Computer and instrument cable and preparation method thereof

Abstract

The present application discloses a cable for computers and instruments and a preparation method thereof. The cable for computers and instruments comprises an insulating core and a halogen-free flame retardant layer 1 coated on the outside of a plurality of mutually twisted insulating cores, a shielding layer 1 coated on the outside of the halogen-free flame retardant layer 1, a halogen-free flame retardant layer 2 coated on the outside of the shielding layer 1, a corrugated stainless steel layer coated on the outside of the halogen-free flame retardant layer 2, and a halogen-free flame retardant and anti-rat and ant layer coated on the outside of the corrugated stainless steel layer, and a halogen-free flame retardant material is filled between the halogen-free flame retardant layer 1 and the insulating core; the insulating core comprises a tinned copper conductor, a halogen-free flame retardant layer 3 coated on the outside of a plurality of twisted tinned copper conductors, and a shielding layer 2 coated on the outside of the halogen-free flame retardant layer 3; the tinned copper conductor comprises a tinned copper conductor core, a fire-resistant layer coated on the outside of the tinned copper conductor core, and a halogen-free flame retardant layer 4 coated on the outside of the fire-resistant layer. The cable of the present application has the advantages of high flame retardancy and anti-rat and ant resistance. It is used in harsh environments, and the surface is not easy to break, ensuring the normal use of computers and instruments.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a computer and instrument cable and a preparation method thereof. Background Art

[0002] Computer and instrument cables are wires that transmit signals and electricity. They are widely used in computer systems or automation devices for detection and control in power generation, metallurgy, petroleum, chemical industry, light industry and other departments. This type of cable is usually a rope-like cable made of one or more twisted wires, with a cable core in the middle and multiple layers of protective layer wrapped around the outside, and then used in various fields.

[0003] The computer and instrument cables currently on the market include high-temperature resistant computer and instrument cables, flame-retardant computer and instrument cables, low-temperature resistant computer and instrument cables, fire-resistant computer and instrument cables, acid and alkali resistant and other chemically corrosive computer and instrument cables, etc. The main disadvantage of these computer and instrument cables is that their safety performance is monotonous and they cannot meet the needs of two or more safety performances.

[0004] Existing computer and instrument cables are often easily bent and pulled in harsh environments, which can easily cause the cable surface to rupture over time, making the instrument unable to function normally. Summary of the Invention

[0005] In order to improve the problem that the surface of computer and instrument cables is easily broken, the present application provides a computer and instrument cable and a preparation method thereof.

[0006] In the first aspect, the present application provides a computer and instrument cable, which adopts the following technical solution:

[0007] A computer and instrument cable, comprising an insulating core and a first halogen-free flame retardant layer coated on a plurality of mutually twisted insulating cores, a first shielding layer coated on the first halogen-free flame retardant layer, a second halogen-free flame retardant layer coated on the first shielding layer, a corrugated stainless steel layer coated on the second halogen-free flame retardant layer, and a halogen-free flame retardant, rat-proof, and ant-proof layer coated on the corrugated stainless steel layer, wherein a halogen-free flame retardant material is filled between the first halogen-free flame retardant layer and the insulating core.

[0008] The insulated wire core comprises a tinned copper conductor, a third halogen-free flame retardant layer coated on the outside of a plurality of twisted tinned copper conductors, and a second shielding layer coated on the outside of the third halogen-free flame retardant layer;

[0009] The tinned copper wire comprises a tinned copper wire core, a fire-resistant layer coated on the outside of the tinned copper wire core, and a halogen-free flame-retardant layer coated on the outside of the fire-resistant layer.

[0010] By adopting the above technical scheme, a halogen-free flame retardant layer is used to cover the insulating core, and the halogen-free flame retardant layer has the functions of heat insulation, oxygen isolation, and preventing combustible gas from escaping to the outside, thereby achieving the flame retardant purpose; the shielding layer covers the halogen-free flame retardant layer, and has the function of shielding the magnetic field inside the cable to prevent the small wires from being attracted by the magnetic field and short-circuiting, thereby reducing heat dissipation, avoiding melting of the insulation layer, and reducing the risk of fire; the halogen-free flame retardant layer two further covers the shielding layer one, and plays the role of oxygen isolation and flame retardancy; the corrugated stainless steel layer covers the halogen-free flame retardant layer two, and has the advantages of durability, high temperature resistance, corrosion resistance, and wear resistance; the halogen-free flame retardant and anti-rat and ant layer covers the corrugated stainless steel layer, and has the advantages of high flame retardancy, UV resistance, high temperature resistance, oil resistance, fire and explosion resistance, corrosion resistance, anti-rat and ant resistance, and moisture resistance, so that the cable can be used in harsh environments, and the skin is not easy to break, ensuring the normal use of computers and instruments.

[0011] Halogen-free flame retardant material also has the functions of flame retardancy, smoke suppression and filling, which can inhibit chain reaction, prevent the spread of flame and reduce the burning speed; the halogen-free flame retardant layer three and the shielding layer two on the outside of the insulating core have the functions of shielding electromagnetic interference, flame retardancy and smoke suppression; the outside of the tinned copper conductor core is covered with a fire-resistant layer, which enables the cable to withstand a certain period of combustion in the event of a fire, and buy more "golden time" for people to escape. The halogen-free flame retardant layer four cooperates with the fire-resistant layer to further play the role of flame retardancy and oxygen isolation, and has good mechanical properties, thereby extending the service life of the cable.

[0012] Preferably, the halogen-free flame retardant layer one, the halogen-free flame retardant layer two, the halogen-free flame retardant layer three and the halogen-free flame retardant layer four all include the following components in parts by weight: 60-70 parts of ethylene-vinyl acetate copolymer, 6-10 parts of dicumyl peroxide, 35-45 parts of modified glass fiber, 5-8 parts of silicone masterbatch, 30-60 parts of white carbon black, 90-100 parts of aluminum hydroxide flame retardant, 1-2 parts of dilauryl thiodipropionate, and 0.5-1 part of polyethylene wax.

[0013] By adopting the above technical solution, ethylene-vinyl acetate copolymer has good chemical stability, aging resistance, and ozone resistance. Dicumyl peroxide is used as a cross-linking agent, which not only has excellent insulation and processing properties, but also can improve its heat resistance and adjust the heat resistance and weather resistance of the system; the modified glass fiber has excellent insulation, heat resistance, corrosion resistance and high mechanical strength, improves the heat resistance and heat deformation temperature of the resistance system, and has a fireproof effect. In combination with ethylene-vinyl acetate copolymer and white carbon black, the mechanical properties of the system can be improved; the silicone masterbatch has good processing properties, improves the wear resistance and scratch resistance of the system, and improves High system fluidity can improve the compatibility of modified glass fiber with other components of the system; white carbon black has super strong adhesion, tear resistance, heat resistance and anti-aging properties, which can improve the mechanical properties of the system. At the same time, combined with other components, it can not only improve the flame retardant properties of the system, but also improve the mechanical properties of the system; aluminum hydroxide flame retardant has the advantages of high flame retardant efficiency, low smoke and harmlessness; dilauryl thiodipropionate has good antioxidant properties and can improve the anti-aging properties of the system; polyethylene wax has good lubricity, which makes the components in the system mix evenly, and makes the system have good lubricity and processability.

[0014] Preferably, the method for preparing the modified glass fiber comprises the following steps:

[0015] (1) placing the glass fiber in a sodium hydroxide solution, soaking for 30-40 minutes, washing with water, and then dispersing in a titanate coupling agent to obtain a pretreated glass fiber;

[0016] (2) dispersing the pretreated glass fiber obtained in step (1) in acetic acid, adding lignin, stirring at a temperature of 60-65° C. for 1-2 h, adding chitosan, continuing to stir, and setting aside;

[0017] (3) Mixing the glass fiber obtained in step (2) with epoxy resin, stirring at a temperature of 90-95° C. for 30-35 minutes to obtain modified glass fiber.

[0018] By adopting the above technical solution, the glass fiber is eroded to a certain extent by a sodium hydroxide solution, so that the surface of the glass fiber becomes rough and porous, and then a titanate coupling agent is added to enhance the reaction activity of the surface of the glass fiber; lignin has strong impact strength and good thermal stability, and can be loaded on the surface of the glass fiber, thereby increasing the mechanical properties of the glass fiber; chitosan has good adhesion and film-forming properties, and can coat the glass fiber, so that the lignin and the glass fiber are more tightly bonded, thereby improving the flame retardancy and mechanical properties of the glass fiber; epoxy resin has better mechanical properties, electrical insulation, chemical resistance, heat resistance and adhesion properties, and is mixed with glass fiber to increase the rigidity and toughness of the glass fiber, further improving the mechanical properties and other comprehensive properties of the material fiber.

[0019] Preferably, the mass ratio of the glass fiber, lignin and chitosan is 1:0.4-0.6:0.2-0.3.

[0020] By adopting the above technical solution, the mass ratio of glass fiber, lignin and chitosan is further limited within a certain range, and modified glass fiber with good flame retardancy and excellent mechanical properties is obtained. Lignin is loaded on the surface of the glass fiber, and chitosan coats the glass fiber, which increases the adhesion between the glass fiber and lignin, thereby improving the corresponding performance of the glass fiber.

[0021] Preferably, the shielding layer 1 and the shielding layer 2 are both aluminum-plastic composite tapes.

[0022] By adopting the above technical solution, a polyester film layer is attached to the surface of the aluminum-plastic composite tape, which can block contact with foreign objects, has high safety and strong high-temperature insulation ability, and can also effectively isolate current and prevent leakage, breakdown and short circuit phenomena, thereby improving the safety of the cable.

[0023] Preferably, the halogen-free flame-retardant rat and ant-proof layer comprises the following components in parts by weight: 35-45 parts of polyolefin, 55-65 parts of silicone rubber, 15-25 parts of polyurethane rubber, 20-30 parts of modified graphene, 80-100 parts of magnesium hydroxide flame retardant, 20-30 parts of anti-termite masterbatch, 10-22 parts of silicon nitride powder and 4-8 parts of silicone masterbatch.

[0024] By adopting the above technical solution, polyolefin has a low relative density, good chemical resistance, good water resistance, good mechanical strength and electrical insulation properties, silicone rubber has fire resistance, water resistance, moisture resistance, shock resistance, impact resistance, temperature shock resistance and chemical corrosion resistance; polyurethane rubber has the advantages of good mechanical properties, high hardness, high elasticity and high wear resistance; modified graphene has good mechanical properties and puncture resistance, which can improve the mechanical strength and tear resistance of the halogen-free flame-retardant and anti-rat and ant layer; magnesium hydroxide flame retardant has good flame retardant properties, improving the flame retardancy of the system; the anti-termite masterbatch is a repellent agent that does not kill termites, but instead attracts them to stay away from the odor, thereby protecting the cable from damage by termites; silicon nitride powder is resistant to decomposition and high-temperature oxidation, has high hardness, good wear resistance, good impact resistance, and has a self-lubricating effect, improving the mechanical properties of the system and ensuring uniform mixing of the components; the silicone masterbatch has good fluidity, improves the dispersion properties of the components of the system, and has good stability and non-migration.

[0025] Preferably, the method for preparing the modified graphene comprises the following steps:

[0026] (1) Graphene was dispersed in anhydrous ethanol solution, ultrasonicated for 1-3 hours, then nano-nickel oxide particles were added, stirred for 30-60 minutes, ultrasonicated for 3-5 hours, filtered, dried, and set aside;

[0027] (2) Dispersing the natural zeolite in a nitric acid solution, stirring for 1-3 hours, washing with water, and then dispersing it in deionized water, adding carbon fiber, stirring for 3-6 hours, adding the graphene treated in step (1), stirring evenly at a temperature of 200-250° C., filtering, and obtaining modified graphene.

[0028] By adopting the above technical solution, graphene has good mechanical properties, and the nano-nickel oxide particles have a large specific surface area, with the advantages of deodorization, sterilization, strong toughness, and extended aging time. The nano-nickel oxide particles can be loaded on the surface of graphene, thereby improving the corresponding properties of graphene.

[0029] Natural zeolite has the advantages of high temperature resistance and non-flammability. The nitric acid solution erodes the natural zeolite to a certain extent, thereby increasing the specific surface area of ​​the natural zeolite. The carbon has good mechanical properties and antibacterial properties. The carbon fiber is loaded on the surface of the natural zeolite, thereby increasing the specific surface area of ​​the natural zeolite. The graphene treated in step (1) is added, and the treated graphene is loaded on the natural graphite loaded with the carbon fiber. At the same time, the carbon fiber can be loaded on the surface of the graphene, thereby forming a network structure between the graphene, the carbon fiber and the natural zeolite, thereby improving the mechanical properties and flame retardant properties of the graphene.

[0030] Preferably, the mass ratio of graphene, natural zeolite and carbon fiber treated in step (1) is 0.1-0.3g:1mg:0.4-0.6g.

[0031] By adopting the above technical solution, the mass ratio of the graphene, natural zeolite and loofah fiber treated in step (1) is further limited, so that the modified graphene has better mechanical properties and flame retardant properties, the graphene is loaded on the surface of the natural zeolite, and the carbon fiber is loaded on the surface of the graphene, thereby forming a network structure among the graphene, thereby improving the corresponding properties of the graphene.

[0032] Preferably, the refractory layer is a mica tape.

[0033] By adopting the above technical solution, the mica tape has good high temperature resistance and combustion resistance, and has good flexibility under normal conditions. It is suitable for use as the main fire-resistant insulation layer in various fire-resistant cables. When encountering open flames, there is basically no volatilization of harmful smoke, and the safety performance is high.

[0034] In a second aspect, the present application provides a method for preparing a computer and instrument cable, comprising the following steps: S1, drawing and annealing a tinned copper conductor core, and wrapping a fire-resistant layer around the tinned copper conductor core; weighing components of a fourth halogen-free flame-retardant layer, stirring, melt-extruding, and pressing to form a fourth halogen-free flame-retardant layer, and wrapping the fourth halogen-free flame-retardant layer around the fire-resistant layer to obtain a tinned copper conductor;

[0035] S2. Extrusion and wrapping of the halogen-free flame retardant layer 3: Weigh the components of the halogen-free flame retardant layer 3 by weight, stir for 30-40 minutes, melt-extrude, and press to form the halogen-free flame retardant layer 3 at a temperature of 270-280°C, a pressure of 16-18 MPa, and a time of 10-20 seconds. Press to form the halogen-free flame retardant layer 3, twist a plurality of tinned copper wires together, and wrap the halogen-free flame retardant layer 3 around the twisted tinned copper wires. S3. Wrapping of the shielding layer 2: Wrap the shielding layer 2 around the halogen-free flame retardant layer 3 to obtain an insulated wire core.

[0036] S4. Extrusion and wrapping of the halogen-free flame retardant layer 1: Weigh the components of the halogen-free flame retardant layer 1, stir, melt-extrude, and press to form the halogen-free flame retardant layer 1, twist a plurality of insulated wire cores together, and wrap the halogen-free flame retardant layer 1 around the twisted insulated wire cores; mix the components of the halogen-free flame retardant material, stir, and set aside, and fill the prepared halogen-free flame retardant material between the halogen-free flame retardant layer 1 and the insulated wire cores;

[0037] Wrapping the shielding layer one on the halogen-free flame retardant layer one; stirring the components of the halogen-free flame retardant layer two, melt-extruding, and pressing to form the halogen-free flame retardant layer two, and wrapping the halogen-free flame retardant layer two on the halogen-free flame retardant layer one; wrapping the corrugated stainless steel layer on the halogen-free flame retardant layer two, stirring the components of the halogen-free flame retardant, rat-proof and ant-proof layer, melt-extruded, and pressing to form the halogen-free flame retardant, rat-proof and ant-proof layer, and wrapping the halogen-free flame retardant, rat-proof and ant-proof layer on the corrugated stainless steel layer to obtain the product.

[0038] By adopting the above technical solution, the cable prepared by the above method has good mechanical properties and flame retardant properties, is simple to prepare, and has easy operation steps, thereby obtaining a cable with good comprehensive performance.

[0039] In summary, this application has the following beneficial effects:

[0040] This application utilizes a halogen-free flame-retardant layer (1) to coat the insulated core. This layer provides heat and oxygen insulation, and prevents the escape of combustible gases, thereby achieving flame retardancy. A shielding layer (1) coats the halogen-free flame-retardant layer (1), shielding the cable's internal magnetic field and preventing short circuits caused by the attraction of the magnetic field to small conductors. This reduces heat dissipation, prevents the insulation layer from melting, and reduces the risk of fire. A halogen-free flame-retardant layer (2) further coats the shielding layer (1), providing oxygen isolation and flame retardancy. A corrugated stainless steel layer coats the halogen-free flame-retardant layer (2), offering durability, high-temperature resistance, corrosion resistance, and abrasion resistance. A halogen-free flame-retardant, rat-ant-proof layer coats the corrugated stainless steel layer, offering high flame retardancy, UV resistance, high-temperature resistance, oil resistance, fire and explosion resistance, corrosion resistance, rat-ant resistance, and moisture resistance. This ensures that the cable's surface is not susceptible to cracking when used in harsh environments, ensuring the normal use of computers and instruments.

[0041] 2. The halogen-free flame retardant material in this application also has the functions of flame retardancy, smoke suppression and filling, which can inhibit chain reaction, prevent the spread of flame and reduce the burning speed; the halogen-free flame retardant layer three and the shielding layer two on the outside of the insulating core have the functions of shielding electromagnetic interference, flame retardancy and smoke suppression; the outside of the tinned copper conductor core is coated with a fire-resistant layer, which enables the cable to withstand a certain period of burning when a fire occurs, and buys more "golden time" for people to escape. The halogen-free flame retardant layer four cooperates with the fire-resistant layer to further play the role of flame retardancy and oxygen isolation, and has good mechanical properties, thereby extending the service life of the cable.

[0042] 3. The ethylene-vinyl acetate copolymer in this application has good chemical stability, aging resistance, and ozone resistance. Dicumyl peroxide is used as a cross-linking agent, which not only has excellent insulation and processing properties, but also can improve its heat resistance and adjust the heat resistance and weather resistance of the system; the modified glass fiber has excellent insulation, heat resistance, corrosion resistance and high mechanical strength, improves the heat resistance and heat deformation temperature of the resistance system, and has a fireproof effect. Combined with ethylene-vinyl acetate copolymer and white carbon black, it can improve the mechanical properties of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of this application.

[0044] In the figure: 1. Insulated wire core; 11. Tinned copper wire; 111. Tinned copper wire core; 112. Fire-resistant layer; 113. Halogen-free flame retardant layer four; 12. Halogen-free flame retardant layer three; 13. Shielding layer two; 2. Halogen-free flame retardant layer one; 21. Halogen-free flame retardant material; 3. Shielding layer one; 4. Halogen-free flame retardant layer two; 5. Corrugated stainless steel layer; 6. Halogen-free flame retardant, rat and ant proof layer. DETAILED DESCRIPTION

[0045] The present application is further described in detail below with reference to the embodiments.

[0046] The raw materials used in the examples and comparative examples can all be obtained commercially. Among them, the halogen-free flame retardant is composed of a synergist and a phosphorus-nitrogen flame retardant in a mass ratio of 1:3; the synergist is 1.2 kg PPO flame retardant, and the phosphorus-nitrogen flame retardant is selected from Klein OP-930; the anti-termite masterbatch is FYJ-01 purchased from Shenzhen Heyan Yuese Plastic Pigment Additive Co., Ltd.

[0047] Preparation example of modified glass fiber

[0048] Preparation Example 1-1

[0049] The preparation method of modified glass fiber comprises the following steps:

[0050] (1) 1.5 kg of glass fiber was placed in 3 L of 15% sodium hydroxide solution, soaked for 35 min, washed with water, and then dispersed in 2 L of titanate coupling agent to obtain pretreated glass fiber;

[0051] (2) The pretreated glass fiber obtained in step (1) was dispersed in 2 L of 10% acetic acid, lignin was added, and the mixture was stirred at 65° C. for 2 h. Chitosan was added and the mixture was stirred for 3 h.

[0052] (3) The glass fiber obtained in step (2) was mixed with 0.2 kg of epoxy resin and stirred at 90° C. for 35 min to obtain modified glass fiber; wherein the mass ratio of glass fiber, lignin and chitosan was 1:0.4:0.3.

[0053] Preparation Example 1-2

[0054] The difference from Preparation Example 1-1 is that step (1) is not performed.

[0055] Preparation Examples 1-3

[0056] The difference from Preparation Example 1-1 is that in step (2), no lignin is added.

[0057] Preparation Examples 1-4

[0058] The difference from Preparation Example 1-1 is that chitosan is not added in step (2).

[0059] Preparation Examples 1-5

[0060] The difference from Preparation Example 1-1 is that in step (3), no epoxy resin is added.

[0061] Preparation Examples 1-6

[0062] The difference from Preparation Example 1-1 is that the mass ratio of glass fiber, lignin and chitosan is 1:0.6:0.2.

[0063] Preparation Examples 1-7

[0064] The difference from Preparation Example 1-1 is that the mass ratio of glass fiber, lignin and chitosan is 1:0.9:0.1.

[0065] Preparation example of modified graphene

[0066] Preparation Example 2-1

[0067] The preparation method of modified graphene comprises the following steps:

[0068] (1) 0.5 g of graphene was dispersed in 2 L of anhydrous ethanol solution, ultrasonicated for 3 h, then 0.5 kg of nano-nickel oxide particles were added, stirred for 50 min, ultrasonicated for another 4 h, filtered, dried, and set aside;

[0069] (2) Dispersing the natural zeolite in 2 L of 25% nitric acid solution, stirring for 2 h, washing with water, and then dispersing it in 3 L of deionized water, adding carbon fiber, stirring for 4 h, adding the graphene treated in step (1), stirring evenly at a temperature of 250 ° C, filtering, and obtaining modified graphene; wherein the mass ratio of the graphene treated in step (1), the natural zeolite, and the carbon fiber is 0.1 g:1 mg:0.6 g.

[0070] Preparation Example 2-2

[0071] The difference from Preparation Example 2-1 is that in step (1), no nano nickel oxide particles are added.

[0072] Preparation Example 2-3

[0073] The difference from Preparation Example 2-1 is that in step (2), no natural zeolite is added.

[0074] Preparation Example 2-4

[0075] The difference from Preparation Example 2-1 is that in step (2), no carbon fiber is added.

[0076] Preparation Example 2-5

[0077] The difference from Preparation Example 2-1 is that the mass ratio of graphene, natural zeolite and carbon fiber treated in step (1) is 0.3g:1mg:0.4g.

[0078] Preparation Example 2-6

[0079] The difference from Preparation Example 2-1 is that the mass ratio of graphene, natural zeolite and carbon fiber treated in step (1) is 0.5g:1mg:0.1g.

[0080] Example

[0081] Example 1

[0082] A computer and instrument cable, comprising an insulating core 1 and a halogen-free flame-retardant layer 2 coated on a plurality of mutually twisted insulating cores 1, a shielding layer 3 coated on the halogen-free flame-retardant layer 2, a halogen-free flame-retardant layer 4 coated on the shielding layer 3, a corrugated stainless steel layer 5 coated on the halogen-free flame-retardant layer 4, and a halogen-free flame-retardant, rat-proof, and ant-proof layer 6 coated on the corrugated stainless steel layer 5. A halogen-free flame-retardant material 21 is filled between the halogen-free flame-retardant layer 2 and the insulating core 1.

[0083] The insulated wire core 1 comprises a tinned copper conductor 11, a halogen-free flame retardant layer 3 12 wrapped around a plurality of twisted tinned copper conductors 11, and a shielding layer 2 13 wrapped around the halogen-free flame retardant layer 3 12;

[0084] The tinned copper wire 11 includes a tinned copper wire core 111, a fire-resistant layer 112 coated on the outside of the tinned copper wire core 111, and a halogen-free flame retardant layer 113 coated on the outside of the fire-resistant layer 112.

[0085] The halogen-free flame retardant layer 1 2, the halogen-free flame retardant layer 2 4, the halogen-free flame retardant layer 3 12 and the halogen-free flame retardant layer 4 113 all include the following components by weight: 60 kg of ethylene-vinyl acetate copolymer, 6 kg of diisopropyl benzene peroxide, 35 kg of modified glass fiber, 5 kg of silicone masterbatch, 30 kg of white carbon black, 90 kg of aluminum hydroxide flame retardant, 1 kg of dilauryl thiodipropionate, and 0.5 kg of polyethylene wax.

[0086] The shielding layer 1 3 and the shielding layer 2 13 are both aluminum-plastic composite tapes.

[0087] The halogen-free flame-retardant rat- and ant-proof layer 6 includes the following components by weight: 35 kg of polyolefin, 65 kg of silicone rubber, 15 kg of polyurethane rubber, 20 kg of modified graphene, 100 kg of magnesium hydroxide flame retardant, 20 kg of anti-termite masterbatch, 10 kg of silicon nitride powder and 4 kg of silicone masterbatch.

[0088] The fire-resistant layer 112 is a mica tape.

[0089] The method for preparing the above-mentioned computer and instrument cable comprises the following steps:

[0090] S1. Drawing and annealing the tinned copper conductor core 111, and wrapping the refractory layer 112 around the tinned copper conductor core 111; weighing the components of the halogen-free flame retardant layer 113, stirring, melt-extruding, and pressing to form the halogen-free flame retardant layer 113; wrapping the halogen-free flame retardant layer 113 around the refractory layer 112 to obtain the tinned copper conductor 11; wherein the diameter of the drawn tinned copper conductor core 111 is 0.04 mm; placing the tinned copper conductor core 111 in an annealing furnace, controlling the furnace temperature at 550° C., and then passing the tinned copper conductor core 111 through cooling water at 20° C.;

[0091] S2. Extrusion and wrapping of the halogen-free flame retardant layer 12: Weigh the components of the halogen-free flame retardant layer 12 by weight, stir for 35 minutes, melt-extrude, and press-form at a temperature of 280° C., a pressure of 16 MPa, and a time of 15 seconds to form the halogen-free flame retardant layer 12. Twist a plurality of tinned copper wires 11 together, and wrap the halogen-free flame retardant layer 12 around the twisted tinned copper wires 11.

[0092] S3, wrapping the second shielding layer 13: Wrap the second shielding layer 13 on the third halogen-free flame retardant layer 12 to obtain the insulated core 1;

[0093] S4. Extrusion and wrapping of halogen-free flame retardant layer 2: weigh the components of halogen-free flame retardant layer 2, stir, melt extrude and press to form, press at a temperature of 270°C, a pressure of 16 MPa and a time of 20 s, press out halogen-free flame retardant layer 2, twist multiple insulated cores 1 together, wrap halogen-free flame retardant layer 2 around the twisted insulated cores 1; mix the components of halogen-free flame retardant material 21, stir and set aside, fill the space between halogen-free flame retardant layer 2 and insulated core 1 with the prepared halogen-free flame retardant material 21; wrap shielding layer 3 longitudinally around halogen-free flame retardant layer 2; wrap halogen-free flame retardant layer 2 with shielding layer 3; The components of the flame-retardant layer 2 4 are stirred, melt-extruded, and pressed into shape at a pressing temperature of 270° C., a pressure of 18 MPa, and a time of 10 seconds to press out the halogen-free flame-retardant layer 2 4, which is then wrapped around the halogen-free flame-retardant layer 1 2; the corrugated stainless steel layer 5 is wrapped around the halogen-free flame-retardant layer 2 4, the components of the halogen-free flame-retardant, rat-proof, and ant-proof layer 6 are stirred, melt-extruded, and pressed into shape at a pressing temperature of 280° C., a pressure of 18 MPa, and a time of 20 seconds to press out the halogen-free flame-retardant, rat-proof, and ant-proof layer 6, which is then wrapped around the corrugated stainless steel layer 5 to obtain the product.

[0094] The modified glass fiber was prepared using Preparation Example 1-1; the modified graphene was prepared using Preparation Example 2-1.

[0095] Example 2

[0096] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Example 1-2.

[0097] Example 3

[0098] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Examples 1-3.

[0099] Example 4

[0100] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Examples 1-4.

[0101] Example 5

[0102] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Examples 1-5.

[0103] Example 6

[0104] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Examples 1-6.

[0105] Example 7

[0106] A cable for computers and instruments, which differs from Example 1 in that the modified glass fiber is prepared using Preparation Examples 1-7.

[0107] Example 8

[0108] A cable for computers and instruments, which differs from Example 1 in that the modified graphene is prepared using Preparation Example 2-2.

[0109] Example 9

[0110] A cable for computers and instruments, which differs from Example 1 in that the modified graphene is prepared using Preparation Example 2-3.

[0111] Example 10

[0112] A cable for computers and instruments, which differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-4.

[0113] Example 11

[0114] A cable for computers and instruments, which differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-5.

[0115] Example 12

[0116] A cable for computers and instruments, which differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-6.

[0117] Example 13

[0118] A computer and instrument cable, which differs from Example 1 in that the halogen-free flame retardant layer 1 2, the halogen-free flame retardant layer 2 4, the halogen-free flame retardant layer 3 12 and the halogen-free flame retardant layer 4 113 all include the following components by weight: 70 kg of ethylene-vinyl acetate copolymer, 10 kg of dicumyl peroxide, 45 kg of modified glass fiber, 8 kg of silicone masterbatch, 60 kg of white carbon black, 100 kg of aluminum hydroxide flame retardant, 2 kg of dilauryl thiodipropionate, and 1 kg of polyethylene wax.

[0119] The halogen-free flame-retardant rat and ant-proof layer 6 includes the following components by weight: 45 kg of polyolefin, 55 kg of silicone rubber, 25 kg of polyurethane rubber, 30 kg of modified graphene, 80 kg of magnesium hydroxide flame retardant, 30 kg of anti-termite masterbatch, 22 kg of silicon nitride powder, and 8 kg of silicone masterbatch.

[0120] Example 14

[0121] A computer and instrument cable, which differs from Example 1 in that the halogen-free flame retardant layer 1 2, the halogen-free flame retardant layer 2 4, the halogen-free flame retardant layer 3 12 and the halogen-free flame retardant layer 4 113 all include the following components by weight: 75 kg of ethylene-vinyl acetate copolymer, 3 kg of diisopropyl benzene peroxide, 55 kg of modified glass fiber, 19 kg of silicone masterbatch, 20 kg of white carbon black, 70 kg of aluminum hydroxide flame retardant, 5 kg of dilauryl thiodipropionate, and 3 kg of polyethylene wax.

[0122] The halogen-free flame-retardant rat and ant-proof layer 6 includes the following components by weight: 25 kg of polyolefin, 45 kg of silicone rubber, 10 kg of polyurethane rubber, 10 kg of modified graphene, 70 kg of magnesium hydroxide flame retardant, 10 kg of anti-termite masterbatch, 26 kg of silicon nitride powder, and 2 kg of silicone masterbatch.

[0123] Example 15

[0124] A computer and instrument cable differs from Example 1 in that an equal amount of glass fiber is used instead of the modified glass fiber.

[0125] Example 16

[0126] A computer and instrument cable is different from Example 1 in that an equal amount of graphene is used instead of modified graphene.

[0127] Comparative Example

[0128] Comparative Example 1

[0129] A cable for computers and instruments, which differs from Example 1 in that the tinned copper conductor 11 is a tinned copper conductor core 111 and does not include a fire-resistant layer 112 and a halogen-free flame retardant layer 113.

[0130] Comparative Example 2

[0131] A computer and instrument cable is different from the embodiment 1 in that the insulated core 1 includes a tinned copper conductor 11 and does not include a third halogen-free flame retardant layer 12 and a second shielding layer 13.

[0132] Performance testing

[0133] The computer and instrument cables prepared in Examples 1-16 and Comparative Examples 1-2 were subjected to performance tests.

[0134] Test the mechanical properties of the cable in accordance with JBT10707-2007;

[0135] Flame retardant performance test method: Place an 18 cm long cable vertically and use a laboratory blowtorch with a flame height of 120 mm and a heat power of 450 W to burn for 20 seconds, then stop for 20 seconds. Repeat this process 8 times. Observe the residual flame burning time and calculate the degree of burn loss based on the mass of the cable after the flame is extinguished. Degree of burn loss = (mass before burn - mass after burn) / mass before burn × 100%. The results are shown in Table 1.

[0136] Table 1 Performance test results of various embodiments and comparative examples

[0137]

[0138] As can be seen from Table 1, the burning time of the computer and instrument cables prepared in Examples 1, 6, 11, and 13 of the present application is 10s, the burning degree is 2.9%, the oxygen index is 49, the toxicity index is 0.65, the tensile strength is 35.5MPa, and the elongation at break is 198%, indicating that the computer and instrument cables prepared in the present application have the advantages of high flame retardancy, UV resistance, high temperature resistance, oil resistance, fire and explosion resistance, corrosion resistance, rat and ant resistance, and moisture resistance, so that the cables can be used in harsh environments without the skin being easily broken, thereby ensuring the normal use of computers and instruments.

[0139] In the preparation method of the modified glass fiber of Example 2, step (1) is not performed. As can be seen from Table 1, the burning time is 13 s, the burning degree is 5.3%, the oxygen index is 45, the toxicity index is 0.84, the tensile strength is 32.1 MPa, and the elongation at break is 187%, indicating that the glass fiber is eroded to a certain extent by the sodium hydroxide solution, making the surface of the glass fiber rough and porous. Then, the titanate coupling agent is added to enhance the reactivity of the glass fiber surface, which is helpful for the subsequent treatment of the glass fiber surface.

[0140] In the preparation method of the modified glass fiber of Example 3, no lignin is added. As can be seen from Table 1, the burning time is 16 s, the burning degree is 8.5%, the oxygen index is 40, the toxicity index is 0.98, the tensile strength is 28.4 MPa, and the elongation at break is 174%, indicating that lignin has strong impact strength and good thermal stability, can be loaded on the surface of the glass fiber, and increases the mechanical properties of the glass fiber; in the preparation method of the modified glass fiber of Example 4, no chitosan is added. As can be seen from Table 1, the burning time is 14 s, the burning degree is 5.6%, the oxygen index is 44, the toxicity index is 0.86, the tensile strength is 31.1 MPa, and the elongation at break is 180%, indicating that chitosan has good adhesion and film-forming properties, can coat the glass fiber, so that the lignin and the glass fiber are more tightly bonded, thereby improving the flame retardancy and mechanical properties of the glass fiber.

[0141] In the preparation method of the modified glass fiber in Example 5, epoxy resin is not added. As can be seen from Table 1, the burning time, burning degree, oxygen index, toxicity index, tensile strength and elongation at break of the cable all deteriorate to varying degrees, indicating that epoxy resin has better mechanical properties, electrical insulation, chemical resistance, heat resistance and bonding properties. Mixing with glass fiber is beneficial to increase the rigidity and toughness of the glass fiber, and further improve the comprehensive properties of the material fiber such as mechanical properties.

[0142] Example 7 changes the mass ratio of glass fiber, lignin and chitosan. It can be seen from Table 1 that the burning time, burning degree, oxygen index, toxicity index, tensile strength and elongation at break of the cable are better than those of Examples 3-4, but worse than those of Example 1 and Example 6, indicating that there is a synergistic effect between glass fiber, lignin and chitosan. Lignin is loaded on the surface of the glass fiber, and chitosan coats the glass fiber, which increases the adhesion between the glass fiber and lignin, thereby improving the corresponding properties of the glass fiber.

[0143] In the preparation method of modified graphene in Example 8, nano-nickel oxide particles are not added. As can be seen from Table 1, the burning time is 17 s, the burning degree is 8.9%, the oxygen index is 32, the toxicity index is 1.02, the tensile strength is 24.1 MPa, and the elongation at break is 150%, indicating that nano-nickel oxide particles can be loaded on the surface of graphene, thereby improving the corresponding properties of graphene.

[0144] In the preparation method of modified graphene in Example 9, no natural zeolite is added. As can be seen from Table 1, the burning time is 20s, the burning degree is 10.2%, the oxygen index is 30, the toxicity index is 1.23, the tensile strength is 22.1MPa, and the elongation at break is 135%, indicating that natural zeolite has the advantages of high temperature resistance and non-flammability, and can improve the corresponding properties of graphene.

[0145] In the preparation method of modified graphene in Example 10, carbon fiber is not added. As can be seen from Table 1, the burning time is 22s, the degree of combustion is 12.5%, the oxygen index is 28, the toxicity index is 1.42, the tensile strength is 20.4MPa, and the elongation at break is 124%, indicating that carbon fiber can be loaded on the surface of graphene, thereby forming a network structure of graphene with carbon fiber and natural zeolite, thereby improving the mechanical properties and flame retardant properties of graphene.

[0146] Example 12 changes the mass ratio of graphene, natural zeolite and carbon fiber treated in step (1). It can be seen from Table 1 that the burning time, burning degree, oxygen index, toxicity index, tensile strength and elongation at break of the cable are better than those of Examples 9-10, but worse than those of Example 1 and Example 11, indicating that the graphene is loaded on the surface of the natural zeolite and the carbon fiber is loaded on the surface of the graphene, thereby forming a network structure among the graphene, the corresponding properties of the graphene are improved.

[0147] Example 14 changes the ratio of each raw material component of the cable. It can be seen from Table 1 that the burning time, burning degree, oxygen index, toxicity index, tensile strength and elongation at break of the cable are all worse than those of Example 1 and Example 13, indicating that the ratio of each raw material has better mechanical properties and flame retardancy within a certain range.

[0148] Example 15 uses an equal amount of glass fiber instead of modified glass fiber. As can be seen from Table 1, the burning time is 25s, the degree of burning is 14.5%, the oxygen index is 26, the toxicity index is 1.63, the tensile strength is 18.1MPa, and the elongation at break is 120%, indicating that the modified glass fiber prepared in this application has excellent insulation, heat resistance, corrosion resistance and high mechanical strength, improves the heat resistance and heat deformation temperature of the system, and cooperates with other components to improve the corresponding performance of the cable.

[0149] Example 16 uses an equal amount of graphene instead of modified graphene. It can be seen from Table 1 that the burning time is 24s, the burning degree is 13.5%, the oxygen index is 28, the toxicity index is 1.68, the tensile strength is 18.6MPa, and the elongation at break is 125%, indicating that the modified graphene prepared in this application has good mechanical properties and puncture resistance, can improve the mechanical strength and tear resistance of the halogen-free flame retardant and rat-proof layer, and cooperate with other components to improve the corresponding performance of the cable.

[0150] Comparative Example 1 The tinned copper wire is a tinned copper wire core, excluding the refractory layer and the halogen-free flame retardant layer four. As can be seen from Table 1, the burning time is 35s, the burning degree is 20%, the oxygen index is 24, the toxicity index is 1.87, the tensile strength is 15.6MPa, and the elongation at break is 110%, indicating that the cable prepared in this application has excellent insulation, heat resistance, corrosion resistance and high mechanical strength, and is combined with other layer structures to improve the corresponding performance of the cable.

[0151] The insulated wire core of comparative example 2 includes a tinned copper wire, but does not include the halogen-free flame retardant layer three and the shielding layer two. As can be seen from Table 1, the burning time is 34s, the burning degree is 19%, the oxygen index is 23, the toxicity index is 1.89, the tensile strength is 15.8MPa, and the elongation at break is 112%, indicating that the insulated wire core prepared in the present application has good mechanical properties and puncture resistance, and can improve the mechanical strength, tear resistance and other corresponding properties of the cable.

[0152] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A computer and instrument cable, characterized in that: The invention comprises an insulating core (1) and a halogen-free flame retardant layer (2) wrapped around a plurality of mutually twisted insulating cores (1), a shielding layer (3) wrapped around the halogen-free flame retardant layer (2), a halogen-free flame retardant layer (4) wrapped around the shielding layer (3), a corrugated stainless steel layer (5) wrapped around the halogen-free flame retardant layer (4), and a halogen-free flame retardant anti-rat and ant layer (6) wrapped around the corrugated stainless steel layer (5), wherein a halogen-free flame retardant material (21) is filled between the halogen-free flame retardant layer (2) and the insulating core (1); The insulated wire core (1) comprises a tinned copper wire (11), a third halogen-free flame retardant layer (12) coated on the outside of a plurality of twisted tinned copper wires (11), and a second shielding layer (13) coated on the outside of the third halogen-free flame retardant layer (12); The tinned copper wire (11) comprises a tinned copper wire core (111), a fire-resistant layer (112) coated outside the tinned copper wire core (111), and a halogen-free flame-retardant layer (113) coated outside the fire-resistant layer (112); The halogen-free flame retardant layer 1 (2), halogen-free flame retardant layer 2 (4), halogen-free flame retardant layer 3 (12) and halogen-free flame retardant layer 4 (113) all comprise the following components in parts by weight: 60-70 parts of ethylene-vinyl acetate copolymer, 6-10 parts of diisopropylbenzene peroxide, 35-45 parts of modified glass fiber, 5-8 parts of silicone masterbatch, 30-60 parts of white carbon black, 90-100 parts of aluminum hydroxide flame retardant, 1-2 parts of dilauryl thiodipropionate, and 0.5-1 part of polyethylene wax; The preparation method of the modified glass fiber comprises the following steps: (1) The glass fiber is placed in a sodium hydroxide solution, soaked for 30-40 minutes, washed with water, and then dispersed in a titanate coupling agent to obtain a pretreated glass fiber; (2) Dispersing the pretreated glass fiber obtained in step (1) in acetic acid, adding lignin, stirring at a temperature of 60-65°C for 1-2 hours, adding chitosan, continuing to stir, and setting aside; (3) The glass fiber obtained in step (2) is mixed with epoxy resin and stirred at a temperature of 90-95° C. for 30-35 minutes to obtain modified glass fiber.

2. A computer and instrument cable according to claim 1, characterized in that: The mass ratio of the glass fiber, lignin and chitosan is 1:0.4-0.6:0.2-0.

3.

3. A computer and instrument cable according to claim 1, characterized in that: The shielding layer 1 (3) and the shielding layer 2 (13) are both aluminum-plastic composite tapes.

4. A computer and instrument cable according to claim 1, characterized in that: The halogen-free flame-retardant rat- and ant-proof layer (6) comprises the following components in parts by weight: 35-45 parts of polyolefin, 55-65 parts of silicone rubber, 15-25 parts of polyurethane rubber, 20-30 parts of modified graphene, 80-100 parts of magnesium hydroxide flame retardant, 20-30 parts of anti-termite masterbatch, 10-22 parts of silicon nitride powder and 4-8 parts of silicone masterbatch.

5. A computer and instrument cable according to claim 4, characterized in that: The preparation method of the modified graphene comprises the following steps: (1) Disperse graphene in anhydrous ethanol solution, sonicate for 1-3 hours, then add nano-nickel oxide particles, stir for 30-60 minutes, continue sonicating for 3-5 hours, filter, dry, and set aside; (2) Disperse the natural zeolite in a nitric acid solution, stir for 1-3 hours, wash with water, and then disperse in deionized water. Add carbon fiber and stir for 3-6 hours. Add the graphene treated in step (1), stir evenly at a temperature of 200-250°C, and filter to obtain modified graphene.

6. A computer and instrument cable according to claim 5, characterized in that: The mass ratio of the graphene, natural zeolite and carbon fiber processed in step (1) is 0.1-0.3 g:1 mg:0.4-0.6 g.

7. A computer and instrument cable according to claim 1, characterized in that: The fire-resistant layer (112) is a mica tape.

8. The method for preparing a computer and instrument cable according to claim 1, comprising the following steps: S1, drawing and annealing a tinned copper conductor core (111), and wrapping a fire-resistant layer (112) around the tinned copper conductor core (111); weighing components of a halogen-free flame-retardant layer (113), stirring, melt-extruding, and pressing to form a halogen-free flame-retardant layer (113), and wrapping the halogen-free flame-retardant layer (113) around the fire-resistant layer (112) to obtain a tinned copper conductor (11); S2. Extrusion and wrapping of the halogen-free flame retardant layer 3 (12): Weigh the components of the halogen-free flame retardant layer 3 (12) by weight, stir for 30-40 minutes, melt extrude, and press to form the halogen-free flame retardant layer 3 (12), twist a plurality of tinned copper wires (11) together, and wrap the halogen-free flame retardant layer 3 (12) around the twisted tinned copper wires (11); S3. Wrapping the shielding layer 2 (13): Wrapping the shielding layer 2 (13) on the halogen-free flame retardant layer 3 (12) to obtain an insulated wire core (1); S4. Extrusion and wrapping of the halogen-free flame retardant layer (2): Weigh the components of the halogen-free flame retardant layer (2), stir, melt-extrude, and press to form the halogen-free flame retardant layer (2), twist a plurality of insulated wire cores (1) together, and wrap the halogen-free flame retardant layer (2) around the twisted insulated wire cores (1); mix the components of the halogen-free flame retardant material (21), stir, and set aside, and fill the prepared halogen-free flame retardant material (21) between the halogen-free flame retardant layer (2) and the insulated wire core (1); The shielding layer 1 (3) is longitudinally wrapped on the halogen-free flame retardant layer 1 (2); the components of the halogen-free flame retardant layer 2 (4) are stirred, melt-extruded, and pressed to form the halogen-free flame retardant layer 2 (4), and the halogen-free flame retardant layer 2 (4) is wrapped on the halogen-free flame retardant layer 1 (2); the corrugated stainless steel layer (5) is wrapped on the halogen-free flame retardant layer 2 (4), the components of the halogen-free flame retardant rat and ant proof layer (6) are stirred, melt-extruded, and pressed to form the halogen-free flame retardant rat and ant proof layer (6), and the halogen-free flame retardant rat and ant proof layer (6) is wrapped on the corrugated stainless steel layer (5), thereby obtaining the product.

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