Fire-resistant communication cable for radiation-resistant nuclear power plant and preparation method thereof

Abstract

The invention relates to the field of communication cables, and in particular to a fire-resistant communication cable for a radiation-resistant nuclear power plant and a preparation method thereof, which are used to solve the problem of poor radiation resistance and fire resistance of existing communication cables. In the preparation method, a fire-resistant radiation-proofing agent is firstly prepared in the process of preparing the fire-resistant communication cable for a radiation-resistant nuclear power plant, and the fire-resistant radiation-proofing agent is added to the cable protective jacket to give it good radiation resistance and fire resistance, which can greatly reduce the potential threat to the communication cable caused by a large amount of radioactive substances generated during the operation of the nuclear power plant, can inhibit the rapid spread of flames on the communication cable, reduce the probability of fire in the nuclear power plant, and avoid huge hidden dangers to personnel health and property safety.

Description

Technical Field

[0001] The invention relates to the field of communication cables, and in particular to a fire-resistant communication cable for a radiation-resistant nuclear power plant and a preparation method thereof. Background Art

[0002] Communication cables are cables that transmit telephone, telegraph, fax documents, television and radio programs, data and other electrical signals. A nuclear power plant is a facility that uses nuclear energy to generate electricity. In a nuclear power plant, the nuclear reactor is the core part, which uses nuclear fuel to generate steam, and then drives the turbine to drive the generator to generate electricity. However, a large amount of radioactive substances will be generated during the operation of the nuclear power plant, which will pose a potential threat to communication cables. In addition, these communication cables have poor fire resistance. When a fire occurs in a nuclear power plant, the flame spreads quickly on the communication cables, which is easy to cause a larger fire, posing a huge hidden danger to personnel health and property safety.

[0003] Therefore, developing a communication cable that can resist radiation and has good fire resistance and can inhibit the spread of flames is an urgent need in the current technical field. Summary of the invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a fire-resistant communication cable for a radiation-resistant nuclear power plant and a preparation method thereof: polypropylene resin, ethylene propylene diene monomer rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and a fire-resistant radiation-proof agent are added to a mixer to mix to obtain a mixture, the mixture is added to an extruder, and the mixture is extruded and coated on the outside of the cable body to form a cable protective jacket to obtain the fire-resistant communication cable for a radiation-resistant nuclear power plant, which solves the problem of poor radiation resistance and fire resistance of existing communication cables.

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

[0006] A fire-resistant communication cable for a radiation-resistant nuclear power plant, comprising a cable body and a cable protective jacket wrapped around the cable body;

[0007] Wherein, the cable protective jacket comprises the following components in parts by weight:

[0008] 100-110 parts of polypropylene resin, 25-35 parts of EPDM rubber, 3-6 parts of antioxidant DSTP, 1-5 parts of calcium stearate, 4-10 parts of plasticizer DEHP, 6-12 parts of boron nitride and 2-12 parts of fire-resistant and radiation-proof agent.

[0009] As a further solution of the present invention: the fire-resistant radiation-proof agent is prepared by the following steps:

[0010] Step S1: adding p-hydroxybenzaldehyde, N-chlorosuccinimide and anhydrous tetrahydrofuran into 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 500-600 r / min for 20-30 min, then heating the mixture to 50-55° C. and continuing to stir the mixture for 15-20 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation, and then silica gel column chromatography is performed using a mixed solvent to obtain an intermediate 1;

[0011] The reaction principle is as follows:

[0012]

[0013] Step S2: adding phosphorus oxychloride and pentaerythritol into a three-necked flask equipped with a stirrer, a thermometer and a nitrogen gas guide tube, introducing nitrogen protection, stirring the reaction at a temperature of 80-85° C. and a stirring rate of 500-600 r / min for 2-3 hours, then heating to 110-115° C. and continuing to stir the reaction for 8-10 hours. After the reaction is completed, the reaction product is cooled to room temperature, then washed with anhydrous ether, benzene and dichloromethane for 3-5 times in sequence, and then placed in a vacuum drying oven and dried at a temperature of 60-65° C. for 4-5 hours to obtain intermediate 2;

[0014] The reaction principle is as follows:

[0015]

[0016] Step S3: adding intermediate 1, intermediate 2, anhydrous potassium carbonate and anhydrous tetrahydrofuran to a three-necked flask equipped with a stirrer and a thermometer, stirring the reaction at a temperature of -5-0°C and a stirring rate of 500-600 r / min for 2-3 hours, then heating to 25-30°C and continuing to stir the reaction for 10-15 hours, centrifuging the reaction product after the reaction is completed, adding the supernatant to deionized water, and then vacuum filtering, washing the filter cake with distilled water for 2-3 times, and then placing it in a vacuum drying oven, and drying it at a temperature of 60-65°C for 8-10 hours to obtain intermediate 3;

[0017] The reaction principle is as follows:

[0018]

[0019] Step S4: adding monoethanolamine borate and anhydrous ethanol to a three-necked flask equipped with a stirrer and a thermometer, stirring the mixture for 40-50 min at a temperature of 25-30° C. and a stirring rate of 500-600 r / min, then adding intermediate 3 and continuing to stir the mixture for 10-15 h. After the reaction is completed, vacuum filtering the reaction product, placing the filter cake in a vacuum drying oven, and drying the mixture at a temperature of 60-65° C. for 10-15 h to obtain intermediate 4;

[0020] The reaction principle is as follows:

[0021]

[0022] Step S5: Add intermediate 4 and N,N-dimethylformamide to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir the mixture for 40-50 min at a temperature of 45-50° C. and a stirring rate of 500-600 r / min. Then, add DOPO and continue stirring the mixture for 10-15 min. Then, heat the mixture to reflux and stir the mixture for 10-15 h. After the reaction is completed, cool the reaction product to room temperature, and then remove the solvent by rotary evaporation to obtain intermediate 5.

[0023] The reaction principle is as follows:

[0024]

[0025] Step S6: Add the intermediate 5, 4-hydroxyphenylboronic acid, triethylamine and anhydrous tetrahydrofuran to a three-necked flask equipped with a stirrer and a thermometer, stir and react for 2-3 hours at a temperature of 25-30°C and a stirring rate of 500-600r / min, then heat to 55-60°C and continue stirring and reacting for 8-10 hours. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, then wash with distilled water 2-3 times, then place in a vacuum drying oven, and dry at a temperature of 60-65°C for 8-10 hours to obtain a fire-resistant radiation-proof agent.

[0026] The reaction principle is as follows:

[0027]

[0028] As a further solution of the present invention: the dosage ratio of the p-hydroxybenzaldehyde, N-chlorosuccinimide and anhydrous tetrahydrofuran in step S1 is 10mmol:22-25mmol:40-50mL, and the mixed solvent is a mixture of dichloromethane and anhydrous methanol in a volume ratio of 15-20:1.

[0029] As a further solution of the present invention: the usage ratio of the phosphorus oxychloride and pentaerythritol in step S2 is 0.55-0.6 mol:0.1 mol.

[0030] As a further solution of the present invention: the usage ratio of the intermediate 1, intermediate 2, anhydrous potassium carbonate and anhydrous tetrahydrofuran in step S3 is 20 mmol: 10 mmol: 22-25 mmol: 60-80 mL.

[0031] As a further solution of the present invention: the usage ratio of the monoethanolamine borate, anhydrous ethanol and intermediate 3 in step S4 is 20 mmol: 60-80 mL: 10 mmol.

[0032] As a further solution of the present invention: the usage ratio of the intermediate 4, N,N-dimethylformamide and DOPO in step S5 is 10 mmol: 100-120 mL: 20 mmol.

[0033] As a further solution of the present invention: the usage ratio of the intermediate 5, 4-hydroxyphenylboronic acid, triethylamine and anhydrous tetrahydrofuran in step S6 is 10 mmol: 40 mmol: 45-50 mmol: 120-150 mL.

[0034] As a further solution of the present invention: a method for preparing a fire-resistant communication cable for a radiation-resistant nuclear power plant comprises the following steps:

[0035] Step 1: weigh 100-110 parts of polypropylene resin, 25-35 parts of EPDM rubber, 3-6 parts of antioxidant DSTP, 1-5 parts of calcium stearate, 4-10 parts of plasticizer DEHP, 6-12 parts of boron nitride and 2-12 parts of fire-resistant radiation-proof agent according to weight parts, and set aside;

[0036] Step 2: Add polypropylene resin, EPDM rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and fire-resistant radiation-proof agent into a mixer, mix at a temperature of 55-60° C. for 30-40 minutes, then heat to 90-100° C. and continue mixing for 1-1.5 hours to obtain a mixture;

[0037] Step 3: Add the mixture into an extruder, and coat it on the outside of the cable body through extrusion to form a cable protective jacket, thereby obtaining the fire-resistant communication cable for the radiation-resistant nuclear power plant.

[0038] Beneficial effects of the present invention:

[0039] The invention discloses a fire-resistant communication cable for a radiation-resistant nuclear power station and a preparation method thereof. The invention comprises the following steps: adding polypropylene resin, ethylene propylene diene monomer rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and a fire-resistant radiation-proof agent into a mixer for mixing to obtain a mixture, adding the mixture into an extruder, and coating the mixture on the outside of a cable body through extrusion to form a cable protective jacket to obtain the fire-resistant communication cable for a radiation-resistant nuclear power station. In the preparation method, the fire-resistant radiation-proof agent is added into the cable protective jacket, and the fire-resistant radiation-proof agent gives the cable protective jacket good radiation resistance and fire resistance, which can greatly reduce the potential threat to the communication cable caused by a large amount of radioactive substances generated during the operation of the nuclear power station, can inhibit the rapid spread of flames on the communication cable, reduce the probability of fire in the nuclear power station, and avoid huge hidden dangers to personnel health and property safety.

[0040] In the process of preparing fire-resistant communication cables for radiation-resistant nuclear power plants, a fire-resistant radiation inhibitor is first prepared. First, p-hydroxybenzaldehyde is chlorinated with N-chlorosuccinimide to introduce chlorine atoms, and then phosphorus oxychloride and pentaerythritol are reacted to generate intermediate 2. Then, the hydroxyl group on intermediate 1 is reacted with the chlorine atom on the intermediate to generate intermediate 3. Then, the amino group on monoethanolamine borate is reacted with the aldehyde group on intermediate 3 to introduce a boronic acid group and an olefin group to generate intermediate 4. Then, the N=C bond on intermediate 4 reacts with the HP bond on DOPO to generate intermediate 5. Then, the chlorine atom on intermediate 5 reacts with the hydroxyl group on 4-hydroxyphenylboronic acid to introduce a boronic acid group to generate a fire-resistant radiation inhibitor. The molecular structure of the fire-resistant radiation inhibitor is as follows: The structure contains a large number of ring structures with high stability, which gives it good heat resistance. At the same time, organic phosphorus, organic nitrogen and organic boron are introduced. Under the synergistic effect of the three, the fire-resistant and radiation-proof agent is given good fire-resistant and flame-retardant properties, which can avoid ignition and even quickly extinguish after ignition, thereby inhibiting the spread of flames. In addition, boron can absorb neutrons and can also react with gamma rays. Therefore, boron atoms have the ability to absorb and reduce radiation to achieve radiation resistance, thus giving the fire-resistant and radiation-proof agent good radiation resistance. Therefore, the fire-resistant and radiation-proof agent is added to the cable protective sheath to give it good radiation resistance and fire resistance. In addition, the addition of boron nitride enhances the mechanical properties of the cable protective sheath, while also supplementing nitrogen atoms to further improve its radiation resistance. DETAILED DESCRIPTION

[0041] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0042] Embodiment 1:

[0043] This embodiment is a method for preparing a fire-resistant radiation-proof agent, comprising the following steps:

[0044] Step S1: 10 mmol of p-hydroxybenzaldehyde, 22 mmol of N-chlorosuccinimide and 40 mL of anhydrous tetrahydrofuran 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 500 r / min for 20 min, and then the mixture was heated to 50° C. and the stirring reaction was continued for 15 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation, and then silica gel column chromatography was performed with a mixed solvent prepared by mixing dichloromethane and anhydrous methanol in a volume ratio of 15:1 to obtain intermediate 1;

[0045] Step S2: 0.55 mol of phosphorus oxychloride and 0.1 mol of pentaerythritol were added to a three-necked flask equipped with a stirrer, a thermometer and a nitrogen gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at 80° C. and a stirring rate of 500 r / min for 2 h, and then the mixture was heated to 110° C. and stirred for 8 h. After the reaction was completed, the reaction product was cooled to room temperature, and then washed with anhydrous ether, benzene and dichloromethane for 3 times in sequence, and then placed in a vacuum drying oven and dried at 60° C. for 4 h to obtain intermediate 2;

[0046] Step S3: 20 mmol of intermediate 1, 10 mmol of intermediate 2, 22 mmol of anhydrous potassium carbonate and 60 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of -5°C and a stirring rate of 500 r / min for 2 h, and then the temperature was raised to 25°C and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was centrifuged, and the supernatant was added to deionized water, and then vacuum filtered. The filter cake was washed twice with distilled water, and then placed in a vacuum drying oven and dried at a temperature of 60°C for 8 h to obtain intermediate 3;

[0047] Step S4: 20 mmol of monoethanolamine borate and 60 mL of anhydrous ethanol 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 500 r / min for 40 min. Then, 10 mmol of intermediate 3 was added and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was vacuum filtered, and the filter cake was placed in a vacuum drying oven and dried at 60° C. for 10 h to obtain intermediate 4;

[0048] Step S5: 10 mmol of intermediate 4 and 100 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stirred for reaction at 45°C and a stirring rate of 500 r / min for 40 min, then 20 mmol of DOPO was added and the stirring reaction was continued for 10 min, then the temperature was raised to reflux and stirred for reaction for 10 h, and after the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 5;

[0049] Step S6: Add 10mmol intermediate 5, 40mmol 4-hydroxyphenylboronic acid, 45mmol triethylamine and 120mL anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer and a thermometer, stir and react for 2h at a temperature of 25°C and a stirring rate of 500r / min, then heat to 55°C and continue stirring and reacting for 8h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, then wash with distilled water twice, then place in a vacuum drying oven, and dry at a temperature of 60°C for 8h to obtain a fire-resistant radiation-proof agent.

[0050] Embodiment 2:

[0051] This embodiment is a method for preparing a fire-resistant radiation-proof agent, comprising the following steps:

[0052] Step S1: 10 mmol of p-hydroxybenzaldehyde, 23 mmol of N-chlorosuccinimide and 45 mL of anhydrous tetrahydrofuran 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 550 r / min for 25 min, and then the mixture was heated to 52° C. and the stirring reaction was continued for 18 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation, and then silica gel column chromatography was performed with a mixed solvent prepared by mixing dichloromethane and anhydrous methanol in a volume ratio of 18:1 to obtain intermediate 1;

[0053] Step S2: 0.58 mol of phosphorus oxychloride and 0.1 mol of pentaerythritol were added to a three-necked flask equipped with a stirrer, a thermometer and a nitrogen gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at 82° C. and a stirring rate of 550 r / min for 2.5 h, and then the mixture was heated to 112° C. and continued to stir for 9 h. After the reaction was completed, the reaction product was cooled to room temperature, and then washed with anhydrous ether, benzene and dichloromethane for 4 times in sequence, and then placed in a vacuum drying oven and dried at 62° C. for 4.5 h to obtain intermediate 2;

[0054] Step S3: 20 mmol of intermediate 1, 10 mmol of intermediate 2, 23 mmol of anhydrous potassium carbonate and 70 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at -3 °C and a stirring rate of 550 r / min for 2.5 h, and then the mixture was heated to 28 °C and stirred for 12 h. After the reaction was completed, the reaction product was centrifuged, and the supernatant was added to deionized water, and then vacuum filtered. The filter cake was washed with distilled water for 2.5 times, and then placed in a vacuum drying oven and dried at 62 °C for 9 h to obtain intermediate 3;

[0055] Step S4: 20 mmol of monoethanolamine borate and 70 mL of anhydrous ethanol 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 550 r / min for 45 min. Then, 10 mmol of intermediate 3 was added and the stirring reaction was continued for 12 h. After the reaction was completed, the reaction product was vacuum filtered, and the filter cake was placed in a vacuum drying oven and dried at 62° C. for 12 h to obtain intermediate 4;

[0056] Step S5: 10 mmol of intermediate 4 and 110 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and the mixture was stirred at 48°C and a stirring rate of 550 r / min for 45 min, and then 20 mmol of DOPO was added and the stirring reaction was continued for 12 min, and then the mixture was heated to reflux and stirred for 12 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 intermediate 5;

[0057] Step S6: Add 10mmol intermediate 5, 40mmol 4-hydroxyphenylboronic acid, 48mmol triethylamine and 135mL anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer and a thermometer, stir and react for 2.5h at a temperature of 28°C and a stirring rate of 550r / min, then heat to 58°C and continue stirring and reacting for 9h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, then wash with distilled water 2.5 times, then place in a vacuum drying oven, and dry at a temperature of 62°C for 9h to obtain a fire-resistant radiation-proof agent.

[0058] Embodiment 3:

[0059] This embodiment is a method for preparing a fire-resistant radiation-proof agent, comprising the following steps:

[0060] Step S1: 10 mmol of p-hydroxybenzaldehyde, 25 mmol of N-chlorosuccinimide and 50 mL of anhydrous tetrahydrofuran 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 600 r / min for 30 min, and then the mixture was heated to 55° C. and the stirring reaction was continued for 20 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation, and then silica gel column chromatography was performed with a mixed solvent prepared by mixing dichloromethane and anhydrous methanol in a volume ratio of 20:1 to obtain intermediate 1;

[0061] Step S2: 0.6 mol of phosphorus oxychloride and 0.1 mol of pentaerythritol were added to a three-necked flask equipped with a stirrer, a thermometer and a nitrogen gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at 85° C. and a stirring rate of 600 r / min for 3 h, and then the mixture was heated to 115° C. and stirred for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then washed with anhydrous ether, benzene and dichloromethane for 5 times in sequence, and then placed in a vacuum drying oven and dried at 65° C. for 5 h to obtain intermediate 2;

[0062] Step S3: 20 mmol of intermediate 1, 10 mmol of intermediate 2, 25 mmol of anhydrous potassium carbonate and 80 mL of anhydrous tetrahydrofuran were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 0°C and a stirring rate of 600 r / min for 3 h, and then the mixture was heated to 30°C and the stirring reaction was continued for 15 h. After the reaction was completed, the reaction product was centrifuged, and the supernatant was added to deionized water, and then vacuum filtered. The filter cake was washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at 65°C for 10 h to obtain intermediate 3;

[0063] Step S4: 20 mmol of monoethanolamine borate and 80 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer and a thermometer, and the mixture was stirred at 30° C. and 600 r / min for 50 min. Then, 10 mmol of intermediate 3 was added and the stirring reaction was continued for 15 h. After the reaction was completed, the reaction product was vacuum filtered, and the filter cake was placed in a vacuum drying oven and dried at 65° C. for 15 h to obtain intermediate 4;

[0064] Step S5: 10 mmol of intermediate 4 and 120 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stirred for reaction at a temperature of 50° C. and a stirring rate of 600 r / min for 50 min, then 20 mmol of DOPO was added and the stirring reaction was continued for 15 min, then the temperature was raised to reflux and the stirring reaction was continued for 15 h, and after the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 5;

[0065] Step S6: Add 10mmol intermediate 5, 40mmol 4-hydroxyphenylboronic acid, 50mmol triethylamine and 150mL anhydrous tetrahydrofuran into a three-necked flask equipped with a stirrer and a thermometer, stir and react for 3h at a temperature of 30°C and a stirring rate of 600r / min, then heat to 60°C and continue stirring and reacting for 10h. After the reaction is completed, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, then wash with distilled water 3 times, then place in a vacuum drying oven, and dry at a temperature of 65°C for 10h to obtain a fire-resistant radiation-proof agent.

[0066] Embodiment 4:

[0067] This embodiment is a method for preparing a fire-resistant communication cable for a radiation-resistant nuclear power plant, comprising the following steps:

[0068] Step 1: Weigh 100 parts of polypropylene resin, 25 parts of EPDM rubber, 3 parts of antioxidant DSTP, 1 part of calcium stearate, 4 parts of plasticizer DEHP, 6 parts of boron nitride and 2 parts of the fire-resistant radiation-proof agent from Example 1 according to weight parts, and set aside;

[0069] Step 2: Add polypropylene resin, EPDM rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and fire-resistant radiation-proof agent into a mixer, mix at a temperature of 55° C. for 30 minutes, then heat to 90° C. and continue mixing for 1 hour to obtain a mixture;

[0070] Step 3: Add the mixture into an extruder, and coat it on the outside of the cable body through extrusion to form a cable protective jacket, thereby obtaining the fire-resistant communication cable for the radiation-resistant nuclear power plant.

[0071] Embodiment 5:

[0072] This embodiment is a method for preparing a fire-resistant communication cable for a radiation-resistant nuclear power plant, comprising the following steps:

[0073] Step 1: Weigh 105 parts of polypropylene resin, 30 parts of EPDM rubber, 4.5 parts of antioxidant DSTP, 3 parts of calcium stearate, 7 parts of plasticizer DEHP, 9 parts of boron nitride and 7 parts of the fire-resistant radiation-proof agent from Example 2 according to weight parts, and set aside;

[0074] Step 2: Add polypropylene resin, EPDM rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and fire-resistant radiation-proof agent into a mixer, mix at a temperature of 58° C. for 35 minutes, then heat to 95° C. and continue mixing for 1.2 hours to obtain a mixture;

[0075] Step 3: Add the mixture into an extruder, and coat it on the outside of the cable body through extrusion to form a cable protective jacket, thereby obtaining the fire-resistant communication cable for the radiation-resistant nuclear power plant.

[0076] Embodiment 6:

[0077] This embodiment is a method for preparing a fire-resistant communication cable for a radiation-resistant nuclear power plant, comprising the following steps:

[0078] Step 1: Weigh 110 parts of polypropylene resin, 35 parts of EPDM rubber, 6 parts of antioxidant DSTP, 5 parts of calcium stearate, 10 parts of plasticizer DEHP, 12 parts of boron nitride and 12 parts of the fire-resistant radiation-proof agent from Example 3 according to weight parts, and set aside;

[0079] Step 2: Add polypropylene resin, EPDM rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and fire-resistant radiation-proof agent into a mixer, mix at 60° C. for 40 minutes, then heat to 100° C. and continue mixing for 1.5 hours to obtain a mixture;

[0080] Step 3: Add the mixture into an extruder, and coat it on the outside of the cable body through extrusion to form a cable protective jacket, thereby obtaining the fire-resistant communication cable for the radiation-resistant nuclear power plant.

[0081] Comparative Example 1:

[0082] The difference between Comparative Example 1 and Example 6 is that no fire-resistant radiation-proofing agent is added.

[0083] Comparative Example 2:

[0084] The difference between Comparative Example 2 and Example 6 is that DOPO is used instead of the fire-resistant radiation shielding agent.

[0085] The performance of the radiation-resistant fire-resistant communication cables for nuclear power plants of Examples 4-6 and Comparative Examples 1-2 was tested, and the test results are shown in the following table:

[0086] sample Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Fire rating UL94 V-0 V-0 V-0 V-2 V-1 Limiting oxygen index, % 62 65 67 43 55 Tensile strength, MPa 11.2 11.6 12.1 11.0 11.1 Tensile strength after irradiation, MPa 9.9 10.4 10.9 6.1 7.6

[0087] Among them, the irradiation test 60 The experiment was carried out in a Coγ-ray irradiation source at a temperature of 22°C and a total cumulative dose of 1200 kGy.

[0088] Referring to the data in the above table, according to the comparison between Examples 4-6 and Comparative Examples 1-2, it can be known that the addition of DOPO and fire-resistant radiation-proof agents can significantly improve the fire resistance of fire-resistant communication cables for radiation-resistant nuclear power plants, among which the fire-resistant radiation-proof agents have the best fire retardant effect, and the addition of fire-resistant radiation-proof agents can also significantly improve the radiation resistance of fire-resistant communication cables for radiation-resistant nuclear power plants.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] 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 specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. Fire-resistant communication cable for radiation-resistant nuclear power plants, characterized in that: It includes a cable body and a cable protective jacket wrapped around the cable body; Wherein, the cable protective jacket comprises the following components in parts by weight: 100-110 parts of polypropylene resin, 25-35 parts of EPDM rubber, 3-6 parts of antioxidant DSTP, 1-5 parts of calcium stearate, 4-10 parts of plasticizer DEHP, 6-12 parts of boron nitride and 2-12 parts of fire-resistant and radiation-proof agent; Wherein, the fire-resistant radiation-proof agent is prepared by the following steps: Step S1: adding p-hydroxybenzaldehyde, N-chlorosuccinimide and anhydrous tetrahydrofuran into a three-necked flask and stirring for reaction; after the reaction, cooling the reaction product, and then rotary evaporating it, and then performing silica gel column chromatography with a mixed solvent to obtain intermediate 1; Step S2: adding phosphorus oxychloride and pentaerythritol into a three-necked flask and stirring for reaction, cooling the reaction product after the reaction is completed, and then washing and drying to obtain intermediate 2; Step S3: adding intermediate 1, intermediate 2, anhydrous potassium carbonate and anhydrous tetrahydrofuran into a three-necked flask and stirring for reaction, centrifuging the reaction product after the reaction is completed, adding the supernatant into deionized water, and then vacuum filtering, washing and drying the filter cake to obtain intermediate 3; Step S4: adding monoethanolamine borate and anhydrous ethanol into a three-necked flask and stirring for reaction, then adding intermediate 3 and continuing stirring for reaction, after the reaction is completed, vacuum filtering the reaction product, and drying the filter cake to obtain intermediate 4; Step S5: adding intermediate 4 and N,N-dimethylformamide to a three-necked flask and stirring for reaction, then adding DOPO and continuing stirring for reaction, cooling the reaction product after the reaction is completed, and then rotary evaporating to obtain intermediate 5; Step S6: Add the intermediate 5, 4-hydroxyphenylboronic acid, triethylamine and anhydrous tetrahydrofuran into a three-necked flask and stir for reaction. After the reaction is completed, cool the reaction product, then rotary evaporate it, and then wash and dry it to obtain a fire-resistant radiation shielding agent.

2. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The dosage ratio of the p-hydroxybenzaldehyde, N-chlorosuccinimide and anhydrous tetrahydrofuran in step S1 is 10mmol:22-25mmol:40-50mL, and the mixed solvent is a mixture of dichloromethane and anhydrous methanol in a volume ratio of 15-20:

1.

3. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The usage ratio of the phosphorus oxychloride and pentaerythritol in step S2 is 0.55-0.6 mol:0.1 mol.

4. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The usage ratio of the intermediate 1, intermediate 2, anhydrous potassium carbonate and anhydrous tetrahydrofuran in step S3 is 20 mmol: 10 mmol: 22-25 mmol: 60-80 mL.

5. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The usage ratio of the monoethanolamine borate, anhydrous ethanol and intermediate 3 in step S4 is 20 mmol: 60-80 mL: 10 mmol.

6. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The usage ratio of the intermediate 4, N,N-dimethylformamide and DOPO in step S5 is 10 mmol: 100-120 mL: 20 mmol.

7. The radiation-resistant fire-resistant communication cable for nuclear power plants according to claim 1, characterized in that: The usage ratio of the intermediate 5, 4-hydroxyphenylboronic acid, triethylamine and anhydrous tetrahydrofuran in step S6 is 10 mmol: 40 mmol: 45-50 mmol: 120-150 mL.

8. The method for preparing a radiation-resistant fire-resistant communication cable for a nuclear power plant according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: weigh 100-110 parts of polypropylene resin, 25-35 parts of EPDM rubber, 3-6 parts of antioxidant DSTP, 1-5 parts of calcium stearate, 4-10 parts of plasticizer DEHP, 6-12 parts of boron nitride and 2-12 parts of fire-resistant radiation-proof agent according to weight parts, and set aside; Step 2: Add polypropylene resin, EPDM rubber, antioxidant DSTP, calcium stearate, plasticizer DEHP, boron nitride and fire-resistant radiation-proof agent into a mixer, mix at a temperature of 55-60° C. for 30-40 minutes, then heat to 90-100° C. and continue mixing for 1-1.5 hours to obtain a mixture; Step 3: Add the mixture into an extruder, and coat it on the outside of the cable body through extrusion to form a cable protective jacket, thereby obtaining the fire-resistant communication cable for the radiation-resistant nuclear power plant.

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