A flame-retardant cable material and a method for producing the same

Abstract

This invention relates to a flame-retardant cable material and its preparation method, belonging to the field of cable technology. The flame-retardant cable material comprises the following raw materials by weight: 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. This invention achieves this by controlling the amount of aramid fiber and Sn... 0.7 Ce 0.3 The amount of O2 fiber added makes the aramid fiber and Sn... 0.7 Ce 0.3 O2 fibers entangle and agglomerate within the matrix of flame-retardant cable materials. These entangled fiber clusters reduce the porosity within the cable material, inhibiting the diffusion of oxygen and combustibles during combustion. Furthermore, aramid fibers and Sn... 0.7 Ce 0.3 O2 fibers are embedded in the carbon skeleton to form an enhanced network structure, creating a highly intact expanded carbon layer, which further improves the flame retardancy of the flame-retardant cable material.

Description

Technical Field

[0001] This invention belongs to the field of cable material technology, specifically relating to a flame-retardant cable material and its preparation method. Background Technology

[0002] In today's rapidly developing technological and economic landscape, with the widespread use of electrical products and the heavy load transmission of cables, fires caused by electrical problems are becoming increasingly common. Therefore, people are paying more and more attention to the flame retardancy of cable materials, which requires cable materials to have good flame retardancy. To improve the flame retardancy of cable materials, flame retardants are generally added. Intumescent flame retardants are a new type of flame retardant with advantages such as being non-toxic and environmentally friendly. However, intumescent flame retardants have the problem of easily absorbing water and leaching out when exposed to water. In addition, directly adding intumescent flame retardants to cable materials will reduce the mechanical strength of the cable materials. Therefore, there is an urgent need for a cable material with good flame retardancy and good mechanical properties. Summary of the Invention

[0003] The first objective of this invention is to provide a flame-retardant cable material to solve the technical problem that the addition of intumescent flame retardants reduces the mechanical properties of the cable material.

[0004] The second objective of this invention is to provide a method for preparing flame-retardant cable material.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A flame-retardant cable material comprises the following raw materials by weight: 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.

[0007] Furthermore, 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.

[0008] Furthermore, the aramid fiber and Sn 0.7 Ce 0.3 The mass ratio of O2 fibers is 8-6:2:4.

[0009] Furthermore, 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.

[0010] Furthermore, 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 the reaction, filtering, and drying to obtain the product.

[0011] Furthermore, 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.

[0012] Furthermore, the pH is adjusted to an acidic level of 4.5-6; the temperature of the heating reaction is 60-75 °C, and the heating reaction time is 60-90 min.

[0013] Furthermore, the antioxidant is one or more of antioxidant 168, antioxidant 2246, antioxidant 1076, and antioxidant 1010.

[0014] A method for preparing a flame-retardant cable material includes the following steps: mixing the thermoplastic polyurethane elastomer and polyvinyl chloride in the prescribed amounts evenly, then adding the flame retardant, antioxidant and stearic acid in the prescribed amounts, stirring at 130-140 ℃ and 3000-5000 r / min for 6-10 min, and then granulating to obtain the final product.

[0015] The beneficial effects of this invention are:

[0016] This invention reduces the water absorption of intumescent flame retardants by using silane coupling agents to hydrophobically modify them. Ammonium polyphosphate in the intumescent flame retardant decomposes into dehydrated substances, promoting the dehydration and carbonization of pentaerythritol. Pentaerythritol undergoes dehydration and cross-linking under the action of ammonium polyphosphate, forming a stable carbon network. Furthermore, Sn... 0.7 Ce 0.3 O2 fibers can function as a metal catalyst for carbonization, which helps in the formation of carbon layers.

[0017] The flame-retardant cable material of this invention incorporates aramid fiber and Sn. 0.7 Ce 0.3 O2 fibers significantly improve the flame-retardant and mechanical properties of flame-retardant cable materials. This is achieved by controlling the amount of aramid fibers and Sn... 0.7 Ce 0.3 The addition of O2 fiber makes the aramid fiber and Sn... 0.7 Ce 0.3 O2 fibers entangle and agglomerate within the matrix of flame-retardant cable materials. These entangled fiber clusters reduce the porosity of the cable material, inhibiting the diffusion of oxygen and combustibles during combustion. Aramid fibers and Sn... 0.7 Ce 0.3Insufficient O2 fiber addition can create a "wick" effect, weakening the flame-retardant properties of the flame-retardant cable material. This can be mitigated by controlling the amount of aramid fiber and Sn... 0.7 Ce 0.3 The proportion, diameter, and length of O2 fibers, and the long Sn fibers. 0.7 Ce 0.3 O2 fibers entangle and agglomerate within the cable material, while short aramid fibers fill the pores, further inhibiting the diffusion of oxygen and combustibles during combustion and enhancing the flame-retardant properties of the cable material. Furthermore, aramid fibers and Sn... 0.7 Ce 0.3 O2 fibers are embedded in the carbon skeleton to form an enhanced network structure, creating a highly intact expanded carbon layer, which further improves the flame retardancy of the flame-retardant cable material.

[0018] Aramid fibers have good mechanical properties, and aramid fibers and Sn 0.7 Ce 0.3 O2 fibers form a continuous fiber layer on the surface of flame-retardant cable material. On one hand, this continuous fiber layer increases the mechanical properties of the flame-retardant cable material; on the other hand, Sn... 0.7 Ce 0.3 O2 fiber has good catalytic activity and can catalyze the oxidation process of soot particles, thus having a good smoke suppression effect. Attached Figure Description

[0019] Figure 1 This is a diagram showing the morphology of the carbon layer in the flame-retardant cable material of Example 2. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0021] Sn 0.7 Ce 0.3 O2 fibers were prepared according to the method described in the literature "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.).

[0022] Intumescent flame retardants include ammonium polyphosphate (APP), pentaerythritol (PER), and melamine (MEL). Example 1

[0023] 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.

[0024] 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.

[0025] 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

[0026] 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.

[0027] The preparation method of the modified intumescent flame retardant includes the following steps: 13 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, the pH is adjusted to 5.5 with glacial acetic acid, stirred for 15 min, then heated to 68 ℃ and reacted for 90 min. The precipitate is then collected by filtration, washed twice with anhydrous ethanol, and dried at 95 ℃ for 1 h to obtain the final product. The concentration of silane coupling agent KH172 in the ethanol solution is 0.07 g / mL, and the mass of silane coupling agent KH172 is 1.6 kg.

[0028] The preparation method of the flame-retardant cable material in Example 2 includes the following steps: after mixing the thermoplastic polyurethane elastomer and polyvinyl chloride in the prescribed amount evenly, the flame-retardant toughening agent, antioxidant 168, antioxidant 1010 and stearic acid in the prescribed amount are added and stirred at 140 °C and 5000 r / min for 8 min, and then granulated to obtain the final product. Example 3

[0029] The flame-retardant cable material of Example 3 comprises the following raw materials: 80 kg of thermoplastic polyurethane elastomer, 24 kg of polyvinyl chloride, 18 kg of flame-retardant toughening agent, 1.6 kg of antioxidant, and 1 kg of stearic acid. The flame-retardant toughening agent includes 11.7 kg of modified intumescent flame retardant, 1.9 kg of aramid fiber, and Sn... 0.7 Ce 0.3 O2 fiber 4.4 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.

[0030] The preparation method of the modified intumescent flame retardant includes the following steps: 13 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, the pH is adjusted to 4.5 with glacial acetic acid, stirred for 30 min, then heated to 70 ℃ and reacted for 60 min. The precipitate is then collected by filtration, washed five times with anhydrous ethanol, and dried at 100 ℃ for 2 h to obtain the final product. 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 1.3 kg.

[0031] The preparation method of the flame-retardant cable material in Example 3 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 135 °C and 4000 r / min for 10 min, and then granulated to obtain the final product. Example 4

[0032] Example 4's flame-retardant cable material comprises the following raw materials: 90 kg of thermoplastic polyurethane elastomer, 20 kg of polyvinyl chloride, 20 kg of flame-retardant toughening agent, 1.4 kg of antioxidant, and 1.2 kg of stearic acid. The flame-retardant toughening agent includes 14 kg of modified intumescent flame retardant, 1.2 kg of aramid fiber, and Sn... 0.7 Ce 0.3 4.8 kg of O2 fiber. 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 1076.

[0033] The preparation method of the modified intumescent flame retardant includes the following steps: 14 kg of the intumescent flame retardant is mixed with an ethanol solution of silane coupling agent KH172, the pH is adjusted to 6 with glacial acetic acid, and the mixture is stirred for 20 min. The mixture is then heated to 75 ℃ and reacted for 60 min. The precipitate is then collected by filtration, washed five 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 0.08 g / mL, and the mass of silane coupling agent KH172 is 1.5 kg.

[0034] The preparation method of the flame-retardant cable material in Example 4 includes the following steps: after mixing the thermoplastic polyurethane elastomer and polyvinyl chloride in the prescribed amount evenly, the flame-retardant toughening agent, antioxidant 1076 and stearic acid in the prescribed amount are added and stirred at 135 °C and 4000 r / min for 10 min, and then granulated to obtain the final product.

[0035] Comparative Example 1

[0036] The flame-retardant cable material of Comparative Example 1 comprises the following raw materials: 75 kg of thermoplastic polyurethane elastomer, 22 kg of polyvinyl chloride, 15 kg of intumescent flame retardant, 1.5 kg of antioxidant, and 0.5 kg of stearic acid. The antioxidant is antioxidant 2246.

[0037] The preparation method of the flame-retardant cable material in Comparative Example 1 is the same as that in Example 1.

[0038] Comparative Example 2

[0039] Comparative Example 2's flame-retardant cable material 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 includes 12 kg of intumescent flame retardant, 0.6 kg of aramid fiber, and Sn... 0.7 Ce 0.3 O2 fiber 2.4 kg. Sn0.7 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.

[0040] The preparation method of the flame-retardant cable material in Comparative Example 2 is the same as that in Example 1.

[0041] Comparative Example 3

[0042] Comparative Example 3's flame-retardant cable material 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 includes 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 Both the O2 fiber and the aramid fiber have 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 in Example 1.

[0043] The preparation method of the flame-retardant cable material in Comparative Example 3 is the same as that in Example 1.

[0044] Comparative Example 4

[0045] Comparative Example 4's flame-retardant cable material 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 includes 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 Both the O2 fiber and the aramid fiber have a length of 3-8 mm and a diameter of 2-10 µm. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0046] The preparation method of the flame-retardant cable material in Comparative Example 4 is the same as that in Example 1.

[0047] Comparative Example 5

[0048] Comparative Example 5's flame-retardant cable material 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 includes 12.75 kg of modified intumescent flame retardant, 0.45 kg of aramid fiber, and Sn... 0.7 Ce 0.3 1.8 kg of O2 fiber. Sn 0.7 Ce 0.3 The O2 fibers are 15-25 mm in length and 8-20 µm in diameter. The aramid fibers are 3-8 mm in length and 2-10 µm in diameter. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0049] The preparation method of the flame-retardant cable material in Comparative Example 5 is the same as that in Example 1.

[0050] Comparative Example 6

[0051] Comparative Example 6's flame-retardant cable material 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 includes 9 kg of modified intumescent flame retardant, 1.2 kg of aramid fiber, and Sn... 0.7 Ce 0.3 4.8 kg of O2 fiber. Sn 0.7 Ce 0.3 The O2 fibers are 15-25 mm in length and 8-20 µm in diameter. The aramid fibers are 3-8 mm in length and 2-10 µm in diameter. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0052] The preparation method of the flame-retardant cable material in Comparative Example 6 is the same as that in Example 1.

[0053] Comparative Example 7

[0054] Comparative Example 7's flame-retardant cable material 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 includes 12 kg of modified intumescent flame retardant, 1.5 kg of aramid fiber, and Sn... 0.7 Ce 0.3 1.5 kg of O2 fiber. Sn 0.7 Ce 0.3The O2 fibers are 15-25 mm in length and 8-20 µm in diameter. The aramid fibers are 3-8 mm in length and 2-10 µm in diameter. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0055] The preparation method of the flame-retardant cable material in Comparative Example 7 is the same as that in Example 1.

[0056] Comparative Example 8

[0057] The flame-retardant cable material of Comparative Example 8 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 and 3 kg of aramid fiber. The aramid fiber has a length of 3-8 mm and a diameter of 2-10 µm. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0058] The preparation method of the flame-retardant cable material in Comparative Example 8 is the same as that in Example 1.

[0059] Comparative Example 9

[0060] Comparative Example 9's flame-retardant cable material 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 includes 12 kg of modified intumescent flame retardant and Sn... 0.7 Ce 0.3 O2 fiber 3 kg. Sn 0.7 Ce 0.3 The O2 fibers are 15-25 mm in length and 8-20 µm in diameter. The antioxidant is antioxidant 2246. The preparation method of the modified intumescent flame retardant is the same as in Example 1.

[0061] The preparation method of the flame-retardant cable material in Comparative Example 9 is the same as that in Example 1.

[0062] Test case

[0063] The flame retardancy of the flame-retardant cable materials of Examples 1-4 and Comparative Examples 1-9 was tested according to GB / T2408-2021.

[0064] The limiting oxygen index of flame-retardant cable materials in Examples 1-4 and Comparative Examples 1-9 was determined according to GB / T2406.2-2009, Oxygen Index Method for Plastics - Part 2: Room Temperature Test.

[0065] 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.

[0066] 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.

[0067] The test results are shown in Table 1.

[0068] Table 1 Performance tests of flame-retardant cable materials in Examples 1-4 and Comparative Examples 1-9

[0069] sample Limiting oxygen index / % Vertical flammability rating (UL-94) Tensile strength / MPa <![CDATA[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

[0070] As shown in Table 1, the flame-retardant cable material with directly added intumescent flame retardant in Comparative Example 1 exhibits poor mechanical and flame-retardant properties. Comparative Example 2 uses an unmodified intumescent flame retardant, which readily absorbs water, leading to migration and reduced flame-retardant properties. Comparative Examples 3 and 4 use fibers of a single diameter and length, resulting in gaps between the wound fiber clusters. This creates a large space for oxygen and combustible material diffusion and prevents the formation of a continuous fiber layer, further reducing the mechanical and flame-retardant properties of the cable material. Comparative Example 5 has a low fiber content; these few fibers act as a "wick" in the flame-retardant cable material, further reducing its flame-retardant performance. Higher fiber content leads to fiber entanglement and agglomeration, reducing oxygen and combustible material diffusion. Comparative Example 7 has a high content of short aramid fibers, resulting in stress concentration points and reducing the mechanical properties of the flame-retardant cable material. Comparative Example 8 used short aramid fibers of a single size. The short aramid fibers also resulted in stress concentration points in the cable material, reducing the mechanical properties of the flame-retardant cable material in Comparative Example 8. Comparative Example 9 used long aramid fibers of a single size, resulting in poor flame retardancy.

[0071] The morphology of the carbon layer after testing with a cone calorimeter is as follows: Figure 1 As shown, from Figure 1 As can be seen, the carbon layer formed in Example 2 is continuous and intact, without obvious pores or cracks. This is due to the long Sn... 0.7 Ce 0.3 O2 fibers entangle and agglomerate in the cable material, and short aramid fibers fill the pores, reducing the porosity inside the flame-retardant cable material. This makes the carbon layer formed in Example 2 dense and complete, preventing the diffusion of oxygen and combustibles, and increasing the flame-retardant performance of the flame-retardant cable material of the present invention.

[0072] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. A flame-retardant cable material, characterized in that, The product comprises the following raw materials 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; 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 fiber accounts for 20-35% of the total mass of the flame retardant toughening agent; The aramid fiber has a length of 3-8 mm, and the Sn... 0.7 Ce 0.3 The O2 fiber has a length of 15-25 mm; the aramid fiber has a diameter of 2-10 µm; and the Sn... 0.7 Ce 0.3 The diameter of O2 fibers is 8-20 µm; The Sn 0.7 Ce 0.3 The mass ratio of O2 fiber to aramid fiber is 8-6:2-4; 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; The silane coupling agent is KH172.

2. The flame-retardant cable material according to claim 1, 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.

3. The flame-retardant cable material according to claim 1, 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.

4. 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.

5. 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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