1. The cross-linked irradiation polyolefin cable material is characterized by comprising the following raw materials in parts by weight: 120-150 parts of base material, 12-22 parts of environment-friendly flame retardant, 8-15 parts of methyl silicone oil, 1-1.5 parts of triallyl isocyanurate, 1-3 parts of 2,2, 4-trimethyl isobutyl pentanediol, 3-5 parts of N, N' -di-sec-butyl p-phenylenediamine and 1-3 parts of nickel dibutyl dithiocarbamate.

2. The crosslinked irradiated polyolefin cable material of claim 1, comprising the following raw materials in parts by weight: 140 portions of base material 130-140 portions, 14-20 portions of environment-friendly flame retardant, 10-14 portions of methyl silicone oil, 1.2-1.4 portions of triallyl isocyanurate, 1.2-2.8 portions of 2,2, 4-trimethyl isobutyl pentanediol, 3.5-4.5 portions of N, N' -di-sec-butyl p-phenylenediamine and 1.5-2.5 portions of nickel dibutyl dithiocarbamate.

3. The crosslinked irradiated polyolefin cable material of claim 1, comprising the following raw materials in parts by weight: 135 parts of base material, 17 parts of environment-friendly flame retardant, 12 parts of methyl silicone oil, 1.3 parts of triallyl isocyanurate, 2.6 parts of 2,2, 4-trimethyl isobutyl pentanediol, 4 parts of N, N' -di-sec-butyl p-phenylenediamine and 2 parts of nickel dibutyl dithiocarbamate.

4. The cable material of claim 1, wherein the matrix material comprises the following raw materials in percentage by weight: 10-18% of polytetrafluoroethylene, 5-10% of silicon micropowder, 3-7% of N-phenylmaleimide, 5-12% of dipentaerythritol, 5-10% of ethyl acetate and the balance of polyethylene.

5. The crosslinked irradiation polyolefin cable material according to claim 4, wherein the polyethylene is prepared by compounding low density polyethylene and high density polyethylene in a mass ratio of 22-28: 3-5.

6. The crosslinking irradiation polyolefin cable material according to claim 1, wherein the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate in a mass ratio of 5-8:1-2: 3-5.

7. The cable material of claim 1, wherein the mass ratio of triallyl isocyanurate to 2,2, 4-trimethylpentanediol isobutyl ester is 1: 1-2.

8. A method for preparing a cross-linked irradiated polyolefin cable material according to any of claims 1-9, characterized in that it comprises the following steps:

s1, preparing a base material:

s11, weighing 10-18% of polytetrafluoroethylene, 5-10% of silicon micropowder, 3-7% of N-phenylmaleimide, 5-12% of dipentaerythritol, 5-10% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, N-phenylmaleimide, dipentaerythritol and ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 8-12min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 70-90 ℃ and the rotating speed of 600-800r/min for 20-40min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 5-8:1-2:3-5, and uniformly grinding and mixing to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 150 parts of matrix material, 12-22 parts of environment-friendly flame retardant, 8-15 parts of methyl silicone oil, 1-1.5 parts of triallyl isocyanurate, 1-3 parts of 2,2, 4-trimethyl pentanediol isobutyl ester, 3-5 parts of N, N' -di-sec-butyl p-phenylenediamine and 1-3 parts of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125-145 ℃ and the rotating speed of 800r/min for 20-40min, and extruding into wires through an extruder after uniform mixing;

s33, irradiating the extruded wire by an electron accelerator, and thermally extending by 8-12% after irradiation to form the cross-linked irradiation polyolefin cable material with a three-dimensional network structure.

9. The method as claimed in claim 8, wherein the extruder in step S3 has an extrusion temperature of 165-185 ℃ and a screw rotation speed of 60-80 r/min.

10. The method for preparing a cross-linked irradiated polyolefin cable material as claimed in claim 1, wherein the irradiation processing conditions in step S3 are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂And irradiating the wire for 10-20min at the irradiation dose rate of 10kGy/h in the atmosphere.

Background

The crosslinking irradiation technology refers to a technology for realizing the crosslinking reaction of macromolecules by a chemical mode (such as adding a crosslinking agent) or a physical method (such as irradiation) so that a linear polymer becomes a polymer with a three-dimensional space network structure. The cross-linking irradiation technology was applied to military products for the first time, and is gradually applied to civil products, especially to the field of electronic cables. The technological principle of the cross-linking irradiation technology is that after the polyolefin base material with linear chain molecular structure is irradiated, high-energy electron beams can effectively and uniformly penetrate through an insulating layer to initiate cross-linking reaction, so that a cross-linking bond with high binding energy and good stability is formed, and the molecular structure of the base material is changed from a linear chain to a cross-linked three-dimensional network. The cross-linking irradiation keeps the original excellent electrical property of the polyolefin, improves other properties and has unique excellent characteristics in the aspect of mechanical properties.

The electronic cable is an indispensable connecting wire in electronic and electrical equipment, is regarded as blood vessels and nerves of the products, and is widely applied to the fields of electronic information, automobiles and other products. In 1954, Avno Barhs et al irradiated PE with high energy electrons to convert its linear structure into a three dimensional network, from which the cross-linking irradiation technique was first applied to the insulation of power cables. After that, the cross-linking irradiation technology has attracted much attention in improving the flame retardant property, mechanical property and other properties of polyolefin cable materials. Chinese invention patent CN104231420A discloses a 105 ℃ temperature-resistant irradiation crosslinking low-smoke halogen-free flame-retardant insulating material, and specifically discloses the following technical characteristics: 100 parts of base resin, 150 parts of flame retardant 130-; the base resin comprises the following components: ethylene-vinyl acetate rubber (EVM) and ethylene-octene copolymer (POE) in a weight ratio of (60-85): (10-25); the flame retardant is magnesium hydroxide; the coupling agent is vinyl triethoxysilane. The 105 ℃ temperature-resistant grade irradiation crosslinking low-smoke halogen-free flame-retardant insulating material prepared by the patent has the advantages of low smoke and high flexibility, however, the dosage of the flame retardant of the irradiation crosslinking low-smoke halogen-free flame-retardant insulating material is more than 50% of the total weight of the raw materials, and the vinyltriethoxysilane is used as the coupling agent, so that the irradiation crosslinking low-smoke halogen-free flame-retardant insulating material has good flame retardance, but poor self-extinguishing property, lower mechanical strength, and mechanical properties such as wear resistance and tensile resistance which cannot meet the use requirements of wires and cables. Based on the above statement, the invention provides a crosslinking irradiation polyolefin cable material and a preparation method thereof.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, a cross-linked irradiation cable material has good flame retardance but poor self-extinguishing property, has low mechanical strength and cannot meet the use requirements of wires and cables in mechanical properties such as wear resistance, tensile resistance and the like, and provides a cross-linked irradiation polyolefin cable material and a preparation method thereof.

A cross-linked irradiation polyolefin cable material comprises the following raw materials in parts by weight: 120-150 parts of base material, 12-22 parts of environment-friendly flame retardant, 8-15 parts of methyl silicone oil, 1-1.5 parts of triallyl isocyanurate, 1-3 parts of 2,2, 4-trimethyl isobutyl pentanediol, 3-5 parts of N, N' -di-sec-butyl p-phenylenediamine and 1-3 parts of nickel dibutyl dithiocarbamate.

Preferably, the cross-linked irradiation polyolefin cable material comprises the following raw materials in parts by weight: 140 portions of base material 130-140 portions, 14-20 portions of environment-friendly flame retardant, 10-14 portions of methyl silicone oil, 1.2-1.4 portions of triallyl isocyanurate, 1.2-2.8 portions of 2,2, 4-trimethyl isobutyl pentanediol, 3.5-4.5 portions of N, N' -di-sec-butyl p-phenylenediamine and 1.5-2.5 portions of nickel dibutyl dithiocarbamate.

Preferably, the cross-linked irradiation polyolefin cable material comprises the following raw materials in parts by weight: 135 parts of base material, 17 parts of environment-friendly flame retardant, 12 parts of methyl silicone oil, 1.3 parts of triallyl isocyanurate, 2.6 parts of 2,2, 4-trimethyl isobutyl pentanediol, 4 parts of N, N' -di-sec-butyl p-phenylenediamine and 2 parts of nickel dibutyl dithiocarbamate.

Preferably, the base material consists of the following raw materials in percentage by weight: 10-18% of polytetrafluoroethylene, 5-10% of silicon micropowder, 3-7% of N-phenylmaleimide, 5-12% of dipentaerythritol, 5-10% of ethyl acetate and the balance of polyethylene.

Preferably, the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene in a mass ratio of 22-28: 3-5.

Preferably, the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 5-8:1-2: 3-5.

Preferably, the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1: 1-2.

The invention also provides a preparation method of the cross-linked irradiation polyolefin cable material, which comprises the following steps:

s1, preparing a base material:

s11, weighing 10-18% of polytetrafluoroethylene, 5-10% of silicon micropowder, 3-7% of N-phenylmaleimide, 5-12% of dipentaerythritol, 5-10% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, N-phenylmaleimide, dipentaerythritol and ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 8-12min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 70-90 ℃ and the rotating speed of 600-800r/min for 20-40min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 5-8:1-2:3-5, and uniformly grinding and mixing to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 150 parts of matrix material, 12-22 parts of environment-friendly flame retardant, 8-15 parts of methyl silicone oil, 1-1.5 parts of triallyl isocyanurate, 1-3 parts of 2,2, 4-trimethyl pentanediol isobutyl ester, 3-5 parts of N, N' -di-sec-butyl p-phenylenediamine and 1-3 parts of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125-145 ℃ and the rotating speed of 800r/min for 20-40min, and extruding into wires through an extruder after uniform mixing;

s33, irradiating the extruded wire by an electron accelerator, and thermally extending by 8-12% after irradiation to form the cross-linked irradiation polyolefin cable material with a three-dimensional network structure.

Preferably, the extrusion temperature of the extruder in the step S3 is 165-185 ℃, and the screw rotation speed is 60-80 r/min.

Preferably, the irradiation processing conditions in step S3 are: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂And irradiating the wire for 10-20min at the irradiation dose rate of 10kGy/h in the atmosphere.

The cross-linked irradiation polyolefin cable material provided by the invention has the following beneficial effects:

1. the invention adopts polyethylene, polytetrafluoroethylene, silica micropowder, N-phenylmaleimide, dipentaerythritol and ethyl acetate to mix and prepare the matrix material for the cable material, and the obtained matrix material has good heat resistance, impact resistance, processability and compatibility, excellent mechanical property and strong intermolecular binding force.

2. According to the invention, zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate are blended and ground to prepare the environment-friendly flame retardant, the obtained flame retardant is safe and nontoxic, is used for flame retardance of cable materials, has the characteristics of small mixing amount and excellent flame retardance and self-extinguishing property, and can be added as an auxiliary agent to improve the performances of the cable materials such as pulverization resistance and mildew resistance.

3. The cross-linked irradiation polyolefin cable material provided by the invention has the advantages of simple preparation method and mild preparation conditions, and the obtained cable material with the three-dimensional net structure has excellent electrical insulation, good flame retardance, good self-extinguishing property, high mechanical strength, excellent wear resistance and tensile strength, can meet the use requirements of high-performance wires and cables, and can be widely applied.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

Example one

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 120 parts of base material, 12 parts of environment-friendly flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl-p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate;

the base material comprises the following raw materials in percentage by weight: 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene, wherein the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene in a mass ratio of 22: 3;

the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 5:1: 3;

the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1:1.

The preparation method comprises the following steps:

s1, preparing a base material:

s11, weighing 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, the N-phenylmaleimide, the dipentaerythritol and the ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 8min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 70 ℃ at the rotating speed of 600r/min for 20min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 5:1:3, and grinding and mixing uniformly to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 120 parts of a base material, 12 parts of an environment-friendly flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125 ℃ at the rotating speed of 600r/min for 20min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 165 ℃, and the rotating speed of a screw is 60 r/min;

s33, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 10min at the irradiation dose rate of 10kGy/h, and the thermal extension is 8 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

Example two

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 135 parts of base material, 17 parts of environment-friendly flame retardant, 12 parts of methyl silicone oil, 1.2 parts of triallyl isocyanurate, 1.8 parts of 2,2, 4-trimethyl isobutyl pentanediol, 4 parts of N, N' -di-sec-butyl p-phenylenediamine and 2 parts of nickel dibutyl dithiocarbamate;

the base material comprises the following raw materials in percentage by weight: 14% of polytetrafluoroethylene, 8% of silicon micropowder, 5% of N-phenylmaleimide, 8% of dipentaerythritol, 8% of ethyl acetate and the balance of polyethylene, wherein the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene according to a mass ratio of 25: 4;

the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 6.5:1.5: 4;

the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1: 1.5.

The preparation method comprises the following steps:

s1, preparing a base material:

s11, weighing 14% of polytetrafluoroethylene, 8% of silicon micropowder, 5% of N-phenylmaleimide, 8% of dipentaerythritol, 8% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, the N-phenylmaleimide, the dipentaerythritol and the ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 10min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 80 ℃ at the rotating speed of 700r/min for 30min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together according to the mass ratio of 6.5:1.5:4, and grinding and mixing uniformly to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 135 parts of a matrix material, 17 parts of an environment-friendly flame retardant, 12 parts of methyl silicone oil, 1.2 parts of triallyl isocyanurate, 1.8 parts of 2,2, 4-trimethyl isobutyl pentanediol, 4 parts of N, N' -di-sec-butyl p-phenylenediamine and 2 parts of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 135 ℃ at the rotating speed of 700r/min for 30min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 175 ℃, and the rotating speed of a screw is 70 r/min;

s33, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 15min at the irradiation dose rate of 10kGy/h, and the thermal extension is 10 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

EXAMPLE III

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 150 parts of base material, 22 parts of environment-friendly flame retardant, 15 parts of methyl silicone oil, 1.5 parts of triallyl isocyanurate, 3 parts of 2,2, 4-trimethyl isobutyl pentanediol, 5 parts of N, N' -di-sec-butyl p-phenylenediamine and 3 parts of nickel dibutyl dithiocarbamate;

the base material comprises the following raw materials in percentage by weight: 18% of polytetrafluoroethylene, 10% of silicon micropowder, 7% of N-phenylmaleimide, 12% of dipentaerythritol, 10% of ethyl acetate and the balance of polyethylene, wherein the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene according to a mass ratio of 28: 5;

the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 8:2: 5;

the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1: 2.

The preparation method comprises the following steps:

s1, preparing a base material:

s11, weighing 18% of polytetrafluoroethylene, 10% of silicon micropowder, 7% of N-phenylmaleimide, 12% of dipentaerythritol, 10% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, the N-phenylmaleimide, the dipentaerythritol and the ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 12min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 90 ℃ at the rotating speed of 800r/min for 40min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 8:2:5, and grinding and mixing uniformly to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 150 parts of a base material, 22 parts of an environment-friendly flame retardant, 15 parts of methyl silicone oil, 1.5 parts of triallyl isocyanurate, 3 parts of 2,2, 4-trimethyl isobutyl pentanediol, 5 parts of N, N' -di-sec-butyl p-phenylenediamine and 3 parts of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 145 ℃ and the rotating speed of 800r/min for 40min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 185 ℃, and the rotating speed of a screw is 80 r/min;

s33, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 20min at the irradiation dose rate of 10kGy/h, and the thermal extension is 12 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

Comparative example 1

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 120 parts of base material, 12 parts of environment-friendly flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl-p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate;

the base material is prepared by compounding polytetrafluoroethylene and polyethylene according to the mass ratio of 1:7.2, and the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene according to the mass ratio of 22: 3;

the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 5:1: 3;

the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1:1.

The preparation method comprises the following steps:

s1, preparing a base material:

adding polytetrafluoroethylene and polyethylene into a high-speed mixer together according to the mass ratio of 1:7.2, stirring and mixing at the temperature of 70 ℃ and the rotating speed of 600r/min for 20min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 5:1:3, and grinding and mixing uniformly to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 120 parts of a base material, 12 parts of an environment-friendly flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125 ℃ at the rotating speed of 600r/min for 20min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 165 ℃, and the rotating speed of a screw is 60 r/min;

s33, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 10min at the irradiation dose rate of 10kGy/h, and the thermal extension is 8 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

Comparative example No. two

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 120 parts of base material, 12 parts of flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate;

the base material comprises the following raw materials in percentage by weight: 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene, wherein the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene in a mass ratio of 22: 3;

the flame retardant is magnesium hydroxide;

the mass ratio of the triallyl isocyanurate to the isobutyl 2,2, 4-trimethylpentanediolate is 1:1.

The preparation method comprises the following steps:

s1, preparing a base material:

s11, weighing 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, the N-phenylmaleimide, the dipentaerythritol and the ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 8min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 70 ℃ at the rotating speed of 600r/min for 20min, and uniformly mixing to obtain a base material;

s2, preparing a cable material:

s21, weighing 120 parts of a base material, 12 parts of a flame retardant, 8 parts of methyl silicone oil, 1 part of triallyl isocyanurate, 1 part of 2,2, 4-trimethyl isobutyl pentanediol, 3 parts of N, N' -di-sec-butyl p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate for later use;

s22, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125 ℃ at the rotating speed of 600r/min for 20min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 165 ℃, and the rotating speed of a screw is 60 r/min;

s23, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 10min at the irradiation dose rate of 10kGy/h, and the thermal extension is 8 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

Comparative example No. three

The invention provides a cross-linked irradiation polyolefin cable material which comprises the following raw materials in parts by weight: 120 parts of base material, 12 parts of environment-friendly flame retardant, 8 parts of methyl silicone oil, 2 parts of triallyl isocyanurate, 3 parts of N, N' -di-sec-butyl-p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate;

the base material comprises the following raw materials in percentage by weight: 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene, wherein the polyethylene is prepared by compounding low-density polyethylene and high-density polyethylene in a mass ratio of 22: 3;

the environment-friendly flame retardant is prepared by compounding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate according to the mass ratio of 5:1: 3;

the preparation method comprises the following steps:

s1, preparing a base material:

s11, weighing 10% of polytetrafluoroethylene, 5% of silicon micropowder, 3% of N-phenylmaleimide, 5% of dipentaerythritol, 5% of ethyl acetate and the balance of polyethylene according to the following weight percentage for later use;

s12, adding the silicon micropowder, the N-phenylmaleimide, the dipentaerythritol and the ethyl acetate into an ultrasonic disperser together at room temperature, and carrying out ultrasonic treatment for 8min to obtain a modifier;

s13, adding polyethylene, polytetrafluoroethylene and a modifier into a high-speed mixer together, stirring and mixing at the temperature of 70 ℃ at the rotating speed of 600r/min for 20min, and uniformly mixing to obtain a base material;

s2, preparing an environment-friendly flame retardant:

adding zinc borate, barium metaborate and tris (1, 3-dichloroisopropyl) phosphate into a grinding machine together in a mass ratio of 5:1:3, and grinding and mixing uniformly to obtain an environment-friendly flame retardant;

s3, preparing a cable material:

s31, weighing 120 parts of a base material, 12 parts of an environment-friendly flame retardant, 8 parts of methyl silicone oil, 2 parts of triallyl isocyanurate, 3 parts of N, N' -di-sec-butyl-p-phenylenediamine and 1 part of nickel dibutyl dithiocarbamate for later use;

s32, adding the raw materials into a high-speed mixer together, stirring and mixing at the temperature of 125 ℃ at the rotating speed of 600r/min for 20min, uniformly mixing, and extruding into wires by an extruder, wherein the extrusion temperature of the extruder is 165 ℃, and the rotating speed of a screw is 60 r/min;

s33, performing irradiation processing on the extruded wire by an electron accelerator, wherein the irradiation processing conditions are as follows: by gamma⁶⁰C_OThe source strength is 3.7 multiplied by 10¹⁵Radiation source of Bq, at room temperature, N₂In the atmosphere, the wire is irradiated for 10min at the irradiation dose rate of 10kGy/h, and the thermal extension is 8 percent after the irradiation, so that the cross-linked irradiation polyolefin cable material with the three-dimensional network structure is formed.

According to the standard JB/T10436-:

the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.