of the injection pressure;

[0053] Back pressure: 6±1MPa;

[0054] Shrinkage: 1.5%;

[0055] Holding time: to ensure that there are no shrinkage holes or bubbles in the product, the holding time is about 5-10 seconds;

[0056] Cooling time: according to the size of the mold and the material properties, the cooling time is usually 15-30 seconds.

[0057] (3) Surface sanding treatment

[0058] Grinding medium: Choose fine-grained sandpaper or grinding wheel for surface grinding treatment, ready for subsequent surface spraying treatment, increase adhesion;

[0059] Treatment intensity: Control the grinding intensity to ensure moderate surface roughness, which can enhance adhesion without damaging the substrate structure;

[0060] Cleaning: Thoroughly clean the surface after grinding to remove residues and ensure a clean surface free of impurities.

[0061] Example 3

[0062] This example is the surface treatment of the protective cover for the drop-out fuse prepared in Example 2, which includes the following steps:

[0063] (1) Preparation of precursor solution

[0064] Put 14g of a mixture of ethanol and acetic acid (4:1), 4g of tetrabutyl titanate, and 1g of polyvinylpyrrolidone (PVP) into a small beaker with a magnetic stirrer, stir for 24h and then stand for 2h, and the electrospinning precursor solution is obtained.

[0065] (2) Preparation of TiO2 nanofibers by electrospinning technology

[0066] Put the precursor solution into a plastic needle tube, then attach a 0.4mm needle to the other end to produce finer fibers, and fix the needle tube. Connect the positive electrode of the power supply to the metal needle and the negative electrode to the metal receiver. Adjust the distance between them to about 15cm, control the temperature at 20-25℃ and the humidity at 50-55%, and use a voltage of 15kV.

[0067] After electrospinning, carefully remove the white nanofibers from the receiver and place them in a crucible. After drying, place them in a muffle furnace and slowly raise the temperature to 800℃. After calcination, keep the temperature for 3h to obtain well-crystallized TiO2 nanofibers.

[0068] (3) Preparation of nanometer mixed solution

[0069] Raw materials: TiO2 nanofibers, polyvinylidene fluoride (PVDF) powder, and solvent N,N-dimethylacetamide (DMAc).

[0070] Proportion: Adjust the proportion of TiO2 nanofibers and PVDF, with TiO2 accounting for 20%.

[0071] Stirring: Stir the mixed solution thoroughly to ensure uniform dispersion of the nanofibers.

[0072] (4) Electrostatic spraying

[0073] Voltage: Set the spraying voltage between 20-30 kV, adjust according to the conductivity of the solution.

[0074] Spraying distance: Control the distance between the nozzle and the surface of the protective cover to be 20-30 cm.

[0075] Spraying speed: Move the spray gun uniformly to ensure consistent coating thickness and avoid accumulation.

[0076] Coating thickness: Control the spraying times and solution concentration to achieve the desired coating thickness, generally about 10-50 μm.

[0077] (5) Curing process

[0078] Temperature: Place the sprayed protective cover in an oven and cure at 80-120°C for 0.5-3 hours to ensure complete curing of the coating.

[0079] Cooling: Naturally cool to room temperature to avoid cracking of the coating due to rapid cooling.

[0080] Example 4

[0081] The difference between this example and Example 3 is that the calcination temperature in step (2) is replaced by 500°C, 600°C, and 1000°C, respectively, and the remaining steps are the same as Example 3.

[0082] Example 5

[0083] The difference between this example and Example 3 is that the mass of TiO2 nanofiber in step (3) is replaced by 50 mg, 75 mg, 100 mg, and 150 mg, respectively, and the remaining steps are the same as Example 3.

[0084] Example 6

[0085] This example is a test of the light degradation performance of the protective cover for the drop-out fuse prepared in Examples 3-5, which includes the following steps:

[0086] The nanofiber prepared under different conditions is sprayed on different protective covers by electrostatic spraying, then the same concentration of methyl orange solution is evenly applied on the surface of the protective cover, then it is placed in a position that can be directly exposed to sunlight, every 10 minutes, take back to check the decomposition of methyl orange, the results are shown in Figure 2 It can be seen that when the calcination temperature is 800°C and the mass of TiO2 nanofiber is 100 mg, the photocatalytic effect is the best.

[0087] Example 7

[0088] This example is a test of the super-hydrophobic performance of the protective cover for the drop-out fuse prepared in Example 3, which includes the following steps:

[0089] The coffee, methylene blue, nano-gold, nano-silver, hydrochloric acid solution (pH value = 1) and sodium hydroxide solution (pH value = 14) are respectively dropped on the protective cover, and the size of the contact angle of different solutions dropped on the protective cover is as shown in Figure 3 It can be seen that the contact angle is higher than 140° (highly hydrophobic surface), indicating that it has good high-liquid-repellent function, anti-fouling, strong acid and strong alkali corrosion protection effect, etc.

[0090] Comparative Example 1

[0091] The difference between the present comparative example and Example 3 is that the TiO2 nanofiber in step (3) is replaced by nano-CeO2, and the remaining steps are the same as Example 3. The treated product is tested for super-hydrophobic performance by the method of Example 7, and the results are as shown in Figure 4 It can be seen that the overall hydrophobic effect is inferior to that of the product treated by TiO2 nanofiber.

[0092] The present application combines the weather resistance and insulation performance of polyvinyl chloride materials, and the super-hydrophobicity and self-cleaning function of TiO2 nanocomposite materials, providing an efficient and reliable protection solution for outdoor working drop-out fuses. The high hydrophobic protective cover can make water droplets form nearly perfect spherical shape and easily roll off the surface, taking away dust and other dirt, thus having self-cleaning ability. The high hydrophobic surface is not easily wetted by pollutants in aqueous solution, so it can effectively resist the attachment of various pollutants and maintain the cleanliness of the surface. The high photocatalytic performance protective cover can catalytically degrade the organic pollutants attached to the surface under light (especially ultraviolet light) conditions, converting them into harmless substances such as carbon dioxide and water.

[0093] The high photocatalytic performance protective cover provided by the present application contains titanium dioxide, which not only degrades organic pollutants, but also has the function of absorbing ultraviolet rays, thus providing additional ultraviolet protection. The active oxygen species generated by the high photocatalytic performance material titanium dioxide in the photocatalytic process can destroy the cell structure of bacteria, thus having antibacterial effect. The high hydrophobic protective cover can maintain its hydrophobic performance even after long-term ultraviolet irradiation or multiple water washing, which means that they have good durability in practical application. The high photocatalytic performance protective cover can reduce the use of chemical cleaning agents, as they can self-clean through photocatalysis, which is more environmentally friendly. The protective cover combining high photocatalytic performance and high hydrophobicity not only provides physical protection, but also plays a role in environmental purification, self-cleaning, antibacterial and other aspects, realizing the diversification of the function of the protective cover.

[0094] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the present application, which should be covered in the scope of the present application.

Claims

1. A protective cover for a drop-out fuse having a self-cleaning function, characterized by: The protective cover for the drop-out fuse is composed of a polyvinyl chloride protective cover base body and a self-cleaning nano composite coating thereof. The protective cover base body comprises a main cavity (1), a fixed female buckle (2), a fixed male buckle (3), and a crease area (4), wherein the crease area (4) is used to fold and clamp the protective cover base body structure of one-time injection molding to the lower end of the drop-out fuse, forming an insulation protection structure. The nano composite coating is a nano composite film composed of TiO2 nanofiber and polyvinylidene fluoride. The preparation method of the protective cover for the drop-out fuse with self-cleaning function comprises, The base body structure of the protective cover is made by an injection molding process, and the surface of the base body is ground. A TiO2 nanofiber precursor solution is prepared. TiO2 nanofiber is prepared by electrospinning technology and calcination. TiO2 nanofiber and polyvinylidene fluoride powder are fully stirred in a solvent N,N-dimethylacetamide, and then a uniform coating with consistent thickness is sprayed on the surface of the protective cover by electrostatic spraying, and the protective cover for the drop-out fuse with self-cleaning function is obtained after solidification treatment.

2. The cover for a drop-out fuse as defined in claim 1, wherein: The base body structure of the protective cover is made by an injection molding process, wherein the material of the base body structure is high-performance polyvinyl chloride particles.

3. The cover for a drop-out fuse as defined in claim 1, wherein: The TiO2 nanofiber precursor solution is prepared, wherein the precursor solution comprises a mixed solution of tetrabutyl titanate TBT, ethanol and acetic acid, and polyvinylpyrrolidone PVP.

4. The cover for a drop-out fuse as defined in claim 3, wherein: The mixed solution of ethanol and acetic acid, wherein the volume ratio of ethanol to acetic acid is 4:

1.

5. The cover for a drop-out fuse as defined in claim 3, wherein: The mass ratio of TBT to PVP is 5±1:

1.

6. The cover for a drop-out fuse as defined in claim 1, wherein: TiO2 nanofiber is prepared by electrospinning technology and calcination, wherein the calcination temperature is 600-1000℃.

7. The cover for a drop-out fuse as defined in claim 1, wherein: The mass of the TiO2 nanofiber is 5%-30% of the total mass of the TiO2 nanofiber and the polyvinylidene fluoride powder.

8. The cover for a drop-out fuse as defined in claim 1, wherein: The solidification treatment condition is solidification at 80-120℃ for 0.5-3 h.

9. The protective cover for the drop-out fuse in the application of anti-fouling and anti-corrosion according to any one of claims 1-8.

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