Wear-resistant and weather-resistant polyethylene cable material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of cables, and discloses a wear-resistant and weather-resistant polyethylene cable material as well as a preparation method and application thereof. The wear-resistant and weather-resistant polyethylene cable material comprises the following components: 50-150 parts of blended polyethylene; 10 to 20 parts of ethylene propylene diene monomer; 1 to 7 parts of modified graphene; 0.1 to 5 parts of titanium oxide; 0.3-5 parts of a hindered amine light stabilizer; 0.2-3 parts of an ultraviolet light absorber; 0.5 to 3 parts of a lubricant; 0.7 to 3 parts of an antioxidant; the blended polyethylene consists of ultra-high molecular weight polyethylene and high-density polyethylene in a mass ratio of (1-4): (9-6); the modified graphene is composed of lysine modified graphene and acylating chlorinated graphene, and the mass ratio of lysine modified graphene to acylating chlorinated graphene is (1-8): (5-15). The tensile strength of the wear-resistant and weather-resistant polyethylene cable material can reach 28.7 MPa, the elongation at break can reach 560%, the retention rate of the tensile strength reaches up to 94%, the retention rate of the elongation at break reaches up to 91%, the abrasion loss is as low as 0.03 cm < 3 > / 1.61 km, and the wear-resistant and weather-resistant polyethylene cable material has excellent wear resistance and weather resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a wear-resistant and weather-resistant polyethylene cable material, a preparation method thereof, and an application thereof. Background Art

[0002] Plastics for insulating and sheathing of wires and cables are commonly known as cable materials, including various varieties such as rubber, plastic, and nylon. Among them, polyethylene cable materials have very wide applications in the field of wires and cables due to their light weight, good mechanical properties, as well as excellent low-temperature resistance, good environmental stress cracking resistance, and good processability. Therefore, polyethylene cable materials are one of the indispensable important components in cable materials.

[0003] During the long-term exposure of existing cable materials to the natural environment (such as ultraviolet rays, temperature and humidity changes, chemical pollution, etc.), phenomena such as damage, fracture, heating, and aging are likely to occur. This is because the existing polyethylene cable materials have poor wear resistance and weather resistance, and it is necessary to further improve the wear resistance and weather resistance of polyethylene cable materials. Summary of the Invention

[0004] The present invention provides a polyethylene cable material with wear resistance and weather resistance superior to the prior art.

[0005] Another object of the present invention is to provide a preparation method of the wear-resistant and weather-resistant polyethylene cable material.

[0006] Another object of the present invention is to provide an application of the wear-resistant and weather-resistant polyethylene cable material in the preparation of cables.

[0007] To solve the above technical problems, the technical solution provided by the present invention is:

[0008] A wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0009] Blended polyethylene: 50 - 150 parts;

[0010] Ethylene propylene diene monomer rubber: 10 - 20 parts;

[0011] Modified graphene: 1 - 7 parts;

[0012] Titanium oxide: 0.1 - 5 parts;

[0013] Hindered amine light stabilizer: 0.3 - 5 parts;

[0014] Ultraviolet absorber: 0.2 - 3 parts

[0015] Lubricant: 0.5 - 3 parts;

[0016] Antioxidant: 0.7 - 3 parts;

[0017] The blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is (1-4):(9-6);

[0018] The modified graphene is composed of lysine-modified graphene and acyl chloride graphene, and the mass ratio of the two is (1-8):(5-15).

[0019] The polyethylene cable material provided by the present invention improves the wear resistance of the cable material in the following aspects:

[0020] (1) In the polyethylene cable material components, after the ultra-high molecular weight polyethylene with a large entanglement density of molecular chains is blended with high-density polyethylene, the ultra-high molecular weight polyethylene provides a wear-resistant skeleton, and the high-density polyethylene enhances the stiffness of the material through the crystalline structure, enhancing the wear resistance of the cable material;

[0021] (2) In the modified graphene, the amino group (-NH2) on the acyl chloride graphene forms a hydrogen bond with the polyethylene chain segment, improving the interfacial bonding force and inhibiting the agglomeration of fillers. The high modulus (1 TPa) and high strength (130 GPa) of the graphene sheets can bear the load and reduce the matrix deformation; and the acyl chloride group (-COCl) on the acyl chloride graphene reacts with the double bond in the ethylene propylene diene monomer rubber to form a chemical crosslink, enhancing the compatibility of the graphene and EPDM. Moreover, the two-dimensional barrier effect of the graphene can hinder the crack propagation and extend the fatigue life of the material, enhancing the wear resistance of the polyethylene cable material.

[0022] (3) The synergistic enhancement of ethylene propylene diene monomer rubber (EPDM): As a flexible phase, EPDM absorbs the impact stress through the energy dissipation mechanism, reducing the shedding of wear particles. Its non-polar structure has good compatibility with polyethylene, forming an island structure to avoid direct contact between rigid particles and the friction surface.

[0023] In addition, nano-TiO2, as a reinforcing filler, hinders the molecular chain slip through the pinning effect, improving the hardness of the material. After being treated with a silane coupling agent, a covalent bond is formed at the interface between TiO2 and the matrix, avoiding the particle shedding caused by stress concentration.

[0024] The polyethylene cable material provided by the present invention improves the weather resistance of the cable material in the following aspects:

[0025] (1) Light stability: In the polyethylene cable material components, the ultraviolet absorber absorbs harmful wavelength bands, and the intramolecular hydrogen bond structure converts the absorbed light energy into heat energy to avoid the transfer of excited state energy to the polymer chain; the reflectivity of TiO2 to ultraviolet light is >90%, forming a physical barrier to reduce the penetration depth; the hindered amine light stabilizer (HALS) captures the free radicals (ROO·, HO·) generated by photooxidation through the piperidine group to terminate the chain reaction, and the reversible conversion of the piperidine nitrogen free radical (N·→N-H) makes it have long-term effectiveness and avoids the consumption of the stabilizer itself; moreover, the conjugated structure of the graphene acyl chloride can adsorb free radicals, inhibit photooxidation, lysine modification provides an alkaline environment to neutralize acidic degradation products, and the two-dimensional barrier effect of the graphene sheets hinders the penetration of ultraviolet light, prolongs the photoaging time, and improves the weather resistance of the polyethylene cable material.

[0026] (2) Antioxidation: The antioxidant plays a role in capturing peroxy free radicals (ROO·), terminating the oxidation chain reaction, decomposing hydroperoxides (ROOH), and preventing secondary oxidation; moreover, the π electron cloud of the graphene acyl chloride can chelate metal ions (such as Fe 3+ ), inhibit its catalytic oxidation effect, the amino group (-NH2) of lysine forms a hydrogen bond with the polyethylene chain segment, stabilizes the molecular chain conformation, and reduces thermal oxygen degradation; in addition, the surface defect sites of the nano-TiO2 can adsorb and quench free radicals, and at the same time its high thermal conductivity accelerates heat diffusion, improving the weather resistance of the polyethylene cable material.

[0027] Preferably, the mass ratio of ultra-high molecular weight polyethylene to high-density polyethylene in the blended polyethylene is (2.5 - 3.5):(6.5 - 7.5).

[0028] Preferably, the mass ratio of lysine-modified graphene to graphene acyl chloride in the modified graphene is (2 - 6):(8 - 13).

[0029] Preferably, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0030] Blended polyethylene 70 - 120 parts;

[0031] Blended polyethylene 70 - 120 parts;

[0032] Ethylene propylene diene monomer rubber 13 - 18 parts;

[0033] Modified graphene 2 - 5 parts;

[0034] Titanium oxide 1 - 3 parts;

[0035] Hindered amine light stabilizer 1 - 3 parts;

[0036] Ultraviolet absorber 1 - 2.4 parts

[0037] Lubricant 1.2 - 2.7 parts;

[0038] 1.5 to 2.5 parts of antioxidant.

[0039] Preferably, the ultra-high molecular weight polyethylene has a molecular weight of 1.5 million to 5 million.

[0040] Preferably, the high density polyethylene has a molecular weight of 100,000 to 500,000.

[0041] Preferably, the hindered amine light stabilizer is selected from one or more of Tinuvin 770, Tinuvin 944, Cyasorb UV-3346 and GW-622.

[0042] Specifically: Tinuvin 770 is bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate;

[0043] Tinuvin 944 is poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidyl)imino]];

[0044] Cyasorb UV-3346 is poly{(6-morpholino-5-triazine-2,4-diyl)(2,2,6,6-tetramethylpiperidyl)iminohexamethylene[(2,2,6,6-tetramethylpiperidyl)-imino]};

[0045] GW-622 is poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) succinate.

[0046] The function of the hindered amine light stabilizer in the polyethylene cable material is as follows:

[0047] (1) Compound with ultraviolet absorber: Combine with benzotriazoles (such as Tinuvin 326) or benzophenones (such as UV-531) to broaden the protection band and improve the weather resistance of the polyethylene cable material;

[0048] (2) Synergize with antioxidant: Combine with hindered phenol antioxidants (such as Irganox 1010, Irganox 1076, Topanol CA) to enhance the thermal oxygen stability.

[0049] The antioxidant described in the present invention is selected from one or more of Irganox 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]), Irganox 1076 (octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate), and Topanol CA (diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate).

[0050] Preferably, the ultraviolet absorber is selected from one or more of benzotriazoles, benzophenones, and triazines.

[0051] Specifically: The benzotriazoles are selected from one or more of Tinuvin 326 (2-(2H-benzotriazol-2-yl)-4-methyl-6-tert-butylphenol), Tinuvin 328 (2-(2-hydroxy-3,5-di-tert-amylphenyl)benzotriazole), and UV-P (2-(2'-hydroxy-5'-methylphenyl)benzotriazole);

[0052] The benzophenones are selected from one or two of UV-531 (2-hydroxy-4-n-octyloxybenzophenone) and UV-9 (2-hydroxy-4-methoxybenzophenone);

[0053] The triazines are selected from one or two of UV1577 (2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol) and triazine-5 (2,4,6-tris(2'-hydroxy-4'-n-butoxyphenyl)-1,3,5-triazine).

[0054] The function of the ultraviolet absorber in the polyethylene cable compound is as follows:

[0055] (1) Compound with hindered amine light stabilizers (HALS): The UVA absorbs ultraviolet rays, and the HALS captures free radicals to form an "absorption - quenching" synergistic system.

[0056] (2) Synergize with antioxidants: Inhibit thermal oxygen aging and improve the weather resistance of the polyethylene cable compound.

[0057] The lubricant described in the present invention is selected from one or more of stearic acid, calcium stearate, zinc stearate, paraffin wax, polyethylene wax, and oxidized polyethylene wax.

[0058] The present invention also protects the preparation method of the wear-resistant and weather-resistant polyethylene cable compound, which includes the following steps:

[0059] S1. Put the blended polyethylene and ethylene-propylene-diene monomer rubber into a twin-screw extruder, melt and blend them to obtain a molten mixture;

[0060] S2. First, add modified graphene and titanium oxide to the molten mixture and mix them evenly, then add hindered amine light stabilizer, ultraviolet absorber and antioxidant, and mix evenly to obtain a mixed material;

[0061] S3. Transfer the mixed material to a twin-screw extruder for melt blending. After the extrudate is cooled by water or air and then pelletized, the wear-resistant and weather-resistant polyethylene cable material is obtained.

[0062] Preferably, in S1, the melt blending temperature is 140 - 160 °C, the time is 5 - 10 min, and the rotation speed is 30 - 50 rpm.

[0063] Preferably, in S3, the melt blending temperature is 160 - 180 °C, and the screw rotation speed is 200 - 300 rpm.

[0064] Before the step S1 of the preparation method of the present invention, there is also a raw material pretreatment step S0, which is specifically as follows:

[0065] S0. Raw material pretreatment:

[0066] S01. Blending polyethylene: Mix ultra-high molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE) evenly according to the mass ratio of (1 - 4):(6 - 9), place them in an oven at 80 - 100 °C for 2 - 4 hours to remove moisture;

[0067] S02. Modified graphene: Pre-mix lysine-modified graphene and acyl chloride graphene according to the mass ratio of (1 - 8):(5 - 15), and treat them by ultrasonic dispersion or high-speed stirring (500 - 1000 rpm) for 30 minutes to enhance the dispersion;

[0068] S03. Titanium oxide: It can be pretreated with a silane coupling agent (such as KH550) to improve the compatibility with the polymer matrix.

[0069] The present invention also protects the application of the wear-resistant and weather-resistant polyethylene cable material described in any one of the above in the preparation of polyethylene cables. Specific embodiments

[0070] The following further elaborates on the present invention in detail in combination with specific embodiments.

[0071] The preparation methods of acyl chloride graphene in each example and comparative example include the following steps:

[0072] S1. Dispersion of graphene oxide: Add graphene oxide (GO) to DMF, and ultrasonically disperse it for 30 minutes to 1 hour to form a uniform suspension, denoted as GO suspension; the addition ratio of graphene oxide is 3 mg / mL;

[0073] S2. Acylation reaction: At room temperature, add pyridine accounting for 0.5 wt% of the mass of graphene oxide to the GO suspension first, and then slowly dropwise add an excessive amount of SOCl2 and stir for reaction for 20 hours; the addition amount of SOCl2 is 8 times the mass of GO;

[0074] S3. Product separation and washing: After the reaction is completed, first centrifuge at 10000 rpm for 10 minutes and discard the supernatant; then, wash the precipitate 4 times with excessive DMF or THF to remove unreacted SOCl2 and by-products, and alternately wash with deionized water and ethanol to remove residual solvents; finally, place the product in a vacuum drying oven and dry at 60 °C for 12 - 24 hours to obtain acyl chloride graphene (GO-COCl).

[0075] The preparation method of lysine-modified graphene in each example and comparative example includes the following steps:

[0076] S1. Dispersion of graphene oxide: Add graphene oxide to deionized water and perform ultrasonic treatment with an ultrasonic cleaner for 2 hours to uniformly disperse graphene oxide in water and form a stable graphene oxide suspension;

[0077] S2. Adjust the pH value: Dropwise add ammonia water to the graphene oxide suspension to adjust the pH value of the solution to 8.5;

[0078] S3. Addition and reaction of lysine: First, weigh L-lysine according to the mass ratio of graphene oxide to lysine of 1:8 and add it to the graphene oxide suspension with the adjusted pH value obtained in S2; then place the mixed solution in an oil bath and stir for reaction at 85 °C for 18 hours;

[0079] S4. Post-treatment: After the reaction is completed, first transfer the mixed solution to a centrifuge and centrifuge at a speed of 9000 r / min for 15 minutes to precipitate the modified product, and pour out the supernatant; then alternately wash the precipitate with deionized water and hydrochloric acid solution for 3 - 5 times to remove unreacted lysine and other impurities; finally, place the washed precipitate in an oven and dry at 70 °C for 18 hours to finally obtain the lysine-modified graphene product.

[0080] Example 1

[0081] A wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0082] Blended polyethylene 100 parts;

[0083] Ethylene propylene diene monomer rubber 15 parts;

[0084] Modified graphene 3 parts;

[0085] Titanium oxide 2.3 parts;

[0086] 1.8 parts of hindered amine light stabilizer;

[0087] 1.5 parts of ultraviolet absorber

[0088] 1.7 parts of lubricant;

[0089] 2 parts of antioxidant;

[0090] In the blended polyethylene, the mass ratio of ultra-high molecular weight polyethylene to high density polyethylene is 5:5, the molecular weight of ultra-high molecular weight polyethylene is 3 million, and the molecular weight of high density polyethylene is 300,000; in the modified graphene, the mass ratio of lysine modified graphene to acyl chloride graphene is 5:11; the hindered amine light stabilizer is bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate; the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the ultraviolet absorber is 2-(2H-benzotriazol-2-yl)-4-methyl-6-tert-butylphenol; the lubricant is calcium stearate.

[0091] The preparation method of the wear-resistant and weather-resistant polyethylene cable material includes the following steps:

[0092] S0. Raw material pretreatment:

[0093] S01. Blended polyethylene: Mix ultra-high molecular weight polyethylene (UHMWPE) and high density polyethylene (HDPE) evenly according to the mass ratio of 5:5, place them in an oven at 90°C for 3 hours to remove moisture, and obtain blended polyethylene;

[0094] S02. Modified graphene: Pre-mix lysine modified graphene and acyl chloride graphene according to the mass ratio of 5:11, and use ultrasonic dispersion or high-speed stirring at 800 rpm for 30 minutes to enhance the dispersion, and obtain modified graphene;

[0095] S03. Titanium oxide pretreatment: First, hydrolyze the silane coupling agent KH550 in ethanol and acetic acid solution; then add titanium oxide powder to the hydrolyzed KH550 solution and ultrasonically treat for 20 minutes; and transfer the ultrasonically treated mixed solution to a reaction vessel, and continuously stir and react for 3 hours at room temperature; finally, obtain KH550 pretreated titanium oxide after washing and drying.

[0096] S1. Put the blended polyethylene and ethylene propylene diene monomer rubber into a twin-screw extruder for melt blending, where the melt blending temperature is 150°C, the time is 8 minutes, and the rotation speed is 40 rpm to obtain a molten mixture;

[0097] S2. First, add modified graphene and titanium oxide to the molten mixture and mix them evenly, and then add hindered amine light stabilizers, ultraviolet absorbers, and antioxidants, and mix them evenly to obtain a mixed material;

[0098] S3. Transfer the mixed material to a twin-screw extruder for melt blending. The melt blending temperature is 170 °C, the screw speed is 250 rpm, and the extrudate is pelletized after water cooling or air cooling to obtain the wear-resistant and weather-resistant polyethylene cable material.

[0099] Example 2

[0100] This example is the second example of the present invention. Different from Example 1, the blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is 2.5:7.5.

[0101] Example 3

[0102] This example is the third example of the present invention. Different from Example 1, the blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is 3.5:6.5.

[0103] Example 4

[0104] This example is the fourth example of the present invention. Different from Example 1, the blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is 1:9.

[0105] Example 5

[0106] This example is the fifth example of the present invention. Different from Example 1, the blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is 4:6.

[0107] Example 6

[0108] This example is the fourth example of the present invention. Different from Example 1, the mass ratio of lysine-modified graphene and acyl chloride graphene in the modified graphene is 2:13.

[0109] Example 7

[0110] This example is the fifth example of the present invention. Different from Example 1, the mass ratio of lysine-modified graphene and acyl chloride graphene in the modified graphene is 6:8.

[0111] Example 8

[0112] This example is the eighth example of the present invention. Different from Example 1, the mass ratio of lysine-modified graphene and acyl chloride graphene in the modified graphene is 1:15.

[0113] Example 9

[0114] This embodiment is the 9th embodiment of the present invention. Different from Embodiment 1, the mass ratio of lysine-modified graphene to acyl chloride-modified graphene in the modified graphene is 8:5.

[0115] Embodiment 10

[0116] This embodiment is the 10th embodiment of the present invention. Different from Embodiment 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0117] Blended polyethylene: 70 parts

[0118] Ethylene propylene diene monomer rubber: 13 parts

[0119] Modified graphene: 2 parts

[0120] Titanium oxide: 1 part

[0121] Hindered amine light stabilizer: 1 part

[0122] Ultraviolet absorber: 1 part

[0123] Lubricant: 1.2 parts

[0124] Antioxidant: 1.5 parts

[0125] Embodiment 11

[0126] This embodiment is the 11th embodiment of the present invention. Different from Embodiment 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0127] Blended polyethylene: 120 parts

[0128] Ethylene propylene diene monomer rubber: 18 parts

[0129] Modified graphene: 5 parts

[0130] Titanium oxide: 3 parts

[0131] Hindered amine light stabilizer: 3 parts

[0132] Ultraviolet absorber: 2.4 parts

[0133] Lubricant: 2.7 parts

[0134] Antioxidant: 2.5 parts

[0135] Embodiment 12

[0136] This embodiment is the 12th embodiment of the present invention. Different from Embodiment 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0137] Blended polyethylene: 50 parts

[0138] 10 parts of ethylene propylene diene monomer rubber;

[0139] 1 part of modified graphene;

[0140] 0.1 part of titanium oxide;

[0141] 0.3 part of hindered amine light stabilizer;

[0142] 0.2 part of ultraviolet absorber

[0143] 0.5 part of lubricant;

[0144] 0.7 part of antioxidant;

[0145] The molecular weight of the ultra-high molecular weight polyethylene is 1.5 million, and the molecular weight of the high-density polyethylene is 100,000; the hindered amine light stabilizer is poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]; the antioxidant is octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; the ultraviolet absorber is 2-hydroxy-4-n-octyloxybenzophenone) and UV-9 (2-hydroxy-4-methoxybenzophenone); the lubricant is paraffin wax.

[0146] In the preparation method of the wear-resistant and weather-resistant polyethylene cable material: in S1, the melt blending temperature is 140 °C, the time is 5 min, and the rotation speed is 30 rpm;

[0147] In S3, the melt blending temperature is 160 °C, and the screw rotation speed is 200 rpm.

[0148] Example 13

[0149] This example is the 12th example of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0150] 150 parts of blended polyethylene;

[0151] 20 parts of ethylene propylene diene monomer rubber;

[0152] 7 parts of modified graphene;

[0153] 5 parts of titanium oxide;

[0154] 5 parts of hindered amine light stabilizer;

[0155] 3 parts of ultraviolet absorber

[0156] 3 parts of lubricant;

[0157] 3 parts of antioxidant;

[0158] The molecular weight of the ultra-high molecular weight polyethylene is 5 million, and the molecular weight of the high-density polyethylene is 500,000; the hindered amine light stabilizer is 1,3,5-triazine-2,4,6-triamine; the antioxidant is diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; the ultraviolet absorber is 2-(2-hydroxy-3,5-di-tert-amylphenyl)benzotriazole; the lubricant is oxidized polyethylene wax.

[0159] In the preparation method of the wear-resistant and weather-resistant polyethylene cable material: in S1, the melt blending temperature is 160 °C, the time is 10 min, and the rotation speed is 50 rpm;

[0160] In S3, the melt blending temperature is 180 °C and the screw rotation speed is 300 rpm.

[0161] Comparative Example 1

[0162] This comparative example is the first comparative example of the present invention. Different from Example 1, all the polyethylene in the wear-resistant and weather-resistant polyethylene cable material is high-density polyethylene, and ultra-high molecular weight polyethylene is not added.

[0163] Comparative Example 2

[0164] This comparative example is the second comparative example of the present invention. Different from Example 1, all the polyethylene in the wear-resistant and weather-resistant polyethylene cable material is ultra-high molecular weight polyethylene, and high-density polyethylene is not added.

[0165] Comparative Example 3

[0166] This comparative example is the third comparative example of the present invention. Different from Example 1, all the modified graphene in the wear-resistant and weather-resistant polyethylene cable material is lysine-modified graphene, and acyl chloride graphene is not added.

[0167] Comparative Example 4

[0168] This comparative example is the fourth comparative example of the present invention. Different from Example 1, all the modified graphene in the wear-resistant and weather-resistant polyethylene cable material is acyl chloride-modified graphene, and lysine graphene is not added.

[0169] Comparative Example 5

[0170] This comparative example is the fourth comparative example of the present invention. Different from Example 1, the graphene in the wear-resistant and weather-resistant polyethylene cable material is conventional graphene and is not modified.

[0171] Comparative Example 6

[0172] This comparative example is the sixth example of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0173] 180 parts of blended polyethylene;

[0174] 25 parts of ethylene propylene diene monomer rubber;

[0175] 10 parts of modified graphene;

[0176] 7 parts of titanium oxide;

[0177] 8 parts of hindered amine light stabilizer;

[0178] 5 parts of ultraviolet absorber

[0179] 5 parts of lubricant;

[0180] 5 parts of antioxidant.

[0181] Comparative Example 7

[0182] This comparative example is the 7th embodiment of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material contains the following components:

[0183] 40 parts of blended polyethylene;

[0184] 7 parts of ethylene propylene diene monomer rubber;

[0185] 0.8 part of modified graphene;

[0186] 0.05 part of titanium oxide;

[0187] 0.2 part of hindered amine light stabilizer;

[0188] 0.1 part of ultraviolet absorber

[0189] 0.3 part of lubricant;

[0190] 0.5 part of antioxidant.

[0191] Comparative Example 8

[0192] This comparative example is the 8th embodiment of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material components do not contain ultraviolet absorber.

[0193] Comparative Example 9

[0194] This comparative example is the 9th embodiment of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material components do not contain TiO2.

[0195] Comparative Example 10

[0196] This comparative example is the 10th embodiment of the present invention. Different from Example 1, the wear-resistant and weather-resistant polyethylene cable material components do not contain hindered amine light stabilizer.

[0197] Performance testing:

[0198] Mechanical properties: The test methods for tensile strength and elongation at break refer to GB / T 2951.11-2008 General Test Methods for Insulating and Sheathing Materials of Cables and Optical Fibre Cables - Part 11: General Test Methods - Measurement of Thickness and Dimensions - Mechanical Property Tests. The test results of each example and comparative example are shown in Table 1.

[0199] Weather resistance: Simulate natural sunlight (including ultraviolet rays, visible light, and infrared radiation) through xenon arc lamp, combined with temperature (black standard temperature 65 ± 3 °C), humidity (relative humidity 50 ± 5%), and water spray cycle (18 min / 102 min). The test cycle is 1000 h. Calculate the retention rates of tensile strength and elongation at break of the cable material to evaluate the weather resistance. The weather resistance test results of the polyethylene cable materials provided in each example and comparative example are shown in Table 1.

[0200] Abrasion resistance: The abrasion test method refers to GB / T 3960-1983 Test Method for Sliding Friction and Wear of Plastics. The test results of each example and comparative example are shown in Table 1.

[0201] Table 1 Performance Tests of Polyethylene Cable Materials Obtained from Examples 1-13 and Comparative Examples 1-10

[0202]

[0203]

[0204] As described above, it is only the implementation mode of the present invention, and the scope of patent protection is not limited thereby. Those skilled in the art make non-substantive changes or substitutions based on the present invention, and still fall within the scope of patent protection.

Claims

1. A wear-resistant and weather-resistant polyethylene cable compound, characterized in that It contains the following components: Blended polyethylene: 50 - 150 parts; Ethylene propylene diene monomer rubber: 10 - 20 parts; Modified graphene: 1 - 7 parts; Titanium oxide: 0.1 - 5 parts; Hindered amine light stabilizer: 0.3 - 5 parts; Ultraviolet absorber: 0.2 - 3 parts Lubricant: 0.5 - 3 parts; Antioxidant: 0.7 - 3 parts; The blended polyethylene is composed of ultra-high molecular weight polyethylene and high-density polyethylene, and the mass ratio of the two is (1 - 4):(6 - 9); The modified graphene is composed of lysine-modified graphene and acyl chloride graphene, and the mass ratio of the two is (1 - 8):(5 - 15).

2. The wear-resistant and weather-resistant polyethylene cable material according to claim 1, wherein The mass ratio of ultra-high molecular weight polyethylene to high-density polyethylene in the blended polyethylene is (2.5 - 3.5):(6.5 - 7.5).

3. The wear-resistant and weather-resistant polyethylene cable compound according to claim 1, wherein The mass ratio of lysine-modified graphene to acyl chloride graphene in the modified graphene is (2 - 6):(8 - 13).

4. The wear-resistant and weather-resistant polyethylene cable compound according to claim 1, wherein, It contains the following components: Blended polyethylene: 70 - 120 parts; Ethylene propylene diene monomer rubber: 13 - 18 parts; Modified graphene: 2 - 5 parts; Titanium oxide: 1 - 3 parts; Hindered amine light stabilizer: 1 - 3 parts; Ultraviolet absorber: 1 - 2.4 parts Lubricant: 1.2 - 2.7 parts; Antioxidant: 1.5 - 2.5 parts.

5. The wear-resistant and weather-resistant polyethylene cable material according to claim 1, wherein The molecular weight of the ultra-high molecular weight polyethylene is 1.5 million - 5 million.

6. The wear-resistant and weather-resistant polyethylene cable compound according to claim 1, wherein The molecular weight of the high-density polyethylene is 100,000 - 500,000.

7. The wear-resistant and weather-resistant polyethylene cable compound according to claim 1, wherein The hindered amine light stabilizer is selected from one or more of Tinuvin 770, Tinuvin 944, Cyasorb UV-3346, and GW-622.

8. The wear-resistant and weather-resistant polyethylene cable material according to claim 1, wherein, The ultraviolet absorber is selected from one or more of benzotriazole, benzophenone, and triazine.

9. A preparation method of the wear-resistant and weather-resistant polyethylene cable material according to any one of claims 1 to 8, characterized in that, It includes the following steps: S1. Put the blended polyethylene and ethylene propylene diene monomer rubber into a twin-screw extruder, melt and blend them to obtain a molten mixture; S2. First add the modified graphene and titanium oxide to the molten mixture and mix evenly, then add the hindered amine light stabilizer, ultraviolet absorber, and antioxidant, and mix evenly to obtain a mixed material; S3. Transfer the mixed material to a twin-screw extruder, conduct melt blending, and cut the extrudate into pellets after water cooling or air cooling to obtain the wear-resistant and weather-resistant polyethylene cable material.

10. Use of the wear-resistant and weather-resistant polyethylene cable material according to any one of claims 1 - 8 in the preparation of polyethylene cables.

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