A method for producing environmentally friendly flame-retardant cable filling rope

Abstract

The present invention relates to the field of cable manufacturing technology, and discloses a method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps: S1: preparing raw materials; S2: preliminary treatment; S3: mixing and stirring; S4: storage and standing; S5: secondary mixing; S6: foam treatment and molding; S7: coating and molding; S8: drying and curing; S9: cutting and post-processing. In the present invention, by integrating multiple functions such as anti-oxidation, anti-radiation, flame retardant and fire-resistant, the filling material can greatly improve the safety of cables in high temperature and high radiation environments. In key infrastructure such as nuclear power and high-speed rail, cables need to have long life and high stability. This material can effectively extend the service life of cables and reduce safety hazards caused by cable failures. The new filling material has excellent flame retardant and fire-resistant properties, which can effectively prevent the spread of flames when a fire occurs and reduce the damage to cables caused by fire.

Description

Technical Field

[0001] The invention relates to the technical field of cable manufacturing, and in particular to a method for producing an environmentally friendly flame-retardant cable filling rope. Background Art

[0002] At present, the cable industry has become the second largest industry in the machinery industry, second only to the automobile industry. In 2020, its output value has exceeded 150 trillion yuan, and flame-retardant and fire-resistant cables account for about 50% of it. The demand for flame-retardant and fire-resistant cables in 2020 will reach nearly 500 billion yuan, and the annual consumption of the indispensable flame-retardant and fire-resistant cable internal cable core filling rope will reach more than 50,000 tons, and the annual consumption will continue to increase at a rate of about 10%.

[0003] There are many types of filling ropes used for flame retardant and fire resistant cables. The performance of similar domestic flame retardant and fire resistant filling ropes varies, and the stability and environmental protection are poor. At present, the commonly used filling ropes for domestic flame retardant filling ropes are glass fiber filling ropes, rock wool filling ropes, flame retardant polypropylene tear net filling ropes, flame retardant polyester cotton yarn filling ropes, flame retardant cotton yarn filling ropes and ceramic siliconized rubber filling ropes. Among them, only ceramic siliconized rubber filling ropes can achieve good fire resistance, but they are expensive, heavy, have a flame retardant oxygen index of less than 30%, and have poor flame retardant performance. In addition, glass fiber filling ropes, rock wool filling ropes, and flame retardant polypropylene tear net filling ropes have poor environmental protection and poor radiation resistance, and cannot be used in nuclear grade cables. The flame retardant oxygen index of flame retardant polyester cotton yarn filling ropes and flame retardant cotton yarn filling ropes is less than 30%, and the flame retardant performance is poor.

[0004] Therefore, there is currently no multi-performance filling material on the market that combines anti-oxidation, anti-radiation, long life, flame retardancy and fire resistance, making it difficult to meet the long life, high flame retardancy and radiation resistance requirements of China's world-leading nuclear power, high-speed rail and other cables.

[0005] Therefore, we propose an environmentally friendly flame-retardant cable filling rope production method. Summary of the invention

[0006] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a method for producing an environmentally friendly flame-retardant cable filling rope.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme, a method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps:

[0008] S1: Preparation of raw materials: expanded graphite: 5%-8%, polyurethane foam: 15%-18%, silicon nitride powder: 5%-8%, halogen-free flame retardant: 2%-5%, ultra-high molecular weight polyethylene: 10%-13%, long-chain aromatic polyester: 10%-13%, modified ceramic particles: 5%-8%, silicon dioxide nanopowder: 1%, radiation-resistant polymer: 5%-8%, antioxidant: 1%-4%, mildew inhibitor: 1%-4%;

[0009] S2: Preliminary treatment: crushing and screening the expanded graphite, screening the modified ceramic particles, selecting polyurethane foam according to the requirements of foam density and hardness, and directly adding antioxidants and mildew inhibitors as additives;

[0010] S3: Mixing and stirring: Put all the processed raw materials into the mixer and ensure that the raw materials are fully and evenly dispersed according to their different characteristics;

[0011] S4: Storage and standing: The mixed materials are placed in a storage tank and allowed to stand to ensure that all ingredients are fully reacted and stable;

[0012] S5: secondary mixing: stirring the mixture after standing again;

[0013] S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds;

[0014] S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness;

[0015] S8: Drying and curing: Place the formed material in an oven or curing furnace for drying;

[0016] S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

[0017] Preferably, in S2, the expanded graphite is screened to 200-230 mesh, high-purity silicon nitride powder is screened to ensure that its particle size is about 5 microns-8 microns, and the modified ceramic particles are screened to ensure that the particles are 2 microns-5 microns.

[0018] Preferably, in S3, the mixing time is 20-23 hours, and the mixing speed is set at 1500 rpm-1800 rpm.

[0019] Preferably, in S4, the material is placed in a storage tank and left to stand for 12-15 hours.

[0020] Preferably, in S5, the stirring time is 4-6 hours, and the stirring speed is maintained at 1500 rpm-1800 rpm.

[0021] Preferably, in S8, the drying temperature is 50°C-65°C, and the drying time is 8h-10h.

[0022] The present invention provides a method for producing an environmentally friendly flame-retardant cable filling rope. It has the following beneficial effects:

[0023] 1. This is an environmentally friendly flame-retardant cable filling rope production method. By integrating multiple functions such as anti-oxidation, anti-radiation, flame retardancy and fire resistance, the filling material can greatly improve the safety of cables in high temperature and high radiation environments. In key infrastructure such as nuclear power and high-speed rail, cables need to have long life and high stability. This material can effectively extend the service life of cables and reduce safety hazards caused by cable failures.

[0024] 2. This is an environmentally friendly flame-retardant cable filling rope production method. The new filling material has excellent flame retardant and fire-resistant properties, which can effectively prevent the spread of flames when a fire occurs and reduce the damage to the cable caused by the fire. Especially in high-risk environments (such as nuclear power plants, chemical plants, etc.), this flame retardant property is particularly important and can ensure the safety of equipment and personnel to the greatest extent.

[0025] 3. This is a method for producing an environmentally friendly flame-retardant cable filling rope. The material combines radiation resistance and oxidation resistance, allowing the cable to work stably for a long time in a high-radiation environment, especially suitable for nuclear power and aerospace fields. This filling material can effectively prevent high radiation from aging and performance degradation of the cable, ensuring the continuous operation of the cable in extreme environments.

[0026] 4. This environmentally friendly flame-retardant cable filling rope production method uses anti-oxidation filling materials, which can effectively prevent the cable from aging or becoming brittle due to oxidation during long-term use, thereby extending the overall service life of the cable. This is especially important in high-speed rail and other fields that require high reliability, reducing the replacement frequency and maintenance costs of the cable.

[0027] 5. This environmentally friendly flame-retardant cable filling rope production method uses halogen-free environmentally friendly materials and low-toxic and harmless additives, so that the filling material meets the green environmental protection requirements, avoids the release of harmful substances, and reduces environmental pollution. In modern industry, more and more attention is paid to the environmental performance of products. This multifunctional filling material not only meets the technical requirements, but also conforms to the trend of sustainable development. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. 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.

[0029] Embodiment 1: A method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps:

[0030] S1: Preparation of raw materials: expanded graphite: 5%, polyurethane foam: 15%, silicon nitride powder: 5%, halogen-free flame retardant: 2%, ultra-high molecular weight polyethylene: 10%, long-chain aromatic polyester: 10%, modified ceramic particles: 5%, silicon dioxide nanopowder: 1%, radiation-resistant polymer: 5%, antioxidant: 1%, mildew inhibitor: 1%;

[0031] S2: Preliminary treatment: crush and screen the expanded graphite to 200 mesh, screen high-purity silicon nitride powder to ensure that its particle size is about 5 microns, and screen the modified ceramic particles to ensure that the particles are 2 microns, use wet dispersion to treat silicon dioxide nanopowder, select polyurethane foam according to the requirements of foam density and hardness, and directly add antioxidants and mildew inhibitors as additives;

[0032] S3: Mixing and stirring: Put all the processed raw materials into a mixer. According to the different characteristics of the raw materials, the mixing time is 20 hours and the mixing speed is set at 1500 rpm to ensure that the raw materials are fully and evenly dispersed;

[0033] S4: Storage and standing: The mixed materials are placed in a storage tank and left to stand for 12 hours to ensure that all ingredients are fully reacted and stable;

[0034] S5: secondary mixing: stirring the mixture again after standing for 4 hours at a stirring speed of 1500 rpm;

[0035] S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds;

[0036] S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness;

[0037] S8: Drying and curing: Place the formed material in an oven or curing furnace for drying at a temperature of 50°C for 8 hours;

[0038] S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

[0039] Embodiment 2: A method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps:

[0040] S1: Preparation raw materials: expanded graphite: 6%, polyurethane foam: 16%, silicon nitride powder: 6%, halogen-free flame retardant: 3%, ultra-high molecular weight polyethylene: 11%, long-chain aromatic polyester: 11%, modified ceramic particles: 6%, silicon dioxide nanopowder: 2%, radiation-resistant polymer: 6%, antioxidant: 2%, mildew inhibitor: 2%;

[0041] S2: Preliminary treatment: crush and screen the expanded graphite to 210 mesh, screen high-purity silicon nitride powder to ensure that its particle size is about 6 microns, and screen the modified ceramic particles to ensure that the particles are 3 microns, use wet dispersion to treat silicon dioxide nanopowder, select polyurethane foam according to the requirements of foam density and hardness, and directly add antioxidants and mildew inhibitors as additives;

[0042] S3: Mixing and stirring: Put all the processed raw materials into a mixer. According to the different characteristics of the raw materials, the mixing time is 21 hours and the mixing speed is set at 1600 rpm to ensure that the raw materials are fully and evenly dispersed;

[0043] S4: Storage and standing: The mixed materials are placed in a storage tank and left to stand for 13 hours to ensure that all ingredients are fully reacted and stable;

[0044] S5: secondary mixing: stirring the mixture again after standing for 5 hours at a stirring speed of 1600 rpm;

[0045] S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds;

[0046] S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness;

[0047] S8: Drying and curing: Place the formed material in an oven or curing furnace for drying at a temperature of 55°C for 8 hours;

[0048] S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

[0049] Embodiment 3: A method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps:

[0050] S1: Preparation raw materials: expanded graphite: 7%, polyurethane foam: 17%, silicon nitride powder: 7%, halogen-free flame retardant: 4%, ultra-high molecular weight polyethylene: 12%, long-chain aromatic polyester: 12%, modified ceramic particles: 7%, silicon dioxide nanopowder: 3%, radiation-resistant polymer: 7%, antioxidant: 3%, mildew inhibitor: 3%;

[0051] S2: Preliminary treatment: crush and screen the expanded graphite to 220 mesh, screen high-purity silicon nitride powder to ensure that its particle size is about 7 microns, and screen the modified ceramic particles to ensure that the particles are 4 microns, use wet dispersion to treat silicon dioxide nanopowder, select polyurethane foam according to the requirements of foam density and hardness, and directly add antioxidants and mildew inhibitors as additives;

[0052] S3: Mixing and stirring: Put all the processed raw materials into a mixer. According to the different characteristics of the raw materials, the mixing time is 22 hours and the mixing speed is set at 1700 rpm to ensure that the raw materials are fully and evenly dispersed;

[0053] S4: Storage and standing: The mixed materials are placed in a storage tank and left to stand for 14 hours to ensure that all ingredients are fully reacted and stable;

[0054] S5: secondary mixing: stirring the mixture again after standing for 5 hours at a stirring speed of 1700 rpm;

[0055] S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds;

[0056] S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness;

[0057] S8: Drying and curing: Place the formed material in an oven or curing furnace for drying at a temperature of 60°C for 9 hours;

[0058] S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

[0059] Embodiment 4: A method for producing an environmentally friendly flame-retardant cable filling rope, comprising the following steps:

[0060] S1: Preparation raw materials: expanded graphite: 8%, polyurethane foam: 18%, silicon nitride powder: 8%, halogen-free flame retardant: 5%, ultra-high molecular weight polyethylene: 13%, long-chain aromatic polyester: 13%, modified ceramic particles: 8%, silicon dioxide nanopowder: 4%, radiation-resistant polymer: 8%, antioxidant: 4%, mildew inhibitor: 4%;

[0061] S2: Preliminary treatment: crush and screen the expanded graphite to 230 mesh, screen high-purity silicon nitride powder to ensure that its particle size is about 8 microns, and screen the modified ceramic particles to ensure that the particles are 5 microns, use wet dispersion to treat silicon dioxide nanopowder, select polyurethane foam according to the requirements of foam density and hardness, and directly add antioxidants and mildew inhibitors as additives;

[0062] S3: Mixing and stirring: Put all the processed raw materials into a mixer. According to the different characteristics of the raw materials, the mixing time is 23 hours and the mixing speed is set at 1800 rpm to ensure that the raw materials are fully and evenly dispersed;

[0063] S4: Storage and standing: The mixed materials are placed in a storage tank and left to stand for 15 hours to ensure that all ingredients are fully reacted and stable;

[0064] S5: secondary mixing: stirring the mixture again after standing for 6 hours at a stirring speed of 1800 rpm;

[0065] S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds;

[0066] S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness;

[0067] S8: Drying and curing: Place the formed material in an oven or curing furnace for drying at a temperature of 65°C for 10 hours;

[0068] S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

[0069] Silicon nitride powder: select high-purity silicon nitride powder and sieve it to ensure that its particle size (usually between 5-10 microns) meets the requirements to enhance the dispersibility of the powder. Halogen-free flame retardant (phosphate): select environmentally friendly halogen-free flame retardant that meets the flame retardant requirements to ensure its physical and chemical stability. Ultra-high molecular weight polyethylene (UHMWPE): usually granular material, hot melt treatment or dissolution treatment according to production requirements to make it easier to combine with other materials. Long-chain aromatic polyester (such as PBT): select granular PBT material to avoid excessive pyrolysis to maintain its good mechanical properties. Modified ceramic particles: screen ceramic particles of appropriate particle size to ensure adequate dispersion during the mixing process. Silica nanopowder: select high-purity silica nanopowder to improve its dispersibility. Radiation-resistant polymers (such as PET): usually in granular form, which are first dissolved or melted during production to facilitate fusion with other materials. Antioxidant (BHT): Antioxidants usually exist in the form of powder or granules and can be added directly to the mixture to ensure their uniform distribution. Antifungal agents (benzothiazoles): added in the form of powder or granules to ensure their uniform distribution in the mixture to prevent mold growth.

[0070] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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. In addition, in the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and the specification of the present invention.

Claims

1. A method for producing an environmentally friendly flame-retardant cable filling rope, characterized in that: The following steps are involved: S1: Preparation of raw materials: expanded graphite: 5%-8%, polyurethane foam: 15%-18%, silicon nitride powder: 5%-8%, halogen-free flame retardant: 2%-5%, ultra-high molecular weight polyethylene: 10%-13%, long-chain aromatic polyester: 10%-13%, modified ceramic particles: 5%-8%, silicon dioxide nanopowder: 1%, radiation-resistant polymer: 5%-8%, antioxidant: 1%-4%, mildew inhibitor: 1%-4%; S2: Preliminary treatment: crushing and screening the expanded graphite, screening the modified ceramic particles, selecting polyurethane foam according to the requirements of foam density and hardness, and directly adding antioxidants and mildew inhibitors as additives; S3: Mixing and stirring: Put all the processed raw materials into the mixer and ensure that the raw materials are fully and evenly dispersed according to their different characteristics; S4: Storage and standing: The mixed materials are placed in a storage tank and allowed to stand to ensure that all ingredients are fully reacted and stable; S5: secondary mixing: stirring the mixture after standing again; S6: Foam processing and molding: The polyurethane foam can be processed into appropriate foam density and hardness, and then molded together with other raw materials through hot pressing or casting molds; S7: Coating and forming: Feed the mixture into the coating machine for coating to ensure the formation of a coating with uniform thickness; S8: Drying and curing: Place the formed material in an oven or curing furnace for drying; S9: Cutting and post-processing: Cut, split, or perform other post-processing on the cured product, such as surface treatment, coating, etc., to ensure that the product meets the final quality standards.

2. The method for producing an environmentally friendly flame-retardant cable filling rope according to claim 1, characterized in that: In S2, the expanded graphite is screened to 200-230 meshes, high-purity silicon nitride powder is screened to ensure that its particle size is about 5 microns-8 microns, and the modified ceramic particles are screened to ensure that the particles are 2 microns-5 microns.

3. The method for producing an environmentally friendly flame-retardant cable filling rope according to claim 1, characterized in that: In the S3, the mixing time is 20-23 hours, and the mixing speed is set at 1500 rpm-1800 rpm.

4. The method for producing an environmentally friendly flame-retardant cable filling rope according to claim 1, characterized in that: In S4, the material is placed in a storage tank and left to stand for 12-15 hours.

5. The method for producing an environmentally friendly flame-retardant cable filling rope according to claim 1, characterized in that: In S5, the stirring time is 4-6 hours, and the stirring speed is maintained at 1500 rpm-1800 rpm.

6. The method for producing an environmentally friendly flame-retardant cable filling rope according to claim 1, characterized in that: In S8, the drying temperature is 50°C-65°C, and the drying time is 8h-10h.