Anti-tensile deformation mobile cable sheath material and preparation method thereof

Abstract

The invention relates to the field of cables, in particular to a tensile deformation resistant mobile cable sheath material and a preparation method thereof, which are used for solving the problem that the existing cable sheath material is easy to deform or crack when facing mechanical stretching or repeated bending. The toughness and rebound resilience of the material are improved by constructing a synergistic effect of a hydrogen bond physical cross-linked network and a structure enhanced network; a UPy group at the tail end of a molecular side chain of the toughening agent can form a strong dimer through quadruple hydrogen bonds, and a dynamic and physical secondary cross-linked network is formed in the material, so that irreversible slippage of a polymer molecular chain is effectively limited, the material is driven to rebound, and the permanent deformation resistance is improved; the prepared mobile cable sheath material has good permanent tensile deformation resistance and stable size, and under the working conditions of high-speed and high-frequency repeated bending, twisting and dragging, cracks are not prone to being generated on the surface of a sheath, and the internal structure is not prone to being damaged.

Description

Technical Field

[0001] This invention relates to the field of cables, specifically to a movable cable sheath material resistant to tensile deformation and its preparation method. Background Technology

[0002] With the increasing demand for electronic products and electrical equipment in modern society, the use of cables in various environmental conditions is becoming more and more widespread. In the cable industry, the design and preparation of cable sheath materials is an important technology. Protecting cables from the influence of the external environment and extending their service life is one of the important functions of cable sheath materials. Cable sheath is a material covering the outer layer of a cable. Its main function is to protect the internal wires from physical damage and environmental factors, ensuring that the cable can safely and reliably transmit power or signals.

[0003] Traditional cable sheath materials are usually made of elastic materials such as rubber or plastic. Although these materials can provide a certain degree of protection, they are relatively easy to deform or break when faced with mechanical tension or repeated bending. As a result, in some application scenarios, such as ships, vehicles or industrial equipment, when the cable is frequently moved, traditional cable sheath materials may fail, affecting the normal use of the cable.

[0004] Therefore, the tensile deformation resistant mobile cable sheath material and its preparation method of the present invention are of great significance for improving the reliability of cables and extending their service life. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a mobile cable sheath material resistant to tensile deformation and its preparation method, which solves the problem that existing cable sheath materials are prone to deformation or breakage when subjected to mechanical tension or repeated bending.

[0006] The objective of this invention can be achieved through the following technical solutions: In a first aspect, this application provides a mobile cable sheath material resistant to tensile deformation, comprising the following components in parts by weight: The mixture contains 40-70 parts of modified polyurethane elastomer, 3-10 parts of chopped aramid fiber, 10-25 parts of elastomer toughening agent, 5-8 parts of silane coupling agent, 0.5-1.5 parts of crosslinking agent, 1-3 parts of co-crosslinking agent, 2-6 parts of wear-resistant agent, 0.5-1.5 parts of antioxidant, 1-2 parts of ultraviolet absorber, and 1-2 parts of lubricant. The chopped aramid fiber is of type aramid 1414 and has a length of 3-5 mm; the silane coupling agent is KH-550; the crosslinking agent is dicumyl peroxide; the co-crosslinking agent is triallyl isocyanurate; the wear-resistant agent is one of molybdenum disulfide and graphite; the antioxidant is 1010; the ultraviolet absorber is UV-531; and the lubricant is calcium stearate.

[0007] In a preferred embodiment of the present invention, the modified polyurethane elastomer is prepared by the following steps: Step a1: Polyester diol, the first part of isophorone diisocyanate, dibutyltin dilaurate, and the first part of N,N-dimethylacetamide are added to a three-necked flask equipped with a stirrer and a thermometer. The mixture is stirred at 80°C for 3 hours to obtain a prepolymer. The temperature is lowered to 40°C, and the second part of isophorone diisocyanate is added to the prepolymer. The mixture is stirred for 30 minutes, and then adipic acid dihydrazide and the second part of N,N-dimethylacetamide are added. The mixture is stirred and reacted for 24 hours. The mixture is degassed in a vacuum oven, cured at 80°C for 24 hours, and then vacuum dried at 60°C for 48-72 hours to obtain an elastomer. Step a2: Add Ti3AlC2, LiF and ethanol solution to a three-necked flask equipped with a stirrer and thermometer, and ultrasonically disperse for 20-30 min. Transfer to a ball mill jar with a ball-to-material ratio of 3-5:1, and ball mill at 300-400 r / min for 6-9 h. Place in a vacuum drying oven at 60℃ and dry for 10-12 h. Add hydrochloric acid solution, purge with nitrogen for protection, and react in a water bath at 40℃ for 24 h. Use anhydrous ethanol as the washing liquid and centrifuge at 10000 r / min for 5-10 min. Transfer the precipitate to a vacuum drying oven at 80℃ and dry for 12 h to obtain the intermediate product. Step a3: Add 2,3-epoxypropyltrimethylammonium chloride, deionized water, and melamine to a three-necked flask equipped with a stirrer and thermometer. Mix and stir at 90°C in an oil bath for 12 hours. Filter at 25°C. Place the filtrate in a vacuum drying oven at 80°C and evaporate and concentrate for 3-5 minutes. Add n-butanol and mix and stir for 1 hour. Add anhydrous ethanol and ethyl acetate and mix and stir for 30 minutes. Allow to stand and separate into layers. Remove the supernatant and wash 2-3 times with the mixed solution. Add the intermediate product and ethanol solution and sonicate for 10-15 minutes. Mix and stir at 75°C for 3-4 hours. Centrifuge and remove the supernatant. Wash 2-3 times with distilled water and vacuum dry at 60°C for 3-6 hours to obtain the precursor. Step a4: Add the elastomer and the first part of N,N-dimethylformamide to a three-necked flask equipped with a stirrer and a thermometer, and mix and stir at 90°C for 4 hours to obtain a mother liquor; add the precursor and the second part of N,N-dimethylformamide to a beaker and ultrasonically disperse for 15 minutes, add the mother liquor, mix and stir at 90°C for 3 hours, pour into a mold, and dry at 60°C for 48-72 hours to obtain the modified polyurethane elastomer.

[0008] In a preferred embodiment of the present invention, the ratio of the total amount of polyester diol, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylacetamide, and adipate dihydrazide in step a1 is 8-10 mL: 2-2.5 mL: 0.5 mL: 60 mL: 0.8-1 g; the polyester diol is one of polycarbonate diol T5651 and polycaprolactone diol PCL1000; the first part of isophorone diisocyanate accounts for 2 / 3 of the total amount of isophorone diisocyanate; the second part of isophorone diisocyanate accounts for 1 / 3 of the total amount of isophorone diisocyanate; the first part of N,N-dimethylacetamide accounts for 1 / 10 of the total amount of N,N-dimethylacetamide; the second part of N,N-dimethylacetamide accounts for 9 / 10 of the total amount of N,N-dimethylacetamide.

[0009] In a preferred embodiment of the present invention, the ratio of Ti3AlC2, LiF, ethanol solution and hydrochloric acid solution used in step a2 is 1-2g: 1-2g: 20-30mL: 20-40mL; the mass fraction of the ethanol solution is 50%; and the concentration of the hydrochloric acid solution is 9mol / L.

[0010] In a preferred embodiment of the present invention, the ratio of 2,3-epoxypropyltrimethylammonium chloride, deionized water, melamine, n-butanol, anhydrous ethanol, ethyl acetate, intermediate product, and ethanol solution in step a3 is 13-15g:100-150mL:2-3g:80-100mL:200-300mL:50-80mL:1-2g:20-30mL; the mass fraction of the ethanol solution is 80%; and the mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:1.

[0011] In a preferred embodiment of the present invention, the ratio of the elastomer, the total amount of N,N-dimethylformamide, and the precursor in step a4 is 10-15g: 150-200mL: 0.5-1g; the first part of N,N-dimethylformamide accounts for 9 / 10 of the total amount of N,N-dimethylformamide; and the second part of N,N-dimethylformamide accounts for 1 / 10 of the total amount of N,N-dimethylformamide.

[0012] In a preferred embodiment of the present invention, the elastomer toughening agent is prepared by the following steps: Step b1: Add the polymer elastomer-olefin-styrene-olefin copolymer and chloroform to a three-necked flask equipped with a stirrer and thermometer, mix and stir in an ice-water bath at 0-5℃ for 30 min, add anhydrous SnCl4 and 1,4-dichloromethoxybutane, mix and stir for 6 h, filter, wash the filter cake 2-3 times with anhydrous methanol, add toluene, mix and stir for 1-2 h to obtain the mother liquor; add potassium acetate, tetrabutylammonium bromide and deionized water to a beaker, mix and stir for 30 min, add the above mother liquor, stir and react at 110℃ for 4 days, filter, wash the precipitate 2-3 times with anhydrous methanol, dry at 80℃ for 2-3 h to obtain the esterified copolymer; Step b2: Add the esterified copolymer and toluene to a three-necked flask equipped with a condenser and stir for 1-2 hours; add KOH, tetrabutylammonium bromide and deionized water to a beaker and stir for 1 hour, then add the mixture to the three-necked flask and stir at 60°C for 12 hours. Filter the mixture, wash the precipitate 2-3 times with anhydrous methanol, and dry at 50°C for 4-6 hours to obtain the hydroxylated copolymer. Step b3: Add the hydroxylated copolymer and chloroform to a three-necked flask equipped with a stirrer and thermometer, and mix and stir for 30 min; add 2-amino-4-hydroxy-6-methylpyrimidine, hexamethylene diisocyanate and pyridine to a beaker, purge with nitrogen for protection, stir and react at 100 °C for 16 h, add n-hexane, mix and stir for 30 min, filter, wash the precipitate 2-3 times with acetone, dry under vacuum at 60 °C for 48 h, add to the above three-necked flask, add dibutyltin dilaurate, react at 60 °C for 12 h, let stand for 6-8 h, and dry in a vacuum drying oven at 80 °C for 24 h to obtain the elastomer toughening agent.

[0013] In a preferred embodiment of the present invention, the ratio of the polymer elastomer-olefin-styrene-olefin copolymer, chloroform, anhydrous SnCl4, 1,4-dichloromethoxybutane, toluene, potassium acetate, tetrabutylammonium bromide, and deionized water in step b1 is 6-8g:200-250mL:3-5mL:8-10mL:200mL:15-20g:2-2.5g:30-50mL; the polymer elastomer-olefin-styrene-olefin copolymer is of type G1652.

[0014] In a preferred embodiment of the present invention, the ratio of the esterified copolymer, toluene, KOH, tetrabutylammonium bromide and deionized water in step b2 is 6-8g: 200-250mL: 4-6g: 1.5-2g: 10-20mL.

[0015] In a preferred embodiment of the present invention, the ratio of the hydroxylated copolymer, chloroform, 2-amino-4-hydroxy-6-methylpyrimidine, hexamethylene diisocyanate, pyridine, n-hexane, and dibutyltin dilaurate in step b3 is 4-5g: 80-100mL: 0.3-0.5g: 0.5-0.6mL: 0.02-0.05mL: 10-20mL: 1-1.5g.

[0016] Secondly, this application provides a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step 1: Weigh out the following components by weight: 40-70 parts modified polyurethane elastomer, 3-10 parts chopped aramid fiber, 10-25 parts elastomer toughening agent, 5-8 parts silane coupling agent, 0.5-1.5 parts crosslinking agent, 1-3 parts co-crosslinking agent, 2-6 parts wear-resistant agent, 0.5-1.5 parts antioxidant, 1-2 parts ultraviolet absorber, and 1-2 parts lubricant. Step 2: Mix and stir the chopped aramid fibers and silane coupling agent for 5-10 minutes, then vacuum dry at 80℃ for 4 hours for later use. Add the modified polyurethane elastomer, elastomer toughening agent, wear-resistant agent, antioxidant, UV absorber, and lubricant to a high-speed mixer and mix at 300-500 r / min for 5-10 minutes. Add the treated chopped aramid fibers and transfer to a mixer. Mix at 165-190℃ and 200-400 r / min for 5-8 minutes. Add the crosslinking agent and co-crosslinking agent through the side feed port at 140-150℃ and continue mixing for 2-3 minutes. Extrude the mixture, cool it in a water bath, and then pelletize it using a pelletizer. Vacuum dry at 80℃ for 4 hours to obtain a mobile cable sheath material resistant to tensile deformation.

[0017] The beneficial effects of this invention are: This invention discloses a mobile cable sheath material resistant to tensile deformation. The process involves mixing and drying chopped aramid fibers and a silane coupling agent, then preparing the mixture. Modified polyurethane elastomer, elastomer toughening agent, wear-resistant agent, antioxidant, UV absorber, and lubricant are added to a high-speed mixer and stirred. The treated chopped aramid fibers are then added, and the mixture is transferred to an internal mixer for intensive mixing. A crosslinking agent and a co-crosslinking agent are added through a side feed port, and the mixing continues. The mixture is then extruded, cooled in a water bath, pelletized, and vacuum dried to obtain the mobile cable sheath material resistant to tensile deformation. This prepared mobile cable sheath material exhibits excellent resistance to permanent tensile deformation, dimensional stability, and is less prone to surface cracking and internal structural damage under high-speed, high-frequency repeated bending, torsion, and dragging conditions. It can withstand a higher number of reciprocating motions and has a significantly extended dynamic fatigue life. It combines high rigidity and high toughness; the wear-resistant agent in the matrix acts as a solid lubricant, reducing the coefficient of friction and wear, resulting in a wear-resistant surface and a long service life.

[0018] In the preparation of a mobile cable sheath material resistant to tensile deformation, a modified polyurethane elastomer was first prepared. The terminal hydroxyl groups of polyester glycol reacted with the isocyanate groups of isophorone diisocyanate to obtain a prepolymer with terminal -NCO groups. The hydrazide groups of adipic acid dihydrazide reacted with the terminal -NCO groups of the prepolymer to form urea bonds and urethane bonds, achieving chain extension and crosslinking to obtain the elastomer. This elastomer provides a strong and tough "skeleton" and reversible physical crosslinking points. The dense hydrogen bond network formed by the urea bonds can break and dissipate energy under external force, and reorganize after the external force is removed, endowing the material with high initial strength, excellent resilience, and creep resistance. In an HCl / LiF solution, the Al layer of Ti3AlC2 was selectively etched away, and the weak interlayer bonds were destroyed, yielding an intermediate product. This intermediate product is a nanomaterial with a high specific surface area and a surface rich in negatively charged functional groups. In the matrix, it can effectively inhibit crack propagation and disperse stress. The surface functional groups... The amino groups provide active sites for subsequent modification; the amino groups of melamine attack the epoxy ring of 2,3-epoxypropyltrimethylammonium hydride, ring-opening to generate a melamine derivative with quaternary ammonium salt side chains. This cationic derivative is firmly grafted onto the intermediate product through electrostatic interactions and hydrogen bonding to obtain the precursor; the intermediate product with a layer of quaternary ammonium salt polymer on its surface changes from negative to positive charge, and its compatibility with the organic phase is improved; the precursor is uniformly dispersed in N,N-dimethylformamide, then mixed with an elastomer solution. After the solvent evaporates, the precursor is fixed in the three-dimensional network of polyurethane to obtain the modified polyurethane elastomer; this modified polyurethane elastomer solves the contradiction between strength, elasticity and durability of polyurethane elastomer through the synergistic effect of constructing a "hydrogen bond physical cross-linking network" and a "structural reinforcement network". This product has high strength and high toughness, high resilience and low permanent deformation, high wear resistance and excellent heat aging stability.

[0019] In the preparation of a mobile cable sheath material resistant to tensile deformation, an elastomer toughening agent was first prepared. Under anhydrous SnCl4 catalysis, 1,4-dichloromethoxybutane reacted with the benzene ring of the polystyrene block in the polymer elastomer-olefin-styrene-olefin copolymer molecular chain, introducing a chloromethyl group at the para-position of the benzene ring. The chloromethyl group reacted with potassium acetate, converting the chloromethyl group into acetate ester, yielding an esterified copolymer. Acetate ester side chains were grafted onto the styrene block of the original polymer elastomer-olefin-styrene-olefin copolymer molecular chain, introducing active sites for further reaction. Under the action of KOH, the acetate ester group underwent hydrolysis to generate a primary hydroxyl group, yielding a hydroxylated copolymer. The hydroxyl group is the active functional group for the next reaction with isocyanate, transforming the inert polymer elastomer-olefin-styrene-olefin copolymer into a reactive polymer. 2-Amino-4-hydroxy-6-methylpyrimidine reacted with hexamethylene diisocyanate to generate an UPy derivative with a -NCO terminal. The terminal -NCO group of UPy-NCO reacted with the -O group of the hydroxylated copolymer side chain. The H groups react under the action of a catalyst to form urethane bonds, covalently grafting UPy units onto the hydroxylated copolymer to obtain an elastomer toughening agent. The UPy groups at the end of the side chains of the toughening agent molecule can form strong dimers through quadruple hydrogen bonds. When the material is under stress, these hydrogen bonds can preferentially undergo reversible breakage. This process can absorb and dissipate a large amount of energy, thereby preventing the propagation of microcracks and passivating stress concentration points. When added to matrices such as polyurethane, it can significantly improve the impact resistance, tear resistance, and elongation at break of composite materials, making the material less prone to brittle fracture under destructive external forces. The UPy dimer forms a dynamic, physical secondary cross-linked network inside the material. This network can be temporarily "unlocked" under external forces and can be quickly "reassembled" after unloading, effectively limiting the irreversible slippage of polymer molecular chains, driving material rebound, and improving resistance to permanent deformation. Under dynamic stress, the "breakage-reassembly" cycle of UPy hydrogen bonds is an efficient and low-damage energy dissipation mechanism, continuously buffering and dissipating mechanical energy, thereby delaying the accumulation of fatigue damage. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram showing the tensile deformation test results of the mobile cable sheath material in Examples 1-3 and Comparative Examples 1-3 of the present invention.

[0022] Figure 2 This is a schematic diagram showing the tensile strength test results of the mobile cable sheath materials in Examples 1-3 and Comparative Examples 1-3 of the present invention.

[0023] Figure 3This is a schematic diagram showing the test results of the elongation at break of the mobile cable sheath material in Examples 1-3 and Comparative Examples 1-3 of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1:

[0026] This embodiment describes a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: Add 8 mL of polycarbonate diol T5651, 1.4 mL of isophorone diisocyanate, 0.5 mL of dibutyltin dilaurate, and 6 mL of N,N-dimethylacetamide to a three-necked flask equipped with a stirrer and thermometer. Mix and stir at 80°C for 3 h to obtain a prepolymer. Cool down to 40°C, add 0.6 mL of isocyanate to the prepolymer, mix and stir for 30 min, add 0.8 g of adipic acid dihydrazide and 54 mL of N,N-dimethylacetamide, stir and react for 24 h, degas in a vacuum oven, cure at 80°C for 24 h, and then vacuum dry at 60°C for 48 h to obtain an elastomer. Step S2: Add 1g Ti3AlC2, 1g LiF and 20mL of 50% ethanol solution to a three-necked flask equipped with a stirrer and thermometer. Disperse by ultrasonication for 20min. Transfer to a ball mill jar with a ball-to-material ratio of 3:1. Ball mill at 300r / min for 6h. Place in a vacuum drying oven at 60℃ and dry for 10h. Add 20mL of 9mol / L hydrochloric acid solution, purge with nitrogen for protection, and react in a water bath at 40℃ for 24h. Use anhydrous ethanol as the washing liquid and centrifuge at 10000r / min for 5min. Transfer the precipitate to a vacuum drying oven at 80℃ and dry for 12h to obtain the intermediate product. Step S3: Add 13g of 2,3-epoxypropyltrimethylammonium chloride, 100mL of deionized water, and 2g of melamine to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an oil bath at 90℃ for 12h. Filter at 25℃. Place the filtrate in a vacuum drying oven at 80℃ and evaporate and concentrate for 3min. Add 80mL of n-butanol and mix and stir for 1h. Add 200mL of anhydrous ethanol and 50mL of ethyl acetate and mix and stir for 30min. Allow to stand and separate into layers. Remove the supernatant and wash twice with the mixed solution. Add 1g of intermediate product and 20mL of 80% ethanol solution. Disperse by sonication for 10min. Mix and stir at 75℃ for 3h. Centrifuge to remove the supernatant. Wash twice with distilled water and vacuum dry at 60℃ for 3h to obtain the precursor. The mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:1. Step S4: Add 10g of elastomer and 135mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer and thermometer, and mix and stir at 90℃ for 4h to obtain a mother liquor; add 0.5g of precursor and 15mL of N,N-dimethylformamide to a beaker and ultrasonically disperse for 15min, add the mother liquor, mix and stir at 90℃ for 3h, pour into a mold, and dry at 60℃ for 48h to obtain the modified polyurethane elastomer; Step S5: Add 6g of polymer elastomer-olefin-styrene-olefin copolymer G1652 and 200mL of chloroform to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an ice-water bath at 0℃ for 30min. Add 3mL of anhydrous SnCl4 and 8mL of 1,4-dichloromethoxybutane. Mix and stir for 6h. Filter and wash the filter cake twice with anhydrous methanol. Add 200mL of toluene and mix and stir for 1h to obtain the mother liquor. Add 15g of potassium acetate, 2g of tetrabutylammonium bromide and 30mL of deionized water to a beaker and mix and stir for 30min. Add the above mother liquor and stir and react at 110℃ for 4d. Filter and wash the precipitate twice with anhydrous methanol. Dry at 80℃ for 2h to obtain the esterified copolymer. Step S6: Add 6g of the esterified copolymer and 200mL of toluene to a three-necked flask equipped with a condenser and stir for 1h; add 4g of KOH, 1.5g of tetrabutylammonium bromide and 10mL of deionized water to a beaker and stir for 1h, then add the mixture to the three-necked flask and stir at 60℃ for 12h. Filter the mixture, wash the precipitate twice with anhydrous methanol, and dry at 50℃ for 4h to obtain the hydroxylated copolymer. Step S7: Add 4g of hydroxylated copolymer and 80mL of chloroform to a three-necked flask equipped with a stirrer and thermometer, and mix and stir for 30min; add 0.3g of 2-amino-4-hydroxy-6-methylpyrimidine, 0.5mL of hexamethylene diisocyanate and 0.02mL of pyridine to a beaker, purge with nitrogen, stir and react at 100℃ for 16h, add 10mL of n-hexane, mix and stir for 30min, filter, wash the precipitate twice with acetone, vacuum dry at 60℃ for 48h, add to the above three-necked flask, add 1g of dibutyltin dilaurate, react at 60℃ for 12h, stand for 6h, and dry in a vacuum drying oven at 80℃ for 24h to obtain the elastomer toughening agent; Step S8: Weigh out 40 parts by weight of modified polyurethane elastomer, 3 parts by weight of chopped aramid fiber, 10 parts by weight of elastomer toughening agent, 5 parts by weight of silane coupling agent KH-550, 0.5 parts by weight of dicumyl peroxide, 1 part by weight of triallyl isocyanurate, 2 parts by weight of molybdenum disulfide, 0.5 parts by weight of antioxidant 1010, 1 part by weight of ultraviolet absorber UV-531, and 1 part by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 3 mm; Step S9: Mix and stir the chopped aramid fibers and silane coupling agent KH-550 for 5 minutes, then vacuum dry at 80°C for 4 hours for later use. Add the modified polyurethane elastomer, elastomer toughening agent, molybdenum disulfide, antioxidant 1010, ultraviolet absorber UV-531, and calcium stearate into a high-speed mixer and mix and stir at 300 r / min for 5 minutes. Add the above-treated chopped aramid fibers, transfer to a mixer, and internally mix at 165°C and 200 r / min for 5 minutes. Add dicumyl peroxide and triallyl isocyanurate through the side feed port at 140°C, continue internal mixing for 2 minutes, extrude, cool in a water bath, then pelletize using a pelletizer, and vacuum dry at 80°C for 4 hours to obtain a mobile cable sheath material resistant to tensile deformation.

[0027] Example 2:

[0028] This embodiment describes a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: Add 9 mL of polycarbonate diol T5651, 1.6 mL of isophorone diisocyanate, 0.5 mL of dibutyltin dilaurate, and 6 mL of N,N-dimethylacetamide to a three-necked flask equipped with a stirrer and thermometer. Mix and stir at 80°C for 3 h to obtain a prepolymer. Cool down to 40°C, add 0.65 mL of isocyanate to the prepolymer, mix and stir for 30 min, add 0.9 g of adipic acid dihydrazide and 54 mL of N,N-dimethylacetamide, stir and react for 24 h, degas in a vacuum oven, cure at 80°C for 24 h, and then vacuum dry at 60°C for 50 h to obtain an elastomer. Step S2: Add 1.5g Ti3AlC2, 1.5g LiF and 25mL of 50% ethanol solution to a three-necked flask equipped with a stirrer and thermometer. Disperse by ultrasonication for 25min. Transfer to a ball mill jar with a ball-to-material ratio of 4:1. Ball mill at 350r / min for 8h. Place in a vacuum drying oven at 60℃ and dry for 11h. Add 30mL of 9mol / L hydrochloric acid solution, purge with nitrogen for protection, and react in a water bath at 40℃ for 24h. Use anhydrous ethanol as the washing liquid and centrifuge at 10000r / min for 8min. Transfer the precipitate to a vacuum drying oven at 80℃ and dry for 12h to obtain the intermediate product. Step S3: Add 14g of 2,3-epoxypropyltrimethylammonium chloride, 125mL of deionized water, and 2.5g of melamine to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an oil bath at 90℃ for 12h. Filter at 25℃. Place the filtrate in a vacuum drying oven at 80℃ and evaporate and concentrate for 4min. Add 90mL of n-butanol and mix and stir for 1h. Add 250mL of anhydrous ethanol and 70mL of ethyl acetate and mix and stir for 30min. Allow to stand and separate into layers. Remove the supernatant and wash three times with the mixed solution. Add 1.5g of intermediate product and 25mL of 80% ethanol solution. Disperse by sonication for 13min. Mix and stir at 75℃ for 3.5h. Centrifuge and remove the supernatant. Wash three times with distilled water and vacuum dry at 60℃ for 5h to obtain the precursor. The mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:1. Step S4: Add 13g of elastomer and 160mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer and thermometer, and mix and stir at 90℃ for 4h to obtain a mother liquor; add 0.8g of precursor and 18mL of N,N-dimethylformamide to a beaker and ultrasonically disperse for 15min, add the mother liquor, mix and stir at 90℃ for 3h, pour into a mold, and dry at 60℃ for 50h to obtain the modified polyurethane elastomer; Step S5: Add 7g of polymer elastomer-olefin-styrene-olefin copolymer G1652 and 230mL of chloroform to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an ice-water bath at 3℃ for 30min. Add 4mL of anhydrous SnCl4 and 9mL of 1,4-dichloromethoxybutane. Mix and stir for 6h. Filter, wash the filter cake three times with anhydrous methanol, add 200mL of toluene, and mix and stir for 1.5h to obtain the mother liquor. Add 18g of potassium acetate, 2.3g of tetrabutylammonium bromide and 40mL of deionized water to a beaker. Mix and stir for 30min. Add the above mother liquor, stir and react at 110℃ for 4d. Filter, wash the precipitate three times with anhydrous methanol, and dry at 80℃ for 2.5h to obtain the esterified copolymer. Step S6: Add 7g of the esterified copolymer and 230mL of toluene to a three-necked flask equipped with a condenser and stir for 1.5h. Add 5g of KOH, 1.8g of tetrabutylammonium bromide and 15mL of deionized water to a beaker and stir for 1h. Add the mixture to the three-necked flask and stir at 60℃ for 12h. Filter the mixture, wash the precipitate three times with anhydrous methanol, and dry at 50℃ for 5h to obtain the hydroxylated copolymer. Step S7: Add 4.5g of hydroxylated copolymer and 90mL of chloroform to a three-necked flask equipped with a stirrer and thermometer, and mix and stir for 30min; add 0.4g of 2-amino-4-hydroxy-6-methylpyrimidine, 0.55mL of hexamethylene diisocyanate and 0.04mL of pyridine to a beaker, purge with nitrogen, stir and react at 100℃ for 16h, add 15mL of n-hexane, mix and stir for 30min, filter, wash the precipitate three times with acetone, vacuum dry at 60℃ for 48h, add to the above three-necked flask, add 1.3g of dibutyltin dilaurate, react at 60℃ for 12h, stand for 7h, and dry in a vacuum drying oven at 80℃ for 24h to obtain the elastomer toughening agent; Step S8: Weigh out 55 parts by weight of modified polyurethane elastomer, 6 parts by weight of chopped aramid fiber, 17 parts by weight of elastomer toughening agent, 7 parts by weight of silane coupling agent KH-550, 1 part by weight of dicumyl peroxide, 2 parts by weight of triallyl isocyanurate, 4 parts by weight of molybdenum disulfide, 1 part by weight of antioxidant 1010, 1.5 parts by weight of ultraviolet absorber UV-531, and 1.5 parts by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 4 mm; Step S9: Mix and stir the chopped aramid fibers and silane coupling agent KH-550 for 8 minutes, then vacuum dry at 80°C for 4 hours for later use. Add the modified polyurethane elastomer, elastomer toughening agent, molybdenum disulfide, antioxidant 1010, UV absorber UV-531, and calcium stearate into a high-speed mixer and mix and stir at 400 r / min for 8 minutes. Add the above-treated chopped aramid fibers, transfer to a mixer, and internally mix at 180°C and 300 r / min for 7 minutes. Add dicumyl peroxide and triallyl isocyanurate through the side feed port at 145°C, continue internal mixing for 3 minutes, extrude, cool in a water bath, then pelletize using a pelletizer, and vacuum dry at 80°C for 4 hours to obtain a mobile cable sheath material resistant to tensile deformation.

[0029] Example 3:

[0030] This embodiment describes a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: Add 10 mL of polycarbonate diol T5651, 1.8 mL of isophorone diisocyanate, 0.5 mL of dibutyltin dilaurate, and 6 mL of N,N-dimethylacetamide to a three-necked flask equipped with a stirrer and thermometer. Mix and stir at 80°C for 3 h to obtain a prepolymer. Cool down to 40°C, add 0.7 mL of isocyanate to the prepolymer, mix and stir for 30 min, add 1 g of adipic acid dihydrazide and 54 mL of N,N-dimethylacetamide, stir and react for 24 h, degas in a vacuum oven, cure at 80°C for 24 h, and then vacuum dry at 60°C for 72 h to obtain an elastomer. Step S2: Add 2g Ti3AlC2, 2g LiF and 30mL of 50% ethanol solution to a three-necked flask equipped with a stirrer and thermometer. Disperse by ultrasonication for 30min. Transfer to a ball mill jar with a ball-to-material ratio of 5:1. Ball mill at 400r / min for 9h. Place in a vacuum drying oven at 60℃ and dry for 12h. Add 40mL of 9mol / L hydrochloric acid solution, purge with nitrogen for protection, and react in a water bath at 40℃ for 24h. Use anhydrous ethanol as the washing liquid and centrifuge at 10000r / min for 10min. Transfer the precipitate to a vacuum drying oven at 80℃ and dry for 12h to obtain the intermediate product. Step S3: Add 15g of 2,3-epoxypropyltrimethylammonium chloride, 150mL of deionized water, and 3g of melamine to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an oil bath at 90℃ for 12h. Filter at 25℃. Place the filtrate in a vacuum drying oven at 80℃ and evaporate and concentrate for 5min. Add 100mL of n-butanol and mix and stir for 1h. Add 300mL of anhydrous ethanol and 80mL of ethyl acetate and mix and stir for 30min. Allow to stand and separate into layers. Remove the supernatant and wash three times with the mixed solution. Add 2g of intermediate product and 30mL of 80% ethanol solution. Disperse by sonication for 15min. Mix and stir at 75℃ for 4h. Centrifuge to remove the supernatant. Wash three times with distilled water. Vacuum dry at 60℃ for 6h to obtain the precursor. The mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:1. Step S4: Add 15g of elastomer and 180mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer and thermometer, and mix and stir at 90℃ for 4h to obtain a mother liquor; add 1g of precursor and 20mL of N,N-dimethylformamide to a beaker and ultrasonically disperse for 15min, add the mother liquor, mix and stir at 90℃ for 3h, pour into a mold, and dry at 60℃ for 72h to obtain a modified polyurethane elastomer; Step S5: Add 8g of polymer elastomer-olefin-styrene-olefin copolymer G1652 and 250mL of chloroform to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an ice-water bath at 5℃ for 30min. Add 5mL of anhydrous SnCl4 and 10mL of 1,4-dichloromethoxybutane. Mix and stir for 6h. Filter and wash the filter cake three times with anhydrous methanol. Add 200mL of toluene and mix and stir for 2h to obtain the mother liquor. Add 20g of potassium acetate, 2.5g of tetrabutylammonium bromide and 50mL of deionized water to a beaker and mix and stir for 30min. Add the above mother liquor and stir and react at 110℃ for 4d. Filter and wash the precipitate three times with anhydrous methanol. Dry at 80℃ for 3h to obtain the esterified copolymer. Step S6: Add 8g of the esterified copolymer and 250mL of toluene to a three-necked flask equipped with a condenser and stir for 2h; add 6g of KOH, 2g of tetrabutylammonium bromide and 20mL of deionized water to a beaker and stir for 1h, then add the mixture to the three-necked flask and stir at 60℃ for 12h. Filter the mixture, wash the precipitate three times with anhydrous methanol, and dry at 50℃ for 6h to obtain the hydroxylated copolymer. Step S7: Add 5g of hydroxylated copolymer and 100mL of chloroform to a three-necked flask equipped with a stirrer and thermometer, and mix and stir for 30min; add 0.5g of 2-amino-4-hydroxy-6-methylpyrimidine, 0.6mL of hexamethylene diisocyanate and 0.05mL of pyridine to a beaker, purge with nitrogen, and stir at 100℃ for 16h. Add 20mL of n-hexane, mix and stir for 30min, filter, wash the precipitate three times with acetone, and vacuum dry at 60℃ for 48h. Add the precipitate to the above three-necked flask, add 1.5g of dibutyltin dilaurate, react at 60℃ for 12h, let stand for 8h, and dry in a vacuum drying oven at 80℃ for 24h to obtain the elastomer toughening agent; Step S8: Weigh out 70 parts by weight of modified polyurethane elastomer, 10 parts by weight of chopped aramid fiber, 25 parts by weight of elastomer toughening agent, 8 parts by weight of silane coupling agent KH-550, 1.5 parts by weight of dicumyl peroxide, 3 parts by weight of triallyl isocyanurate, 6 parts by weight of molybdenum disulfide, 1.5 parts by weight of antioxidant 1010, 2 parts by weight of ultraviolet absorber UV-531, and 2 parts by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 5 mm; Step S9: Mix and stir the chopped aramid fibers and silane coupling agent KH-550 for 10 min, then vacuum dry at 80℃ for 4 h for later use; add the modified polyurethane elastomer, elastomer toughening agent, molybdenum disulfide, antioxidant 1010, ultraviolet absorber UV-531 and calcium stearate into a high-speed mixer and mix and stir at 500 r / min for 10 min, add the above-treated chopped aramid fibers, transfer to a mixer, and internally mix at 190℃ and 400 r / min for 8 min. Add dicumyl peroxide and triallyl isocyanurate through the side feed port at 150℃, continue internal mixing for 3 min, extrude, cool in a water bath, then pelletize through a pelletizer, and vacuum dry at 80℃ for 4 h to obtain a mobile cable sheath material resistant to tensile deformation.

[0031] Comparative Example 1: This comparative example illustrates a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: Weigh out 70 parts by weight of polyurethane C60A10HPM, 10 parts by weight of chopped aramid fiber, 8 parts by weight of silane coupling agent KH-550, 1.5 parts by weight of dicumyl peroxide, 3 parts by weight of triallyl isocyanurate, 6 parts by weight of molybdenum disulfide, 1.5 parts by weight of antioxidant 1010, 2 parts by weight of ultraviolet absorber UV-531, and 2 parts by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 5 mm; Step S2: Short-cut aramid fibers and silane coupling agent KH-550 are mixed and stirred for 10 min, and then vacuum dried at 80℃ for 4 h for later use. Polyurethane C60A10HPM, molybdenum disulfide, antioxidant 1010, ultraviolet absorber UV-531 and calcium stearate are added to a high-speed mixer and mixed and stirred at 500 r / min for 10 min. The above-treated short-cut aramid fibers are added, and the mixture is transferred to a mixer and internally mixed at 190℃ and 400 r / min for 8 min. At 150℃, dicumyl peroxide and triallyl isocyanurate are added through the side feed port, and the mixture is continued to be internally mixed for 3 min. The mixture is then extruded, cooled in a water bath, and pelletized by a pelletizer. It is then vacuum dried at 80℃ for 4 h to obtain a mobile cable sheath material resistant to tensile deformation.

[0032] Comparative Example 2: This comparative example illustrates a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: Add 9 mL of polycarbonate diol T5651, 1.6 mL of isophorone diisocyanate, 0.5 mL of dibutyltin dilaurate, and 6 mL of N,N-dimethylacetamide to a three-necked flask equipped with a stirrer and thermometer. Mix and stir at 80°C for 3 h to obtain a prepolymer. Cool down to 40°C, add 0.65 mL of isocyanate to the prepolymer, mix and stir for 30 min, add 0.9 g of adipic acid dihydrazide and 54 mL of N,N-dimethylacetamide, stir and react for 24 h, degas in a vacuum oven, cure at 80°C for 24 h, and then vacuum dry at 60°C for 50 h to obtain an elastomer. Step S2: Add 1.5g Ti3AlC2, 1.5g LiF and 25mL of 50% ethanol solution to a three-necked flask equipped with a stirrer and thermometer. Disperse by ultrasonication for 25min. Transfer to a ball mill jar with a ball-to-material ratio of 4:1. Ball mill at 350r / min for 8h. Place in a vacuum drying oven at 60℃ and dry for 11h. Add 30mL of 9mol / L hydrochloric acid solution, purge with nitrogen for protection, and react in a water bath at 40℃ for 24h. Use anhydrous ethanol as the washing liquid and centrifuge at 10000r / min for 8min. Transfer the precipitate to a vacuum drying oven at 80℃ and dry for 12h to obtain the intermediate product. Step S3: Add 14g of 2,3-epoxypropyltrimethylammonium chloride, 125mL of deionized water, and 2.5g of melamine to a three-necked flask equipped with a stirrer and thermometer. Mix and stir in an oil bath at 90℃ for 12h. Filter at 25℃. Place the filtrate in a vacuum drying oven at 80℃ and evaporate and concentrate for 4min. Add 90mL of n-butanol and mix and stir for 1h. Add 250mL of anhydrous ethanol and 70mL of ethyl acetate and mix and stir for 30min. Allow to stand and separate into layers. Remove the supernatant and wash three times with the mixed solution. Add 1.5g of intermediate product and 25mL of 80% ethanol solution. Disperse by sonication for 13min. Mix and stir at 75℃ for 3.5h. Centrifuge and remove the supernatant. Wash three times with distilled water and vacuum dry at 60℃ for 5h to obtain the precursor. The mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:1. Step S4: Add 13g of elastomer and 160mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer and thermometer, and mix and stir at 90℃ for 4h to obtain a mother liquor; add 0.8g of precursor and 18mL of N,N-dimethylformamide to a beaker and ultrasonically disperse for 15min, add the mother liquor, mix and stir at 90℃ for 3h, pour into a mold, and dry at 60℃ for 50h to obtain the modified polyurethane elastomer; Step S5: Weigh out 55 parts by weight of modified polyurethane elastomer, 6 parts by weight of chopped aramid fiber, 7 parts by weight of silane coupling agent KH-550, 1 part by weight of dicumyl peroxide, 2 parts by weight of triallyl isocyanurate, 4 parts by weight of molybdenum disulfide, 1 part by weight of antioxidant 1010, 1.5 parts by weight of ultraviolet absorber UV-531, and 1.5 parts by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 4 mm; Step S6: Mix and stir the chopped aramid fibers and silane coupling agent KH-550 for 8 minutes, then vacuum dry at 80°C for 4 hours for later use. Add the modified polyurethane elastomer, molybdenum disulfide, antioxidant 1010, UV absorber UV-531, and calcium stearate to a high-speed mixer and mix and stir at 400 r / min for 8 minutes. Add the above-treated chopped aramid fibers and transfer to a mixer. Mix at 180°C and 300 r / min for 7 minutes. Add dicumyl peroxide and triallyl isocyanurate through the side feed port at 145°C and continue mixing for 3 minutes. Extrude the mixture, cool it in a water bath, and then pelletize it using a pelletizer. Vacuum dry at 80°C for 4 hours to obtain a mobile cable sheath material resistant to tensile deformation.

[0033] Comparative Example 3: This comparative example illustrates a method for preparing a mobile cable sheath material resistant to tensile deformation, comprising the following steps: Step S1: 7g of polymer elastomer-olefin-styrene-olefin copolymer G1652 and 230mL of chloroform were added to a three-necked flask equipped with a stirrer and thermometer. The mixture was stirred in an ice-water bath at 3℃ for 30min. 4mL of anhydrous SnCl4 and 9mL of 1,4-dichloromethoxybutane were added, and the mixture was stirred for 6h. The mixture was filtered, and the filter cake was washed three times with anhydrous methanol. 200mL of toluene was added, and the mixture was stirred for 1.5h to obtain the mother liquor. 18g of potassium acetate, 2.3g of tetrabutylammonium bromide, and 40mL of deionized water were added to a beaker, and the mixture was stirred for 30min. The above mother liquor was added, and the mixture was stirred at 110℃ for 4d. The mixture was filtered, and the precipitate was washed three times with anhydrous methanol. The precipitate was dried at 80℃ for 2.5h to obtain the esterified copolymer. Step S2: Add 7g of the esterified copolymer and 230mL of toluene to a three-necked flask equipped with a condenser and stir for 1.5h. Add 5g of KOH, 1.8g of tetrabutylammonium bromide and 15mL of deionized water to a beaker and stir for 1h. Add the mixture to the three-necked flask and stir at 60℃ for 12h. Filter the mixture, wash the precipitate three times with anhydrous methanol, and dry at 50℃ for 5h to obtain the hydroxylated copolymer. Step S3: Add 4.5g of hydroxylated copolymer and 90mL of chloroform to a three-necked flask equipped with a stirrer and thermometer, and mix and stir for 30min; add 0.4g of 2-amino-4-hydroxy-6-methylpyrimidine, 0.55mL of hexamethylene diisocyanate and 0.04mL of pyridine to a beaker, purge with nitrogen, and stir and react at 100℃ for 16h. Add 15mL of n-hexane, mix and stir for 30min, filter, wash the precipitate three times with acetone, and vacuum dry at 60℃ for 48h. Add the precipitate to the above three-necked flask, add 1.3g of dibutyltin dilaurate, react at 60℃ for 12h, let stand for 7h, and dry in a vacuum drying oven at 80℃ for 24h to obtain the elastomer toughening agent; Step S4: Weigh out 55 parts by weight of polyurethane C60A10HPM, 6 parts by weight of chopped aramid fiber, 17 parts by weight of elastomer toughening agent, 7 parts by weight of silane coupling agent KH-550, 1 part by weight of dicumyl peroxide, 2 parts by weight of triallyl isocyanurate, 4 parts by weight of molybdenum disulfide, 1 part by weight of antioxidant 1010, 1.5 parts by weight of ultraviolet absorber UV-531, and 1.5 parts by weight of calcium stearate; the chopped aramid fiber is aramid 1414 and has a length of 4 mm; Step S5: Mix and stir the chopped aramid fibers and silane coupling agent KH-550 for 8 minutes, then vacuum dry at 80°C for 4 hours for later use. Add polyurethane C60A10HPM, elastomer toughening agent, molybdenum disulfide, antioxidant 1010, UV absorber UV-531, and calcium stearate to a high-speed mixer and mix and stir at 400 r / min for 8 minutes. Add the above-treated chopped aramid fibers and transfer to a mixer. Mix at 180°C and 300 r / min for 7 minutes. Add dicumyl peroxide and triallyl isocyanurate through the side feed port at 145°C and continue mixing for 3 minutes. Extrude the mixture, cool it in a water bath, and then pelletize it using a pelletizer. Vacuum dry at 80°C for 4 hours to obtain a mobile cable sheath material resistant to tensile deformation.

[0034] The tensile deformation resistant mobile cable sheath materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested according to standard GB / T 2951.11-2008 for tensile strength (the maximum tensile stress recorded when the specimen is stretched to fracture), elongation at break (the percentage increase in the marked distance to the marked distance of the unstretched specimen when the specimen is stretched to fracture), and tensile deformation (permanent deformation). The test results are as follows: Figure 1-3 As shown: Comparing Examples 1-3 with Comparative Examples 1-3: In Examples 1-3, the amount of raw materials gradually increases, and the higher the aramid fiber content, the stronger the ability to bear and transfer stress, and the higher the strength. The formulation of Example 2 achieves the best synergy between the rigid network and the dynamic network, resulting in the lowest tensile permanent deformation. In Example 3, excessive reinforcing phase hinders the recombination of UPy groups, leading to relatively poor resilience. Comparing Example 2 with Comparative Example 1, it can be seen that: Comparative Example 1 uses ordinary polyurethane without elastomer toughening agents, relying solely on simple blending of aramid fibers. The material only contains physically doped fibers and a polymer matrix, lacking toughening and energy dissipation mechanisms, resulting in low strength. The elongation at break and tensile permanent deformation were the worst. Comparing Example 2 with Comparative Example 2, it can be seen that Comparative Example 2 lacks an elastomer toughening agent and contains a modified polyurethane elastomer. The modified polyurethane elastomer and aramid fiber provide high strength, but the material lacks reversible sacrificial bonds to dissipate energy. The molecular chains are prone to irreversible slippage or breakage, resulting in increased elongation at break and poor resistance to permanent deformation. Comparing Example 2 with Comparative Example 3, it can be seen that Comparative Example 3 lacks a modified polyurethane elastomer and uses an elastomer toughening agent. The elastomer toughening agent provides good toughness, but the matrix itself has insufficient strength and modulus, low tensile strength, and high permanent deformation.

[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A mobile cable sheath material resistant to tensile deformation, characterized in that, Includes the following components by weight: The mixture contains 40-70 parts of modified polyurethane elastomer, 3-10 parts of chopped aramid fiber, 10-25 parts of elastomer toughening agent, 5-8 parts of silane coupling agent, 0.5-1.5 parts of crosslinking agent, 1-3 parts of co-crosslinking agent, 2-6 parts of wear-resistant agent, 0.5-1.5 parts of antioxidant, 1-2 parts of ultraviolet absorber, and 1-2 parts of lubricant. The modified polyurethane elastomer is prepared by the following steps: Step a1: Mix and stir the polyester glycol, the first part of isophorone diisocyanate, dibutyltin dilaurate and the first part of N,N-dimethylacetamide to obtain a prepolymer; add the second part of isophorone diisocyanate, mix and stir, add adipic dihydrazide and the second part of N,N-dimethylacetamide, stir to react, degas under vacuum, cure and dry to obtain an elastomer; Step a2: Disperse Ti3AlC2, LiF and ethanol solution by ultrasonication, ball mill, dry, add hydrochloric acid solution, react under water bath heating, centrifuge and wash, dry the precipitate to obtain intermediate product; Step a3: 2,3-epoxypropyltrimethylammonium chloride, deionized water and melamine were stirred and reacted in an oil bath, filtered, the filtrate was evaporated and concentrated, n-butanol was added, and the mixture was stirred. Anhydrous ethanol and ethyl acetate were added, and the mixture was stirred. The mixture was allowed to stand and separate into layers, the supernatant was removed, and the mixture was washed with the mixed solution. The intermediate product and ethanol solution were added, and the mixture was ultrasonically dispersed, stirred, centrifuged, the supernatant was removed, washed, and dried to obtain the precursor. Step a4: Mix the elastomer and the first part of N,N-dimethylformamide to obtain a mother liquor; ultrasonically disperse the precursor and the second part of N,N-dimethylformamide, add them to the mother liquor, mix and stir, pour into a mold, and dry to obtain the modified polyurethane elastomer.

2. The tensile deformation resistant mobile cable sheath material according to claim 1, characterized in that, The chopped aramid fiber is aramid 1414 with a length of 3-5 mm; the silane coupling agent is KH-550; the crosslinking agent is dicumyl peroxide; the co-crosslinking agent is triallyl isocyanurate; the wear-resistant agent is one of molybdenum disulfide and graphite; the antioxidant is 1010; the ultraviolet absorber is UV-531; and the lubricant is calcium stearate.

3. The mobile cable sheath material resistant to tensile deformation according to claim 1, characterized in that, In step a1, the ratio of the total amount of polyester diol, isophorone diisocyanate, dibutyltin dilaurate, N,N-dimethylacetamide, and adipate dihydrazide is 8-10 mL: 2-2.5 mL: 0.5 mL: 60 mL: 0.8-1 g; the polyester diol is one of polycarbonate diol T5651 and polycaprolactone diol PCL1000; the first part of isophorone diisocyanate accounts for 2 / 3 of the total amount of isophorone diisocyanate; the second part of isophorone diisocyanate accounts for 1 / 3 of the total amount of isophorone diisocyanate; the first part of N,N-dimethylacetamide accounts for 1 / 10 of the total amount of N,N-dimethylacetamide; the second part of N,N-dimethylacetamide accounts for 9 / 10 of the total amount of N,N-dimethylacetamide.

4. The tensile deformation resistant mobile cable sheath material according to claim 1, characterized in that, In step a2, the ratio of Ti3AlC2, LiF, ethanol solution, and hydrochloric acid solution is 1-2g:1-2g:20-30mL:20-40mL; the mass fraction of the ethanol solution in step a2 is 50%; the concentration of the hydrochloric acid solution is 9mol / L. In step a3, the ratio of 2,3-epoxypropyltrimethylammonium chloride, deionized water, melamine, n-butanol, anhydrous ethanol, ethyl acetate, intermediate product, and ethanol solution is 13-15g:100-150mL:2-3g:80-100mL:200-300mL:50-80mL:1-2g:20-30mL; the mass fraction of the ethanol solution in step a3 is 80%; the mixed solution is prepared by mixing anhydrous ethanol and ethyl acetate in a volume ratio of 1:

1.

5. The tensile deformation resistant mobile cable sheath material according to claim 1, characterized in that, In step a4, the ratio of the elastomer, the total amount of N,N-dimethylformamide, and the precursor is 10-15g: 150-200mL: 0.5-1g; the first part of N,N-dimethylformamide accounts for 9 / 10 of the total amount of N,N-dimethylformamide; and the second part of N,N-dimethylformamide accounts for 1 / 10 of the total amount of N,N-dimethylformamide.

6. The tensile deformation resistant mobile cable sheath material according to claim 1, characterized in that, The elastomer toughening agent is prepared by the following steps: Step b1: The polymer elastomer-olefin-styrene-olefin copolymer and chloroform are mixed and stirred in an ice-water bath. Anhydrous SnCl4 and 1,4-dichloromethoxybutane are added, the mixture is stirred and reacted, filtered, the filter cake is washed, toluene is added, and the mixture is stirred to obtain the mother liquor. Potassium acetate, tetrabutylammonium bromide and deionized water are mixed and stirred, the mother liquor is added, the mixture is stirred and reacted, filtered, the precipitate is washed, and dried to obtain the esterified copolymer. Step b2: Add the esterified copolymer and toluene to a three-necked flask and mix and stir; add KOH, tetrabutylammonium bromide and deionized water to the three-necked flask, stir and react, filter, wash the precipitate, and dry to obtain the hydroxylated copolymer; Step b3: Add the hydroxylated copolymer and chloroform to a three-necked flask and stir; add 2-amino-4-hydroxy-6-methylpyrimidine, hexamethylene diisocyanate and pyridine and stir to react, add n-hexane, mix and stir, filter, wash the precipitate, dry, add to the above three-necked flask, add dibutyltin dilaurate, react, stand, dry, and obtain the elastomer toughening agent.

7. The tensile deformation resistant mobile cable sheath material according to claim 6, characterized in that, In step b1, the ratio of the polymer elastomer-olefin-styrene-olefin copolymer, chloroform, anhydrous SnCl4, 1,4-dichloromethoxybutane, toluene, potassium acetate, tetrabutylammonium bromide, and deionized water is 6-8g:200-250mL:3-5mL:8-10mL:200mL:15-20g:2-2.5g:30-50mL; the polymer elastomer-olefin-styrene-olefin copolymer is of type G1652.

8. The tensile deformation resistant mobile cable sheath material according to claim 6, characterized in that, The ratio of the esterified copolymer, toluene, KOH, tetrabutylammonium bromide and deionized water used in step b2 is 6-8g: 200-250mL: 4-6g: 1.5-2g: 10-20mL.

9. The tensile deformation resistant mobile cable sheath material according to claim 6, characterized in that, The ratio of the hydroxylated copolymer, chloroform, 2-amino-4-hydroxy-6-methylpyrimidine, hexamethylene diisocyanate, pyridine, n-hexane, and dibutyltin dilaurate in step b3 is 4-5g: 80-100mL: 0.3-0.5g: 0.5-0.6mL: 0.02-0.05mL: 10-20mL: 1-1.5g.

10. A method for preparing a mobile cable sheath material resistant to tensile deformation as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Weigh out the following components by weight: 40-70 parts modified polyurethane elastomer, 3-10 parts chopped aramid fiber, 10-25 parts elastomer toughening agent, 5-8 parts silane coupling agent, 0.5-1.5 parts crosslinking agent, 1-3 parts co-crosslinking agent, 2-6 parts wear-resistant agent, 0.5-1.5 parts antioxidant, 1-2 parts ultraviolet absorber, and 1-2 parts lubricant. Step 2: Mix and stir the chopped aramid fibers and silane coupling agent, dry them, and set them aside. Add the modified polyurethane elastomer, elastomer toughening agent, wear-resistant agent, antioxidant, UV absorber, and lubricant to a high-speed mixer and mix them. Add the chopped aramid fibers treated above, transfer them to an internal mixer, and continue mixing. Add crosslinking agent and co-crosslinking agent through the side feed port, continue mixing, extrusion, cooling, pelletizing, and drying to obtain a mobile cable sheath material resistant to tensile deformation.

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