Low-smoke halogen-free environment-friendly cable material and preparation method thereof

Abstract

The application provides a low-smoke halogen-free environment-friendly cable material and a preparation method thereof. The cable material comprises the following raw materials in parts by weight: ethylene-vinyl acetate copolymer 40-48 parts, polyethylene resin 20-32 parts, acetate fiber 13-18 parts, epoxy soybean oil 1-3 parts, ethylene bis-stearamide 2-5 parts, triethyl citrate 2-5 parts, polyethylene glycol diacrylate 3-6 parts, N-methylol acrylamide 3-6 parts, modified nano-oxide 8-12 parts, flame-retardant additive 13-18 parts, and antioxidant 0.1-0.6 parts. The cable material of the application uses ethylene-vinyl acetate copolymer, polyethylene resin, triethyl citrate, polyethylene glycol diacrylate, N-methylol acrylamide, modified nano-oxide, flame-retardant additive and antioxidant as raw materials, and through the synergistic effect of the raw materials, the tensile strength and elongation at break of the cable can be effectively improved, the cable does not contain halogen raw materials, has high flame-retardant effect, releases low smoke during combustion, and has good application prospect.

Description

Technical Field

[0001] This invention relates to the field of cable material technology, and in particular to a low-smoke, halogen-free, environmentally friendly cable material and its preparation method. Background Technology

[0002] Cables are the carriers of communication and power transmission. With the vigorous development of various fields in my country, cables have been widely used in power, construction, transportation, communication, and other fields. Therefore, cables need to possess properties such as flame retardancy, insulation, heat resistance, aging resistance, and radiation resistance. For a long time, traditional cables have mainly used halogen-containing polymers such as chloroprene rubber, polyvinyl chloride, and chlorosulfonated polyethylene as materials. Although these raw materials have good flame retardant properties, they release a large amount of harmful gases and smoke, causing serious harm to the human body and hindering fire rescue. Therefore, low-smoke, halogen-free, flame-retardant, environmentally friendly cables with excellent insulation and flame retardancy have become a hot topic in the cable industry. Currently, the production of low-smoke halogen-free cable materials mostly involves adding large amounts of aluminum hydroxide, magnesium hydroxide, and other materials to polyolefin materials to achieve a flame-retardant effect. However, although adding a large amount of inorganic materials can achieve a flame-retardant effect, it affects the tensile strength, aging resistance, and other properties of the cable, thus affecting the service life of low-smoke halogen-free environmentally friendly cables. Summary of the Invention

[0003] In view of this, the present invention proposes a low-smoke halogen-free environmentally friendly cable material and its preparation method.

[0004] The technical solution of this invention is implemented as follows:

[0005] A low-smoke, halogen-free, environmentally friendly cable material comprises the following raw materials in parts by weight: 40-48 parts of ethylene-vinyl acetate copolymer, 20-32 parts of polyethylene resin, 13-18 parts of cellulose acetate, 1-3 parts of epoxidized soybean oil, 2-5 parts of ethylene bis-stearamide, 2-5 parts of triethyl citrate, 3-6 parts of polyethylene glycol diacrylate, 3-6 parts of N-hydroxymethylacrylamide, 8-12 parts of modified nano-oxide, 13-18 parts of flame retardant additives, and 0.1-0.6 parts of antioxidant.

[0006] Furthermore, the modified nano-oxide raw material includes nano-titanium dioxide, nano-zinc dioxide, hydrogenated castor oil acid, and γ-aminopropyltriethoxysilane in a mass ratio of 3-5:2-3:0.03-0.05:0.02-0.03.

[0007] Furthermore, the modified nano-oxide is prepared by: mixing nano-titanium dioxide and hydrogenated ricinoleic acid once, then adding nano-zinc dioxide and continuing to mix, and finally adding γ-aminopropyltriethoxysilane and mixing again, followed by drying to obtain the modified nano-oxide.

[0008] Furthermore, the stirring speed for the first mixing step is 300-500 r / min and the time is 5-7 min; the time for the continued mixing step is 3-5 min; and the stirring speed for the second mixing step is 800-1000 r / min and the time is 6-9 min.

[0009] Furthermore, the flame retardant additive comprises the following raw materials in parts by weight: 20-25 parts diatomaceous earth, 16-20 parts magnesium hydroxide, 9-13 parts aluminum tripolyphosphate, 9-13 parts polyether modified silicone oil, and 3-5 parts polydimethylsiloxane.

[0010] Furthermore, the preparation method of the flame retardant additive is as follows: diatomaceous earth and magnesium hydroxide are stirred and mixed to obtain a mixture, then polyether modified silicone oil is added and stirred and mixed, then aluminum tripolyphosphate is added and stirred and mixed, and finally polydimethylsiloxane is added and stirred and mixed to obtain the flame retardant additive.

[0011] Furthermore, the mixing temperature is 70-80℃, the mixing speed is 600-800 r / min, and the mixing time is 8-15 min.

[0012] Furthermore, the antioxidant is one or more of antioxidant 1076, antioxidant 1010, and antioxidant 168.

[0013] The preparation method of low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0014] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide are mixed at high speed and then modified nano-oxide, flame retardant additives, and antioxidants are added and mixed at high speed again to obtain a mixed material.

[0015] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0016] Furthermore, the high-speed stirring speed is 700-800 r / min and the time is 5-10 min.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The cable material of this invention uses ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, N-hydroxymethylacrylamide, modified nano-oxides, flame retardant additives, and antioxidants as raw materials. Through the synergistic effect of each raw material, it can effectively improve the tensile strength and elongation at break of the cable. It does not contain halogen raw materials, has a high flame retardant effect, and releases less smoke when burning, showing good application prospects.

[0019] The cable material of the present invention, through the synergistic effect of raw materials such as epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide, can improve the interfacial compatibility between organic and inorganic raw materials, thereby effectively improving the processing performance of the cable material such as strength, hardness, and density.

[0020] This invention adds modified nano-oxides to cable materials. Hydrogenated castor oil and γ-aminopropyltriethoxysilane are used to modify the nano-oxides, effectively improving the interfacial compatibility between the nano-oxides and raw materials such as ethylene-vinyl acetate copolymer and polyethylene resin. This enhances the penetration and bonding strength of the nano-oxides, allowing them to stably fill the voids in these materials. This effectively improves the strength, hardness, density, and other processing properties of the cable material. Furthermore, the nano-oxides possess certain anti-aging properties, extending the cable's aging resistance.

[0021] This invention uses diatomaceous earth, magnesium hydroxide, aluminum tripolyphosphate, polyether-modified silicone oil, and polydimethylsiloxane as raw materials to prepare flame retardant additives. These additives can form a dense carbon layer during combustion, blocking combustible gases and oxygen, thus achieving an effective flame retardant effect. At the same time, they can also be effectively integrated with other raw materials, further improving the mechanical properties of cable materials. Detailed Implementation

[0022] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0023] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0024] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0025] Example 1

[0026] The low-smoke halogen-free environmentally friendly cable material of this embodiment includes the following raw materials in parts by weight: 48 parts of ethylene-vinyl acetate copolymer, 20 parts of polyethylene resin, 15 parts of cellulose acetate, 2 parts of epoxidized soybean oil, 4 parts of ethylene bis-stearamide, 2 parts of triethyl citrate, 3 parts of polyethylene glycol diacrylate, 5 parts of N-hydroxymethyl acrylamide, 8 parts of modified nano-oxide, 18 parts of flame retardant additive, and 0.3 parts of antioxidant; the antioxidant is antioxidant 1076.

[0027] The modified nano-oxide raw materials include nano-titanium dioxide, nano-zinc dioxide, hydrogenated castor oil acid, and γ-aminopropyltriethoxysilane in a mass ratio of 4:3:0.05:0.02.

[0028] The flame retardant additive comprises the following raw materials in parts by weight: 25 parts diatomaceous earth, 16 parts magnesium hydroxide, 9 parts aluminum tripolyphosphate, 10 parts polyether-modified silicone oil, and 3 parts polydimethylsiloxane.

[0029] The modified nano-oxide is prepared as follows: nano-titanium dioxide and hydrogenated ricinoleic acid are stirred and mixed for 7 minutes at a stirring speed of 400 r / min. Then, nano-zinc dioxide is added and stirred and mixed for another 3 minutes. Finally, γ-aminopropyltriethoxysilane is added and stirred and mixed again for 7 minutes at a stirring speed of 900 r / min. After drying, the modified nano-oxide is obtained.

[0030] The preparation method of the flame retardant additive is as follows: Diatomaceous earth and magnesium hydroxide are stirred at 75℃ and 800r / min for 10 minutes to obtain a mixture. Then, polyether modified silicone oil is added and stirred at 75℃ and 800r / min for 8 minutes to obtain a mixture. Next, aluminum tripolyphosphate is added and stirred at 75℃ and 800r / min for 10 minutes to obtain a mixture. Finally, polydimethylsiloxane is added and stirred at 75℃ and 800r / min for 12 minutes to obtain a flame retardant additive.

[0031] The preparation method of this low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0032] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide were mixed at high speed of 760 r / min for 10 min. Then, modified nano-oxide, flame retardant additives, and antioxidants were added and the mixture was mixed again at high speed of 800 r / min for 8 min to obtain a mixed material.

[0033] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0034] Example 2

[0035] The low-smoke, halogen-free, environmentally friendly cable material of this embodiment includes the following raw materials in parts by weight: 40 parts of ethylene-vinyl acetate copolymer, 32 parts of polyethylene resin, 13 parts of cellulose acetate, 3 parts of epoxidized soybean oil, 5 parts of ethylene bis-stearamide, 3 parts of triethyl citrate, 6 parts of polyethylene glycol diacrylate, 3 parts of N-hydroxymethyl acrylamide, 12 parts of modified nano-oxide, 13 parts of flame retardant additive, and 0.6 parts of antioxidant; the antioxidant is antioxidant 1010; the modified nano-oxide raw material includes nano-titanium dioxide, nano-zinc dioxide, hydrogenated ricinoleic acid, and γ-aminopropyltriethoxysilane in a mass ratio of 3:2:0.04:0.03.

[0036] The flame retardant additive comprises the following raw materials in parts by weight: 21 parts diatomaceous earth, 17 parts magnesium hydroxide, 13 parts aluminum tripolyphosphate, 9 parts polyether-modified silicone oil, and 5 parts polydimethylsiloxane.

[0037] The modified nano-oxide is prepared by: mixing nano-titanium dioxide and hydrogenated ricinoleic acid at a stirring speed of 300 r / min for 6 min, then adding nano-zinc dioxide and continuing to mix for 4 min, and finally adding γ-aminopropyltriethoxysilane and mixing again at a stirring speed of 1000 r / min for 6 min, and drying to obtain the modified nano-oxide.

[0038] The flame retardant additive is prepared as follows: diatomaceous earth and magnesium hydroxide are stirred at 70°C and 600 r / min for 8 minutes to obtain a mixture. Then, polyether-modified silicone oil is added and stirred at 70°C and 600 r / min for 10 minutes to obtain a mixture. Next, aluminum tripolyphosphate is added and stirred at 70°C and 600 r / min for 12 minutes to obtain a mixture. Finally, polydimethylsiloxane is added and stirred at 70°C and 700 r / min for 13 minutes to obtain a flame retardant additive.

[0039] The preparation method of this low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0040] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide were mixed at high speed of 700 r / min for 8 min. Then, modified nano-oxide, flame retardant additives, and antioxidants were added and mixed again at high speed of 750 r / min for 9 min to obtain a mixed material.

[0041] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0042] Example 3

[0043] The low-smoke, halogen-free, environmentally friendly cable material of this embodiment includes the following raw materials in parts by weight: 46 parts of ethylene-vinyl acetate copolymer, 28 parts of polyethylene resin, 16 parts of cellulose acetate, 1 part of epoxidized soybean oil, 3 parts of ethylene bis-stearamide, 5 parts of triethyl citrate, 5 parts of polyethylene glycol diacrylate, 4 parts of N-hydroxymethyl acrylamide, 10 parts of modified nano-oxide, 14 parts of flame retardant additive, and 0.5 parts of antioxidant; the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1; the modified nano-oxide raw material includes nano-titanium dioxide, nano-zinc dioxide, hydrogenated ricinoleic acid, and γ-aminopropyltriethoxysilane in a mass ratio of 5:3:0.05:0.02.

[0044] The flame retardant additive comprises the following raw materials in parts by weight: 23 parts diatomaceous earth, 20 parts magnesium hydroxide, 12 parts aluminum tripolyphosphate, 13 parts polyether-modified silicone oil, and 4 parts polydimethylsiloxane.

[0045] The modified nano-oxide is prepared by: mixing nano-titanium dioxide and hydrogenated ricinoleic acid at a stirring speed of 500 r / min for 5 min, then adding nano-zinc dioxide and continuing to mix for 5 min, and finally adding γ-aminopropyltriethoxysilane and mixing again at a stirring speed of 800 r / min for 9 min, and then drying to obtain the modified nano-oxide.

[0046] The flame retardant additive is prepared as follows: diatomaceous earth and magnesium hydroxide are stirred at 80°C and 700 r / min for 10 min to obtain a mixture. Then, polyether-modified silicone oil is added and stirred at 80°C and 800 r / min for 12 min to obtain a mixture. Next, aluminum tripolyphosphate is added and stirred at 80°C and 800 r / min for 8 min to obtain a mixture. Finally, polydimethylsiloxane is added and stirred at 80°C and 800 r / min for 10 min to obtain a flame retardant additive.

[0047] The preparation method of this low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0048] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide were mixed at high speed of 700 r / min for 5 min. Then, modified nano-oxide, flame retardant additives, and antioxidants were added and mixed again at high speed of 700 r / min for 10 min to obtain a mixed material.

[0049] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0050] Comparative Example 1

[0051] The difference between this comparative example and Example 3 is that the raw material ratio of the cable material has been changed, while the rest remains the same as Example 3.

[0052] The low-smoke halogen-free environmentally friendly cable material of this comparative example includes the following raw materials in parts by weight: 56 parts of ethylene-vinyl acetate copolymer, 16 parts of polyethylene resin, 9 parts of cellulose acetate, 7 parts of epoxidized soybean oil, 1 part of ethylene bis-stearamide, 9 parts of triethyl citrate, 7 parts of polyethylene glycol diacrylate, 9 parts of N-hydroxymethyl acrylamide, 4 parts of modified nano-oxide, 14 parts of flame retardant additive, and 0.5 parts of antioxidant.

[0053] Comparative Example 2

[0054] The difference between this comparative example and Example 3 is that the cable material does not contain modified nano-oxides, while the rest is the same as in Example 3.

[0055] The low-smoke halogen-free environmentally friendly cable material of this comparative example includes the following raw materials in parts by weight: 46 parts of ethylene-vinyl acetate copolymer, 28 parts of polyethylene resin, 16 parts of cellulose acetate, 3 parts of epoxidized soybean oil, 5 parts of ethylene bis-stearamide, 7 parts of triethyl citrate, 7 parts of polyethylene glycol diacrylate, 6 parts of N-hydroxymethyl acrylamide, 14 parts of flame retardant additive, and 0.5 parts of antioxidant.

[0056] The preparation method of this low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0057] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethylacrylamide were mixed at high speed of 700 r / min for 5 min. Then, flame retardant additives and antioxidants were added and the mixture was mixed again at high speed of 700 r / min for 10 min to obtain a mixed material.

[0058] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 3 is that the flame retardant additive contains only magnesium hydroxide, while the rest remains the same as in Example 3.

[0061] The low-smoke halogen-free environmentally friendly cable material of this embodiment includes the following raw materials in parts by weight: 46 parts of ethylene-vinyl acetate copolymer, 28 parts of polyethylene resin, 16 parts of cellulose acetate, 1 part of epoxidized soybean oil, 3 parts of ethylene bis-stearamide, 5 parts of triethyl citrate, 5 parts of polyethylene glycol diacrylate, 4 parts of N-hydroxymethyl acrylamide, 10 parts of modified nano-oxide, 14 parts of magnesium hydroxide, and 0.5 parts of antioxidant.

[0062] The preparation method of this low-smoke halogen-free environmentally friendly cable material includes the following steps:

[0063] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were mixed at high speed of 700 r / min for 5 min. Then, modified nano-oxide, magnesium hydroxide, and antioxidant were added and mixed again at high speed of 700 r / min for 10 min to obtain a mixed material.

[0064] (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried, and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

[0065] The low-smoke halogen-free environmentally friendly cable materials prepared in Examples 1-3 and Comparative Examples 1-3 were used for cable extrusion production. The tensile strength and elongation at break were determined according to GB / T 1040.1-2018, the oxygen index was tested according to GB / T2406.1-2008, and the smoke density was determined according to GB / T 8627-2007. The test results are shown in the table below.

[0066] Table 1. Test Performance Results of Low-Smoke Halogen-Free Environmentally Friendly Cable Materials

[0067] Experimental group Tensile strength / MPa Elongation at break / % Oxygen Index / % Smoke density / % Example 1 17.64 435.38 50.74 37.63 Example 2 17.83 438.17 51.69 38.27 Example 3 18.05 442.20 52.13 37.45 Comparative Example 1 15.36 404.87 49.52 40.16 Comparative Example 2 12.45 398.65 48.97 41.52 Comparative Example 3 16.18 412.72 40.63 48.61

[0068] The above results indicate that the cable materials of Examples 1-3 of this invention have a high limiting oxygen index (LOI) of 50.74%–52.13%, exhibiting high flame retardant properties, a smoke density of 37.45%–38.27%, and release less smoke during combustion. Furthermore, they possess high tensile strength and elongation at break, with a tensile strength of 17.64–18.05 MPa and an elongation at break of 435.38%–442.20%, demonstrating high mechanical strength and promising application prospects.

[0069] Compared with Example 3, Comparative Example 1 changed the raw material ratio of the cable material, resulting in the components in the raw materials failing to exert a good synergistic effect and thus reducing the overall effect. Compared with Example 3, the cable material of Comparative Example 2 did not contain modified nano-oxides, which led to a decrease in the tensile strength and elongation at break of the cable material. Compared with Example 3, the flame retardant additive of Comparative Example 3 only contained magnesium hydroxide, resulting in a decrease in flame retardant effect, increased smoke production, and a reduction in the mechanical properties of the cable material.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-smoke, halogen-free, environmentally friendly cable material, characterized in that, The raw materials include the following parts by weight: 40-48 parts of ethylene-vinyl acetate copolymer, 20-32 parts of polyethylene resin, 13-18 parts of cellulose acetate, 1-3 parts of epoxidized soybean oil, 2-5 parts of ethylene bis-stearamide, 2-5 parts of triethyl citrate, 3-6 parts of polyethylene glycol diacrylate, 3-6 parts of N-hydroxymethylacrylamide, 8-12 parts of modified nano-oxide, 13-18 parts of flame retardant additive, and 0.1-0.6 parts of antioxidant; The modified nano-oxide raw materials include nano-titanium dioxide, nano-zinc dioxide, hydrogenated ricinoleic acid, and γ-aminopropyltriethoxysilane in a mass ratio of 3-5:2-3:0.03-0.05:0.02-0.

03. The flame retardant additive comprises the following raw materials in parts by weight: 20-25 parts diatomaceous earth, 16-20 parts magnesium hydroxide, 9-13 parts aluminum tripolyphosphate, 9-13 parts polyether-modified silicone oil, and 3-5 parts polydimethylsiloxane.

2. The low-smoke halogen-free environmentally friendly cable material according to claim 1, characterized in that, The modified nano-oxide is prepared by: mixing nano-titanium dioxide and hydrogenated ricinoleic acid once, then adding nano-zinc dioxide and continuing to mix, and finally adding γ-aminopropyltriethoxysilane and mixing again, followed by drying to obtain the modified nano-oxide.

3. The low-smoke halogen-free environmentally friendly cable material according to claim 2, characterized in that, The stirring speed for the first mixing step is 300-500 r / min and the time is 5-7 min; the time for the continued mixing step is 3-5 min; and the time for the second mixing step is 800-1000 r / min and the time is 6-9 min.

4. The low-smoke halogen-free environmentally friendly cable material according to claim 1, characterized in that, The flame retardant additive is prepared by mixing diatomaceous earth and magnesium hydroxide to obtain a mixture, then adding polyether-modified silicone oil and mixing, then adding aluminum tripolyphosphate and mixing, and finally adding polydimethylsiloxane and mixing to obtain the flame retardant additive.

5. The low-smoke halogen-free environmentally friendly cable material according to claim 4, characterized in that, The mixing temperature is 70-80℃, the mixing speed is 600-800 r / min, and the mixing time is 8-15 min.

6. The low-smoke halogen-free environmentally friendly cable material according to claim 1, characterized in that, The antioxidant is one or more of antioxidant 1076, antioxidant 1010, and antioxidant 168.

7. The method for preparing the low-smoke halogen-free environmentally friendly cable material according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxidized soybean oil, ethylene bis-stearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide are mixed at high speed and then modified nano-oxide, flame retardant additives, and antioxidants are added and mixed at high speed again to obtain a mixed material. (2) The mixed materials are added to a twin-screw extruder for melting and extrusion. After extrusion, the materials are cooled, dried and pelletized to obtain low-smoke halogen-free environmentally friendly cable materials.

8. The method for preparing low-smoke halogen-free environmentally friendly cable material according to claim 7, characterized in that, The high-speed stirring speed is 700-800 r / min and the time is 5-10 min.