Flame-retardant cable material and preparation method thereof

Abstract

The invention relates to a flame-retardant cable material and a preparation method thereof, and belongs to the technical field of cables. The flame-retardant cable material is prepared from the following raw materials in parts by mass: 60 to 90 parts of thermoplastic polyurethane elastomer, 20 to 25 parts of polyvinyl chloride, 15 to 20 parts of flame-retardant toughening agent, 1.4 to 1.8 parts of antioxidant and 0.5 to 1.2 parts of stearic acid. According to the flame-retardant cable material and the preparation method thereof, by controlling the adding amount of the aramid fibers and the Sn0. 7Ce0. 3O2 fibers, the aramid fibers and the Sn0. 7Ce0. 3O2 fibers are entangled and agglomerated in a matrix of the flame-retardant cable material, the entangled fiber agglomerates can reduce pores in the cable material, and diffusion of oxygen and combustible materials in the combustion process is inhibited. Besides, the aramid fibers and the Sn0. 7Ce0. 3O2 fibers are matched and embedded into the carbon skeleton to form an enhanced network structure and form a highly-complete expanded carbon layer, so that the flame retardance of the flame-retardant cable material is further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cable materials, and particularly relates to a flame-retardant cable material and a preparation method thereof. BACKGROUND

[0002] In today's rapid development of science and technology and economy, with the massive use of electrical products and the heavy load transmission of cables, fire caused by electrical problems is becoming more and more common. Therefore, people pay more and more attention to the flame retardancy of cable materials, which requires the cable materials to have good flame retardancy. In order to improve the flame retardant of the cable material, a flame retardant is generally added to the cable material. The intumescent flame retardant is a new type of flame retardant, which has the advantages of non-toxicity and environmental friendliness. However, the intumescent flame retardant has the problems of easy water absorption and water separation. In addition, directly adding the intumescent flame retardant to the cable material will reduce the mechanical strength of the cable material. Therefore, there is an urgent need for a cable material with good flame retardancy and mechanical properties. SUMMARY

[0003] The first object of the present application is to provide a flame-retardant cable material to solve the technical problem that the addition of the intumescent flame retardant reduces the mechanical properties of the cable material.

[0004] The second object of the present application is to provide a preparation method of the flame-retardant cable material.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is as follows: A flame-retardant cable material, comprising the following raw materials in parts by mass: 60-90 parts of thermoplastic polyurethane elastomer, 20-25 parts of polyvinyl chloride, 15-20 parts of flame-retardant toughening agent, 1.4-1.8 parts of antioxidant, and 0.5-1.2 parts of stearic acid.

[0006] Further, the flame-retardant toughening agent comprises modified intumescent flame retardant, aramid fiber and Sn 0.7 Ce 0.3 O2 fiber, the mass ratio of the aramid fiber to Sn 0.7 Ce 0.3 O2 fiber is 8-6:2:4.

[0007] Further, the mass ratio of the aramid fiber to Sn 0.7 Ce 0.3 O2 fiber is 8-6:2:4.

[0008] Further, the length of the aramid fiber is 3-8 mm, and the diameter is 2-10 µm; the length of the Sn 0.7 Ce 0.3 O2 fiber is 15-25 mm, and the diameter is 8-20 µm.

[0009] Further, the preparation method of the modified intumescent flame retardant comprises the following steps: mixing the intumescent flame retardant with an ethanol solution of silane coupling agent, adjusting the pH to be acidic, filtering after warming reaction, and drying to obtain the modified intumescent flame retardant.

[0010] Further, the mass ratio of the intumescent flame retardant to the silane coupling agent is 8-10:1; the concentration of the silane coupling agent in the ethanol solution of the silane coupling agent is 0.02-0.08 g / mL; and the silane coupling agent is KH172.

[0011] Further, the pH adjusted to be acidic is 4.5-6; the temperature of the warming reaction is 60-75 DEG C, and the time of the warming reaction is 60-90 min.

[0012] Further, the antioxidant is one or more of antioxidant 168, antioxidant 2246, antioxidant 1076, and antioxidant 1010.

[0013] A preparation method of a flame-retardant cable material comprises the following steps: uniformly mixing a formula amount of the thermoplastic polyurethane elastomer and polyvinyl chloride, then adding a formula amount of the flame retardant, antioxidant and stearic acid, stirring at 130-140 DEG C and 3000-5000 r / min for 6-10 min, and then granulating to obtain the flame-retardant cable material.

[0014] The present application has the following advantages: The present application reduces the water absorption of the intumescent flame retardant by using the silane coupling agent to modify the hydrophobicity of the intumescent flame retardant. 0.7 Ce 0.3 The Sn

[0015] The present application adds the aramid fiber and Sn 0.7 Ce 0.3 O2 fiber in the flame-retardant cable material, which significantly improves the flame-retardant performance and mechanical properties of the flame-retardant cable material. 0.7 Ce 0.3 O2 fiber, so that the aramid fiber and Sn 0.7 Ce 0.3 O2 fiber are entangled and agglomerated in the matrix of the flame-retardant cable material. 0.7 Ce 0.3The "candle effect" is formed when the amount of O2 fibers is small, which reduces the flame retardant performance of the flame-retardant cable material. By controlling the proportion, diameter and length of the O2 fibers and Sn 0.7 Ce 0.3 O2 fibers, the long Sn 0.7 Ce 0.3 O2 fibers are wound and agglomerated in the cable material, and the short aramid fibers are filled in the pores, which can further inhibit the diffusion of oxygen and combustible materials during combustion, and enhance the flame retardant performance of the flame-retardant cable material. In addition, the aramid fibers and Sn 0.7 Ce 0.3 O2 fibers are embedded in the carbon skeleton to form a reinforced network structure, forming a highly complete expanded carbon layer, further improving the flame retardant performance of the flame-retardant cable material.

[0016] The aramid fibers have good mechanical properties, and the aramid fibers and Sn 0.7 Ce 0.3 O2 fibers form a continuous fiber layer on the surface of the flame-retardant cable material, which can increase the mechanical properties of the flame-retardant cable material, and Sn 0.7 Ce 0.3 O2 fibers have good catalytic activity and can catalyze the oxidation process of soot particles, having good smoke suppression effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The carbon layer morphology diagram of the flame-retardant cable material in Example 2. DETAILED DESCRIPTION

[0018] The application will be further described below in conjunction with the embodiments of the application and the accompanying drawings.

[0019] Sn 0.7 Ce 0.3 O2 fibers are prepared according to the preparation method in Enhanced Oxygen Vacancies in Ce-Doped SnO2 Nanofibers for Highly Efficient Soot Catalytic Combustion (Zhu, S.; Shi, S.; et al. Enhanced Oxygen Vacancies in Ce-Doped SnO2 Nanofibers for Highly Efficient Soot Catalytic Combustion. Catalysts 2022, 12, 596.).

[0020] The intumescent flame retardant includes ammonium polyphosphate APP, pentaerythritol PER and melamine MEL. Example 1

[0021] The flame-retardant cable material of Example 1 comprises the following raw materials: 75 kg of thermoplastic polyurethane elastomer, 22 kg of polyvinyl chloride, 15 kg of flame-retardant toughening agent, 1.5 kg of antioxidant, and 0.5 kg of stearic acid. The flame-retardant toughening agent comprises 12 kg of modified intumescent flame retardant, 0.6 kg of aramid fiber, and Sn... 0.7 Ce 0.3 O2 fiber 2.4 kg. Sn 0.7 Ce 0.3 The O2 fiber has a length of 15-25 mm and a diameter of 8-20 µm. The aramid fiber has a length of 3-8 mm and a diameter of 2-10 µm. The antioxidant is antioxidant 2246.

[0022] The preparation method of the modified intumescent flame retardant includes the following steps: 12 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, the pH is adjusted to 5 with glacial acetic acid, stirred for 20 min, then heated to 60 ℃ and reacted for 70 min. The precipitate is collected by filtration, washed three times with anhydrous ethanol, and dried at 80 ℃ for 2 h to obtain the final product. The concentration of silane coupling agent KH172 in the ethanol solution is 0.05 g / mL, and the mass of silane coupling agent KH172 is 1.3 kg.

[0023] The preparation method of the flame-retardant cable material in Example 1 includes the following steps: after mixing the thermoplastic polyurethane elastomer and polyvinyl chloride in the prescribed amount evenly, the flame-retardant toughening agent, antioxidant 2246 and stearic acid in the prescribed amount are added and stirred at 130 °C and 3500 r / min for 8 min, and then granulated to obtain the final product. Example 2

[0024] The flame-retardant cable material of Example 2 comprises the following raw materials: 60 kg of thermoplastic polyurethane elastomer, 25 kg of polyvinyl chloride, 18 kg of flame-retardant toughening agent, 1.8 kg of antioxidant, and 0.8 kg of stearic acid. The flame-retardant toughening agent comprises 12.6 kg of modified intumescent flame retardant, 2.16 kg of aramid fiber, and Sn... 0.7 Ce 0.3 O2 fiber 3.24 kg. Sn 0.7 Ce 0.3 The O2 fiber has a length of 15-25 mm and a diameter of 8-20 µm. The aramid fiber has a length of 3-8 mm and a diameter of 2-10 µm. The antioxidants are antioxidant 168 and antioxidant 1010, with antioxidant 168 weighing 1 kg and antioxidant 1010 weighing 0.8 kg.

[0025] The preparation method of the modified intumescent flame retardant comprises the following steps: 13 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, then the pH is adjusted to 5.5 using glacial acetic acid, stirred for 15 min, then heated to 68 ℃ for 90 min, then the precipitate is collected by filtration, the precipitate is washed with anhydrous ethanol for 2 times, and then dried at 95 ℃ for 1 h, and the modified intumescent flame retardant is obtained. The concentration of the silane coupling agent KH172 in the ethanol solution of the silane coupling agent KH172 is 0.07 g / mL, and the mass of the silane coupling agent KH172 is 1.6 kg.

[0026] The preparation method of the flame-retardant cable material of Example 2 comprises the following steps: the formula amount of the thermoplastic polyurethane elastomer and the polyvinyl chloride are uniformly mixed, then the formula amount of the flame-retardant toughening agent, the antioxidant 168, the antioxidant 1010 and the stearic acid are added, stirred at 140 ℃ and 5000 r / min for 8 min, and then granulated to obtain the flame-retardant cable material. Example 3

[0027] The flame-retardant cable material of Example 3 comprises the following raw materials: 80 kg of the thermoplastic polyurethane elastomer, 24 kg of the polyvinyl chloride, 18 kg of the flame-retardant toughening agent, 1.6 kg of the antioxidant and 1 kg of the stearic acid. The flame-retardant toughening agent comprises 11.7 kg of the modified intumescent flame retardant, 1.9 kg of the aramid fiber and 4.4 kg of the Sn 0.7 Ce 0.3 O2 fiber. The length of the Sn 0.7 Ce 0.3 O2 fiber is 15-25 mm, and the diameter is 8-20 µm. The length of the aramid fiber is 3-8 mm, and the diameter is 2-10 µm. The antioxidant is the antioxidant 2246.

[0028] The preparation method of the modified intumescent flame retardant comprises the following steps: 13 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, then the pH is adjusted to 4.5 using glacial acetic acid, stirred for 30 min, then heated to 70 ℃ for 60 min, then the precipitate is collected by filtration, the precipitate is washed with anhydrous ethanol for 5 times, and then dried at 100 ℃ for 2 h, and the modified intumescent flame retardant is obtained. The concentration of the silane coupling agent KH172 in the ethanol solution of the silane coupling agent KH172 is 0.08 g / mL, and the mass of the silane coupling agent KH172 is 1.3 kg.

[0029] The preparation method of the flame-retardant cable material of Example 3 comprises the following steps: the formula amount of the thermoplastic polyurethane elastomer and the polyvinyl chloride are uniformly mixed, then the formula amount of the flame-retardant toughening agent, the antioxidant 2246 and the stearic acid are added, stirred at 135 ℃ and 4000 r / min for 10 min, and then granulated to obtain the flame-retardant cable material. Example 4

[0030] The flame-retardant cable material of Example 4 comprises the following raw materials: thermoplastic polyurethane elastomer 90 kg, polyvinyl chloride 20 kg, flame-retardant toughening agent 20 kg, antioxidant 1.4 kg, and stearic acid 1.2 kg. The flame-retardant toughening agent comprises modified intumescent flame retardant 14 kg, aramid fiber 1.2 kg, and Sn 0.7 Ce 0.3 O2 fiber 4.8 kg. Sn 0.7 Ce 0.3 The length of the O2 fiber is 15-25 mm, and the diameter is 8-20 µm. The length of the aramid fiber is 3-8 mm, and the diameter is 2-10 µm. The antioxidant is antioxidant 1076.

[0031] The preparation method of the modified intumescent flame retardant comprises the following steps: after mixing 14 kg of intumescent flame retardant with an ethanol solution of silane coupling agent KH172, adjusting the pH to 6 using glacial acetic acid, stirring for 20 min, then heating to 75 ℃ for 60 min, then collecting the precipitate by filtration, washing the precipitate with anhydrous ethanol 5 times, and drying at 80 ℃ for 2 h. The concentration of silane coupling agent KH172 in the ethanol solution is 0.08 g / mL, and the mass of silane coupling agent KH172 is 1.5 kg.

[0032] The preparation method of the flame-retardant cable material of Example 4 comprises the following steps: uniformly mixing the formula amount of thermoplastic polyurethane elastomer and polyvinyl chloride, then adding the formula amount of flame-retardant toughening agent, antioxidant 1076, and stearic acid, stirring at 135 ℃ and 4000 r / min for 10 min, and then granulating to obtain the flame-retardant cable material.

[0033] Comparative Example 1 The flame-retardant cable material of Comparative Example 1 comprises the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, intumescent flame retardant 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The antioxidant is antioxidant 2246.

[0034] The preparation method of the flame-retardant cable material of Comparative Example 1 is the same as that of Example 1.

[0035] Comparative Example 2 The flame-retardant cable material of Comparative Example 2 comprises the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame-retardant toughening agent 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame-retardant toughening agent comprises intumescent flame retardant 12 kg, aramid fiber 0.6 kg, and Sn 0.7 Ce 0.3 O2 fiber 2.4 kg. Sn 0.7 Ce 0.3The length of the O2 fibers was 15-25 mm and the diameter was 8-20 pm. The length of the aramid fibers was 3-8 mm and the diameter was 2-10 pm. The antioxidant was antioxidant 2246.

[0036] The flame retardant cable compound of Comparative Example 2 was prepared in the same manner as Example 1.

[0037] Comparative Example 3 The flame retardant cable compound of Comparative Example 3 included the following ingredients: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame retardant toughener 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame retardant toughener included modified intumescent flame retardant 12 kg, aramid fibers 0.6 kg, and Sn 0.7 Ce 0.3 O2 fibers 2.4 kg. Sn 0.7 Ce 0.3 The length of the O2 fibers and the length of the aramid fibers were both 15-25 mm and the diameter was both 8-20 pm. The antioxidant was antioxidant 2246. The modified intumescent flame retardant was prepared in the same manner as Example 1.

[0038] The flame retardant cable compound of Comparative Example 3 was prepared in the same manner as Example 1.

[0039] Comparative Example 4 The flame retardant cable compound of Comparative Example 4 included the following ingredients: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame retardant toughener 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame retardant toughener included modified intumescent flame retardant 12 kg, aramid fibers 0.6 kg, and Sn 0.7 Ce 0.3 O2 fibers 2.4 kg. Sn 0.7 Ce 0.3 The length of the O2 fibers and the length of the aramid fibers were both 3-8 mm and the diameter was both 2-10 pm. The antioxidant was antioxidant 2246. The modified intumescent flame retardant was prepared in the same manner as Example 1.

[0040] The flame retardant cable compound of Comparative Example 4 was prepared in the same manner as Example 1.

[0041] Comparative Example 5 The flame retardant cable compound of Comparative Example 5 included the following ingredients: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame retardant toughener 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame retardant toughener included modified intumescent flame retardant 12.75 kg, aramid fibers 0.45 kg, and Sn 0.7 Ce 0.3 O2 fibers 1.8 kg. Sn0.7 Ce 0.3 O2fibres 4.8 kg. Sn 0.7 Ce 0.3 O2fibres 4.8 kg. Sn 0.7 Ce 0.3 The length of the O2fibres was 15-25 mm and the diameter was 8-20 pm. The length of the aramid fibres was 3-8 mm and the diameter was 2-10 pm. The antioxidant was antioxidant 2246. The method of preparation of the modified intumescent flame retardant was the same as in Example 1.

[0042] The flame retardant cable compound of Comparative Example 5 was prepared in the same way as in Example 1.

[0043] Comparative Example 6 The flame retardant cable compound of Comparative Example 6 comprised the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame retardant toughener 15 kg, antioxidant 1.5 kg and stearic acid 0.5 kg. The flame retardant toughener comprised modified intumescent flame retardant 9 kg, aramid fibres 1.2 kg and Sn 0.7 Ce 0.3 O2fibres 4.8 kg. Sn 0.7 Ce 0.3 The length of the O2fibres was 15-25 mm and the diameter was 8-20 pm. The length of the aramid fibres was 3-8 mm and the diameter was 2-10 pm. The antioxidant was antioxidant 2246. The method of preparation of the modified intumescent flame retardant was the same as in Example 1.

[0044] The flame retardant cable compound of Comparative Example 6 was prepared in the same way as in Example 1.

[0045] Comparative Example 7 The flame retardant cable compound of Comparative Example 7 comprised the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame retardant toughener 15 kg, antioxidant 1.5 kg and stearic acid 0.5 kg. The flame retardant toughener comprised modified intumescent flame retardant 12 kg, aramid fibres 1.5 kg and Sn 0.7 Ce 0.3 O2fibres 4.8 kg. Sn 0.7 Ce 0.3 The length of the O2fibres was 15-25 mm and the diameter was 8-20 pm. The length of the aramid fibres was 3-8 mm and the diameter was 2-10 pm. The antioxidant was antioxidant 2246. The method of preparation of the modified intumescent flame retardant was the same as in Example 1.

[0046] The flame retardant cable compound of Comparative Example 7 was prepared in the same way as in Example 1.

[0047] Comparative Example 8 The flame-retardant cable material of Comparative Example 8 comprises the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame-retardant toughening agent 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame-retardant toughening agent comprises modified intumescent flame retardant 12 kg, aramid fiber 3 kg. The length of the aramid fiber is 3-8 mm, and the diameter is 2-10 µm. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as that of Example 1.

[0048] The preparation method of the flame-retardant cable material of Comparative Example 8 is the same as that of Example 1.

[0049] Comparative Example 9 The flame-retardant cable material of Comparative Example 9 comprises the following raw materials: thermoplastic polyurethane elastomer 75 kg, polyvinyl chloride 22 kg, flame-retardant toughening agent 15 kg, antioxidant 1.5 kg, and stearic acid 0.5 kg. The flame-retardant toughening agent comprises modified intumescent flame retardant 12 kg, Sn 0.7 Ce 0.3 O2 fiber 3 kg. The Sn 0.7 Ce 0.3 O2 fiber has a length of 15-25 mm and a diameter of 8-20 µm. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as that of Example 1.

[0050] The preparation method of the flame-retardant cable material of Comparative Example 9 is the same as that of Example 1.

[0051] Test Example The flame-retardant properties of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 were tested according to GB / T2408-2021; The limiting oxygen index of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 was determined according to GB / T2406.2-2009 Plastic Determination of Burning Behavior Oxygen Index Method Part 2: Room Temperature Test; The tensile strength of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 was tested according to GB / T528-2009; The notched impact strength of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 was tested according to GB / T1043.1-2008; The test results are shown in Table 1.

[0052] Table 1 Performance test of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 Sample Limiting oxygen index / % Vertical burning rating (UL-94) Tensile strength / MPa impact strength (kJ / m 2 ) Example 1 33.2 V-0 30.9 16.7 Example 2 34.1 V-0 30.8 17.3 Example 3 33.5 V-0 32.2 19.2 Example 4 33.1 V-0 32.3 19.0 Comparative Example 1 26.2 V-1 25.7 10.3 Comparative Example 2 31.3 V-0 29.7 16.0 Comparative Example 3 30.9 V-0 30.8 16.5 Comparative Example 4 27.6 V-0 25.6 12.6 Comparative Example 5 20.3 V-1 29.7 14.9 Comparative Example 6 29.9 V-0 27.5 14.6 Comparative Example 7 30.8 V-0 27.9 14.4 Comparative Example 8 25.4 V-0 26.4 15.1 Comparative Example 9 26.8 V-0 30.2 16.3 As can be seen from Table 1, the mechanical properties and flame-retardant properties of the flame-retardant cable material of Comparative Example 1 directly adding the intumescent flame retardant are poor. In Comparative Example 2, the unmodified intumescent flame retardant is used, the unmodified intumescent flame retardant has the performance of easy water absorption, the intumescent flame retardant migrates, and the flame-retardant property of the flame-retardant cable material of Comparative Example 2 is reduced. In Comparative Examples 3 and 4, the fibers with single diameter and length are used, there are gaps between the fiber bundles, the diffusion space of oxygen and combustible is large, and a continuous fiber layer is not formed, which reduces the mechanical properties and flame-retardant properties of the flame-retardant cable material. In Comparative Example 5, the amount of fiber is small, the less fiber plays the role of “wick” in the flame-retardant cable material, and the flame-retardant property of the flame-retardant cable material of Comparative Example 5 is further reduced. When the amount of fiber is large, the fiber is wound and aggregated to reduce the diffusion of oxygen and combustible. In Comparative Example 7, the content of short aramid fiber is high, and a stress concentration point occurs, which reduces the mechanical properties of the flame-retardant cable material of Comparative Example 7. In Comparative Example 8, the short aramid fiber with single size is used, and the stress concentration point also occurs in the short aramid fiber in the cable material, which reduces the mechanical properties of the flame-retardant cable material of Comparative Example 8. In Comparative Example 9, the long aramid fiber with single size is used, and the flame-retardant property is poor.

[0053] The carbon layer morphology after the cone calorimeter test is shown in Figure 1 As can be seen from Figure 1 , the carbon layer formed in Example 2 is continuous and complete without obvious holes and cracks, which is due to the winding and aggregation of the long Sn 0.7 Ce 0.3 O2 fiber in the cable material, and the short aramid fiber is filled in the pores, which reduces the pores in the flame-retardant cable material, so that the carbon layer formed in Example 2 is dense and complete, the diffusion of oxygen and combustible is avoided, and the flame-retardant property of the flame-retardant cable material of the present application is increased.

[0054] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the specification and practice of the present disclosure. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including modifications and equivalents of the present disclosure that are obvious to those skilled in the art. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0055] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, the patent protection scope of the present application is subject to the claims, any equivalent structural changes made by using the content of the specification of the present application should be included in the protection scope of the present application.

Claims

1. A flame-retardant cable material, characterized in that, The raw materials include the following by weight: 60-90 parts thermoplastic polyurethane elastomer, 20-25 parts polyvinyl chloride, 15-20 parts flame retardant toughening agent, 1.4-1.8 parts antioxidant and 0.5-1.2 parts stearic acid.

2. The flame-retardant cable material according to claim 1, characterized in that, The flame-retardant toughening agent includes a modified intumescent flame retardant, aramid fiber, and Sn. 0.7 Ce 0.3 O2 fiber, the aramid fiber and Sn 0.7 Ce 0.3 O2 fibers account for 20-35% of the total mass of the flame retardant toughening agent.

3. The flame-retardant cable material according to claim 2, characterized in that, The Sn 0.7 Ce 0.3 The mass ratio of O2 fiber to aramid fiber is 8-6:2-4.

4. The flame-retardant cable material according to claim 2 or 3, characterized in that, The aramid fiber has a length of 3-8 mm and a diameter of 2-10 µm; the Sn 0.7 Ce 0.3 The O2 fibers are 15-25 mm in length and 8-20 µm in diameter.

5. The flame-retardant cable material according to claim 2, characterized in that, The preparation method of the modified intumescent flame retardant includes: mixing the intumescent flame retardant with an ethanol solution of a silane coupling agent, adjusting the pH to acidic, heating and reacting, filtering, and drying to obtain the product.

6. The flame-retardant cable material according to claim 5, characterized in that, The mass ratio of the intumescent flame retardant to the silane coupling agent is 8-10:1; the concentration of the silane coupling agent in the ethanol solution of the silane coupling agent is 0.02-0.08 g / mL; the silane coupling agent is KH172.

7. The flame-retardant cable material according to claim 5, characterized in that, The pH is adjusted to an acidic level of 4.5-6; the temperature of the heating reaction is 60-75 ℃, and the heating reaction time is 60-90 min.

8. The flame-retardant cable material according to claim 1, characterized in that, The antioxidant is one or more of antioxidant 168, antioxidant 2246, antioxidant 1076, and antioxidant 1010.

9. A method for preparing the flame-retardant cable material as described in claim 1, characterized in that, The process includes the following steps: After mixing the thermoplastic polyurethane elastomer and polyvinyl chloride in the prescribed amounts evenly, the flame retardant toughening agent, antioxidant and stearic acid in the prescribed amounts are added and stirred at 130-140 ℃ and 3000-5000 r / min for 6-10 min, followed by granulation.

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