Rat-proof and ant-proof medium-voltage cable and preparation method and application thereof

Abstract

The invention belongs to the technical field of cables, and particularly relates to a rat-proof and ant-proof medium-voltage cable and a preparation method and application thereof. The invention provides a rat-proof and ant-proof medium-voltage cable. The rat-proof and ant-proof medium-voltage cable comprises a conductive core layer, and a hygroscopic belting cushion layer (007), a plastic isolation sleeve layer (008) and a rat-proof and ant-proof coating (011) which sequentially wrap the surface of the conductive core layer, microcapsules are dispersed in the anti-rat and anti-termite coating (011), and capsule cores of the microcapsules are anti-rat and anti-termite repellent agents. According to the invention, rats and ants are avoided in a coating manner, the diameter of the cable is prevented from being increased, and bending and laying of the cable are facilitated; and meanwhile, the repellent is designed into a microcapsule form, so that slow release is realized, and the repellent effect is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a rat- and ant-proof medium-voltage cable and a preparation method and application thereof. Background Art

[0002] Anti-rat and ant cables are mainly used for power transmission in power systems. They can be used in transportation, petroleum, chemical industry, electricity, industry and mining, enterprises, construction and other fields. When cables are laid underground, the sheath will inevitably be gnawed by rats and ants, which will damage the cable sheath and cause short circuit or explosion of the cable. The anti-rat and ant bite function of traditional cables is mainly achieved through physical and chemical methods; the physical method mainly uses high-hardness cable sheath materials, such as high-hardness nylon, brass belts, steel belts, steel mesh, etc. to protect the cable; although the physical method of protecting cables from rat bites can effectively prevent rodents from damaging the cables, the high-hardness material increases the cable diameter and greatly increases the construction turning radius, limiting its laying ability in narrow spaces such as ships. The chemical method is to add repellents to the cable sheath material to prevent rats and termites from approaching the cable. The current process route for adding repellents to the cable sheath is to simultaneously add the repellents during the extrusion process of the cable sheath. This process has the following problems: First, the temperature of the cable sheath extrusion process is relatively high, which causes the repellent (capsaicin) to evaporate rapidly at high temperatures, causing environmental pollution and endangering the health of workers in the production workshop; second, the repellent (capsaicin) is loaded into the cable sheath by extrusion blending, which generally loses its effect after 6-12 months, which is much shorter than the service life of the cable (more than 10 years); third, if the cable is laid in a small space, the capsaicin mixed in the cable sheath will evaporate rapidly, resulting in a strong smell of capsaicin in the narrow space.

[0003] Providing a cable that has good resistance to rat and ant gnawing and good usability is a technical problem that needs to be solved urgently.

[0004] Invention

[0005] In view of this, the present invention provides a rat- and ant-proof medium-voltage cable and a preparation method and application thereof. The cable provided by the present invention has good rat- and ant-proof performance, and also has good bending performance and is easy to lay in a small space.

[0006] In order to solve the above technical problems, the present invention provides a rat-ant-proof medium-voltage cable, comprising a conductive core layer and a hygroscopic tape pad layer 007, a plastic isolation sleeve layer 008, and a rat-ant-proof coating 011 which are sequentially wrapped on the surface of the conductive core layer;

[0007] Microcapsules are dispersed in the rat-proof and ant-proof coating 011, and the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

[0008] Preferably, the rat and ant repellent comprises capsaicin; and the capsule wall of the microcapsule is epoxy resin.

[0009] Preferably, the method for preparing the microcapsules comprises the following steps:

[0010] The rat and ant repellent, epoxy resin and dichloromethane are mixed to obtain an oil phase;

[0011] dissolving sodium lauryl sulfate and polyether in water to obtain an aqueous phase;

[0012] The oil phase and the water phase are mixed and emulsified to obtain an emulsion;

[0013] The emulsion and the curing agent aqueous solution are mixed to carry out polymerization reaction to obtain the microcapsules.

[0014] Preferably, the thickness of the anti-rat and ant coating 011 is 10-50 μm.

[0015] Preferably, the conductive core layer includes three conductive units and a filling strip 006 filled in the gaps formed by the three conductive units;

[0016] The conductive unit is cylindrical, and any two of the three conductive units are tangent to each other.

[0017] Preferably, the conductive unit includes a conductor 001 and a conductor shielding layer 002 , an insulating layer 003 , an insulating shielding layer 004 , and a metal shielding layer 005 which are sequentially wrapped around the surface of the conductor 001 .

[0018] Preferably, an armor layer 009 and an outer sheath layer 010 are further provided between the plastic isolation sleeve layer 008 and the rat-ant-proof coating layer 011 , and the armor layer 009 is in direct contact with the plastic isolation sleeve layer 008 .

[0019] The present invention also provides a method for preparing the rat- and ant-proof medium-voltage cable described in the above technical solution, comprising the following steps:

[0020] A hygroscopic tape cushion layer 007, a plastic isolation sleeve layer 008, an armor layer 009 and an outer sheath layer 010 are sequentially arranged on the surface of the conductive core layer to obtain a primary rat-proof and ant-proof medium-voltage cable;

[0021] The primary rat-proof and ant-proof medium-voltage cable is coated with a coating containing microcapsules on its surface and then cured to obtain the rat-proof and ant-proof medium-voltage cable; the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

[0022] Preferably, the coating comprises a photocurable resin matrix, a reactive diluent, an adhesion promoter, a photoinitiator and microcapsules; the curing is ultraviolet curing, and the intensity of the light source used for the ultraviolet curing is 5700-5900 W / cm 2 .

[0023] The present invention also provides the use of the rat-ant-proof medium-voltage cable described in the above technical solution or the rat-ant-proof medium-voltage cable prepared by the preparation method described in the above technical solution in ships, petroleum, industry and mining, and construction.

[0024] The present invention provides a rat-ant proof medium voltage cable, comprising a conductive core layer and a hygroscopic tape cushion layer 007, a plastic isolation sleeve layer 008, and a rat-ant proof coating 011 which are sequentially wrapped on the surface of the conductive core layer; microcapsules are dispersed in the rat-ant proof coating 011, and the capsule core of the microcapsule is a rat-ant proof repellent. The present invention achieves rat-ant repellent in the form of a coating to avoid increasing the diameter of the cable to facilitate the bending and laying of the cable; at the same time, after the present invention coats the repellent capsaicin with microcapsules, on the one hand, the odor of the capsaicin is greatly reduced, which can improve the working environment of the production workshop. More importantly, the release rate of capsaicin coated in a solid form in microcapsules is greatly reduced, achieving sustained release to extend the repellent effect, which can fully meet the requirements of a rat-proof cable with a service life of more than ten years. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of the rat- and ant-proof medium-voltage cable prepared in Example 1;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the rat- and ant-proof medium-voltage cable prepared in Example 2;

[0027] Figure 1 and Figure 2 001 is the conductor, 002 is the conductor shielding layer, 003 is the insulation layer, 004 is the insulation shielding layer, 005 is the metal shielding layer, 006 is the filling strip, 007 is the hygroscopic tape padding layer, 008 is the plastic isolation sleeve layer, 009 is the armor layer, 010 is the outer sheath layer, and 011 is the rat and ant proof coating;

[0028] Figure 3 This is a scanning electron microscope image of the microcapsules prepared in Example 1;

[0029] Figure 4 It is a dotted line graph of the cumulative release rate of capsaicin in the rat and ant-proof coating in Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0030] The present invention provides a rat-ant-proof medium-voltage cable, comprising a conductive core layer and a hygroscopic tape cushion layer 007, a plastic isolation sleeve layer 008, and a rat-ant-proof coating layer 011 which are sequentially wrapped on the surface of the conductive core layer;

[0031] Microcapsules are dispersed in the rat-proof and ant-proof coating 011, and the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

[0032] Unless otherwise specified, all materials in the present invention are conventional commercially available products.

[0033] The rat- and ant-proof medium-voltage cable provided by the present invention includes a conductive core layer. In the present invention, the conductive core layer preferably includes three conductive units and a filling strip 006 filled in the gap formed by the three conductive units; the filling strip 006 is preferably a non-hygroscopic filling material. In the present invention, the conductive unit is preferably cylindrical, and any two of the three conductive units are tangent. In the present invention, the conductive unit preferably includes a conductor 001 and a conductor shielding layer 002, an insulating layer 003, an insulating shielding layer 004, and a metal shielding layer 005 wrapped in sequence on the surface of the conductor 001. In the present invention, the conductor 001 is preferably a copper conductor, and the copper conductor is preferably an oxygen-free copper conductor. The present invention has no special requirements for the size of the conductor, and it can be designed as needed. The present invention has no special requirements for the materials and thickness of the conductor shielding layer 002, the insulating layer 003, the insulating shielding layer 004 and the metal shielding layer 005, which can be defined in a conventional manner in the art.

[0034] The rat- and ant-proof medium voltage cable provided by the present invention comprises a hygroscopic tape pad layer 007 wrapped on the surface of the conductive core layer. In the present invention, the thickness of the hygroscopic tape pad layer 007 is preferably 0.25 to 0.35 mm, more preferably 0.3 mm.

[0035] The rat- and ant-proof medium-voltage cable provided by the present invention comprises a plastic isolation sleeve layer 008 wrapped on the surface of the hygroscopic tape cushion layer 007. In the present invention, the thickness of the plastic isolation sleeve layer 008 is preferably 2 to 3 mm, more preferably 2.5 to 2.6 mm.

[0036] The rat- and ant-proof medium-voltage cable provided by the present invention preferably further comprises an armor layer 009 wrapped on the surface of the plastic isolation sleeve layer 008. In the present invention, the thickness of the armor layer 009 is preferably 0.75 to 0.85 mm, more preferably 0.8 mm.

[0037] The rat- and ant-proof medium-voltage cable provided by the present invention preferably further comprises an outer sheath layer 010 wrapped on the surface of the armor layer 009. In the present invention, the thickness of the outer sheath layer 010 is preferably 3.5 to 4.5 mm, more preferably 3.9 to 4.0 mm.

[0038] The rat-ant-proof medium-voltage cable provided by the present invention comprises an outermost rat-ant-proof coating 011. In the present invention, the thickness of the rat-ant-proof coating 011 is preferably 10 to 50 μm, more preferably 40 to 40 μm.

[0039] In the present invention, microcapsules are dispersed in the rat-proof ant coating 011, and the capsule core of the microcapsule is a rat-proof ant repellent, and the rat-proof ant repellent preferably includes capsaicin. In the present invention, the capsaicin is preferably trans-8-methyl-N-vanillyl-6-nonenamide capsaicin. In the present invention, the capsule wall of the microcapsule is preferably epoxy resin.

[0040] In the present invention, the mass percentage of the microcapsules in the rat- and ant-proof coating 011 is preferably 1 to 10%, and more preferably 6 to 8%.

[0041] In the present invention, the method for preparing the microcapsules preferably comprises the following steps:

[0042] The rat and ant repellent, epoxy resin and dichloromethane are mixed to obtain an oil phase;

[0043] dissolving sodium lauryl sulfate and polyether in water to obtain an aqueous phase;

[0044] The oil phase and the water phase are mixed and emulsified to obtain an emulsion;

[0045] The emulsion and the curing agent aqueous solution are mixed to carry out polymerization reaction to obtain the microcapsules.

[0046] The present invention mixes a rat-proof and ant-proof repellent, an epoxy resin and dichloromethane to obtain an oil phase. In the present invention, the epoxy resin is preferably epoxy resin E44-6101. In the present invention, the mass ratio of the rat-proof and ant-proof repellent and the epoxy resin is preferably 1 to 4:1, more preferably 2 to 3:1. The present invention has no special requirements for the amount of dichloromethane (DCM), and the conventional amount in the art can be used. In the present invention, the mixing is preferably carried out under ultrasonic conditions. The present invention has no special requirements for the ultrasound, as long as it can be mixed evenly.

[0047] The present invention dissolves sodium dodecyl sulfate and polyether in water to obtain an aqueous phase. In the present invention, the mass concentration of sodium dodecyl sulfate (SDS) in the aqueous phase is preferably 0.8-1.2%, more preferably 1%. In the present invention, the polyether is preferably polyether F127, and the mass concentration of the polyether in the aqueous phase is preferably 1.3-1.7%, more preferably 1.5%.

[0048] After obtaining the oil phase and the aqueous phase, the present invention mixes the oil phase and the aqueous phase for emulsification to obtain an emulsion. In the present invention, the mass ratio of the oil phase to the aqueous phase is preferably 1:1-9, more preferably 1:1-5. In the present invention, the emulsification is preferably carried out in a homogenizer, and the homogenizer used in the embodiment of the present invention is T-18IKA. In the present invention, the rotation speed of the emulsification is preferably 7000-9000r / min, more preferably 8000r / min; the emulsification temperature is preferably 40-70°C, more preferably 50-60°C; the emulsification time is preferably 4-6min, more preferably 5min. In the present invention, the emulsion is preferably an oil-in-water emulsion (O / W).

[0049] After obtaining the emulsion, the present invention mixes the emulsion and the curing agent aqueous solution to carry out polymerization reaction to obtain the microcapsule. In the present invention, the curing agent in the curing agent aqueous solution is preferably a mixture of 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) and triethylenetetramine (TETA) or 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30). In the present invention, when the curing agent is 2,4,6-tris(dimethylaminomethyl)phenol and triethylenetetramine, the mass ratio of 2,4,6-tris(dimethylaminomethyl)phenol and triethylenetetramine is preferably 9 to 11:1, more preferably 10:1. In the present invention, the mass ratio of the epoxy resin and the curing agent is preferably 4 to 8:1, more preferably 5 to 7:1.

[0050] In the present invention, the polymerization reaction temperature is preferably 50 to 75° C., more preferably 60 to 70° C.; the polymerization reaction time is preferably 4 to 8 hours, more preferably 5 to 6 hours.

[0051] In the present invention, after the polymerization reaction, the polymerization reaction preferably further comprises: cooling the system after the polymerization reaction in an ice-water bath and then centrifuging; washing the solid obtained by the centrifugation and then drying to obtain the microcapsules. In the present invention, the cooling time is preferably 10 to 14 hours, more preferably 12 hours. The present invention has no special limitation on the centrifugation, as long as solid-liquid separation can be achieved. In the present invention, the water used for washing is preferably deionized water; the number of washings is preferably 2 to 4 times, more preferably 3 times. The present invention has no special limitation on the drying, as long as the solvent can be removed.

[0052] In the present invention, the capsule wall thickness of the microcapsule is preferably above 10 μm, more preferably 20 to 50 μm. The present invention limits the capsule wall thickness of the microcapsule to slow down the release rate of the repellent as the capsule core and improve the stability of the rat and ant repellent performance of the rat and ant proof medium voltage cable.

[0053] The present invention adopts a coating method to solve the problem of cable anti-rat and ant protection, thereby achieving lightweight, reducing costs, being more environmentally friendly, and having more durable and effective performance.

[0054] The present invention also provides a method for preparing the rat- and ant-proof medium-voltage cable described in the above technical solution, comprising the following steps:

[0055] A hygroscopic tape cushion layer 007, a plastic isolation sleeve layer 008, an armor layer 009 and an outer sheath layer 010 are sequentially arranged on the surface of the conductive core layer to obtain a primary rat-proof and ant-proof medium-voltage cable;

[0056] The primary rat-proof and ant-proof medium-voltage cable is coated with a coating containing microcapsules on its surface and then cured to obtain the rat-proof and ant-proof medium-voltage cable; the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

[0057] The present invention sequentially arranges a hygroscopic tape cushion layer 007, a plastic isolation sleeve layer 008, an armor layer 009 and an outer sheath layer 010 on the surface of the conductive core layer to obtain a primary rat-proof ant-proof medium voltage cable. The present invention has no special requirements on the manner of arranging the hygroscopic tape cushion layer 007, the plastic isolation sleeve layer 008, the armor layer 009 and the outer sheath layer 010, and a conventional manner in the art can be adopted.

[0058] After obtaining the primary rat-proof ant-proof medium-voltage cable, the present invention applies a coating containing microcapsules on the surface of the primary rat-proof ant-proof medium-voltage cable and then cures it to obtain the rat-proof ant-proof medium-voltage cable. In the present invention, the coating preferably includes a photocurable resin matrix, a reactive diluent, an adhesion promoter, a photoinitiator and microcapsules. In the present invention, the photocurable resin is preferably a polyether polyurethane oligomer resin or a polyester polyurethane oligomer resin, and the functionality of the curable resin is preferably 2 to 4, more preferably 3. In the present invention, the polyester polyurethane oligomer resin is preferably polyurethane acrylate (RY2203).

[0059] In the present invention, the reactive diluent preferably includes isobornyl acrylate (IBOA) and / or isobornyl methacrylate (IBOMA), more preferably isobornyl acrylate or isobornyl methacrylate. In the present invention, the functionality of the reactive diluent is preferably greater than or equal to 2. The present invention has no special restrictions on the mass ratio of the photocurable resin and the reactive diluent, and the conventional ratio in the art can be used.

[0060] In the present invention, the adhesion promoter preferably includes isobornyl acrylate (IBOA) and / or chlorinated polypropylene (CPP), more preferably isobornyl acrylate or chlorinated polypropylene. In the present invention, the chlorinated polypropylene is preferably CPP-526P. The present invention has no special restrictions on the mass ratio of the photocurable resin and the adhesion promoter, and the conventional ratio in the art can be used.

[0061] In the present invention, the photoinitiator is preferably 2-hydroxy-2-methyl-1-phenylpropanone (1173). The present invention has no special restrictions on the mass ratio of the photocurable resin and the photoinitiator, and the conventional ratio in the art can be used.

[0062] The present invention preferably mixes a photocurable resin matrix, a reactive diluent, an adhesion promoter, a photoinitiator and microcapsules and then ball mills them to obtain a coating. In the present invention, the rotation speed of the ball mill is preferably 2500-2700 r / min, more preferably 2600 r / min; the time of the ball milling is preferably 2-4 min, more preferably 3 min. In the present invention, the content of microcapsules in the coating is preferably 1-10%.

[0063] In the present invention, the coating preferably includes spraying.

[0064] In the present invention, the curing is preferably ultraviolet curing, and the intensity of the light source used for the ultraviolet curing is preferably 5700-5900 W / cm 2 , more preferably 5800mW / cm 2 .

[0065] The present invention applies the coating on the surface of the outer sheath layer 010 and then cross-links and solidifies it through UV light curing to form the rat-proof and ant-proof coating 011.

[0066] The present invention utilizes an emulsion template method and interfacial polymerization technology to encapsulate a rat-ant repellent as a solid component into a microcapsule, and utilizes the microcapsules coated with the repellent as a cable sheath coating component, which can significantly reduce the release rate of the repellent at a coating thickness as low as 50 μm, thereby achieving a lightweight, rat-ant-proof, high-performance cable sheath. The preparation process of the rat-ant-proof medium-voltage cable provided by the present invention is simple and suitable for large-scale industrial production. Based on microcapsule technology, a layer of elastic coating with a long-lasting repellent effect can be constructed on the outer layer of the cable sheath, without the need to modify the existing process of cable production and without increasing the turning radius of the cable. After the repellent capsaicin is coated with microcapsules, on the one hand, the odor of capsaicin is greatly reduced, and no pollution is caused to the environment, and the working environment of the production workshop can be improved, and no irritating odor is released, providing protection for the health of production employees.

[0067] The present invention also provides the use of the rat-ant-proof medium-voltage cable described in the above technical solution or the rat-ant-proof medium-voltage cable prepared by the preparation method described in the above technical solution in ships, petroleum, industry and mining, and construction.

[0068] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0069] Example 1

[0070] 3 g of capsaicin, 3 g of epoxy resin E44-6101 and 100 mL of dichloromethane were mixed under ultrasonication to obtain an oil phase;

[0071] Dissolve sodium dodecyl sulfate and polyether F127 in water to obtain an aqueous phase; the mass concentration of sodium dodecyl sulfate (SDS) in the aqueous phase is 1%, and the mass concentration of polyether F127 is 1.5%;

[0072] The oil phase and the water phase were mixed in a mass ratio of 1:5 and emulsified in a T-18IKA homogenizer at a speed of 8000 r / min for 5 min to obtain an oil-in-water emulsion (O / W);

[0073] The latex and the curing agent (a mixture of 2,4,6-tris(dimethylaminomethyl)phenol and triethylenetetramine in a mass ratio of 10:1) aqueous solution were mixed and subjected to polymerization reaction at 70°C for 6 hours; the system after the polymerization reaction was placed in an ice water bath for cooling for 12 hours and then centrifuged; the solid obtained by centrifugation was washed 3 times with deionized water and then dried to obtain microcapsules with a capsule wall of 10 μm; the mass ratio of epoxy resin to curing agent in the polymerization reaction system was 6:1;

[0074] Polyurethane acrylate (RY2203, photocurable resin) with a functionality of 3, isobornyl acrylate (IBOA, reactive diluent) with a functionality of 3, isobornyl acrylate (IBOA, adhesion promoter), 2-hydroxy-2-methyl-1-phenylpropanone (1173, photoinitiator) and microcapsules were mixed and ball-milled at a speed of 2600 r / min for 3 minutes to obtain a coating; the content of microcapsules in the coating was 10%;

[0075] A conductor shielding layer 002, an insulating layer 003, an insulating shielding layer 004, and a metal shielding layer 005 are sequentially arranged on the surface of an oxygen-free copper conductor to form a conductive unit; three groups of conductive units are closely contacted, and a non-hygroscopic filling material (filling strip 006) is filled in the formed gap to form a conductive core layer; a hygroscopic tape cushion layer 007 with a thickness of 0.3 mm, a plastic isolation sleeve layer 008 with a thickness of 2.6 mm, an armor layer 009 (metal tape armor) with a thickness of 0.8 mm, and an outer sheath layer 010 with a thickness of 3.9 mm are sequentially arranged on the surface of the conductive core layer to obtain a primary rat-proof medium-voltage cable;

[0076] After spraying 50μm thick paint on the surface of the primary anti-rat and ant type medium voltage cable, the light intensity is 5800mW / cm 2 The ultraviolet light is cured at a speed of 5.6m / min to form the anti-rat and ant coating 011, and the light source dose is 3700mJ / cm 2 , and obtain rat- and ant-proof medium-voltage cable.

[0077] Example 2

[0078] A rat-ant-proof medium-voltage cable is prepared according to the method of Example 1, except that the armor layer 009 and the outer sheath layer 010 are omitted and the rat-ant-proof coating 011 is directly sprayed on the surface of the plastic isolation sheath layer 008 .

[0079] Comparative Example 1

[0080] A rat- and ant-proof medium-voltage cable was prepared according to the method of Example 1, except that microcapsules were not prepared, and the microcapsules were directly replaced with capsaicin when preparing the coating. The mass percentage of capsaicin in the rat- and ant-proof coating 011 was 5%.

[0081] Figure 1 This is a schematic diagram of the cross-sectional structure of the rat- and ant-proof medium-voltage cable prepared in Example 1. Figure 2 This is a schematic diagram of the cross-sectional structure of the rat- and ant-proof medium-voltage cable prepared in Example 2, wherein 001 is a conductor, 002 is a conductor shielding layer, 003 is an insulating layer, 004 is an insulating shielding layer, 005 is a metal shielding layer, 006 is a filling strip, 007 is a hygroscopic tape pad layer, 008 is a plastic isolation sleeve layer, 009 is an armor layer, 010 is an outer sheath layer, and 011 is a rat- and ant-proof coating.

[0082] Figure 3 The scanning electron microscope image of the microcapsules prepared in Example 1 is shown in FIG. Figure 3 It can be seen that the microcapsules prepared in the example are spherical, and their surfaces are smooth and neat.

[0083] The release rate of capsaicin in the rat-proof ant coating was detected by ultraviolet spectrophotometer (UV-1900i ultraviolet Visible spectrophotometer: Shimadzu Co., Japan), specifically as follows: 1. Toluene was used as the release medium. First, capsaicin was added to a toluene solvent to prepare standard solutions of 40 μg / mL, 60 μg / mL, 80 μg / mL, 100 μg / mL, and 120 μg / mL, and the absorption peak value of the standard solution at 286 nm was tested to obtain the capsaicin toluene solution and the standard curve of the absorption peak. 2. The rat-proof ant coating in Comparative Example 1 and Example 1 was divided into 20 mL glass bottles, 20 mL of toluene solvent was added, and samples were taken at 20°C at the same prescribed release time, and the sampled samples were immediately tested for the absorption peak at 286 nm. The concentration of capsaicin in the toluene solvent at this time was obtained according to the standard curve, thereby calculating the release rate of the sample, and the results are listed in Table 1.

[0084] Table 1 Cumulative release rate of capsaicin in the rat-ant-proof coating in Example 1 and Comparative Example 1

[0085]

[0086] According to Table 1, a dotted line graph of the cumulative release rate of capsaicin in the rat and ant-proof coating in Example 1 and Comparative Example 1 is drawn, as shown in FIG. Figure 4 Combining Table 1 and Figure 4 It can be seen that the release rate of capsaicin encapsulated in the form of microcapsules is slow, which can prolong the repellent effect and fully meet the requirements of a service life of more than ten years for rat-proof cables.

[0087] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A rat and ant proof medium voltage cable, characterized in that: It comprises a conductive core layer and a hygroscopic tape pad layer (007), a plastic isolation sleeve layer (008), and a rat and ant proof coating (011) which are sequentially wrapped on the surface of the conductive core layer; Microcapsules are dispersed in the rat-proof and ant-proof coating (011), and the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

2. The rat- and ant-proof medium-voltage cable according to claim 1, characterized in that: The rat and ant repellent comprises capsaicin; and the capsule wall of the microcapsule is epoxy resin.

3. The rat- and ant-proof medium-voltage cable according to claim 2, characterized in that: The preparation method of the microcapsules comprises the following steps: The rat and ant repellent, epoxy resin and dichloromethane are mixed to obtain an oil phase; dissolving sodium lauryl sulfate and polyether in water to obtain an aqueous phase; The oil phase and the water phase are mixed and emulsified to obtain an emulsion; The emulsion and the curing agent aqueous solution are mixed to carry out polymerization reaction to obtain the microcapsules.

4. The rat- and ant-proof medium voltage cable according to any one of claims 1 to 3, characterized in that: The thickness of the rat and ant-proof coating (011) is 10 to 50 μm.

5. The rat- and ant-proof medium-voltage cable according to claim 1, characterized in that: The conductive core layer comprises three conductive units and filling strips (006) filled in gaps formed by the three conductive units; The conductive unit is cylindrical, and any two of the three conductive units are tangent to each other.

6. The rat- and ant-proof medium-voltage cable according to claim 5, characterized in that: The conductive unit comprises a conductor (001) and a conductor shielding layer (002), an insulating layer (003), an insulating shielding layer (004), and a metal shielding layer (005) which are sequentially wrapped around the surface of the conductor (001).

7. The rat- and ant-proof medium-voltage cable according to claim 1, characterized in that: An armor layer (009) and an outer sheath layer (010) are also provided between the plastic isolation sleeve layer (008) and the rat-ant-proof coating layer (011), and the armor layer (009) is in direct contact with the plastic isolation sleeve layer (008).

8. A method for preparing the rat- and ant-proof medium-voltage cable according to any one of claims 1 to 7, comprising the following steps: A hygroscopic tape cushion layer (007), a plastic isolation sleeve layer (008), an armor layer (009) and an outer sheath layer (010) are sequentially arranged on the surface of the conductive core layer to obtain a primary rat-proof and ant-proof medium-voltage cable; The primary rat-proof and ant-proof medium-voltage cable is coated with a coating containing microcapsules on its surface and then cured to obtain the rat-proof and ant-proof medium-voltage cable; the capsule core of the microcapsule is a rat-proof and ant-proof repellent.

9. The preparation method according to claim 8, characterized in that: The coating comprises a photocurable resin matrix, a reactive diluent, an adhesion promoter, a photoinitiator and microcapsules; the curing is ultraviolet curing, and the intensity of the light source used for the ultraviolet curing is 5700-5900 W / cm 2 .

10. Use of the rat- and ant-proof medium-voltage cable according to any one of claims 1 to 7 or the rat- and ant-proof medium-voltage cable prepared by the preparation method according to any one of claims 8 to 9 in ships, petroleum, industry, mining and construction.

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