Environment-friendly high-flame-retardant cable material and preparation method thereof

Abstract

This invention discloses an environmentally friendly, high flame-retardant cable material and its preparation method, relating to the field of cable material technology. It comprises the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 10-15 parts benzene ring-containing hyperbranched polyborosilicate, 8-10 parts 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1-3 parts phosphorus pentoxide, 0.5-0.8 parts polyphosphoric acid, 3-5 parts melamine phosphate, 25-35 parts modified filler, 3-5 parts compatibilizer, 0.8-1.5 parts antioxidant, 0.5-0.8 parts lubricant, 4-6 parts plasticizer, and 1-2 parts light stabilizer. This cable material exhibits significant flame retardant effect, excellent mechanical and environmental properties, good aging resistance, and a long service life.

Description

Technical Field

[0001] This invention relates to the field of cable material technology, and in particular to an environmentally friendly, highly flame-retardant cable material and its preparation method. Background Technology

[0002] With the continuous growth of electricity demand in modern society, the safety and environmental protection of cables, as a key carrier of power transmission, are receiving increasing attention. Among the many performance requirements for cables, flame retardancy is crucial, as it effectively prevents the spread of fire and protects lives and property.

[0003] Existing flame-retardant cables primarily achieve their flame-retardant effect by adding flame retardants to the manufacturing materials. Halogenated flame retardants are a common type among many. While these flame retardants offer significant flame-retardant effects, they release large amounts of toxic and harmful gases such as hydrogen halides during combustion. These gases not only severely pollute the environment but also hinder evacuation at fire scenes, increase the difficulty of rescue operations, and pose a significant threat to human health. In this context, halogen-free flame retardants, represented by inorganic hydroxides such as aluminum hydroxide and magnesium hydroxide, have become widely used. These flame retardants are more environmentally friendly, but often require large amounts to achieve the desired flame-retardant effect. This can lead to a decline in the mechanical and processing properties of the cable material, thus affecting the actual performance and service life of the cable. Furthermore, due to compatibility issues, these flame retardants can leak into flame-retardant cables during long-term use, affecting product performance stability and service life. Other types of flame-retardant cables on the market also suffer from various technical defects, including insufficient aging resistance, poor mechanical properties, short service life, and the need for further improvement in flame retardancy and environmental performance.

[0004] To address the aforementioned issues, Chinese invention patent CN102485792B discloses an environmentally friendly flame-retardant cable material, comprising the following components and weight percentages: 40-70 parts thermoplastic elastomer, 10-30 parts PVC resin, 10-14 parts nitrogen / phosphorus composite flame retardant, 0.5-2 parts antioxidant, 2-15 parts plasticizer, 0.2-0.6 parts heat stabilizer, and 2-3 parts reinforcing agent. This invention utilizes a mixture of TPEE and PVC to prepare the cable material. On one hand, it improves the low-temperature flexibility of PVC, increasing tensile strength, elongation, hardness, and tear strength. On the other hand, PVC can improve the flame-retardant properties of the composite material, achieving the desired flame-retardant effect without adding excessive amounts of flame retardant. Moreover, PVC is much cheaper than TPEE, reducing costs. The flame retardant uses a blend of nitrogen and phosphorus-based flame retardants, with the addition of reinforcing agents to improve the mechanical properties of the composite material, making it applicable to mid-to-high-end wire and cable sheathing and optical fiber sheathing applications. However, the PVC base material still contains halogens, and its environmental performance needs further improvement.

[0005] It is evident that there is still a need in this field for an environmentally friendly, highly flame-retardant cable material and its preparation method that exhibits significant flame retardancy, excellent mechanical and environmental performance, good aging resistance, and long service life. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an environmentally friendly high flame-retardant cable material with significant flame retardant effect, excellent mechanical and environmental performance, good aging resistance, and long service life, as well as its preparation method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: an environmentally friendly, high flame-retardant cable material, comprising the following raw materials in parts by weight: 100 parts of thermoplastic polyester elastomer, 10-15 parts of benzene ring hyperbranched polyborosilicate, 8-10 parts of 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1-3 parts of phosphorus pentoxide, 0.5-0.8 parts of polyphosphoric acid, 3-5 parts of melamine phosphate, 25-35 parts of modified filler, 3-5 parts of compatibilizer, 0.8-1.5 parts of antioxidant, 0.5-0.8 parts of lubricant, 4-6 parts of plasticizer, and 1-2 parts of light stabilizer.

[0008] Preferably, the thermoplastic polyester elastomer is... 3078.

[0009] Preferably, there are no special requirements for the source of the benzene ring hyperbranched polyborosilazane. In one embodiment of the present invention, the benzene ring hyperbranched polyborosilazane is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0010] Preferably, the preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added to the solvent. The mixture is stirred and reacted at 60-70°C under an inert gas atmosphere for 3-6 hours. After the reaction is completed, the solvent is removed by rotary evaporation to obtain the modified filler.

[0011] Preferably, the mass ratio of the aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, nano boron fiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is (3-5):1:(0.8-1.2):(20-30):(0.3-0.5):0.5:0.3:(0.3-0.5):0.03.

[0012] Preferably, the nano-titanium dioxide has a particle size of 20-60 nm; the nano-boron fiber has an average diameter of 10-100 nm and an aspect ratio of (25-35):1.

[0013] Preferably, the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is any one of nitrogen, helium, neon, and argon.

[0014] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELOR PO1020 provided by ExxonMobil, USA.

[0015] Preferably, the antioxidant is at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0016] Preferably, the lubricant is at least one of ethylene bis-stearamide and butyl stearate.

[0017] Preferably, the light stabilizer is at least one of hindered amine light stabilizer HS-944 and ultraviolet absorber UV-531.

[0018] Another objective of this invention is to provide a method for preparing the environmentally friendly high flame retardant cable material, comprising the following steps: mixing each raw material evenly according to the weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame retardant cable material.

[0019] Preferably, the extrusion temperature of the twin-screw extruder is 190-205℃.

[0020] Preferably, the screw speed of the twin-screw extruder is 60-120 r / min.

[0021] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0022] (1) The method for preparing environmentally friendly high flame retardant cable material disclosed in this invention is simple in process, convenient in operation and control, has high manufacturing efficiency and finished product qualification rate, low dependence on equipment, suitable for continuous large-scale production, and has high promotion and application value.

[0023] (2) The environmentally friendly high flame-retardant cable material disclosed in this invention is made from the following raw materials in parts by weight: 100 parts of thermoplastic polyester elastomer, 10-15 parts of benzene ring hyperbranched polyborosilicate, 8-10 parts of 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1-3 parts of phosphorus pentoxide, 0.5-0.8 parts of polyphosphoric acid, 3-5 parts of melamine phosphate, 25-35 parts of modified filler, 3-5 parts of compatibilizer, 0.8-1.5 parts of antioxidant, 0.5-0.8 parts of lubricant, 4-6 parts of plasticizer, and 1-2 parts of light stabilizer. Through the synergistic effect of the various raw materials, the resulting cable material exhibits significant flame retardant effect, excellent mechanical and environmental performance, good aging resistance, and long service life. The sulfonic acid group on 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid can chemically react with a benzene-containing substrate under the catalysis of phosphorus oxide and polyphosphoric acid, introducing polar groups such as hydroxyl groups. This effectively improves the compatibility between raw materials, thereby enhancing the mechanical properties and aging resistance of cable materials and extending their service life. Simultaneously, the introduced sulfur element, in combination with other active elements, further improves the flame-retardant effect. The addition of benzene-ring-containing hyperbranched polyborosilicate, in combination with other raw materials, effectively improves the flame-retardant effect; it also improves mechanical properties and aging resistance.

[0024] (3) The environmentally friendly high flame-retardant cable material disclosed in this invention includes modified fillers comprising 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, and diphenyl(4-vinylphenyl)phosphine oxide. The thiazole group, trimethoxysilane, triazine group, and phenylphosphine oxide group introduced at the same time, under the multiple effects of electronic effect, steric hindrance effect and conjugation effect, make the product with more significant flame retardant effect, better mechanical properties and aging resistance. Moreover, the modification can improve the compatibility between the filler and the substrate and the uniformity of the filler dispersion. The filler includes aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide and nano boron fiber. Through the mutual cooperation of these fillers, the cable material has better mechanical properties and more significant flame retardant effect.

[0025] (4) The environmentally friendly high flame retardant cable material disclosed in this invention does not contain halogens or substances that are highly harmful to the environment and human health. It is more environmentally friendly and safer to use. Detailed Implementation

[0026] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0027] Example 1

[0028] An environmentally friendly, highly flame-retardant cable material is made from the following raw materials in parts by weight: 100 parts of thermoplastic polyester elastomer, 10 parts of benzene ring hyperbranched polyborosilicate, 8 parts of 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1 part of phosphorus pentoxide, 0.5 parts of polyphosphoric acid, 3 parts of melamine phosphate, 25 parts of modified filler, 3 parts of compatibilizer, 0.8 parts of antioxidant, 0.5 parts of lubricant, 4 parts of plasticizer, and 1 part of light stabilizer.

[0029] The thermoplastic polyester elastomer is 3078; The benzene ring-containing hyperbranched polyborosilicate is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0030] The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 60°C for 3 hours under an inert gas atmosphere. After the reaction, the solvent is removed by rotary evaporation to obtain the modified filler. The aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are... The mass ratio of boron nanofiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is 3:1:0.8:20:0.3:0.5:0.3:0.3:0.03; the particle size of the nano-titanium dioxide is 20 nm; the average diameter of the nano-boron fiber is 10 nm, and the aspect ratio is 25:1; the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is nitrogen.

[0031] The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELORPO1020 provided by ExxonMobil, USA; the antioxidant is antioxidant 168; the lubricant is ethylene bis-stearamide; and the light stabilizer is hindered amine light stabilizer HS-944.

[0032] A method for preparing the aforementioned environmentally friendly high flame-retardant cable material includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame-retardant cable material; the extrusion temperature of the twin-screw extruder is 190℃; and the screw speed of the twin-screw extruder is 60r / min.

[0033] Example 2

[0034] An environmentally friendly, highly flame-retardant cable material is made from the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 12 parts benzene ring hyperbranched polyborosilicate, 8.5 parts 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1.5 parts phosphorus pentoxide, 0.6 parts polyphosphoric acid, 3.5 parts melamine phosphate, 27 parts modified filler, 3.5 parts compatibilizer, 1 part antioxidant, 0.6 parts lubricant, 4.5 parts plasticizer, and 1.2 parts light stabilizer.

[0035] The thermoplastic polyester elastomer is 3078; The benzene ring-containing hyperbranched polyborosilicate is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0036] The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano-titanium dioxide, and nano-boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 63°C for 4 hours under an inert gas atmosphere. After the reaction is complete, the solvent is removed by rotary evaporation to obtain the modified filler. The aluminum hydroxide flame retardant VK-LA50, nano-titanium dioxide, and nano-boron fibers... The mass ratio of fiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is 3.5:1:0.9:23:0.35:0.5:0.3:0.35:0.03; the particle size of the nano-titanium dioxide is 30 nm; the average diameter of the nano-boron fiber is 30 nm, and the aspect ratio is 27:1; the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is helium.

[0037] The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELORPO1020 provided by ExxonMobil, USA; the antioxidant is antioxidant 1010; the lubricant is butyl stearate; and the light stabilizer is ultraviolet absorber UV-531.

[0038] A method for preparing the aforementioned environmentally friendly high flame-retardant cable material includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame-retardant cable material; the extrusion temperature of the twin-screw extruder is 195℃; and the screw speed of the twin-screw extruder is 80r / min.

[0039] Example 3

[0040] An environmentally friendly, highly flame-retardant cable material is made from the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 13 parts benzene ring hyperbranched polyborosilicate, 9 parts 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 2 parts phosphorus pentoxide, 0.65 parts polyphosphoric acid, 4 parts melamine phosphate, 30 parts modified filler, 4 parts compatibilizer, 1.2 parts antioxidant, 0.65 parts lubricant, 5 parts plasticizer, and 1.5 parts light stabilizer.

[0041] The thermoplastic polyester elastomer is 3078; The benzene ring-containing hyperbranched polyborosilicate is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0042] The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano-titanium dioxide, and nano-boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 65°C for 4.5 hours under an inert gas atmosphere. After the reaction is complete, the solvent is removed by rotary evaporation to obtain the modified filler. The aluminum hydroxide flame retardant VK-LA50 and nano-titanium dioxide... The mass ratio of boron nanofibers, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is 4:1:1:25:0.4:0.5:0.3:0.4:0.03; the particle size of the nano-titanium dioxide is 40 nm; the average diameter of the nano-boron fibers is 50 nm, and the aspect ratio is 30:1; the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is neon.

[0043] The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELORPO1020 provided by ExxonMobil, USA; the antioxidant is antioxidant 1076; the lubricant is ethylene bis-stearamide; and the light stabilizer is hindered amine light stabilizer HS-944.

[0044] A method for preparing the environmentally friendly high flame-retardant cable material includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame-retardant cable material; the extrusion temperature of the twin-screw extruder is 200℃; and the screw speed of the twin-screw extruder is 90 r / min.

[0045] Example 4

[0046] An environmentally friendly, highly flame-retardant cable material is made from the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 14 parts benzene ring hyperbranched polyborosilicate, 9.5 parts 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 2.5 parts phosphorus pentoxide, 0.75 parts polyphosphoric acid, 4.5 parts melamine phosphate, 33 parts modified filler, 4.5 parts compatibilizer, 1.3 parts antioxidant, 0.75 parts lubricant, 5.5 parts plasticizer, and 1.8 parts light stabilizer.

[0047] The thermoplastic polyester elastomer is 3078; The benzene ring-containing hyperbranched polyborosilicate is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0048] The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 68°C for 5.5 hours under an inert gas atmosphere. After the reaction is complete, the solvent is removed by rotary evaporation to obtain the modified filler. The aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano... The mass ratio of boron fiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is 4.5:1:1.1:28:0.45:0.5:0.3:0.45:0.03; the particle size of the nano-titanium dioxide is 50 nm; the average diameter of the nano-boron fiber is 90 nm, and the aspect ratio is 33:1; the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is argon.

[0049] The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELORPO1020 provided by ExxonMobil, USA; the antioxidant is a mixture of antioxidant 168, antioxidant 1010, and antioxidant 1076 in a mass ratio of 1:2:3; the lubricant is a mixture of ethylene bis-stearamide and butyl stearate in a mass ratio of 3:5; the light stabilizer is a mixture of hindered amine light stabilizer HS-944 and ultraviolet absorber UV-531 in a mass ratio of 1:3.

[0050] A method for preparing the environmentally friendly high flame-retardant cable material includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame-retardant cable material; the extrusion temperature of the twin-screw extruder is 203℃; and the screw speed of the twin-screw extruder is 110 r / min.

[0051] Example 5

[0052] An environmentally friendly, highly flame-retardant cable material is made from the following raw materials in parts by weight: 100 parts of thermoplastic polyester elastomer, 15 parts of benzene ring hyperbranched polyborosilicate, 10 parts of 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 3 parts of phosphorus pentoxide, 0.8 parts of polyphosphoric acid, 5 parts of melamine phosphate, 35 parts of modified filler, 5 parts of compatibilizer, 1.5 parts of antioxidant, 0.8 parts of lubricant, 6 parts of plasticizer, and 2 parts of light stabilizer.

[0053] The thermoplastic polyester elastomer is 3078; The benzene ring-containing hyperbranched polyborosilicate is prepared according to the method of Example 1 of Chinese Invention Patent Application Publication No. CN109251038A.

[0054] The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 70°C for 6 hours under an inert gas atmosphere. After the reaction is complete, the solvent is removed by rotary evaporation to obtain the modified filler. The aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, and nano boron fibers are... The mass ratio of boron nanofiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator is 5:1:1.2:30:0.5:0.5:0.3:0.5:0.03; the particle size of the nano-titanium dioxide is 60 nm; the average diameter of the nano-boron fiber is 100 nm, and the aspect ratio is 35:1; the organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is nitrogen.

[0055] The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELORPO1020 provided by ExxonMobil, USA; the antioxidant is antioxidant 168; the lubricant is ethylene bis-stearamide; and the light stabilizer is hindered amine light stabilizer HS-944.

[0056] A method for preparing the environmentally friendly high flame-retardant cable material includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and then granulating to obtain the environmentally friendly high flame-retardant cable material; the extrusion temperature of the twin-screw extruder is 205℃; and the screw speed of the twin-screw extruder is 120r / min.

[0057] Comparative Example 1

[0058] An environmentally friendly, highly flame-retardant cable material and its preparation method are basically the same as in Example 1, except that a thermoplastic polyester elastomer is used instead of benzene ring hyperbranched polyborosilicate.

[0059] Comparative Example 2

[0060] An environmentally friendly, highly flame-retardant cable material and its preparation method are basically the same as in Example 1, except that 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid and 4-methyl-5-vinylthiazole are not added.

[0061] To further illustrate the beneficial technical effects of the environmentally friendly high flame-retardant cable materials involved in the various embodiments of the present invention, relevant performance tests were conducted on the environmentally friendly high flame-retardant cable materials involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1.

[0062] (1) Tensile strength: The tensile strength was tested according to the method of ASTM D412.

[0063] (2) Aging resistance: The test was conducted according to GB / T16422.2-2014 "Laboratory Light Source Exposure Test Method for Plastics - Part 2: Xenon Arc Lamp". The cable material sample was placed in a xenon arc lamp aging test chamber to simulate the light, temperature, humidity and other conditions in the natural environment. After aging for 1000 hours, it was cooled to room temperature and the tensile strength was measured again according to the method in (1). The tensile strength retention rate was statistically analyzed and calculated. The higher the value, the better the aging resistance.

[0064] (3) Oxygen index test: The test shall be conducted in accordance with GB / T 2406.2-2009.

[0065] Table 1 Performance Test Results of Environmentally Friendly High Flame Retardant Cable Material

[0066]

[0067] As shown in Table 1, the environmentally friendly high flame-retardant cable material of the present invention exhibits better mechanical properties, flame-retardant properties, and aging resistance than the comparative product. The combined use of benzene ring hyperbranched polyborosilazane, 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, and 4-methyl-5-vinylthiazole is beneficial for improving the above properties.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An environmentally friendly, highly flame-retardant cable material, characterized in that, It is made from the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 10-15 parts benzene ring hyperbranched polyborosilicate, 8-10 parts 3-trimethylolmethylamine-2-hydroxypropanesulfonic acid, 1-3 parts phosphorus pentoxide, 0.5-0.8 parts polyphosphoric acid, 3-5 parts melamine phosphate, 25-35 parts modified filler, 3-5 parts compatibilizer, 0.8-1.5 parts antioxidant, 0.5-0.8 parts lubricant, 4-6 parts plasticizer, and 1-2 parts light stabilizer; The preparation method of the modified filler includes the following steps: aluminum hydroxide flame retardant VK-LA50, nano-titanium dioxide, and nano-boron fibers are mixed evenly and dispersed in an organic solvent. Then, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and an initiator are added. The mixture is stirred and reacted at 60-70°C under an inert gas atmosphere for 3-6 hours. After the reaction is complete, the solvent is removed by rotary evaporation. The modified filler was obtained; the mass ratio of the aluminum hydroxide flame retardant VK-LA50, nano titanium dioxide, nano boron fiber, organic solvent, 4-methyl-5-vinylthiazole, vinyltrimethoxysilane, 1,3,5-triacryloylhexahydro-1,3,5-triazine, diphenyl(4-vinylphenyl)phosphine oxide, and initiator was (3-5):1:(0.8-1.2):(20-30):(0.3-0.5):0.5:0.3:(0.3-0.5):0.

03.

2. The environmentally friendly high flame-retardant cable material according to claim 1, characterized in that, The thermoplastic polyester elastomer is Hytrel® 3078.

3. The environmentally friendly high flame-retardant cable material according to claim 1, characterized in that, The nano-titanium dioxide has a particle size of 20-60 nm; the nano-boron fiber has an average diameter of 10-100 nm and an aspect ratio of (25-35):

1.

4. The environmentally friendly high flame-retardant cable material according to claim 1, characterized in that, The organic solvent is N,N-dimethylformamide; the initiator is azobisisobutyronitrile; and the inert gas is any one of nitrogen, helium, neon, and argon.

5. The environmentally friendly high flame-retardant cable material according to claim 1, characterized in that, The compatibilizer is maleic anhydride-grafted polypropylene, selected from MAH-g-PP with the brand name EXXELOR PO1020 provided by ExxonMobil, USA; the antioxidant is at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

6. The environmentally friendly high flame-retardant cable material according to claim 1, characterized in that, The lubricant is at least one of ethylene bis-stearamide and butyl stearate; the light stabilizer is at least one of hindered amine light stabilizer HS-944 and ultraviolet absorber UV-531.

7. A method for preparing an environmentally friendly high flame-retardant cable material according to any one of claims 1-6, characterized in that, The process includes the following steps: mixing the raw materials evenly according to their weight proportions to obtain a mixture, then adding the mixture to a twin-screw extruder for co-extrusion, and finally granulating to obtain an environmentally friendly, high flame-retardant cable material.

8. The method for preparing the environmentally friendly high flame-retardant cable material according to claim 7, characterized in that, The extrusion temperature of the twin-screw extruder is 190-205℃; the screw speed of the twin-screw extruder is 60-120 r / min.

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