An extreme environment weather resistant computer cable and method of making the same

Abstract

The application relates to an extremely environment-resistant computer cable and a preparation method thereof, and belongs to the technical field of computer cables. The cable comprises, from inside to outside, a conductor, an insulation layer, a shielding layer and an outer sheath. The shielding layer is a tinned copper wire braided shielding layer, and the surface of the shielding layer is coated with a conductive protective coating. The conductive protective coating is composed of trifluorochloroethylene alkyl vinyl ether copolyfluorocarbon resin 50-65 parts, aliphatic hydroxyl type polyurethane 10-20 parts, blocked isocyanate curing agent 6-10 parts, fluorosilane modified nano silicon dioxide 2-4 parts, surface amino modified graphene 1.5-2.5 parts, low molecular weight polyisobutylene 2-3 parts and composite light stabilizer 1-2 parts. The braided shielding layer is protected by the specific compounded protective coating, the acid and alkali resistance, salt mist resistance, high temperature resistance and aging resistance and other performances of the shielding layer are remarkably improved, meanwhile, the conductive continuity of the shielding layer is maintained, and the long-term stable signal transmission of the computer cable in an extreme environment is ensured.

Description

Technical Field

[0001] This invention relates to the field of computer cable technology, and more particularly to a computer cable with extreme weather resistance and its preparation method. Background Technology

[0002] Computer cables, as core components for industrial signal transmission, are widely used in extreme environments such as chemical plants, mines, and offshore platforms. Under these conditions, cables must withstand harsh conditions such as high temperatures, strong acid and alkali corrosion, high salt spray erosion, and humid heat aging for extended periods.

[0003] The shielding layer is a key structure for interference resistance and stable signal transmission in computer cables, and is usually made of tin-plated copper wire braiding. However, existing technologies have significant drawbacks in extreme environments: the tin plating layer is prone to electrochemical corrosion in strong acid, alkali, or high salt spray environments, leading to oxidation and blackening of the copper wires, wire breakage, and consequently, reduced shielding efficiency, grounding failure, and even signal interruption. Existing technologies attempt to solve the corrosion problem by coating the shielding layer with an anti-corrosion coating, but traditional anti-corrosion coatings, such as fluorocarbon and polyurethane, are all electrical insulating materials. If a continuous insulating coating is applied to the surface of the braided shielding layer, it will block the contact points between the copper wires and the electrical connection between the shielding layer and the grounding terminal, causing a sharp increase in the DC resistance of the shielding layer and loss of shielding function. At the same time, a single resin coating often cannot simultaneously achieve high adhesion, high flexibility, and long-term aging resistance, and is prone to cracking and peeling after thermal shock or bending, thus losing its protective function.

[0004] Therefore, developing a computer cable shielding protection technology that can effectively block corrosive media, maintain good conductivity, and possess excellent flexibility, crack resistance, and weather resistance is a technical challenge that urgently needs to be solved. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this invention provides a weather-resistant computer cable for extreme environments and its preparation method. By constructing a stable conductive network using amino-modified graphene, the shielding layer's resistance to acids, alkalis, salt spray corrosion, and high-temperature aging is significantly improved, effectively blocking corrosive media without affecting the original conductive continuity and grounding reliability of the shielding layer, thus avoiding a decrease in shielding effectiveness. The coating possesses both excellent flexibility and density, without cracking or peeling after bending, enabling the computer cable to transmit signals stably for extended periods under extreme conditions such as chemical and mining environments. The process is simple and industrially feasible.

[0006] The objective of this invention can be achieved through the following technical solutions: In a first aspect, an extreme environment weather-resistant computer cable is provided, comprising, from the inside out, a conductor, an insulation layer, a shielding layer, and an outer sheath, wherein the shielding layer is a tinned copper wire braided shielding layer, and the surface of the tinned copper wire braided shielding layer is coated with a conductive protective coating; the conductive protective coating comprises, by weight, the following components: chlorotrifluoroethylene. 50-65 parts of alkyl vinyl ether copolyfluorocarbon resin, 10-20 parts of aliphatic hydroxyl polyurethane, 6-10 parts of blocked isocyanate curing agent, 2-4 parts of fluorosilane modified nano silica, 1.5-2.5 parts of surface amino modified graphene, 2-3 parts of low molecular weight polyisobutylene, and 1-2 parts of composite light stabilizer.

[0007] Furthermore, the trifluorochloroethylene Alkyl vinyl ether copolymer fluorocarbon resins have a fluorine content of 25wt%~35wt% and a hydroxyl value of 15~30mgKOH / g. Their high-energy CF bonds provide resistance to acids, alkalis, and chemical media.

[0008] Furthermore, the aliphatic hydroxyl-type polyurethane is a hydroxyl-terminated aliphatic polyurethane with a hydroxyl value of 30~60 mgKOH / g. This provides adhesion and flexibility, preventing the coating from becoming brittle. Furthermore, the blocked isocyanate curing agent is a blocked hexamethylene diisocyanate trimer or a blocked isophorone diisocyanate derivative, with a desealing temperature of 90~130℃. Under heating conditions, it deseales and chemically crosslinks with the hydroxyl groups in the fluorocarbon resin and polyurethane, forming a dense network structure.

[0009] Furthermore, the fluorosilane-modified nano-silica is prepared by graft modification with a fluorosilane coupling agent, and its D50 particle size is 20nm~50nm; the fluorosilane coupling agent is selected from tridecafluorooctyltrimethoxysilane or heptadecafluorodecyltrimethoxysilane. This improves the coating density and hydrophobicity.

[0010] Furthermore, the surface-modified amino graphene is prepared by grafting graphene with γ-aminopropyltriethoxysilane and then chemically reducing it, resulting in an aspect ratio greater than 500. It forms a conductive network within the coating. The graphene forms a microscopic conductive network within the insulating resin matrix, giving the coating overall micro-conductivity.

[0011] Furthermore, the low molecular weight polyisobutylene has a number average molecular weight of 800-1200. It fills micropores, improving water resistance and flexural strength.

[0012] Furthermore, the composite light stabilizer is composed of hindered amine light stabilizer 944 and ultraviolet absorber UV327 in a mass ratio of 1:1.

[0013] Furthermore, the dry film thickness of the conductive protective coating is 10μm~20μm.

[0014] Secondly, a method for preparing a computer cable with extreme environment weather resistance is provided, comprising the following steps: (1) The conductor is drawn into wires and bundled into shape, and an insulating layer is extruded on the surface of the conductor to obtain an insulated wire core; (2) Twist the insulated wire cores into a cable and braid a tinned copper wire shielding layer around the cable core; (3) Trifluorochloroethylene Alkyl vinyl ether copolymer fluorocarbon resin, aliphatic hydroxyl polyurethane, and butyl acetate / propylene glycol methyl ether acetate mixed solvent are mixed and stirred at 500~1000 r / min for 10~20 min until completely dissolved; then, a blocked isocyanate curing agent, fluorosilane modified nano silica, modified graphene, and low molecular weight polyisobutylene are added and dispersed at 1500~2500 r / min for 15~30 min; finally, a composite light stabilizer is added and dispersion is continued for 5~10 min to obtain a conductive protective coating. (4) Apply the conductive protective coating liquid evenly to the surface of the braided tin-plated copper wire shielding layer by spraying or roller coating, control the dry film thickness of the coating to 10μm~20μm, pre-bake at 80℃ for 10~20 minutes, and cure at 120℃ for 20~30 minutes to deseal the blocked isocyanate and cross-link with the hydroxyl groups in the resin to form a continuous and dense conductive protective coating. (5) An outer sheath is extruded on the outside of the shielding layer to obtain a computer cable with extreme environment weather resistance.

[0015] The beneficial effects of this invention are as follows: (1) This invention uses trifluorochloroethylene-alkyl vinyl ether copolymer fluorocarbon resin as the matrix, combined with a blocked isocyanate curing agent to form a cross-linked network structure, and combined with fluorosilane-modified nano-silica to construct a dense physical and chemical barrier, which can effectively block the penetration of strong acids, strong alkalis and salt spray ions, and protect the internal conductor and shielding layer from electrochemical corrosion. The surface amino-modified graphene utilizes its high aspect ratio and surface functional groups to have good compatibility with the trifluorochloroethylene-alkyl vinyl ether copolymer resin matrix, and can construct a stable conductive path at a low addition amount, so that the coating has excellent anti-corrosion performance while maintaining micro conductivity, ensuring the continuity of shielding function and the stability of signal transmission of computer cables in extreme corrosive environments.

[0016] (2) In this invention, aliphatic hydroxyl polyurethane and low molecular weight polyisobutylene are used as flexible components. The high elasticity of aliphatic hydroxyl polyurethane and the viscoelasticity and migration characteristics of low molecular weight polyisobutylene endow the coating with excellent bending resistance. When computer cables are repeatedly bent, the coating is not easy to crack, and the low molecular weight polyisobutylene can fill microcracks and prevent crack propagation, thereby maintaining the integrity of the coating.

[0017] (3) The present invention utilizes the synergistic effect of ultraviolet absorbers and hindered amine light stabilizers, combined with the inherent UV resistance of trifluorochloroethylene-alkyl vinyl ether copolyfluorocarbon resin, to significantly delay the photo-oxidative degradation process of the coating, maintain the mechanical strength and adhesion of the coating for longer, and prevent the coating from powdering and peeling off under long-term high temperature and strong light irradiation, thereby continuously providing a complete physical barrier for the internal shielding layer and greatly extending the service life of computer cables in harsh outdoor environments. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with preferred embodiments, is provided below.

[0019] Preparation Example 1: Preparation of Fluorosilane-Modified Nano-Silica 100g of nano-silica was added to a mixed solution of 900g anhydrous ethanol and 20g deionized water. Mechanical stirring and simultaneous ultrasonic dispersion were performed for 30min to form a homogeneous suspension. Acetic acid was added dropwise to adjust the pH to 4-5, followed by the addition of 8g of tridecafluorooctyltrimethoxysilane. The mixture was placed in a 70℃ constant temperature water bath and stirred at 800 rpm for 4h. After the reaction was complete, the mixture was filtered, washed three times with ethanol to remove unreacted silane, and finally dried under vacuum at 100℃ for 4h to obtain fluorosilane-modified nano-silica.

[0020] Preparation Example 2: Preparation of Surface-Modified Graphene with Amino Acids 10g of graphene oxide (GO) powder was weighed and dispersed in a mixed solution of 400mL deionized water and 100mL anhydrous ethanol (volume ratio 4:1). The solution was ultrasonically exfoliated for 60 minutes to form a homogeneous and stable suspension. 5g of γ-aminopropyltriethoxysilane (KH550) was added to the suspension, and the pH was adjusted to 9-10 with ammonia. The mixture was then refluxed under magnetic stirring at 80℃ for 12-24 hours. After the reaction, the product was centrifuged, washed twice with ethanol, and then twice with deionized water to remove unreacted coupling agents and impurities. The washed solid was redispersed in 1000mL of deionized water, and 10g of ascorbic acid (vitamin C) was added. The mixture was stirred at 95℃ for 4 hours. After drying, surface-modified amino graphene was obtained.

[0021] Example 1 A computer cable with extreme environment weather resistance, comprising a conductive protective coating formulation (parts by weight): Trichlorofluoroethylene-alkyl vinyl ether copolymer fluorocarbon resin (FEVE, fluorine content 30%, hydroxyl value 20): 58 parts Aliphatic hydroxyl polyurethane (hydroxyl value 43): 15 parts Blocked hexamethylene diisocyanate trimer curing agent (unsealing temperature 110℃): 8 parts Fluorosilane-modified nano-silica: 3 parts Surface-modified amino graphene: 2 parts Low molecular weight polyisobutylene (Mn=1000): 2.5 parts Composite light stabilizer (HALS-944:UV-327 = 1:1): 1.5 parts The preparation method is as follows: (1) The conductor is drawn into wires and bundled into shape, and an insulating layer is extruded on the surface of the conductor to obtain an insulated wire core; (2) Twist the insulated wire cores into a cable and braid a tinned copper wire shielding layer around the cable core; (3) The trifluorochloroethylene in the above formula Alkyl vinyl ether co-fluorocarbon resin and aliphatic hydroxyl polyurethane resin were dissolved in a butyl acetate / propylene glycol methyl ether acetate (3:1) mixed solvent and stirred at 750 r / min for 15 min until completely dissolved; curing agent, modified nano silica, modified graphene, and low molecular weight polyisobutylene were added and dispersed at 2000 r / min for 22 min; then a composite light stabilizer was added and dispersion was continued for 7 min to obtain a conductive protective coating. (4) The conductive protective coating liquid is uniformly coated on the surface of the shielding layer using a precision spraying process. The dry film thickness is controlled to be about 15μm. After pre-baking at 80℃ for 15 minutes and curing at 120℃ for 25 minutes, the curing agent is unsealed and the resin undergoes cross-linking and curing.

[0022] (5) An outer sheath is extruded on the outside of the shielding layer to obtain a computer cable with extreme environment weather resistance.

[0023] Example 2 A computer cable with extreme environment weather resistance, comprising a conductive protective coating formulation (parts by weight): Trichlorofluoroethylene-alkyl vinyl ether copolymer fluorocarbon resin (FEVE, fluorine content 25%, hydroxyl value 16): 52 parts Aliphatic hydroxyl polyurethane (hydroxyl value 32): 10 parts Blocked hexamethylene diisocyanate trimer curing agent (unsealing temperature 92℃): 6 parts Fluorosilane-modified nano-silica: 2 parts Surface-modified amino graphene: 1.5 parts Low molecular weight polyisobutylene (Mn=800): 2 parts Composite light stabilizer (HALS-944:UV-327 = 1:1): 1 part The preparation method is as follows: (1) The conductor is drawn into wires and bundled into shape, and an insulating layer is extruded on the surface of the conductor to obtain an insulated wire core; (2) Twist the insulated wire cores into a cable and braid a tinned copper wire shielding layer around the cable core; (3) The trifluorochloroethylene in the above formula Alkyl vinyl ether co-fluorocarbon resin and aliphatic hydroxyl polyurethane resin were dissolved in a butyl acetate / propylene glycol methyl ether acetate (3:1) mixed solvent and stirred at 500 r / min for 10 min until completely dissolved; curing agent, modified nano silica, surface amino-modified graphene, and low molecular weight polyisobutylene were added and dispersed at 1500 r / min for 15 min; then a composite light stabilizer was added and dispersion was continued for 5 min to obtain a conductive protective coating. (4) The conductive protective coating is uniformly applied to the surface of the shielding layer using a precision spraying process, and the dry film thickness is controlled to be about 10 μm. After pre-baking at 80℃ for 10 minutes and curing at 120℃ for 20 minutes, the curing agent is unsealed and the resin undergoes cross-linking and curing.

[0024] (5) An outer sheath is extruded on the outside of the shielding layer to obtain a computer cable with extreme environment weather resistance.

[0025] Example 3 A computer cable with extreme environment weather resistance, comprising a conductive protective coating formulation (parts by weight): Trichlorofluoroethylene-alkyl vinyl ether copolymer fluorocarbon resin (FEVE, fluorine content 35%, hydroxyl value 28): 65 parts Aliphatic hydroxyl polyurethane (hydroxyl value 58): 20 parts Blocked hexamethylene diisocyanate trimer curing agent (unsealing temperature 130℃): 10 parts Fluorosilane-modified nano-silica: 4 parts Surface-modified amino graphene: 2.5 parts Low molecular weight polyisobutylene (Mn=1200): 3 parts Composite light stabilizer (HALS-944:UV-327 = 1:1): 2 parts The preparation method is as follows: (1) The conductor is drawn into wires and bundled into shape, and an insulating layer is extruded on the surface of the conductor to obtain an insulated wire core; (2) Twist the insulated wire cores into a cable and braid a tinned copper wire shielding layer around the cable core; (3) The trifluorochloroethylene in the above formula Alkyl vinyl ether copolymer fluorocarbon resin and aliphatic hydroxyl polyurethane resin were dissolved in a butyl acetate / propylene glycol methyl ether acetate (3:1) mixed solvent and stirred at 1000 r / min for 20 min until completely dissolved. Curing agent, modified nano silica, surface amino modified graphene, and low molecular weight polyisobutylene were added and dispersed at 2500 r / min for 30 min. Then, a composite light stabilizer was added and dispersion was continued for 10 min to obtain a conductive protective coating. (4) The conductive protective coating liquid is uniformly coated on the surface of the shielding layer using a precision spraying process, and the dry film thickness is controlled to be about 18 μm. After pre-baking at 80℃ for 20 minutes and curing at 120℃ for 30 minutes, the curing agent is unsealed and the resin undergoes cross-linking and curing.

[0026] (5) An outer sheath is extruded on the outside of the shielding layer to obtain a computer cable with extreme environment weather resistance.

[0027] Comparative Example 1 Based on Example 1, no surface-modified graphene was added to the coating, and all other conditions were the same as in Example 1.

[0028] Comparative Example 2 Based on Example 1, no blocked isocyanate curing agent was added to the coating, and other conditions were the same as in Example 1.

[0029] Comparative Example 3 Based on Example 1, aliphatic hydroxyl polyurethane and low molecular weight polyisobutylene were not added to the coating, and other conditions were the same as in Example 1.

[0030] Comparative Example 4 Based on Example 1, the fluorosilane-modified nano-silica in the coating was replaced with unmodified nano-silica, and other conditions were the same as in Example 1.

[0031] Comparative Example 5 Based on Example 1, the composite light stabilizer was replaced with a single hindered amine light stabilizer 944, and other conditions were the same as in Example 1.

[0032] Comparative Example 6 Based on Example 1, the composite light stabilizer was replaced with a single ultraviolet absorber, UV327, while other conditions remained the same as in Example 1.

[0033] Comparative Example 7 Based on Example 1, the tin-plated copper wire braided shielding layer is not coated with a conductive protective coating, and other conditions are the same as in Example 1.

[0034] Comparative Example 8 Based on Example 1, no aliphatic hydroxyl polyurethane was added to the coating, and other conditions were the same as in Example 1.

[0035] Comparative Example 9 Based on Example 1, no low molecular weight polyisobutylene was added to the coating, and other conditions were the same as in Example 1.

[0036] Comparative Example 10 Based on Example 1, the surface amino-modified graphene was replaced with unmodified graphene (ordinary graphene powder), and other conditions were the same as in Example 1.

[0037] Comparative Example 11 Based on Example 1, the surface amino-modified graphene was replaced with carboxyl-modified graphene (grafted using a carboxylsilane coupling agent), and other conditions were the same as in Example 1.

[0038] Comparative Example 12 Based on Example 1, the amount of surface amino-modified graphene was adjusted to 0.8 parts, and other conditions were the same as in Example 1.

[0039] Comparative Example 13 Based on Example 1, the amount of surface amino-modified graphene was adjusted to 4 parts, and other conditions were the same as in Example 1.

[0040] Comparative Example 14 Based on Example 1, the amount of fluorosilane-modified nano-silica was adjusted to 1 part, and other conditions were the same as in Example 1.

[0041] Comparative Example 15 Based on Example 1, the amount of fluorosilane-modified nano-silica was adjusted to 6 parts, while other conditions remained the same as in Example 1.

[0042] Comparative Example 16 Based on Example 1, the aliphatic hydroxyl polyurethane was replaced with an aromatic hydroxyl polyurethane, and other conditions were the same as in Example 1.

[0043] Comparative Example 17 Based on Example 1, the low molecular weight polyisobutylene (Mn=1000) was replaced with medium to high molecular weight polyisobutylene (Mn≈6000), and other conditions were the same as in Example 1.

[0044] Performance testing and effect verification The computer cables prepared in Examples 1-3 and Comparative Examples 1-17 were tested for performance according to the following standards, and the results are shown in Table 1: The DC resistance of the shielding layer should be tested according to GB / T 3048.4-2007, measuring the resistance change before and after extreme environmental conditions. The criterion for acceptance is a resistance increase of ≤10Ω / km after testing, in Ω / km. When the DC resistance of the shielding layer exceeds 100Ω / km, effective signal shielding and grounding protection cannot be guaranteed, and the shielding function is deemed to have failed.

[0045] Acid and alkali resistance test: The samples were immersed in 98% sulfuric acid solution and 30% sodium hydroxide solution for 7 days respectively, and the resistance was tested and the appearance was observed.

[0046] Salt spray resistance performance was tested according to GB / T 10125-2021 standard, with continuous spraying of 5% NaCl solution for 500 hours.

[0047] The high-temperature aging test was conducted in accordance with GB / T 2951 standard, with continuous aging in a 150℃ hot air aging chamber for 500 hours.

[0048] The dynamic bending resistance test is performed according to GB / T 2951 standard, involving 100 repeated bends at room temperature.

[0049] Table 1. Performance test results of the shielding layer in the examples and comparative examples.

[0050] The results showed that after undergoing rigorous tests including acid, alkali, salt spray, high temperature, and bending, the DC resistance of the shielding layer in Examples 1-3 exhibited only minor fluctuations. This indicates that the present invention, through a specific coating formulation, constructs a dense, flexible, and conductive protective network on the surface of the shielding layer. This network successfully blocks the intrusion of corrosive media and alleviates external stress, thereby ensuring the excellent electrical continuity and stability of the shielding layer under extreme environments.

[0051] Compared to the examples, the shielding layer of Comparative Example 7 without a protective coating showed a continuous increase in resistance to 32.5 Ω / km under extreme conditions, and the tin plating layer was easily corroded. Comparative Example 1 did not add surface-modified amino graphene; the coating was entirely an insulating resin layer, with an initial resistance exceeding 100 Ω / km, disrupting the electrical connection of the shielding layer and causing the shielding function to fail. The unmodified or carboxyl-modified graphene in Comparative Examples 10 and 11 exhibited poor dispersion and easy aggregation in the resin matrix, resulting in initial resistances as high as 38.5 Ω / km and 42.7 Ω / km, respectively. Comparative Example 12 had a graphene content below the lower limit (0.8 parts), resulting in excessively large spacing between conductive particles, which prevented the formation of a percolation conductive network, and the initial resistance exceeded 100 Ω / km. Comparative Example 13 had a graphene content above the upper limit (4 parts). Although the initial conductivity was good, the excessive hydrophilic graphene sheets formed hydrophilic channels in the coating, allowing corrosive media to penetrate along the interface. After acid resistance, alkali resistance, and salt spray resistance, the resistance increased to 18.5 Ω / km, 17.2 Ω / km, and 22.3 Ω / km, respectively. Furthermore, the excessive graphene destroyed the continuous and dense structure of the coating, leading to increased brittleness and a resistance exceeding 100 Ω / km after bending. In Comparative Examples 2 and 4, the coatings failed to form a dense cross-linked network structure, or the filler dispersion was poor, leading to rapid penetration of corrosive media. In acid and alkali resistance, salt spray resistance, and high-temperature aging tests, the resistance quickly exceeded 100 Ω / km, indicating severe corrosion failure of the shielding layer. In bending tests, due to poor mechanical properties of the coating, the resistance also rose to 45.6 Ω / km and 38.2 Ω / km, respectively, failing to meet usage requirements. In Comparative Example 14, the amount of fluorosilane-modified nano-silica was below the lower limit (1 part), resulting in insufficient coating density. Corrosive media penetrated along micropores, and the resistance exceeded 100 Ω / km after acid and alkali resistance and salt spray resistance tests. In Comparative Example 15, the amount was above the upper limit (6 parts), causing excessive inorganic particles to agglomerate in the coating, forming interface defects. After acid, alkali, and salt spray tests, the resistance rose to 18.9 Ω / km, 17.5 Ω / km, and 21.7 Ω / km, respectively, and the coating became more brittle, with the resistance exceeding 100 Ω / km after bending. Comparative Example 3, lacking both aliphatic hydroxyl polyurethane and low molecular weight polyisobutylene, resulted in an overly hard and brittle coating that cracked upon bending, with a resistivity exceeding 100 Ω / km after bending. Comparative Examples 8 and 9 exhibited insufficient flexibility, leading to damage to the conductive network upon bending, and resistivity rising to 11.3 Ω / km and 10.8 Ω / km, respectively. Comparative Example 16, by replacing the aliphatic hydroxyl polyurethane with aromatic hydroxyl polyurethane, showed a resistivity exceeding 100 Ω / km after high-temperature aging. Comparative Example 17, using medium-to-high molecular weight polyisobutylene instead of low molecular weight polyisobutylene, exhibited a semi-solid waxy state at room temperature, with high molecular chain entanglement, easily losing the low viscosity and rapid migration capabilities characteristic of low molecular weight polyisobutylene; its initial and corrosion resistance properties were inferior to Example 1, and its resistivity sharply exceeded 100 Ω / km after bending.Comparative Examples 5 and 6, which used a single light stabilizer, showed resistances exceeding 100 Ω / km after high-temperature aging. This indicates that a single light stabilizer cannot provide a long-lasting anti-aging synergistic effect, and the coatings failed under long-term thermo-oxidative conditions, leading to the failure of the shielding layer performance.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A computer cable with extreme environment weather resistance, comprising, from the inside out, a conductor, an insulation layer, a shielding layer, and an outer sheath, characterized in that, The shielding layer is a tin-plated copper wire braided shielding layer, and the surface of the tin-plated copper wire braided shielding layer is coated with a conductive protective coating; the conductive protective coating contains the following components by weight: trichlorofluoroethylene. 50-65 parts of alkyl vinyl ether copolyfluorocarbon resin, 10-20 parts of aliphatic hydroxyl polyurethane, 6-10 parts of blocked isocyanate curing agent, 2-4 parts of fluorosilane modified nano silica, 1.5-2.5 parts of surface amino modified graphene, 2-3 parts of low molecular weight polyisobutylene, and 1-2 parts of composite light stabilizer.

2. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The trifluorochloroethylene The fluorine content of the alkyl vinyl ether copolyfluorocarbon resin is 25wt%~35wt%, and the hydroxyl value is 15~30mgKOH / g.

3. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The aliphatic hydroxyl-type polyurethane is a hydroxyl-terminated aliphatic polyurethane with a hydroxyl value of 30~60 mgKOH / g.

4. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The blocked isocyanate curing agent is a blocked hexamethylene diisocyanate trimer or a blocked isophorone diisocyanate derivative, and the unblocking temperature is 90~130℃.

5. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The fluorosilane-modified nano-silica is prepared by grafting modification with a fluorosilane coupling agent, and its D50 particle size is 20nm~50nm; the fluorosilane coupling agent is selected from tridecafluorooctyltrimethoxysilane or heptadecafluorodecyltrimethoxysilane.

6. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The surface amino-modified graphene is prepared by grafting graphene with γ-aminopropyltriethoxysilane and then chemically reducing it, with an aspect ratio greater than 500.

7. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The number average molecular weight of the low molecular weight polyisobutylene is 800~1200.

8. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The composite light stabilizer is composed of hindered amine light stabilizer 944 and ultraviolet absorber UV327 in a mass ratio of 1:

1.

9. The extreme environment weather-resistant computer cable according to claim 1, characterized in that, The dry film thickness of the conductive protective coating is 10μm~20μm.

10. A method for preparing an extreme environment weather-resistant computer cable according to any one of claims 1 to 9, characterized in that, Includes the following steps: (1) The conductor is drawn into wires and bundled into shape, and an insulating layer is extruded on the surface of the conductor to obtain an insulated wire core; (2) Twist the insulated wire cores into a cable and braid a tinned copper wire shielding layer around the cable core; (3) Trifluorochloroethylene Alkyl vinyl ether copolymer fluorocarbon resin, aliphatic hydroxyl polyurethane, and butyl acetate / propylene glycol methyl ether acetate mixed solvent are mixed and stirred at 500~1000 r / min for 10~20 min until completely dissolved; then, a blocked isocyanate curing agent, fluorosilane modified nano silica, surface amino modified graphene, and low molecular weight polyisobutylene are added and dispersed at 1500~2500 r / min for 15~30 min; finally, a composite light stabilizer is added and dispersion is continued for 5~10 min to obtain a conductive protective coating. (4) Apply the conductive protective coating liquid evenly to the surface of the braided tin-plated copper wire shielding layer by spraying or roller coating, control the dry film thickness of the coating to 10μm~20μm, pre-bake at 80℃ for 10~20 minutes, and cure at 120℃ for 20~30 minutes to de-encapsulate the blocked isocyanate and cross-link with the hydroxyl groups in the resin to form a continuous and dense conductive protective coating. (5) An outer sheath is extruded on the outside of the shielding layer to obtain a computer cable with extreme environment weather resistance.

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