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

Abstract

The invention provides a low-smoke halogen-free environment-friendly cable material and a preparation method thereof. The invention discloses a cable material. Comprising the following raw materials in parts by weight: 40-48 parts of an ethylene-vinyl acetate copolymer, 20-32 parts of polyethylene resin, 13-18 parts of cellulose acetate fibers, 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-hydroxymethyl acrylamide, 8-12 parts of modified nano oxide and 13-18 parts of a flame retardant additive. And 0.1 to 0.6 part of an antioxidant. The cable material disclosed by the invention takes the ethylene-vinyl acetate copolymer, the polyethylene resin, the triethyl citrate, the polyethylene glycol diacrylate, the N-hydroxymethyl acrylamide, the modified nano oxide, the flame-retardant additive and the antioxidant as raw materials, and the tensile strength and the elongation at break of a cable can be effectively improved through the synergistic interaction of the raw materials; the halogen-free flame-retardant cable material does not contain halogen raw materials, has a relatively high flame-retardant effect, releases relatively low smoke during combustion, and has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of cable materials, and in particular to a low-smoke, halogen-free and environmentally friendly cable material and a preparation method thereof. Background Art

[0002] Cables are the carriers of communication and power transmission. With the rapid development of various sectors in my country, cables have been widely used in power, construction, transportation, communications, and transportation. Therefore, cables must possess flame retardancy, insulation, heat resistance, aging resistance, and radiation resistance. Traditional cables have long been made primarily of halogen-containing polymers such as chloroprene rubber, polyvinyl chloride, and chlorosulfonated polyethylene. While these materials offer excellent flame retardancy, they release significant amounts of harmful gases and smoke, posing serious health risks and hindering firefighting and rescue efforts. Therefore, low-smoke, halogen-free, flame-retardant, and environmentally friendly cables with excellent insulation and flame retardancy have become a hot topic of research and development in the cable industry. Currently, the production of low-smoke, halogen-free cables primarily involves adding large amounts of materials such as aluminum hydroxide and magnesium hydroxide to polyolefins to achieve flame retardancy. However, while the addition of these inorganic materials can achieve flame retardancy, it compromises the cable's tensile strength, aging resistance, and other properties, shortening the service life of these environmentally friendly, low-smoke, halogen-free cables. Summary of the Invention

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

[0004] The technical solution of the present invention is achieved as follows:

[0005] A low-smoke, halogen-free, and 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 epoxy soybean oil, 2-5 parts of ethylene bisstearamide, 2-5 parts of triethyl citrate, 3-6 parts of polyethylene glycol diacrylate, 3-6 parts of N-hydroxymethyl acrylamide, 8-12 parts of modified nano-oxide, 13-18 parts of flame retardant additive, and 0.1-0.6 parts of antioxidant.

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

[0007] Furthermore, the preparation method of the modified nano-oxide is: stirring and mixing nano-titanium dioxide and hydrogenated ricinoleic acid, then adding nano-zinc dioxide and continuing to stir and mix, and finally adding γ-aminopropyltriethoxysilane and stirring and mixing again, and drying to obtain the modified nano-oxide.

[0008] Furthermore, the stirring speed of the first stirring and mixing is 300-500 r / min and the time is 5-7 min; the time of the continued stirring and mixing is 3-5 min; the stirring speed of the second stirring and mixing 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 of diatomaceous earth, 16-20 parts of magnesium hydroxide, 9-13 parts of aluminum tripolyphosphate, 9-13 parts of polyether modified silicone oil, and 3-5 parts of polydimethylsiloxane.

[0010] Furthermore, the flame retardant additive is prepared by stirring and mixing diatomaceous earth and magnesium hydroxide to obtain a mixture, then adding polyether-modified silicone oil and stirring and mixing, then adding aluminum tripolyphosphate and stirring and mixing, and finally adding polydimethylsiloxane and stirring and mixing to obtain the flame retardant additive.

[0011] Furthermore, the stirring and mixing temperature is 70-80° C., the stirring speed is 600-800 r / min, and the 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 comprises the following steps:

[0014] (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide at high speed, and then adding modified nano-oxide, flame retardant additive, and antioxidant and stirring again at high speed to obtain a mixed material;

[0015] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[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 present invention has the following beneficial effects:

[0018] The cable material of the present invention uses ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, N-hydroxymethyl acrylamide, modified nano-oxide, flame retardant additives, and antioxidants as raw materials. Through the synergistic effect of various raw materials, the tensile strength and elongation at break of the cable can be effectively improved. The cable material does not contain halogen raw materials, has a high flame retardant effect, and releases low smoke during combustion, thereby having good application prospects.

[0019] The cable material of the present invention can improve the interface compatibility between organic and inorganic raw materials through the synergistic effect of raw materials such as epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide, thereby effectively improving the processing properties such as strength, hardness, and density of the cable material.

[0020] The present invention adds modified nano-oxides to the cable material, and adopts hydrogenated ricinoleic acid and γ-aminopropyltriethoxysilane to modify the nano-oxides, thereby effectively improving the interface compatibility between the nano-oxides and raw materials such as ethylene-vinyl acetate copolymer and polyethylene resin, and enhancing the penetration and bonding force of the nano-oxides. The nano-oxides can be stably filled into the gaps of raw materials such as ethylene-vinyl acetate copolymer and polyethylene resin, effectively improving the processing properties such as strength, hardness and density of the cable material, and the nano-oxides also have certain anti-aging properties, and can extend the aging resistance of the cable.

[0021] The present invention uses diatomaceous earth, magnesium hydroxide, aluminum tripolyphosphate, polyether modified silicone oil, and polydimethylsiloxane as raw materials to prepare a flame retardant additive, so that the flame retardant additive can form a dense carbon layer when burned, blocking combustible gas and oxygen, and having an effective flame retardant effect. At the same time, it can also be effectively integrated with other raw materials, further improving the mechanical properties of the cable material. DETAILED DESCRIPTION

[0022] In order to better understand the technical content of the present invention, specific examples are provided below to further illustrate the present invention.

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

[0024] Unless otherwise specified, the materials, reagents, etc. used in the examples of the present invention can be obtained from commercial sources.

[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 epoxy soybean oil, 4 parts of ethylene bisstearamide, 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 additives, 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 ricinoleic acid and gamma-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 of diatomaceous earth, 16 parts of magnesium hydroxide, 9 parts of aluminum tripolyphosphate, 10 parts of polyether modified silicone oil, and 3 parts of polydimethylsiloxane.

[0029] The preparation method of the modified nano-oxide is 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 the stirring is continued for 3 minutes, and finally γ-aminopropyltriethoxysilane is added and the stirring is again stirred and mixed for 7 minutes at a stirring speed of 900 r / min, and 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 a temperature of 75°C and a stirring speed of 800 r / min for 10 minutes to obtain a mixture, then polyether modified silicone oil is added and stirred at a temperature of 75°C and a stirring speed of 800 r / min for 8 minutes to obtain a mixture, then aluminum tripolyphosphate is added and stirred at a temperature of 75°C and a stirring speed of 800 r / min for 10 minutes to obtain a mixture, and finally polydimethylsiloxane is added and stirred at a temperature of 75°C and a stirring speed of 800 r / min for 12 minutes to obtain a flame retardant additive.

[0031] The method for preparing the low-smoke halogen-free environmentally friendly cable material comprises the following steps:

[0032] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were stirred at a speed of 760 r / min for 10 minutes to obtain a mixed material, and then modified nano-oxide, flame retardant additive, and antioxidant were added and stirred at a speed of 800 r / min for 8 minutes to obtain a mixed material;

[0033] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[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 epoxy soybean oil, 5 parts of ethylene bisstearamide, 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 part of antioxidant; the antioxidant is antioxidant 1010; the modified nano-oxide raw materials include nano-titanium dioxide, nano-zinc dioxide, hydrogenated ricinoleic acid, and γ-aminopropyltriethoxysilane in a mass ratio of 3:2:0.04:0.03.

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

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

[0038] The flame retardant additive is prepared by: stirring diatomaceous earth and magnesium hydroxide at a temperature of 70° C. and a stirring speed of 600 r / min for 8 minutes to obtain a mixture, then adding polyether-modified silicone oil and stirring at a temperature of 70° C. and a stirring speed of 600 r / min for 10 minutes to obtain a mixture, then adding aluminum tripolyphosphate and stirring at a temperature of 70° C. and a stirring speed of 600 r / min for 12 minutes to obtain a mixture, and finally adding polydimethylsiloxane and stirring at a temperature of 70° C. and a stirring speed of 700 r / min for 13 minutes to obtain a flame retardant additive.

[0039] The method for preparing the low-smoke halogen-free environmentally friendly cable material comprises the following steps:

[0040] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were stirred at a speed of 700 r / min for 8 minutes to mix, and then modified nano-oxide, flame retardant additive, and antioxidant were added and stirred at a speed of 750 r / min for 9 minutes to obtain a mixed material;

[0041] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[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 epoxy soybean oil, 3 parts of ethylene bisstearamide, 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 part of antioxidant; the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1; the modified nano-oxide raw materials include 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 of diatomaceous earth, 20 parts of magnesium hydroxide, 12 parts of aluminum tripolyphosphate, 13 parts of polyether modified silicone oil, and 4 parts of polydimethylsiloxane.

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

[0046] The preparation method of the flame retardant additive comprises the following steps: stirring diatomaceous earth and magnesium hydroxide at a temperature of 80° C. and a stirring speed of 700 r / min for 10 minutes to obtain a mixture; then adding polyether-modified silicone oil and stirring at a temperature of 80° C. and a stirring speed of 800 r / min to obtain a mixture; then adding aluminum tripolyphosphate and stirring at a temperature of 80° C. and a stirring speed of 800 r / min to obtain a mixture; and finally adding polydimethylsiloxane and stirring at a temperature of 80° C. and a stirring speed of 800 r / min to obtain a mixture to obtain the flame retardant additive.

[0047] The method for preparing the low-smoke halogen-free environmentally friendly cable material comprises the following steps:

[0048] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were stirred at a speed of 700 r / min for 5 minutes to mix, and then modified nano-oxide, flame retardant additive, and antioxidant were added and stirred at a speed of 700 r / min for 10 minutes to obtain a mixed material;

[0049] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[0050] Comparative Example 1

[0051] The difference between this comparative example and Example 3 is that the raw material ratio of the cable material is changed, and the rest is consistent with 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 epoxy soybean oil, 1 part of ethylene bisstearamide, 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 additives, 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, and the rest is consistent with 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 epoxy soybean oil, 5 parts of ethylene bisstearamide, 7 parts of triethyl citrate, 7 parts of polyethylene glycol diacrylate, 6 parts of N-hydroxymethyl acrylamide, 14 parts of flame retardant additives, and 0.5 parts of antioxidant.

[0056] The method for preparing the low-smoke halogen-free environmentally friendly cable material comprises the following steps:

[0057] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were stirred at a speed of 700 r / min for 5 minutes to mix, and then a flame retardant additive and an antioxidant were added and stirred at a speed of 700 r / min for 10 minutes to obtain a mixed material;

[0058] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 3 is that the flame retardant additive only contains magnesium hydroxide, and the rest is consistent with 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 epoxy soybean oil, 3 parts of ethylene bisstearamide, 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 method for preparing the low-smoke halogen-free environmentally friendly cable material comprises the following steps:

[0063] (1) Ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide were stirred at a speed of 700 r / min for 5 minutes to mix, and then modified nano-oxide, magnesium hydroxide, and antioxidant were added and stirred at a speed of 700 r / min for 10 minutes to obtain a mixed material;

[0064] (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

[0065] The low-smoke halogen-free environmentally friendly cable materials prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to cable extrusion production. The tensile strength and elongation at break were measured according to GB / T 1040.1-2018, the oxygen index was tested according to GB / T 2406.1-2008, and the smoke density was measured according to GB / T 8627-2007. The test results are shown in the following table.

[0066] Table 1 Test performance of low smoke halogen-free environmentally friendly cable materials

[0067] Experimental groups 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 show that the cable materials of Examples 1-3 of the present invention have a high limiting oxygen index (LOI) of 50.74% to 52.13%, demonstrating a strong flame retardant effect. Their smoke density ranges from 37.45% to 38.27%, resulting in low smoke release during combustion. Furthermore, they have 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% to 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 ingredients in the raw materials not being able to achieve a good synergistic effect, and the effect was reduced. Compared with Example 3, the cable material of Comparative Example 2 did not contain modified nano-oxides, resulting in a decrease in the tensile strength and elongation at break of the cable material. Compared with Example 3, the flame retardant additive in Comparative Example 3 contained only magnesium hydroxide, which reduced the flame retardant effect, generated more smoke, and reduced 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 in the scope of protection of the present invention.

Claims

1. A low-smoke, halogen-free, environmentally friendly cable material, characterized in that: The invention 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 epoxy soybean oil, 2-5 parts of ethylene bisstearamide, 2-5 parts of triethyl citrate, 3-6 parts of polyethylene glycol diacrylate, 3-6 parts of N-hydroxymethyl acrylamide, 8-12 parts of modified nano-oxide, 13-18 parts of flame retardant additive and 0.1-0.6 parts of antioxidant.

2. The low-smoke, halogen-free, environmentally friendly cable material according to claim 1, characterized in that: The modified nano-oxide raw materials include nano-titanium dioxide, nano-zinc dioxide, hydrogenated ricinoleic acid and gamma-aminopropyltriethoxysilane in a mass ratio of 3-5:2-3:0.03-0.05:0.02-0.

03.

3. The low-smoke halogen-free environmentally friendly cable material according to claim 2, characterized in that: The preparation method of the modified nano-oxide is as follows: nano-titanium dioxide and hydrogenated ricinoleic acid are stirred and mixed once, nano-zinc dioxide is added and stirred and mixed continuously, and gamma-aminopropyltriethoxysilane is added and stirred and mixed again, and dried to obtain the modified nano-oxide.

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

5. The low-smoke, halogen-free, environmentally friendly cable material according to claim 1, characterized in that: The flame retardant additive comprises the following raw materials in parts by weight: 20-25 parts of diatomaceous earth, 16-20 parts of magnesium hydroxide, 9-13 parts of aluminum tripolyphosphate, 9-13 parts of polyether modified silicone oil, and 3-5 parts of polydimethylsiloxane.

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

7. The low-smoke, halogen-free, environmentally friendly cable material according to claim 6, characterized in that: The stirring and mixing temperature is 70-80° C., the stirring speed is 600-800 r / min, and the time is 8-15 min.

8. 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.

9. The method for preparing the low-smoke halogen-free environmentally friendly cable material according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, cellulose acetate, epoxy soybean oil, ethylene bisstearamide, triethyl citrate, polyethylene glycol diacrylate, and N-hydroxymethyl acrylamide at high speed, and then adding modified nano-oxide, flame retardant additive, and antioxidant and stirring again at high speed to obtain a mixed material; (2) The mixed material is added to a twin-screw extruder for melting, conveying and extruding, and then cooled, dried and pelletized after extrusion to obtain a low-smoke, halogen-free and environmentally friendly cable material.

10. The method for preparing the low-smoke halogen-free environmentally friendly cable material according to claim 9, characterized in that: The high-speed stirring speed is 700-800 r / min and the time is 5-10 min.