A high-strength brushed aluminum-plastic composite panel and its processing technology

Abstract

The present invention discloses a high-strength brushed aluminum-plastic composite panel and its processing technology. The scheme uses brushed aluminum plates as the upper and lower aluminum plates, and melt-extrudes low-density polyethylene, polypropylene, ethylene-octene copolymer, flame-retardant titanium dioxide, graphene oxide, compatibilizer and other components to produce a core plate. During the composite process, the upper aluminum plate, the core plate, and the lower aluminum plate are arranged in the order of the upper aluminum plate, the core plate, and the lower aluminum plate. Polyethylene hot melt adhesive is applied between adjacent plates, and the panels are hot-pressed to form an aluminum-plastic composite panel. The aluminum-plastic composite panel has excellent flame retardant properties and excellent mechanical properties. This scheme discloses a high-strength brushed aluminum-plastic composite panel and its processing technology. The process design is reasonable, the proportions of the components are appropriate, and the prepared aluminum-plastic composite panel has excellent mechanical properties and excellent flame retardant properties. It can be widely used in fields such as home decoration and has high practicality.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-plastic composite panels, in particular to a high-strength wiredrawing aluminum-plastic composite panel and a processing technology thereof. Background Art

[0002] Aluminum-plastic composite panels, also known as aluminum-plastic panels, are a new type of decorative material. Since they were introduced to China from Germany in the late 1980s and early 1990s, they have quickly gained popularity due to their economy, variety of optional colors, convenient construction methods, excellent processing performance, excellent fire resistance and noble quality.

[0003] Aluminum-plastic composite panels are made of multiple layers of materials. The upper and lower layers are high-purity aluminum alloy plates, the middle layer is a non-toxic low-density polyethylene (PE) core plate, and a layer of protective film is pasted on the front. Nowadays, with the increasing application of aluminum-plastic panels, companies have higher requirements for the mechanical properties, flame retardancy and other properties of aluminum-plastic panels, which has also become our research and development focus.

[0004] Based on this situation, the present application discloses a high-strength brushed aluminum-plastic composite panel and a processing technology thereof to solve this technical problem. Summary of the Invention

[0005] The object of the present invention is to provide a high-strength brushed aluminum-plastic composite panel and a processing technology 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:

[0007] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0008] (1) mixing octafluoropentanol and tetrahydrofuran solution, stirring evenly to obtain octafluoropentanol solution; mixing metallic sodium and tetrahydrofuran solution, adding octafluoropentanol solution, stirring under ice-water bath until sodium completely disappears, obtaining tetrahydrofuran solution of sodium octafluoropentanolate;

[0009] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is heated at 30-35°C for 4-6 hours, then cooled to -5-5°C, ammonia gas is introduced, and the reaction is continued for 20-24 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene.

[0010] Mix 1,6-hexanediol glycidyl ether and aminocyclotriphosphazene, heat to 50-60°C, react for 30-40 minutes, add epoxidized titanium dioxide, and continue to react for 1-2 hours to obtain flame-retardant titanium dioxide;

[0011] (2) taking low-density polyethylene, polypropylene, ethylene-octene copolymer, flame-retardant titanium dioxide, graphene oxide, a compatibilizer, a silane coupling agent and an antioxidant, mixing and stirring them uniformly, and melt-extruding to obtain a core plate;

[0012] Take the brushed aluminum plate, clean and dry it and use it as the upper aluminum plate and the lower aluminum plate respectively. Stack the upper aluminum plate, core plate and lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press them to obtain the finished product.

[0013] In a more optimized solution, in step (2), the content of each component is: by mass, 50-55 parts of low-density polyethylene, 15-20 parts of polypropylene, 5-8 parts of ethylene-octene copolymer, 8-10 parts of flame-retardant titanium dioxide, 5-8 parts of graphene oxide, 5-6 parts of compatibilizer, 3-5 parts of silane coupling agent, and 2-3 parts of antioxidant.

[0014] In a more optimized scheme, in step (1), the preparation steps of epoxidized titanium dioxide are as follows: titanium dioxide and anhydrous ethanol are ultrasonically dispersed to obtain a titanium dioxide dispersion; anhydrous ethanol and deionized water are mixed, glacial acetic acid is added, the pH is adjusted to 5, KH-560 is added, and the mixture is stirred evenly, the titanium dioxide dispersion is added, and the mixture is stirred at 25-30°C for 20-24 hours, the product is collected by centrifugation, washed, and dried to obtain epoxidized titanium dioxide.

[0015] In a more optimized solution, in step (2), the core plate extrusion temperature is 180-200°C, the polyethylene hot melt adhesive thickness is 1.5-2 mm, the brushed aluminum plate thickness is 0.5 mm, and the core plate thickness is 3-5 mm.

[0016] In a more optimized solution, the preparation steps of the polyethylene hot melt adhesive are as follows:

[0017] S1: maleic anhydride, styrene, dicumyl peroxide and xylene are mixed and stirred, low-density polyethylene is added, and the mixture is heated to 130-135°C, kept warm for 2-3 hours, cooled to 70-80°C, precipitated with ethanol, filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene;

[0018] Maleic anhydride grafted polyethylene, acetone and deionized water were mixed, stirred for 20 to 24 hours, vacuum filtered and dried to obtain material A, material A was dissolved in acetone, bisphenol A epoxy resin was added, reacted at 25 to 30°C for 20 to 24 hours, and the acetone was evaporated to obtain a polyethylene copolymer;

[0019] S2: Take polyethylene copolymer, tackifying resin, polyethylene wax, maleic anhydride grafted polyethylene, flame retardant titanium dioxide, calcium carbonate, dibutyl phthalate and antioxidant, stir in an oil bath at 155-160° C. for 30-40 minutes, and solidify to obtain a polyethylene hot melt adhesive.

[0020] In a more optimized solution, in step S2, the contents of the components of the polyethylene hot melt adhesive are: by weight, 100-110 parts of polyethylene copolymer, 35-45 parts of tackifying resin, 10-12 parts of polyethylene wax, 100-110 parts of maleic anhydride grafted polyethylene, 20-30 parts of flame retardant titanium dioxide, 10-15 parts of calcium carbonate, 5-10 parts of dibutyl phthalate, and 3-5 parts of antioxidant.

[0021] In a more optimized solution, in step (1), the molar ratio of the aminocyclotriphosphazene, 1,6-hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:(6-7):1; the molar ratio of the hexachlorocyclotriphosphazene and sodium octafluoropentanoate is 1:1.

[0022] A more optimized solution is to obtain an aluminum-plastic composite panel by processing the high-strength brushed aluminum-plastic composite panel according to any one of the above processing techniques.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention discloses a high-strength brushed aluminum-plastic composite panel and a processing technology thereof. The scheme uses brushed aluminum plates as upper aluminum plates and lower aluminum plates, and melt-extrudes low-density polyethylene, polypropylene, ethylene-octene copolymer, flame-retardant titanium dioxide, graphene oxide, compatibilizer and other components to prepare a core plate. During compounding, polyethylene hot-melt adhesive is covered between adjacent plates in the order of upper aluminum plate, core plate and lower aluminum plate, and hot-pressed composite is performed to obtain an aluminum-plastic composite panel. The aluminum-plastic composite panel has relatively excellent flame retardant properties and excellent mechanical properties.

[0025] In the scheme, in order to improve the flame retardant performance of the core board, the scheme introduces flame retardant titanium dioxide into the core board. When preparing the flame retardant titanium dioxide, the scheme first uses octafluoropentanol and metallic sodium to react to generate sodium octafluoropentanoate, and then uses the P-Cl reaction of sodium octafluoropentanoate and hexachlorocyclotriphosphazene to generate cyclotriphosphazene containing fluorine element. The introduction of fluorine element can improve the hydrophobicity of the product to a certain extent, thereby reducing the water absorption rate of the product and increasing the service life of the product; and in order to avoid the introduction of too much fluorine element to affect the adhesion of the core board to the upper aluminum plate and the lower aluminum plate, the scheme limits "the molar ratio of the hexachlorocyclotriphosphazene and sodium octafluoropentanoate to 1:1" to ensure the comprehensive performance of the product.

[0026] On this basis, the scheme then introduces nitrogen to obtain aminocyclotriphosphazene, and then uses the amino group in aminocyclotriphosphazene to bond with the epoxy group, and reacts it with epoxidized titanium dioxide and 1,6-hexanediol glycidyl ether to obtain flame-retardant titanium dioxide; on the one hand, the grafting of aminocyclotriphosphazene on the surface of titanium dioxide can improve the dispersion performance of titanium dioxide, and on the other hand, the introduction of 1,6-hexanediol glycidyl ether can also improve the cross-linking between titanium dioxide and the various components of polyethylene, thereby improving the mechanical properties of the product.

[0027] When preparing flame-retardant titanium dioxide, the scheme also dopes it into polyethylene hot melt adhesive. The polyethylene hot melt adhesive is prepared with components such as polyethylene copolymer, tackifying resin, polyethylene wax, maleic anhydride grafted polyethylene, flame-retardant titanium dioxide, calcium carbonate, dibutyl phthalate and antioxidant. Among them, the polyethylene copolymer is obtained by copolymerizing maleic anhydride grafted polyethylene and epoxy resin, which can improve the adhesion of the hot melt adhesive. At the same time, the introduction of flame-retardant titanium dioxide can also improve the flame retardant properties of the product. It should be emphasized in this scheme: since the scheme introduces maleic anhydride grafted polyethylene and epoxy resin copolymer (polyethylene copolymer), the introduction of 1,6-hexanediol glycidyl ether in the flame-retardant titanium dioxide can improve the compatibility of titanium dioxide, thereby improving the comprehensive performance of the hot melt adhesive.

[0028] This proposal discloses a high-strength brushed aluminum-plastic composite panel and its processing technology. The process design is reasonable and the proportions of each component are appropriate. The prepared aluminum-plastic composite panel has excellent mechanical properties and excellent flame retardant properties. It can be widely used in fields such as home decoration and has high practicality. DETAILED DESCRIPTION

[0029] 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.

[0030] In this example, the preparation steps of epoxidized titanium dioxide are as follows: 5 g of titanium dioxide and 250 mL of anhydrous ethanol are ultrasonically dispersed for 10 minutes to obtain a titanium dioxide dispersion; the concentration of the titanium dioxide dispersion is 20 g / L; 150 mL of anhydrous ethanol and 20 mL of deionized water are mixed, glacial acetic acid is added to adjust the pH to 5, 10 g of KH-560 is added, and the mixture is stirred for 10 minutes. The titanium dioxide dispersion is then added, and the mixture is stirred at 25°C for 24 hours. The product is collected by centrifugation, washed, and dried to obtain epoxidized titanium dioxide. The mass ratio of titanium dioxide to KH-560 is 1:2.

[0031] In this embodiment, titanium dioxide was purchased from Chongqing Xinhua Chemical Plant; KH-560 was purchased from Sinopharm Chemical Reagent Co., Ltd.; octafluoropentanol was purchased from Shanghai Jiachen Chemical Co., Ltd.; hexachlorocyclotriphosphazene was purchased from Shanghai Wankai Chemical Co., Ltd.; 1,6-hexanediol glycidyl ether was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. (epoxy value 0.65-0.70); low-density polyethylene was purchased from Hyundai Petrochemical Co., Ltd. in South Korea (SR640); the tackifying resin was Ganges C5 petroleum resin, purchased from Shenzhen Xin Synthetic Rubber Trading Co., Ltd. (Shanna SN-243); the antioxidant was antioxidant 168; the silane coupling agent was KH-550; polypropylene and ethylene-octene copolymer were both purchased from Shanghai Puzhen Biotechnology Co., Ltd.

[0032] Example 1:

[0033] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0034] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0035] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0036] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is kept warm at 30°C for 6 hours, then cooled to -5°C, ammonia is introduced, and the reaction is continued for 24 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate is 1:1.

[0037] 1,6-Hexanediol glycidyl ether and aminocyclotriphosphazene are mixed, heated to 50° C., reacted for 40 minutes, epoxidized titanium dioxide is added, and the reaction is continued for 1 hour to obtain flame-retardant titanium dioxide; the molar ratio of the aminocyclotriphosphazene, 1,6-Hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:6:1.

[0038] (2) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of dicumyl peroxide, and 50 mL of xylene were mixed and stirred for 10 min, 10 g of low-density polyethylene was added, and the mixture was heated to 130°C and kept warm for 3 h. The mixture was cooled to 70°C and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0039] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 20h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 25°C for 24h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0040] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of flame retardant titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 155°C for 40min, and solidify to obtain a polyethylene hot melt adhesive.

[0041] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of flame-retardant titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0042] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 10 minutes, then place it in deionized water for ultrasonic cleaning for 10 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0043] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0044] Example 2:

[0045] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0046] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0047] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0048] Hexachlorocyclotriphosphazene and tetrahydrofuran were mixed and stirred until the hexachlorocyclotriphosphazene was completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate was added. The mixture was kept warm at 35°C for 5 hours, then cooled to 5°C, ammonia was introduced, and the reaction was continued for 22 hours. The product was collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate was 1:1.

[0049] 1,6-Hexanediol glycidyl ether and aminocyclotriphosphazene were mixed, heated to 55° C., reacted for 35 minutes, and epoxidized titanium dioxide was added. The reaction was continued for 1.5 hours to obtain flame-retardant titanium dioxide. The molar ratio of the aminocyclotriphosphazene, 1,6-Hexanediol glycidyl ether, and epoxidized titanium dioxide was 2:6:1.

[0050] (2) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of dicumyl peroxide, and 50 mL of xylene were mixed and stirred for 15 min, 10 g of low-density polyethylene was added, and the mixture was heated to 135°C and kept warm for 2.5 h. The mixture was cooled to 75°C and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0051] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 22h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 28°C for 22h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0052] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of flame retardant titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 160°C for 35min, and solidify to obtain a polyethylene hot melt adhesive.

[0053] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of flame-retardant titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0054] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 15 minutes, then place it in deionized water for ultrasonic cleaning for 15 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0055] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0056] Example 3:

[0057] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0058] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0059] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0060] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is kept warm at 35°C for 4 hours, then cooled to 5°C, ammonia is introduced, and the reaction is continued for 20 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate is 1:1.

[0061] 1,6-hexanediol glycidyl ether and aminocyclotriphosphazene are mixed, heated to 60° C., reacted for 30 minutes, epoxidized titanium dioxide is added, and the reaction is continued for 2 hours to obtain flame-retardant titanium dioxide; the molar ratio of the aminocyclotriphosphazene, 1,6-hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:7:1.

[0062] (2) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of diisopropylbenzene peroxide, and 50 mL of xylene were mixed and stirred for 15 min, 10 g of low-density polyethylene was added, and the mixture was heated to 135 ° C. and kept warm for 2 h. The mixture was cooled to 80 ° C. and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0063] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 24h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 30℃ for 20h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0064] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of flame retardant titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 160°C for 30min, and solidify to obtain a polyethylene hot melt adhesive.

[0065] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of flame-retardant titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0066] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 20 minutes, then place it in deionized water for ultrasonic cleaning for 20 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0067] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0068] Comparative Example 1: Example 3 was used as the control group. 1,6-hexanediol glycidyl ether was not introduced in Comparative Example 1, and the remaining steps remained unchanged.

[0069] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0070] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0071] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0072] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is kept warm at 35°C for 4 hours, then cooled to 5°C, ammonia is introduced, and the reaction is continued for 20 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate is 1:1.

[0073] The aminocyclotriphosphazene was heated to 60° C., and epoxidized titanium dioxide was added and reacted for 2 hours to obtain flame-retardant titanium dioxide; the molar ratio of the aminocyclotriphosphazene to the epoxidized titanium dioxide was 2:1.

[0074] (2) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of diisopropylbenzene peroxide, and 50 mL of xylene were mixed and stirred for 15 min, 10 g of low-density polyethylene was added, and the mixture was heated to 135 ° C. and kept warm for 2 h. The mixture was cooled to 80 ° C. and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0075] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 24h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 30℃ for 20h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0076] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of flame retardant titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 160°C for 30min, and solidify to obtain a polyethylene hot melt adhesive.

[0077] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of flame-retardant titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0078] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 20 minutes, then place it in deionized water for ultrasonic cleaning for 20 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0079] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0080] Comparative Example 2: Taking Example 3 as the control group, flame-retardant titanium dioxide was not introduced into the core board of Comparative Example 2, and only titanium dioxide was added, and the other steps remained unchanged.

[0081] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0082] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0083] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0084] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is kept warm at 35°C for 4 hours, then cooled to 5°C, ammonia is introduced, and the reaction is continued for 20 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate is 1:1.

[0085] 1,6-hexanediol glycidyl ether and aminocyclotriphosphazene are mixed, heated to 60° C., reacted for 30 minutes, epoxidized titanium dioxide is added, and the reaction is continued for 2 hours to obtain flame-retardant titanium dioxide; the molar ratio of the aminocyclotriphosphazene, 1,6-hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:7:1.

[0086] (2) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of diisopropylbenzene peroxide, and 50 mL of xylene were mixed and stirred for 15 min, 10 g of low-density polyethylene was added, and the mixture was heated to 135 ° C. and kept warm for 2 h. The mixture was cooled to 80 ° C. and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0087] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 24h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 30℃ for 20h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0088] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of flame retardant titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 160°C for 30min, and solidify to obtain a polyethylene hot melt adhesive.

[0089] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0090] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 20 minutes, then place it in deionized water for ultrasonic cleaning for 20 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0091] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0092] Comparative Example 3: Taking Comparative Example 2 as the control group, flame-retardant titanium dioxide was not introduced into the core board and polyethylene hot melt adhesive in Comparative Example 3. Only titanium dioxide was added, and the other steps remained unchanged.

[0093] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0094] (1) 0.8 g of maleic anhydride, 0.6 g of styrene, 0.2 g of diisopropylbenzene peroxide, and 50 mL of xylene were mixed and stirred for 15 min, 10 g of low-density polyethylene was added, and the mixture was heated to 135°C and kept warm for 2 h. The mixture was cooled to 80°C and precipitated with ethanol. The mixture was filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene.

[0095] Take 5g of maleic anhydride grafted polyethylene, 250mL of acetone and 250mL of deionized water, mix them, stir for 24h, vacuum filter and dry to obtain material A. Dissolve 10g of material A in acetone, add 0.5g of bisphenol A epoxy resin, react at 30℃ for 20h, evaporate and remove acetone to obtain a polyethylene copolymer; the mass of acetone is 200 times that of material A.

[0096] Take 100g of polyethylene copolymer, 40g of tackifying resin, 10g of polyethylene wax, 100g of maleic anhydride grafted polyethylene, 25g of titanium dioxide, 12g of calcium carbonate, 5g of dibutyl phthalate and 3g of antioxidant, stir in an oil bath at 160°C for 30min, and solidify to obtain a polyethylene hot melt adhesive.

[0097] (2) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0098] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 20 minutes, then place it in deionized water for ultrasonic cleaning for 20 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0099] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0100] Comparative Example 4: Taking Example 3 as a control, in Comparative Example 4, no polyethylene copolymer was introduced, and only low-density polyethylene was introduced.

[0101] A processing technology for producing a high-strength brushed aluminum-plastic composite panel comprises the following steps:

[0102] (1) Mix 99 g of octafluoropentanol and 50 mL of tetrahydrofuran solution and stir evenly to obtain an octafluoropentanol solution;

[0103] 9 g of metallic sodium and 100 mL of tetrahydrofuran solution were mixed, octafluoropentanol solution was added, and the mixture was stirred in an ice-water bath until the sodium completely disappeared to obtain a tetrahydrofuran solution of sodium octafluoropentanol; the mass ratio of the octafluoropentanol to metallic sodium was 11:1.

[0104] Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is kept warm at 35°C for 4 hours, then cooled to 5°C, ammonia is introduced, and the reaction is continued for 20 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene; the molar ratio of the hexachlorocyclotriphosphazene to sodium octafluoropentanolate is 1:1.

[0105] 1,6-hexanediol glycidyl ether and aminocyclotriphosphazene are mixed, heated to 60° C., reacted for 30 minutes, epoxidized titanium dioxide is added, and the reaction is continued for 2 hours to obtain flame-retardant titanium dioxide; the molar ratio of the aminocyclotriphosphazene, 1,6-hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:7:1.

[0106] (2) Take 100 g of linear low-density polyethylene, 40 g of tackifying resin, 10 g of polyethylene wax, 100 g of maleic anhydride-grafted polyethylene, 25 g of flame-retardant titanium dioxide, 12 g of calcium carbonate, 5 g of dibutyl phthalate and 3 g of antioxidant, stir in an oil bath at 160°C for 30 min, and solidify to obtain a polyethylene hot melt adhesive.

[0107] (3) Take 50 kg of low-density polyethylene, 20 kg of polypropylene, 8 kg of ethylene-octene copolymer, 10 kg of flame-retardant titanium dioxide, 8 kg of graphene oxide, 5 kg of compatibilizer, 5 kg of silane coupling agent and 3 kg of antioxidant, mix and stir evenly, melt and extrude to obtain a core plate; the core plate extrusion temperature is 200 °C.

[0108] Take a brushed aluminum plate, place it in an acetone solution for ultrasonic cleaning for 20 minutes, then place it in deionized water for ultrasonic cleaning for 20 minutes, and blow dry; take the brushed aluminum plate as the upper aluminum plate and the lower aluminum plate respectively, stack the upper aluminum plate, the core plate, and the lower aluminum plate in order, bond the adjacent plates with polyethylene hot melt adhesive, and hot press composite to obtain a finished product.

[0109] The brushed aluminum plate is a commercially available aluminum plate with a thickness of 0.5 mm. The core plate is 5 mm thick; and the polyethylene hot melt adhesive is 1.5 mm thick.

[0110] Detection experiment:

[0111] 1. The core boards prepared in Examples 1-3 and Comparative Examples 1-2 were tested for mechanical and flame retardant properties. The tensile strength was tested according to the method disclosed in GB / T1040.2-2006, "Determination of Tensile Properties - Part 2: Test Conditions for Molded and Extruded Plastics." The oxygen index was tested according to the method disclosed in GB / T2406.1-2008. The water absorption (boiling water, 30 minutes) was tested according to the method disclosed in GB / T1034-1998.

[0112]

[0113]

[0114] 2. The aluminum-plastic composite panels prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were tested for flame retardancy according to the method disclosed in GB / T8624-2012, and the peel strength of the hot melt adhesive was tested according to the method disclosed in GB / T2790.

[0115] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Flame retardant grade A-level A-level A-level A-level Level B1 Level B1 A-level Peel strength 18N / cm 19N / cm 19N / cm 15N / cm 18N / cm 12N / cm 16N / cm

[0116] Conclusion: This proposal discloses a high-strength brushed aluminum-plastic composite panel and its processing technology. The process design is reasonable and the proportions of each component are appropriate. The prepared aluminum-plastic composite panel has excellent mechanical properties and excellent flame retardant properties. It can be widely used in home decoration and other fields and has high practicality.

[0117] 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 processing technology for high-strength brushed aluminum-plastic composite panels, characterized by: The following steps are involved: (1) Mix octafluoropentanol and tetrahydrofuran solution, stir evenly to obtain octafluoropentanol solution; mix metallic sodium and tetrahydrofuran solution, add octafluoropentanol solution, and stir in an ice-water bath until sodium completely disappears to obtain a tetrahydrofuran solution of sodium octafluoropentanolate; Hexachlorocyclotriphosphazene and tetrahydrofuran are mixed and stirred until the hexachlorocyclotriphosphazene is completely dissolved, and a tetrahydrofuran solution of sodium octafluoropentanolate is added. The mixture is heated at 30-35°C for 4-6 hours, then cooled to -5-5°C, ammonia gas is introduced, and the reaction is continued for 20-24 hours. The product is collected, washed, and dried to obtain aminocyclotriphosphazene. Mix 1,6-hexanediol glycidyl ether and aminocyclotriphosphazene, heat to 50-60°C, react for 30-40 minutes, add epoxidized titanium dioxide, and continue to react for 1-2 hours to obtain flame-retardant titanium dioxide; (2) low-density polyethylene, polypropylene, ethylene-octene copolymer, flame-retardant titanium dioxide, graphene oxide, compatibilizer, silane coupling agent and antioxidant are mixed and stirred evenly, and melt-extruded to obtain a core plate; Take the brushed aluminum plate, clean and dry it, and use it as the upper aluminum plate and the lower aluminum plate respectively. The upper aluminum plate, the core plate and the lower aluminum plate are stacked in order. The adjacent plates are bonded with polyethylene hot melt adhesive and hot pressed to obtain the finished product. The preparation steps of the epoxidized titanium dioxide are as follows: titanium dioxide and anhydrous ethanol are ultrasonically dispersed to obtain a titanium dioxide dispersion; anhydrous ethanol and deionized water are mixed, glacial acetic acid is added, the pH is adjusted to 5, KH-560 is added, and the mixture is stirred evenly; the titanium dioxide dispersion is added, and the mixture is stirred at 25-30° C. for 20-24 hours, the product is collected by centrifugation, washed, and dried to obtain the epoxidized titanium dioxide; The preparation steps of the polyethylene hot melt adhesive are: S1: maleic anhydride, styrene, dicumyl peroxide and xylene are mixed and stirred, low-density polyethylene is added, and the mixture is heated to 130-135°C, kept warm for 2-3 hours, cooled to 70-80°C, precipitated with ethanol, filtered, washed, and dried to obtain maleic anhydride-grafted polyethylene; Maleic anhydride grafted polyethylene, acetone and deionized water were mixed, stirred for 20 to 24 hours, vacuum filtered and dried to obtain material A, material A was dissolved in acetone, bisphenol A epoxy resin was added, reacted at 25 to 30°C for 20 to 24 hours, and the acetone was evaporated to obtain a polyethylene copolymer; S2: Take polyethylene copolymer, tackifying resin, polyethylene wax, maleic anhydride grafted polyethylene, flame retardant titanium dioxide, calcium carbonate, dibutyl phthalate and antioxidant, stir in an oil bath at 155-160°C for 30-40 minutes, and cure to obtain polyethylene hot melt adhesive; In step (1), the molar ratio of the aminocyclotriphosphazene, 1,6-hexanediol glycidyl ether, and epoxidized titanium dioxide is 2:(6-7):1; the molar ratio of the hexachlorocyclotriphosphazene and sodium octafluoropentanoate is 1:

1.

2. The processing technology of a high-strength brushed aluminum-plastic composite panel according to claim 1, characterized in that: In step (2), the content of each component is: by mass, 50-55 parts of low-density polyethylene, 15-20 parts of polypropylene, 5-8 parts of ethylene-octene copolymer, 8-10 parts of flame-retardant titanium dioxide, 5-8 parts of graphene oxide, 5-6 parts of compatibilizer, 3-5 parts of silane coupling agent, and 2-3 parts of antioxidant.

3. The processing technology of a high-strength brushed aluminum-plastic composite panel according to claim 1, characterized in that: In step (2), the core plate extrusion temperature is 180-200° C., the thickness of the polyethylene hot melt adhesive is 1.5-2 mm, the thickness of the brushed aluminum plate is 0.5 mm, and the thickness of the core plate is 3-5 mm.

4. The processing technology of a high-strength brushed aluminum-plastic composite panel according to claim 1, characterized in that: In step S2, the contents of the components of the polyethylene hot melt adhesive are as follows: by weight, 100-110 parts of polyethylene copolymer, 35-45 parts of tackifying resin, 10-12 parts of polyethylene wax, 100-110 parts of maleic anhydride grafted polyethylene, 20-30 parts of flame retardant titanium dioxide, 10-15 parts of calcium carbonate, 5-10 parts of dibutyl phthalate, and 3-5 parts of antioxidant.

5. An aluminum-plastic composite panel obtained by processing the high-strength wire drawing aluminum-plastic composite panel according to any one of claims 1 to 4.

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