Low-smoke halogen-free flame-retardant cable material and preparation method thereof

Abstract

The invention relates to the technical field of cable materials, and particularly discloses a low-smoke halogen-free flame-retardant cable material and a preparation method thereof. The low-smoke halogen-free flame-retardant cable material is prepared from 100 parts of polyolefin blended resin, 10 to 20 parts of polyphenyl ether, 3 to 8 parts of glycidyl methacrylate grafted POE, 1 to 3 parts of hyperbranched polyesteramide, 50 to 80 parts of a flame retardant, 5 to 15 parts of silicone powder, 0.5 to 1.5 parts of an antioxidant and 0.05 to 0.2 part of an organic zirconium compound. The preparation method comprises the following steps: uniformly mixing the raw materials to obtain a mixture; and adding the mixture into a twin-screw extruder, carrying out melt extrusion by the twin-screw extruder, cooling, granulating, and drying to obtain the low-smoke halogen-free flame-retardant cable material. The mechanical property and temperature resistance of the low-smoke halogen-free flame-retardant cable material can be improved.

Description

Technical Field

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

[0002] With the rapid development of power, communications, rail transit, and other fields, cables, as key transmission media, are facing increasing safety and environmental protection requirements. Traditional cable materials often use halogenated flame retardants. While these agents effectively improve flame retardancy, they produce large amounts of toxic smoke and corrosive gases during combustion, posing serious risks to personnel escape, equipment safety, and the environment.

[0003] In the related art, a silane cross-linked low-smoke halogen-free flame-retardant polyolefin cable material is disclosed, which is composed of a base material and a catalyst masterbatch in a weight ratio of 100:3-5; wherein the components of the base material and the weight ratio of each component are: 100 parts by weight of polyolefin resin; 150 parts by weight of flame retardant; 1-3 parts by weight of lubricant; 0.1-0.2 parts by weight of antioxidant; 2-4 parts by weight of silane; 0.1-1.0 parts by weight of initiator; the components of the catalyst masterbatch and the weight ratio of each component are: 100 parts by weight of polyolefin resin; 150 parts by weight of flame retardant; 1-5 parts by weight of lubricant; 5-15 parts by weight of antioxidant; 2-10 parts by weight of catalyst.

[0004] However, while polyolefin resins offer excellent flexibility, their long-term operating temperature is typically below 90°C, and their low mechanical strength makes them difficult to meet the mechanical and temperature resistance requirements of cable sheaths. Furthermore, the poor compatibility of stearic acid with PE wax and the weak interfacial bonding between inorganic flame retardants and polyolefin resins further contribute to the poor mechanical properties of these cable materials. Summary of the Invention

[0005] In order to improve the mechanical properties and temperature resistance of low-smoke halogen-free flame retardant cable materials, the present application provides a low-smoke halogen-free flame retardant cable material and a preparation method thereof.

[0006] In the first aspect, the present application provides a low-smoke halogen-free flame-retardant cable material, which adopts the following technical solution:

[0007] A low-smoke, halogen-free, flame-retardant cable material comprises the following raw materials in parts by weight: 100 parts of a polyolefin blend resin, 10-20 parts of polyphenylene ether, 3-8 parts of glycidyl methacrylate grafted POE, 1-3 parts of a hyperbranched polyester amide, 50-80 parts of a flame retardant, 5-15 parts of silicone powder, 0.5-1.5 parts of an antioxidant, and 0.05-0.2 parts of an organic zirconium compound.

[0008] By adopting the above technical solution, polyphenylene ether and polyolefin blended resin can form an island structure, providing a high flexural modulus. Glycidyl methacrylate grafted POE has elastomeric properties and epoxy group reactivity, which can inhibit crack propagation and provide high impact strength. The amino groups of the hyperbranched polyester amide cross-link with the epoxy groups of the glycidyl methacrylate grafted POE, thereby improving tensile strength. The terminal amino groups of the hyperbranched polyester amide can react with the hydroxyl groups on the surface of the flame retardant. At the same time, its branched chains can wrap around the resin matrix, helping to improve the interfacial bonding effect between the flame retardant and the resin, thereby improving the material uniformity of the cable material. Therefore, by blending polyolefin resin, polyphenylene ether, glycidyl methacrylate grafted POE and hyperbranched polyester amide, the mechanical properties of the cable material can be improved.

[0009] Furthermore, because polyphenylene ether has a higher heat deformation temperature than polyolefins, when polyphenylene ether and antioxidants work synergistically, they can inhibit thermal oxidative degradation, thereby improving the temperature resistance of the cable material. Silicone powder not only has char-forming and synergistic flame-retardant properties, but can also migrate to the surface of inorganic materials during the preparation of cable materials, reducing interfacial energy and further improving the interfacial bonding between the inorganic material and the resin. Organic zirconium compounds act as catalysts, catalyzing the efficient cross-linking of the various components. Therefore, by adopting the above-mentioned raw material ratio, this application can improve the mechanical properties and temperature resistance of low-smoke, halogen-free, flame-retardant cable materials.

[0010] In a specific embodiment, based on the total weight of the polyolefin blended resin, the polyolefin blended resin includes 40-60 parts of HDPE, 30-40 parts of EVA, 5-10 parts of SEBS-g-MAH, 1-3 parts of nanocellulose, and 10-15 parts of synthetic mica powder.

[0011] By adopting this technical solution, HDPE provides a rigid and heat-resistant backbone, while EVA provides flexibility, balancing the rigidity and flexibility of the polyolefin blend. SEBS-g-MAH enhances the interfacial compatibility between the resin and filler, promoting a more uniform dispersion of the nanocellulose and synthetic mica powder. The nanocellulose and HDPE rigid segments interpenetrate to form a three-dimensional network, within which the synthetic mica powder is dispersed. This network enhances the mechanical strength of the polyolefin blend and, at high temperatures, forms a dense barrier layer, thereby improving the heat resistance of the polyolefin blend. Therefore, using this raw material ratio in a polyolefin resin can further improve the mechanical properties and heat resistance of cable materials.

[0012] In a specific embodiment, the low-smoke halogen-free flame-retardant cable material further comprises a multifunctional epoxy resin.

[0013] By employing this technical solution, the multifunctional epoxy resin reacts with the resin matrix and compatibilizer to form a multi-chemical bond network, thereby increasing the crosslink density and heat distortion temperature, thereby improving the temperature resistance of the cable material. The multifunctional epoxy resin also synergizes with silicone powder to promote the formation of a dense carbon layer, thereby improving the flame retardancy of the cable material.

[0014] In a specific embodiment, the low-smoke halogen-free flame-retardant cable material further includes polyethylene wax.

[0015] By adopting the above technical solution, during the preparation of cable materials, polyethylene wax can migrate to the surface of the melt to form a lubricating layer, reducing the adhesion between the material and the mold, helping to reduce surface defects of the extruded cable materials and cable material products, and further improving the mechanical properties of the cable materials.

[0016] In a specific embodiment, the flame retardant includes magnesium hydroxide, aluminum hydroxide and phosphorus nitrogen intumescent flame retardant in a weight ratio of (14-18): (7-9): 1.

[0017] By employing this technical solution, aluminum hydroxide absorbs heat during the initial combustion phase, releasing water vapor to dilute the combustible gases and delay ignition. Magnesium hydroxide continues to absorb heat at high temperatures, forming a MgO coating that inhibits flame spread. The phosphorus-nitrogen intumescent flame retardant catalyzes the dehydration of the resin into carbon, forming an intumescent carbon layer that isolates oxygen and heat. These three components work together to provide flame resistance across the entire temperature range of 200°C to 400°C, and they also form a "ceramic-carbon" composite structure to enhance flame retardancy.

[0018] In a specific embodiment, the antioxidant includes at least one of antioxidant 1010 and antioxidant 168 .

[0019] By employing this technical solution, Antioxidant 1010 provides long-lasting protection by donating hydrogen to capture free radicals, terminating the oxidation chain reaction. Antioxidant 168 decomposes hydroperoxides into stable alcohols, blocking oxidative side reactions and helping to inhibit initial oxidation.

[0020] In a second aspect, the present application provides a method for preparing a low-smoke halogen-free flame-retardant cable material, which adopts the following technical solution:

[0021] A method for preparing a low-smoke halogen-free flame-retardant cable material comprises the following steps:

[0022] The polyolefin blend resin, polyphenylene ether, glycidyl methacrylate grafted POE, hyperbranched polyester amide, silicone powder, flame retardant, antioxidant and organic zirconium compound are uniformly mixed to obtain a mixture;

[0023] The mixture is added to a twin-screw extruder, and the temperature of each section of the twin-screw extruder is as follows: feeding section 160-170°C, compression section 180-190°C, melting section 190-210°C, and die head 200-210°C; after the mixture is melted and extruded through the twin-screw extruder, it is cooled, pelletized, and dried to obtain a low-smoke, halogen-free, flame-retardant cable material.

[0024] By adopting the above technical solution, the feeding section at 160-170°C can initially soften the resin, avoid premature melting and bonding of the resin, and ensure stable material feeding. The flame retardant does not reach the decomposition threshold at this stage, avoiding foaming. The compression section at 180-190°C allows the resin to initially melt and remove volatiles. At this temperature, the organic zirconium slowly initiates the cross-linking reaction. The melting section at 190-210°C can completely melt the resin and achieve chemical bonding between the components. The die head at 200-210°C can maintain melt fluidity and stable extrusion molding. Therefore, the above method can be used to successfully prepare low-smoke halogen-free flame-retardant cable materials.

[0025] In a specific embodiment, the preparation method of the polyolefin blend resin comprises the following steps:

[0026] HDPE, EVA, and SEBS-g-MAH are dried to a moisture content of ≤0.1% and then mixed, and nanocellulose and synthetic mica powder are added and mixed evenly to obtain a premix;

[0027] The premix is ​​added to a twin-screw extruder, and the temperature of each section of the twin-screw extruder is as follows: feeding section 160-170°C, compression section 180-190°C, melting section 195-205°C, and die head 190-200°C; the premix is ​​melt-extruded through the twin-screw extruder, cooled, pelletized, and dried to obtain a polyolefin blended resin.

[0028] By adopting the above technical solution, pre-drying can eliminate bubbles caused by water volatilization, avoid hydrolysis reaction, and thus prevent processing defects. Under the process conditions of the above extruder, polyolefin blended resin can be stably prepared.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. This application uses raw materials such as polyolefin blended resin, polyphenylene ether, glycidyl methacrylate grafted POE, hyperbranched polyester amide, silicone powder, etc. to improve the mechanical properties and temperature resistance of low-smoke halogen-free flame retardant cable materials.

[0031] 2. In this application, the polyolefin blended resin, multifunctional epoxy resin and polyethylene wax prepared with a specific raw material ratio are preferably used, which helps to further improve the mechanical properties and temperature resistance of the low-smoke halogen-free flame retardant cable material.

[0032] 3. The method of the present application can stably feed and extrusion-form, and smoothly prepare low-smoke halogen-free flame-retardant cable materials. DETAILED DESCRIPTION

[0033] The present application is further described in detail below with reference to the following examples and comparative examples.

[0034] Example

[0035] Example 1

[0036] This embodiment provides a low-smoke halogen-free flame-retardant cable material, using the following raw materials in parts by weight: 100 kg of polyolefin blend resin (Arkema 18MA02), 15 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 5 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 2 kg of hyperbranched polyester amide (Maidehao MDH25410), 65 kg of aluminum hydroxide, 10 kg of silicone powder (Yinyuan SR-402), 1 kg of antioxidant (antioxidant 1010), and 0.12 kg of organic zirconium compound (Dofukate Unilink 1020).

[0037] This embodiment also provides a method for preparing a low-smoke halogen-free flame-retardant cable material, which comprises the following steps:

[0038] Add polyolefin blended resin, polyphenylene ether, glycidyl methacrylate grafted POE, hyperbranched polyester amide, silicone powder, aluminum hydroxide, antioxidant and organic zirconium compound into a high-speed mixer, and mix at 500-800 rpm for 3 minutes to obtain a mixture.

[0039] The mixture was added to a twin-screw extruder. The temperatures of each section of the twin-screw extruder were as follows: 160-170°C for the feeding section, 180-190°C for the compression section, 190-210°C for the melting section, and 200-210°C for the die. The screw speed was 300 rpm. After the mixture was melted and extruded through the twin-screw extruder, it was cooled in a 50°C water tank. After cooling, it was pelletized and dried at 80°C for 3 hours to obtain a low-smoke halogen-free flame-retardant cable material.

[0040] Example 2

[0041] The only difference between this embodiment and Example 1 is that the low-smoke halogen-free flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blend resin (Arkema 18MA02), 10 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 3 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 1 kg of hyperbranched polyester amide (Maidehao MDH25410), 50 kg of aluminum hydroxide, 5 kg of silicone powder (Yinyuan SR-402), 0.5 kg of antioxidant (antioxidant 1010), and 0.05 kg of organic zirconium compound (Dofukate Unilink 1020).

[0042] Example 3

[0043] The only difference between this embodiment and Example 1 is that the low-smoke halogen-free flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blended resin (Arkema 18MA02), 20 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 8 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 3 kg of hyperbranched polyester amide (Maidehao MDH25410), 80 kg of aluminum hydroxide, 15 kg of silicone powder (Yinyuan SR-402), 1.5 kg of antioxidant (antioxidant 1010), and 0.2 kg of organic zirconium compound (Dofukate Unilink 1020).

[0044] Example 4

[0045] The only difference between this embodiment and embodiment 1 is that the polyolefin blended resin of this embodiment is prepared according to the following preparation method:

[0046] The polyolefin blended resin uses the following raw materials: 50 kg of HDPE (INEOS J60-1700-173), 35 kg of EVA (Mitsui Chemicals 260), 7 kg of SEBS-g-MAH (Hengtai Plastics HT-025), 2 kg of nanocellulose (Kangqiong kq-051), and 13 kg of synthetic mica powder (Baijiang fluorophlogopite powder, 1250 mesh).

[0047] HDPE, EVA, and SEBS-g-MAH are dried to a moisture content of ≤0.1% and then added into a high-speed mixer. After being mixed evenly, nanocellulose and synthetic mica powder are added and mixed until uniform to obtain a premix.

[0048] The premix was added to a twin-screw extruder. The temperatures of each section of the twin-screw extruder were as follows: 160-170°C in the feeding section, 180-190°C in the compression section, 195-205°C in the melting section, and 190-200°C in the die head. The screw speed was 300 rpm. After the premix was melted and extruded through the twin-screw extruder, it was cooled in a 30°C water tank, pelletized, and dried at 60°C to obtain a polyolefin blended resin.

[0049] Example 5

[0050] The only difference between this embodiment and Example 4 is that the polyolefin blended resin uses the following raw materials: 40 kg of HDPE (INEOS J60-1700-173), 30 kg of EVA (Mitsui Chemicals 260), 5 kg of SEBS-g-MAH (Hengtai Plastic HT-025), 1 kg of nanocellulose (Kangqiong kq-051), and 10 kg of synthetic mica powder (Baijiang fluorophlogopite powder, 1250 mesh).

[0051] Example 6

[0052] The only difference between this embodiment and Example 4 is that the polyolefin blended resin uses the following raw materials: 60 kg of HDPE (INEOS J60-1700-173), 40 kg of EVA (Mitsui Chemicals 260), 10 kg of SEBS-g-MAH (Hengtai Plastic HT-025), 3 kg of nanocellulose (Kangqiong kq-051), and 15 kg of synthetic mica powder (Baijiang fluorophlogopite powder, 1250 mesh).

[0053] Example 7

[0054] The only difference between this embodiment and embodiment 1 is that aluminum hydroxide is replaced by an equal amount of flame retardant, and the flame retardant includes magnesium hydroxide, aluminum hydroxide and phosphorus nitrogen intumescent flame retardant (model ST-FR-8300) in a weight ratio of 16:8:1.

[0055] Example 8

[0056] The only difference between this embodiment and embodiment 1 is that aluminum hydroxide is replaced by an equal amount of flame retardant, and the flame retardant includes magnesium hydroxide, aluminum hydroxide and phosphorus nitrogen intumescent flame retardant (model ST-FR-8300) in a weight ratio of 14:9:1.

[0057] Example 9

[0058] The only difference between this embodiment and embodiment 1 is that aluminum hydroxide is replaced by an equal amount of flame retardant, and the flame retardant includes magnesium hydroxide, aluminum hydroxide and phosphorus nitrogen intumescent flame retardant (model ST-FR-8300) in a weight ratio of 18:7:1.

[0059] Example 10

[0060] The only difference between this embodiment and embodiment 1 is that the antioxidant 1010 is replaced by an equal amount of antioxidant 168 .

[0061] Example 11

[0062] The only difference between this embodiment and Example 1 is that the low-smoke halogen-free flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blend resin (Arkema 18MA02), 15 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 5 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 2 kg of hyperbranched polyester amide (Maidehao MDH25410), 65 kg of aluminum hydroxide, 10 kg of silicone powder (Yinyuan SR-402), 1 kg of antioxidant (antioxidant 1010), 0.12 kg of organic zirconium compound (Dofukate Unilink 1020), and 7 kg of multifunctional epoxy resin (Langbowan MY-0500).

[0063] Example 12

[0064] The only difference between this embodiment and Example 1 is that the low-smoke halogen-free flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blend resin (Arkema 18MA02), 15 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 5 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 2 kg of hyperbranched polyester amide (Maidehao MDH25410), 65 kg of aluminum hydroxide, 10 kg of silicone powder (Yinyuan SR-402), 1 kg of antioxidant (antioxidant 1010), 0.12 kg of organic zirconium compound (Dofukate Unilink 1020), and 7 kg of polyethylene wax (LP0020P).

[0065] Example 13

[0066] The only difference between this embodiment and Example 1 is that the low-smoke halogen-free flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blend resin (Arkema 18MA02), 15 kg of polyphenylene ether (Asahi Kasei 340Z of Japan), 5 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 2 kg of hyperbranched polyester amide (Maidehao MDH25410), 65 kg of aluminum hydroxide, 10 kg of silicone powder (Yinyuan SR-402), 1 kg of antioxidant (antioxidant 1010), 0.12 kg of organic zirconium compound (Dofukate Unilink 1020), 7 kg of multifunctional epoxy resin (Langbowan MY-0500), and 7 kg of polyethylene wax (LP0020P).

[0067] Example 14

[0068] The only difference between this embodiment and embodiment 1 is that the low-smoke, halogen-free, flame-retardant cable material uses the following raw materials in parts by weight: 100 kg of polyolefin blend resin, 15 kg of polyphenylene ether (Asahi Kasei 340Z), 5 kg of glycidyl methacrylate grafted POE (Jiayirong SOG-02), 2 kg of hyperbranched polyester amide (Maidehao MDH25410), 65 kg of flame retardant, 10 kg of silicone powder (Yinyuan SR-402), 1 kg of antioxidant (Antioxidant 1010), 0.12 kg of organic zirconium compound (Dofukate Unilink 1020), 7 kg of multifunctional epoxy resin (Langbowan MY-0500), and 7 kg of polyethylene wax (LP0020P). The flame retardant includes magnesium hydroxide, aluminum hydroxide, and a phosphorus-nitrogen intumescent flame retardant (model ST-FR-8300) in a weight ratio of 16:8:1.

[0069] The polyolefin blend resin is prepared by the following preparation method:

[0070] The polyolefin blended resin uses the following raw materials: 50 kg of HDPE (INEOS J60-1700-173), 35 kg of EVA (Mitsui Chemicals 260), 7 kg of SEBS-g-MAH (Hengtai Plastics HT-025), 2 kg of nanocellulose (Kangqiong kq-051), and 13 kg of synthetic mica powder (Baijiang fluorophlogopite powder, 1250 mesh).

[0071] HDPE, EVA, and SEBS-g-MAH are dried to a moisture content of ≤0.1% and then added into a high-speed mixer. After being mixed evenly, nanocellulose and synthetic mica powder are added and mixed until uniform to obtain a premix.

[0072] The premix was added to a twin-screw extruder. The temperatures of each section of the twin-screw extruder were as follows: 160-170°C in the feeding section, 180-190°C in the compression section, 195-205°C in the melting section, and 190-200°C in the die head. The screw speed was 300 rpm. After the premix was melted and extruded through the twin-screw extruder, it was cooled in a 30°C water tank, pelletized, and dried at 60°C to obtain a polyolefin blended resin.

[0073] The preparation method of low-smoke halogen-free flame-retardant cable material adopts the following steps:

[0074] Add polyolefin blended resin, polyphenylene ether, glycidyl methacrylate grafted POE, hyperbranched polyester amide, silicone powder, flame retardant, antioxidant and organic zirconium compound into a high-speed mixer, and mix at 500-800 rpm for 3 minutes to obtain a mixture.

[0075] The mixture was added to a twin-screw extruder. The temperatures of each section of the twin-screw extruder were as follows: 160-170°C for the feeding section, 180-190°C for the compression section, 190-210°C for the melting section, and 200-210°C for the die. The screw speed was 300 rpm. After the mixture was melted and extruded through the twin-screw extruder, it was cooled in a 50°C water tank. After cooling, it was pelletized and dried at 80°C for 3 hours to obtain a low-smoke halogen-free flame-retardant cable material.

[0076] Comparative Example

[0077] Comparative Example 1

[0078] The only difference between this comparative example and Example 1 is that an equal amount of polyolefin blended resin is used to replace polyphenylene ether.

[0079] Comparative Example 2

[0080] The only difference between this comparative example and Example 1 is that the glycidyl methacrylate grafted POE is replaced by an equal amount of polyolefin blended resin.

[0081] Comparative Example 3

[0082] The only difference between this comparative example and Example 1 is that the hyperbranched polyester amide is replaced by an equal amount of polyolefin blended resin.

[0083] Comparative Example 4

[0084] The only difference between this comparative example and Example 1 is that the silicone powder is replaced by an equal amount of aluminum hydroxide.

[0085] Performance testing

[0086] For Examples 1-14 and Comparative Examples 1-4, the following performance tests were performed:

[0087] According to ASTM D638 “Standard Test Method for Tensile Properties of Plastics”, the tensile strength of the low-smoke halogen-free flame retardant cable materials of the embodiments and comparative examples was tested.

[0088] According to ISO 527 “Plastics—Determination of tensile properties”, the elongation at break of the low-smoke halogen-free flame retardant cable material of each embodiment and comparative example was tested.

[0089] According to ASTM D648 “Standard Test Method for Heat Deflection Temperature of Plastics under Bending Load”, the heat deformation temperature (HDT, °C) of the low-smoke halogen-free flame-retardant cable materials of various embodiments and comparative examples was tested.

[0090] According to the UL 94 vertical burning test, the flame retardant grade of the low-smoke halogen-free flame retardant cable material of each embodiment and comparative example was tested.

[0091] The test results are shown in Table 1.

[0092] Table 1

[0093]

[0094] Combining Example 1 with Comparative Examples 1-4 and Table 1, it can be seen that compared to Example 1, the tensile strength and elongation at break of Comparative Examples 1-4 were significantly reduced, the heat deformation temperature of Comparative Examples 1-3 was significantly reduced, and the flame retardancy rating was significantly deteriorated. This demonstrates that the raw material ratio and preparation method of Example 1 help to simultaneously improve the mechanical properties and temperature resistance of the low-smoke, halogen-free, flame-retardant cable material, and that the cable material has excellent flame retardancy.

[0095] Combining Examples 1-14 with Table 1, it can be seen that the tensile strength of Examples 1-14 is greater than 20 MPa, the elongation at break is greater than 300%, the heat deformation temperature is ≥ 130°C, and the flame retardancy level is V-1 or above. This demonstrates that the raw material ratios and preparation methods of Examples 1-14 can simultaneously improve the mechanical properties, temperature resistance, and flame retardancy of low-smoke, halogen-free flame-retardant cable materials.

[0096] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A low-smoke halogen-free flame-retardant cable material, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of polyolefin blended resin, 10-20 parts of polyphenylene ether, 3-8 parts of glycidyl methacrylate grafted POE, 1-3 parts of hyperbranched polyester amide, 50-80 parts of flame retardant, 5-15 parts of silicone powder, 0.5-1.5 parts of antioxidant and 0.05-0.2 parts of organic zirconium compound.

2. The low-smoke halogen-free flame-retardant cable material according to claim 1, characterized in that: Based on the total weight of the polyolefin blended resin, the polyolefin blended resin includes 40-60 parts of HDPE, 30-40 parts of EVA, 5-10 parts of SEBS-g-MAH, 1-3 parts of nanocellulose, and 10-15 parts of synthetic mica powder.

3. The low-smoke halogen-free flame-retardant cable material according to claim 2, characterized in that: The low-smoke halogen-free flame-retardant cable material also includes multifunctional epoxy resin.

4. The low-smoke halogen-free flame-retardant cable material according to claim 3, characterized in that: The low-smoke halogen-free flame-retardant cable material also includes polyethylene wax.

5. The low-smoke halogen-free flame-retardant cable material according to claim 1, characterized in that: The flame retardant comprises magnesium hydroxide, aluminum hydroxide and phosphorus nitrogen expansion type flame retardant in a weight ratio of (14-18): (7-9):

1.

6. The low-smoke halogen-free flame-retardant cable material according to claim 1, characterized in that: The antioxidant includes at least one of the antioxidant 1010 and the antioxidant 168 .

7. A method for preparing a low-smoke halogen-free flame-retardant cable material according to any one of claims 1 to 6, characterized in that: The steps include: The polyolefin blend resin, polyphenylene ether, glycidyl methacrylate grafted POE, hyperbranched polyester amide, silicone powder, flame retardant, antioxidant and organic zirconium compound are uniformly mixed to obtain a mixture; The mixture is added to a twin-screw extruder, and the temperature of each section of the twin-screw extruder is as follows: feeding section 160-170°C, compression section 180-190°C, melting section 190-210°C, and die head 200-210°C; after the mixture is melted and extruded through the twin-screw extruder, it is cooled, pelletized, and dried to obtain a low-smoke, halogen-free, flame-retardant cable material.

8. The method for preparing the low-smoke halogen-free flame-retardant cable material according to claim 7, characterized in that: The preparation method of the polyolefin blend resin comprises the following steps: HDPE, EVA, and SEBS-g-MAH are dried to a moisture content of ≤0.1% and then mixed, and nanocellulose and synthetic mica powder are added and mixed evenly to obtain a premix; The premix is ​​added to a twin-screw extruder, and the temperature of each section of the twin-screw extruder is as follows: feeding section 160-170°C, compression section 180-190°C, melting section 195-205°C, and die head 190-200°C; the premix is ​​melt-extruded through the twin-screw extruder, cooled, pelletized, and dried to obtain a polyolefin blended resin.

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