Water-resistant aluminum-plastic composite belt for cable and preparation method of water-resistant aluminum-plastic composite belt

Abstract

The invention discloses a water-resistant aluminum-plastic composite belt for a cable and a preparation method of the water-resistant aluminum-plastic composite belt, and relates to the technical field of aluminum-plastic composite belts. Comprising the following steps that 1, the surface of an aluminum strip is subjected to oil removal and electrolysis, anodic oxidation treatment is conducted in a phosphoric acid solution, and a pretreated aluminum strip is obtained; (2) the pretreated aluminum strip is placed in a coupling agent solution to be pretreated, and an interface modified aluminum strip is obtained; 2, an ethylene-acrylic acid copolymer, a GMA-EMA copolymer, low-density polyethylene, isocyanate modified low-density polyethylene, modified hexagonal boron nitride, a peroxide initiator, a lubricant and an antioxidant are mixed and subjected to open milling for standby application, and a polyolefin material is obtained; and 3, preheating the interface modified aluminum tape, arranging a polyolefin material on the surface, performing hot-pressing vulcanization, cooling and trimming to obtain the water-resistant aluminum-plastic composite tape. The prepared water-resistant aluminum-plastic composite belt has good water resistance and mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-plastic composite tapes, in particular to a water-resistant aluminum-plastic composite tape for cables and a preparation method thereof. Background Art

[0002] Aluminum-plastic composite tape is generally a composite material made of aluminum tape and plastics such as polyolefins. It has the advantages of being lightweight and moisture-proof and is widely used in the cable industry.

[0003] Currently, aluminum-plastic composite tapes suffer from poor interfacial adhesion due to the polarity differences between the aluminum tape and materials such as polyolefins, which affects the overall strength of the cable and limits their use in certain environments. Prior art typically introduces substances containing polar groups into polyolefin materials to enhance interfacial adhesion. Because the introduction of polar group-containing substances can reduce insulation, substances such as boron nitride are often introduced to ensure electrical insulation performance. However, these technologies present the following challenges: First, compatibility issues exist between polar group-containing substances, boron nitride, and other components, impacting mechanical properties. Second, the hygroscopicity of polar groups makes the aluminum-plastic composite tapes less water-resistant, making the plastic layer susceptible to delamination in humid environments over time. Furthermore, polyolefin materials have poor heat resistance, which increases the risk of cable damage and shortens its service life if exposed to high temperatures and humidity.

[0004] In summary, it is of great significance to solve the above problems and prepare a water-resistant aluminum-plastic composite tape for cables. Summary of the Invention

[0005] The object of the present invention is to provide a water-resistant aluminum-plastic composite tape for cables and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for preparing a water-resistant aluminum-plastic composite tape for a cable comprises the following steps: Step 1: (1) degreasing and electrolyzing the surface of the aluminum strip, and then anodizing the strip in a phosphoric acid solution to obtain a pretreated aluminum strip; (2) pretreating the pretreated aluminum strip in a coupling agent solution to obtain an interface-modified aluminum strip; Step 2: mixing ethylene-acrylic acid copolymer, GMA-EMA copolymer, low-density polyethylene, isocyanate-modified low-density polyethylene, modified hexagonal boron nitride, peroxide initiator, lubricant, and antioxidant, and refining for later use to obtain a polyolefin material; Step 3: preheating the interface modified aluminum strip, setting the polyolefin material on the surface, hot pressing and vulcanizing, cooling, and trimming to obtain a water-resistant aluminum-plastic composite strip.

[0007] More optimally, the preparation method of the pretreated aluminum strip is: wiping the surface of the aluminum strip with acetone, then placing it in a 10~20wt% perchloric acid-ethanol solution, using platinum foil as the counter electrode, setting the current to 2.5~3A at room temperature, electrolyzing for 120~150 seconds, washing and drying; transferring it to a 5~6wt% phosphoric acid-water solution, setting the voltage to 40~60V at room temperature, anodizing for 60~120 minutes, washing and drying to obtain a pretreated aluminum strip.

[0008] More optimally, the coupling agent solution has a solid content of 10-12 wt% ethanol solution; the silane coupling agent includes a methacrylate silane coupling agent and a mercaptosilane coupling agent in a mass ratio of 4-5:1; and the volume ratio of the pretreated aluminum strip to the coupling agent solution is 1:4-6.

[0009] More optimally, the raw materials of the polyolefin material include the following components: by weight, 43 to 48 parts of ethylene-acrylic acid copolymer, 8 to 12 parts of GMA-EMA copolymer, 25 to 30 parts of low-density polyethylene, 15 to 20 parts of isocyanate-modified low-density polyethylene, 9 to 12 parts of modified hexagonal boron nitride, 0.05 to 0.1 parts of peroxide initiator, 0.2 to 0.3 parts of lubricant, and 0.2 to 0.3 parts of antioxidant.

[0010] More optimally, the preparation method of the isocyanate-modified low-density polyethylene is as follows: low-density polyethylene is added to xylene, isocyanoethyl methacrylate and a peroxide initiator are added, the temperature is set to 120-125° C. under a nitrogen atmosphere, the reaction is carried out for 4-5 hours, the reaction is continued, the reaction is continued, the reaction is continued, the reaction is continued, the reaction is continued, and the isocyanate-modified low-density polyethylene is obtained; the mass ratio of low-density polyethylene to isocyanoethyl methacrylate is 1:0.1-0.2.

[0011] More optimally, the preparation method of the modified hexagonal boron nitride is: (1) Hexagonal boron nitride and epoxysilane coupling agent are sequentially added to a 40-50% ethanol aqueous solution, stirred at 60-70°C for 24 hours, washed, and dried to obtain epoxide boron nitride; epoxide boron nitride is added to tetrahydrofuran, 4-aminobiphenyl and 3-amino-1-propanol are added, stirred at 60-70°C for 4-6 hours, washed, and dried to obtain intercalated boron nitride; intercalated boron nitride is uniformly dispersed in toluene, triethylamine is added and stirred evenly; bromoisobutyryl bromide-toluene solution is added dropwise under ice bath, stirred at room temperature overnight, centrifuged, washed, and dried to obtain bromoboron nitride; (2) Add ethylene-acrylic acid copolymer, triethylamine, and hydroquinone to DMF, raise the temperature to 50-60°C under a nitrogen atmosphere, add perillaldehyde-DMF solution dropwise, set the temperature to 65-80°C, react for 4-8 hours, wash, and dry to obtain a modified ethylene-acrylic acid copolymer; (3) Add bromo-boron nitride to a methanol aqueous solution, and then add a modified ethylene-acrylic acid copolymer and copper bromide under a nitrogen atmosphere; react in the dark for 48 hours, wash, and dry to obtain modified hexagonal boron nitride.

[0012] More optimally, in the raw materials of the epoxidized boron nitride, the mass ratio of boron nitride to epoxysilane coupling agent is 1:0.2-0.5; in the raw materials of the intercalated boron nitride, the mass ratio of epoxidized boron nitride to 4-aminobiphenyl and 3-amino-1-propanol is 1:0.2-0.3:0.2-0.3; in the raw materials of the brominated boron nitride, the mass ratio of intercalated boron nitride to bromoisobutyryl bromide is 1:0.1-0.2; In the raw materials of the modified ethylene-acrylic acid copolymer, the mass ratio of the ethylene-acrylic acid copolymer to perillaldehyde is 1:0.2-0.3; In the raw materials of the modified hexagonal boron nitride, the mass ratio of bromine boron nitride to modified ethylene-acrylic acid copolymer is 1:2.

[0013] More optimally, the temperature of the open mill is 135-145°C; the preheating temperature is 120-130°C; the hot pressing vulcanization temperature is 160-180°C, the pressure is 8-12 MPa, and the time is 5-15 minutes; More optimally, the thickness of the aluminum strip is 0.1-0.2 mm; the thickness of the polyolefin material is 0.05-0.15 mm.

[0014] A water-resistant aluminum-plastic composite tape for cables is prepared by a method for preparing the same.

[0015] Compared with the existing technology, the beneficial effects achieved by the present invention are: first, the aluminum strip is specifically treated to effectively improve its surface properties and promote its interfacial bonding with the polyolefin material; second, by optimizing and modifying the components of the polyolefin material, the interfacial bonding with the aluminum strip is effectively improved while improving the water resistance and mechanical properties.

[0016] In this proposal, the interface-modified aluminum strip is anodized in a phosphoric acid solution to form a porous oxide layer, creating a certain surface roughness. This promotes interfacial bonding with the polyolefin material and improves interfacial strength. Furthermore, a silane coupling agent containing methacrylate and mercapto groups is used to crosslink with groups in the polyolefin material, further enhancing interfacial strength. Compared to sulfuric acid, phosphoric acid provides better interfacial adhesion. This is because the micropores formed in the phosphoric acid oxide layer are larger in diameter and more evenly distributed than those in the sulfuric acid oxide layer, facilitating polyolefin melt penetration and enhancing mechanical interlocking (anchoring effect). This also increases the effective contact area and improves physical bonding.

[0017] The polyolefin material in this proposal is primarily composed of ethylene-acrylic acid copolymer and low-density polyethylene, compounded with GMA-EMA copolymer and isocyanate-modified low-density polyethylene to form a multi-group cross-linked network. This improves material compatibility and enhances interfacial adhesion, effectively promoting cross-linking network formation, reducing polar groups, and enhancing water resistance. The introduction of modified hexagonal boron nitride effectively ensures insulation while enhancing mechanical properties, heat resistance, and water resistance in hot and humid conditions, ultimately enhancing the overall performance and service life of the water-resistant aluminum-plastic composite tape.

[0018] The inclusion of GMA-EMA copolymer can partially replace the ethylene-acrylic acid copolymer; the epoxy groups it contains can crosslink with the thiol groups on the interface-modified aluminum tape, as well as with the carboxyl groups of the ethylene-acrylic acid copolymer, strengthening the crosslinked network and promoting improved water resistance. However, since crosslinking of epoxy and carboxyl groups produces hydroxyl groups, which still retain water-absorbing groups, the introduction of isocyanate-modified low-density polyethylene effectively consumes the hydroxyl groups, improving water resistance while strengthening the crosslinked network and boosting mechanical properties. Furthermore, the sequential crosslinking of the multi-group crosslinked network can effectively buffer crosslinking stress, effectively improving the overall strength of the water-resistant aluminum-plastic composite tape.

[0019] Among them, hexagonal boron nitride has dispersibility and interface compatibility; therefore, it is first epoxidized, and then 4-aminobiphenyl and 3-amino-1-propanol are intercalated or surface-grafted using epoxy groups to obtain intercalated boron nitride; the introduction of biphenyl structure and propane chain effectively increases the interlayer spacing, improves the dispersibility of boron nitride, and improves heat resistance; at the same time, the hydroxyl groups contained in the intercalated boron nitride are further reacted with bromoisobutyryl bromide to form bromo boron nitride, which can react with unsaturated groups; thereby, the vinyl group contained in the modified ethylene-acrylic acid copolymer grafted with perillaldehyde is reacted and grafted with bromo boron nitride, and the compatibility of the modified ethylene-acrylic acid copolymer is utilized to effectively and evenly disperse the modified hexagonal boron nitride in the matrix material, thereby improving the mechanical strength while uniformly improving the heat resistance, and improving the heat resistance under hot and humid conditions. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that the following parts are calculated by weight, and the purchase manufacturers of all raw materials involved in the present invention are exemplified without any special restrictions: in the following embodiments, the brand of ethylene-acrylic acid copolymer is CS-1, the brand of low-density polyethylene is 0220KJ, the GMA-EMA copolymer is glycidyl methacrylate grafted ethylene-methyl acrylate copolymer, the brand is SH022, the product number of hexagonal boron nitride is hexagonal boron nitride, the brand is Xi'an Qiyue; the above-mentioned raw materials and the raw materials involved are all commercially purchased.

[0022] The preparation method of isocyanate-modified low-density polyethylene is as follows: 10 parts of low-density polyethylene is added to 70 parts of xylene, 2 parts of isocyanoethyl methacrylate and 0.2 parts of peroxide initiator DCP are added, and the temperature is set at 120° C. under a nitrogen atmosphere for 5 hours, followed by cooling, washing, and drying to obtain isocyanate-modified low-density polyethylene; The preparation method of the modified hexagonal boron nitride is as follows: (1) adding 10 parts of hexagonal boron nitride and 4 parts of epoxysilane coupling agent KH560 to 50 parts of 50% ethanol aqueous solution in sequence, stirring at 60°C for 24 hours, washing and drying to obtain epoxidized boron nitride; adding 10 parts of epoxidized boron nitride to 50 parts of tetrahydrofuran, adding 0.2 parts of 4-aminobiphenyl and 0.3 parts of 3-amino-1-propanol, stirring at 70°C for 4 hours, washing and drying to obtain intercalated boron nitride; uniformly dispersing 10 parts of intercalated boron nitride in 60 parts of toluene, adding 1 part of triethylamine and stirring evenly; under ice bath, dropwise adding 15w of bromoisobutyryl bromide containing 0.15 parts of bromoisobutyryl bromide. t% toluene solution, stirred at room temperature overnight, centrifuged, washed and dried to obtain brominated boron nitride; (2) 10 parts of ethylene-acrylic acid copolymer, 1 part of triethylamine and 0.5 parts of hydroquinone were added to 50 parts of DMF, heated to 50°C under nitrogen atmosphere, and 30wt% DMF solution containing 3 parts of perillaldehyde was added dropwise, the temperature was set to 70°C, reacted for 6 hours, washed and dried to obtain modified ethylene-acrylic acid copolymer; (3) 5 parts of brominated boron nitride were added to 50 parts of methanol aqueous solution, and 10 parts of modified ethylene-acrylic acid copolymer and copper bromide were added under nitrogen atmosphere; the reaction was carried out in the dark for 48 hours, washed and dried to obtain modified hexagonal boron nitride.

[0023] Example 1: A method for preparing a water-resistant aluminum-plastic composite tape for a cable, comprising the following steps: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 and pretreat for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 45 parts of ethylene-acrylic acid copolymer, 10 parts of GMA-EMA copolymer, 26 parts of low-density polyethylene, 19 parts of isocyanate-modified low-density polyethylene, 10 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0024] Example 2: A method for preparing a water-resistant aluminum-plastic composite tape for a cable, comprising the following steps: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 4:1; Step 2: 43 parts of ethylene-acrylic acid copolymer, 12 parts of GMA-EMA copolymer, 30 parts of low-density polyethylene, 15 parts of isocyanate-modified low-density polyethylene, 10 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip. Example 3: Example 1: A method for preparing a water-resistant aluminum-plastic composite tape for a cable, comprising the following steps: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 and pretreat for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 48 parts of ethylene-acrylic acid copolymer, 8 parts of GMA-EMA copolymer, 25 parts of low-density polyethylene, 18 parts of isocyanate-modified low-density polyethylene, 12 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0025] Comparative Example 1: Anodizing treatment was performed using a 5 wt% sulfuric acid-water solution; the rest was the same as in Example 1; specifically as follows: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% sulfuric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 45 parts of ethylene-acrylic acid copolymer, 10 parts of GMA-EMA copolymer, 26 parts of low-density polyethylene, 19 parts of isocyanate-modified low-density polyethylene, 10 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0026] Comparative Example 2: GMA-EMA copolymer was replaced by ethylene-acrylic acid copolymer, and isocyanate-modified low-density polyethylene was replaced by low-density polyethylene; the rest was the same as Example 1; the details are as follows: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 and pretreat for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 55 parts of ethylene-acrylic acid copolymer, 45 parts of low-density polyethylene, 10 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0027] Comparative Example 3: The isocyanate-modified low-density polyethylene was replaced with low-density polyethylene; the rest was the same as Example 1; the details are as follows: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 and pretreat for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 45 parts of ethylene-acrylic acid copolymer, 10 parts of GMA-EMA copolymer, 45 parts of low-density polyethylene, 10 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0028] Comparative Example 4: 10 parts of modified hexagonal boron nitride were replaced by 3 parts of modified hexagonal boron nitride; the rest was the same as Example 1; the details are as follows: Step 1: (1) Wipe the surface of an aluminum strip with a thickness of 0.15 mm with acetone, then place it in a 10 wt% perchloric acid-ethanol solution, use platinum foil as the counter electrode, set the current to 3 A at room temperature, electrolyze for 120 seconds, wash and dry; transfer it to a 5 wt% phosphoric acid-water solution, set the voltage to 50 V at room temperature, anodize for 100 minutes, wash and dry to obtain a pretreated aluminum strip; (2) Place the pretreated aluminum strip in an ethanol solution with a solid content of 10 wt% (50 wt% ethanol-water solution) with a volume ratio of 1:5 and pretreat for 4 hours to obtain an interface-modified aluminum strip; the silane coupling agent consists of a methyl methacrylate silane coupling agent KH570 and a mercapto silane coupling agent KH590 with a mass ratio of 5:1; Step 2: 45 parts of ethylene-acrylic acid copolymer, 10 parts of GMA-EMA copolymer, 26 parts of low-density polyethylene, 19 parts of isocyanate-modified low-density polyethylene, 3 parts of modified hexagonal boron nitride, 0.1 parts of peroxide initiator DCP, 0.2 parts of lubricant liquid paraffin, and 0.2 parts of antioxidant 1178 were mixed, and the mixture was milled at 140° C. for later use to obtain a polyolefin material; Step 3: Preheat the interface modified aluminum strip to 120°C, set a 0.1mm polyolefin material on the surface, hot-press and vulcanize it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes, cool it down, and trim it to obtain a water-resistant aluminum-plastic composite strip.

[0029] Performance Test 1: The water-resistant aluminum-plastic composite tapes prepared in the examples and comparative examples were subjected to relevant performance tests. Referring to the standard method of GB / T8808, the water-resistant aluminum-plastic composite tapes were subjected to a 180° peel test at a tensile rate of 300 mm / min to obtain the peel strength A. The tapes were then placed in 68°C water for 168 hours, and the peel strength B was further measured. The obtained data are shown in the following table:

[0030] Conclusion: The data in the above table show that this application effectively improves the interfacial strength and water resistance of the water-resistant aluminum-plastic composite tape by performing specific treatment on the aluminum tape and optimizing and modifying the polyolefin material components. In Comparative Example 1, the use of sulfuric acid-water solution anodizing treatment reduces the interfacial meshing and peel strength. In Comparative Example 2, the lack of the introduction of GMA-EMA copolymer and isocyanate-modified low-density polyethylene leads to a decrease in the degree of crosslinking, an increase in polar groups, and a decrease in water resistance. In Comparative Example 3, the lack of the introduction of isocyanate-modified low-density polyethylene leads to a decrease in peel strength and water resistance. In Comparative Example 4, the lack of modification of hexagonal boron nitride leads to a decrease in interfacial performance, affecting peel strength and water resistance.

[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a water-resistant aluminum-plastic composite tape for a cable, characterized in that: The following steps are involved: Step 1: (1) degreasing and electrolyzing the surface of the aluminum strip, and then anodizing it in a phosphoric acid solution to obtain a pretreated aluminum strip; (2) placing the pretreated aluminum strip in a coupling agent solution for pretreatment to obtain an interface-modified aluminum strip; Step 2: mixing ethylene-acrylic acid copolymer, GMA-EMA copolymer, low-density polyethylene, isocyanate-modified low-density polyethylene, modified hexagonal boron nitride, peroxide initiator, lubricant, and antioxidant, and refining for later use to obtain a polyolefin material; Step 3: preheating the interface modified aluminum strip, setting the polyolefin material on the surface, hot pressing and vulcanizing, cooling, and trimming to obtain a water-resistant aluminum-plastic composite strip.

2. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, characterized in that: The preparation method of the pretreated aluminum strip comprises: wiping the surface of the aluminum strip with acetone, then placing the surface of the aluminum strip in a 10-20wt% perchloric acid-ethanol solution, using a platinum foil as a counter electrode, setting a current of 2.5-3A at room temperature, performing electrolysis treatment for 120-150 seconds, washing, and drying; transferring the surface of the aluminum strip to a 5-6wt% phosphoric acid-water solution, setting a voltage of 40-60V at room temperature, anodizing for 60-120 minutes, washing, and drying to obtain the pretreated aluminum strip.

3. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, characterized in that: The coupling agent solution has a solid content of 10-12 wt% of an ethanol solution; the silane coupling agent includes a methacrylate silane coupling agent and a mercaptosilane coupling agent in a mass ratio of 4-5:1; and the volume ratio of the pretreated aluminum strip to the coupling agent solution is 1:4-6.

4. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, wherein: The raw materials of the polyolefin material include the following components: by weight, 43 to 48 parts of ethylene-acrylic acid copolymer, 8 to 12 parts of GMA-EMA copolymer, 25 to 30 parts of low-density polyethylene, 15 to 20 parts of isocyanate-modified low-density polyethylene, 9 to 12 parts of modified hexagonal boron nitride, 0.05 to 0.1 parts of peroxide initiator, 0.2 to 0.3 parts of lubricant, and 0.2 to 0.3 parts of antioxidant.

5. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, wherein: The preparation method of the isocyanate-modified low-density polyethylene comprises: adding low-density polyethylene to xylene, adding isocyanoethyl methacrylate and a peroxide initiator, setting the temperature at 120-125° C. for reaction for 4-5 hours under a nitrogen atmosphere, cooling, washing, and drying to obtain isocyanate-modified low-density polyethylene; the mass ratio of low-density polyethylene to isocyanoethyl methacrylate is 1:0.1-0.

2.

6. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, characterized in that: The preparation method of the modified hexagonal boron nitride is: (1) Hexagonal boron nitride and epoxysilane coupling agent are sequentially added to a 40-50% ethanol aqueous solution, stirred at 60-70°C for 24 hours, washed, and dried to obtain epoxide boron nitride; epoxide boron nitride is added to tetrahydrofuran, 4-aminobiphenyl and 3-amino-1-propanol are added, stirred at 60-70°C for 4-6 hours, washed, and dried to obtain intercalated boron nitride; intercalated boron nitride is uniformly dispersed in toluene, triethylamine is added and stirred evenly; bromoisobutyryl bromide-toluene solution is added dropwise under ice bath, stirred at room temperature overnight, centrifuged, washed, and dried to obtain bromoboron nitride; (2) Add ethylene-acrylic acid copolymer, triethylamine, and hydroquinone to DMF, raise the temperature to 50-60°C under a nitrogen atmosphere, add perillaldehyde-DMF solution dropwise, set the temperature to 65-80°C, react for 4-8 hours, wash, and dry to obtain a modified ethylene-acrylic acid copolymer; (3) Add bromo-boron nitride to a methanol aqueous solution, and then add a modified ethylene-acrylic acid copolymer and copper bromide under a nitrogen atmosphere; react in the dark for 48 hours, wash, and dry to obtain modified hexagonal boron nitride.

7. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 6, characterized in that: In the raw materials of the epoxidized boron nitride, the mass ratio of boron nitride to epoxysilane coupling agent is 1:0.2-0.5; in the raw materials of the intercalated boron nitride, the mass ratio of epoxidized boron nitride to 4-aminobiphenyl and 3-amino-1-propanol is 1:0.2-0.3:0.2-0.3; in the raw materials of the brominated boron nitride, the mass ratio of intercalated boron nitride to bromoisobutyryl bromide is 1:0.1-0.2; In the raw materials of the modified ethylene-acrylic acid copolymer, the mass ratio of the ethylene-acrylic acid copolymer to perillaldehyde is 1:0.2-0.3; In the raw materials of the modified hexagonal boron nitride, the mass ratio of bromine boron nitride to modified ethylene-acrylic acid copolymer is 1:

2.

8. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, characterized in that: The temperature of the open refining is 135-145° C.; the preheating temperature is 120-130° C.; the hot pressing vulcanization temperature is 160-180° C., the pressure is 8-12 MPa, and the time is 5-15 minutes.

9. The method for preparing a water-resistant aluminum-plastic composite tape for cables according to claim 1, characterized in that: The thickness of the aluminum strip is 0.1-0.2 mm; the thickness of the polyolefin material is 0.05-0.15 mm.

10. A water-resistant aluminum-plastic composite tape prepared according to the method for preparing a water-resistant aluminum-plastic composite tape for cables according to any one of claims 1 to 9.

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