Cable material and preparation method thereof

Abstract

The invention provides a cable material and a preparation method thereof. The cable material is prepared from a modified hydrogenated styrene-butadiene block copolymer, a hydrogenated styrene-butadiene block copolymer, polyphenyl ether, polystyrene, an ethylene-alpha-octene copolymerized thermoplastic elastomer, a flame retardant, paraffin oil, a polyamine compound, an assistant crosslinker and an antioxidant. The cable material prepared by the invention has high flame retardancy, and can achieve a 125 DEG C American standard electronic wire temperature resistance effect.

Description

Technical Field

[0001] The present invention relates to the field of functional polymer materials, and more particularly to a cable material and a preparation method thereof. Background Art

[0002] Polyphenylene ether (PPO) is a thermoplastic engineering plastic with excellent mechanical properties, heat resistance, electrical insulation, dimensional stability and other advantages. It is widely used in automobiles, photovoltaics, chemicals, water treatment, electronic appliances, medical devices and other fields. However, due to the defects of polyphenylene ether such as high melt viscosity, poor fluidity, low notched impact strength, and difficulty in processing and molding, its industrial application is subject to certain restrictions. The modified polyphenylene ether product prepared by elastomer blending modification has low density, high mechanical strength, and good flame retardant properties. It can be used in wires and cables, automobiles, shoe materials, daily rubber packaging and other fields.

[0003] At present, the flame-retardant American standard electronic wires at 125℃ need to reach the single vertical combustion VW-1, the mechanical strength needs to reach 13.79MPa, the elongation at break needs to reach 300%, and the aging retention rate at 158℃ for 7 days needs to reach more than 80%. Generally, the low-halogen irradiated cross-linked polyolefin materials commonly used in the market to prepare American standard electronic wires do not meet the requirements of halogen-free environmental protection.

[0004] Patent CN115806720A discloses a flame-retardant TPE cable material and its preparation method, which adopts a halogen-free and phosphorus-free flame-retardant system, meets the halogen-free environmental protection requirements, and can reach a temperature resistance level of 125°C without irradiation, but a large amount of flame retardant needs to be filled in the material, resulting in the material's elongation at break being difficult to reach 300%, and cannot meet the relevant standards of US UL1581. Halogen-free flame-retardant polyolefin cable material systems require a large amount of flame retardant to achieve vertical combustion flame retardancy. A large amount of halogen-free flame retardant filling will reduce the mechanical properties, temperature resistance, and scratch resistance of the material, and the flame retardant stability is poor, which cannot meet the relevant standards of US UL1581. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a cable material and a preparation method thereof.

[0006] The invention uses polyphenylene ether (PPO) and hydrogenated styrene-butadiene block copolymer (SEBS) with high styrene content as a matrix, uses phosphorus-based and silicon-based flame retardants as a halogen-free flame retardant system, uses polystyrene and maleic anhydride grafted materials as phase interface modifiers, and preferably uses an aging antioxidant system and introduces dynamic micro-crosslinking, thereby obtaining a radiation-crosslinked modified polyphenylene ether cable material for 125°C American standard electronic wires.

[0007] The present invention introduces a phosphorus-silicon synergistic flame retardant system, which replaces the phosphorus-nitrogen flame retardant system commonly used in the prior art, and can achieve a good flame retardant effect without a large amount of filling; at the same time, polyamine and maleic anhydride grafted materials are introduced into the material to achieve dynamic micro-crosslinking and synergistic radiation crosslinking, thereby ensuring the excellent heat resistance of the material and overcoming the problem of difficulty in radiation crosslinking of polyphenylene ether system cable materials.

[0008] The invention solves the problem of flame retardant dispersion by introducing maleic anhydride modified hydrogenated styrene-butadiene block copolymer; by optimizing the types and proportions of polymers and antioxidants, polyphenylene ether and hydrogenated styrene-butadiene block copolymer with high styrene content are used as a matrix, and the dispersion degree of polyphenylene ether in hydrogenated styrene-butadiene block copolymer is improved.

[0009] Specifically, one of the objects of the present invention is to provide a cable material, which is prepared from raw materials including the following components, each component being calculated by weight:

[0010]

[0011] Preferably, the components are calculated by weight:

[0012]

[0013]

[0014] Furthermore, the raw material components for preparing the cable material also include a lubricant, and the amount of the lubricant added is 2 to 5 parts by weight, preferably 3 to 4 parts by weight.

[0015] Furthermore, the lubricant may be one or a combination of high molecular weight silicone, stearic acid, zinc stearate, polyethylene wax, and erucamide.

[0016] Further, in the present invention, the content of styrene in the hydrogenated styrene-butadiene block copolymer is 30-50%; preferably, the hydrogenated styrene-butadiene block copolymer is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer. The hydrogenated styrene-butadiene block copolymer has excellent mechanical properties and processing properties, and the polystyrene hard segment phase structure is similar to that of polyphenylene ether. The more the polystyrene hard segment content, the better the compatibility of the hydrogenated styrene-butadiene block copolymer with polyphenylene ether.

[0017] Furthermore, the modified hydrogenated styrene-butadiene block copolymer is modified by maleic anhydride; preferably, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer is 1.4-2%. Maleic anhydride has strong polarity and can react with functional groups such as hydroxyl groups on the surface of the filler. In the present invention, the grafted maleic anhydride can improve the dispersibility of the flame retardant filler in the composite material system.

[0018] Furthermore, the polyphenylene ether is poly-2,6-dimethyl-1,4-phenylene ether; preferably, the intrinsic viscosity of poly-2,6-dimethyl-1,4-phenylene ether is 0.35-0.5 dl / g. Polyphenylene ether is an engineering plastic, and the glass transition temperature of 2,6-dimethyl-1,4-phenylene ether is as high as 213°C, and it has excellent mechanical properties, heat resistance, flame retardancy and creep bending resistance.

[0019] Furthermore, the melt index of polystyrene is 1 to 10 g / 10 min (200°C, 5 kg); the main chain structure of polystyrene is similar to that of polyphenylene ether, and the hard segment structure of hydrogenated styrene-butadiene block copolymer is consistent. The introduction of polystyrene can be used as a compatibilizer between hydrogenated styrene-butadiene block copolymer and polyphenylene ether, and is used to improve the dispersibility of polyphenylene ether in hydrogenated styrene-butadiene block copolymer; at the same time, the glass transition temperature of polystyrene is 104°C, which has excellent processing characteristics and can greatly reduce the overall processing temperature of the composite material.

[0020] Furthermore, the melt index of the ethylene-α-octene copolymer thermoplastic elastomer is 1 to 5 g / 10 min (190° C., 2.16 kg); the main chain of the ethylene-α-octene copolymer thermoplastic elastomer is saturated, and it is resistant to environmental aging and UV rays; at the same time, the molecular chain of the ethylene-α-octene copolymer thermoplastic elastomer is partially crystallized and has high flexibility. Introducing the ethylene-α-octene copolymer thermoplastic elastomer into the composite material system can improve processing and toughening effects.

[0021] Furthermore, the polyamine compound is one or a combination of ethylenediamine, diethyltriamine, triethyltetramine, and tetraethylpentamine; the polyamine and maleic anhydride can chemically react under processing conditions to form a partial micro-crosslinking structure, thereby improving the thermal stability of the composite material.

[0022] Furthermore, the auxiliary cross-linking agent is one or a combination of triallyl isocyanurate and trimethylolpropane trimethacrylate.

[0023] Furthermore, the flame retardant is a mixture of a phosphorus-based flame retardant and a silicon-based flame retardant, wherein the weight ratio of the phosphorus-based flame retardant to the silicon-based flame retardant is (10-30):1, preferably (10-20):1.

[0024] Furthermore, the phosphorus-based flame retardant is one or a combination of diethyl aluminum hypophosphite and melamine polyphosphate; the phosphorus-based flame retardant can be used as an acid source to promote the dehydration of the polymer matrix into carbon during combustion, and can also form a liquid film on the surface of the condensed phase to play a role in heat insulation and oxygen isolation, thereby achieving a flame retardant effect.

[0025] Furthermore, the silicon-based flame retardant is one or a combination of silicon dioxide, wollastonite, silica powder, montmorillonite, and sepiolite; during the combustion process, the silicon-based flame retardant can significantly promote the formation of a combustion carbon layer, increase the thickness and integrity of the carbon layer, and better improve the flame retardant performance.

[0026] Furthermore, the antioxidant includes a primary antioxidant and a secondary antioxidant, wherein the weight ratio of the primary antioxidant to the secondary antioxidant is (0.8-8):1, preferably (1.5-3):1.

[0027] Furthermore, the primary antioxidant is a hindered phenol antioxidant, preferably antioxidant 1010; the secondary antioxidant is one or a combination of dilauryl thiodipropionate, distearyl thiodipropionate, pentaerythritol tetrakis (3-lauryl thiopropionate), and bis (2,4-di-tert-butylphenol) pentaerythritol diphosphite. The present invention can improve the aging resistance of the composite material by using the primary antioxidant and the secondary antioxidant in combination.

[0028] Furthermore, the cable material of the present invention is prepared by the following method, and the specific steps are as follows:

[0029] Modified hydrogenated styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, polyphenylene ether, polystyrene, ethylene-α-octene copolymer thermoplastic elastomer, paraffin oil, flame retardant, polyamine compound, co-crosslinking agent and antioxidant are mixed in a high-speed mixer for 5 to 10 minutes at a mixing temperature of 50 to 60° C. to obtain a uniformly dispersed mixture.

[0030] The mixed powder is mixed and kneaded by a twin-screw extruder, the temperature of the twin-screw heating section is 180-230°C, the screw speed is 150-300r / min, and after the twin-screw shearing and kneading, it is water-cooled and pelletized to obtain the cable material.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention introduces a phosphorus-silicon synergistic flame retardant system, reduces the filling amount of the flame retardant, improves the carbonization stability during the combustion process, and further improves the flame retardant stability; at the same time, the phosphorus-silicon synergistic flame retardant system has the advantages of being halogen-free and green and environmentally friendly.

[0033] 2. The present invention enables polyamine and maleic anhydride to undergo chemical reaction under processing conditions to form a partial dynamic micro-crosslinking structure, thereby improving the thermal stability of the composite material; the dynamic micro-crosslinking is combined with subsequent wire radiation crosslinking to overcome the problem of greater difficulty in crosslinking cable materials of the polyphenylene ether system, thereby ensuring that the wire can meet the relevant standards of the American standard UL1581.

[0034] 3. The present invention uses hydrogenated styrene-butadiene block copolymer modified by maleic anhydride as a matrix and introduces polystyrene as a compatibilizer to improve the dispersion of polyphenylene ether in the hydrogenated styrene-butadiene block copolymer matrix; through the coordinated use of the primary antioxidant and the secondary antioxidant, the aging resistance of the composite material can be improved. DETAILED DESCRIPTION

[0035] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the content of the present invention still fall within the scope of protection of the present invention.

[0036] In the examples and comparative examples of the present invention, the raw materials used are all commercially available products.

[0037] Example 1

[0038] This example is used to illustrate the preparation of cable materials, wherein the raw materials and mass fractions of the components used to prepare the cable materials are as follows, see Table 1 for details:

[0039]

[0040] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 1.4%, the styrene content in the hydrogenated styrene-butadiene block copolymer is 30%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.4dl / g, the melt index of polystyrene is 3g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 3g / 10min.

[0041] The specific preparation steps are as follows:

[0042] Weigh each component according to the above weight portion, mix in a high-speed mixer for 5 minutes, the mixing temperature is 50°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 200r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0043] The cable sheet preparation process is as follows:

[0044] The above cable material is thinned, packaged, plasticized and sheeted on an open mixing mill (roller temperature of the mixing mill is 160°C), hot pressed (190°C, 10MPa, 10min) by a flat vulcanizer, and then cold pressed (40°C, 5min) to obtain a 100mm*100mm*1mm cable material sheet.

[0045] The cable material and wire preparation process is as follows:

[0046] The cable material was taken and extruded by a single screw (45 machine) extruder at extrusion temperatures of 180°C, 200°C, 215°C, 215°C, and 220°C to obtain cable wires, which were then irradiated and cross-linked by irradiation equipment to obtain irradiated wires. The wire specifications were UL 3266AWG18#, and the irradiation dose was 14Mrad.

[0047] Example 2

[0048] This example is used to illustrate the preparation of cable materials, wherein the raw materials and mass fractions of the components used to prepare the cable materials are as follows, see Table 1 for details:

[0049]

[0050]

[0051] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 2%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 33%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.45 dl / g, the melt index of polystyrene is 5 g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 3 g / 10min.

[0052] The specific preparation steps are as follows:

[0053] Weigh each component according to the above weight portion, mix in a high-speed mixer for 8 minutes, the mixing temperature is 50°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 250r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0054] The preparation process of the cable material sheets and wires in this embodiment is the same as that in Embodiment 1.

[0055] Example 3

[0056] This example is used to illustrate the preparation of cable materials, wherein the raw materials and mass fractions of the components used to prepare the cable materials are as follows, see Table 1 for details:

[0057]

[0058]

[0059] Among them, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 2%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 50%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 1 g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 1 g / 10min.

[0060] The specific preparation steps are as follows:

[0061] Weigh each component according to the above weight portion, mix in a high-speed mixer for 10 minutes, the mixing temperature is 60°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 280r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0062] The preparation process of the cable material sheets and wires in this embodiment is the same as that in Embodiment 1.

[0063] Example 4

[0064] This example is used to illustrate the preparation of cable materials, wherein the raw materials and mass fractions of the components used to prepare the cable materials are as follows, see Table 1 for details:

[0065]

[0066]

[0067] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 2%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 50%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.4dl / g, the melt index of polystyrene is 8g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 5g / 10min.

[0068] The specific preparation steps are as follows:

[0069] Weigh each component according to the above weight portion, mix in a high-speed mixer for 10 minutes, the mixing temperature is 60°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 300r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0070] The preparation process of the cable material sheets and wires in this embodiment is the same as that in Embodiment 1.

[0071] Comparative Example 1

[0072] This comparative example is used to illustrate the preparation of cable materials. In this comparative example, no polyamine compound is added. The raw materials and mass fractions of the components for preparing the cable materials are as follows, see Table 1 for details:

[0073]

[0074]

[0075] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 1.4%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 33%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.35 dl / g, the melt index of polystyrene is 10 g / 10 min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 3 g / 10 min.

[0076] The specific preparation steps are as follows:

[0077] Weigh each component according to the above weight portion, mix in a high-speed mixer for 8 minutes, the mixing temperature is 50°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 250r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0078] The preparation process of the cable material sheets and wires in this comparative example is the same as that in Example 1.

[0079] Comparative Example 2

[0080] This comparative example is used to illustrate the preparation of cable materials. In this comparative example, no silicon-based flame retardant is added. The raw materials and mass fractions of the components used to prepare the cable materials are as follows, see Table 1 for details:

[0081]

[0082]

[0083] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 1.4%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 33%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.45 dl / g, the melt index of polystyrene is 5 g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 3 g / 10min.

[0084] The specific preparation steps are as follows:

[0085] Weigh each component according to the above weight portion, mix in a high-speed mixer for 8 minutes, the mixing temperature is 50°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 280r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0086] The preparation process of the cable material sheets and wires in this comparative example is the same as that in Example 1.

[0087] Comparative Example 3

[0088] This comparative example is used to illustrate the preparation of cable material. In this comparative example, no polystyrene is added. The raw materials and mass fractions of the components used to prepare the cable material are as follows, see Table 1 for details:

[0089]

[0090]

[0091] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 1.4%, the styrene content in the hydrogenated styrene-butadiene block copolymer (SEBS) is 45%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.35 dl / g, and the melt index of the ethylene-α-octene copolymer thermoplastic elastomer is 1 g / 10min.

[0092] The specific preparation steps are as follows:

[0093] Weigh each component according to the above weight portion, mix in a high-speed mixer for 10 minutes, the mixing temperature is 60°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 280r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0094] The preparation process of the cable material sheets and wires in this comparative example is the same as that in Example 1.

[0095] Comparative Example 4

[0096] In this comparative example, the scheme of Example 1 of patent CN115806720 is adopted, wherein the flame retardant system is a phosphorus-silicon flame retardant system, and the raw materials and mass fractions of the components for preparing the cable material are as follows, see Table 1 for details:

[0097]

[0098]

[0099] Among them, the hydrogenated styrene-butadiene block copolymer (SEBS) is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer, the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer (MA-SEBS) is 0.8%, the styrene content in the hydrogenated styrene-butadiene block copolymer is 30%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenylene ether (PPO) is 0.4dl / g, the melt index of polystyrene is 3g / 10min, and the melt index of ethylene-α-octene copolymer thermoplastic elastomer is 3g / 10min.

[0100] The specific preparation steps are as follows:

[0101] Weigh each component according to the above weight portion, mix in a high-speed mixer for 5 minutes, the mixing temperature is 50°C, and a uniformly dispersed mixture is obtained. The mixed powder is mixed and kneaded by a twin-screw extruder, the twin-screw aspect ratio is 48:1, the temperature of each heating section is 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw speed is 200r / min, and after twin-screw shearing and kneading, it is water-cooled and pelletized to obtain a cable material.

[0102] The preparation process of the cable material sheets and wires in this comparative example is the same as that in Example 1.

[0103] Table 1 shows the components of the cable materials prepared in Examples 1 to 4 and Comparative Examples 1 to 4 and the added mass fractions.

[0104] Table 1:

[0105]

[0106] In the present invention, the reference standards for performance testing are specifically as follows:

[0107] Reference standards for American standard electronic wires: UL1581 Reference Standard for Electrical Wires, Cables, and Flexible Cords (translation: UL1581 Reference Standard for Electrical Wires, Cables, and Flexible Cords).

[0108] Reference standard for sheet testing: UL2556 Wire and Cable Test Methods

[0109] Table 2 shows the test data of mechanical properties, flame retardant properties and aging resistance of the cable material sheets and wires prepared in Examples 1 to 4 and Comparative Examples 1 to 4.

[0110] Table 2:

[0111]

[0112] The key performance indicators of 125℃ American Standard UL electronic wire are as follows: through single vertical burning (VW-1), the wire mechanical strength must reach 13.79MPa, the elongation at break must reach 300%, and the 158℃ 7-day aging retention rate must reach more than 80%.

[0113] It can be seen from Table 2 that the tensile strength of the wires of Examples 1 to 4 is greater than 13.79 MPa, the elongation is greater than 300%, and they can all pass the single vertical burning test. After the wires are aged at 158°C for 7 days, the elongation retention rate is greater than 80%, which meets the requirements of American standard electronic wires.

[0114] Compared with Example 1, Comparative Example 1 does not add polyamine compounds, and the aging retention rate of the wire material in Comparative Example 1 does not meet the standard. After the polyamine compounds are introduced into Example 1, the tensile strength and elongation at break of the material are improved to a certain extent, and the aging retention rate of the wire material can reach more than 80%. Since the present invention uses hydrogenated styrene-butadiene block copolymer modified by maleic anhydride as a matrix and introduces a small amount of polyamine compounds into the system, it can react chemically under the processing conditions of the composite material to form a partial dynamic micro-crosslinking structure, which is helpful to improve the thermal stability of the composite material and improve the aging retention rate.

[0115] Compared with Example 2, no silicon-based flame retardant is added to Comparative Example 2, and the wire of Comparative Example 2 cannot pass the single vertical combustion (VW-1) test. After the silicon-based flame retardant is introduced into Example 2, the wire can pass the VW-1 test, and the flame retardancy of the material is significantly improved. This is because the addition of the silicon-based flame retardant significantly increases the thickness of the burning carbon layer, forming a porous carbon layer structure. The porous carbon layer can better isolate oxygen and heat during the combustion process, thereby achieving a flame retardant effect.

[0116] Compared with Example 3, Comparative Example 3 did not add polystyrene as a compatibilizer, and the mechanical properties of the sheet and wire of Comparative Example 3 were worse than those of Example 3, and the appearance of the wire of Comparative Example 3 was relatively rough, while the appearance of the wire of Example 3 was smooth. This is because polyphenylene ether and hydrogenated styrene-butadiene block copolymers are difficult to process, and without adding a compatibilizer, polyphenylene ether and hydrogenated styrene-butadiene block copolymers are difficult to disperse well. After adding polystyrene, the dispersion of polyphenylene ether and hydrogenated styrene-butadiene block copolymers is better.

[0117] Compared with Example 1, Comparative Example 4 adopts the polymer formula system of patent CN115806720 and adds the flame retardant system of the present application. The sheet and wire performance of Comparative Example 4 are better, and the tensile strength and elongation at break of the wire before aging are higher, but the aging retention rate is low and cannot meet the US standard.

Claims

1. A cable material, characterized in that: The cable material is prepared from raw materials including the following components, and each component is calculated by weight:

2. The cable material according to claim 1, characterized in that: The components are calculated by weight:

3. The cable material according to claim 1, characterized in that: The raw material components of the cable material also include a lubricant; Based on 100 parts by weight of the modified hydrogenated styrene-butadiene block copolymer, the amount of the lubricant is 2 to 5 parts by weight, preferably 3 to 4 parts by weight; and / or, The lubricant is one or a combination of high molecular weight silicone, stearic acid, zinc stearate, polyethylene wax, and erucamide.

4. The cable material according to claim 1, characterized in that: The content of styrene in the hydrogenated styrene-butadiene block copolymer is 30-50%; and / or, The hydrogenated styrene-butadiene block copolymer is a hydrogenated polystyrene-polybutadiene-polystyrene block copolymer; and / or, The modified hydrogenated styrene-butadiene block copolymer is obtained by modification with maleic anhydride, and the grafting rate of maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer is 1.4-2%.

5. The cable material according to claim 1, characterized in that: The polyphenylene ether is poly-2,6-dimethyl-1,4-phenylene ether, and the intrinsic viscosity of the poly-2,6-dimethyl-1,4-phenylene ether is 0.35 to 0.5 dl / g; and / or, The melt index of the ethylene-α-octene copolymer thermoplastic elastomer is 1 to 5 g / 10 min; and / or, The polyamine compound is one or a combination of ethylenediamine, diethyltriamine, triethyltetramine, and tetraethylpentamine; and / or, The polystyrene has a melt index of 1 to 10 g / 10 min; and / or, The auxiliary cross-linking agent is one or a combination of triallyl isocyanurate and trimethylolpropane trimethacrylate.

6. The cable material according to claim 1, characterized in that: The flame retardant is a mixture of a phosphorus-based flame retardant and a silicon-based flame retardant; and / or, The weight ratio of the phosphorus-based flame retardant to the silicon-based flame retardant is (10-30):1, preferably (10-20):1; and / or, The phosphorus-based flame retardant is one or a combination of diethyl aluminum hypophosphite and melamine polyphosphate; and / or, The silicon-based flame retardant is one or a combination of silicon dioxide, wollastonite, silica powder, montmorillonite and sepiolite.

7. The cable material according to claim 1, characterized in that: The antioxidant includes a primary antioxidant and a secondary antioxidant; and / or, The weight ratio of the primary antioxidant to the secondary antioxidant is (0.8-8):1; preferably (1.5-3):

1.

8. The cable material according to claim 7, characterized in that: The primary antioxidant is a hindered phenol antioxidant; and / or, The auxiliary antioxidant is one or a combination of dilauryl thiodipropionate, distearyl thiodipropionate, pentaerythritol tetrakis (3-lauryl thiopropionate), and bis (2,4-di-tert-butylphenol) pentaerythritol diphosphite.

9. The method for preparing a cable material according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: The raw materials including modified hydrogenated styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, polyphenylene ether, polystyrene, ethylene-α-octene copolymer thermoplastic elastomer, paraffin oil, flame retardant, polyamine compound, co-crosslinking agent and antioxidant are uniformly mixed, kneaded by a twin-screw extruder, water-cooled and pelletized to obtain the cable material.

10. The method for preparing a cable material according to claim 9, characterized in that: The mixing temperature is 50-60°C; and / or, The mixing temperature of the twin-screw extruder is 180-230°C, and the screw speed is 150-300r / min.

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