Aging-resistant bus control cable and a method for manufacturing the same

Abstract

The application discloses an anti-aging bus control cable and a preparation method thereof, and belongs to the technical field of cables.The anti-aging bus control cable is designed in a multilayer structure, the mechanical strength and damage resistance of the cable are significantly improved, and the anti-aging and mechanical properties of the control cable are significantly improved by improving the outer sheath material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to an anti-aging bus control cable and a preparation method thereof. BACKGROUND

[0002] The bus control cable is a special cable designed for bus communication in industrial automation systems, which is used for transmitting control signals, measurement data and bus protocol information between devices. Its core function is to realize digital communication between devices, ensure 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] The outer sheath of the cable, as the outermost material of the cable, has a great influence on the comprehensive performance of the cable. In the actual use process, 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 chemical erosion such as acid, alkali and salt; and the action of physical factors such as light, heat and moisture. Not only does it require excellent physical properties such as tensile strength and elongation at break, but also good heat resistance and anti-aging performance. Although there are various cables on the market, the performance of the sheath material of most cables is not very ideal. The cables have the defects of not very ideal heat resistance and anti-aging performance in the process of use, which shortens the service life of the cables, increases the economic pressure, and has safety hazards.

[0004] Chinese patent document CN104311926A discloses a kind of anti-aging cable sheath material, raw materials include by weight parts: styrene-butadiene rubber 60-80 parts, epoxidized natural rubber 20-40 parts, ethylene-vinyl acetate copolymer 5-10 parts, nano white carbon black 10-30 parts, active calcium silicate 5-20 parts, nano silicon dioxide 5-15 parts, stearic acid 5-10 parts, zinc oxide 3-8 parts, biological carbon 15-30 parts, rapeseed oil 5-13 parts, coconut oil 3-8 parts, olive oil 4-10 parts, benzoyl peroxide 3-7 parts, glycerol 0.5-1.3 parts, trimethylolpropane 0.2-1 part, pentaerythritol 0.2-1.3 parts, accelerator 1-3 parts, antioxidant 5-8 parts. The anti-aging cable sheath material has excellent anti-aging performance, high strength, good comprehensive performance of the cable sheath, and long service life, but the patent has the defects of using many raw materials, complex formula, and poor compatibility between nano fillers nano white carbon black, active calcium silicate, nano silicon dioxide and rubber matrix, and the antioxidant is easy to precipitate from the rubber matrix. SUMMARY

[0005] The main purpose of the present application is to provide a kind of anti-aging bus control cable and its preparation method, the control cable adopts multi-layer structure design, the mechanical strength and damage resistance of cable are significantly improved, by improving the outer sheath material, the anti-aging and mechanical properties of control cable are significantly improved.

[0006] To achieve the above object, the present application provides an anti-aging bus control cable, comprising 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 two insulated wire cores are twisted to obtain a twisted pair; the twisted pair is filled with the filling layer and then coated with the shielding layer to obtain a cable core, which is coated with the inner sheath layer, the armor layer and the 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; and the armor layer is a steel spiral winding belt.

[0008] Preferably, the outer sheath layer is made of an outer sheath material, which comprises the following components by weight: 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 vulcanizing aid, 2-4 parts of activator, 0.5-2 parts of antioxidant and 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] Nano zinc oxide powder is added to ethyl acetate, ultrasonic dispersion is carried out, isocyanate propyl triethoxysilane is added, and isocyanate zinc oxide is obtained by reaction; the isocyanate zinc oxide is added to toluene, 4-propyleneoxy-2-hydroxybenzophenone and stannous octoate are added, stirring reaction is carried out, and solid product is obtained after reaction; the solid product is added to N,N-dimethylformamide and mixed uniformly, 2,4,6-triallyloxy-1,3,5-triazine and initiator are added, heating reaction is carried out, and solid product is collected after reaction, and the modified nano zinc oxide is obtained after washing and drying.

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

[0013] Preferably, the mass ratio of the isocyanate zinc oxide, 4-propyleneoxy-2-hydroxybenzophenone, stannous octoate, 2,4,6-triallyloxy-1,3,5-triazine, initiator is 1.2-1.3:1:0.1-0.30.8-1.2:0.3-0.5; the stirring reaction temperature is 50-80 DEG C, and the reaction time is 1-3h; the heating reaction temperature is 70-90 DEG C, and the reaction time is 3-5h.

[0014] The nano zinc oxide is a nano ultraviolet absorber, can absorb and block long wave ultraviolet rays, and through modification, combines the advantages of inorganic and organic ultraviolet absorbers and can be uniformly dispersed in the sheath matrix, and the organic ultraviolet absorber can be synergized with zinc oxide to achieve full-band shielding of ultraviolet rays, thereby achieving good anti-aging effect, and the organic ultraviolet absorber is not easy to migrate out of the sheath matrix to affect the anti-ultraviolet aging performance.

[0015] Preferably, the vulcanization aid is at least one of zinc dimethyl dithiocarbamate, tetraethylthiuram disulfide, zinc dibutyl dithiocarbamate 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 application further discloses a preparation method of the outer sheath material.

[0020] The butadiene styrene rubber, natural rubber, modified nano zinc oxide, ethylene-octene copolymer, vulcanization aid, activator, antioxidant and flame retardant are put into a mixing mill for mixing, glue is discharged, a sheet is discharged, and then transferred to a flat vulcanizing machine, a vulcanizing agent is added, and vulcanization forming is carried out, so that the outer sheath material is obtained.

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

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] (1) The anti-aging bus control cable of the present application significantly improves the mechanical strength and damage resistance of the cable by adopting a multi-layer structure design; the cable core adopts copper round wire twisting, which has good electrical conductivity and flexibility; the insulation layer adopts EPR insulation layer, which ensures excellent heat resistance, electrical insulation performance and stable working performance; the filler layer selects polyolefin porous filler, which effectively increases the filling property and structural stability, while reducing the overall weight of the cable; the shielding layer adopts copper braid, which provides the cable with good anti-electromagnetic interference ability; the inner sheath layer uses ordinary polyvinyl chloride sheath, which plays a sealing protection role; the armor layer adopts steel spiral winding belt, which improves the mechanical impact resistance and tensile strength of the cable, so that the reliability of the cable is higher in complex environment; the outer sheath layer enhances the anti-ultraviolet aging performance of the cable, so that the cable can maintain excellent performance in long-term ultraviolet and chemical corrosion environment, prolonging the service life of the cable;

[0024] (2) The outer sheath material of the present application takes excellent heat-resistant and anti-aging styrene-butadiene rubber as the main raw material, supplemented by cheap natural rubber, which reduces the cost of the material, and by adding modified nano zinc oxide in the outer sheath material, the ultraviolet aging resistance and mechanical properties of the outer sheath material can be significantly improved;

[0025] (3) The preparation of the modified zinc oxide of the present application first uses isocyanate propyl triethoxysilane for surface treatment, introducing active group isocyanate group on the surface, then the isocyanate group reacts with the hydroxyl group on the benzophenone ultraviolet absorber 4-propyleneoxy-2-hydroxybenzophenone, grafting 4-propyleneoxy-2-hydroxybenzophenone on zinc oxide, the benzophenone group on the molecule can absorb ultraviolet rays to inhibit photodegradation, and release energy in the form of heat, and introduce acryloyloxy group, finally the acryloyloxy group reacts with 2,4,6-triallyloxy-1,3,5-triazine under the action of initiator, the triazine ring on the molecule can absorb part of the ultraviolet radiation, further improving the yellowing resistance of the outer sheath material, and the excess carbon-carbon double bond on the molecule can also adduct with the carbon-carbon double bond in the styrene-butadiene rubber and natural rubber molecules during the rubber vulcanization process, improving the combination of nano zinc oxide and rubber matrix, and further improving the mechanical properties of the outer sheath material. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other related drawings according to these drawings without creating any inventive labor.

[0027] Figure 1A cross-section structure diagram of the anti-aging bus control cable of the present application is shown in the figure;

[0028] Wherein, 1, conductor; 2, insulation layer; 3, filler layer; 4, shielding layer; 5, inner sheath layer; 6, armored layer; 7, outer sheath layer.

[0029] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0030] For the sake of brevity, the articles used in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

[0031] Part of the raw materials used in the present application are as follows:

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

[0033] Styrene-butadiene rubber, brand SOL T 6303, melt index <1 g / 10 min, purchased from Guangzhou Degao New Material Co., Ltd.

[0034] Natural rubber, model 3L, purchased from Guangxi Wusen New Material Technology Co., Ltd.

[0035] Example 1

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

[0037] 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-butyl phenol, and 10g of triphenyl phosphate were put into a mixing mill for mixing, the mixing temperature was 90℃, the mixing time was 12min, the glue was discharged, the sheet was discharged, and then transferred to a flat vulcanizing machine, 2.5g of dicumyl peroxide was added, and vulcanization molding was carried out, the vulcanization temperature was 150℃, the vulcanization time was 10min, the pressure was 12MPa, and the material was discharged to obtain the outer sheath material.

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

[0039] The isocyanate group zinc oxide was prepared by adding 20 g of nano zinc oxide powder into 200 mL of ethyl acetate, ultrasonic dispersion, then adding 4.8 g of isocyanate group propyl triethoxysilane, and reacting at 50°C for 3 h. The solid was collected by filtration, washed and dried. The 4-propenyloxy-2-hydroxybenzophenone modified zinc oxide was prepared by adding 12.5 g of the isocyanate group zinc oxide into 200 mL of toluene, adding 10 g of 4-propenyloxy-2-hydroxybenzophenone, 2 g of stannous octoate, and stirring and heating at 60°C for 2 h. After the reaction was completed, the solid was collected, washed and dried to obtain the solid product. The solid product was added into 200 mL of N,N-dimethylformamide, mixed uniformly, 10 g of 2,4,6-triallyloxy-1,3,5-triazine and 4 g of ammonium persulfate were added, and the mixture was heated at 80°C for 4 h. After the reaction was completed, the solid product was collected, washed and dried to obtain the modified nano zinc oxide.

[0040] Example 2

[0041] A method for preparing an outer sheath material, comprising the following steps:

[0042] The outer sheath material was prepared by adding 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-butyl hydroquinone, and 5 g of triphenyl phosphate into a mixer, mixing at a temperature of 80°C for 10 min, discharging, sheeting, and then transferring to a flat vulcanizing machine. 2.5 g of dicumyl peroxide was added, and the mixture was vulcanized and formed at a temperature of 140°C for 9 min under a pressure of 15 MPa. The product was discharged to obtain the outer sheath material.

[0043] The method for preparing the modified nano zinc oxide comprises the following steps:

[0044] The isocyanate group zinc oxide was prepared by adding 20 g of nano zinc oxide powder into 200 mL of ethyl acetate, ultrasonic dispersion, then adding 4.8 g of isocyanate group propyl triethoxysilane, and reacting at 50°C for 3 h. The solid was collected by filtration, washed and dried. The 4-propenyloxy-2-hydroxybenzophenone modified zinc oxide was prepared by adding 12.5 g of the isocyanate group zinc oxide into 200 mL of toluene, adding 10 g of 4-propenyloxy-2-hydroxybenzophenone, 2 g of stannous octoate, and stirring and heating at 60°C for 2 h. After the reaction was completed, the solid was collected, washed and dried to obtain the solid product. The solid product was added into 200 mL of N,N-dimethylformamide, mixed uniformly, 10 g of 2,4,6-triallyloxy-1,3,5-triazine and 4 g of ammonium persulfate were added, and the mixture was heated at 80°C for 4 h. After the reaction was completed, the solid product was collected, washed and dried to obtain the modified nano zinc oxide.

[0045] Example 3

[0046] A method for preparing an outer sheath material, comprising 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 tetraethyl thiuram disulfide, 4 g of calcium stearate, 2 g of p-phenylenediamine, 15 g of triphenyl phosphate into the internal mixer and mix, the mixing temperature is 95℃, the mixing time is 15 min, the glue is discharged, the sheet is discharged, and then transferred to a flat vulcanizing machine, 2.5 g of dicumyl peroxide is added, and vulcanization molding is carried out, the vulcanization temperature is 160℃, the vulcanization time is 12 min, the pressure is 10 MPa, and the material is discharged to obtain the outer sheath material.

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

[0049] Put 25 g of nano zinc oxide powder into 200 mL of ethyl acetate, ultrasonic dispersion, then add 6 g of isocyanate propyl triethoxysilane, react at 50℃ for 3 h, filter and collect the solid, wash and dry to obtain isocyanate zinc oxide; Put 13 g of isocyanate zinc oxide into 200 mL of toluene, add 10 g of 4-propyleneoxy-2-hydroxybenzophenone, 3 g of stannous octoate, and heat and stir at 60℃ for 2 h. After the reaction is completed, the solid is collected, washed and dried to obtain the solid product. The solid product is added to 200 mL of N,N-dimethylformamide and mixed uniformly, 12 g of 2,4,6-triallyloxy-1,3,5-triazine and 5 g of ammonium persulfate are added, and the reaction is heated at 80℃ for 4 h. After the reaction is completed, the solid product is collected, washed and dried to obtain the modified nano zinc oxide.

[0050] Comparative Example 1

[0051] A preparation method of an outer sheath material, similar to Example 1, differs in that 2,4,6-triallyloxy-1,3,5-triazine is not added in the modified nano zinc oxide, and specifically comprises the following steps:

[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 the internal mixer and mix, the mixing temperature is 90℃, the mixing time is 12 min, the glue is discharged, the sheet is discharged, and then transferred to a flat vulcanizing machine, 2.5 g of dicumyl peroxide is added, and vulcanization molding is carried out, the vulcanization temperature is 150℃, the vulcanization time is 10 min, the pressure is 12 MPa, and the material is discharged to obtain the outer sheath material.

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

[0054] Into 200 mL of ethyl acetate, 20 g of nano-zinc oxide powder was added, after ultrasonic dispersion, 4.8 g of isocyanate propyl triethoxysilane was added, and the reaction was carried out at 50°C for 3 h. The solid was collected by filtration, washed and dried to obtain isocyanate zinc oxide. Into 200 mL of toluene, 12.5 g of isocyanate zinc oxide was added, 10 g of 4-propenyloxy-2-hydroxybenzophenone, 2 g of stannous octoate was added, and the reaction was carried out at 60°C for 2 h. After the reaction was completed, the solid was collected, washed and dried to obtain the solid product, which was the modified nano-zinc oxide.

[0055] Comparative Example 2

[0056] A method for preparing an outer sheath material, 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 comprising the following steps:

[0057] Into a mixer, 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-butyl phenol, and 10 g of triphenyl phosphate were mixed at a mixing temperature of 90°C for 12 min. The gum was discharged, and the sheet was transferred to a flat vulcanizing machine. 2.5 g of dicumyl peroxide was added, and vulcanization was carried out at a temperature of 150°C for 10 min under a pressure of 12 MPa. The material was discharged to obtain the outer sheath material.

[0058] The method for preparing the modified nano-zinc oxide comprises mixing 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 uniformly.

[0059] Comparative Example 3

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

[0061] 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-butyl phenol, 10g of triphenyl phosphate were put into a mixer and mixed, the mixing temperature was 90℃, the mixing time was 12min, the glue was discharged, the sheet was discharged, and then transferred to a flat vulcanizing machine, 2.5g of dicumyl peroxide was added, and vulcanization molding was carried out, the vulcanization temperature was 150℃, the vulcanization time was 10min, the pressure was 12MPa, and the material was discharged to obtain the outer sheath material.

[0062] The preparation method of the modified nano-zinc oxide is that 12.5g of isocyanate-based zinc oxide is uniformly mixed and stirred with 10g of 2,4,6-triallyloxy-1,3,5-triazine.

[0063] Application example

[0064] An aging-resistant bus control cable, a sectional view of which is shown in Figure 1 The preparation method is that 45 tin-plated soft copper wires are twisted into a strand, arranged and twisted according to a center strand and eight outer strands, tightly pressed to obtain a conductor 1, tightly wrapped with ethylene-propylene rubber insulation material to obtain an insulated wire core, and then twisted into a pair to obtain a twisted pair group; the twisted pair group is filled with polyolefin porous filler and then coated with a copper braid to obtain a cable core; the copper braid is coated with, from the inside to the outside, a common polyvinyl chloride inner sheath layer, a steel spiral winding belt armor layer 6, and the outer sheath material layer 7 prepared in Example 1.

[0065] Performance test

[0066] The tensile strength and elongation at break of the outer sheath materials of Examples 1-3 and Comparative Examples 1-3 were determined according to GB / T 2951-2008 General Test Methods for Cable and Optical Cable Insulation and Sheath Materials; the tensile strength retention rate after ultraviolet aging was determined according to GB / T 16585-1996 Artificial Weathering of Vulcanized Rubber (Fluorescent UV Lamp) Test Method; and the test results are shown in Table 1.

[0067] Table 1 Performance test results of outer sheath materials

[0068]

[0069] From the experimental results in Table 1, it can be seen that the outer sheath material prepared by the present application has good aging resistance and mechanical properties.

[0070] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the patent protection scope of the present application.

Claims

1. An aging-resistant bus control cable, characterized in that: The invention comprises 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 wire core, and then two insulated wire cores are twisted to obtain a twisted pair group; the two twisted pairs are filled with the filling layer (3) and then covered with the shielding layer (4) to obtain a cable core, and the outer side of the cable core is sequentially covered with the inner sheath layer (5), the armor layer (6) and the outer sheath layer (7) from the inside to the outside. layer (6) and an outer sheath layer (7); the outer sheath layer (7) is made of an outer sheath material, and the outer sheath material, in parts by weight, comprises 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 vulcanizing aid, 2-4 parts of activator, 0.5-2 parts of antioxidant, and 5-15 parts of flame retardant; The preparation method of the modified nano zinc oxide is as follows: Nano zinc oxide powder is added to ethyl acetate, and after ultrasonic dispersion, isocyanate propyl triethoxysilane is added to react to obtain isocyanate zinc oxide; isocyanate zinc oxide is added to toluene, 4-propyleneoxy-2-hydroxybenzophenone and stannous octoate are added, and the mixture is stirred for reaction. After the reaction is completed, a solid product is obtained, and the solid product is added to N,N-dimethylformamide and mixed evenly. 2,4,6-triallyloxy-1,3,5-triazine and an initiator are added, and the mixture is heated for reaction. After the reaction is completed, the solid product is collected, washed, and dried to obtain modified nano zinc oxide.

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

3. The aging-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 aging-resistant bus control cable according to claim 1, characterized in that: The mass ratio of the nano zinc oxide to isocyanate propyl triethoxysilane is 15-25:3-6.

5. The aging-resistant bus control cable according to claim 1, characterized in that: The mass ratio of the isocyanate zinc oxide, 4-propyleneoxy-2-hydroxybenzophenone, stannous octoate, 2,4,6-triallyloxy-1,3,5-triazine and initiator is 1.2-1.3:1:0.1-0.30.8-1.2:0.3-0.

5.

6. The aging-resistant bus control cable according to claim 1, characterized in that: The stirring reaction temperature is 50-80°C, and the reaction time is 1-3 hours; the heating reaction temperature is 70-90°C, and the reaction time is 3-5 hours.

7. The aging-resistant 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-benzothiazolesulfenamide.

8. The aging-resistant bus control cable according to claim 1, characterized in that: The flame retardant is triphenyl phosphate.

9. The aging-resistant bus control cable according to claim 1, characterized in that: The method for preparing the outer sheath material comprises the following steps: Styrene-butadiene rubber, natural rubber, modified nano zinc oxide, ethylene-octene copolymer, vulcanization aid, activator, antioxidant and flame retardant are put into an internal mixer for mixing, rubber removal and sheeting, and then transferred to a flat vulcanizing press, vulcanizing agent is added, vulcanization molding is carried out, and the outer sheath material is obtained by discharging.

Images