Anti-piercing and anti-corrosion fireproof cable sheath material and preparation method thereof

Abstract

The invention relates to the field of high polymer materials, in particular to an anti-puncture and anti-corrosion fireproof cable sheath material and a preparation method thereof, which are used for solving the problem that the application of an existing cable sheath material in the high-end field is limited due to poor anti-puncture performance, anti-corrosion performance and fireproof performance of the existing cable sheath material. According to the sheath material, polypropylene resin and polyvinyl chloride resin are taken as main raw materials, phytic acid grafted whiskers are added into the main raw materials, so that a three-dimensional network structure can be formed in a matrix, crack propagation is effectively hindered, the mechanical property and the anti-puncture effect of the sheath material are remarkably improved, and meanwhile, the flame retardance of the sheath material can be remarkably improved; the polyfluorophenyl triazine compound is added into the sheath material, so that a hydrophobic layer can be formed on the surface of a matrix, the corrosion resistance of the sheath material is remarkably improved, meanwhile, the flame retardance of the sheath material is further improved, and therefore, the sheath material has excellent puncture resistance, corrosion resistance and flame retardance.

Description

Technical Field

[0001] This invention relates to the field of polymer materials, specifically to a puncture-resistant and corrosion-resistant fire-resistant cable sheath material and its preparation method. Background Technology

[0002] With the development of industries such as power and communications, the safety performance requirements for cables are becoming increasingly stringent. As the first line of defense protecting the internal conductors, cable sheaths need to possess multiple protective functions. Traditional cable sheath materials mostly use single or blended resins such as polyvinyl chloride, polyethylene, or polypropylene. While these materials possess a certain level of mechanical strength and corrosion resistance, they are significantly insufficient in terms of fire resistance and puncture resistance, limiting their application in high-end fields.

[0003] Therefore, developing a cable sheath material that combines excellent puncture resistance, corrosion resistance, and fire resistance has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a puncture-resistant and corrosion-resistant fireproof cable sheath material and its preparation method, which solves the problem that the existing cable sheath materials have poor puncture resistance, corrosion resistance and fire resistance, which limits their application in high-end fields.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, this application provides a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following components in parts by weight: The composition includes 80-90 parts of polypropylene resin, 25-35 parts of polyvinyl chloride resin, 3-15 parts of phytic acid grafted whiskers, 1-7 parts of polyfluorophenyl triazine compound, 0.8-1.6 parts of lubricant, 8-12 parts of plasticizer, 0.5-0.7 parts of antioxidant, and 0.3-0.5 parts of light stabilizer. The phytic acid-grafted whiskers are prepared by the following steps: Step a1: Add coupling agent, methanol and deionized water to a three-necked flask equipped with a stirrer, thermometer and reflux condenser. Stir the reaction at 20-25℃ and 200-300 r / min for 10-15 min. Then add whiskers and continue stirring under reflux for 4-6 h. After the reaction is complete, cool the reaction product to room temperature, then centrifuge. Wash the precipitate 3-5 times with distilled water and then place it in a vacuum drying oven at 70-75℃ for 2-4 h to obtain epoxy-grafted whiskers. Step a2: Add epoxy-grafted whiskers and phytic acid solution to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 20-25℃ and 200-300 r / min for 10-15 min. Then, raise the temperature to 60-65℃ and continue stirring for 1-3 h. After the reaction is complete, cool the reaction product to room temperature, then centrifuge. Wash the precipitate 3-5 times with distilled water, then place it in a vacuum drying oven and dry it at 60-65℃ for 1-3 h to obtain phytic acid-grafted whiskers.

[0006] In a preferred embodiment of the present invention, the ratio of coupling agent, methanol, deionized water and whiskers in step a1 is 15-20 mL: 1-5 g: 3-5 mL: 3 g.

[0007] In a preferred embodiment of the present invention, the coupling agent in step a1 is silane coupling agent KH-560; the whiskers are NP-YW2 basic magnesium sulfate whiskers.

[0008] In a preferred embodiment of the present invention, the ratio of epoxy-grafted whiskers to phytic acid solution in step a2 is 5g:30-40mL.

[0009] In a preferred embodiment of the present invention, the phytic acid solution in step a2 has a mass fraction of 30-50%.

[0010] In a preferred embodiment of the present invention, the polyfluorophenyl triazine compound is prepared by the following steps: Step b1: Add 3,5-bis(trifluoromethyl)benzoic acid and 1,2-dichloroethane to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and constant pressure dropping funnel. Purge with nitrogen for protection and stir the reaction at 25-30℃ and 200-300 r / min for 20-30 min. Then, raise the temperature to 80-85℃ and add thionyl chloride dropwise while stirring, controlling the dropping rate to 1-3 drops / s. After the addition is complete, continue stirring the reaction for 3-5 h. After the reaction is complete, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain acyl chloride polyfluorinated compound. Step b2: Add the acyl chloride polyfluorine compound, melamine, triethylamine, and N,N-dimethylformamide to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir the reaction at 0-5℃ and 200-300 r / min for 20-30 min. Then raise the temperature to 50-55℃ and continue stirring for 3-5 h. After that, raise the temperature to 90-95℃ and continue stirring for 6-8 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate to obtain the polyfluorophenyl triazine compound.

[0011] In a preferred embodiment of the present invention, the ratio of 3,5-bis(trifluoromethyl)benzoic acid, 1,2-dichloroethane and thionyl chloride in step b1 is 10 mmol: 20-25 mL: 30-35 mmol.

[0012] In a preferred embodiment of the present invention, the ratio of the acyl chloride polyfluorine compound, melamine, triethylamine and N,N-dimethylformamide used in step b2 is 30 mmol: 10 mmol: 40-50 mmol: 60-70 mL.

[0013] Secondly, this application provides a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, used to prepare the puncture-resistant and corrosion-resistant fire-resistant cable sheath material described in the first aspect, comprising the following steps: Step 1: Weigh out 80-90 parts by weight of polypropylene resin, 25-35 parts by weight of polyvinyl chloride resin, 3-15 parts by weight of phytic acid grafted whiskers, 1-7 parts by weight of polyfluorophenyl triazine compound, 0.8-1.6 parts by weight of lubricant, 8-12 parts by weight of plasticizer, 0.5-0.7 parts by weight of antioxidant and 0.3-0.5 parts by weight of light stabilizer, and set aside. Step 2: Polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer are added to a twin-screw extruder and melt-extruded at a temperature of 180-200℃ and a screw speed of 60-80 r / min. After water cooling and granulation, a puncture-resistant and corrosion-resistant fireproof cable sheath material is obtained.

[0014] In a preferred embodiment of the present invention, the polypropylene resin is PP E02ES.

[0015] In a preferred embodiment of the present invention, the polyvinyl chloride resin is PVC LS300.

[0016] In a preferred embodiment of the present invention, the lubricant is calcium stearate.

[0017] In a preferred embodiment of the present invention, the plasticizer is di-n-octyl adipate.

[0018] In a preferred embodiment of the present invention, the antioxidant is composed of antioxidant 1010 and antioxidant 168 mixed in equal mass ratio.

[0019] In a preferred embodiment of the present invention, the light stabilizer is light stabilizer 770.

[0020] The beneficial effects of this invention are: This invention discloses a puncture-resistant and corrosion-resistant fire-resistant cable sheath material and its preparation method. The method involves melt-extruding polypropylene resin, polyvinyl chloride resin, phytic acid-grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant, and light stabilizer, followed by water cooling and granulation to obtain the puncture-resistant and corrosion-resistant fire-resistant cable sheath material. This sheath material uses polypropylene resin and polyvinyl chloride resin as main raw materials. The addition of phytic acid-grafted whiskers forms a three-dimensional network structure in the matrix, effectively hindering crack propagation and significantly improving the mechanical properties and puncture resistance of the sheath material. It also significantly enhances its flame-retardant properties. The addition of polyfluorophenyl triazine compound forms a hydrophobic layer on the matrix surface, significantly improving the corrosion resistance of the sheath material and further enhancing its flame-retardant properties. Therefore, this sheath material can maintain good performance under harsh environmental conditions, providing excellent puncture resistance, corrosion resistance, and flame-retardant properties. It not only meets the physical protection requirements of cables during use but also effectively improves the overall reliability of the circuit system.

[0021] In the preparation of the sheath material, phytic acid-grafted whiskers were first prepared. Basic magnesium sulfate whiskers were treated with a silane coupling agent, KH-560. The siloxane on the silane coupling agent KH-560 hydrolyzed to form silanols, which could be grafted onto the surface of the basic magnesium sulfate whiskers. Simultaneously, a large number of epoxy groups were introduced, resulting in epoxy-grafted whiskers. Then, phytic acid was used to treat the epoxy-grafted whiskers, and the phosphate groups reacted with the epoxy groups, thereby introducing the phytic acid structure onto the surface of the basic magnesium sulfate whiskers, resulting in phytic acid-grafted whiskers. Basic magnesium sulfate whiskers not only possess the excellent mechanical properties unique to whisker materials, significantly improving the mechanical properties of the sheath material, but also, during their endothermic decomposition, the water of crystallization in the molecules is released as water vapor, generating high-temperature resistant magnesium oxide, giving it excellent flame-retardant properties. After modification, it can be uniformly dispersed in the sheath material. A large amount of phosphorus element was also introduced, which, upon thermal decomposition, forms a dehydration catalyst, promoting the carbonization of organic matter to form a carbon-rich layer, further enhancing its flame-retardant effect.

[0022] In the process of preparing the sheath material, a polyfluorophenyl triazine compound was also prepared. 3,5-bis(trifluoromethyl)benzoic acid was treated with thionyl chloride, and the carboxyl group on 3,5-bis(trifluoromethyl)benzoic acid was converted into an acyl chloride group to obtain an acyl chloride polyfluoro compound. Then, the acyl chloride polyfluoro compound reacted with melamine, and the acyl chloride group on the acyl chloride polyfluoro compound reacted with the amino group on the melamine to obtain the polyfluorophenyl triazine compound. The molecular structure of this polyfluorophenyl triazine compound contains a large number of fluorine atoms and a cyclic structure, which has excellent stability, thus giving it excellent anti-corrosion and high-temperature resistance properties. Moreover, the triazine ring can decompose upon heating to form non-flammable gases such as ammonia and nitrogen, thereby diluting the flammable gas and achieving a flame-retardant effect. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0024] This embodiment describes a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Add 15 mL of silane coupling agent KH-560, 1 g of methanol and 3 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer and reflux condenser. Stir the reaction at 20 °C and 200 r / min for 10 min. Then add 3 g of NP-YW2 basic magnesium sulfate whiskers and continue stirring under reflux for 4 h. After the reaction is complete, cool the reaction product to room temperature, then centrifuge. Wash the precipitate three times with distilled water and then place it in a vacuum drying oven at 70 °C for 2 h to obtain epoxy-grafted whiskers. Step A2: Add 5g of epoxy-grafted whiskers and 30mL of 30% phytic acid solution to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 20℃ and 200r / min for 10min. Then, raise the temperature to 60℃ and continue stirring for 1h. After the reaction is complete, cool the reaction product to room temperature, centrifuge, wash the precipitate three times with distilled water, and then place it in a vacuum drying oven and dry it at 60℃ for 1h to obtain phytic acid-grafted whiskers. Step A3: 10 mmol of 3,5-bis(trifluoromethyl)benzoic acid and 20 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and constant pressure dropping funnel. Nitrogen gas was introduced for protection, and the reaction was stirred at 25 °C and 200 r / min for 20 min. Then, the temperature was raised to 80 °C and 30 mmol of thionyl chloride was added dropwise while stirring, with the dropping rate controlled at 1 drop / s. After the addition was completed, the reaction was stirred for 3 h. After the reaction was completed, the reaction product was cooled to room temperature and then the solvent was removed by rotary evaporation to obtain the acyl chloride polyfluorine compound. Step A4: Add 30 mmol of acyl chloride polyfluorine compound, 10 mmol of melamine, 40 mmol of triethylamine and 60 mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 0°C and 200 r / min for 20 min. Then raise the temperature to 50°C and continue stirring for 3 h. Then raise the temperature to 90°C and continue stirring for 6 h. After the reaction is completed, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate to obtain polyfluorophenyl triazine compound. Step A5: Weigh out 80 parts by weight of polypropylene resin, 25 parts by weight of polyvinyl chloride resin, 3 parts by weight of phytic acid-grafted whiskers, 1 part by weight of polyfluorophenyl triazine compound, 0.8 parts by weight of lubricant, 8 parts by weight of plasticizer, 0.5 parts by weight of antioxidant, and 0.3 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A6: Add polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer into a twin-screw extruder, melt extrude at a temperature of 180℃ and a screw speed of 60r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material. Example 2:

[0025] This embodiment describes a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Add 18 mL of silane coupling agent KH-560, 3 g of methanol, and 4 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and reflux condenser. Stir the reaction at 22 °C and 250 r / min for 12 min. Then add 3 g of NP-YW2 basic magnesium sulfate whiskers and continue stirring under reflux for 5 h. After the reaction is complete, cool the reaction product to room temperature, centrifuge, wash the precipitate 4 times with distilled water, and then place it in a vacuum drying oven and dry it at 72 °C for 3 h to obtain epoxy-grafted whiskers. Step A2: Add 5g of epoxy-grafted whiskers and 35mL of 40% phytic acid solution to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 22℃ and 250r / min for 12min. Then, raise the temperature to 62℃ and continue stirring for 2h. After the reaction is complete, cool the reaction product to room temperature, centrifuge, wash the precipitate four times with distilled water, and then place it in a vacuum drying oven and dry it at 62℃ for 2h to obtain phytic acid-grafted whiskers. Step A3: 10 mmol of 3,5-bis(trifluoromethyl)benzoic acid and 22 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and constant pressure dropping funnel. Nitrogen gas was introduced for protection. The mixture was stirred for 25 min at 28 °C and a stirring rate of 250 r / min. Then, the temperature was raised to 82 °C and 32 mmol of thionyl chloride was added dropwise while stirring, with the dropping rate controlled at 2 drops / s. After the addition was completed, the mixture was stirred for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and then the solvent was removed by rotary evaporation to obtain the acyl chloride polyfluorine compound. Step A4: 30 mmol of acyl chloride polyfluorine compound, 10 mmol of melamine, 45 mmol of triethylamine and 65 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 3°C ​​and 250 r / min for 25 min. Then the temperature was raised to 52°C and the mixture was stirred for 4 h. After that, the temperature was raised to 92°C and the mixture was stirred for 7 h. After the reaction was completed, the reaction product was cooled to room temperature and then filtered under vacuum. The solvent was removed by rotary evaporation of the filtrate to obtain polyfluorophenyl triazine compound. Step A5: Weigh out 85 parts by weight of polypropylene resin, 30 parts by weight of polyvinyl chloride resin, 9 parts by weight of phytic acid-grafted whiskers, 4 parts by weight of polyfluorophenyl triazine compound, 1.2 parts by weight of lubricant, 10 parts by weight of plasticizer, 0.6 parts by weight of antioxidant, and 0.4 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A6: Add polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer into a twin-screw extruder, melt extrude at a temperature of 190℃ and a screw speed of 70r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material. Example 3:

[0026] This embodiment describes a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Add 20 mL of silane coupling agent KH-560, 5 g of methanol and 5 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer and reflux condenser. Stir the reaction at 25 °C and 300 r / min for 15 min. Then add 3 g of NP-YW2 basic magnesium sulfate whiskers and continue stirring under reflux for 6 h. After the reaction is complete, cool the reaction product to room temperature, then centrifuge. Wash the precipitate 5 times with distilled water and then place it in a vacuum drying oven at 75 °C for 4 h to obtain epoxy-grafted whiskers. Step A2: Add 5g of epoxy-grafted whiskers and 40mL of 50% phytic acid solution to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 25℃ and 300r / min for 15min. Then, raise the temperature to 65℃ and continue stirring for 3h. After the reaction is complete, cool the reaction product to room temperature, centrifuge, wash the precipitate 5 times with distilled water, and then place it in a vacuum drying oven and dry it at 65℃ for 3h to obtain phytic acid-grafted whiskers. Step A3: 10 mmol of 3,5-bis(trifluoromethyl)benzoic acid and 25 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and constant pressure dropping funnel. Nitrogen gas was introduced for protection. The mixture was stirred at 30 °C and 300 r / min for 30 min. Then, the temperature was raised to 85 °C and 35 mmol of thionyl chloride was added dropwise while stirring, with the dropping rate controlled at 3 drops / s. After the addition was completed, the mixture was stirred for 5 h. After the reaction was completed, the reaction product was cooled to room temperature and then the solvent was removed by rotary evaporation to obtain the acyl chloride polyfluorine compound. Step A4: Add 30 mmol of acyl chloride polyfluorine compound, 10 mmol of melamine, 50 mmol of triethylamine and 70 mL of N,N-dimethylformamide to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 5°C and 300 r / min for 30 min. Then raise the temperature to 55°C and continue stirring for 5 h. Then raise the temperature to 95°C and continue stirring for 8 h. After the reaction is completed, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate to obtain polyfluorophenyl triazine compound. Step A5: Weigh out 90 parts by weight of polypropylene resin, 35 parts by weight of polyvinyl chloride resin, 15 parts by weight of phytic acid-grafted whiskers, 7 parts by weight of polyfluorophenyl triazine compound, 1.6 parts by weight of lubricant, 12 parts by weight of plasticizer, 0.7 parts by weight of antioxidant, and 0.5 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A6: Add polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer into a twin-screw extruder, melt extrude at a temperature of 200℃ and a screw speed of 80r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material.

[0027] Comparative Example 1: This comparative example illustrates a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Weigh out 90 parts by weight of polypropylene resin, 35 parts by weight of polyvinyl chloride resin, 1.6 parts by weight of lubricant, 12 parts by weight of plasticizer, 0.7 parts by weight of antioxidant, and 0.5 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A2: Add polypropylene resin, polyvinyl chloride resin, lubricant, plasticizer, antioxidant and light stabilizer into a twin-screw extruder, melt extrude at a temperature of 200℃ and a screw speed of 80r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material.

[0028] Comparative Example 2: This comparative example illustrates a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Add 20 mL of silane coupling agent KH-560, 5 g of methanol and 5 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer and reflux condenser. Stir the reaction at 25 °C and 300 r / min for 15 min. Then add 3 g of NP-YW2 basic magnesium sulfate whiskers and continue stirring under reflux for 6 h. After the reaction is complete, cool the reaction product to room temperature, then centrifuge. Wash the precipitate 5 times with distilled water and then place it in a vacuum drying oven at 75 °C for 4 h to obtain epoxy-grafted whiskers. Step A2: Add 5g of epoxy-grafted whiskers and 40mL of 50% phytic acid solution to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 25℃ and 300r / min for 15min. Then, raise the temperature to 65℃ and continue stirring for 3h. After the reaction is complete, cool the reaction product to room temperature, centrifuge, wash the precipitate 5 times with distilled water, and then place it in a vacuum drying oven and dry it at 65℃ for 3h to obtain phytic acid-grafted whiskers. Step A3: Weigh out 90 parts by weight of polypropylene resin, 35 parts by weight of polyvinyl chloride resin, 15 parts by weight of phytic acid-grafted whiskers, 1.6 parts by weight of lubricant, 12 parts by weight of plasticizer, 0.7 parts by weight of antioxidant, and 0.5 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A4: Add polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, lubricant, plasticizer, antioxidant and light stabilizer to a twin-screw extruder, melt extrude at a temperature of 200℃ and a screw speed of 80r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material.

[0029] Comparative Example 3: This comparative example illustrates a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: 10 mmol of 3,5-bis(trifluoromethyl)benzoic acid and 25 mL of 1,2-dichloroethane were added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and constant pressure dropping funnel. Nitrogen gas was introduced for protection. The mixture was stirred at 30 °C and 300 r / min for 30 min. Then, the temperature was raised to 85 °C and 35 mmol of thionyl chloride was added dropwise while stirring, with the dropping rate controlled at 3 drops / s. After the addition was completed, the mixture was stirred for 5 h. After the reaction was completed, the reaction product was cooled to room temperature and then the solvent was removed by rotary evaporation to obtain the acyl chloride polyfluoride compound. Step A2: 30 mmol of acyl chloride polyfluorine compound, 10 mmol of melamine, 50 mmol of triethylamine and 70 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 5 °C and 300 r / min for 30 min. Then the temperature was raised to 55 °C and the mixture was stirred for 5 h. After that, the temperature was raised to 95 °C and the mixture was stirred for 8 h. After the reaction was completed, the reaction product was cooled to room temperature and then filtered under vacuum. The solvent was removed by rotary evaporation of the filtrate to obtain polyfluorophenyl triazine compound. Step A3: Weigh out 90 parts by weight of polypropylene resin, 35 parts by weight of polyvinyl chloride resin, 7 parts by weight of polyfluorophenyl triazine compound, 1.6 parts by weight of lubricant, 12 parts by weight of plasticizer, 0.7 parts by weight of antioxidant, and 0.5 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A4: Add polypropylene resin, polyvinyl chloride resin, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer into a twin-screw extruder, melt extrude at a temperature of 200℃ and a screw speed of 80r / min, and after water cooling and granulation, obtain a puncture-resistant and corrosion-resistant fireproof cable sheath material.

[0030] Comparative Example 4: This comparative example illustrates a method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, comprising the following steps: Step A1: Weigh out 90 parts by weight of polypropylene resin, 35 parts by weight of polyvinyl chloride resin, 15 parts by weight of NP-YW2 basic magnesium sulfate whiskers, 7 parts by weight of melamine, 1.6 parts by weight of lubricant, 12 parts by weight of plasticizer, 0.7 parts by weight of antioxidant, and 0.5 parts by weight of light stabilizer, and set aside. The polypropylene resin is PP E02ES; the polyvinyl chloride resin is PVC LS300; the lubricant is calcium stearate; the plasticizer is di-n-octyl adipate; the antioxidant is antioxidant 1010 and antioxidant 168 mixed in equal mass ratio; and the light stabilizer is light stabilizer 770. Step A2: Polypropylene resin, polyvinyl chloride resin, NP-YW2 basic magnesium sulfate whiskers, melamine, lubricant, plasticizer, antioxidant and light stabilizer are added to a twin-screw extruder and melt-extruded at a temperature of 200℃ and a screw speed of 80r / min. After water cooling and granulation, a puncture-resistant and corrosion-resistant fireproof cable sheath material is obtained.

[0031] Performance testing The puncture-resistant and corrosion-resistant fire-resistant cable sheath materials of Examples 1-3 and Comparative Examples 1-4 were tested for tensile strength according to GB / T1040-2006. After immersion in a 10% sulfuric acid solution for 10 days, the tensile strength retention rate was tested (tensile strength retention rate = tensile strength of the sample immersed in sulfuric acid solution / tensile strength of the sample not immersed in sulfuric acid solution * 100%). The limiting oxygen index was tested according to GB / T 2406.2-2009, and the vertical burning flame retardancy rating was tested according to GB / T 2408-2008. The test results are shown in the table below:

[0032] Referring to the data in the table above, and based on the comparison between Examples 1-3 and Comparative Examples 1-4, it can be seen that the addition of phytic acid-grafted whiskers and polyfluorophenyl triazine compounds can significantly improve the mechanical properties, mechanical property retention rate, and flame retardant properties of the sheath material, indicating that it has a significant enhancing effect on the puncture resistance, corrosion resistance, and fire resistance of the sheath material.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A puncture-resistant and corrosion-resistant sheath material for fire-resistant cables, characterized in that, Includes the following components by weight: The composition includes 80-90 parts of polypropylene resin, 25-35 parts of polyvinyl chloride resin, 3-15 parts of phytic acid grafted whiskers, 1-7 parts of polyfluorophenyl triazine compound, 0.8-1.6 parts of lubricant, 8-12 parts of plasticizer, 0.5-0.7 parts of antioxidant, and 0.3-0.5 parts of light stabilizer. The phytic acid-grafted whiskers are prepared by the following steps: Step a1: The coupling agent, methanol and deionized water are stirred and reacted. Then the whiskers are added and the reaction is stirred and reacted. After the reaction is completed, the reaction product is cooled and then centrifuged. The precipitate is washed and dried to obtain epoxy-grafted whiskers. Step a2: Stir the epoxy-grafted whiskers and phytic acid solution to react. After the reaction is complete, cool the reaction product, then centrifuge, wash and dry the precipitate to obtain phytic acid-grafted whiskers.

2. The puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 1, characterized in that, The ratio of coupling agent, methanol, deionized water and whiskers in step a1 is 15-20 mL: 1-5 g: 3-5 mL: 3 g; the coupling agent is silane coupling agent KH-560; the whiskers are NP-YW2 basic magnesium sulfate whiskers.

3. The puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 1, characterized in that, In step a2, the ratio of epoxy-grafted whiskers to phytic acid solution is 5g:30-40mL; the mass fraction of the phytic acid solution is 30-50%.

4. The puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 1, characterized in that, The polyfluorophenyl triazine compound was prepared by the following steps: Step b1: 3,5-bis(trifluoromethyl)benzoic acid and 1,2-dichloroethane were stirred and reacted, followed by the addition of thionyl chloride and continued stirring. After the reaction was completed, the reaction product was cooled and then evaporated by rotary evaporation to obtain acyl chloride polyfluorine compound. Step b2: The acyl chloride polyfluorine compound, melamine, triethylamine and N,N-dimethylformamide were stirred and reacted. After the reaction was completed, the reaction product was cooled, then vacuum filtered, and the filtrate was evaporated by rotary evaporation to obtain the polyfluorophenyl triazine compound.

5. The puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 4, characterized in that, The ratio of 3,5-bis(trifluoromethyl)benzoic acid, 1,2-dichloroethane, and thionyl chloride used in step b1 is 10 mmol: 20-25 mL: 30-35 mmol.

6. The puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 4, characterized in that, In step b2, the ratio of the acyl chloride polyfluorinated compound, melamine, triethylamine, and N,N-dimethylformamide is 30 mmol: 10 mmol: 40-50 mmol: 60-70 mL.

7. A method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material, characterized in that, The method for preparing the puncture-resistant and corrosion-resistant fire-resistant cable sheath material as described in any one of claims 1-6 comprises the following steps: Step 1: Weigh out 80-90 parts by weight of polypropylene resin, 25-35 parts by weight of polyvinyl chloride resin, 3-15 parts by weight of phytic acid grafted whiskers, 1-7 parts by weight of polyfluorophenyl triazine compound, 0.8-1.6 parts by weight of lubricant, 8-12 parts by weight of plasticizer, 0.5-0.7 parts by weight of antioxidant and 0.3-0.5 parts by weight of light stabilizer, and set aside. Step 2: Polypropylene resin, polyvinyl chloride resin, phytic acid grafted whiskers, polyfluorophenyl triazine compound, lubricant, plasticizer, antioxidant and light stabilizer are added to a twin-screw extruder and melt-extruded at a temperature of 180-200℃ and a screw speed of 60-80 r / min. After water cooling and granulation, a puncture-resistant and corrosion-resistant fireproof cable sheath material is obtained.

8. The method for preparing a puncture-resistant and corrosion-resistant fire-resistant cable sheath material according to claim 7, characterized in that, The polypropylene resin is PP E02ES; The polyvinyl chloride resin is PVC LS300; The lubricant is calcium stearate; The plasticizer is di-n-octyl adipate; The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in equal mass ratio; The light stabilizer is light stabilizer 770.

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