A mildew-resistant, waterproof and rat-proof PVC cable and a preparation method thereof

Abstract

The present invention discloses a mildew-resistant, waterproof and rat-proof PVC cable and a preparation method thereof, and belongs to the technical field of PVC cables. The PVC cable comprises a core layer, the core layers are arranged in a circle and provided with four groups, a ground layer is provided in the middle of the core layer, a filling layer is provided outside the core layer and the core layer, a shielding layer is provided outside the filling layer, an inner protective layer is provided outside the shielding layer, an armor layer is provided outside the inner protective layer, an outer protective layer is provided outside the armor layer, the core layer comprises a core conductor and a core insulation layer provided outside the core conductor, and the ground layer comprises a ground conductor and a ground insulation layer provided outside the ground conductor. The cable prepared by the present invention has flame retardant, thermal stability, mildew resistance, water resistance and oil resistance. The rat gnawing experiment shows that the cable prepared by the present invention also has the function of rat-proofing, and still has the function of rat-proofing after the aging experiment, thereby ensuring a continuous rat-proofing effect.

Description

Technical Field

[0001] The invention belongs to the technical field of PVC cables, and in particular relates to a mildew-resistant, waterproof and rat-proof PVC cable and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC) is widely used as an electrical insulation material or sheath material in the electrical field, especially in cable manufacturing, because of its good electrical insulation, certain strength and toughness, and good tolerance to chemical substances. It effectively protects the conductor and insulation layer inside the cable from external mechanical damage and reduces cable failures caused by chemical corrosion. However, whether in the wild or in human activity areas, rats cause extremely serious damage to cable sheaths and insulation layers. It is not uncommon for field mice to gnaw on cables in the wild, causing failures, and it is also common for wires in urban buildings to be damaged by rats. The performance of the rat-proof cables currently circulating on the market still has a lot of room for improvement.

[0003] Researchers have conducted in-depth research on the effects of natural capsaicin on mouse behavior and conducted research on the capsaicin receptors of mice. The results show that natural capsaicin can stimulate mice. Given that natural capsaicin is widely available and environmentally friendly, adding it to cable sheath materials as a rodent repellent to prepare rodent-proof cable sheath materials has become a feasible idea. However, when the cable is processed, capsaicin will seep and volatilize as the temperature rises. And during the installation and use of the cable, the pungent smell of natural capsaicin that migrates to the surface of the sheath will cause physical harm to the installers and pollute the environment. In addition, the long-term volatilization of natural capsaicin makes it difficult to achieve continuous rodent prevention, which in turn affects the service life and performance of the cable. Although studies have shown that adding microencapsulated rodent repellents to cable sheath materials can extend the effective period of rodent prevention and increase the life of the cable, many studies in recent years have found that capsule coating not only affects the effect of rodent repellents, but also has an adverse effect on the performance and life of cable cabling, insulation and sheathing. Therefore, the application of rodent-proof materials prepared by this method has gradually decreased, and new methods for preparing and using cable rodent repellents are being explored and tried. At the same time, studies have shown that using natural capsaicin alone as a rodent repellent will weaken the flame retardant, waterproof, and mildew-proof properties of the PVC substrate. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention prepares a specific modified rat-proof material that works synergistically with other functional components to enable the cable to have excellent comprehensive performance in complex environments, thereby solving the defects and shortcomings of traditional cables in terms of rat-proofing, flame retardancy, mildew resistance, waterproofness, oil resistance and other aspects of performance.

[0005] In order to achieve the above-mentioned purpose, the following technical scheme is adopted: on the one hand, the present invention provides a mildew-resistant, waterproof and rat-proof PVC cable, including a core layer, the core layers are arranged in a circle and provided with four groups, a ground wire layer is provided in the middle of the core layer, a filling layer is provided on the core layer and the outside of the core layer, a shielding layer is provided on the outside of the filling layer, an inner protective layer is provided on the outside of the shielding layer, an armor layer is provided on the outside of the inner protective layer, and an outer protective layer is provided on the outside of the armor layer, the core layer includes a core conductor and a core insulation layer provided outside the core conductor, and the ground wire layer includes a ground wire conductor and a ground wire insulation layer provided outside the ground wire conductor.

[0006] Furthermore, the outer protective layer comprises the following components in parts by weight: 100-150 parts of PVC resin, 10-30 parts of EVA resin, 20-40 parts of plasticizer, 5-10 parts of calcium zinc stabilizer, 3-5 parts of modified rodent-proof material, 0.5-2 parts of antioxidant, 0.5-1 parts of lubricant, and 0.5-2 parts of methacrylate.

[0007] Furthermore, the modified rodent-proof material is prepared by the following steps:

[0008] S1. Add 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin to toluene, add benzoin dimethyl ether as a catalyst, irradiate under ultraviolet light for 10-20 minutes, cause a thiol-vinyl click reaction, and then heat to 85-100° C. and react for 1-3 hours. After the reaction is completed, remove toluene under reduced pressure to obtain a CAP / BIM intermediate;

[0009] S2, the CAP / BIM intermediate is configured into a first solution with a mass concentration of 5%-10%, zinc nitrate is configured into a second solution with a mass concentration of 5%-15%, and triethylamine is configured into a third solution with a mass concentration of 1%-3%, the second solution and the third solution are added to the first solution under stirring, stirred at 80-120° C. for 12-24 hours, and then centrifuged to obtain a precipitate, washed three times with DMF and anhydrous acetone respectively, and dried to obtain a CAP / BIM / Zn framework material;

[0010] S3. Add magnesium aluminum hydrotalcite to ethanol, evenly disperse it, add the CAP / BIM / Zn framework material, heat to 70-120° C., react for 1-4 hours, use a cell crusher to sonicate for 10-30 minutes, remove the solvent under reduced pressure, and obtain the modified rodent-proof material after drying.

[0011] Furthermore, in step S1, the mass ratio of 1-(1-adamantyl)-1H-benzimidazole-2-thiol, natural capsaicin, benzoin dimethyl ether and toluene is 2-5:1-3:0.05-0.2:80-100.

[0012] Furthermore, in step S2, the mass ratio of the first solution, the second solution and the third solution is 10-20:5-12:1-3.

[0013] Furthermore, in step S3, the mass ratio of magnesium aluminum hydrotalcite, ethanol and CAP / BIM / Zn framework material is 6-15:50-80:1-3.

[0014] Furthermore, the plasticizer is a combination of one of dibutyl phthalate, dioctyl phthalate, trioctyl trimellitate and triisodecyl trimellitate and epoxidized soybean oil.

[0015] Preferably, the plasticizer is a combination of triisodecyl trimellitate and epoxidized soybean oil.

[0016] Furthermore, the antioxidant is a combination of one or more of antioxidant 1010 , antioxidant 1076 , antioxidant 1024 and antioxidant 1035 .

[0017] Preferably, the antioxidant is a combination of antioxidant 1010 and antioxidant 1035.

[0018] Furthermore, the lubricant is a combination of one or more of calcium stearate, stearic acid, oxidized polyethylene wax and microcrystalline wax.

[0019] Preferably, the lubricant is a combination of calcium stearate, oxidized polyethylene wax and microcrystalline wax.

[0020] Furthermore, the core conductor is a twisted and compressed copper wire, the ground wire conductor is a copper-plated steel wire, and the core insulation layer and the ground wire insulation layer are polyethylene insulation materials.

[0021] Furthermore, the filling layer is a polyester fiber tape, the shielding layer is a galvanized copper tape, the inner protective layer is a silicone rubber, and the armor layer is an aluminum tape.

[0022] On the other hand, the present invention also provides a method for preparing a mildew-resistant, waterproof and rat-proof PVC cable, comprising the following steps: twisting and pressing copper wires to obtain a core conductor, then wrapping polyethylene insulation material around the outside of the core conductor and the ground conductor to form a core insulation layer and a ground insulation layer, filling the outside of the core insulation layer and the ground insulation layer with a polyester fiber tape to form a filling layer, arranging a galvanized copper tape outside the filling layer to form a shielding layer, extruding silicone rubber outside the shielding layer to form an inner sheath, weaving an aluminum tape outside the inner sheath to form an armor layer, melt-blending the components of the outer sheath at 100°C through a double-roll mill, and then extruding them outside the armor layer at 20MPa and 110°C to form an outer sheath, thereby obtaining the PVC cable.

[0023] The beneficial effects of the present invention are:

[0024] (1) The cable prepared by the present invention has the characteristics of flame retardancy, thermal stability, mildew resistance, water resistance and oil resistance. The rat gnawing experiment shows that the cable prepared by the present invention also has the function of preventing rats from biting, and still has the function of preventing rats after the aging experiment, thus ensuring the continuous anti-rat effect;

[0025] (2) In the preparation of the modified rodent-proof material of the present invention, 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin are first combined through a thiol-vinyl click reaction to form a CAP / BIM intermediate, which is then further reacted with zinc nitrate to form a CAP / BIM / Zn skeleton material. The metal skeleton material has good thermal conductivity and can quickly conduct the heat generated inside the cable to reduce the risk of fire. Finally, the skeleton material is composited with magnesium-aluminum hydrotalcite. The composite structure can effectively fix natural capsaicin and reduce its exudation and volatilization during processing and use. During the use of the cable, natural capsaicin can be continuously and slowly released to stimulate mice.

[0026] (3) The nitrogen and phosphorus elements in the modified rodent-proof material prepared by the present invention have a synergistic effect during the combustion process. The nitrogen-containing group can decompose to produce inert gases such as nitrogen, dilute the oxygen concentration in the combustion area, and inhibit the combustion reaction. At the same time, the phosphorus-containing group can promote the formation of a carbon layer on the polymer surface, isolate the contact between oxygen and the internal polymer, prevent the spread of combustion, and significantly improve the flame retardant properties of the cable. The magnesium-aluminum hydrotalcite has a unique layered double hydroxide structure. When heated, it will decompose and release bound water, absorb a large amount of heat, reduce the ambient temperature, delay the thermal decomposition of the polymer, further prevent heat transfer and oxygen diffusion, and enhance the flame retardant effect.

[0027] (4) The hydrophilic groups of the CAP / BIM / Zn skeleton material interact electrostatically with the cations of the magnesium aluminum hydrotalcite, thereby adsorbing the skeleton material on the magnesium aluminum hydrotalcite. The adamantyl group in 1-(1-adamantyl)-1H-benzimidazole-2-thiol and the alkyl chain contained in natural capsaicin enhance the binding of the modified rodent-proof material to the PVC matrix. The rigidity of the adamantyl group and the non-polarity of the alkyl chain improve the hydrophobicity of the PVC material, and at the same time improve the oil resistance while enhancing the hydrophobicity, thereby preventing moisture and organic nutrients from staying on the surface of the cable outer sheath for a long time, reducing the possibility of mold growth on the cable surface, and improving the mildew resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a mildew-resistant, waterproof and rat-proof PVC cable of the present invention;

[0029] Figure 2The waterproof performance test results of the cables prepared in various embodiments and comparative examples of the present invention are shown;

[0030] Figure 3 The flame retardant performance test results of the cables prepared in various embodiments and comparative examples of the present invention;

[0031] Figure 4 The test results of the rat-proof performance of the cables prepared in various embodiments and comparative examples of the present invention are as follows;

[0032] Figure 5 The test results of the mildew resistance of the cables prepared in the embodiments and comparative examples of the present invention are shown.

[0033] Legend: 1. Wire core layer; 11. Wire core conductor; 12. Wire core insulation layer; 2. Ground wire layer; 21. Ground wire conductor; 22. Ground wire insulation layer; 3. Filling layer; 4. Shielding layer; 5. Inner sheath; 6. Armor layer; 7. Outer sheath.

[0034] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0037] The experimental methods in the following examples are conventional methods unless otherwise specified, and the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified. Example 1

[0038] According to the attached Figure 1A mildew-resistant, waterproof and rat-proof PVC cable comprises a core layer 1, wherein the core layer 1 is arranged in a circle and provided with four groups, a ground layer 2 is provided in the middle of the core layer 1, a filling layer 3 is provided on the core layer 1 and the outside of the core layer 1, a shielding layer 4 is provided on the outside of the filling layer 3, an inner protective layer 5 is provided on the outside of the shielding layer 4, an armor layer 6 is provided on the outside of the inner protective layer 5, and an outer protective layer 7 is provided on the outside of the armor layer 6, the core layer 1 comprises a core conductor 11 and a core insulating layer 12 arranged outside the core conductor 11, and the ground layer 2 comprises a ground conductor 21 and a ground insulating layer 22 arranged outside the ground conductor 21.

[0039] The outer protective layer comprises the following components in parts by weight: 100 parts of PVC resin, 10 parts of EVA resin, 20 parts of plasticizer, 5 parts of calcium zinc stabilizer, 3 parts of modified rodent-proof material, 0.5 parts of antioxidant, 0.5 parts of lubricant and 0.5 parts of methacrylate.

[0040] The modified rodent-proof material is prepared by the following steps:

[0041] S1. 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin are added to toluene, and benzoin dimethyl ether is added as a catalyst. The mixture is irradiated under ultraviolet light for 10 minutes to cause a thiol-vinyl click reaction. The mixture is then heated to 85° C. and reacted for 1 hour. After the reaction is completed, the toluene is removed under reduced pressure to obtain a CAP / BIM intermediate.

[0042] S2, the CAP / BIM intermediate is configured into a first solution with a mass concentration of 5%, zinc nitrate is configured into a second solution with a mass concentration of 5%, and triethylamine is configured into a third solution with a mass concentration of 1%, the second solution and the third solution are added to the first solution under stirring, stirred at 80° C. for 12 hours, and then centrifuged to obtain a precipitate, washed three times with DMF and anhydrous acetone respectively, and dried to obtain a CAP / BIM / Zn framework material;

[0043] S3. Add magnesium aluminum hydrotalcite to ethanol, evenly disperse it, add the CAP / BIM / Zn framework material, heat to 70°C, react for 1 hour, use a cell crusher to sonicate for 10 minutes, remove the solvent under reduced pressure, and obtain the modified rodent-proof material after drying.

[0044] In the step S1, the mass ratio of 1-(1-adamantyl)-1H-benzimidazole-2-thiol, natural capsaicin, dimethyl benzoate and toluene is 2:1:0.05:80; in the step S2, the mass ratio of the first solution, the second solution and the third solution is 10:5:1; in the step S3, the mass ratio of magnesium aluminum hydrotalcite, ethanol and CAP / BIM / Zn skeleton material is 6:50:1; the plasticizer is a combination of dibutyl phthalate and epoxidized soybean oil in a mass ratio of 2:1; the antioxidant is antioxidant 101; and the lubricant is calcium stearate.

[0045] The core conductor is a twisted and compressed copper wire, the ground wire conductor is a copper-plated steel wire, the core insulation layer and the ground wire insulation layer are polyethylene insulation materials; the filling layer is a polyester fiber tape, the shielding layer is a galvanized copper tape, the inner sheath is silicone rubber, and the armor layer is an aluminum tape. Example 2

[0046] A mildew-resistant, waterproof and rat-proof PVC cable, the structure of which is the same as that of embodiment 1.

[0047] The outer protective layer comprises the following components in parts by weight: 150 parts of PVC resin, 30 parts of EVA resin, 40 parts of plasticizer, 10 parts of calcium zinc stabilizer, 5 parts of modified rodent-proof material, 2 parts of antioxidant, 1 part of lubricant and 2 parts of methacrylate.

[0048] The modified rodent-proof material is prepared by the following steps:

[0049] S1. 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin are added to toluene, and benzoin dimethyl ether is added as a catalyst. The mixture is irradiated under ultraviolet light for 20 minutes to cause a thiol-vinyl click reaction. The mixture is then heated to 100° C. and reacted for 3 hours. After the reaction is completed, the toluene is removed under reduced pressure to obtain a CAP / BIM intermediate.

[0050] S2, the CAP / BIM intermediate is configured into a first solution with a mass concentration of 10%, zinc nitrate is configured into a second solution with a mass concentration of 15%, and triethylamine is configured into a third solution with a mass concentration of 3%, the second solution and the third solution are added to the first solution under stirring, stirred at 120° C. for 24 hours, and then centrifuged to obtain a precipitate, washed three times with DMF and anhydrous acetone respectively, and dried to obtain a CAP / BIM / Zn framework material;

[0051] S3. Add magnesium aluminum hydrotalcite to ethanol, evenly disperse it, add the CAP / BIM / Zn framework material, heat it to 120° C., react for 4 hours, use a cell crusher to sonicate for 30 minutes, remove the solvent under reduced pressure, and obtain the modified rodent-proof material after drying.

[0052] In the step S1, the mass ratio of 1-(1-adamantyl)-1H-benzimidazole-2-thiol, natural capsaicin, benzoin dimethyl ether and toluene is 5:3:0.2:100; in the step S2, the mass ratio of the first solution, the second solution and the third solution is 20:12:3; in the step S3, the mass ratio of magnesium aluminum hydrotalcite, ethanol and CAP / BIM / Zn framework material is 15:80:3.

[0053] The plasticizer is a combination of dioctyl phthalate and epoxidized soybean oil in a mass ratio of 2:1; the antioxidant is antioxidant 1076; and the lubricant is a combination of stearic acid and oxidized polyethylene wax in a mass ratio of 1:1.

[0054] The core conductor is a twisted and compressed copper wire, the ground wire conductor is a copper-plated steel wire, the core insulation layer and the ground wire insulation layer are polyethylene insulation materials; the filling layer is a polyester fiber tape, the shielding layer is a galvanized copper tape, the inner sheath is silicone rubber, and the armor layer is an aluminum tape. Example 3

[0055] A mildew-resistant, waterproof and rat-proof PVC cable, the structure of which is the same as that of embodiment 1.

[0056] The outer protective layer comprises the following components in parts by weight: 120 parts of PVC resin, 20 parts of EVA resin, 30 parts of plasticizer, 8 parts of calcium zinc stabilizer, 4 parts of modified rodent-proof material, 1 part of antioxidant, 0.8 parts of lubricant, and 1.5 parts of methacrylate.

[0057] The modified rodent-proof material is prepared by the following steps:

[0058] S1. 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin are added to toluene, and benzoin dimethyl ether is added as a catalyst. The mixture is irradiated under ultraviolet light for 15 minutes to cause a thiol-vinyl click reaction. The mixture is then heated to 90° C. and reacted for 2 hours. After the reaction is completed, the toluene is removed under reduced pressure to obtain a CAP / BIM intermediate.

[0059] S2, the CAP / BIM intermediate is configured into a first solution with a mass concentration of 8%, zinc nitrate is configured into a second solution with a mass concentration of 10%, and then triethylamine is configured into a third solution with a mass concentration of 2%, the second solution and the third solution are added to the first solution under stirring, stirred at 100° C. for 16 hours, and then centrifuged to obtain a precipitate, washed three times with DMF and anhydrous acetone respectively, and dried to obtain a CAP / BIM / Zn skeleton material;

[0060] S3. Add magnesium aluminum hydrotalcite to ethanol, evenly disperse it, add the CAP / BIM / Zn skeleton material, heat it to 100° C., react for 2 hours, use a cell crusher to sonicate for 20 minutes, remove the solvent under reduced pressure, and obtain the modified rodent-proof material after drying.

[0061] In the step S1, the mass ratio of 1-(1-adamantyl)-1H-benzimidazole-2-thiol, natural capsaicin, benzoin dimethyl ether and toluene is 3:2:0.1:90; in the step S2, the mass ratio of the first solution, the second solution and the third solution is 15:8:2; in the step S3, the mass ratio of magnesium aluminum hydrotalcite, ethanol and CAP / BIM / Zn framework material is 10:60:2.

[0062] The plasticizer is a combination of trioctyl trimellitate and epoxidized soybean oil in a mass ratio of 2:1; the antioxidant is a combination of antioxidant 1010 and antioxidant 1035 in a mass ratio of 1:3; the lubricant is a combination of calcium stearate, oxidized polyethylene wax and microcrystalline wax in a mass ratio of 1:2:1.

[0063] The core conductor is a twisted and compressed copper wire, the ground wire conductor is a copper-plated steel wire, the core insulation layer and the ground wire insulation layer are polyethylene insulation materials; the filling layer is a polyester fiber tape, the shielding layer is a galvanized copper tape, the inner sheath is silicone rubber, and the armor layer is an aluminum tape. Example 4

[0064] In this embodiment, triisodecyl trimellitate and epoxidized soybean oil are combined in a mass ratio of 2:1, and the rest is the same as in Embodiment 3. Example 5

[0065] A method for preparing a mildew-resistant, waterproof and rat-proof PVC cable comprises the following steps: twisting and pressing copper wires to obtain a core conductor, wrapping polyethylene insulation material around the core conductor and the ground conductor to form a core insulation layer and a ground insulation layer, filling a polyester fiber tape outside the core insulation layer and the ground insulation layer to form a filling layer, arranging a galvanized copper tape outside the filling layer to form a shielding layer, extruding silicone rubber outside the shielding layer to form an inner sheath, weaving an aluminum tape outside the inner sheath to form an armor layer, melting and blending the components of the outer sheath at 100°C through a double-roll mill, and extruding them outside the armor layer at 20MPa and 110°C to form an outer sheath, thereby obtaining the PVC cable.

[0066] Comparative Example 1

[0067] The outer protective layer of this comparative example does not contain the modified rodent-proof material, and the rest is the same as Example 4.

[0068] Comparative Example 2

[0069] In this comparative example, an equal amount of natural capsaicin was used to replace the modified rodent-proof material, and the rest was the same as in Example 4.

[0070] Comparative Example 3

[0071] In this comparative example, an equal amount of 2-mercaptobenzimidazole was used to replace 1-(1-adamantyl)-1H-benzimidazole-2-thiol, and the rest was the same as in Example 4.

[0072] Comparative Example 4

[0073] In this comparative example, an equal amount of CAP / BIM / Zn framework material is used to replace the modified rodent-proof material, and the rest is the same as Example 4.

[0074] Results Analysis

[0075] Test Example 1

[0076] Cable waterproof performance test

[0077] The cables prepared in the examples and comparative examples were immersed in water at 80°C for 18 hours, and the changes in the tensile strength and elongation at break of the cable outer sheath material were tested. The results are shown in Table 1. Figure 2 .

[0078] Depend on Figure 2 The results show that the changes in tensile strength and elongation at break of the cable outer sheath materials of Examples 1-4 are relatively small. This is because the present invention allows the hydrophilic groups of the CAP / BIM / Zn skeleton material to interact electrostatically with the cations of the magnesium-aluminum hydrotalcite, adsorbs the skeleton material on the magnesium-aluminum hydrotalcite, and then uses the adamantyl group in 1-(1-adamantyl)-1H-benzimidazole-2-thiol and the alkyl chain contained in natural capsaicin to enhance the binding of the modified rodent-proof material to the PVC matrix. The rigidity of the adamantyl group and the non-polarity of the alkyl chain improve the hydrophobicity of the PVC material, thereby effectively preventing moisture from staying on the surface of the cable outer sheath for a long time, reducing the influence of moisture on material properties, and allowing the cable to maintain good mechanical properties after waterproof immersion.

[0079] Test Example 2

[0080] Cable flame retardant performance test

[0081] The LOI test of the cables prepared in each embodiment and comparative example was performed using a JF-5 fully automatic oxygen index tester in accordance with the standard of GB / T 2406.2-2009. The sample size was 100 mm × 6.5 mm × 3.0 mm. The results are shown in Figure 3 .

[0082] Depend on Figure 3The results show that the LOI values ​​of the cables of Examples 1-4 are relatively high, indicating that they have good flame retardant properties. This is mainly attributed to the synergistic effect of the nitrogen and phosphorus elements in the modified rodent-proof material prepared by the present invention during the combustion process. The nitrogen-containing groups can decompose to produce inert gases such as nitrogen, dilute the oxygen concentration in the combustion area, and inhibit the combustion reaction. At the same time, the phosphorus-containing groups can promote the formation of a carbon layer on the surface of the polymer, isolate the contact between oxygen and the internal polymer, and prevent the spread of combustion. In addition, magnesium-aluminum hydrotalcite has a unique layered double hydroxide structure. When heated, it will decompose and release bound water, absorb a large amount of heat, reduce the ambient temperature, delay the thermal decomposition of the polymer, further prevent heat transfer and oxygen diffusion, and enhance the flame retardant effect of the cable together with other components in the modified rodent-proof material.

[0083] Test Example 3

[0084] Cable rat-proof performance test

[0085] According to GB / T 34016-2017 "General Rules for Rat-proof and Ant-proof Wires and Cables", the degree of SD rats biting the cable samples was used as the basis, the mass of the outer sheath material before and after being bitten was recorded, the mass change before and after the rats bitten was calculated, and the rodent-proof performance of the cable was evaluated. The samples were subjected to heat aging treatment for 168 hours at 100°C in an aging box, and the above-mentioned rhein biting experiment was repeated to evaluate the continued effectiveness of the cable properties. The results are shown in Figure 4 .

[0086] Depend on Figure 4 It can be seen that the cables prepared in Examples 1-4 all have strong anti-rat bite performance and are continuously effective. This is because the composite structure prepared by the present invention can effectively fix natural capsaicin and reduce its seepage and volatilization during processing and use. During the use of the cable, natural capsaicin can be continuously and slowly released to stimulate mice, thereby ensuring the cable's good and lasting anti-rat performance. However, the natural capsaicin in Comparative Example 2 severely seeps and volatilizes during the preparation and aging process, and cannot continuously and effectively produce a stimulating effect on mice. In the rat gnawing experiment, the mass change of the outer sheath material before and after being bitten is large, and the anti-rat performance is poor.

[0087] Test Example 4

[0088] Cable mildew resistance test

[0089] The cable was tested for mildew resistance according to the method of GB / T 2423.16-2008, and the total number of colonies on the cable was detected by plate counting method. The results are shown in Figure 5 .

[0090] Depend on Figure 5The results show that the cables of Examples 1-4 exhibit good mildew resistance. This is because in the present invention, the hydrophilic groups of the CAP / BIM / Zn skeleton material interact electrostatically with the cations of the magnesium-aluminum hydrotalcite, so that the skeleton material is adsorbed on the magnesium-aluminum hydrotalcite. At the same time, the adamantyl group in 1-(1-adamantyl)-1H-benzimidazole-2-thiol and the alkyl chain in natural capsaicin enhance the binding of the modified rodent-proof material to the PVC matrix. The rigidity of the adamantyl group and the non-polarity of the alkyl chain improve the hydrophobicity of the PVC material, effectively preventing moisture and organic nutrients from staying on the surface of the cable outer sheath for a long time, greatly reducing the humid environment and nutrient supply conditions required for the growth of mold, thereby inhibiting the growth and reproduction of mold, so that the total number of colonies on the surface of the cable outer sheath can be controlled at a low level.

[0091] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0092] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A mildew-resistant, waterproof and rat-proof PVC cable, characterized by: A wire core layer (1) is enclosed, wherein the wire core layer (1) is arranged in a circumferential manner and is provided with four groups, a ground wire layer (2) is provided in the middle of the wire core layer (1), a filling layer (3) is provided outside the wire core layer (1) and the wire core layer (1), a shielding layer (4) is provided outside the filling layer (3), an inner protective layer (5) is provided outside the shielding layer (4), an armor layer (6) is provided outside the inner protective layer (5), and an outer protective layer (7) is provided outside the armor layer (6), the wire core layer (1) comprises a wire core conductor (11) and a wire core insulation layer (12) provided outside the wire core conductor (11), and the ground wire layer (2) comprises a ground wire conductor (21) and a ground wire insulation layer (22) provided outside the ground wire conductor (21); The outer protective layer comprises the following components in parts by weight: 100-150 parts of PVC resin, 10-30 parts of EVA resin, 20-40 parts of plasticizer, 5-10 parts of calcium zinc stabilizer, 3-5 parts of modified rodent-proof material, 0.5-2 parts of antioxidant, 0.5-1 parts of lubricant, and 0.5-2 parts of methacrylate; The modified rodent-proof material is prepared by the following steps: S1. Add 1-(1-adamantyl)-1H-benzimidazole-2-thiol and natural capsaicin to toluene, add benzoin dimethyl ether as a catalyst, irradiate under ultraviolet light for 10-20 minutes, cause a thiol-vinyl click reaction, and then heat to 85-100° C. and react for 1-3 hours. After the reaction is completed, remove toluene under reduced pressure to obtain a CAP / BIM intermediate; S2, the CAP / BIM intermediate is configured into a first solution with a mass concentration of 5%-10%, zinc nitrate is configured into a second solution with a mass concentration of 5%-15%, and triethylamine is configured into a third solution with a mass concentration of 1%-3%, the second solution and the third solution are added to the first solution under stirring, stirred at 80-120° C. for 12-24 hours, and then centrifuged to obtain a precipitate, washed three times with DMF and anhydrous acetone respectively, and dried to obtain a CAP / BIM / Zn framework material; S3. Add magnesium aluminum hydrotalcite to ethanol, evenly disperse it, add the CAP / BIM / Zn framework material, heat to 70-120° C., react for 1-4 hours, use a cell crusher to sonicate for 10-30 minutes, remove the solvent under reduced pressure, and obtain the modified rodent-proof material after drying.

2. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 1, characterized in that: In the step S1, the mass ratio of 1-(1-adamantyl)-1H-benzimidazole-2-thiol, natural capsaicin, benzoin dimethyl ether and toluene is 2-5:1-3:0.05-0.2:80-100.

3. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 2, characterized in that: In the step S2, the mass ratio of the first solution, the second solution and the third solution is 10-20:5-12:1-3.

4. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 3, characterized in that: In the step S3, the mass ratio of magnesium aluminum hydrotalcite, ethanol and CAP / BIM / Zn framework material is 6-15:50-80:1-3.

5. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 4, characterized in that: The plasticizer is a combination of one of dibutyl phthalate, dioctyl phthalate, trioctyl trimellitate and triisodecyl trimellitate and epoxidized soybean oil.

6. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 5, characterized in that: The antioxidant is a combination of one or more of the antioxidant 1010 , the antioxidant 1076 , the antioxidant 1024 and the antioxidant 1035 .

7. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 6, characterized in that: The lubricant is a combination of one or more of calcium stearate, stearic acid, oxidized polyethylene wax and microcrystalline wax.

8. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 7, characterized in that: The core conductor is a twisted and tightly compressed copper wire, the ground wire conductor is a copper-plated steel wire, and the core insulation layer and the ground wire insulation layer are polyethylene insulation materials.

9. The mildew-resistant, waterproof and rat-proof PVC cable according to claim 8, characterized in that: The filling layer is a polyester fiber tape, the shielding layer is a galvanized copper tape, the inner protective layer is a silicone rubber, and the armor layer is an aluminum tape.

10. A method for preparing a mildew-resistant, waterproof and rat-proof PVC cable according to any one of claims 1 to 9, characterized in that: The following steps are involved: The copper wires are twisted and pressed to obtain a core conductor, and then polyethylene insulation material is wrapped around the outside of the core conductor and the ground conductor to form a core insulation layer and a ground insulation layer, a polyester fiber tape is filled outside the core insulation layer and the ground insulation layer to form a filling layer, a galvanized copper tape is arranged outside the filling layer to form a shielding layer, silicone rubber is extruded outside the shielding layer to form an inner sheath, an aluminum tape is woven outside the inner sheath to form an armor layer, and the components of the outer sheath are melt-blended at 100° C. through a double-roll mill, and then extruded outside the armor layer at 20MPa and 110° C. to form an outer sheath, thereby obtaining the PVC cable.

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