Anti-aging bus control cable and preparation method thereof

Abstract

The invention discloses an anti-aging bus control cable and a preparation method thereof, and belongs to the technical field of cables. According to the anti-aging bus control cable, the mechanical strength and the damage resistance of the cable are remarkably improved by adopting a multi-layer structural design, and the anti-aging and mechanical properties of the control cable are remarkably improved by improving the material of the outer sheath.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to an anti-aging bus control cable and a preparation method thereof. Background Art

[0002] The bus control cable is a special cable designed for bus communication in industrial automation systems, used to transmit control signals, measurement data, and bus protocol information between devices. Its core function is to achieve digital communication between devices, ensuring the stability, real-time performance, and anti-interference ability of signal transmission, and is widely used in industrial control, building automation, transportation systems, and other fields.

[0003] As the outermost layer material of the cable, the cable outer sheath has a great influence on the comprehensive performance of the cable. During actual use, the cable will be affected by external factors such as pulling force, extrusion force, bending force, torsion force, friction force, and vibration force, as well as the erosion of chemicals such as acids, alkalis, and salts; and the action of physical factors such as light, heat, and humidity. It is required that the outer sheath not only has excellent physical properties, such as tensile strength, elongation at break, etc., but also has good heat resistance and anti-aging performance. Although there are various cables on the market now, the performance of the sheath materials of most cables is still not very ideal. During the use of the cable, there are defects in not very ideal heat resistance and anti-aging properties, shortening the service life of the cable, increasing economic pressure, and posing potential safety hazards.

[0004] Chinese Patent Document CN104311926A discloses an anti-aging cable sheath material, the raw materials of which by weight include: 60-80 parts of styrene-butadiene rubber, 20-40 parts of epoxidized natural rubber, 5-10 parts of ethylene-vinyl acetate copolymer, 10-30 parts of nano-silica, 5-20 parts of activated calcium silicate, 5-15 parts of nano-silicon dioxide, 5-10 parts of stearic acid, 3-8 parts of zinc oxide, 15-30 parts of biochar, 5-13 parts of rapeseed oil, 3-8 parts of coconut oil, 4-10 parts of olive oil, 3-7 parts of benzoyl peroxide, 0.5-1.3 parts of glycerol, 0.2-1 part of trimethylolpropane, 0.2-1.3 parts of pentaerythritol, 1-3 parts of accelerator, and 5-8 parts of antioxidant. The anti-aging cable sheath material described in the invention has excellent anti-aging performance, high strength, good comprehensive performance of the cable sheath made, and long service life. However, this patent has the defects of using many raw materials, complex formula, poor compatibility between the nano-fillers nano-silica, activated calcium silicate, nano-silicon dioxide and the rubber matrix, and the antioxidant is easy to precipitate from the rubber matrix. Summary of the Invention

[0005] The main object of the present invention is to provide an anti-aging bus control cable and a preparation method thereof. The control cable adopts a multi-layer structure design, significantly improving the mechanical strength and anti-damage ability of the cable. By improving the outer sheath material, the anti-aging and mechanical properties of the control cable are significantly improved.

[0006] To achieve the above object, the present invention provides an anti-aging bus control cable, including a conductor, an insulating layer, a filling layer, a shielding layer, an inner sheath layer, an armor layer and an outer sheath layer; the conductor is tightly wrapped with the insulating layer to obtain an insulated wire core, and then 2 insulated wire cores are twisted to obtain a twisted pair; after filling 2 twisted pairs with the filling layer and then covering them with the shielding layer to obtain a cable core, the cable core is sequentially covered with an inner sheath layer, an armor layer and an outer sheath layer from inside to outside.

[0007] Preferably, the conductor is formed by twisting a plurality of copper round wires; the insulating layer is an ethylene-propylene rubber insulating material; the filling layer is filled with polyolefin porous filler; the shielding layer is a copper braided mesh; the inner sheath layer is a common polyvinyl chloride sheath; the armor layer is a steel spiral winding tape.

[0008] Preferably, the outer sheath layer is made of an outer sheath material, and the outer sheath material, by weight, includes the following components: 40-60 parts of styrene-butadiene rubber, 20-30 parts of natural rubber, 3-5 parts of ethylene-octene copolymer, 2-3 parts of vulcanizing agent, 10-20 parts of modified nano-zinc oxide, 0.1-2 parts of vulcanization aid, 2-4 parts of activator, 0.5-2 parts of antioxidant, 5-15 parts of flame retardant.

[0009] Preferably, the vulcanizing agent is at least one of dicumyl peroxide, sulfur, and sodium isobutyl xanthate.

[0010] Preferably, the preparation method of the modified nano-zinc oxide is as follows:

[0011] Adding nano-zinc oxide powder into ethyl acetate, ultrasonically dispersing and then adding isocyanate propyltriethoxysilane, reacting to obtain isocyanate zinc oxide; adding the isocyanate zinc oxide into toluene, adding 4-allyloxy-2-hydroxybenzophenone and stannous octoate, stirring and reacting, after the reaction is completed, obtaining a solid product, adding the solid product into N,N-dimethylformamide and mixing evenly, adding 2,4,6-triallyloxy-1,3,5-triazine and an initiator, heating and reacting, after the reaction is completed, collecting the solid product, washing and drying to obtain the modified nano-zinc oxide.

[0012] Preferably, the mass ratio of the nano-zinc oxide to the isocyanate propyltriethoxysilane is 15-25:3-6.

[0013] Preferably, the mass ratio of isocyanate group zinc oxide, 4 - allyloxy - 2 - hydroxybenzophenone, stannous octoate, 2,4,6 - triallyloxy - 1,3,5 - triazine, and initiator is 1.2 - 1.3:1:0.1 - 0.3:0.8 - 1.2:0.3 - 0.5; the stirring reaction temperature is 50 - 80°C, and the reaction time is 1 - 3 h; the heating reaction temperature is 70 - 90°C, and the reaction time is 3 - 5 h.

[0014] Nano - zinc oxide is a nano - ultraviolet absorber that can absorb and block long - wave ultraviolet rays. By modifying it, the advantages of inorganic and organic ultraviolet absorbers are combined and it can be evenly dispersed in the sheath matrix. The organic ultraviolet absorber and zinc oxide can have a synergistic effect to achieve full - band shielding of ultraviolet rays, thus achieving a good anti - aging effect, and the organic ultraviolet absorber is not likely to migrate out of the sheath matrix to affect its anti - ultraviolet aging performance.

[0015] Preferably, the vulcanization accelerator is at least one of zinc dimethyldithiocarbamate, tetraethylthiuram disulfide, zinc dibutyldithiocarbamate, and N - tert - butyl - 2 - benzothiazole sulfenamide.

[0016] Preferably, the activator is at least one of zinc oxide, stearic acid, zinc stearate, and calcium stearate.

[0017] Preferably, the antioxidant is at least one of 4 - methyl - 6 - tert - butylphenol, 2,5 - di - tert - butylhydroquinone, and p - phenylenediamine.

[0018] Preferably, the flame retardant is triphenyl phosphate.

[0019] The present invention also discloses a preparation method of the outer sheath material, including the following steps:

[0020] Put styrene - butadiene rubber, natural rubber, modified nano - zinc oxide, ethylene - octene copolymer, vulcanization accelerator, activator, antioxidant, and flame retardant into a mixer for mixing, discharging, and sheet - making, then transfer it to a flat vulcanizer, add a vulcanizing agent, and carry out vulcanization molding, and the outer sheath material is obtained after discharging.

[0021] Preferably, the mixing temperature is 80 - 95°C, and the mixing time is 10 - 15 min; in step S2, the vulcanization temperature is 140 - 160°C, the vulcanization time is 9 - 12 min, and the pressure is 10 - 15 MPa.

[0022] Compared with the prior art, the beneficial effects of the present invention:

[0023] (1) The anti-aging bus control cable of the present invention adopts a multi-layer structure design, significantly improving the mechanical strength and anti-damage ability of the cable; the cable core is stranded with copper round wires, having good electrical conductivity and flexibility; the insulation layer uses an EPR insulation layer, ensuring excellent heat resistance, electrical insulation performance, and stable working performance; the filler layer selects polyolefin porous filler, effectively increasing the filling property and structural stability, while reducing the overall weight of the cable; the shielding layer uses a copper braided net, providing good anti-electromagnetic interference ability for the cable; the inner sheath layer uses a common polyvinyl chloride sheath, playing a role of sealing and protection; the armor layer uses a steel spiral winding tape, enhancing the anti-mechanical impact and tensile strength of the cable, making it more reliable in complex environments; the outer sheath layer enhances the anti-ultraviolet aging performance of the cable, enabling the cable to maintain excellent performance in an environment of long-term ultraviolet and chemical corrosion, and extending the service life of the cable;

[0024] (2) The outer sheath material of the present invention uses styrene-butadiene rubber with excellent heat resistance and anti-aging as the main raw material, supplemented by inexpensive natural rubber, reducing the material cost. By adding modified nano-zinc oxide to the outer sheath material, the anti-ultraviolet aging performance and mechanical properties of the outer sheath material can be significantly improved;

[0025] (3) The preparation of the modified zinc oxide of the present invention is first to perform surface treatment on it with isocyanatopropyltriethoxysilane, introducing an active group isocyanate group on its surface. Then, the isocyanate group reacts with the hydroxyl group on the benzophenone-based ultraviolet absorber 4-propenyloxy-2-hydroxybenzophenone, grafting 4-propenyloxy-2-hydroxybenzophenone onto the zinc oxide. The benzophenone group on its molecule can absorb ultraviolet rays to inhibit photodegradation, releasing the energy in the form of heat, and introducing acryloxy groups. Finally, the acryloxy groups and 2,4,6-triallyloxy-1,3,5-triazine undergo an addition reaction under the action of an initiator. The triazine ring on its molecule can absorb part of the ultraviolet radiation, further improving the anti-yellowing performance of the outer sheath material. At the same time, the surplus carbon-carbon double bonds on its molecule can also undergo an addition reaction with the carbon-carbon double bonds in the styrene-butadiene rubber and natural rubber molecules during the rubber vulcanization process, improving the binding property between the nano-zinc oxide and the rubber matrix, and thus improving the mechanical properties of the outer sheath material. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0027] Figure 1Schematic cross - sectional structure diagram of the anti - aging bus control cable of the present invention;

[0028] Among them, 1. Conductor; 2. Insulation layer; 3. Filler layer; 4. Shielding layer; 5. Inner sheath layer; 6. Armor layer; 7. Outer sheath layer.

[0029] The realization of the purpose, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0030] To avoid unnecessary repetition, unless otherwise specified, the items used in the following embodiments are all commercially available products, and the methods used are all conventional methods unless otherwise specified.

[0031] The sources of some raw materials used in the present invention are as follows:

[0032] Zinc oxide, with a particle size of 30 - 50nm and a model of HN - J50L, purchased from Hangzhou Hengge Nano - Technology Co., Ltd.

[0033] Styrene - butadiene rubber, with a grade of SOL T 6303 and a melt index < 1g / 10min, purchased from Guangzhou Degao New Materials Co., Ltd.

[0034] Natural rubber, with a model of 3L, purchased from Guangxi Wusen New Materials Technology Co., Ltd.

[0035] Embodiment 1

[0036] A preparation method of an outer sheath material, comprising the following steps:

[0037] Put 50g of styrene - butadiene rubber, 25g of natural rubber, 4g of ethylene - octene copolymer, 15.8g of modified nano - zinc oxide, 1.2g of N - tert - butyl - 2 - benzothiazole sulfenamide, 3g of zinc stearate, 1.1g of 4 - methyl - 6 - tert - butylphenol, and 10g of triphenyl phosphate into a mixer for mixing. The mixing temperature is 90°C, the mixing time is 12min, discharge the rubber, take out the sheet, then transfer it to a flat vulcanizer, add 2.5g of dicumyl peroxide, and carry out vulcanization molding. The vulcanization temperature is 150°C, the vulcanization time is 10min, the pressure is 12MPa, and the product is discharged to obtain the outer sheath material.

[0038] The preparation method of the modified nano - zinc oxide is as follows:

[0039] Add 20 g of nano-zinc oxide powder to 200 mL of ethyl acetate. After ultrasonic dispersion, add 4.8 g of isocyanatopropyltriethoxysilane and react at 50 °C for 3 h. Filter to collect the solid, wash and dry to obtain isocyanatopropyl zinc oxide; add 12.5 g of isocyanatopropyl zinc oxide to 200 mL of toluene, add 10 g of 4-propenyloxy-2-hydroxybenzophenone and 2 g of stannous octoate, heat and stir at 60 °C for 2 h. After the reaction, collect the solid, wash and dry to obtain a solid product. Add the solid product to 200 mL of N,N-dimethylformamide and mix evenly. Add 10 g of 2,4,6-triallyloxy-1,3,5-triazine and 4 g of ammonium persulfate, and heat and react at 80 °C for 4 h. After the reaction, collect the solid product, wash and dry to obtain modified nano-zinc oxide.

[0040] Example 2

[0041] A preparation method of an outer sheath material comprises the following steps:

[0042] Put 40 g of styrene-butadiene rubber, 20 g of natural rubber, 3 g of ethylene-octene copolymer, 10 g of modified nano-zinc oxide, 0.1 g of zinc dibutyldithiocarbamate, 2 g of stearic acid, 0.5 g of 2,5-di-tert-butylhydroquinone, and 5 g of triphenyl phosphate into a kneader for kneading. The kneading temperature is 80 °C, the kneading time is 10 min, discharge the rubber, take out the sheet, and then transfer it to a flat vulcanizer. Add 2.5 g of dicumyl peroxide and carry out vulcanization molding. The vulcanization temperature is 140 °C, the vulcanization time is 9 min, and the pressure is 15 MPa. Discharge the material to obtain the outer sheath material.

[0043] The preparation method of the modified nano-zinc oxide is as follows:

[0044] Add 15 g of nano-zinc oxide powder to 200 mL of ethyl acetate. After ultrasonic dispersion, add 3.2 g of isocyanatopropyltriethoxysilane and react at 50 °C for 3 h. Filter to collect the solid, wash and dry to obtain isocyanatopropyl zinc oxide; add 12 g of isocyanatopropyl zinc oxide to 200 mL of toluene, add 10 g of 4-propenyloxy-2-hydroxybenzophenone and 1 g of stannous octoate, heat and stir at 60 °C for 2 h. After the reaction, collect the solid, wash and dry to obtain a solid product. Add the solid product to 200 mL of N,N-dimethylformamide and mix evenly. Add 8.3 g of 2,4,6-triallyloxy-1,3,5-triazine and 3 g of ammonium persulfate, and heat and react at 80 °C for 4 h. After the reaction, collect the solid product, wash and dry to obtain modified nano-zinc oxide.

[0045] Example 3

[0046] A preparation method of an outer sheath material comprises the following steps:

[0047] Put 60 g of styrene-butadiene rubber, 30 g of natural rubber, 5 g of ethylene-octene copolymer, 20 g of modified nano-zinc oxide, 2 g of tetraethylthiuram disulfide, 4 g of calcium stearate, 2 g of p-phenylenediamine, and 15 g of triphenyl phosphate into a kneader for kneading. The kneading temperature is 95 °C, the kneading time is 15 min, discharge the rubber, take out the sheet, then transfer it to a flat vulcanizer, add 2.5 g of dicumyl peroxide, and carry out vulcanization molding. The vulcanization temperature is 160 °C, the vulcanization time is 12 min, and the pressure is 10 MPa. After discharging, the outer sheath material is obtained.

[0048] The preparation method of the modified nano-zinc oxide is as follows:

[0049] Add 25 g of nano-zinc oxide powder to 200 mL of ethyl acetate. After ultrasonic dispersion, add 6 g of isocyanatopropyltriethoxysilane and react at 50 °C for 3 h. Filter and collect the solid, wash and dry to obtain isocyanato-zinc oxide; add 13 g of isocyanato-zinc oxide to 200 mL of toluene, add 10 g of 4-allyloxy-2-hydroxybenzophenone and 3 g of stannous octoate, heat and stir at 60 °C for 2 h. After the reaction, collect the solid, wash and dry to obtain a solid product. Add the solid product to 200 mL of N,N-dimethylformamide and mix evenly. Add 12 g of 2,4,6-triallyloxy-1,3,5-triazine and 5 g of ammonium persulfate, and heat and react at 80 °C for 4 h. After the reaction, collect the solid product, wash and dry to obtain the modified nano-zinc oxide.

[0050] Comparative Example 1

[0051] A preparation method of an outer sheath material is similar to that of Example 1, except that 2,4,6-triallyloxy-1,3,5-triazine is not added to the modified nano-zinc oxide. The specific steps are as follows:

[0052] Put 50 g of styrene-butadiene rubber, 25 g of natural rubber, 4 g of ethylene-octene copolymer, 15.8 g of modified nano-zinc oxide, 1.2 g of N-tert-butyl-2-benzothiazolesulfenamide, 3 g of zinc stearate, 1.1 g of 4-methyl-6-tert-butylphenol, and 10 g of triphenyl phosphate into a kneader for kneading. The kneading temperature is 90 °C, the kneading time is 12 min, discharge the rubber, take out the sheet, then transfer it to a flat vulcanizer, add 2.5 g of dicumyl peroxide, and carry out vulcanization molding. The vulcanization temperature is 150 °C, the vulcanization time is 10 min, and the pressure is 12 MPa. After discharging, the outer sheath material is obtained.

[0053] The preparation method of the modified nano-zinc oxide is as follows:

[0054] Add 20 g of nano-zinc oxide powder to 200 mL of ethyl acetate. After ultrasonic dispersion, add 4.8 g of isocyanatopropyltriethoxysilane and react at 50 °C for 3 h. Filter to collect the solid, wash and dry to obtain isocyanatopropyl zinc oxide. Add 12.5 g of isocyanatopropyl zinc oxide to 200 mL of toluene, add 10 g of 4-propenyloxy-2-hydroxybenzophenone and 2 g of stannous octoate, heat and stir at 60 °C for 2 h. After the reaction, collect the solid, wash and dry to obtain the solid product, which is the modified nano-zinc oxide.

[0055] Comparative Example 2

[0056] A preparation method of an outer sheath material is similar to Example 1, except that the modified nano-zinc oxide is a mixture of 12.5 g of nano-zinc oxide, 10 g of 4-propenyloxy-2-hydroxybenzophenone and 10 g of 2,4,6-triallyloxy-1,3,5-triazine, and specifically includes the following steps:

[0057] Put 50 g of styrene-butadiene rubber, 25 g of natural rubber, 4 g of ethylene-octene copolymer, 15.8 g of modified zinc oxide, 1.2 g of N-tert-butyl-2-benzothiazole sulfenamide, 3 g of zinc stearate, 1.1 g of 4-methyl-6-tert-butylphenol, and 10 g of triphenyl phosphate into a kneader for kneading. The kneading temperature is 90 °C, the kneading time is 12 min, discharge the rubber, take out the sheet, then transfer it to a flat vulcanizer, add 2.5 g of dicumyl peroxide, and carry out vulcanization molding. The vulcanization temperature is 150 °C, the vulcanization time is 10 min, and the pressure is 12 MPa. Discharge to obtain the outer sheath material.

[0058] The preparation method of the modified nano-zinc oxide is to mix 12.5 g of nano-zinc oxide, 10 g of 4-propenyloxy-2-hydroxybenzophenone and 10 g of 2,4,6-triallyloxy-1,3,5-triazine and stir evenly.

[0059] Comparative Example 3

[0060] A preparation method of an outer sheath material is similar to Example 1, except that the modified nano-zinc oxide is a mixture of 12.5 g of isocyanatopropyl zinc oxide and 10 g of 2,4,6-triallyloxy-1,3,5-triazine, and specifically includes the following steps:

[0061] Mix 50 g of styrene-butadiene rubber, 25 g of natural rubber, 4 g of ethylene-octene copolymer, 15.8 g of modified nano-zinc oxide, 1.2 g of N-tert-butyl-2-benzothiazole sulfenamide, 3 g of zinc stearate, 1.1 g of 4-methyl-6-tert-butylphenol, and 10 g of triphenyl phosphate in a kneader. The kneading temperature is 90 °C, the kneading time is 12 min, discharge the rubber, take out the sheet, then transfer it to a flat vulcanizer, add 2.5 g of dicumyl peroxide, and carry out vulcanization molding. The vulcanization temperature is 150 °C, the vulcanization time is 10 min, and the pressure is 12 MPa. After discharging, the outer sheath material is obtained.

[0062] The preparation method of the modified nano-zinc oxide is to uniformly mix 12.5 g of isocyanate group zinc oxide and 10 g of 2,4,6-triallyloxy-1,3,5-triazine by stirring.

[0063] Application Example

[0064] An aging-resistant bus control cable, whose cross-sectional view is as Figure 1 shown. Its preparation method is as follows: Strands 45 tinned soft copper wires into one strand, arrange and twist them according to one strand in the center and eight strands on the outer layer, and obtain conductor 1 after compacting. Wrap conductor 1 tightly with ethylene-propylene rubber insulating material to obtain an insulated wire core, and then twist 2 insulated wire cores to obtain a twisted pair; Fill 2 twisted pairs with polyolefin porous filler and then cover them with a copper braided mesh to obtain a cable core; Outside the copper braided mesh, there are successively coated with an ordinary polyvinyl chloride inner sheath layer, an armor layer 6 composed of a steel spiral winding tape, and an outer sheath material layer 7 prepared in Example 1.

[0065] Performance Test

[0066] Measure the tensile strength and elongation at break of the outer sheath materials of Examples 1-3 and Comparative Examples 1-3 respectively according to the "General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables" (GB / T 2951-2008); Measure the tensile strength retention rate after ultraviolet aging according to the "Test Method for Artificial Weathering of Vulcanized Rubber (Fluorescent Ultraviolet Lamp)" (GB / T 16585-1996); The test results are shown in Table 1:

[0067] Table 1 Performance Test Results of Outer Sheath Materials

[0068]

[0069] It can be seen from the experimental results in Table 1 that the outer sheath material prepared by the present invention has good aging resistance and mechanical properties.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the patent protection scope of the present invention.

Claims

1. An anti-aging bus control cable, characterized in that, It includes a conductor (1), an insulating layer (2), a filling layer (3), a shielding layer (4), an inner sheath layer (5), an armor layer (6) and an outer sheath layer (7); the conductor 1 is tightly wrapped with the insulating layer (2) to obtain an insulated core, and then 2 insulated cores are twisted together to obtain a twisted pair; after filling 2 twisted pairs with the filling layer (3), they are coated with the shielding layer (4) to obtain a cable core, and the cable core is sequentially coated with an inner sheath layer (5), an armor layer (6) and an outer sheath layer (7) from inside to outside; the outer sheath layer (7) is made of an outer sheath material, and the outer sheath material, by weight, includes the following components: 40-60 parts of styrene-butadiene rubber, 20-30 parts of natural rubber, 3-5 parts of ethylene-octene copolymer, 2-3 parts of vulcanizing agent, 10-20 parts of modified nano zinc oxide, 0.1-2 parts of vulcanization aid, 2-4 parts of activator, 0.5-2 parts of antioxidant, 5-15 parts of flame retardant.

2. The aging-resistant bus control cable according to claim 1, characterized in that: The conductor (1) is formed by twisting a number of copper round wires together; the insulating layer (2) is an ethylene-propylene rubber insulating material; the filling layer (3) is filled with polyolefin porous filler; the shielding layer (4) is a copper woven mesh; the inner sheath layer (5) is a common polyvinyl chloride sheath; The armor layer (6) is a steel spiral winding tape.

3. The weather-resistant bus control cable according to claim 1, characterized in that: The vulcanizing agent is at least one of dicumyl peroxide, sulfur, and sodium isobutyl xanthate.

4. The anti-aging bus control cable according to claim 1, characterized in that, The preparation method of the modified nano zinc oxide is as follows: Add nano zinc oxide powder into ethyl acetate, after ultrasonic dispersion, add isocyanate group propyltriethoxysilane, and react to obtain isocyanate group zinc oxide; add isocyanate group zinc oxide into toluene, add 4-propenyloxy-2-hydroxybenzophenone and stannous octoate, stir and react, after the reaction is completed, obtain a solid product, add the solid product into N,N-dimethylformamide and mix evenly, add 2,4,6-triallyloxy-1,3,5-triazine and an initiator, heat and react, after the reaction is completed, collect the solid product, wash and dry to obtain modified nano zinc oxide.

5. The weather-resistant bus control cable according to claim 4, characterized in that: The mass ratio of the nano zinc oxide to the isocyanate group propyltriethoxysilane is 15-25:3-6.

6. The aging-resistant bus control cable according to claim 4, wherein: The mass ratio of the isocyanate group zinc oxide, 4-propenyloxy-2-hydroxybenzophenone, stannous octoate, 2,4,6-triallyloxy-1,3,5-triazine, and the initiator is 1.2-1.3:1:0.1-0.3:0.8-1.2:0.3-0.

5.

7. The anti-aging bus control cable according to claim 4, wherein: The temperature of the stirring reaction is 50-80 °C, and the reaction time is 1-3 h; the temperature of the heating reaction is 70-90 °C, and the reaction time is 3-5 h.

8. The anti-aging bus control cable according to claim 1, characterized in that: The vulcanization aid is at least one of zinc dimethyldithiocarbamate, tetraethylthiuram disulfide, zinc dibutyldithiocarbamate, and N-tert-butyl-2-benzothiazole sulfenamide.

9. The anti-aging bus control cable according to claim 1, wherein: The flame retardant is triphenyl phosphate.

10. The anti-aging bus control cable according to claim 7, characterized in that, The preparation method of the outer sheath material includes the following steps: Mix styrene-butadiene rubber, natural rubber, modified nano zinc oxide, ethylene-octene copolymer, vulcanization aids, activators, anti-aging agents, and flame retardants in a Banbury mixer, discharge the rubber, cut it into sheets, then transfer it to a flat vulcanizing machine, add a vulcanizing agent, and carry out vulcanization molding. The outer sheath material is obtained after discharging.

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