Rat-proof and ant-proof flame-retardant cable and preparation method thereof

Abstract

The invention relates to the field of cables, in particular to a rat-proof and termite-proof flame-retardant cable and a preparation method thereof, which are used for solving the problems of poor rat-proof and termite-proof effect and flame-retardant effect of the existing cable sheath material. According to the rat-proof and termite-proof flame-retardant cable sheath, the polyethylene resin, the polypropylene resin and the ethylene-vinyl acetate copolymer serve as main raw materials and are reasonably compounded, the advantages of the polyethylene resin, the polypropylene resin and the ethylene-vinyl acetate copolymer are synthesized, good basic performance is provided for the cable sheath, the basic magnesium sulfate whiskers and the boron-nitrogen-phosphorus complexing agent are added and coated, the basic magnesium sulfate whiskers and the boron-nitrogen-phosphorus complexing agent can cooperate with one another, and a multi-layer flame-retardant mechanism is formed; the flame-retardant performance of the cable sheath is remarkably improved, the safety of the cable in a fire disaster is improved, the mechanical property of the cable sheath is remarkably improved due to the existence of the coated basic magnesium sulfate whiskers, the damage to the cable caused by rat and ant biting is reduced, the rat and ant-proof agent is added into the cable sheath, the damage to the cable caused by rat and ant biting is further reduced, and the service life of the cable is prolonged. And normal operation of the cable in areas with frequent rat and ant activities is ensured.

Description

Technical Field

[0001] The present invention relates to the field of cables, and in particular to a rat- and ant-proof flame-retardant cable and a preparation method thereof. Background Art

[0002] With the rapid development of industries such as electricity and communications, cables are increasingly being used. However, they face numerous challenges during use, with rat and ant bites and fire being two of the main safety hazards.

[0003] The gnawing of rats and ants on cables can damage the insulation and sheathing, leading to short circuits, leakage, and other faults, severely impacting the safe operation of power and communication systems and causing significant economic losses. Furthermore, cables are mostly made of flammable polymers, which are highly flammable and easily burn in the event of a fire. These materials produce large amounts of smoke and toxic gases, complicating evacuation and firefighting efforts, and posing serious risks to the environment and human health. Therefore, developing a cable material with both excellent rat-ant resistance and flame retardancy is of great practical significance. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a rat-proof and ant-proof flame-retardant cable and a preparation method thereof, which solves the problem that the existing cable sheath materials have poor rat-proof and ant-proof effects and flame-retardant effects, are prone to cable failures, and not only affect the safe operation of power and communication systems, but also cause serious harm to the environment and human health.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A rat-proof and ant-proof flame-retardant cable, comprising a cable core wire and a rat-proof and ant-proof flame-retardant cable sheath wrapped around the cable core wire;

[0007] The rat-proof and ant-proof flame-retardant cable sheath comprises the following components in parts by weight:

[0008] 25-35 parts of polyethylene resin, 36-42 parts of polypropylene resin, 11-23 parts of ethylene-vinyl acetate copolymer, 8-16 parts of coated basic magnesium sulfate whiskers, 1-7 parts of boron nitrogen phosphorus complex, 2-4 parts of lubricant, 2 parts of rodent and termite repellent, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of light stabilizer;

[0009] Wherein, the coated basic magnesium sulfate whiskers are prepared by the following steps:

[0010] Step a1: adding magnesium sulfate heptahydrate, magnesium oxide, and deionized water to a three-necked flask equipped with a stirrer and a thermometer, stirring the mixture at a temperature of 25-30° C. and a stirring rate of 200-300 r / min for 20-30 minutes, then heating the mixture to 160-170° C. and continuing stirring the mixture for 8-10 hours. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is then placed in a vacuum drying oven and dried at a temperature of 70-75° C. for 3-5 hours to obtain basic magnesium sulfate whiskers;

[0011] Step a2: adding silane coupling agent KH-570, deionized water and anhydrous ethanol to a three-necked flask equipped with a stirrer and a thermometer, ultrasonically treating the mixture at an ultrasonic frequency of 30-40 kHz for 10-15 minutes, then adding basic magnesium sulfate whiskers and continuing ultrasonic treatment for 20-30 minutes, then stirring the mixture at a temperature of 25-30° C. and a stirring rate of 200-300 r / min for 10-20 minutes, then heating the mixture to 80-85° C. and continuing stirring the mixture for 10-20 hours, cooling the reaction product to room temperature after completion of the reaction, then centrifuging the mixture, and then washing the precipitate with distilled water 3-5 times, then placing the mixture in a vacuum drying oven and drying it at a temperature of 60-65° C. for 3-4 hours to obtain alkenyl basic magnesium sulfate whiskers;

[0012] Step a3: Add alkenyl basic magnesium sulfate whiskers, methyl methacrylate, polyvinyl pyrrolidone and anhydrous ethanol to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, introduce nitrogen protection, and stir the reaction at a temperature of 25-30°C and a stirring rate of 200-300r / min for 10-20min. Then, raise the temperature to 70-75°C and add azobisisobutyronitrile solution dropwise while stirring. The dropping rate is controlled to 1-2 drops / s. After the addition is completed, continue stirring and reacting for 7-8h. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is then washed with distilled water 3-5 times, and then placed in a vacuum drying oven and dried at a temperature of 30-35°C for 6-8h to obtain coated basic magnesium sulfate whiskers.

[0013] As a further solution of the present invention: the usage ratio of the magnesium sulfate heptahydrate, magnesium oxide and deionized water in step a1 is 100 mmol: 20-30 mmol: 100-110 mL.

[0014] As a further solution of the present invention: the usage ratio of the silane coupling agent KH-570, deionized water, anhydrous ethanol and basic magnesium sulfate whiskers in step a2 is 10-18 mL: 4-5 mL: 35-40 mL: 2 g.

[0015] As a further embodiment of the present invention, the ratio of the alkenyl magnesium sulfate whiskers, methyl methacrylate, polyvinyl pyrrolidone, anhydrous ethanol, and azobisisobutyronitrile solution in step a3 is 5 g: 1.1-2.9 g: 0.1-0.2 g: 70-80 mL: 10-15 mL.

[0016] As a further embodiment of the present invention: the polyvinyl pyrrolidone in step a3 is PVP K30.

[0017] As a further solution of the present invention: the azobisisobutyronitrile solution in step a3 is a solution formed by dissolving azobisisobutyronitrile in anhydrous ethanol at a ratio of 0.08-0.12 g:10 mL.

[0018] As a further solution of the present invention: the boron nitrogen phosphorus composite agent is prepared by the following steps:

[0019] 4-Aminophenylboronic acid, triethylamine and anhydrous methanol are added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube, a constant pressure dropping funnel and a reflux condenser, and nitrogen protection is introduced. The mixture is stirred and reacted for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 200-300 r / min. Then, phosphorus oxychloride is added dropwise while stirring, and the dropping rate is controlled to 1-2 drops / s. After the addition is completed, the stirring reaction is continued for 10-15 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then vacuum filtered. The filtrate is rotary evaporated to remove the solvent, and then washed with distilled water 3-5 times. Then, the mixture is placed in a vacuum drying oven and dried at a temperature of 30-35° C. for 6-8 hours to obtain a boron nitrogen phosphorus complex.

[0020] As a further embodiment of the present invention, the usage ratio of 4-aminophenylboronic acid, triethylamine, anhydrous methanol and phosphorus oxychloride is 30-35 mmol:35-40 mmol:70-80 mL:10 mmol.

[0021] As a further solution of the present invention: a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0022] Step 1: Weigh 25-35 parts of polyethylene resin, 36-42 parts of polypropylene resin, 11-23 parts of ethylene-vinyl acetate copolymer, 8-16 parts of coated basic magnesium sulfate whiskers, 1-7 parts of boron nitrogen phosphorus complex, 2-4 parts of lubricant, 2 parts of rodent and ant repellent, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of light stabilizer according to weight parts, and set aside;

[0023] Step 2: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 60-80° C. and a stirring rate of 500-600 r / min for 15-35 minutes to obtain a mixture;

[0024] Step 3: Add the mixed material into the extruder, melt blend and extrusion granulate to obtain sheath granules;

[0025] Step 4: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0026] As a further embodiment of the present invention: the polyethylene resin is LDPE LD200;

[0027] As a further embodiment of the present invention: the polypropylene resin is PP 2401.

[0028] As a further solution of the present invention: the ethylene-vinyl acetate copolymer is EVA 6110M.

[0029] As a further embodiment of the present invention: the lubricant is stearic acid.

[0030] The rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1.

[0031] As a further solution of the present invention: the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2.

[0032] As a further solution of the present invention: the light stabilizer is light stabilizer 770.

[0033] Beneficial effects of the present invention:

[0034] The invention discloses a rat-ant-proof flame-retardant cable and a preparation method thereof. The method comprises the following steps: mixing polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, a boron nitrogen phosphorus compound, a lubricant, a rat-ant-proof agent, an antioxidant, and a light stabilizer to obtain a mixture; then adding the mixture to an extruder, performing melt blending and extrusion granulation to obtain sheath pellets; then extruding the sheath pellets onto the surface of a cable core wire through an extruder to form a rat-ant-proof flame-retardant cable sheath, thereby obtaining a rat-ant-proof flame-retardant cable; the rat-ant-proof flame-retardant cable sheath uses polyethylene resin, polypropylene resin, and ethylene-vinyl acetate copolymer as main raw materials; the polyethylene resin has good electrical insulation performance, flexibility, and chemical corrosion resistance; and the polypropylene resin has high heat resistance. , chemical resistance and rigidity, ethylene-vinyl acetate copolymer has good flexibility, wear resistance and low temperature performance. Through reasonable compounding and combining their advantages, it provides good basic performance for cable sheaths, and adding coated basic magnesium sulfate whiskers and boron nitrogen phosphorus composites can work together to form a multi-level flame retardant mechanism, which significantly improves the flame retardant properties of cable sheaths and improves the safety of cables in fire situations. Moreover, the presence of coated basic magnesium sulfate whiskers significantly improves the mechanical properties of cable sheaths, reduces the damage to cables caused by rats and ants, and adding rat and ant repellents to cable sheaths can stimulate the olfactory and taste nerves of rats and ants, keeping them away from cables, further reducing the damage to cables caused by rats and ants, and ensuring the normal operation of cables in areas where rats and ants are frequently active.

[0035] In the process of preparing rat-proof and ant-proof flame-retardant cables, a coated basic magnesium sulfate whisker is first prepared. First, basic magnesium sulfate whiskers are prepared using magnesium sulfate heptahydrate and magnesium oxide as raw materials. Then, the basic magnesium sulfate whiskers are modified using a silane coupling agent KH-570. The siloxane groups on the silane coupling agent KH-570 are hydrolyzed to form silanols that are grafted onto the surface of the basic magnesium sulfate whiskers. At the same time, a large number of alkenyl groups are introduced to obtain alkenyl basic magnesium sulfate whiskers. Then, the alkenyl basic magnesium sulfate whiskers and methyl methacrylate are reacted, and polymerization is achieved under the initiation of azobisisobutyronitrile. Polymethyl methacrylate is coated on the surface of the basic magnesium sulfate whiskers to obtain coated basic magnesium sulfate whiskers. The basic magnesium sulfate whiskers have high It has the characteristics of strength and high modulus. The polymethacrylate coated on its surface can make it have good compatibility with polyethylene resin, polypropylene resin, and ethylene-vinyl acetate copolymer, so that it can be evenly dispersed in the matrix. When the cable sheath is subjected to external force, the basic magnesium sulfate whiskers can effectively bear most of the load, effectively enhance the mechanical properties of the cable sheath, and thus improve the ability of the cable sheath to resist the bite of rats and ants. At the same time, the basic magnesium sulfate whiskers can release a large amount of crystalline water when decomposed at high temperature. The evaporation of crystalline water absorbs a large amount of heat, inhibiting thermal decomposition, and the magnesium oxide produced by the decomposition has a high melting point and good thermal insulation properties, forming a layer of heat-insulating and oxygen-isolating barrier, which significantly improves the flame retardant, fire-resistant and high-temperature resistance of the cable sheath.

[0036] In the process of preparing rat-proof and ant-proof flame-retardant cables, a boron-nitrogen-phosphorus composite was also prepared. 4-aminophenylboronic acid and phosphorus oxychloride were reacted, and the amino group on the 4-aminophenylboronic acid reacted with the chlorine atom on the phosphorus oxychloride to introduce nitrogen and boron elements to obtain a boron-nitrogen-phosphorus composite. The molecular structure of the boron-nitrogen-phosphorus composite contains a large amount of nitrogen, boron and phosphorus elements. The three elements work together to form a multi-level flame retardant mechanism, giving it excellent flame retardant properties. When added to the cable sheath and combined with the coated basic magnesium sulfate whiskers, the flame retardant, fire-resistant and high-temperature resistant properties of the cable sheath are significantly improved, thereby improving the safety of the cable in the event of a fire. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Example 1:

[0039] This embodiment is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0040] Step S1: 100 mmol of magnesium sulfate heptahydrate, 20 mmol of magnesium oxide, and 100 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 25° C. and a stirring rate of 200 r / min for 20 minutes. The mixture was then heated to 160° C. and stirred for 8 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was then placed in a vacuum drying oven and dried at 70° C. for 3 hours to obtain basic magnesium sulfate whiskers.

[0041] Step S2: 10 mL of silane coupling agent KH-570, 4 mL of deionized water, and 35 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer and a thermometer, and ultrasonically treated for 10 minutes at an ultrasonic frequency of 30 kHz. Then, 2 g of basic magnesium sulfate whiskers were added and ultrasonically treated for 20 minutes. Then, the mixture was stirred at 25° C. and a stirring rate of 200 r / min for 10 minutes. Then, the mixture was heated to 80° C. and stirred for 10 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water three times and then placed in a vacuum drying oven and dried at 60° C. for 3 hours to obtain alkenyl basic magnesium sulfate whiskers.

[0042] Step S3: 5 g of alkenyl basic magnesium sulfate whiskers, 1.1 g of methyl methacrylate, 0.1 g of polyvinylpyrrolidone PVP K30 and 70 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen protection was introduced. The mixture was stirred and reacted for 10 minutes at a temperature of 25 ° C and a stirring rate of 200 r / min. Then, 10 mL of azobisisobutyronitrile was added dropwise while stirring. The azobisisobutyronitrile solution prepared by dissolving 0.08 g:10 mL of anhydrous ethanol was added dropwise while stirring. The dropping rate was controlled to 1 drop / s. After the addition was completed, the stirring reaction was continued for 7 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 3 times, and then placed in a vacuum drying oven and dried at 30 ° C for 6 hours to obtain coated basic magnesium sulfate whiskers;

[0043] Step S4: 30 mmol 4-aminophenylboronic acid, 35 mmol triethylamine and 70 mL anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube, a constant pressure dropping funnel and a reflux condenser, and nitrogen protection was introduced. The mixture was stirred and reacted for 20 minutes at a temperature of 25° C. and a stirring rate of 200 r / min. Then, 10 mmol phosphorus oxychloride was added dropwise while stirring, and the dropping rate was controlled to 1 drop / s. After the addition was completed, the stirring reaction was continued for 10 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then washed with distilled water 3 times. Then, it was placed in a vacuum drying oven and dried at a temperature of 30° C. for 6 hours to obtain a boron nitrogen phosphorus composite agent;

[0044] Step S5: Weigh 25 parts of polyethylene resin, 36 parts of polypropylene resin, 11 parts of ethylene-vinyl acetate copolymer, 8 parts of coated basic magnesium sulfate whiskers, 1 part of boron nitrogen phosphorus complex, 2 parts of lubricant, 2 parts of rat and ant repellent, 0.5 parts of antioxidant, and 0.3 parts of light stabilizer in parts by weight for later use; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0045] Step S6: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 60° C. and a stirring rate of 500 r / min for 15 minutes to obtain a mixture;

[0046] Step S7: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0047] Step S8: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0048] Example 2:

[0049] This embodiment is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0050] Step S1: 100 mmol of magnesium sulfate heptahydrate, 25 mmol of magnesium oxide, and 105 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 28° C. and a stirring rate of 250 r / min for 25 minutes. The mixture was then heated to 165° C. and stirred for 9 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was then placed in a vacuum drying oven and dried at 72° C. for 4 hours to obtain basic magnesium sulfate whiskers.

[0051] Step S2: 14 mL of silane coupling agent KH-570, 4.5 mL of deionized water, and 38 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer and a thermometer, and ultrasonically treated for 12 minutes at an ultrasonic frequency of 35 kHz. Then, 2 g of basic magnesium sulfate whiskers were added and ultrasonically treated for 25 minutes. Then, the mixture was stirred at a temperature of 28° C. and a stirring rate of 250 r / min for 15 minutes. Then, the mixture was heated to 82° C. and stirred for 15 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water four times and then placed in a vacuum drying oven and dried at a temperature of 62° C. for 3.5 hours to obtain alkenyl basic magnesium sulfate whiskers.

[0052] Step S3: 5 g of alkenyl basic magnesium sulfate whiskers, 2 g of methyl methacrylate, 0.15 g of polyvinylpyrrolidone PVPK30 and 75 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen protection was introduced. The reaction was stirred at a temperature of 28 ° C and a stirring rate of 250 r / min for 15 minutes. Then, the temperature was raised to 72 ° C and 12 mL of azobisisobutyronitrile was dissolved in anhydrous ethanol at a ratio of 0.1 g:10 mL. The azobisisobutyronitrile solution was added dropwise while stirring. The drop rate was controlled to 1 drop / s. After the addition was completed, the stirring reaction was continued for 7.5 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 4 times, and then placed in a vacuum drying oven and dried at a temperature of 32 ° C for 7 hours to obtain coated basic magnesium sulfate whiskers;

[0053] Step S4: 32 mmol 4-aminophenylboronic acid, 38 mmol triethylamine and 75 mL anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube, a constant pressure dropping funnel and a reflux condenser, and nitrogen protection was introduced. The reaction was stirred for 25 minutes at a temperature of 28° C. and a stirring rate of 250 r / min. Then, 10 mmol phosphorus oxychloride was added dropwise while stirring, and the dropping rate was controlled to 1 drop / s. After the addition was completed, the stirring reaction was continued for 12 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then washed with distilled water 4 times. Then, it was placed in a vacuum drying oven and dried at a temperature of 32° C. for 7 hours to obtain a boron nitrogen phosphorus complex.

[0054] Step S5: 30 parts of polyethylene resin, 39 parts of polypropylene resin, 17 parts of ethylene-vinyl acetate copolymer, 12 parts of coated basic magnesium sulfate whiskers, 4 parts of boron nitrogen phosphorus complex, 3 parts of lubricant, 2 parts of rat and ant repellent, 1 part of antioxidant and 0.4 parts of light stabilizer are weighed in parts by weight and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0055] Step S6: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 70° C. and a stirring rate of 550 r / min for 25 minutes to obtain a mixture;

[0056] Step S7: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0057] Step S8: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0058] Example 3:

[0059] This embodiment is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0060] Step S1: 100 mmol of magnesium sulfate heptahydrate, 30 mmol of magnesium oxide, and 110 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and a stirring rate of 300 r / min for 30 minutes. The mixture was then heated to 170° C. and stirred for 10 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was then placed in a vacuum drying oven and dried at 75° C. for 5 hours to obtain basic magnesium sulfate whiskers.

[0061] Step S2: 18 mL of silane coupling agent KH-570, 5 mL of deionized water, and 40 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer and a thermometer, and ultrasonically treated for 15 minutes at an ultrasonic frequency of 40 kHz. Then, 2 g of basic magnesium sulfate whiskers were added and ultrasonically treated for 30 minutes. Then, the mixture was stirred at a temperature of 30° C. and a stirring rate of 300 r / min for 20 minutes. Then, the mixture was heated to 85° C. and stirred for 20 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 5 times, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 4 hours to obtain alkenyl basic magnesium sulfate whiskers.

[0062] Step S3: 5 g of alkenyl basic magnesium sulfate whiskers, 2.9 g of methyl methacrylate, 0.2 g of polyvinylpyrrolidone PVP K30 and 80 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen protection was introduced. The mixture was stirred and reacted for 20 minutes at a temperature of 30° C. and a stirring rate of 300 r / min. Then, 15 mL of azobisisobutyronitrile was added dropwise while stirring. The azobisisobutyronitrile solution prepared by dissolving 0.12 g:10 mL of azobisisobutyronitrile in anhydrous ethanol was added dropwise while stirring. The dropping rate was controlled to 2 drops / s. After the addition was completed, the stirring reaction was continued for 8 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 5 times, and then placed in a vacuum drying oven and dried at 35° C. for 8 hours to obtain coated basic magnesium sulfate whiskers;

[0063] Step S4: 35mmol 4-aminophenylboronic acid, 40mmol triethylamine and 80mL anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube, a constant pressure dropping funnel and a reflux condenser, and nitrogen protection was introduced. The mixture was stirred for 30 minutes at a temperature of 30°C and a stirring rate of 300r / min. Then, 10mmol phosphorus oxychloride was added dropwise while stirring, and the dropping rate was controlled to 2 drops / s. After the addition was completed, the stirring reaction was continued for 15 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then washed with distilled water 5 times. Then, it was placed in a vacuum drying oven and dried at a temperature of 35°C for 8 hours to obtain a boron nitrogen phosphorus composite agent;

[0064] Step S5: 35 parts of polyethylene resin, 42 parts of polypropylene resin, 23 parts of ethylene-vinyl acetate copolymer, 16 parts of coated basic magnesium sulfate whiskers, 7 parts of boron nitrogen phosphorus complex, 4 parts of lubricant, 2 parts of rat and ant repellent, 1.5 parts of antioxidant and 0.5 parts of light stabilizer are weighed in parts by weight and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0065] Step S6: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 80° C. and a stirring rate of 600 r / min for 35 minutes to obtain a mixture;

[0066] Step S7: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0067] Step S8: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0068] Comparative Example 1:

[0069] This comparative example is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0070] Step S1: 35 parts of polyethylene resin, 42 parts of polypropylene resin, 23 parts of ethylene-vinyl acetate copolymer, 4 parts of lubricant, 2 parts of rat and ant repellent, 1.5 parts of antioxidant, and 0.5 parts of light stabilizer are weighed and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0071] Step S2: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, lubricant, rodent-ant repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 80° C. and a stirring rate of 600 r / min for 35 minutes to obtain a mixture;

[0072] Step S3: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0073] Step S4: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-ant-proof flame-retardant cable sheath, thereby obtaining a rat-ant-proof flame-retardant cable.

[0074] Comparative Example 2:

[0075] This comparative example is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0076] Step S1: 100 mmol of magnesium sulfate heptahydrate, 30 mmol of magnesium oxide, and 110 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and a stirring rate of 300 r / min for 30 minutes. The mixture was then heated to 170° C. and stirred for 10 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was then placed in a vacuum drying oven and dried at 75° C. for 5 hours to obtain basic magnesium sulfate whiskers.

[0077] Step S2: 18 mL of silane coupling agent KH-570, 5 mL of deionized water, and 40 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer and a thermometer, and ultrasonically treated for 15 minutes at an ultrasonic frequency of 40 kHz. Then, 2 g of basic magnesium sulfate whiskers were added and ultrasonically treated for 30 minutes. Then, the mixture was stirred at a temperature of 30° C. and a stirring rate of 300 r / min for 20 minutes. Then, the mixture was heated to 85° C. and stirred for 20 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 5 times, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 4 hours to obtain alkenyl basic magnesium sulfate whiskers.

[0078] Step S3: 5 g of alkenyl basic magnesium sulfate whiskers, 2.9 g of methyl methacrylate, 0.2 g of polyvinylpyrrolidone PVP K30 and 80 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen protection was introduced. The mixture was stirred and reacted for 20 minutes at a temperature of 30° C. and a stirring rate of 300 r / min. Then, 15 mL of azobisisobutyronitrile was added dropwise while stirring. The azobisisobutyronitrile solution prepared by dissolving 0.12 g:10 mL of azobisisobutyronitrile in anhydrous ethanol was added dropwise while stirring. The dropping rate was controlled to 2 drops / s. After the addition was completed, the stirring reaction was continued for 8 hours. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with distilled water 5 times, and then placed in a vacuum drying oven and dried at 35° C. for 8 hours to obtain coated basic magnesium sulfate whiskers;

[0079] Step S4: 35 parts of polyethylene resin, 42 parts of polypropylene resin, 23 parts of ethylene-vinyl acetate copolymer, 16 parts of coated basic magnesium sulfate whiskers, 4 parts of lubricant, 2 parts of rat and ant repellent, 1.5 parts of antioxidant, and 0.5 parts of light stabilizer are weighed in parts by weight and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0080] Step S5: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, lubricant, rodent and termite repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 80° C. and a stirring rate of 600 r / min for 35 minutes to obtain a mixture;

[0081] Step S6: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0082] Step S7: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0083] Comparative Example 3:

[0084] This comparative example is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0085] Step S1: 35mmol 4-aminophenylboronic acid, 40mmol triethylamine and 80mL anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube, a constant pressure dropping funnel and a reflux condenser, and nitrogen protection was introduced. The mixture was stirred for 30 minutes at a temperature of 30°C and a stirring rate of 300r / min. Then, 10mmol phosphorus oxychloride was added dropwise while stirring, and the dropping rate was controlled to 2 drops / s. After the addition was completed, the stirring reaction was continued for 15 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then washed with distilled water 5 times. Then, it was placed in a vacuum drying oven and dried at a temperature of 35°C for 8 hours to obtain a boron nitrogen phosphorus composite agent;

[0086] Step S2: 35 parts of polyethylene resin, 42 parts of polypropylene resin, 23 parts of ethylene-vinyl acetate copolymer, 7 parts of boron nitrogen phosphorus complex, 4 parts of lubricant, 2 parts of rat and ant repellent, 1.5 parts of antioxidant and 0.5 parts of light stabilizer are weighed and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0087] Step S3: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 80° C. and a stirring rate of 600 r / min for 35 minutes to obtain a mixture;

[0088] Step S4: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0089] Step S5: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0090] Comparative Example 4:

[0091] This comparative example is a method for preparing a rat-proof and ant-proof flame-retardant cable, comprising the following steps:

[0092] Step S1: 100 mmol of magnesium sulfate heptahydrate, 30 mmol of magnesium oxide, and 110 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and a stirring rate of 300 r / min for 30 minutes. The mixture was then heated to 170° C. and stirred for 10 hours. After the reaction, the reaction product was cooled to room temperature and then centrifuged. The precipitate was then placed in a vacuum drying oven and dried at 75° C. for 5 hours to obtain basic magnesium sulfate whiskers.

[0093] Step S2: 35 parts of polyethylene resin, 42 parts of polypropylene resin, 23 parts of ethylene-vinyl acetate copolymer, 16 parts of basic magnesium sulfate whiskers, 7 parts of DOPO, 4 parts of lubricant, 2 parts of rat and ant repellent, 1.5 parts of antioxidant, and 0.5 parts of light stabilizer are weighed and set aside; the polyethylene resin is LDPE LD200; the polypropylene resin is PP 2401; the ethylene-vinyl acetate copolymer is EVA 6110M; the lubricant is stearic acid; the rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; and the light stabilizer is light stabilizer 770;

[0094] Step S3: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, basic magnesium sulfate whiskers, DOPO, lubricant, rodent and termite repellent, antioxidant, and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 80° C. and a stirring rate of 600 rpm for 35 minutes to obtain a mixture;

[0095] Step S4: adding the mixed material into an extruder, and performing melt blending and extrusion granulation to obtain sheath granules;

[0096] Step S5: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

[0097] The rat- and ant-proof flame-retardant cable sheaths of Examples 1-3 and Comparative Examples 1-4 were tested for oxygen index according to GB / T 2406.2-2009, flame retardancy according to UL94, and tensile strength according to GB / T 1040.2-2006. The test results are shown in the following table:

[0098] sample Oxygen index, % Flame retardant grade, % Tensile strength, MPa Example 1 44.9 V-0 33.6 Example 2 46.2 V-0 34.9 Example 3 47.6 V-0 36.1 Comparative Example 1 28.1 V-2 20.7 Comparative Example 2 40.9 V-1 31.4 Comparative Example 3 41.4 V-1 22.3 Comparative Example 4 43.2 V-1 30.9

[0099] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-4, it can be seen that the rat-proof and ant-proof flame-retardant cable sheath of the present application has excellent flame retardant properties and mechanical properties, which further indicates that the coating of basic magnesium sulfate whiskers and boron nitrogen phosphorus composite agent plays a significant role in the performance of the rat-proof and ant-proof flame-retardant cable sheath.

[0100] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0101] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the scope of protection of the present invention.

Claims

1. A flame retardant cable that is rat and ant proof, characterized in that: Including cable core wires and rat-ant-proof flame-retardant cable sheath wrapped around the cable core wires; The rat-proof and ant-proof flame-retardant cable sheath comprises the following components in parts by weight: 25-35 parts of polyethylene resin, 36-42 parts of polypropylene resin, 11-23 parts of ethylene-vinyl acetate copolymer, 8-16 parts of coated basic magnesium sulfate whiskers, 1-7 parts of boron nitrogen phosphorus complex, 2-4 parts of lubricant, 2 parts of rodent and termite repellent, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of light stabilizer; Wherein, the coated basic magnesium sulfate whiskers are prepared by the following steps: Step a1: stirring magnesium sulfate heptahydrate, magnesium oxide, and deionized water to react, cooling the reaction product after the reaction is completed, centrifuging it, and then drying the precipitate to obtain basic magnesium sulfate whiskers; Step a2: ultrasonically treating the silane coupling agent KH-570, deionized water, and anhydrous ethanol, then adding basic magnesium sulfate whiskers and continuing the ultrasonic treatment, followed by stirring and reacting. After the reaction is completed, the reaction product is cooled and centrifuged, and the precipitate is washed and dried to obtain alkenyl basic magnesium sulfate whiskers; Step a3: stirring the alkenyl basic magnesium sulfate whiskers, methyl methacrylate, polyvinyl pyrrolidone and anhydrous ethanol, then adding the azobisisobutyronitrile solution and continuing to stir the reaction. After the reaction is completed, the reaction product is cooled and then centrifuged. The precipitate is then washed and dried to obtain coated basic magnesium sulfate whiskers.

2. The rat-proof and ant-proof flame-retardant cable according to claim 1, characterized in that: The usage ratio of the magnesium sulfate heptahydrate, magnesium oxide and deionized water in step a1 is 100 mmol: 20-30 mmol: 100-110 mL.

3. The rat-proof and ant-proof flame-retardant cable according to claim 1, characterized in that: The usage ratio of the silane coupling agent KH-570, deionized water, anhydrous ethanol and basic magnesium sulfate whiskers in step a2 is 10-18 mL: 4-5 mL: 35-40 mL: 2 g.

4. The rat-proof and ant-proof flame-retardant cable according to claim 1, characterized in that: In step a3, the usage ratio of the alkenyl magnesium sulfate whiskers, methyl methacrylate, polyvinyl pyrrolidone, anhydrous ethanol and azobisisobutyronitrile solution is 5 g: 1.1-2.9 g: 0.1-0.2 g: 70-80 mL: 10-15 mL; the polyvinyl pyrrolidone is PVP K30.

5. The rat-proof and ant-proof flame-retardant cable according to claim 1, characterized in that: The azobisisobutyronitrile solution in step a3 is a solution formed by dissolving azobisisobutyronitrile in anhydrous ethanol at a ratio of 0.08-0.12 g:10 mL.

6. The rat-proof and ant-proof flame-retardant cable according to claim 1, characterized in that: The boron, nitrogen and phosphorus composite agent is prepared by the following steps: 4-Aminophenylboronic acid, triethylamine and anhydrous methanol are stirred for reaction, and then phosphorus oxychloride is added and the stirring reaction is continued. After the reaction is completed, the reaction product is cooled and then vacuum filtered. The filtrate is rotary evaporated, washed and dried to obtain a boron nitrogen phosphorus complex.

7. The rat-proof and ant-proof flame-retardant cable according to claim 6, characterized in that: The usage ratio of the 4-aminophenylboronic acid, triethylamine, anhydrous methanol and phosphorus oxychloride is 30-35 mmol: 35-40 mmol: 70-80 mL: 10 mmol.

8. A method for preparing a rat-proof and ant-proof flame-retardant cable, characterized in that: The following steps are involved: Step 1: Weigh 25-35 parts of polyethylene resin, 36-42 parts of polypropylene resin, 11-23 parts of ethylene-vinyl acetate copolymer, 8-16 parts of coated basic magnesium sulfate whiskers, 1-7 parts of boron nitrogen phosphorus complex, 2-4 parts of lubricant, 2 parts of rodent and ant repellent, 0.5-1.5 parts of antioxidant and 0.3-0.5 parts of light stabilizer according to weight parts, and set aside; Step 2: adding polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer, coated basic magnesium sulfate whiskers, boron nitrogen phosphorus complex, lubricant, rodent and termite repellent, antioxidant and light stabilizer into a high-speed mixer, stirring and mixing at a temperature of 60-80° C. and a stirring rate of 500-600 r / min for 15-35 minutes to obtain a mixture; Step 3: Add the mixed material into the extruder, melt blend and extrusion granulate to obtain sheath granules; Step 4: Extruding the sheath pellets onto the surface of the cable core wire through an extruder to form a rat-proof and ant-proof flame-retardant cable sheath, thereby obtaining a rat-proof and ant-proof flame-retardant cable.

9. The method for preparing a rat-proof and ant-proof flame-retardant cable according to claim 8, characterized in that: The polyethylene resin is LDPE LD200; The polypropylene resin is PP 2401; The ethylene-vinyl acetate copolymer is EVA 6110M; The lubricant is stearic acid; The rat and ant repellent is a mixture of peppermint oil and capsaicin in a mass ratio of 1:1; The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; The light stabilizer is light stabilizer 770.