Method for preparing composite board of evacuation platform with fire-proof function

Abstract

The present invention discloses a method for preparing a composite board for an evacuation platform with fireproofing function. The board is prepared by pelletizing, melt extruding, pulling, and cutting a carbon nanotube-glass fiber composite, a polyamide resin, ammonium polyphosphate, and an antioxidant. The glass fiber is loaded with imidazole copper coated with aluminum oxide. The imidazole copper can synergistically act with the ammonium polyphosphate to promote the formation of a carbon layer, thereby improving the flame retardancy of the composite board. At the same time, the aluminum oxide coating improves the insulation of the composite board. The composite board prepared according to the method provided by the present invention has good flame retardancy and load-bearing performance and is suitable for tunnel evacuation platforms.

Description

Technical Field

[0001] The invention relates to the technical field of composite panels, in particular to a method for preparing a composite panel for an evacuation platform with a fireproofing function. Background Art

[0002] With the rapid development and continuous improvement of my country's subway system rail transit facilities in recent years, the demand for composite panels for subway tunnel evacuation platforms has also increased. These composite panels are usually made of resin and have high strength to support the heavy weight required for evacuation. To ensure the safety of evacuees, the composite panels also need to be added with flame retardants to improve their flame resistance.

[0003] In order to improve the strength, flame retardancy and insulation of the evacuation platform composite board, the present invention provides a method for preparing the evacuation platform composite board with fire prevention function. Summary of the Invention

[0004] The object of the present invention is to provide a method for preparing a composite board for an evacuation platform with a fireproof function, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for preparing a composite board for an evacuation platform with a fireproof function comprises the following steps:

[0007] Step 1: Take imidazole copper coated with alumina and deionized water, stir for 1-2 hours, add glass fiber, and continue stirring at 45-55°C for 1-2 hours to prepare modified glass fiber;

[0008] Step 2: Take the treated carbon nanotubes and ethanol, stir for 1-2 hours, add modified glass fiber, react at 45-55°C for 3-4 hours, filter, wash, and dry to obtain a carbon nanotube-glass fiber composite;

[0009] Step 3: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and antioxidant, mix them evenly, extrude, cool, pelletize, dry, melt at 220-260° C., extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0010] More optimally, the composite board comprises the following components: by weight, 100-120 parts of polyamide resin, 40-50 parts of carbon nanotube-glass fiber composite, 15-25 parts of ammonium polyphosphate, and 0.5-1 part of antioxidant.

[0011] More optimally, the antioxidant is a phosphite antioxidant.

[0012] More optimally, in step 1, the preparation method of imidazole copper coated with alumina comprises the following steps:

[0013] S1: Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8-9 to prepare a buffer solution, add dopamine to prepare a dopamine solution, take the dopamine solution, add imidazole copper, stir for 40-48 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0014] S2: Take dopamine-coated imidazole copper and deionized water, stir evenly, add aluminum oxide, continue stirring for 2.5-3.5 hours, filter, and vacuum dry for 5-6 hours to obtain aluminum oxide-coated imidazole copper.

[0015] More optimally, in S2, the mass ratio of the dopamine-coated copper imidazole to alumina is 1:(2.5-4).

[0016] More optimally, the preparation method of the imidazole copper is as follows: take copper acetate and deionized water, stir evenly to obtain a mixed solution; take sodium bicarbonate, imidazole, and deionized water, stir evenly, continue stirring at 95-105°C for 10-20 minutes, add the mixed solution dropwise, heat to react for 50-70 minutes, cool to 25-35°C, stir for 68-74 hours, and dry to obtain the imidazole copper.

[0017] More optimally, in step 2, the preparation method of the treated carbon nanotubes is: take carbon nanotubes, nitric acid, and hydrogen peroxide, ultrasonically treat for 40-60 minutes, react at 100-110°C for 3-4 hours, filter, wash, and dry to obtain carboxylated carbon nanotubes; take carboxylated carbon nanotubes, 4-dimethylaminopyridine, N,N'-dicyclohexylcarboximide, silane coupling agent, 500mL of tetrahydrofuran, ultrasonically disperse for 2-3 hours, filter, wash, and dry to obtain treated carbon nanotubes.

[0018] More optimally, the silane coupling agent is KH550.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention utilizes the adhesion of dopamine to coat a layer of aluminum oxide with good insulation properties on the surface of flame-retardant imidazole copper, thereby improving the insulation properties of the composite board. At the same time, ammonium polyphosphate is added to the composite board substrate. When burning, ammonium polyphosphate will decompose, expand and foam due to heat, forming an expanded carbonized layer, and can release non-combustible gas, giving the board flame retardancy. Imidazole copper has good thermal stability and has a certain smoke suppression effect on the board. The two work synergistically to promote the formation of the carbon layer and improve the flame retardancy of the composite board. The mass ratio of imidazole copper coated with dopamine and aluminum oxide is controlled to be 1: (2.5-4), at which time the composite board has the best flame retardancy.

[0021] (2) Alumina-coated imidazole copper is loaded onto glass fiber to produce modified glass fiber, preventing it from settling in the system and unevenly dispersing, which would affect its performance. The modified glass fiber is reacted with carbon nanotubes. The carbon nanotubes enhance the flame retardancy of the modified glass fiber. At the same time, the grafting of glass fiber also improves the problem of easy agglomeration of carbon nanotubes, making the resulting composite board have a high strength that meets the requirements for use in subway tunnel evacuation platforms. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] Step 1: Preparation of copper imidazole:

[0025] Take 10g of copper acetate and 100mL of deionized water, stir evenly to obtain a mixed solution; take 31g of sodium bicarbonate, 10g of imidazole, and 300mL of deionized water, stir evenly, continue stirring at 100℃ for 15min, add the mixed solution dropwise, heat to react for 60min, cool to 30℃, stir for 70h, and dry to obtain imidazole copper.

[0026] Step 2: Preparation of imidazole copper coated with alumina:

[0027] Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8.5 to prepare a buffer solution, add dopamine to prepare a dopamine solution with a concentration of 2.5 g / L, take 60 mL of dopamine solution, add 3 g of imidazole copper, stir for 44 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0028] Take 2.5 g of dopamine-coated imidazole copper and 100 mL of deionized water, stir evenly, add 7.5 g of aluminum oxide, continue stirring for 3 hours, filter, and vacuum dry for 5.5 hours to obtain aluminum oxide-coated imidazole copper.

[0029] The mass ratio of imidazole copper and alumina coated with dopamine is 1:3.

[0030] Step 3: Preparation of modified carbon nanotubes:

[0031] Take 3 g of alumina-coated imidazole copper and 100 mL of deionized water, stir for 1.5 h, add 5 g of glass fiber, and continue stirring at 50 ° C for 1.5 h to prepare modified glass fiber;

[0032] Take 1g of carbon nanotubes, 5mL of nitric acid, and 15mL of hydrogen peroxide, ultrasonically treat for 50min, react at 105℃ for 3.5h, filter, wash, and dry to obtain carboxylated carbon nanotubes;

[0033] 0.5 g of carboxylated carbon nanotubes, 0.1 g of 4-dimethylaminopyridine, 0.7 g of N, N'-dicyclohexylcarboximide, 0.3 g of silane coupling agent KH550, and 500 mL of tetrahydrofuran were ultrasonically dispersed for 2.5 h, filtered, washed, and dried to obtain treated carbon nanotubes;

[0034] 0.1 g of the treated carbon nanotubes and 100 mL of ethanol were stirred for 1.5 h, 12 g of modified glass fiber was added, and the mixture was reacted at 50° C. for 3.5 h. The mixture was filtered, washed, and dried to obtain a carbon nanotube-glass fiber composite.

[0035] Step 4: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0036] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0037] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0038] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0039] The composite board includes the following components: by weight, 110 parts of polyamide resin, 45 parts of carbon nanotube-glass fiber composite, 20 parts of ammonium polyphosphate, and 0.7 parts of tris(2,4-di-tert-butylphenyl)phosphite.

[0040] Example 2

[0041] Step 1: Preparation of copper imidazole:

[0042] Take 10g of copper acetate and 100mL of deionized water, stir evenly to obtain a mixed solution; take 31g of sodium bicarbonate, 10g of imidazole, and 300mL of deionized water, stir evenly, continue stirring at 95°C for 10min, add the mixed solution dropwise, heat to react for 50min, cool to 25°C, stir for 68h, and dry to obtain imidazole copper.

[0043] Step 2: Preparation of imidazole copper coated with alumina:

[0044] Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8, prepare a buffer solution, add dopamine, and prepare a dopamine solution with a concentration of 2.5 g / L. Take 60 mL of the dopamine solution, add 3 g of imidazole copper, stir for 40 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0045] Take 2.5 g of dopamine-coated imidazole copper and 100 mL of deionized water, stir evenly, add 6.25 g of aluminum oxide, continue stirring for 2.5 hours, filter, and vacuum dry for 5 hours to obtain aluminum oxide-coated imidazole copper.

[0046] The mass ratio of imidazole copper and alumina coated with dopamine is 1:2.5.

[0047] Step 3: Preparation of modified carbon nanotubes:

[0048] Take 3 g of alumina-coated imidazole copper and 100 mL of deionized water, stir for 1 h, add 5 g of glass fiber, and continue stirring at 45 ° C for 1 h to prepare modified glass fiber;

[0049] Take 1g of carbon nanotubes, 5mL of nitric acid, and 15mL of hydrogen peroxide, ultrasonically treat for 40min, react at 100℃ for 3h, filter, wash, and dry to obtain carboxylated carbon nanotubes;

[0050] 0.5 g of carboxylated carbon nanotubes, 0.1 g of 4-dimethylaminopyridine, 0.7 g of N,N'-dicyclohexylcarboximide, 0.3 g of silane coupling agent KH550, and 500 mL of tetrahydrofuran were ultrasonically dispersed for 2 h, filtered, washed, and dried to obtain treated carbon nanotubes;

[0051] 0.1 g of the treated carbon nanotubes and 100 mL of ethanol were taken, stirred for 1 h, 12 g of modified glass fiber was added, and the mixture was reacted at 45° C. for 3 h. The mixture was filtered, washed, and dried to obtain a carbon nanotube-glass fiber composite.

[0052] Step 4: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0053] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0054] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0055] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0056] The composite board includes the following components: by weight, 100 parts of polyamide resin, 40 parts of carbon nanotube-glass fiber composite, 15 parts of ammonium polyphosphate, and 0.5 parts of tris(2,4-di-tert-butylphenyl)phosphite.

[0057] Example 3

[0058] Step 1: Preparation of copper imidazole:

[0059] Take 10g of copper acetate and 100mL of deionized water, stir evenly to obtain a mixed solution; take 31g of sodium bicarbonate, 10g of imidazole, and 300mL of deionized water, stir evenly, continue stirring at 105°C for 20min, add the mixed solution dropwise, heat to react for 70min, cool to 35°C, stir for 74h, and dry to obtain imidazole copper.

[0060] Step 2: Preparation of imidazole copper coated with alumina:

[0061] Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 9 to prepare a buffer solution, add dopamine to prepare a dopamine solution with a concentration of 2.5 g / L, take 60 mL of dopamine solution, add 3 g of imidazole copper, stir for 48 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0062] Take 2.5 g of dopamine-coated imidazole copper and 100 mL of deionized water, stir evenly, add 10 g of aluminum oxide, continue stirring for 3.5 hours, filter, and vacuum dry for 6 hours to obtain aluminum oxide-coated imidazole copper.

[0063] The mass ratio of imidazole copper coated with dopamine to alumina is 1:4.

[0064] Step 3: Preparation of modified carbon nanotubes:

[0065] Take 3 g of alumina-coated imidazole copper and 100 mL of deionized water, stir for 2 h, add 5 g of glass fiber, and continue stirring at 55 ° C for 2 h to prepare modified glass fiber;

[0066] Take 1g of carbon nanotubes, 5mL of nitric acid, and 15mL of hydrogen peroxide, ultrasonically treat for 60min, react at 110℃ for 4h, filter, wash, and dry to obtain carboxylated carbon nanotubes;

[0067] 0.5 g of carboxylated carbon nanotubes, 0.1 g of 4-dimethylaminopyridine, 0.7 g of N, N'-dicyclohexylcarboximide, 0.3 g of silane coupling agent KH550, and 500 mL of tetrahydrofuran were ultrasonically dispersed for 3 h, filtered, washed, and dried to obtain treated carbon nanotubes;

[0068] 0.1 g of the treated carbon nanotubes and 100 mL of ethanol were taken, stirred for 2 h, 12 g of modified glass fiber was added, and the mixture was reacted at 55° C. for 4 h. The mixture was filtered, washed, and dried to obtain a carbon nanotube-glass fiber composite.

[0069] Step 4: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0070] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0071] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0072] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0073] The composite board includes the following components: by weight, 120 parts of polyamide resin, 50 parts of carbon nanotube-glass fiber composite, 25 parts of ammonium polyphosphate, and 1 part of tris(2,4-di-tert-butylphenyl)phosphite.

[0074] Example 4: No imidazole copper is added, and the rest is the same as Example 1.

[0075] Step 1: Preparation of modified carbon nanotubes:

[0076] Take 1g of carbon nanotubes, 5mL of nitric acid, and 15mL of hydrogen peroxide, ultrasonically treat for 50min, react at 105℃ for 3.5h, filter, wash, and dry to obtain carboxylated carbon nanotubes;

[0077] 0.5 g of carboxylated carbon nanotubes, 0.1 g of 4-dimethylaminopyridine, 0.7 g of N, N'-dicyclohexylcarboximide, 0.3 g of silane coupling agent KH550, and 500 mL of tetrahydrofuran were ultrasonically dispersed for 2.5 h, filtered, washed, and dried to obtain treated carbon nanotubes;

[0078] 0.1 g of the treated carbon nanotubes and 100 mL of ethanol were taken, stirred for 1.5 h, 12 g of glass fiber was added, and the mixture was reacted at 50° C. for 3.5 h. The mixture was filtered, washed, and dried to obtain a carbon nanotube-glass fiber composite.

[0079] Step 4: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0080] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0081] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0082] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0083] The composite board includes the following components: by weight, 110 parts of polyamide resin, 45 parts of carbon nanotube-glass fiber composite, 20 parts of ammonium polyphosphate, and 0.7 parts of tris(2,4-di-tert-butylphenyl)phosphite.

[0084] Example 5: The mass ratio of imidazole copper coated with dopamine to aluminum oxide was controlled to be 1:7, and the rest was the same as in Example 1.

[0085] Step 1: Preparation of copper imidazole:

[0086] Take 10g of copper acetate and 100mL of deionized water, stir evenly to obtain a mixed solution; take 31g of sodium bicarbonate, 10g of imidazole, and 300mL of deionized water, stir evenly, continue stirring at 100℃ for 15min, add the mixed solution dropwise, heat to react for 60min, cool to 30℃, stir for 70h, and dry to obtain imidazole copper.

[0087] Step 2: Preparation of imidazole copper coated with alumina:

[0088] Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8.5 to prepare a buffer solution, add dopamine to prepare a dopamine solution with a concentration of 2.5 g / L, take 60 mL of dopamine solution, add 3 g of imidazole copper, stir for 44 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0089] Take 2.5 g of dopamine-coated imidazole copper and 100 mL of deionized water, stir evenly, add 17.5 g of aluminum oxide, continue stirring for 3 hours, filter, and vacuum dry for 5.5 hours to obtain aluminum oxide-coated imidazole copper.

[0090] The mass ratio of imidazole copper coated with dopamine to alumina is 1:7.

[0091] Step 3: Preparation of modified carbon nanotubes:

[0092] Take 3 g of alumina-coated imidazole copper and 100 mL of deionized water, stir for 1.5 h, add 5 g of glass fiber, and continue stirring at 50 ° C for 1.5 h to prepare modified glass fiber;

[0093] Take 1g of carbon nanotubes, 5mL of nitric acid, and 15mL of hydrogen peroxide, ultrasonically treat for 50min, react at 105℃ for 3.5h, filter, wash, and dry to obtain carboxylated carbon nanotubes;

[0094] 0.5 g of carboxylated carbon nanotubes, 0.1 g of 4-dimethylaminopyridine, 0.7 g of N, N'-dicyclohexylcarboximide, 0.3 g of silane coupling agent KH550, and 500 mL of tetrahydrofuran were ultrasonically dispersed for 2.5 h, filtered, washed, and dried to obtain treated carbon nanotubes;

[0095] 0.1 g of the treated carbon nanotubes and 100 mL of ethanol were stirred for 1.5 h, 12 g of modified glass fiber was added, and the mixture was reacted at 50° C. for 3.5 h. The mixture was filtered, washed, and dried to obtain a carbon nanotube-glass fiber composite.

[0096] Step 4: Take carbon nanotube-glass fiber composite, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0097] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0098] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0099] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0100] The composite board includes the following components: by weight, 110 parts of polyamide resin, 45 parts of carbon nanotube-glass fiber composite, 20 parts of ammonium polyphosphate, and 0.7 parts of tris(2,4-di-tert-butylphenyl)phosphite.

[0101] Example 6: No carbon nanotubes were added, and the rest was the same as Example 1.

[0102] Step 1: Preparation of copper imidazole:

[0103] Take 10g of copper acetate and 100mL of deionized water, stir evenly to obtain a mixed solution; take 31g of sodium bicarbonate, 10g of imidazole, and 300mL of deionized water, stir evenly, continue stirring at 100℃ for 15min, add the mixed solution dropwise, heat to react for 60min, cool to 30℃, stir for 70h, and dry to obtain imidazole copper.

[0104] Step 2: Preparation of imidazole copper coated with alumina:

[0105] Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8.5 to prepare a buffer solution, add dopamine to prepare a dopamine solution with a concentration of 2.5 g / L, take 60 mL of dopamine solution, add 3 g of imidazole copper, stir for 44 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper;

[0106] Take 2.5 g of dopamine-coated imidazole copper and 100 mL of deionized water, stir evenly, add 7 g of aluminum oxide, continue stirring for 3 hours, filter, and vacuum dry for 5.5 hours to obtain aluminum oxide-coated imidazole copper.

[0107] Step 3: Preparation of modified glass fiber:

[0108] Take 3 g of alumina-coated imidazole copper and 100 mL of deionized water, stir for 1.5 h, add 5 g of glass fiber, and continue stirring at 50° C. for 1.5 h to obtain modified glass fiber.

[0109] Step 4: Take modified glass fiber, polyamide resin, ammonium polyphosphate, and tris(2,4-di-tert-butylphenyl)phosphite, mix them evenly, extrude, cool, pelletize, dry, melt-extrude, pull, and cut to obtain an evacuation platform composite board with fireproof function.

[0110] The polyamide resin was purchased from Wuhan Haorong Biotechnology Co., Ltd.

[0111] Ammonium polyphosphate was purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0112] Tris(2,4-di-tert-butylphenyl)phosphite was purchased from Chengdu Huaxia Chemical Reagent Co., Ltd.

[0113] The composite board includes the following components: by weight, 110 parts of polyamide resin, 45 parts of modified glass fiber, 20 parts of ammonium polyphosphate, and 0.7 parts of tris(2,4-di-tert-butylphenyl)phosphite.

[0114] experiment

[0115] The evacuation platform composite panels prepared in Examples 1 to 6 were subjected to performance tests. The flame retardant properties of the composite panels were tested using an oxygen index meter. The bending strength of the composite panels was tested according to GB / T9341-2008. The load-bearing performance was tested according to JC / T1026-2007. The obtained data are shown below:

[0116]

[0117] Conclusion: Comparing the data in the table, we can see that Example 4 does not include copper imidazole, while Example 5, which includes dopamine-coated copper imidazole and aluminum oxide in a mass ratio of 1:7, exhibits reduced flame retardancy due to the relatively low amount of copper imidazole added. In Example 6, the composite board strength decreases due to the absence of carbon nanotubes. The composite board produced according to the method of the present invention exhibits excellent flame retardancy and load-bearing properties, making it suitable for evacuation platforms.

[0118] 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 composite board for an evacuation platform with fire protection function, characterized in that: The following steps are involved: Step 1: Take imidazole copper coated with alumina and deionized water, stir for 1-2 hours, add glass fiber, and continue stirring at 45-55°C for 1-2 hours to prepare modified glass fiber; Step 2: Take the treated carbon nanotubes and ethanol, stir for 1-2 hours, add modified glass fiber, react at 45-55°C for 3-4 hours, filter, wash, and dry to obtain a carbon nanotube-glass fiber composite; Step 3: taking a carbon nanotube-glass fiber composite, a polyamide resin, ammonium polyphosphate, and an antioxidant, mixing them uniformly, extruding, cooling, pelletizing, drying, melting at 220-260° C., extruding, pulling, and cutting to produce an evacuation platform composite board with fireproof function; In step 1, the preparation method of imidazole copper coated with alumina is: The following steps are involved: S1: Take hydrochloric acid and tris(hydroxymethylaminomethane), adjust the pH to 8-9 to prepare a buffer solution, add dopamine to prepare a dopamine solution, take the dopamine solution, add imidazole copper, stir for 40-48 hours, filter, and vacuum dry to obtain dopamine-coated imidazole copper; S2: Take dopamine-coated imidazole copper and deionized water, stir evenly, add aluminum oxide, continue stirring for 2.5-3.5 hours, filter, and vacuum dry for 5-6 hours to obtain aluminum oxide-coated imidazole copper.

2. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 1, characterized in that: The composite board comprises the following components: by weight, 100-120 parts of polyamide resin, 40-50 parts of carbon nanotube-glass fiber composite, 15-25 parts of ammonium polyphosphate, and 0.5-1 part of antioxidant.

3. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 1, characterized in that: The antioxidant is a phosphite antioxidant.

4. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 1, characterized in that: The preparation method of the imidazole copper comprises the following steps: taking copper acetate and deionized water, stirring evenly to obtain a mixed solution; taking sodium bicarbonate, imidazole, and deionized water, stirring evenly, continuing stirring at 95-105° C. for 10-20 minutes, dropwise adding the mixed solution, heating for reaction for 50-70 minutes, cooling to 25-35° C., stirring for 68-74 hours, and drying to obtain the imidazole copper.

5. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 1, characterized in that: In S2, the mass ratio of the dopamine-coated copper imidazole to alumina is 1:(2.5-4).

6. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 1, characterized in that: In step 2, the preparation method of the treated carbon nanotubes is as follows: taking carbon nanotubes, nitric acid, and hydrogen peroxide, ultrasonically treating for 40-60 minutes, reacting at 100-110°C for 3-4 hours, filtering, washing, and drying to obtain carboxylated carbon nanotubes; taking carboxylated carbon nanotubes, 4-dimethylaminopyridine, N,N'-dicyclohexylcarboximide, a silane coupling agent, and 500 mL of tetrahydrofuran, ultrasonically dispersing for 2-3 hours, filtering, washing, and drying to obtain treated carbon nanotubes.

7. The method for preparing a composite board for an evacuation platform with fire protection function according to claim 6, characterized in that: The silane coupling agent is KH550.

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