Wear-resistant tensile cable and preparation method thereof

Abstract

The invention relates to the technical field of cables, and provides a wear-resistant tensile cable and a preparation method thereof. The wear-resistant tensile cable comprises a conductor layer and a sheath layer coating the surface of the conductor layer, the sheath layer is prepared from the following raw materials in parts by weight: 50-55 parts of nitrile rubber, 8-10 parts of polystyrene-polybutadiene-polystyrene, 15-20 parts of polyurethane, 20-24 parts of modified nano titanium dioxide, 10-12 parts of composite cellulose reinforced master batch, 5-8 parts of glass fiber, 3-5 parts of a silane coupling agent, 3-4 parts of a composite flame retardant, 0.2-0.3 part of an ultraviolet light absorber and 1.2-1.5 parts of a cross-linking agent. According to the wear-resistant tensile cable prepared in the invention, the wear resistance and tensile resistance of the cable are enhanced, and the cable also has certain aging resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a wear-resistant and stretch-resistant cable and a preparation method thereof. Background Art

[0002] Wear-resistant and stretch-resistant cables, as an indispensable part of modern industry and daily life, are widely used in various occasions that require frequent movement, bending and external force. This type of cable is not only required to have excellent electrical properties, but also to perform well in mechanical strength, wear resistance, and stretch resistance. They are often used in car charging cables, mechanical equipment connection cables, robot arm internal circuits, and various electrical connection systems that require high flexibility and durability.

[0003] Although the existing wear-resistant and stretch-resistant cables have met the needs of the market to a certain extent, there are still many deficiencies in practical applications. On the one hand, some cables perform poorly in terms of wear resistance. During long-term use or frequent movement, the protective cover is easily worn, resulting in the exposure of the insulation layer, which increases the potential electrical safety hazards. On the other hand, some cables are lacking in tensile resistance. Excessive stretching may cause the conductor to break or the internal structure to be damaged, affecting the normal use of the cable. In addition, many solutions rely on the modification of a single material, and the problem of weak material interface bonding is not solved, resulting in easy delamination of the cable sheath, and easy powdering and falling off after long-term use. In order to solve the above-mentioned technical problems, the present invention proposes a new wear-resistant and stretch-resistant cable. Summary of the invention

[0004] The present invention provides a wear-resistant and stretch-resistant cable and a preparation method thereof, which enhances the wear resistance and stretch resistance of the cable and also has certain anti-aging properties.

[0005] The technical solution of the present invention is as follows: In the first aspect, the present invention proposes a wear-resistant and tensile-resistant cable, comprising a conductor layer and a sheath layer coated on the surface of the conductor layer, wherein the sheath layer is composed of the following raw materials in parts by weight: 50-55 parts of nitrile rubber, 8-10 parts of polystyrene-polybutadiene-polystyrene, 15-20 parts of polyurethane, 20-24 parts of modified nano titanium dioxide, 10-12 parts of composite cellulose reinforced masterbatch, 5-8 parts of glass fiber, 3-5 parts of silane coupling agent, 3-4 parts of composite flame retardant, 0.2-0.3 parts of ultraviolet absorber, and 1.2-1.5 parts of cross-linking agent.

[0006] As a further technical solution, the preparation method of the modified nano titanium dioxide comprises: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2000-2200 r / min and 110-120° C. for 10-20 min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 30-40 min, and then drying at 80-90° C. to obtain the modified nano titanium dioxide.

[0007] As a further technical solution, the usage ratio of the nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g: 1-3g: 1-2g: 180-200mL: 20-30mL.

[0008] As a further technical solution, the preparation method of the composite cellulose reinforced masterbatch includes: first, pre-treating the microcrystalline cellulose with alkali solution to obtain pre-treated microcrystalline cellulose, and activating the carbon fiber with nitric acid to obtain activated carbon fiber; adding the pre-treated microcrystalline cellulose, the activated carbon fiber and the maleic anhydride grafted polypropylene into a twin-screw extruder, controlling the screw speed to 280-300r / min, the vacuum degree to -0.08MPa, and shearing and dispersing at a temperature of 180-200°C and then pelletizing to obtain the masterbatch.

[0009] As a further technical solution, the weight ratio of the pretreated microcrystalline cellulose, the activated carbon fiber and the maleic anhydride grafted polypropylene is 65-75:20-30:4-6.

[0010] As a further technical solution, the pretreatment step includes: soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 55-65°C and a mass concentration of 5-10% for 100-120 minutes, washing with water until neutral, drying and crushing to an average length of 10-12 μm to obtain pretreated microcrystalline cellulose.

[0011] As a further technical solution, the activation step includes: immersing short-cut carbon fibers with an average length of 3-4 mm in nitric acid at 60-70° C. for 3-4 hours, washing with water until neutral, and drying at 100-120° C. to obtain activated carbon fibers.

[0012] As a further technical solution, the average diameter of the glass fiber is 10 μm and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant includes ammonium polyphosphate and antimony trioxide in a ratio of 1:2-3, the ultraviolet absorber is ultraviolet absorber UV-360; and the cross-linking agent is diisopropylbenzene peroxide.

[0013] In the second aspect, the present invention proposes a method for preparing a wear-resistant and tensile-resistant cable, the steps comprising: premixing nitrile rubber, polystyrene-polybutadiene-polystyrene, and polyurethane in an internal mixer to form a homogeneous matrix; subsequently adding modified nano titanium dioxide, composite cellulose masterbatch, and glass fiber, and simultaneously injecting a silane coupling agent for mixing; adding a cross-linking agent and a accelerator to continue mixing and vulcanizing; using a twin-screw extruder, setting the die head temperature to 160-170°C, controlling the extrusion rate to 2-3m / min, and simultaneously coating the conductor layer to obtain.

[0014] As a further technical solution, the premixing temperature is 80-90°C, the rotation speed is 40-50r / min, and the time is 5-7min; the mixing temperature is 110-120°C, and the time is 8-10min; the vulcanization temperature is 140-150°C, the pressure is 6-8MPa, and the time is 13-15min.

[0015] The working principle and beneficial effects of the present invention are: In the present invention, nitrile rubber is selected as the base material because of its excellent oil resistance and wear resistance, while the addition of polystyrene-polybutadiene-polystyrene (SBS) and polyurethane further enhances the elasticity and toughness of the material. The modified nano titanium dioxide is treated with a titanate coupling agent and a silane coupling agent, which not only improves its dispersibility and compatibility in the rubber matrix, but also significantly enhances the wear resistance of the material. The hardness and wear resistance of nano titanium dioxide enable it to effectively resist external wear and extend the service life of the cable. Among them, the modified nano titanium dioxide significantly enhances the wear resistance and hardness of the cable by improving its dispersibility and compatibility in the rubber matrix. Its nano-scale size effect makes the surface of the material smoother, reduces the friction area with the outside world, and thus reduces the wear rate. At the same time, the high hardness and high wear resistance of nano titanium dioxide also enable the cable to maintain good surface integrity when it is worn. In addition, the composite cellulose reinforced masterbatch forms a high-strength and high-modulus reinforcement system through the compounding of microcrystalline cellulose and carbon fiber. The good dispersibility of microcrystalline cellulose and the high strength and high modulus of carbon fiber enable the cable to effectively disperse stress and prevent breakage when stretched. The compatibilization effect of maleic anhydride grafted polypropylene also improves the compatibility of composite cellulose reinforced masterbatch with rubber matrix, further enhancing the tensile resistance of the cable.

[0016] The composite cellulose reinforced masterbatch of the present invention is combined with the compatibilization effect of maleic anhydride grafted polypropylene through the compound of microcrystalline cellulose and carbon fiber, and forms a high-strength, high-modulus reinforcement system, wherein microcrystalline cellulose provides a certain rigid support, and carbon fiber has extremely high strength and modulus, and the synergistic effect of the two enhances the internal structure of the cable material, greatly improving the tensile resistance of the cable. And the high strength and modulus of carbon fiber and the good dispersibility of microcrystalline cellulose enable the cable to effectively disperse stress when stretched and prevent fracture. At the same time, the addition of glass fiber further enhances the tensile resistance of the cable, and its high modulus characteristics enable the cable to maintain good shape stability during the stretching process. In addition, the modified nano titanium dioxide and the polymer matrix form a certain chemical bond or physical adsorption through the effects of silane coupling agents, etc., which enhances the interfacial bonding force, so that when the material is subjected to a tensile force, the stress can be transmitted more evenly, avoiding the material damage caused by local stress concentration, thereby improving the tensile resistance of the cable.

[0017] The modified nano titanium dioxide in the present invention has good photocatalytic performance and ultraviolet shielding effect, can absorb and scatter ultraviolet rays, prevent ultraviolet rays from damaging the molecular structure of cable materials, and thus delay the aging process of the materials. In addition, the further improvement of aging resistance also depends on the synergistic effect of ultraviolet absorbers and composite flame retardants. Ultraviolet absorber UV-360 can effectively absorb and convert ultraviolet energy to prevent cable materials from aging due to ultraviolet radiation. Ammonium polyphosphate and antimony trioxide in the composite flame retardant can form a stable carbon layer at high temperature, isolate oxygen and heat, and prevent the cable from aging rapidly due to fire. In addition, the introduction of silane coupling agent KH550 also improves the overall weather resistance and stability of the cable material.

[0018] In summary, the modified nano-titanium dioxide and the composite cellulose reinforced masterbatch have a synergistic effect in improving the performance of the cable after compounding. In terms of wear resistance, the modified nano-titanium dioxide improves the surface properties of the material, and the composite cellulose reinforced masterbatch improves the overall hardness and rigidity of the material. The two work together to greatly improve the wear resistance of the cable. In terms of tensile resistance, the modified nano-titanium dioxide enhances the interfacial bonding force, and the composite cellulose reinforced masterbatch provides a high-strength reinforced skeleton. Under the joint action, the cable can withstand greater tensile force and the tensile resistance is significantly enhanced. In terms of aging resistance, the photocatalytic and UV shielding effects of the modified nano-titanium dioxide are combined with the structural stabilization effect of the composite cellulose reinforced masterbatch to fully resist the damage of UV rays, oxidation and other aging factors to the cable material, greatly extending the service life of the cable. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that the model of the nitrile rubber in the present invention is JSR N240S; the model of the polystyrene-polybutadiene-polystyrene is Baling Petrochemical YH-791; the model of the polyurethane is Elastollan 1185A; the model of the microcrystalline cellulose is Avicel PH-102; the model of the carbon fiber is Toray T300; and the model of the maleic anhydride grafted polypropylene is Fusabond M613-05.

[0021] Example 1 The present embodiment provides a wear-resistant and tensile-resistant cable, comprising a conductor layer and a sheath layer coated on the surface of the conductor layer, the sheath layer is composed of the following raw materials in parts by weight: 52 parts of nitrile rubber, 9 parts of polystyrene-polybutadiene-polystyrene, 17 parts of polyurethane, 22 parts of modified nano titanium dioxide, 11 parts of composite cellulose reinforced masterbatch, 6 parts of glass fiber, 4 parts of silane coupling agent, 3.5 parts of composite flame retardant, 0.25 parts of ultraviolet absorber, and 1.3 parts of cross-linking agent.

[0022] Among them, the preparation method of modified nano titanium dioxide includes: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2100r / min and 115°C for 15min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 35min, and then drying at 85°C to obtain the product; the dosage ratio of nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g:2g:1.5g:190mL:25mL.

[0023] The preparation method of the composite cellulose reinforced masterbatch includes: firstly, soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 60°C and a mass concentration of 7% for 110 minutes, washing with water until neutral, drying and crushing to an average length of 11 μm to obtain pretreated microcrystalline cellulose; immersing short-cut carbon fibers with an average length of 3.5 mm in nitric acid at 65°C for 3.5 hours, washing with water until neutral, and drying at 110°C to obtain activated carbon fibers; adding the pretreated microcrystalline cellulose, activated carbon fibers and maleic anhydride grafted polypropylene in a weight ratio of 70:25:5 into a twin-screw extruder, controlling the screw speed to 290 r / min and the vacuum degree to -0.08 MPa, and shearing and dispersing at a temperature of 190°C and then pelletizing to obtain the obtained product; The average diameter of the glass fiber is 10 μm, and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant includes ammonium polyphosphate and antimony trioxide in a ratio of 1:2.5; the ultraviolet absorber is ultraviolet absorber UV-360; and the cross-linking agent is diisopropylbenzene peroxide.

[0024] The preparation method of the wear-resistant and tensile-resistant cable comprises the following steps: premixing nitrile rubber, polystyrene-polybutadiene-polystyrene and polyurethane in an internal mixer to form a homogeneous matrix; the premixing temperature is 85°C, the rotation speed is 45 r / min and the time is 6 min; then adding modified nano titanium dioxide, composite cellulose masterbatch and glass fiber, and simultaneously injecting a silane coupling agent for mixing; the mixing temperature is 115°C and the time is 9 min; adding a crosslinking agent and an accelerator to continue mixing and vulcanizing; the vulcanization temperature is 145°C, the pressure is 7 MPa and the time is 14 min; using a twin-screw extruder, setting the die head temperature to 165°C, controlling the extrusion rate to 2.5 m / min, and synchronously coating the conductor layer to obtain the cable.

[0025] Example 2 The present embodiment provides a wear-resistant and tensile-resistant cable, comprising a conductor layer and a sheath layer coated on the surface of the conductor layer, the sheath layer being composed of the following raw materials in parts by weight: 50 parts of nitrile rubber, 8 parts of polystyrene-polybutadiene-polystyrene, 15 parts of polyurethane, 20 parts of modified nano titanium dioxide, 10 parts of composite cellulose reinforced masterbatch, 5 parts of glass fiber, 3 parts of silane coupling agent, 3 parts of composite flame retardant, 0.2 parts of ultraviolet absorber, and 1.2 parts of cross-linking agent.

[0026] Among them, the preparation method of modified nano titanium dioxide includes: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2000r / min and 110°C for 10min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 30min, and then drying at 80°C to obtain; the dosage ratio of nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g:1g:1g:180mL:20mL.

[0027] The preparation method of the composite cellulose reinforced masterbatch includes: firstly, soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 55°C and a mass concentration of 5% for 100 minutes, washing with water to neutrality, drying and crushing to an average length of 10 μm to obtain pretreated microcrystalline cellulose; immersing short-cut carbon fibers with an average length of 3 mm in nitric acid at 60°C for 3 hours, washing with water to neutrality, and drying at 100°C to obtain activated carbon fibers; adding the pretreated microcrystalline cellulose, activated carbon fibers and maleic anhydride grafted polypropylene in a weight ratio of 65:20:4 into a twin-screw extruder, controlling the screw speed to 280 r / min and the vacuum degree to -0.08 MPa, and shearing and dispersing at a temperature of 180°C and then pelletizing to obtain the obtained product; The average diameter of the glass fiber is 10 μm, and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant includes ammonium polyphosphate and antimony trioxide in a ratio of 1:2, the ultraviolet absorber is ultraviolet absorber UV-360; and the cross-linking agent is diisopropylbenzene peroxide.

[0028] The preparation method of the wear-resistant and tensile-resistant cable comprises the following steps: premixing nitrile rubber, polystyrene-polybutadiene-polystyrene and polyurethane in an internal mixer to form a homogeneous matrix; the premixing temperature is 80°C, the rotation speed is 40r / min and the time is 5min; then adding modified nano titanium dioxide, composite cellulose masterbatch and glass fiber, and simultaneously injecting a silane coupling agent for mixing; the mixing temperature is 110°C and the time is 8min; adding a crosslinking agent and an accelerator to continue mixing and vulcanizing; the vulcanization temperature is 140°C, the pressure is 6MPa and the time is 13min; using a twin-screw extruder, setting the die head temperature to 160°C, controlling the extrusion rate to 2m / min, and synchronously coating the conductor layer to obtain the cable.

[0029] Example 3 The present embodiment provides a wear-resistant and tensile-resistant cable, comprising a conductor layer and a sheath layer coated on the surface of the conductor layer, the sheath layer being composed of the following raw materials in parts by weight: 55 parts of nitrile rubber, 10 parts of polystyrene-polybutadiene-polystyrene, 20 parts of polyurethane, 24 parts of modified nano titanium dioxide, 12 parts of composite cellulose reinforced masterbatch, 8 parts of glass fiber, 5 parts of silane coupling agent, 4 parts of composite flame retardant, 0.3 parts of ultraviolet absorber, and 1.5 parts of cross-linking agent.

[0030] Among them, the preparation method of modified nano titanium dioxide includes: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2200r / min and 120°C for 20min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 40min, and then drying at 90°C to obtain; the dosage ratio of nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g:3g:2g:200mL:30mL.

[0031] The preparation method of the composite cellulose reinforced masterbatch includes: firstly, soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 65°C and a mass concentration of 10% for 120 minutes, washing with water until neutral, drying and crushing to an average length of 12 μm to obtain pretreated microcrystalline cellulose; immersing short-cut carbon fibers with an average length of 4 mm in nitric acid at 70°C for 4 hours, washing with water until neutral, and drying at 120°C to obtain activated carbon fibers; adding the pretreated microcrystalline cellulose, activated carbon fibers and maleic anhydride grafted polypropylene in a weight ratio of 75:30:6 into a twin-screw extruder, controlling the screw speed to 300 r / min and the vacuum degree to -0.08 MPa, and shearing and dispersing at a temperature of 200°C and then pelletizing to obtain the masterbatch; The average diameter of the glass fiber is 10 μm, and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant includes ammonium polyphosphate and antimony trioxide in a ratio of 1:3; the ultraviolet absorber is ultraviolet absorber UV-360; and the cross-linking agent is diisopropylbenzene peroxide.

[0032] The preparation method of the wear-resistant and tensile-resistant cable comprises the following steps: premixing nitrile rubber, polystyrene-polybutadiene-polystyrene and polyurethane in an internal mixer to form a homogeneous matrix; the premixing temperature is 90°C, the rotation speed is 50r / min and the time is 7min; then adding modified nano titanium dioxide, composite cellulose masterbatch and glass fiber, and simultaneously injecting a silane coupling agent for mixing; the mixing temperature is 120°C and the time is 10min; adding a crosslinking agent and an accelerator to continue mixing and vulcanizing; the vulcanization temperature is 150°C, the pressure is 8MPa and the time is 15min; using a twin-screw extruder, setting the die head temperature to 170°C, controlling the extrusion rate to 3m / min, and synchronously coating the conductor layer to obtain the cable.

[0033] Example 4 The present embodiment provides a wear-resistant and tensile-resistant cable, including a conductor layer and a sheath layer coated on the surface of the conductor layer, the sheath layer is composed of the following raw materials in parts by weight: 50 parts of nitrile rubber, 10 parts of polystyrene-polybutadiene-polystyrene, 15 parts of polyurethane, 24 parts of modified nano titanium dioxide, 10 parts of composite cellulose reinforced masterbatch, 8 parts of glass fiber, 3 parts of silane coupling agent, 4 parts of composite flame retardant, 0.2 parts of ultraviolet absorber, and 1.5 parts of cross-linking agent.

[0034] Among them, the preparation method of modified nano titanium dioxide includes: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2000r / min and 120°C for 10min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 40min, and then drying at 80°C to obtain; the dosage ratio of nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g:3g:1g:200mL:20mL.

[0035] The preparation method of the composite cellulose reinforced masterbatch includes: firstly, soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 65°C and a mass concentration of 5% for 120 minutes, washing with water until neutral, drying and crushing to an average length of 10 μm to obtain pretreated microcrystalline cellulose; immersing short-cut carbon fibers with an average length of 4 mm in nitric acid at 60°C for 4 hours, washing with water until neutral, and drying at 100°C to obtain activated carbon fibers; adding the pretreated microcrystalline cellulose, activated carbon fibers and maleic anhydride grafted polypropylene in a weight ratio of 75:20:6 into a twin-screw extruder, controlling the screw speed to 280 r / min, the vacuum degree to -0.08 MPa, shearing and dispersing at a temperature of 200°C, and then pelletizing to obtain the obtained product; The average diameter of the glass fiber is 10 μm, and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant includes ammonium polyphosphate and antimony trioxide in a ratio of 1:2, the ultraviolet absorber is ultraviolet absorber UV-360; and the cross-linking agent is diisopropylbenzene peroxide.

[0036] The preparation method of the wear-resistant and tensile-resistant cable comprises the following steps: premixing nitrile rubber, polystyrene-polybutadiene-polystyrene and polyurethane in an internal mixer to form a homogeneous matrix; the premixing temperature is 80°C, the rotation speed is 50 r / min and the time is 5 min; then adding modified nano titanium dioxide, composite cellulose masterbatch and glass fiber, and simultaneously injecting a silane coupling agent for mixing; the mixing temperature is 120°C and the time is 8 min; adding a crosslinking agent and an accelerator to continue mixing and vulcanizing; the vulcanization temperature is 150°C, the pressure is 6 MPa and the time is 15 min; using a twin-screw extruder, setting the die head temperature to 160°C, controlling the extrusion rate to 3 m / min, and synchronously coating the conductor layer to obtain the cable.

[0037] Comparative Example 1 Adjustments were made on the basis of Example 1, except that the modified nano titanium dioxide was not further modified by the silane coupling agent KH550.

[0038] The preparation method of modified nano titanium dioxide comprises: mixing 100g nano titanium dioxide and 2g titanate coupling agent NDZ-201 at 2100r / min and 115°C for 15min to form titanate-coated nano titanium dioxide, namely modified nano titanium dioxide.

[0039] Comparative Example 2 Adjustments were made on the basis of Example 1, except that the modified nano titanium dioxide was not coated with a titanate coupling agent.

[0040] The preparation method of modified nano titanium dioxide comprises: dissolving silane coupling agent KH550 in a mixture of ethanol and water, adding nano titanium dioxide, ultrasonically dispersing for 35 minutes, and then drying at 85°C; the dosage ratio of nano titanium dioxide, silane coupling agent KH550, ethanol and water is 100g:1.5g:190mL:25mL.

[0041] Comparative Example 3 Adjustments were made on the basis of Example 1, except that the modified nano titanium dioxide was replaced by nano titanium dioxide without modification.

[0042] Comparative Example 4 Adjustments were made on the basis of Example 1. The difference from Example 1 was that the composite cellulose reinforced masterbatch was replaced with pretreated microcrystalline cellulose. The preparation steps included: soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 60°C and a mass concentration of 7% for 110 minutes, washing with water until neutral, and drying and crushing to an average length of 11 μm to obtain the pretreated microcrystalline cellulose.

[0043] Comparative Example 5 Adjustments were made on the basis of Example 1. The difference from Example 1 was that the composite cellulose reinforced masterbatch was replaced with activated carbon fiber. The preparation steps included: immersing short-cut carbon fiber with an average length of 3.5 mm in nitric acid at 65°C for 3.5 hours, washing with water until neutral, and drying at 110°C to obtain activated carbon fiber.

[0044] Comparative Example 6 Adjustments were made on the basis of Example 1. The difference from Example 1 was that the composite cellulose reinforced masterbatch was not prefabricated, and the composite cellulose reinforced masterbatch in the cable raw material was directly replaced with a composite material of pretreated microcrystalline cellulose, activated carbon fiber and maleic anhydride grafted polypropylene in a weight ratio of 70:25:5.

[0045] Test Example 1: The wear-resistant and tensile-resistant cables prepared in the above-mentioned Examples 1-4 and Comparative Examples 1-6 were subjected to the following tests: 1. Tensile strength: Use a universal material testing machine with a clamp spacing of 50 mm and a tensile speed of 300 mm / min. Record the maximum tensile force when the sample breaks and the tensile strength (N / mm 2 ) = maximum tensile force (N) / sample cross-sectional area (mm 2 ); 2. Wear resistance: Test according to IEC 60245. Fix the cable sample on a grinding wheel wear tester, apply a pressure of 10N, rub 1000 times at 40r / min, and measure the wear amount on the cable surface. 3. Heat aging resistance: Test according to GB / T 2951.12-2008, place the sample in a 135℃ oven for 168 hours, test the tensile strength after aging, and calculate the tensile strength maintenance rate; 4. UV aging resistance: Refer to ASTM D5374-93 for testing, use a UV aging box to simulate 720 hours of UV exposure, test the tensile strength after aging, and calculate the maintenance rate of tensile strength.

[0046] The test results are shown in Table 1 below: Table 1

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wear-resistant and tensile-resistant cable, characterized in that: The invention comprises a conductor layer and a sheath layer coated on the surface of the conductor layer, wherein the sheath layer is composed of the following raw materials in parts by weight: 50-55 parts of nitrile rubber, 8-10 parts of polystyrene-polybutadiene-polystyrene, 15-20 parts of polyurethane, 20-24 parts of modified nano titanium dioxide, 10-12 parts of composite cellulose reinforced masterbatch, 5-8 parts of glass fiber, 3-5 parts of silane coupling agent, 3-4 parts of composite flame retardant, 0.2-0.3 parts of ultraviolet absorber and 1.2-1.5 parts of crosslinking agent.

2. A wear-resistant and tensile-resistant cable according to claim 1, characterized in that: The preparation method of the modified nano titanium dioxide comprises: mixing nano titanium dioxide and titanate coupling agent NDZ-201 at a high speed of 2000-2200 r / min and 110-120° C. for 10-20 min to form titanate-coated nano titanium dioxide, dissolving silane coupling agent KH550 in a mixed solution of ethanol and water, adding titanate-coated nano titanium dioxide, ultrasonically dispersing for 30-40 min, and then drying at 80-90° C. to obtain the modified nano titanium dioxide.

3. A wear-resistant and tensile-resistant cable according to claim 2, characterized in that: The dosage ratio of the nano titanium dioxide, titanate coupling agent NDZ-201, silane coupling agent KH550, ethanol and water is 100g: 1-3g: 1-2g: 180-200mL: 20-30mL.

4. The wear-resistant and tensile-resistant cable according to claim 1, characterized in that: The preparation method of the composite cellulose reinforced masterbatch comprises: firstly, pre-treating the microcrystalline cellulose with alkali solution to obtain pre-treated microcrystalline cellulose, and activating the carbon fiber with nitric acid to obtain activated carbon fiber; adding the pre-treated microcrystalline cellulose, the activated carbon fiber and maleic anhydride grafted polypropylene into a twin-screw extruder, controlling the screw speed to 280-300r / min, the vacuum degree to -0.08MPa, and shearing and dispersing at a temperature of 180-200°C and then pelletizing to obtain the composite cellulose reinforced masterbatch.

5. The wear-resistant and tensile-resistant cable according to claim 4, characterized in that: The weight ratio of the pretreated microcrystalline cellulose, the activated carbon fiber and the maleic anhydride grafted polypropylene is 65-75:20-30:4-6.

6. The wear-resistant and tensile-resistant cable according to claim 4, characterized in that: The pretreatment step comprises: soaking the microcrystalline cellulose in a NaOH aqueous solution with a temperature of 55-65° C. and a mass concentration of 5-10% for 100-120 minutes, washing with water until neutral, drying and crushing to an average length of 10-12 μm to obtain the pretreated microcrystalline cellulose.

7. The wear-resistant and tensile-resistant cable according to claim 6, characterized in that: The activation step comprises: immersing short-cut carbon fibers with an average length of 3-4 mm in nitric acid at 60-70° C. for 3-4 hours, washing with water until neutral, and drying at 100-120° C. to obtain activated carbon fibers.

8. The wear-resistant and tensile-resistant cable according to claim 1, characterized in that: The average diameter of the glass fiber is 10 μm, and the average length is 6 mm; the silane coupling agent is silane coupling agent KH550; the composite flame retardant comprises ammonium polyphosphate and antimony trioxide in a ratio of 1:2-3; the ultraviolet absorber is ultraviolet absorber UV-360; and the crosslinking agent is diisopropylbenzene peroxide.

9. A method for preparing a wear-resistant and tensile-resistant cable according to any one of claims 1 to 8, characterized in that the steps include: Premixing nitrile rubber, polystyrene-polybutadiene-polystyrene, and polyurethane in an internal mixer to form a homogeneous matrix; Subsequently, modified nano titanium dioxide, composite cellulose masterbatch and glass fiber are added, and silane coupling agent is injected simultaneously for mixing; crosslinking agent and accelerator are added for continued mixing and vulcanization; a twin-screw extruder is used, the die temperature is set to 160-170°C, the extrusion rate is controlled to 2-3m / min, and the conductor layer is simultaneously coated.

10. The method for preparing the wear-resistant and tensile-resistant cable according to claim 9, characterized in that: The premixing temperature is 80-90°C, the rotation speed is 40-50r / min, and the time is 5-7min; the mixing temperature is 110-120°C, and the time is 8-10min; the vulcanization temperature is 140-150°C, the pressure is 6-8MPa, and the time is 13-15min.

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