A cable material and a method for producing the same

Abstract

The application provides a cable material and a preparation method thereof, and the cable material is prepared from modified hydrogenated styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, polyphenyl ether, polystyrene, ethylene-alpha-octene copolymer thermoplastic elastomer, flame retardant, paraffin oil, polyamine compound, crosslinking aid, and antioxidant. The cable material prepared by the application has high flame retardance and can reach the temperature resistance effect of 125 DEG C American standard electronic wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of functional polymer materials, and further relates to a cable material and a preparation method thereof. BACKGROUND

[0002] Polyphenylene ether (PPO) is a thermoplastic engineering plastic, which has excellent mechanical properties, heat resistance, electrical insulation resistance, dimensional stability and other advantages, and is widely used in the fields of automobiles, photovoltaics, chemical industry, water treatment, electronics, medical devices and the like. However, the industrialization application of polyphenylene ether is limited to a certain extent due to its defects such as high melt viscosity, poor flowability, low notched impact strength, and difficult processing and molding. The modified polyphenylene ether product prepared by elastomer blending modification has low density, high mechanical strength and good flame retardance, and can be applied in the fields of electric wires and cables, automobiles, shoe materials, daily rubber-coated materials and the like.

[0003] At present, the 125℃ flame-retardant American standard electronic wire needs to achieve single vertical burning VW-1, the mechanical strength needs to reach 13.79 MPa, the elongation at break needs to reach 300%, and the 158℃ 7-day aging retention rate needs to reach more than 80%. Generally, the low-halogen irradiation cross-linked polyolefin material commonly used in the market to prepare American standard electronic wire does not meet the halogen-free environmental protection requirements.

[0004] Patent CN115806720A discloses a flame-retardant TPE cable material and a preparation method thereof, which adopts a halogen-free and phosphorus-free flame-retardant system, meets the halogen-free environmental protection requirements, and can achieve 125℃ temperature resistance grade without irradiation. However, a large amount of flame retardant needs to be filled in the material, which makes it difficult for the material to reach an elongation at break of 300%, and the material cannot meet the relevant standards of American UL1581. A large amount of halogen-free flame retardant needs to be filled in the polyolefin cable material system to achieve vertical burning flame retardation. The large amount of halogen-free flame retardant 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 American UL1581. SUMMARY

[0005] To solve the above problems, the present application provides a cable material and a preparation method thereof.

[0006] The present application uses polyphenylene ether (PPO) and high-styrene-content hydrogenated styrene-butadiene block copolymer (SEBS) as the matrix, uses phosphorus-based and silicon-based flame retardants as the halogen-free flame retardant system, uses polystyrene and maleic anhydride grafting material as the phase interface modifier, and optimally selects the aging antioxidant system to introduce dynamic micro-crosslinking, thereby obtaining an irradiation cross-linked modified polyphenylene ether cable material for 125℃ American standard electronic wire.

[0007] The present application introduces a phosphorus-silicon synergistic flame-retardant system, replaces the conventional phosphorus-nitrogen flame-retardant system in the prior art, and achieves a good flame-retardant effect without a large amount of filling; meanwhile, the material is introduced with a polyamine and a maleic anhydride grafted material to realize dynamic micro-crosslinking and synergistic irradiation crosslinking, ensure excellent heat resistance of the material, and overcome the problem of difficulty in irradiation crosslinking of the polyphenylene ether system cable material.

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

[0009] Specifically, one of the purposes of the present application is to provide a cable material prepared from raw materials including the following components, each in parts by weight:

[0010]

[0011] Preferably, each component is in parts by weight as follows:

[0012]

[0013]

[0014] Further, the raw material components for preparing the cable material further include a lubricant, and the lubricant is added in an amount of 2-5 parts by weight, preferably 3-4 parts by weight.

[0015] Still further, the lubricant can be one or a combination of high-molecular-weight silicone, stearic acid, zinc stearate, polyethylene wax and erucic amide.

[0016] Further, in the present application, 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, and the more the content of the polystyrene hard segment, the better the compatibility of the hydrogenated styrene-butadiene block copolymer with polyphenylene ether.

[0017] Further, the modified hydrogenated styrene-butadiene block copolymer is obtained by modification of 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 application, the grafted maleic anhydride can improve the dispersibility of the flame-retardant filler in the composite system.

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

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

[0020] Further, the melt index of the ethylene-α-octene copolymer thermoplastic elastomer is 1-5 g / 10 min (190℃, 2.16 Kg); the main chain of the ethylene-α-octene copolymer thermoplastic elastomer is saturated, having environmental aging resistance and ultraviolet resistance; at the same time, the ethylene-α-octene copolymer thermoplastic elastomer molecular chain exists partial crystallization, having high flexibility, and the introduction of the ethylene-α-octene copolymer thermoplastic elastomer in the composite material system can improve the processing and toughening effect.

[0021] Further, 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, improving the thermal stability of the composite material.

[0022] Further, the co-crosslinking agent is one or a combination of triallyl isocyanurate and trimethylolpropane trimethacrylate.

[0023] Further, the flame retardant is a mixture of phosphorus-based flame retardant and 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] Further, the phosphorus-based flame retardant is one or a combination of aluminum diethyl phosphite and melamine polyphosphate; the phosphorus-based flame retardant can promote the dehydration of the polymer matrix into carbon during combustion as an acid source, and can also form a liquid film on the surface of the condensed phase, playing a heat insulation and oxygen insulation role to achieve the effect of flame retardation.

[0025] Further, the silicon flame retardant is one or a combination of silicon dioxide, wollastonite, silicon powder, montmorillonite and meerschaum; the silicon flame retardant can obviously promote the formation of the carbon layer during the combustion process, increase the thickness and integrity of the carbon layer, and better improve the flame retardant performance.

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

[0027] Further, the primary antioxidant is a hindered phenol antioxidant, and preferably antioxidant 1010; and the secondary antioxidant is one or a combination of dilauryl thiodipropionate, dioctadecyl thiodipropionate, pentaerythritol tetrakis(3-laurylthiopropionate), and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

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

[0029] The modified hydrogenated styrene-butadiene block copolymer, hydrogenated styrene-butadiene block copolymer, polyphenyl ether, polystyrene, ethylene-alpha-octene copolymer thermoplastic elastomer, paraffin oil, flame retardant, polyamine compound, crosslinking aid, antioxidant are mixed in a high-speed mixer for 5-10 min at a mixing temperature of 50-60 DEG C to obtain a uniformly dispersed mixture.

[0030] The mixed powder is mixed and kneaded by a double-screw extruder, the temperature of the heating section of the double screw is 180-230 DEG C, the screw rotation speed is 150-300 r / min, and the cable material is obtained after shearing and kneading by the double screw, water cooling and pelletizing.

[0031] Compared with the prior art, the present application has the following advantages:

[0032] 1. The present application introduces a phosphorus-silicon synergistic flame retardant system, reduces the filling fraction of the flame retardant, improves the carbon 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 halogen-free and green environmental protection.

[0033] 2. The present application can form a part of dynamic micro-crosslinking structure by the chemical reaction of the polyamine and maleic anhydride under the processing conditions, improve the thermal stability of the composite material; the dynamic micro-crosslinking cooperates with the subsequent wire irradiation crosslinking, overcomes the problem that the crosslinking of the cable material of the polyphenyl ether system is difficult, and ensures that the wire can meet the relevant standards of the American standard UL1581.

[0034] 3、The maleic anhydride modified hydrogenated styrene-butadiene block copolymer is used as the matrix, and polystyrene is introduced as the compatilizer, so that the dispersion of the polyphenyl ether in the hydrogenated styrene-butadiene block copolymer matrix is improved; and the cooperation of the primary antioxidant and the secondary antioxidant can improve the aging resistance of the composite material. DETAILED DESCRIPTION

[0035] It is necessary to point out here that the following examples are only used for further illustration of the present application, and cannot be understood as limiting the protection scope of the present application, and some non-essential improvements and adjustments of the present application by the person skilled in the art according to the content of the present application still belong to the protection scope of the present application.

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

[0037] Example 1

[0038] This example is used to illustrate the preparation of the cable material, wherein the raw materials and the mass parts of the components for preparing the cable material are as follows, and details are shown in Table 1:

[0039]

[0040] The hydrogenated styrene-butadiene block copolymer (SEBS) is 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 content of styrene in the hydrogenated styrene-butadiene block copolymer is 30%, the intrinsic viscosity of poly2,6-dimethyl-1,4-phenyl ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 3 g / 10 min, and the melt index of ethylene-alpha-octene copolymer thermoplastic elastomer is 3 g / 10 min.

[0041] The specific preparation steps are as follows:

[0042] The components are weighed according to the above weight parts, mixed in a high-speed mixer for 5 min, and the mixing temperature is 50℃, to obtain a uniformly dispersed mixture. The mixed powder is mixed and kneaded through a double-screw extruder, the length-diameter ratio of the double screw is 48:1, the temperature of each heating section is 190℃, 200℃, 205℃, 210℃, 210℃, 215℃, 215℃, 220℃, 220℃, 225℃, 210℃, the screw rotation speed is 200 r / min, and after shearing and mixing through the double screw, the cable material is obtained through water cooling and granulation.

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

[0044] The cable material was taken and passed through a mill (mill roller temperature 160°C), packed, plasticized, and sheeted. The sheet was hot-pressed (190°C, 10 MPa, 10 min) and then cold-pressed (40°C, 5 min) to obtain a 100 mm*100 mm*1 mm cable material sheet.

[0045] The cable material wire was prepared as follows:

[0046] The cable material was taken and passed through a single screw (45 machine) wire extruder at an extrusion temperature of 180°C, 200°C, 215°C, 215°C, 220°C to obtain a cable material wire, which was then irradiated and crosslinked by an irradiation device to obtain an irradiated wire. The wire specification was UL 3266 AWG18#, and the irradiation dose was 14 Mrad.

[0047] Example 2

[0048] This example is used to illustrate the preparation of a cable material, in which the raw materials and mass fractions of the components for preparing the cable material are as follows, as shown in Table 1:

[0049]

[0050]

[0051] 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 the poly(2,6-dimethyl-1,4-phenylene ether) (PPO) is 0.45 dl / g, the melt index of the polystyrene is 5 g / 10 min, and the melt index of the ethylene-alpha-octene copolymer thermoplastic elastomer is 3 g / 10 min.

[0052] The specific preparation steps are as follows:

[0053] The components were weighed according to the above weight parts, mixed in a high-speed mixer for 8 min, and the mixing temperature was 50°C to obtain a uniformly dispersed mixture. The mixed powder was mixed and kneaded by a twin-screw extruder with a length-diameter ratio of 48:1, and the temperature of each heating section was 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, and 210°C. The screw rotation speed was 250 r / min. After shearing and mixing by the twin-screw extruder, the material was water-cooled and pelletized to obtain a cable material.

[0054] The cable material sheet and wire of this example were prepared by the same process as in Example 1.

[0055] Example 3

[0056] This example is used to illustrate the preparation of cable material, wherein the raw materials and mass fractions of each component for preparing the cable material are as follows, and details are shown in Table 1:

[0057]

[0058]

[0059] 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-phenyl ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 1 g / 10 min, and the melt index of ethylene-alpha-octene copolymer thermoplastic elastomer is 1 g / 10 min.

[0060] The specific preparation steps are as follows:

[0061] According to the above weight parts, each component is mixed in a high-speed mixer for 10 min, and the mixing temperature is 60°C, to obtain a uniformly dispersed mixture. The mixed powder is mixed and kneaded by a twin-screw extruder, the length-diameter ratio of the twin screw 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 rotation speed is 280 r / min, and after shearing and mixing by the twin screw, water cooling and granulation are performed, to obtain the cable material.

[0062] The cable material sheet and wire material preparation process of this example is the same as that of Example 1.

[0063] Example 4

[0064] This example is used to illustrate the preparation of cable material, wherein the raw materials and mass fractions of each component for preparing the cable material are as follows, and details are shown in Table 1:

[0065]

[0066]

[0067] 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 content of styrene in the hydrogenated styrene-butadiene block copolymer (SEBS) is 50%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenyl ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 8 g / 10 min, and the melt index of the ethylene-alpha-octene copolymer thermoplastic elastomer is 5 g / 10 min.

[0068] The specific preparation steps are as follows:

[0069] The components are weighed according to the above weight parts, mixed in a high-speed mixer for 10 min, and the mixing temperature is 60°C, to obtain a uniformly dispersed mixture. The mixed powder is mixed and kneaded through a double-screw extruder, the length-diameter ratio of the double screw 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, and the screw rotation speed is 300 r / min. After shearing and mixing through the double screw, water cooling and pelletizing are performed to obtain the cable material.

[0070] The cable material sheet and wire material preparation process of the example are the same as those of example 1.

[0071] Comparative Example 1

[0072] This comparative example is used to illustrate the preparation of a cable material, wherein in this comparative example, no polyamine compound is added, and the raw materials and mass parts of the components for preparing the cable material are as follows, which are shown in Table 1:

[0073]

[0074]

[0075] 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 content of styrene in the hydrogenated styrene-butadiene block copolymer (SEBS) is 50%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenyl ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 8 g / 10 min, and the melt index of the ethylene-alpha-octene copolymer thermoplastic elastomer is 5 g / 10 min.

[0076] The specific preparation steps are as follows:

[0077] The components were weighed according to the above weight parts, mixed in a high-speed mixer for 8 min, and the mixing temperature was 50°C to obtain a uniformly dispersed mixture. The mixed powder was mixed and kneaded through a twin-screw extruder, the length-diameter ratio of the twin screw was 48:1, the temperature of each heating section was 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw rotation speed was 250 r / min, and after shearing and kneading through the twin screw, water cooling and pelletizing were performed to obtain the cable material.

[0078] The cable material sheet and wire material preparation process of the present comparative example was the same as that of Example 1.

[0079] Comparative Example 2

[0080] The present comparative example was used to illustrate the preparation of a cable material, wherein in the present comparative example, no silicon-based flame retardant was added, and the raw materials and mass parts of the components for preparing the cable material were as follows, as shown in Table 1:

[0081]

[0082]

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

[0084] The specific preparation steps were as follows:

[0085] The components were weighed according to the above weight parts, mixed in a high-speed mixer for 8 min, and the mixing temperature was 50°C to obtain a uniformly dispersed mixture. The mixed powder was mixed and kneaded through a twin-screw extruder, the length-diameter ratio of the twin screw was 48:1, the temperature of each heating section was 190°C, 200°C, 205°C, 210°C, 210°C, 215°C, 215°C, 220°C, 220°C, 225°C, 210°C, the screw rotation speed was 250 r / min, and after shearing and kneading through the twin screw, water cooling and pelletizing were performed to obtain the cable material.

[0086] The cable material sheet and wire material preparation process of the present comparative example was the same as that of Example 1.

[0087] Comparative Example 3

[0088] The present comparative example is used to illustrate the preparation of cable material, wherein in the present comparative example, no polystyrene is added, and the raw materials and mass fractions of the components for preparing the cable material are as follows, which are shown in Table 1 in detail:

[0089]

[0090]

[0091] wherein 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-phenyl ether (PPO) is 0.35 dl / g, and the melt index of ethylene-alpha-octene copolymer thermoplastic elastomer is 1 g / 10 min.

[0092] The specific preparation steps are as follows:

[0093] According to the above weight parts, each component is mixed in a high-speed mixer for 10 min, and the mixing temperature is 60°C, to obtain a uniformly dispersed mixture. The mixed powder is mixed and kneaded through a double screw extruder, the length-diameter ratio of the double screw 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 rotation speed is 280 r / min, and after shearing and mixing through the double screw, water cooling and pelletizing are performed to obtain the cable material.

[0094] The cable material sheet and wire material preparation process of the present comparative example is the same as that of Example 1.

[0095] Comparative Example 4

[0096] In the present comparative example, the scheme of patent CN115806720 Example 1 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, which are shown in Table 1 in detail:

[0097]

[0098]

[0099] 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 content of styrene in the hydrogenated styrene-butadiene block copolymer is 30%, the intrinsic viscosity of poly 2,6-dimethyl-1,4-phenyl ether (PPO) is 0.4 dl / g, the melt index of polystyrene is 3 g / 10 min, and the melt index of ethylene-alpha-octene copolymer thermoplastic elastomer is 3 g / 10 min.

[0100] The specific preparation steps are as follows:

[0101] According to the above weight parts, each component is mixed in a high-speed mixer for 5 min, and the mixing temperature is 50 DEG C, to obtain a uniformly dispersed mixture. The mixed powder is mixed and kneaded by a double screw extruder, the length-diameter ratio of the double screw is 48:1, the temperature of each heating section is 190 DEG C, 200 DEG C, 205 DEG C, 210 DEG C, 210 DEG C, 215 DEG C, 215 DEG C, 220 DEG C, 220 DEG C, 225 DEG C, 210 DEG C, the screw rotation speed is 200 r / min, and after shearing and mixing by the double screw, water cooling and pelletizing are carried out, to obtain the cable material.

[0102] The cable material sheet and wire material preparation process of the comparative example is the same as that of example 1.

[0103] Table 1 is the mass fraction of each component and addition of the cable material prepared in examples 1-4 and comparative examples 1-4.

[0104] Table 1:

[0105]

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

[0107] The reference standard of American standard electronic wire is UL1581 Reference Standard for Electrical Wires, Cables, and Flexible Cords.

[0108] The reference standard of sheet testing is UL2556 Wire and Cable Test Methods.

[0109] Table 2 is the mechanical property, flame retardant property and aging resistance test data of the cable material sheet and wire material prepared in examples 1-4 and comparative examples 1-4.

[0110] Table 2:

[0111]

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

[0113] As can be seen from Table 2, the tensile strength of the wire of Examples 1-4 is greater than 13.79 MPa, the elongation is greater than 300%, and the wire can pass the single vertical combustion test, and the elongation retention rate of the wire after aging at 158℃ for 7 days is greater than 80%, meeting the requirements of the American standard electronic wire.

[0114] Compared with Example 1, Comparative Example 1 does not add a polyamine compound, and the aging retention rate of the wire of Comparative Example 1 does not meet the standard, while the tensile strength and elongation at break of the material are improved after the introduction of the polyamine compound in Example 1, and the aging retention rate of the wire can reach more than 80%. Since the hydrogenated styrene-butadiene block copolymer modified by maleic anhydride is used as the matrix in the present application, a small amount of polyamine compound is introduced into the system, and chemical reaction can occur under the processing conditions of the composite material to form a part of dynamic micro-crosslinking structure, which helps to improve the thermal stability of the composite material and improve the aging retention rate.

[0115] Compared with Example 2, Comparative Example 2 does not add a silicon-based flame retardant, and the wire of Comparative Example 2 cannot pass the single vertical combustion (VW-1) test, while the wire of Example 2 can pass the VW-1 test after the introduction of the silicon-based flame retardant, and the flame retardance of the material is obviously improved, which is because the thickness of the combustion carbon layer is obviously increased due to the addition of the silicon-based flame retardant, forming a porous carbon layer structure, which can better isolate oxygen and heat during the combustion process and has a flame-retardant effect.

[0116] Compared with Example 3, Comparative Example 3 does not add polystyrene as a compatibilizer, and the mechanical properties of the sheet and the wire of Comparative Example 3 are poorer than those of Example 3, and the appearance of the wire of Comparative Example 3 is rougher, while the appearance of the wire of Example 3 is smooth. This is because the processing difficulty of polyphenyl ether and hydrogenated styrene-butadiene block copolymer is large, and in the absence of a compatibilizer, polyphenyl ether and hydrogenated styrene-butadiene block copolymer are difficult to disperse well, and after the addition of polystyrene, polyphenyl ether and hydrogenated styrene-butadiene block copolymer are better dispersed.

[0117] Compared with Example 1, Comparative Example 4 uses the polymer formulation system of the patent CN115806720 and adds the flame retardant system of the present application, and the performance of the sheet and the wire of Comparative Example 4 is good, 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 American standard.

Claims

1. A cable compound characterized in that, The cable material is prepared from raw materials including the following components, and each component is calculated by weight: 100 parts by weight of modified hydrogenated styrene-butadiene block copolymer; 10-50 parts by weight of hydrogenated styrene-butadiene block copolymer; 50-90 parts by weight of polyphenylene ether; 10-40 parts by weight of polystyrene; 20-60 parts by weight of ethylene-α-octene copolymer thermoplastic elastomer; 90-150 parts by weight of flame retardant; 10-40 parts by weight of paraffin oil; 1-7 parts by weight of a polyamine compound; 0.8-3 parts by weight of auxiliary cross-linking agent; 2-7 parts by weight of antioxidant; The modified hydrogenated styrene-butadiene block copolymer is obtained by modification with maleic anhydride; The flame retardant is a mixture of a phosphorus-based flame retardant and a silicon-based flame retardant.

2. The cable compound of claim 1, wherein, The components are calculated by weight: 100 parts by weight of modified hydrogenated styrene-butadiene block copolymer; 20-40 parts by weight of hydrogenated styrene-butadiene block copolymer; 60-90 parts by weight of polyphenylene ether; 20-30 parts by weight of polystyrene; 30-50 parts by weight of ethylene-α-octene copolymer thermoplastic elastomer; 100-140 parts by weight of flame retardant; 20-30 parts by weight of paraffin oil; 2-4 parts by weight of a polyamine compound; 1.2-2 parts by weight of a cross-linking agent; 3 to 6 parts by weight of antioxidant 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; 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 compound of claim 3, wherein, Based on 100 parts by weight of the modified hydrogenated styrene-butadiene block copolymer, the amount of the lubricant is 3 to 4 parts by weight.

5. 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 grafting rate of the maleic anhydride in the modified hydrogenated styrene-butadiene block copolymer is 1.4-2%.

6. 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 / 10min; and / or, The polyamine compound is one or a combination of ethylenediamine, diethylenetriamine, triethylenetetramine, and tetraethylenepentamine; 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.

7. The cable material according to claim 1, characterized in that: The weight ratio of the phosphorus-based flame retardant to the silicon-based flame retardant is (10-30):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, silicon powder, montmorillonite, and sepiolite.

8. The cable compound of claim 7, wherein, The weight ratio of the phosphorus-based flame retardant to the silicon-based flame retardant is (10-20):

1.

9. The cable material according to claim 1, wherein, The antioxidant comprises 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.

10. The cable compound of claim 9, wherein, The weight ratio of the primary antioxidant to the secondary antioxidant is (1.5-3):

1.

11. The cable material according to claim 9, wherein, The primary antioxidant is a hindered phenolic antioxidant; and / or, The secondary antioxidant is one or a combination of dilauryl thiodipropionate, dioctadecyl thiodipropionate, pentaerythritol tetra (3-laurylthiopropionate), and bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

12. The process for the preparation of a cable compound according to any one of claims 1 to 11, 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-alpha-octene copolymer thermoplastic elastomer, paraffin oil, flame retardant, polyamine compound, co-crosslinking agent, and antioxidant are uniformly mixed, and then the mixture is mixed by a double-screw extruder, water-cooled, and pelletized to obtain the cable material.

13. The preparation method of the cable material according to claim 12, wherein, The mixing temperature is 50-60°C; and / or, The mixing temperature of the double-screw extruder is 180-230°C, and the screw rotation speed is 150-300 r / min.

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