High-strength torsion-resistant cable material and method for producing same

Abstract

The application provides a high-strength torsion-resistant cable material and a preparation method thereof, and relates to the technical field of cable materials.The cable material comprises the following raw materials: 30-40 parts of polypropylene, 20-25 parts of high-density polyethylene, 5-10 parts of nitrogen-sulfur doped sodium alginate film, 1-1.5 parts of maleic anhydride grafted carbon spheres and 1-2 parts of polybutylene succinate.The cable material prepared by compounding polypropylene, high-density polyethylene, nitrogen-sulfur doped sodium alginate film, maleic anhydride grafted carbon spheres and polybutylene succinate has a rigid-flexible balance, excellent mechanical properties and excellent torsion resistance, reduces the risk of cracking, has good aging resistance, is particularly suitable for use in sling cables and has a good application prospect.

Description

Technical Field

[0001] This invention relates to the field of cable material technology, and in particular to a high-strength, torsion-resistant cable material and its preparation method. Background Technology

[0002] Suspension cables require repeated winding and unwinding. Given their dynamic usage, the cables used with them must possess high strength, high flexibility, and high torsional resistance. Traditional cable materials suffer from insufficient flexibility, torsional fatigue resistance, and impact resistance, making them prone to cracking or breakage under dynamic bending and torsional stress, resulting in poor mechanical properties. Furthermore, the filler in traditional cable materials has poor compatibility with the matrix, easily leading to defects at the interface, stress concentration, and reduced mechanical properties and service life.

[0003] Therefore, developing a high-strength, torsion-resistant cable material is of practical significance. Summary of the Invention

[0004] Therefore, this invention proposes a high-strength, torsion-resistant cable material and its preparation method.

[0005] The technical solution of this invention is implemented as follows: A high-strength, torsion-resistant cable material, characterized in that, by weight, it comprises the following raw materials: 30-40 parts polypropylene, 20-25 parts high-density polyethylene, 5-10 parts nitrogen-sulfur-doped sodium alginate film, 1-1.5 parts maleic anhydride-grafted carbon spheres, and 1-2 parts polybutylene succinate.

[0006] Polybutylene succinate (Polybutylene oxalate) is produced by esterification at 190°C for 1 hour under a nitrogen atmosphere using a succinic anhydride to oxalic acid molar ratio (S:O) of 0.80:0.20, an acid-to-alcohol ratio of 1:1.3, and zirconium acetylacetone as a catalyst. The reaction is followed by heating to 230°C, applying a vacuum to below 400 Pa, and reacting for another 4 hours. Polybutylene succinate exhibits good film-forming and adhesive properties, can be uniformly dispersed in materials, and enhances the adhesion between particles.

[0007] Furthermore, the preparation method of the nitrogen-sulfur-doped sodium alginate film includes: adding polydopamine, thiourea and crosslinking agent to sodium alginate solution, ultrasonic treatment, freeze drying to obtain sodium alginate film, and calcining under an inert atmosphere to obtain nitrogen-sulfur-doped sodium alginate film.

[0008] Furthermore, the mass ratio of the polydopamine, thiourea, crosslinking agent, and sodium alginate is 1-2:0.8-1.2:1-2:10; The crosslinking agent is ethylene glycol methacrylate and acrylic acid in a mass ratio of 1:1-2; The sodium alginate solution has a mass concentration of 5-10% and a pH of 5-6.

[0009] Furthermore, the calcination is carried out under a nitrogen atmosphere, with the temperature increased to 450-550°C at a heating rate of 3-5°C / min, and maintained for 1-2 hours.

[0010] Furthermore, the preparation method of the maleic anhydride-grafted carbon spheres includes: hydrothermally heating a glucose solution in a high-pressure reactor to form carbon spheres, etching the carbon spheres in a citric acid solution, adding the etched carbon spheres to anhydrous ethanol, adding maleic anhydride, stirring and mixing, filtering and washing to obtain maleic anhydride-grafted carbon spheres.

[0011] Furthermore, the glucose solution has a mass concentration of 25-35%; The hydrothermal temperature is 160-180℃, and the time is 3-5 hours.

[0012] Furthermore, the solid-liquid ratio of the carbon spheres to the citric acid solution is 1:10-20 g / mL, and the mass concentration of the citric acid solution is 8-12%. The etching temperature is 40-50℃ and the time is 40-60 minutes.

[0013] Furthermore, the solid-liquid ratio of the etched carbon spheres to anhydrous ethanol is 1:10-20 g / mL; The mass ratio of maleic anhydride to etched carbon spheres is 3-5:10; The stirring is carried out at 80-90℃ and 200-300rpm for 1-3 hours.

[0014] A method for preparing a high-strength, torsion-resistant cable material, characterized by the following specific steps: Nitrogen and sulfur-doped sodium alginate film is ultra-finely pulverized and mixed with maleic anhydride-grafted carbon balls at high speed. The mixture is then added to a mixer and mixed at 110-120℃ for 3-5 minutes. The discharged powder is cooled and passed through a 60-mesh sieve. It is then mixed with polypropylene and high-density polyethylene at medium speed and added to a mixer at 160-165℃ for 3-5 minutes. Polybutylene succinate is added and mixed at low speed. The mixture is then extruded and granulated using a twin-screw extruder.

[0015] Furthermore, the high-speed stirring is performed at 800-1000 rpm for 10-15 minutes; the medium-speed stirring is performed at 400-600 rpm for 10-20 minutes; and the low-speed stirring is performed at 100-200 rpm for 30-50 minutes.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The cable material prepared by polypropylene, high-density polyethylene, nitrogen-sulfur doped sodium alginate film, maleic anhydride grafted carbon spheres and polybutylene succinate oxalate has a balance of rigidity and toughness, high strength and excellent torsional resistance, reduces the risk of cracking, improves mechanical properties, and has good aging resistance. It is particularly suitable for suspension cables and has good application prospects.

[0017] 2. The nitrogen-sulfur-doped sodium alginate film of this invention is a graphite-like N,S co-doped porous carbon material obtained through ultrasonic-assisted in-situ polymerization and high-temperature carbonization. This improves surface roughness and interfacial bonding strength, alters surface polarity, and reduces interfacial tension, resulting in better compatibility with polypropylene and polyethylene. Maleic anhydride-grafted carbon spheres, synthesized hydrothermally, contain hydroxyl groups on their surface. Through etching and grafting maleic anhydride, these spheres react with the end groups of polypropylene and polyethylene, and also interact with the ester groups of polybutylene succinate (POS), uniformly dispersing within the matrix and increasing material strength. The nitrogen-sulfur-doped sodium alginate film and the maleic anhydride-grafted carbon spheres synergistically prevent rapid fracture under torsional stress, reducing stress and absorbing impact energy.

[0018] 3. The polybutylene succinate oxalate of the present invention can be uniformly dispersed in the material, enhancing the adhesion between particles. The terminal hydroxyl groups of the polybutylene succinate oxalate undergo esterification or amidation reactions with the oxygen- or nitrogen-containing functional groups on the surface of the nitrogen- and sulfur-doped sodium alginate film to form strong chemical bonds, ensuring effective stress transfer. Detailed Implementation

[0019] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0020] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0021] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0022] The polybutylene oxalate of the present invention is vacuum dried at 80°C for 10 hours before processing to control the water content to be less than 0.05%.

[0023] Preparation Example 1 The preparation method of nitrogen-sulfur-doped sodium alginate film includes: adding polydopamine, thiourea and crosslinking agent (ethylene glycol methacrylate and acrylic acid in a mass ratio of 1:1-2) to a 10wt% sodium alginate solution at pH 5-6, wherein the mass ratio of polydopamine, thiourea, crosslinking agent and sodium alginate is 1-2:0.8-1.2:1-2:10, ultrasonically treating at 25KHz, 300W and 35℃ for 1h, freeze-drying to obtain sodium alginate film, heating the sodium alginate film to 450-550℃ at a heating rate of 3-5℃ / min under a nitrogen atmosphere, maintaining for 1-2h, and cooling with the furnace to obtain nitrogen-sulfur-doped sodium alginate film.

[0024] Preparation Example 2 The preparation method of maleic anhydride-grafted carbon spheres includes: hydrothermating a 30wt% glucose solution in a high-pressure reactor at 180℃ for 5 hours to form carbon spheres; etching the carbon spheres in a 10wt% citric acid solution at 40-50℃ for 40-60 minutes at a solid-liquid ratio of 1:10-20 g / mL; adding the etched carbon spheres to anhydrous ethanol at a solid-liquid ratio of 1:10-20 g / mL; adding maleic anhydride; stirring at 80-90℃ and 200-300 rpm for 1-3 hours; the mass ratio of maleic anhydride to etched carbon spheres being 3:10; filtering and washing to obtain maleic anhydride-grafted carbon spheres.

[0025] Example 1 A high-strength, torsion-resistant cable material comprises, by weight, the following raw materials: 35 parts polypropylene, 23 parts high-density polyethylene, 8 parts nitrogen-sulfur-doped sodium alginate film, 1.3 parts maleic anhydride-grafted carbon spheres, and 1.5 parts polybutylene succinate oxalate.

[0026] The preparation method of the above-mentioned cable material includes: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and stirred with maleic anhydride-grafted carbon balls at 900 rpm for 13 min. The mixture was then added to a mixer and stirred at 115°C for 4 min. The discharged powder was cooled and passed through a 60-mesh sieve. It was then stirred with polypropylene and high-density polyethylene at 500 rpm for 15 min and added to a mixer and stirred at 163°C for 4 min. Polybutylene succinate was added and stirred at 150 rpm for 40 min. The mixture was then extruded and granulated using a twin-screw extruder.

[0027] Example 2 A high-strength, torsion-resistant cable material comprises, by weight, the following raw materials: 30 parts polypropylene, 20 parts high-density polyethylene, 5 parts nitrogen-sulfur-doped sodium alginate film, 1 part maleic anhydride-grafted carbon spheres, and 1 part polybutylene succinate oxalate.

[0028] The preparation method of the above-mentioned cable material includes: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and mixed with maleic anhydride-grafted carbon balls at 800 rpm for 10 min. The mixture was then added to a mixer and mixed at 110°C for 3 min. The discharged powder was cooled and passed through a 60-mesh sieve. It was then mixed with polypropylene and high-density polyethylene at 400 rpm for 10 min and added to a mixer and mixed at 160°C for 3 min. Polybutylene succinate was added and mixed at 100 rpm for 30 min. The mixture was then extruded and granulated using a twin-screw extruder.

[0029] Example 3 A high-strength, torsion-resistant cable material comprises, by weight, the following raw materials: 40 parts polypropylene, 25 parts high-density polyethylene, 10 parts nitrogen-sulfur-doped sodium alginate film, 1.5 parts maleic anhydride-grafted carbon spheres, and 2 parts polybutylene succinate.

[0030] The preparation method of the above-mentioned cable material includes: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and mixed with maleic anhydride-grafted carbon spheres at 1000 rpm for 15 min. The mixture was then added to a mixer and mixed at 120°C for 5 min. The discharged powder was cooled and passed through a 60-mesh sieve. It was then mixed with polypropylene and high-density polyethylene at 600 rpm for 20 min and added to a mixer and mixed at 165°C for 5 min. Polybutylene succinate was added and mixed at 200 rpm for 50 min. The mixture was then extruded and granulated using a twin-screw extruder.

[0031] Comparative Example 1 The difference from Example 1 is that the nitrogen-sulfur-doped sodium alginate film is missing; otherwise, it is the same as Example 1.

[0032] The cable material in this comparative example, by weight, includes the following raw materials: 35 parts polypropylene, 23 parts high-density polyethylene, 1.3 parts maleic anhydride-grafted carbon balls, and 1.5 parts polybutylene succinate.

[0033] The preparation method of the above-mentioned cable material includes: Maleic anhydride-grafted carbon balls, polypropylene, and high-density polyethylene were stirred at 500 rpm for 15 min, then added to a mixer and stirred at 160°C for 4 min. Polybutylene succinate was added and stirred at 200 rpm for 50 min. The mixture was then extruded and granulated using a twin-screw extruder.

[0034] Comparative Example 2 The difference from Example 1 is that maleic anhydride-grafted carbon spheres are replaced with styrene-maleic anhydride copolymer, otherwise the same as Example 1.

[0035] The cable material in this comparative example, by weight, includes the following raw materials: 35 parts polypropylene, 23 parts high-density polyethylene, 8 parts nitrogen-sulfur doped sodium alginate film, 1.3 parts styrene-maleic anhydride copolymer, and 1.5 parts polybutylene succinate.

[0036] The preparation method of the above-mentioned cable material includes: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and stirred with styrene-maleic anhydride copolymer at 900 rpm for 13 min. It was then added to a mixer and stirred at 115°C for 4 min. The discharged powder was cooled and passed through a 60-mesh sieve. It was then stirred with polypropylene and high-density polyethylene at 500 rpm for 15 min and added to a mixer at 163°C for 4 min. Polybutylene succinate was added and stirred at 150 rpm for 40 min. The mixture was then extruded and granulated using a twin-screw extruder.

[0037] Comparative Example 3 The difference from Example 1 is that polybutylene succinate is missing; otherwise, it is the same as Example 1.

[0038] The cable material in this comparative example, by weight, includes the following raw materials: 35 parts polypropylene, 23 parts high-density polyethylene, 8 parts nitrogen-sulfur doped sodium alginate film, and 1.3 parts maleic anhydride grafted carbon spheres.

[0039] The preparation method of the above-mentioned cable material includes: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and stirred with maleic anhydride-grafted carbon balls at 900 rpm for 13 min. The mixture was then added to a mixer and kneaded at 115°C for 4 min. The discharged powder was cooled and passed through a 60-mesh sieve. It was then stirred with polypropylene and high-density polyethylene at 500 rpm for 15 min and added to a mixer and kneaded at 170°C for 4 min. Finally, the mixture was extruded and granulated using a twin-screw extruder.

[0040] Test case The cable materials prepared in Examples 1-3 and Comparative Examples 1-3 were processed into cable sheaths using conventional processes, and their performance was tested. The test standards and test results are shown in Table 1.

[0041] Among them, cable sheath sampling involves cutting a sufficiently long sample from each tested cable or flexible wire sample or a sheath sample taken from the cable, to prepare at least 5 specimens for the tensile test before aging and the number of specimens required for the tensile test after aging as specified in the cable standard for sheath materials. Note that each specimen needs to be approximately 100 mm in length.

[0042] Table 1

[0043] As can be seen from Table 1, the cable sheaths prepared from the cable materials of Examples 1-3 of the present invention have good mechanical strength and excellent anti-torsion performance, which can meet the application of sling cables and extend the service life of the cables.

[0044] Based on the data from Comparative Examples 1-3, this invention comprehensively improves the overall mechanical properties of cable materials by combining nitrogen-sulfur doped sodium alginate film, maleic anhydride-grafted carbon spheres, and polybutylene oxalate.

[0045] The above description is only a preferred embodiment of the present invention and is 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 within the protection scope of the present invention.

Claims

1. A high-strength, torsion-resistant cable material, characterized in that, The raw materials, by weight, include: 30-40 parts polypropylene, 20-25 parts high-density polyethylene, 5-10 parts nitrogen-sulfur doped sodium alginate film, 1-1.5 parts maleic anhydride grafted carbon spheres, and 1-2 parts polybutylene succinate oxalate.

2. The high-strength, torsion-resistant cable material as described in claim 1, characterized in that, The method for preparing the nitrogen-sulfur-doped sodium alginate film includes: adding polydopamine, thiourea and a crosslinking agent to a sodium alginate solution, ultrasonic treatment, freeze drying to obtain a sodium alginate film, and calcining it under an inert atmosphere to obtain a nitrogen-sulfur-doped sodium alginate film.

3. The high-strength, torsion-resistant cable material as described in claim 2, characterized in that, The mass ratio of polydopamine, thiourea, crosslinking agent and sodium alginate is 1-2:0.8-1.2:1-2:10; The crosslinking agent is ethylene glycol methacrylate and acrylic acid in a mass ratio of 1:1-2; The sodium alginate solution has a mass concentration of 5-10% and a pH of 5-6.

4. The high-strength, torsion-resistant cable material as described in claim 2, characterized in that, The calcination is carried out under a nitrogen atmosphere, with the temperature increased to 450-550°C at a rate of 3-5°C / min, and maintained for 1-2 hours.

5. The high-strength, torsion-resistant cable material as described in claim 1, characterized in that, The method for preparing maleic anhydride-grafted carbon spheres includes: hydrothermally heating a glucose solution in a high-pressure reactor to form carbon spheres; etching the carbon spheres in a citric acid solution; adding the etched carbon spheres to anhydrous ethanol; adding maleic anhydride and stirring to mix; filtering and washing to obtain maleic anhydride-grafted carbon spheres.

6. The high-strength, torsion-resistant cable material as described in claim 5, characterized in that, The glucose solution has a mass concentration of 25-35%; The hydrothermal temperature is 160-180℃, and the time is 3-5 hours.

7. The high-strength, torsion-resistant cable material as described in claim 5, characterized in that, The solid-liquid ratio of the carbon spheres to the citric acid solution is 1:10-20 g / mL, and the mass concentration of the citric acid solution is 8-12%. The etching temperature is 40-50℃ and the time is 40-60 minutes.

8. The high-strength, torsion-resistant cable material as described in claim 5, characterized in that, The solid-liquid ratio of the etched carbon spheres to anhydrous ethanol is 1:10-20 g / mL; The mass ratio of maleic anhydride to the etched carbon spheres is 3-5:10; The stirring is carried out at 80-90℃ and 200-300rpm for 1-3 hours.

9. A method for preparing a high-strength, torsion-resistant cable material according to any one of claims 1-8, characterized in that, The specific steps include: Nitrogen-sulfur-doped sodium alginate film was ultra-finely pulverized and mixed with maleic anhydride-grafted carbon balls at high speed. The mixture was then added to a mixer and mixed at 110-120℃ for 3-5 minutes. The pulverized material was cooled and passed through a 60-mesh sieve. It was then mixed with polypropylene and high-density polyethylene at medium speed and added to a mixer at 160-165℃ for 3-5 minutes. Polybutylene succinate was added and mixed at low speed. The mixture was then extruded and granulated using a twin-screw extruder.

10. The method for preparing a high-strength, torsion-resistant cable material as described in claim 9, characterized in that, The high-speed stirring is carried out at 800-1000 rpm for 10-15 minutes; the medium-speed stirring is carried out at 400-600 rpm for 10-20 minutes; and the low-speed stirring is carried out at 100-200 rpm for 30-50 minutes.

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