High-strength SPC foamed aluminum composite board

Abstract

The invention discloses a high-strength SPC foamed aluminum composite board, and belongs to the technical field of aluminum composite board preparation. The high-strength SPC foamed aluminum composite plate comprises an aluminum foil plate, a foaming layer, a composite layer and a protective layer, the surface of the aluminum foil plate is sequentially covered with the foaming layer, the composite layer and the protective layer, the aluminum foil plate and the composite layer are bonded through the foaming layer, the surface of the composite layer is covered with the protective layer in a spraying mode, and the foaming layer is made of 3, 4, 9, 10-tetramethyl-3, 4, 5-tetramethyl-3, 5-tetramethyl-3, 5-tetramethyl-3, 5-tetramethyl-3, 5-tetramethyl-3, 5-tetramethyl-3, 5-tetramethyl-3 the protective layer is prepared from 1, 10-tetracarboxylic anhydride, propyl alcohol, decamethylcyclopentasiloxane, 1, 1, 3, 3-tetramethyldisiloxane, hexamethyldisilazane, vinylethylene carbonate and poly (dimethyl siloxane), the composite layer is prepared from polyvinyl chloride and calcium powder, and the protective layer is prepared from octafluoropentanol, epichlorohydrin, perfluoropolyether carboxylic acid and N, N-dimethylsiloxane. The composite board prepared by the method disclosed by the invention has the advantages of excellent strength and excellent waterproof performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of the preparation of aluminum composite plates, and particularly relates to a high-strength SPC foamed aluminum composite plate. Background Art

[0002] With the acceleration of the global industrialization process and the improvement of people's requirements for the quality of life, the building materials industry is facing unprecedented changes. Traditional building materials, such as wood, stone, ceramics, etc., although having their own advantages, have deficiencies in terms of environmental protection, durability, lightweight, etc. Therefore, the development of a new type of high-strength building material has become an urgent need in the industry.

[0003] SPC, that is, stone plastic composite material, is mainly composed of renewable resources such as polyvinyl chloride resin and calcium powder, and has environmental protection characteristics such as no soluble volatiles and no radiation. At the same time, SPC plates are thin, light, wear-resistant, corrosion-resistant, and are easy to be processed into various shapes and sizes, which provides the possibility for the diversification of building materials. And foamed aluminum materials have been widely used in the fields of construction, transportation, cold chain, etc. due to their light weight, heat insulation, fire prevention and other characteristics. Combining SPC with foamed aluminum to form an SPC foamed aluminum composite plate can not only give full play to the advantages of both, but also further improve the overall performance of the material.

[0004] Patent CN220167341U discloses a lightweight foamed aluminum-plastic composite plate, including: a plate body structure and a connection structure. The plate body structure includes an aluminum foil bottom plate, an aluminum foil face plate, a PE foamed core material, a polymer film and a protective film. The polymer film is connected to the upper end of the aluminum foil bottom plate, the PE foamed core material is connected to the upper end of the polymer film, and the other end of the PE foamed core material is also connected with a layer of polymer film. The aluminum foil face plate is connected to the upper end of the polymer film, and the protective film is connected to the upper end of the aluminum foil face plate; the connection structure includes trapezoidal notch and trapezoidal connection strips respectively arranged on the left and right side walls of the PE foamed profile. The trapezoidal notch and the trapezoidal connection strip are mutually matched and inserted for the connection of multiple aluminum-plastic composite plates. The composite plate has excellent stability and does not affect the overall vision, but there is still room for improvement in the strength, flame retardant performance and waterproof performance of the composite plate prepared by this method. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength SPC foamed aluminum composite plate to solve the technical problems of poor strength, flame retardant performance and waterproof performance of the composite plate in the prior art.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions: The present invention provides a high-strength SPC foamed aluminum composite board, which includes an aluminum foil board, a foaming layer, a composite layer and a protective layer. The surface of the aluminum foil board is sequentially covered with the foaming layer, the composite layer and the protective layer. The foaming layer bonds the aluminum foil board and the composite layer, and the protective layer is covered on the surface of the composite layer by spraying. Among them, the foaming layer material is prepared from 3,4,9,10-pyromellitic dianhydride, propanol, decamethylcyclopentasiloxane, 1,1,3,3-tetramethyldisiloxane, hexamethyldisilazane, ethylene carbonate and poly(dimethylsiloxane). The composite layer material is prepared from polyvinyl chloride and calcium powder. The protective layer material is prepared from octafluoropentanol, epichlorohydrin, perfluoropolyether carboxylic acid and N,N'-dicyclohexylcarbodiimide.

[0007] Preferably, the preparation method of the foaming layer material includes the following steps: Q1: Add N,N-dimethylformamide into a container, heat it in an oil bath, start magnetic stirring, then add 3,4,9,10-pyromellitic dianhydride into the container, stir until it is completely dissolved, stop stirring, cool down, and add propanol dropwise into the container by using a constant pressure dropping funnel, and stir to obtain a precursor mixed solution; Q2: Add decamethylcyclopentasiloxane and trifluoromethanesulfonic acid into a container, stir, then add 1,1,3,3-tetramethyldisiloxane, react at room temperature under a nitrogen atmosphere, after the reaction is completed, add hexamethyldisilazane, then add anhydrous magnesium sulfate, continue to stir and then let it stand, filter, and distill under reduced pressure to obtain intermediate 1; Q3: Add intermediate 1, toluene and KARSTEDT catalyst into a container, heat and react under a nitrogen atmosphere, then add ethylene carbonate, continue to heat and react, spin evaporate after the reaction is completed to obtain intermediate 2, add anhydrous ethanol to intermediate 2, stir and then add isophorone diamine, and stir at room temperature to obtain intermediate 3; Q4: Add the precursor mixed solution, dibutyltin dilaurate, poly(dimethylsiloxane) and deionized water into a container, stir, then add intermediate 3, and continue to stir to obtain the foaming layer material.

[0008] In the above process, N,N-dimethylformamide is used as a solvent, 3,4,9,10-pyromellitic dianhydride and propanol undergo an esterification reaction to obtain a precursor mixed solution, and then, using decamethylcyclopentasiloxane, 1,1,3,3-tetramethyldisiloxane and hexamethyldisilazane as raw materials, an ring-opening reaction occurs under the condition of trifluoromethanesulfonic acid as a catalyst to obtain intermediate 1. Subsequently, intermediate 1, ethylene carbonate and isophorone diamine undergo an ring-opening reaction to obtain intermediate 3. Finally, under the catalytic action of dibutyltin dilaurate, the precursor mixed solution and intermediate 3 are compounded to obtain the foaming layer material.

[0009] Preferably, in Q1, the dosage ratio of N,N-dimethylformamide, 3,4,9,10-pyromellitic dianhydride and propanol is (100 - 120) mL : (90 - 110) g : (30 - 45) mL. The oil bath heating temperature is 140 - 160 °C, the magnetic stirring speed is 150 - 200 rpm, and it is stirred for 30 - 45 min until completely dissolved. Then it is cooled to 65 - 70 °C, the time for dropping propanol is 3 - 5 min, and the stirring time is 5 - 10 min.

[0010] Preferably, in Q2, the dosage ratio of decamethylcyclopentasiloxane, trifluoromethanesulfonic acid, 1,1,3,3-tetramethyldisiloxane, hexamethyldisilazane and anhydrous magnesium sulfate is (200 - 240) g : (0.6 - 0.8) g : (32 - 34.12) g : (2.24 - 2.6) g : (2 - 2.5) g. The stirring time is 15 - 20 min, the room temperature reaction time is 24 - 30 h, the continued stirring time is 8 - 10 h, and the standing time is 10 - 12 h; in Q3, the dosage ratio of intermediate 1, toluene, KARSTEDT catalyst and ethylene carbonate is (50 - 60) g : (50 - 75) mL : (0.2 - 0.25) g : (13 - 14.12) g. The temperature for the first-stage heating reaction is 60 - 65 °C, and the temperature for the continued heating reaction is 80 - 90 °C. The dosage ratio of intermediate 2, absolute ethanol and isophoronediamine is (10 - 12) g : (2 - 2.5) mL : (1 - 1.4) g, and the room temperature stirring time is 5 - 8 min.

[0011] Preferably, in Q4, the dosage ratio of the precursor mixture, dibutyltin dilaurate, poly(dimethylsiloxane), deionized water and intermediate 3 is (80 - 100) g : (0.8 - 1.2) g : (1 - 2) g : (1 - 4) mL : (45 - 55) g. The stirring speed is 300 - 350 rpm, the stirring time is 2 - 4 min, and the continued stirring speed is 400 - 420 rpm, and the stirring time is 20 - 25 s.

[0012] Preferably, the preparation method of the protective layer material comprises the following steps: S1: Add sodium hydroxide, octafluoropentanol, toluene and tetrabutylammonium bromide into a container. After stirring at room temperature, dropwise add epichlorohydrin dissolved in toluene, heat and stir for reaction. After the reaction is completed, wash, let it stand for liquid separation, dry the organic phase, filter, perform vacuum distillation, and obtain fluorinated alcohol after rectification and purification; S2: Add the fluoroalcohol and perfluoropolyether carboxylic acid into a container, add tetrahydrofuran and 1,3-bis(trifluoromethyl)benzene, stir, and then, under a nitrogen atmosphere, dropwise add N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of tetrahydrofuran and 1,3-bis(trifluoromethyl)benzene. After reacting at low temperature and then at room temperature, after the reaction ends, filter, rotary evaporate, dissolve, precipitate, and dry to obtain the protective layer material.

[0013] In the above process, the synthesis reaction formula of the protective layer material is as follows: The mass spectrometry analysis result of the fluoroalcohol is: m / z: 520.05 (100.0%), 521.06 (14.3%), 522.06(1.6%).

[0014] Preferably, in the above S1, the dosage ratio of sodium hydroxide, octafluoropentanol, toluene, tetrabutylammonium bromide, toluene dissolving epichlorohydrin, and epichlorohydrin is (40 - 52) g : (240 - 287.4) g : (400 - 600) mL : (0.8 - 1.2) g : (90 - 110) mL : (40 - 52.6) g. The stirring time at room temperature is 30 - 45 min, the heating and stirring reaction temperature is 70 - 75 °C, the reaction time is 10 - 12 h, wash with distilled water, and dry the organic phase with anhydrous sodium sulfate.

[0015] Preferably, in the above S2, the dosage ratio of the fluoroalcohol, perfluoropolyether carboxylic acid, and N,N'-dicyclohexylcarbodiimide is (2.8 - 3.4) g : (1 - 1.6) g : (0.3 - 0.38) g. The low-temperature reaction temperature is 0 - 1 °C, the reaction time is 1 - 2 h, the room-temperature reaction time is 20 - 24 h, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and the drying temperature is 40 - 50 °C.

[0016] Preferably, a preparation method of a high-strength SPC foamed aluminum composite board includes the following steps: Step 1: Add the prepared foamed layer material onto the surface of an aluminum foil board, conduct foaming, and then mix polyvinyl chloride and calcium powder and compound them with the foamed foamed layer material, and cure at high temperature to obtain an aluminum foil board with a foamed layer; Step 2: Ultrasonically disperse the protective layer material in distilled water, spray it onto the surface of the foamed layer, and dry to obtain the high-strength SPC foamed aluminum composite board.

[0017] Preferably, in the first step, the dosage ratio of polyvinyl chloride to calcium powder is (30 - 45) g : (54 - 81) g, the high-temperature curing temperature is 180 - 200 °C, and the curing time is 2 - 4 h; in the second step, the dosage ratio of the protective layer material to distilled water is (8 - 12) g : (50 - 60) mL.

[0018] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. First, using 3,4,9,10 - tetracarboxylic dianhydride, propanol, decamethylcyclopentasiloxane, 1,1,3,3 - tetramethyldisiloxane, hexamethyldisilazane, ethylene carbonate and poly(dimethylsiloxane) as raw materials, a foaming layer material is prepared. Subsequently, using octafluoropentanol, epichlorohydrin, perfluoropolyether carboxylic acid and N,N'-dicyclohexylcarbodiimide as raw materials, a composite layer material is prepared. Applying the foaming layer material and the composite layer material to the SPC foamed aluminum composite board at the same time can effectively improve its strength and waterproof performance.

[0019] 2. Applying the prepared foaming layer material to the SPC foamed aluminum composite board can effectively improve its strength. The organic and inorganic compounds in the foaming layer material are tightly combined through chemical bonding and physical interweaving, so that the foaming layer material has excellent mechanical properties and stability. When the foaming layer material covers the surface of the aluminum foil board, it is combined by chemical bonding and physical adsorption to form a complete whole, so that it can jointly bear external forces, disperse and transfer stress, and thus has high strength.

[0020] 3. Applying the prepared protective layer material to the SPC foamed aluminum composite board can effectively improve its waterproof performance. The introduction of fluorine atoms can effectively reduce the surface tension of the protective layer material, making it not easily wetted by water, increasing the contact angle of water molecules on the material surface, reducing the penetration opportunity of water molecules, and the fluorocarbon chain segments contained can form a stable hydrophobic layer, effectively preventing the penetration and diffusion of water molecules, so that the protective layer material can still maintain the stability and durability of its performance in a humid environment and increase the moisture-proof performance. Specific Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Example 1: This example provides a preparation method of a foaming layer material, including the following steps: Q1: Add 110 mL of N,N-dimethylformamide into a container, heat it in an oil bath at 160 °C, start magnetic stirring at a speed of 200 rpm, then add 100 g of 3,4,9,10-tetracarboxylic dianhydride into the container. After stirring for 45 min until completely dissolved, stop stirring, cool down to 65 °C, and add 37.5 mL of propanol dropwise into the container using a constant pressure dropping funnel over 3 min. Stir for 10 min to obtain a precursor mixture solution; Q2: Add 220 g of decamethylcyclopentasiloxane and 0.7 g of trifluoromethanesulfonic acid into a container. After stirring for 20 min, add 33.06 g of 1,1,3,3-tetramethyldisiloxane and react at room temperature for 24 h under a nitrogen atmosphere. After the reaction is completed, add 2.42 g of hexamethyldisilazane, then add 2.25 g of anhydrous magnesium sulfate, continue stirring for 8 h and then let it stand for 12 h. Filter and perform vacuum distillation to obtain intermediate 1; Q3: Add 55 g of intermediate 1, 62.5 mL of toluene and 0.22 g of KARSTEDT catalyst into a container, heat and react at 65 °C under a nitrogen atmosphere, then add 13.56 g of ethylene carbonate and heat and react at 85 °C. After the reaction is completed, perform rotary evaporation to obtain intermediate 2. Add 2.25 mL of anhydrous ethanol to 11 g of intermediate 2, stir and then add 1.2 g of isophorone diamine, and stir at room temperature for 8 min to obtain intermediate 3; Q4: Add 90 g of the precursor mixture solution, 1 g of dibutyltin dilaurate, 1.5 g of poly(dimethylsiloxane) and 2.5 mL of deionized water into a container, stir at 350 rpm for 4 min, then add 50 g of intermediate 3 and continue stirring at 420 rpm for 25 s to obtain a foaming layer material.

[0023] This example discloses a preparation method of a protective layer material, including the following steps: S1: Add 46 g of sodium hydroxide, 263.7 g of octafluoropentanol, 500 mL of toluene and 1 g of tetrabutylammonium bromide into a container. After stirring at room temperature for 45 min, gradually add 46.3 g of epichlorohydrin dissolved in 100 mL of toluene, heat and stir at 75 °C for 12 h. After the reaction is completed, wash with distilled water, let it stand for liquid separation, dry the organic phase with anhydrous sodium sulfate, filter, perform vacuum distillation, and obtain fluorinated alcohol after rectification and purification; S2: Add 3.1 g of fluorinated alcohol and 1.3 g of perfluoropolyether carboxylic acid into a container, add 8 mL of tetrahydrofuran and 4 mL of 1,3-bis(trifluoromethyl)benzene, stir, and then, under a nitrogen atmosphere, dropwise add 0.34 g of N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of 4 mL of tetrahydrofuran and 2 mL of 1,3-bis(trifluoromethyl)benzene. After reacting at a low temperature of 0 °C for 1 h, react at room temperature for 24 h. After the reaction ends, filter, rotary evaporate, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and dry at 45 °C to obtain the protective layer material.

[0024] This example discloses a preparation method of a high-strength SPC foamed aluminum composite board, including the following steps: Step 1: Add the prepared foamed layer material onto the surface of the aluminum foil board, conduct foaming, and then mix 37.5 g of polyvinyl chloride and 73 g of calcium powder, and compound them with the foamed foamed layer material, and cure at a high temperature of 180 °C for 4 h to obtain an aluminum foil board with a foamed layer. Step 2: Ultrasonically disperse 10 g of the protective layer material in 55 mL of distilled water, spray it onto the surface of the foamed layer, and dry to obtain the high-strength SPC foamed aluminum composite board.

[0025] Example 2: This example provides a preparation method of a foamed layer material, including the following steps: Q1: Add 120 mL of N,N-dimethylformamide into a container, heat it in an oil bath at 160 °C, turn on magnetic stirring with a rotation speed of 200 rpm, and then add 90 g of 3,4,9,10-pyromellitic dianhydride into the container. After stirring for 45 min until completely dissolved, stop stirring, cool down to 65 °C, and dropwise add 45 mL of propanol into the container using a constant pressure dropping funnel. The dropping time is 3 min, and stir for 10 min to obtain a precursor mixture. Q2: Add 240 g of decamethylcyclopentasiloxane and 0.8 g of trifluoromethanesulfonic acid into a container, stir for 20 min, then add 34.12 g of 1,1,3,3-tetramethyldisiloxane, react at room temperature for 24 h under a nitrogen atmosphere. After the reaction ends, add 2.6 g of hexamethyldisilazane, then add 2.5 g of anhydrous magnesium sulfate, continue to stir for 8 h, then let it stand for 12 h, filter, and distill under reduced pressure to obtain Intermediate 1. Q3: Add 50 g of Intermediate 1, 50 mL of toluene, and 0.2 g of KARSTEDT catalyst into a container, heat and react at 65 °C under a nitrogen atmosphere, then add 13 g of ethylene carbonate, heat and react at 85 °C. After the reaction ends, rotary evaporate to obtain Intermediate 2. Add 2.5 mL of anhydrous ethanol to 10 g of Intermediate 2, stir, then add 1.4 g of isophorone diamine, and stir at room temperature for 8 min to obtain Intermediate 3. Q4: Add 80 g of the precursor mixture, 1.2 g of dibutyltin dilaurate, 1 g of poly(dimethylsiloxane), and 1 mL of deionized water into a container, stir at 350 rpm for 4 min, then add 45 g of Intermediate 3, and continue to stir at 420 rpm for 25 s to obtain the foamed layer material.

[0026] This example discloses a preparation method of a protective layer material, including the following steps: S1: Add 40 g of sodium hydroxide, 240 g of octafluoropentanol, 600 mL of toluene, and 0.8 tetrabutylammonium bromide into a container. After stirring at room temperature for 45 min, gradually add dropwise 40 g of epichlorohydrin dissolved in 90 mL of toluene, heat and stir the reaction at 75 °C for 12 h. After the reaction is completed, wash with distilled water, let it stand for liquid separation, dry the organic phase with anhydrous sodium sulfate, filter, distill under reduced pressure, and obtain the fluorinated alcohol after rectification and purification. S2: Add 2.8 g of the fluorinated alcohol and 1.6 g of perfluoropolyether carboxylic acid into a container, add 8 mL of tetrahydrofuran and 4 mL of 1,3-bis(trifluoromethyl)benzene, stir, and then, under a nitrogen atmosphere, dropwise add 0.38 g of N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of 4 mL of tetrahydrofuran and 2 mL of 1,3-bis(trifluoromethyl)benzene. After reacting at 0 °C for 1 h, react at room temperature for 24 h. After the reaction is completed, filter, rotary evaporate, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and dry at 45 °C to obtain the protective layer material.

[0027] This example discloses a preparation method of a high-strength SPC foamed aluminum composite board, including the following steps: Step 1: Add the prepared foamed layer material onto the surface of the aluminum foil board, carry out foaming, then mix 30 g of polyvinyl chloride and 81 g of calcium powder, and compound them with the foamed foamed layer material, and cure at 180 °C for 4 h to obtain an aluminum foil board with a foamed layer. Step 2: Ultrasonically disperse 12 g of the protective layer material in 50 mL of distilled water, spray it onto the surface of the foamed layer, and dry it to obtain the high-strength SPC foamed aluminum composite board.

[0028] Example 3: This example provides a preparation method of a foamed layer material, including the following steps: Q1: Add 100 mL of N,N-dimethylformamide into a container, heat it in an oil bath at 160 °C, turn on magnetic stirring, and the rotation speed is 200 rpm. Then add 110 g of 3,4,9,10-pyromellitic dianhydride into the container. After stirring for 45 min until completely dissolved, stop stirring, cool down to 65 °C, and dropwise add 30 mL of propanol into the container through a constant pressure dropping funnel. The dropping time is 3 min, and stir for 10 min to obtain the precursor mixture. Q2: Add 200 g of decamethylcyclopentasiloxane and 0.6 g of trifluoromethanesulfonic acid into a container. After stirring for 20 min, add 32 g of 1,1,3,3-tetramethyldisiloxane. React at room temperature for 24 h under a nitrogen atmosphere. After the reaction, add 2.24 g of hexamethyldisilazane, then add 2 g of anhydrous magnesium sulfate, continue to stir for 8 h, and then let it stand for 12 h. Filter and distill under reduced pressure to obtain Intermediate 1; Q3: Add 60 g of Intermediate 1, 75 mL of toluene and 0.25 g of KARSTEDT catalyst into a container. Under a nitrogen atmosphere, heat and react at 65 °C, then add 14.12 g of ethylene carbonate. Heat and react at 85 °C. After the reaction, perform rotary evaporation to obtain Intermediate 2. Add 2 mL of anhydrous ethanol to 12 g of Intermediate 2, stir, then add 1 g of isophoronediamine, and stir at room temperature for 8 min to obtain Intermediate 3; Q4: Add 100 g of the precursor mixture, 0.8 g of dibutyltin dilaurate, 2 g of poly(dimethylsiloxane) and 4 mL of deionized water into a container. Stir at 350 rpm for 4 min, then add 55 g of Intermediate 3, and continue to stir at 420 rpm for 25 s to obtain the foamed layer material.

[0029] This example discloses a preparation method of a protective layer material, including the following steps: S1: Add 52 g of sodium hydroxide, 287.4 g of octafluoropentanol, 400 mL of toluene and 1.2 g of tetrabutylammonium bromide into a container. After stirring at room temperature for 45 min, gradually add 52.6 g of epichlorohydrin dissolved in 100 mL of toluene. Heat and stir at 75 °C for 12 h. After the reaction, wash with distilled water, let it stand for liquid separation, dry the organic phase with anhydrous sodium sulfate, filter, distill under reduced pressure, and perform rectification and purification to obtain fluorinated alcohol; S2: Add 3.4 g of fluorinated alcohol and 1 g of perfluoropolyether carboxylic acid into a container. Add 8 mL of tetrahydrofuran and 4 mL of 1,3-bis(trifluoromethyl)benzene, stir, and then under a nitrogen atmosphere, dropwise add 0.3 g of N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of 4 mL of tetrahydrofuran and 2 mL of 1,3-bis(trifluoromethyl)benzene. React at 0 °C for 1 h and then at room temperature for 24 h. After the reaction, filter, perform rotary evaporation, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and dry at 45 °C to obtain the protective layer material.

[0030] This example discloses a preparation method of a high-strength SPC foamed aluminum composite board, including the following steps: Step 1: Add the prepared foamed layer material onto the surface of the aluminum foil board and foam it. Then mix 45 g of polyvinyl chloride and 54 g of calcium powder, and compound them with the foamed foamed layer material. Cure at 180 °C for 4 h to obtain an aluminum foil board with a foamed layer; Step 2: Ultrasonically disperse 8 g of the protective layer material in 60 mL of distilled water, spray it onto the surface of the foaming layer, and dry it to obtain a high-strength SPC foamed aluminum composite board.

[0031] Example 4: This example provides a method for preparing a foaming layer material, which includes the following steps: Q1: Add 105 mL of N,N-dimethylformamide to a container, heat it in an oil bath at 160 °C, turn on magnetic stirring with a rotation speed of 200 rpm, then add 105 g of 3,4,9,10-pyromellitic dianhydride to the container, stir for 45 min until completely dissolved, stop stirring, cool down to 65 °C, and add 32 mL of propanol dropwise to the container using a constant pressure dropping funnel over 3 min, stir for 10 min to obtain a precursor mixture. Q2: Add 210 g of decamethylcyclopentasiloxane and 0.65 g of trifluoromethanesulfonic acid to a container, stir for 20 min, then add 32.71 g of 1,1,3,3-tetramethyldisiloxane, react at room temperature for 24 h under a nitrogen atmosphere. After the reaction, add 2.32 g of hexamethyldisilazane, then add 2.1 g of anhydrous magnesium sulfate, continue to stir for 8 h and then let it stand for 12 h, filter, and carry out vacuum distillation to obtain Intermediate 1. Q3: Add 52 g of Intermediate 1, 55 mL of toluene, and 0.21 g of KARSTEDT catalyst to a container, heat and react at 65 °C under a nitrogen atmosphere, then add 13.28 g of ethylene carbonate, heat and react at 85 °C. After the reaction, carry out rotary evaporation to obtain Intermediate 2. Add 2.1 mL of anhydrous ethanol to 10.5 g of Intermediate 2, stir, then add 1.3 g of isophorone diamine, and stir at room temperature for 8 min to obtain Intermediate 3. Q4: Add 85 g of the precursor mixture, 0.9 g of dibutyltin dilaurate, 1.1 g of poly(dimethylsiloxane), and 2 mL of deionized water to a container, stir at 350 rpm for 4 min, then add 47.5 g of Intermediate 3, and continue to stir at 420 rpm for 25 s to obtain the foaming layer material.

[0032] This example discloses a method for preparing a protective layer material, which includes the following steps: S1: Add 42 g of sodium hydroxide, 250 g of octafluoropentanol, 450 mL of toluene, and 0.9 g of tetrabutylammonium bromide to a container, stir at room temperature for 45 min, then gradually add 45.3 g of epichlorohydrin dissolved in 100 mL of toluene, heat and stir at 75 °C for 12 h. After the reaction, wash with distilled water, let it stand for liquid separation, dry the organic phase with anhydrous sodium sulfate, filter, carry out vacuum distillation, and obtain the fluorinated alcohol after rectification and purification. S2: Add 2.9 g of fluorinated alcohol and 1.2 g of perfluoropolyether carboxylic acid into a container, add 8 mL of tetrahydrofuran and 4 mL of 1,3-bis(trifluoromethyl)benzene, stir, and then, under a nitrogen atmosphere, dropwise add 0.32 g of N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of 4 mL of tetrahydrofuran and 2 mL of 1,3-bis(trifluoromethyl)benzene. After reacting at a low temperature of 0 °C for 1 h, react at room temperature for 24 h. After the reaction is completed, filter, rotary evaporate, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and dry at 45 °C to obtain the protective layer material.

[0033] This example discloses a preparation method of a high-strength SPC foamed aluminum composite board, including the following steps: Step 1: Add the prepared foamed layer material onto the surface of an aluminum foil board, conduct foaming, and then mix 35 g of polyvinyl chloride and 62 g of calcium powder, and compound them with the foamed foamed layer material, and cure at a high temperature of 180 °C for 4 h to obtain an aluminum foil board with a foamed layer. Step 2: Ultrasonically disperse 9 g of the protective layer material in 52 mL of distilled water, spray it onto the surface of the foamed layer, and dry it to obtain a high-strength SPC foamed aluminum composite board.

[0034] Example 5: This example provides a preparation method of a foamed layer material, including the following steps: Q1: Add 115 mL of N,N-dimethylformamide into a container, heat it in an oil bath at 160 °C, turn on magnetic stirring with a rotation speed of 200 rpm, and then add 95 g of 3,4,9,10-pyromellitic dianhydride into the container. After stirring for 45 min until completely dissolved, stop stirring, cool down to 65 °C, and use a constant pressure dropping funnel to dropwise add 42 mL of propanol into the container. The dropping time is 3 min, and stir for 10 min to obtain a precursor mixture. Q2: Add 230 g of decamethylcyclopentasiloxane and 0.75 g of trifluoromethanesulfonic acid into a container, stir for 20 min, then add 33.98 g of 1,1,3,3-tetramethyldisiloxane, react at room temperature for 24 h under a nitrogen atmosphere. After the reaction is completed, add 2.58 g of hexamethyldisilazane, then add 2.4 g of anhydrous magnesium sulfate, continue to stir for 8 h, then let it stand for 12 h, filter, and distill under reduced pressure to obtain intermediate 1. Q3: Add 58 g of intermediate 1, 70 mL of toluene, and 0.24 g of KARSTEDT catalyst into a container, heat and react at 65 °C under a nitrogen atmosphere, then add 14.07 g of ethylene carbonate, heat and react at 85 °C. After the reaction is completed, rotary evaporate to obtain intermediate 2. Add 2.4 mL of anhydrous ethanol to 11.5 g of intermediate 2, stir, then add 1.1 g of isophorone diamine, and stir at room temperature for 8 min to obtain intermediate 3. Q4: Add 95 g of the precursor mixture, 1.1 g of dibutyltin dilaurate, 1.9 g of poly(dimethylsiloxane), and 3 mL of deionized water into a container, stir at 350 rpm for 4 min, then add 52.5 g of Intermediate 3, and continue to stir at 420 rpm for 25 s to obtain the foamed layer material.

[0035] This example discloses a preparation method of a protective layer material, including the following steps: S1: Add 50 g of sodium hydroxide, 277.3 g of octafluoropentanol, 550 mL of toluene, and 1.1 g of tetrabutylammonium bromide into a container. After stirring at room temperature for 45 min, gradually add 51.7 g of epichlorohydrin dissolved in 95 mL of toluene. Heat and stir the reaction at 75 °C for 12 h. After the reaction ends, wash with distilled water, let it stand for liquid separation, dry the organic phase with anhydrous sodium sulfate, filter, distill under reduced pressure, and purify by rectification to obtain the fluorinated alcohol. S2: Add 3.3 g of the fluorinated alcohol and 1.4 g of perfluoropolyether carboxylic acid into a container, add 8 mL of tetrahydrofuran and 4 mL of 1,3-bis(trifluoromethyl)benzene, stir, and then, under a nitrogen atmosphere, dropwise add 0.36 g of N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of 4 mL of tetrahydrofuran and 2 mL of 1,3-bis(trifluoromethyl)benzene. React at a low temperature of 0 °C for 1 h, then react at room temperature for 24 h. After the reaction ends, filter, perform rotary evaporation, dissolve with tetrahydrofuran, precipitate in anhydrous methanol, and dry at 45 °C to obtain the protective layer material.

[0036] This example discloses a preparation method of a high-strength SPC foamed aluminum composite board, including the following steps: Step 1: Add the prepared foamed layer material onto the surface of the aluminum foil board, perform foaming, then mix 42 g of polyvinyl chloride and 79 g of calcium powder, and compound them with the foamed foamed layer material. Cure at a high temperature of 180 °C for 4 h to obtain an aluminum foil board with a foamed layer. Step 2: Ultrasonically disperse 11 g of the protective layer material in 58 mL of distilled water, spray it onto the surface of the foamed layer, and dry to obtain the high-strength SPC foamed aluminum composite board.

[0037] Comparative Example 1: Compared with Example 1, in Comparative Example 1, during the preparation of the foamed layer material, 3,4,9,10-pyromellitic dianhydride is not added, and other conditions remain unchanged.

[0038] Comparative Example 2: Compared with Example 1, in Comparative Example 2, during the preparation of the protective layer material, perfluoropolyether carboxylic acid is not added, and other conditions remain unchanged.

[0039] Comparative Example 3: Compared with Example 1, in Comparative Example 3, during the preparation of the high-strength SPC foamed aluminum composite board, the foamed layer material is not added, and other conditions remain unchanged.

[0040] Comparative Example 4: Compared with Example 1, in the process of preparing the high-strength SPC foamed aluminum composite board in Comparative Example 4, the protective layer material is not added, and other conditions remain unchanged.

[0041] Experimental Example: The high-strength SPC foamed aluminum composite boards prepared in Examples 1-5 and Comparative Examples 1-4 were subjected to performance measurement. According to GB / T 17657-2013, the strength and moisture-proof performance of the samples were tested, and the test results are shown in Table 1: As can be seen from the test results in Table 1, the high-strength SPC foamed aluminum composite boards prepared in Examples 1-5 of the present invention have excellent strength and moisture-proof performance. By comparing Comparative Example 1 with Examples 1-5, it can be seen that adding 3,4,9,10-tetracarboxylic anhydride can effectively improve the strength of the SPC foamed aluminum composite board; by comparing Comparative Example 2 with Examples 1-5, it can be seen that adding perfluoropolyether carboxylic acid can effectively improve the moisture-proof performance of the SPC foamed aluminum composite board; by comparing Comparative Example 3 with Examples 1-5, it can be seen that adding the foaming layer material can effectively improve the strength of the SPC foamed aluminum composite board; by comparing Comparative Example 4 with Examples 1-5, it can be seen that adding the protective layer material can effectively improve the moisture-proof performance of the SPC foamed aluminum composite board.

[0042] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high-strength SPC foamed aluminum composite panel, characterized in that: The invention comprises an aluminum foil plate, a foaming layer, a composite layer and a protective layer. The surface of the aluminum foil plate is sequentially covered with the foaming layer, the composite layer and the protective layer. The foaming layer bonds the aluminum foil plate and the composite layer. The protective layer is covered on the surface of the composite layer by spraying. The foaming layer material is prepared from 3,4,9,10-tetracarboxylic anhydride, propanol, decamethylcyclopentasiloxane, 1,1,3,3-tetramethyldisiloxane, hexamethyldisilazane, vinyl ethylene carbonate and poly(dimethylsiloxane). The composite layer material is prepared from polyvinyl chloride and calcium powder. The protective layer material is prepared from octafluoropentanol, epichlorohydrin, perfluoropolyether carboxylic acid and N,N'-dicyclohexylcarbodiimide.

2. A high-strength SPC foamed aluminum composite panel according to claim 1, characterized in that: The method for preparing the foaming layer material comprises the following steps: Q1: Add N,N-dimethylformamide to a container, heat in an oil bath, start magnetic stirring, then add 3,4,9,10-tetracarboxylic anhydride to the container, stir until completely dissolved, stop stirring, cool down, and add propanol dropwise to the container using a constant pressure dropping funnel, stir, and obtain a precursor mixture; Q2: Add decamethylcyclopentasiloxane and trifluoromethanesulfonic acid to a container, stir, then add 1,1,3,3-tetramethyldisiloxane, react at room temperature under a nitrogen atmosphere, add hexamethyldisilazane after the reaction, then add anhydrous magnesium sulfate, continue stirring, let stand, filter, and distill under reduced pressure to obtain intermediate 1; Q3: Add intermediate 1, toluene and KARSTEDT catalyst into a container, heat up the reaction under a nitrogen atmosphere, then add ethylene carbonate, continue to heat up the reaction, and after the reaction is completed, perform rotary evaporation to obtain intermediate 2, add anhydrous ethanol to intermediate 2, add isophorone diamine after stirring, and stir at room temperature to obtain intermediate 3; Q4: Add the precursor mixture, dibutyltin dilaurate, poly(dimethylsiloxane) and deionized water into a container, stir, then add the intermediate 3, continue stirring, and obtain a foaming layer material.

3. A high-strength SPC foamed aluminum composite panel according to claim 2, characterized in that: In the Q1, the dosage ratio of N,N-dimethylformamide, 3,4,9,10-tetracarboxylic anhydride and propanol is (100-120) mL: (90-110) g: (30-45) mL, the oil bath heating temperature is 140-160° C., the magnetic stirring speed is 150-200 rpm, stirring for 30-45 min until completely dissolved, cooling to 65-70° C., the time for dripping propanol is 3-5 min, and the stirring time is 5-10 min.

4. The high-strength SPC foamed aluminum composite panel according to claim 2, characterized in that: In Q2, the dosage ratio of decamethylcyclopentasiloxane, trifluoromethanesulfonic acid, 1,1,3,3-tetramethyldisiloxane, hexamethyldisilazane and anhydrous magnesium sulfate is (200-240) g: (0.6-0.8) g: (32-34.12) g: (2.24-2.6) g: (2-2.5) g, the stirring time is 15-20 min, the reaction time at room temperature is 24-30 h, the continued stirring time is 8-10 h, and the standing time is 10-12 h; in Q3 The amount ratio of intermediate 1, toluene, KARSTEDT catalyst and vinyl ethylene carbonate is (50-60) g: (50-75) mL: (0.2-0.25) g: (13-14.12) g, the reaction temperature is 60-65°C, and the reaction temperature is continued to be 80-90°C. The amount ratio of intermediate 2, anhydrous ethanol and isophorone diamine is (10-12) g: (2-2.5) mL: (1-1.4) g, and the stirring time at room temperature is 5-8 min.

5. The high-strength SPC foamed aluminum composite panel according to claim 2, characterized in that: In the Q4, the amount ratio of the precursor mixture, dibutyltin dilaurate, poly(dimethylsiloxane), deionized water and intermediate 3 is (80-100) g: (0.8-1.2) g: (1-2) g: (1-4) mL: (45-55) g, the stirring speed is 300-350 rpm, the stirring time is 2-4 min, and the stirring speed is continued to be 400-420 rpm, and the stirring time is 20-25 s.

6. The high-strength SPC foamed aluminum composite panel according to claim 1, characterized in that: The method for preparing the protective layer material comprises the following steps: S1: Sodium hydroxide, octafluoropentanol, toluene and tetrabutylammonium bromide are added to a container, stirred at room temperature, and then epichlorohydrin dissolved in toluene is added dropwise, heated and stirred for reaction, and after the reaction is completed, the mixture is washed, allowed to stand for separation, and the organic phase is dried, filtered, and distilled under reduced pressure to obtain a fluorine-containing alcohol after rectification and purification; S2: Add fluorinated alcohol and perfluoropolyether carboxylic acid into a container, add tetrahydrofuran and 1,3-bis(trifluoromethyl)benzene, stir, and then under a nitrogen atmosphere, drop N,N'-dicyclohexylcarbodiimide dissolved in a mixed solution of tetrahydrofuran and 1,3-bis(trifluoromethyl)benzene, react at low temperature, then react at room temperature, filter, rotary evaporate, dissolve, precipitate, and dry to obtain a protective layer material.

7. The high-strength SPC foamed aluminum composite panel according to claim 6, characterized in that: In the S1, the amount ratio of sodium hydroxide, octafluoropentanol, toluene, tetrabutylammonium bromide, toluene for dissolving epichlorohydrin and epichlorohydrin is (40-52) g: (240-287.4) g: (400-600) mL: (0.8-1.2) g: (90-110) mL: (40-52.6) g, the stirring time at room temperature is 30-45 min, the heating and stirring reaction temperature is 70-75° C., the reaction time is 10-12 h, the reaction is washed with distilled water, and the organic phase is dried with anhydrous sodium sulfate.

8. The high-strength SPC foamed aluminum composite panel according to claim 6, characterized in that: In the S2, the amount ratio of fluorinated alcohol, perfluoropolyether carboxylic acid and N,N'-dicyclohexylcarbodiimide is (2.8-3.4) g: (1-1.6) g: (0.3-0.38) g, the low-temperature reaction temperature is 0-1°C, the reaction time is 1-2h, the room temperature reaction time is 20-24h, it is dissolved in tetrahydrofuran, precipitated in anhydrous methanol, and the drying temperature is 40-50°C.

9. A method for preparing a high-strength SPC foamed aluminum composite panel according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: adding the prepared foaming layer material to the surface of the aluminum foil plate to foam, then mixing polyvinyl chloride and calcium powder, compounding with the foamed foaming layer material, and curing at high temperature to obtain an aluminum foil plate containing a foaming layer; Step 2: Ultrasonic dispersion of the protective layer material into distilled water, spraying onto the surface of the foaming layer, and drying to obtain a high-strength SPC foamed aluminum composite panel.

10. The method for preparing a high-strength SPC foamed aluminum composite panel according to claim 9, characterized in that: In the step 1, the usage ratio of polyvinyl chloride and calcium powder is (30-45) g: (54-81) g, the high temperature curing time is 180-200° C., and the curing time is 2-4 hours. In the step 2, the usage ratio of the protective layer material and distilled water is (8-12) g: (50-60) mL.

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