Impact-resistant fireproof cable and preparation method thereof

Abstract

The invention discloses an impact-resistant fireproof cable and a preparation method thereof, and belongs to the technical field of cables. The cable comprises a cable core and a protective sleeve, and the preparation method of the cable comprises the following steps: taking syndiotactic polypropylene, modified lignin, sulfur, di-tert-butylperoxy isopropyl benzene, modified epoxy resin, a 650 epoxy curing agent, talcum powder, an antioxidant 168, an ultraviolet light absorber UV-360, stearic acid and a piperazine phosphate flame retardant, adding into a high-speed mixer, mixing, cooling, and carrying out extrusion molding to obtain the cable. And transferring into a twin-screw extruder, extruding and coating the outer surface of the cable core, cooling and shaping to form the protective sleeve coating the outer surface of the cable core, thereby obtaining the cable with excellent impact resistance and fireproof performance.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to an impact-resistant and fire-proof cable and a preparation method thereof. Background Art

[0002] Cables are usually wrapped in a protective sheath, which is a key barrier to protect the safety of the internal cable core structure. It ensures that the cable is protected from mechanical damage and external environmental damage during and after installation. In order to enhance the fire resistance of the protective sheath, people will choose materials with excellent fire retardant properties for manufacturing. However, in addition to improving the fire resistance, it is also necessary to consider the damage that other external factors may cause to the insulating sheath. For example, during the transportation and installation of the cable, it may encounter mechanical shocks such as extrusion and collision. In order to prevent the cable from suffering mechanical damage during laying or operation, protect its structural integrity and electrical safety performance, and extend the service life of the cable, the cable protective sheath must have a certain impact resistance to withstand these external forces without damage. Therefore, it is an urgent need for economic and social development to put forward more stringent and diversified requirements for cable performance indicators and continuously optimize the comprehensive performance of the cable. Summary of the invention

[0003] The object of the present invention is to provide an impact-resistant fireproof cable and a preparation method thereof, so as to improve the impact resistance of the cable and prevent the cable from being damaged by external mechanical forces.

[0004] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing an impact-resistant fireproof cable, the cable comprising a cable core and a protective sheath, the cable preparation method comprising the following steps: Syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, piperazine phosphate flame retardant (purchased from Yunnan Fushi Technology Co., Ltd.) are added into a high-speed mixer, mixed, cooled, transferred to a twin-screw extruder for extrusion and coated on the outer surface of the cable core, cooled and shaped to form the protective sheath coated on the outer surface of the cable core, and the cable is obtained.

[0005] As a preferred technical solution of the present invention, the mass ratio of the syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 35-42: 2-4: 0.2-0.4: 0.1-0.2: 10-15: 0.8-1.2: 2-3: 1-2: 1-2: 0.5-0.8: 1-2;.

[0006] As a preferred technical solution of the present invention, the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a 95°C water bath for 1-2 hours, add cordierite powder, adjust the pH to 7.5-7.8, ultrasonically stir for 20-30 minutes, add silane coupling agent KH-550, stir for 4-6 hours, filter and separate, take the solid phase and dry it to obtain material A; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicarbaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 10-12 minutes, stand at room temperature for 30-40 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; S3, taking the material C, xylene, and n-butanol, mixing them, ultrasonically dispersing them for 30-40 minutes, adding bisphenol A epoxy resin E51 (purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd.), and stirring for 30-40 minutes to obtain the modified epoxy resin.

[0007] As a preferred technical solution of the present invention, in step S1, the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.5-1.8:200-300:1-1.2:0.1-0.12.

[0008] As a preferred technical solution of the present invention, in step S2, the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicarbaldehyde, acetonitrile and acetic acid is 0.2-0.3 g:50 mL:0.14-0.15 g:0.11-0.12 g:50 mL:2-3 mL.

[0009] As a preferred technical solution of the present invention, in step S3, the mass ratio of the material C, xylene, n-butanol, and bisphenol A epoxy resin E51 is 1-1.5:0.5-0.7:0.2-0.3:15.

[0010] As a preferred technical solution of the present invention, the preparation method of the modified lignin comprises the following steps: Take lignin (purchased from Shanghai Yuanye Biotechnology Co., Ltd.) and dry it at 105°C to constant weight, then transfer it to a high-speed mixer, add caprolactone, stir for 10-20 minutes, then transfer it to a forced air drying oven and keep it at 120°C for 3-4 hours, cool it, crush it, and pass it through a 200-mesh sieve to obtain the modified lignin.

[0011] As a preferred technical solution of the present invention, the mass ratio of lignin to caprolactone is 4-6:1-1.5.

[0012] The impact-resistant and fire-proof cable is prepared by the above-mentioned preparation method.

[0013] Beneficial effects of the present invention: The impact-resistant fireproof cable and its preparation method disclosed in the present invention optimize the formula composition, select syndiotactic polypropylene and modified lignin to form a cross-linked structure, so as to play an impact-resistant role; in addition, lignin can also be used together with modified epoxy resin as a carbonizing agent to block heat from diffusing into the interior of the cable, so as to play a fire-proof effect. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0015] An impact-resistant fireproof cable and a preparation method thereof, the cable comprising a cable core and a protective sheath, the preparation method of the cable comprising the following steps: Take syndiotactic polypropylene (the syndiotactic polypropylene is obtained by polymerization of propylene under the action of a metallocene catalyst, the syndiotacticity is 90%, and the melt flow rate (230°C, 2.16kg) is 10g / 10min), modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, piperazine phosphate flame retardant and add them into a high-speed mixer, mix and cool, transfer to a twin-screw extruder for extrusion and coating on the outer surface of the cable core, cool and shape, form the protective sheath coated on the outer surface of the cable core, and obtain the cable; the mixing refers to mixing at 110°C for 8min; the temperature of the extrusion process is 150°C, and the speed of the screw main engine is 60rpm; The mass ratio of the syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 35:2:0.2:0.1:10:0.8:2:1:1:0.5:1; The preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1 h, add cordierite powder, adjust the pH to 7.5, stir ultrasonically for 20 min, add silane coupling agent KH-550, stir for 4 h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.5:200:1:0.1; S2, take the material A and methanol, mix them, ultrasonically stir for 20 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedical, and acetonitrile, mix them, ultrasonically stir for 30 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 10 minutes, let stand at room temperature for 30 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedical, acetonitrile, and acetic acid is 0.2g:50mL:0.14g:0.11g:50mL:2mL; S3, taking the material C, xylene, and n-butanol, mixing, ultrasonically dispersing for 30 minutes, adding bisphenol A epoxy resin E51, stirring for 30 minutes, and obtaining the modified epoxy resin; the mass ratio of the material C, xylene, n-butanol, and bisphenol A epoxy resin E51 is 1:0.5:0.2:15; The preparation method of the modified lignin comprises the following steps: Take lignin and dry it at 105°C to constant weight, then transfer it to a high-speed mixer, add caprolactone, stir for 10 minutes, then transfer it to a forced air drying oven and keep it at 120°C for 3 hours, cool it, crush it, and pass it through a 200-mesh sieve to obtain the modified lignin; the mass ratio of the lignin to caprolactone is 4:1.

[0016] An impact-resistant fireproof cable and a preparation method thereof, the cable comprising a cable core and a protective sheath, the preparation method of the cable comprising the following steps: Take syndiotactic polypropylene (the syndiotactic polypropylene is obtained by polymerization of propylene under the action of a metallocene catalyst, and the syndiotacticity is 93%, and the melt flow rate (230°C, 2.16kg) is 11g / 10min), modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, piperazine phosphate flame retardant and add them into a high-speed mixer, mix and knead, cool, transfer to a twin-screw extruder for extrusion and coating on the outer surface of the cable core, cool and shape, and form the protective sheath coated on the outer surface of the cable core, so as to obtain the cable; the mixing refers to mixing at 120°C for 9min; the temperature of the extrusion process is 175°C, and the speed of the screw main engine is 70rpm; The mass ratio of the syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 38:3:0.3:0.15:12:1:2.5:1.5:1.5:0.65:1.5; The preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 7.7, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3, taking the material C, xylene, and n-butanol, mixing, ultrasonically dispersing for 35 minutes, adding bisphenol A epoxy resin E51, stirring for 35 minutes, and obtaining the modified epoxy resin; the mass ratio of the material C, xylene, n-butanol, and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15; The preparation method of the modified lignin comprises the following steps: Take lignin and dry it at 105°C to constant weight, then transfer it to a high-speed mixer, add caprolactone, stir for 15 minutes, then transfer it to a forced air drying oven and keep it at 120°C for 3.5 hours, cool it, crush it, and pass it through a 200-mesh sieve to obtain the modified lignin; the mass ratio of the lignin to caprolactone is 5:1.2.

[0017] An impact-resistant fireproof cable and a preparation method thereof, the cable comprising a cable core and a protective sheath, the preparation method of the cable comprising the following steps: Take syndiotactic polypropylene (the syndiotactic polypropylene is obtained by polymerization of propylene under the action of a metallocene catalyst, the syndiotacticity is 95%, and the melt flow rate (230°C, 2.16kg) is 12g / 10min), modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, piperazine phosphate flame retardant and add them into a high-speed mixer, mix and cool, transfer to a twin-screw extruder for extrusion and coating on the outer surface of the cable core, cool and shape, form the protective sheath coated on the outer surface of the cable core, and obtain the cable; the mixing refers to mixing at 130°C for 10min; the temperature of the extrusion process is 190°C, and the speed of the screw main engine is 80rpm; The mass ratio of the syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 42:4:0.4:0.2:15:1.2:3:2:2:0.8:2; The preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 2h, add cordierite powder, adjust the pH to 7.8, stir ultrasonically for 30min, add silane coupling agent KH-550, stir for 6h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.8:300:1.2:0.12; S2, take the material A and methanol, mix them, ultrasonically stir for 30 minutes, and obtain material B for standby; take 2,4,6-tris (4-aminophenyl) -1,3,5-triazine, 2,5-divinyl-1,4-benzenedical, and acetonitrile, mix them, ultrasonically stir for 40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 12 minutes, stand at room temperature for 40 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60 ° C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris (4-aminophenyl) -1,3,5-triazine, 2,5-divinyl-1,4-benzenedical, acetonitrile, and acetic acid is 0.3g: 50mL: 0.15g: 0.12g: 50mL: 3mL; S3, taking the material C, xylene, and n-butanol, mixing, ultrasonically dispersing for 40 minutes, adding bisphenol A epoxy resin E51, stirring for 40 minutes, and obtaining the modified epoxy resin; the mass ratio of the material C, xylene, n-butanol, and bisphenol A epoxy resin E51 is 1.5:0.7:0.3:15; The preparation method of the modified lignin comprises the following steps: Take lignin and dry it at 105°C to constant weight, then transfer it to a high-speed mixer, add caprolactone, stir for 20 minutes, then transfer it to a forced air drying oven and keep it at 120°C for 4 hours, cool it, crush it, and pass it through a 200-mesh sieve to obtain the modified lignin; the mass ratio of the lignin to caprolactone is 6:1.5.

[0018] Comparative Example 1 The difference from Example 2 is that the preparation of the cable includes the following steps: Isotactic polypropylene (purchased from Shanghai Yingxin Laboratory Equipment Co., Ltd., product number: YXE06032-100g), modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, piperazine phosphate flame retardant are added into a high-speed mixer, mixed, cooled, transferred to a twin-screw extruder for extrusion and coated on the outer surface of the cable core, cooled and shaped to form the protective cover coated on the outer surface of the cable core. The cable is obtained; the mixing refers to mixing at 120°C for 9 minutes; the temperature of the extrusion process is 175°C and the speed of the screw main engine is 70rpm; the mass ratio of the isotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 38:3:0.3:0.15:12:1:2.5:1.5:1.5:0.65:1.5.

[0019] Comparative Example 2 The difference from Example 2 is that no modified lignin is added during the preparation of the cable.

[0020] Comparative Example 3 The difference from Example 2 is that no modified epoxy resin is added during the preparation of the cable.

[0021] Comparative Example 4 The difference from Example 2 is that the lignin is not modified, and the lignin is simply dried at 105° C. to a constant weight, crushed, and passed through a 200-mesh sieve to obtain unmodified lignin.

[0022] Comparative Example 5 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 7.4, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3. Mix the material C, xylene and n-butanol, and disperse them by ultrasonication for 35 minutes. Add bisphenol A epoxy resin E51 and stir for 35 minutes to obtain the modified epoxy resin. The mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0023] Comparative Example 6 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 7.0, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3. Mix the material C, xylene and n-butanol, and disperse them by ultrasonication for 35 minutes. Add bisphenol A epoxy resin E51 and stir for 35 minutes to obtain the modified epoxy resin. The mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0024] Comparative Example 7 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 6, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3. Mix the material C, xylene and n-butanol, and disperse them by ultrasonication for 35 minutes. Add bisphenol A epoxy resin E51 and stir for 35 minutes to obtain the modified epoxy resin. The mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0025] Comparative Example 8 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 7.9, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3. Mix the material C, xylene and n-butanol, and disperse them by ultrasonication for 35 minutes. Add bisphenol A epoxy resin E51 and stir for 35 minutes to obtain the modified epoxy resin. The mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0026] Comparative Example 9 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1, mix agar and glycerol, heat and stir in a 95°C water bath for 1.5h, add cordierite powder, adjust the pH to 8.0, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, mix them, ultrasonically stir for 30-40 minutes, add them to the material B, then add acetic acid, ultrasonically stir for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S3. Mix the material C, xylene and n-butanol, and disperse them by ultrasonication for 35 minutes. Add bisphenol A epoxy resin E51 and stir for 35 minutes to obtain the modified epoxy resin. The mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0027] Comparative Example 10 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix cordierite powder and methanol, stir ultrasonically for 20-30 minutes to obtain material B for standby use; mix 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, and acetonitrile, stir ultrasonically for 30-40 minutes, add to the material B, then add acetic acid, stir ultrasonically for 11 minutes, stand at room temperature for 35 hours, centrifuge, wash the solid phase, dry it, and vacuum dry it at 60°C for 24 hours to obtain material C; the dosage ratio of the cordierite powder, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicaldehyde, acetonitrile, and acetic acid is 0.25g:50mL:0.145g:0.115g:50mL:2.5mL; S2. Mix the material C, xylene and n-butanol, disperse them by ultrasonication for 35 minutes, add bisphenol A epoxy resin E51, and stir for 35 minutes to obtain the modified epoxy resin; the mass ratio of the material C, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0028] Comparative Example 11 The difference from Example 2 is that the preparation method of the modified epoxy resin comprises the following steps: S1. Mix agar and glycerol, heat and stir in a water bath at 95°C for 1.5h, add cordierite powder, adjust the pH to 7.7, stir ultrasonically for 25min, add silane coupling agent KH-550, stir for 5h, filter and separate, take the solid phase and dry to obtain material A; the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.7:250:1.1:0.11; S2. Mix the material A, xylene and n-butanol, perform ultrasonic dispersion for 35 minutes, add bisphenol A epoxy resin E51, and stir for 35 minutes to obtain the modified epoxy resin; the mass ratio of the material A, xylene, n-butanol and bisphenol A epoxy resin E51 is 1.3:0.6:0.25:15.

[0029] Performance Testing The cables prepared in Examples 1-3 and Comparative Examples 1-11 were subjected to performance tests according to the following standards or methods. The test results are shown in Table 1 below.

[0030] Use BK-JF-3 oxygen index tester to test oxygen index; Impact strength test is carried out according to standard GB / T 18743-2022; The vertical burning grade test is carried out according to standard GB / T 10707-2008.

[0031] Table 1 As can be seen from Table 1, the cables prepared in Examples 1-3 of the present application have excellent impact resistance and fire resistance; in Comparative Example 1, isotactic polypropylene is used, which cannot form a cross-linked structure with modified lignin, resulting in reduced impact resistance; in Comparative Example 2, no modified lignin is added, and the present application uses caprolactone to modify lignin, thereby enhancing the interface between lignin and syndiotactic polypropylene and improving impact resistance. At the same time, the modified lignin can also increase the fire resistance of the cable through carbonization; in Comparative Example 3, no modified epoxy resin is added. On the one hand, the cordierite in the modified epoxy resin can increase the impact resistance of the cable, and on the other hand, the piperazine phosphate flame retardant can decompose at a low temperature in the initial stage of combustion to catalyze the degradation of the modified epoxy resin to produce a carbon layer, thereby blocking heat diffusion and protecting the internal structure of the cable from is further damaged; in Comparative Example 4, no modified lignin is added, and a cross-linked structure cannot be formed to alleviate the impact force on the cable, but the unmodified lignin can still be used as a carbonizing agent to assist in forming a barrier carbon layer to achieve a certain fireproofing effect; in Comparative Examples 5-9, the pH value of the cordierite surface treatment process is too high or too low, which will cause the cordierite to a certain extent to agglomerate, affecting its dispersibility, resulting in reduced impact resistance and fireproofing effects; in Comparative Example 10, the surface of the cordierite was not modified, resulting in the subsequent failure to uniformly coat the covalent organic framework on its surface, resulting in reduced impact resistance and fireproofing of the cable; in Comparative Example 11, the covalent organic framework was not coated on the surface of the cordierite, resulting in difficulty for the cordierite to adhere to the surface of the epoxy resin, resulting in reduced impact resistance and fireproofing properties.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an impact-resistant fireproof cable, characterized in that: The cable comprises a cable core and a protective sheath, and the preparation method of the cable comprises the following steps: Add syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant into a high-speed mixer, mix, cool, transfer to a twin-screw extruder for extrusion and coating on the outer surface of the cable core, cool and shape to form the protective sheath coating the outer surface of the cable core, and obtain the cable.

2. The method for preparing an impact-resistant and fire-resistant cable according to claim 1, characterized in that: The mass ratio of the syndiotactic polypropylene, modified lignin, sulfur, di-tert-butyl peroxide isopropylbenzene, modified epoxy resin, 650 epoxy curing agent, talcum powder, antioxidant 168, ultraviolet light absorber UV-360, stearic acid, and piperazine phosphate flame retardant is 35-42: 2-4: 0.2-0.4: 0.1-0.2: 10-15: 0.8-1.2: 2-3: 1-2: 1-2: 0.5-0.8: 1-2.

3. The method for preparing an impact-resistant and fire-resistant cable according to claim 1, characterized in that: The preparation method of the modified epoxy resin comprises the following steps: S1, mix agar and glycerol, heat and stir in a water bath, add cordierite powder, adjust the pH to 7.5-7.8, stir ultrasonically, add silane coupling agent KH-550, stir, filter and separate, take the solid phase and dry to obtain material A; S2, take the material A and methanol, mix them, ultrasonically stir for 20-30 minutes, and obtain material B for standby; take 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicarbaldehyde, and acetonitrile, mix them, ultrasonically stir, add them to the material B, then add acetic acid, ultrasonically stir, stand at room temperature, centrifuge, wash the solid phase, dry, and vacuum dry to obtain material C; S3, taking the material C, xylene and n-butanol, mixing them, dispersing them by ultrasonic, adding bisphenol A epoxy resin E51, stirring, and obtaining the modified epoxy resin.

4. The impact-resistant fireproof cable and the preparation method thereof according to claim 3, characterized in that: In step S1, the mass ratio of agar, glycerol, cordierite powder and silane coupling agent KH-550 is 1.5-1.8:200-300:1-1.2:0.1-0.

12.

5. The method for preparing an impact-resistant and fire-resistant cable according to claim 3, characterized in that: In step S2, the dosage ratio of material A, methanol, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine, 2,5-divinyl-1,4-benzenedicarbaldehyde, acetonitrile and acetic acid is 0.2-0.3 g:50 mL:0.14-0.15 g:0.11-0.12 g:50 mL:2-3 mL.

6. The method for preparing an impact-resistant and fire-resistant cable according to claim 3, characterized in that: In step S3, the mass ratio of the material C, xylene, n-butanol, and bisphenol A epoxy resin E51 is 1-1.5:0.5-0.7:0.2-0.3:

15.

7. The method for preparing an impact-resistant and fire-resistant cable according to claim 1, characterized in that: The preparation method of the modified lignin comprises the following steps: Take lignin and dry it to constant weight, then transfer it to a high-speed mixer, add caprolactone, stir, then transfer it to a forced air drying oven and keep it at 120° C., cool, crush, and sieve to obtain the modified lignin.

8. The method for preparing an impact-resistant and fire-resistant cable according to claim 7, characterized in that: The mass ratio of the lignin to caprolactone is 4-6:1-1.

5.

9. An impact-resistant and fire-resistant cable produced by the production method according to any one of claims 1 to 8.

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