Dual-flame-retardant building membrane material and preparation method thereof

Abstract

The invention relates to the technical field of membrane materials, in particular to a dual-flame-retardant building membrane material and a preparation method thereof. Comprising the following raw materials in parts by mass: 100 parts of methyl methacrylate, 0.4-0.8 part of azodiisobutyronitrile, 2-4 parts of vinyl silicone oil and 15-25 parts of a flame-retardant heat-resistant agent, wherein the flame-retardant heat-resistant agent is prepared by the following steps: uniformly mixing a heat-resistant unit, triethylamine and cyclopentyl methyl ether under an ice-water bath condition, then adding diethyl phosphoryl chloride into a system, removing the ice-water bath after adding is completed, and reacting under a room temperature condition to obtain the flame-retardant heat-resistant agent; the building membrane material disclosed by the invention is excellent in heat-conducting property and good in flame retardant property, and can be widely applied to the field of building materials.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of film materials, and particularly relates to a dual flame-retardant building film material and a preparation method thereof. BACKGROUND

[0002] Polymethyl methacrylate (PMMA, commonly known as acrylic or organic glass) has become an important substitute or supplement material for glass in the field of building due to its extremely high light transmittance (up to more than 92%), excellent weather resistance and good processing performance, and is widely used in daylighting ceilings, curtain walls, partitions and decorative panels. However, its inherent flammability (limiting oxygen index is only about 17.5%) seriously limits its safe application in public buildings, transportation hubs and other scenarios with strict fire safety requirements. Therefore, developing a PMMA-based building film material with high light transmittance, good mechanical properties and high-efficiency flame retardance has become an urgent and high-value-added technical challenge in this field.

[0003] At present, the common technical path for flame-retardant modification of PMMA mainly includes physical blending and chemical modification. The physical blending method usually directly mixes inorganic flame retardants (such as aluminum hydroxide, expanded graphite) or halogen-based, phosphorus-based and nitrogen-based flame retardants with the PMMA matrix. This method is simple, but generally has problems such as large addition amount, poor compatibility with the matrix, easy migration and precipitation, and serious damage to the light transmittance and mechanical properties (especially toughness and strength) of the material. For example, a large amount of inorganic fillers will cause the film material to be turbid and brittle. The chemical modification method introduces flame-retardant elements (such as phosphorus and nitrogen) into the PMMA molecular chain through copolymerization or grafting, which can achieve flame retardance at a lower addition amount and better compatibility. However, the reactive flame-retardant monomers in the prior art often have single function, most of which only provide one of the gas-phase flame retardation or condensed-phase flame retardation mechanisms, and there is a bottleneck in the flame-retardant efficiency; at the same time, the introduction of rigid flame-retardant structures often sacrifices the flexibility and processing fluidity of the material. SUMMARY

[0004] The purpose of the present application is to provide a dual flame-retardant building film material and a preparation method thereof, which can solve the problems mentioned in the background.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A dual flame-retardant building film material, comprising the following raw materials in mass fraction: 100 parts of methyl methacrylate, 0.4-0.8 parts of azobisdimethylvaleronitrile, 2-4 parts of vinyl silicone oil, and 15-25 parts of flame-retardant heat-resistant agent.

[0007] The flame-retardant heat-resistant agent is prepared by the following steps:

[0008] Mix the heat-resistant unit, triethylamine and cyclopentyl methyl ether uniformly under ice water bath condition, then add diethyl phosphorochloridate to the system, remove the ice water bath after the addition is completed and react under room temperature condition to obtain the flame-retardant heat-resistant agent;

[0009] The heat-resistant unit has the structure shown in the following formula 1. ; R in formula 1 is allyl.

[0010] As a further technical solution of the application, the amount ratio of the heat-resistant unit, triethylamine, cyclopentyl methyl ether and diethyl phosphorochloridate used is 0.06 mol: 0.08-0.1 mol: 40-60 mL: 0.08 mol.

[0011] A preparation method of a double flame-retardant building film material, comprising the following preparation steps:

[0012] Methyl methacrylate, azobisdimethylvaleronitrile, vinyl silicone oil and the flame-retardant heat-resistant agent are polymerized together under nitrogen protection condition, then poured into a mold after heat treatment and solidification, cooled, demolded and pulverized to obtain a master batch.

[0013] The master batch is prepared into a double flame-retardant building film material by a solution casting method.

[0014] As a further technical solution of the application, the temperature condition for polymerization is 60-80 DEG C.

[0015] As a further technical solution of the application, the reaction time condition for polymerization is 20-30 min.

[0016] As a further technical solution of the application, the heat treatment and solidification condition is as follows: heating to 70 DEG C for 12 h, then heating to 90-100 DEG C for 8 h and finally heating to 120-130 DEG C for 4 h.

[0017] As a further technical solution of the application, the solution casting method preparation process is as follows:

[0018] The master batch is dissolved in acetone solvent to prepare a solution with a solid content of 15%-20%, magnetically stirred until completely dissolved, clear and transparent, and the solution is filtered with a 0.45 mu m polytetrafluoroethylene microporous filter membrane.

[0019] The filtered solution is poured on a polytetrafluoroethylene plate, the wet film thickness is controlled by using an automatic coating machine, the substrate with the wet film is first volatilized at room temperature, then transferred to a 40 DEG C oven for drying, finally heated to 60-70 DEG C for further drying, and the completely dried film is peeled off from the substrate.

[0020] As a further technical solution of the application, the room temperature volatilization time is 1-2 hours.

[0021] As a further technical solution of the present application: the time of oven drying at 40 DEG C is 2 hours.

[0022] As a further technical solution of the present application: the time of continuing drying at 60-70 DEG C is 4-6 hours.

[0023] The beneficial effects of the present application are:

[0024] The present application uses methyl methacrylate, azobisisobutyronitrile, vinyl silicone oil and flame-retardant heat-resistant agent as raw materials to prepare a high-thermal-conductivity electronic packaging low-melting-point glass powder, the present application modifies micron-sized aluminum nitride by using silane coupling agent first, then polymerizes methyl methacrylate, azobisisobutyronitrile, vinyl silicone oil and flame-retardant heat-resistant agent together in water phase, finally pours the prepolymer into a mold, and after heat baking and curing, cools, demolds, and grinds to obtain the master batch; the master batch is prepared into double-flame-retardant building film material by solution casting method; the present application also adds vinyl silicone oil when preparing the prepolymer, thereby improving the wear resistance and weather resistance of the prepared glass powder.

[0025] The present application uses 4-maleimide phenol and allyl bromide as raw materials, and a Williamson reaction occurs between the hydroxyl group of 4-maleimide phenol and the bromine atom of allyl bromide in an alkaline environment to obtain a heat-resistant unit precursor, then Claisen rearrangement reaction of the allyl ether structure of the heat-resistant unit precursor occurs at high temperature to obtain a heat-resistant unit, and finally esterification reaction of the hydroxyl group of the heat-resistant unit and diethyl phosphoryl chloride occurs to obtain a flame-retardant heat-resistant agent; the flame-retardant heat-resistant agent has two double bonds, can polymerize with methyl methacrylate, and form covalent bonds between polymer molecular chains to change the linear structure of the polymer into a network structure, limit the movement ability of the molecular chain, and thereby improve the heat resistance, hardness and strength of the prepared glass; in addition, the heat-resistant agent can introduce a benzoheterocyclic structure into the polymer, improve the rigidity of the molecular chain, and further improve the heat resistance of the prepared glass; moreover, the flame-retardant heat-resistant agent has a phosphate structure, can produce a heat-insulating and oxygen-insulating protective carbon layer when encountering high temperature, and insulates the contact between the flame and the base material; the flame-retardant heat-resistant agent can also produce non-combustible gases such as nitrogen and ammonia gas by thermal decomposition of the maleimide ring, dilute the concentration of oxygen and combustible gases, and produce gas-phase synergy with phosphorus, thereby endowing the material with good double-flame-retardant property.

[0026] The building film material of the present application has excellent thermal conductivity and good flame-retardant property, and can be widely applied in the field of building materials. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described below in combination with the drawings.

[0028] Figure 1 It is an infrared spectrum analysis diagram of the flame-retardant heat-resistant agent of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Embodiment 1

[0031] A flame-retardant heat-resistant agent is prepared by the following steps:

[0032] Step 1, 0.1 mol of 4-maleimide phenol, 0.1 mol of allyl bromide, 30 mL of a 30% sodium hydroxide solution, and 40 mL of toluene are mixed in a three-necked flask, a condenser and a thermometer are installed, magnetic stirring is started, and the mixture is reacted at a temperature of 50°C for 3 hours. After the reaction is completed, the organic layer is separated by a separatory funnel, and the heat-resistant unit precursor is obtained by rotary evaporation of the organic layer.

[0033] Step 2, 0.08 mol of the heat-resistant unit precursor, 60 mL of lauryl, and 10 mL of xylene are mixed in a three-necked flask, a condenser and a thermometer are installed, magnetic stirring is started, and the mixture is reacted at a temperature of 180°C for 8 hours. After the reaction is completed, the solvent is removed by rotary evaporation, and the heat-resistant unit is obtained by silica gel column chromatography.

[0034] Step 3, 0.06 mol of the heat-resistant unit, 0.08 mol of triethylamine, and 40 mL of cyclopentyl methyl ether are mixed in a three-necked flask, magnetic stirring is started, 0.08 mol of diethyl phosphorus oxychloride is added dropwise to the three-necked flask under the condition of an ice water bath, the ice water bath is removed after the dropwise addition is completed, and the mixture is reacted at room temperature for 12 hours. After the reaction is completed, deionized water is added to the three-necked flask for washing, the organic layer is separated by a separatory funnel, and the flame-retardant heat-resistant agent is obtained by rotary evaporation of the organic layer and silica gel column chromatography.

[0035] Embodiment 2

[0036] A flame-retardant heat-resistant agent is prepared by the following steps:

[0037] Step 1, 0.1 mol of 4-maleimide phenol, 0.1 mol of allyl bromide, 35 mL of a 30% sodium hydroxide solution, and 50 mL of toluene are mixed in a three-necked flask, a condenser and a thermometer are installed, magnetic stirring is started, and the mixture is reacted at a temperature of 55°C for 3.5 hours. After the reaction is completed, the organic layer is separated by a separatory funnel, and the heat-resistant unit precursor is obtained by rotary evaporation of the organic layer.

[0038] Step 2, 0.08 mol of the heat-resistant unit precursor, 60 mL of lauryl, and 11 mL of xylene were mixed in a three-necked flask, which was equipped with a condenser and a thermometer, and magnetic stirring was started. The reaction was carried out at 190℃ for 9 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the heat-resistant unit was obtained by silica gel column chromatography.

[0039] Step 3, 0.06 mol of the heat-resistant unit, 0.09 mol of triethylamine, and 50 mL of cyclopentyl methyl ether were mixed in a three-necked flask, and 0.08 mol of diethyl phosphorus oxychloride was added dropwise to the flask under ice-water bath. After the dropwise addition was completed, the ice-water bath was removed, and the reaction was carried out at room temperature for 12 h. After the reaction was completed, deionized water was added to the flask for washing, and then the organic layer was separated by a separatory funnel. The organic layer was rotary evaporated, and the flame-retardant heat-resistant agent was obtained by silica gel column chromatography.

[0040] Example 3

[0041] A flame-retardant heat-resistant agent was prepared by the following steps:

[0042] Step 1, 0.1 mol of 4-maleimide phenol, 0.1 mol of allyl bromide, 40 mL of a 30% sodium hydroxide solution, and 60 mL of toluene were mixed in a three-necked flask, which was equipped with a condenser and a thermometer, and magnetic stirring was started. The reaction was carried out at 60℃ for 4 h. After the reaction was completed, the organic layer was separated by a separatory funnel, and the heat-resistant unit precursor was obtained by rotary evaporation.

[0043] Step 2, 0.08 mol of the heat-resistant unit precursor, 60 mL of lauryl, and 12 mL of xylene were mixed in a three-necked flask, which was equipped with a condenser and a thermometer, and magnetic stirring was started. The reaction was carried out at 200℃ for 10 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the heat-resistant unit was obtained by silica gel column chromatography.

[0044] Step 3, 0.06 mol of the heat-resistant unit, 0.1 mol of triethylamine, and 60 mL of cyclopentyl methyl ether were mixed in a three-necked flask, and 0.08 mol of diethyl phosphorus oxychloride was added dropwise to the flask under ice-water bath. After the dropwise addition was completed, the ice-water bath was removed, and the reaction was carried out at room temperature for 12 h. After the reaction was completed, deionized water was added to the flask for washing, and then the organic layer was separated by a separatory funnel. The organic layer was rotary evaporated, and the flame-retardant heat-resistant agent was obtained by silica gel column chromatography.

[0045] Experimental Example 1

[0046] The flame-retardant heat-resistant agent obtained in Example 1 was subjected to infrared spectrum analysis by using a Nicolet 6700 Fourier transform infrared spectrometer produced by Thermo, USA, as shown in FIG. 1. Figure 1 As shown in FIG. 1, the obtained flame-retardant heat-resistant agent had a characteristic absorption peak at 1720 cm-1, which was the characteristic absorption peak of the carbonyl group. Figure 1It can be seen that in the infrared spectrum of the flame-retardant heat-resistant agent, the phosphorus-oxygen double bond absorption peak of phosphonate appears at 1260 cm -1 , the carbon-carbon double bond absorption peak appears at 1674 cm -1 , the carbon-oxygen double bond absorption peak appears at 1712 cm -1 , the carbon-hydrogen bond absorption peak in the benzene ring appears at 3062 cm -1 .

[0047] Example 4

[0048] A double flame-retardant building film material, comprising the following mass fractions of raw materials: methyl methacrylate 100 parts, azobisdimethylvaleronitrile 0.4 parts, vinyl silicone oil 2 parts, the flame-retardant heat-resistant agent obtained in Example 1 15 parts;

[0049] A method for preparing a double flame-retardant building film material, comprising the following steps:

[0050] Firstly, methyl methacrylate, azobisdimethylvaleronitrile, vinyl silicone oil and the flame-retardant heat-resistant agent obtained in Example 1 are mixed in a container, and then nitrogen is introduced for protection, followed by circulating water, and the pre-polymer is obtained by reacting at a temperature of 60℃ for 20 min;

[0051] Secondly, the pre-polymer is poured into a mold, and then the mold is placed in an oven and heated to 70℃ for curing for 12 h, then heated to 90℃ for curing for 8 h, and finally heated to 120℃ for curing for 4 h, and then cooled and demolded to obtain the master batch;

[0052] Thirdly, the master batch is dissolved in acetone solvent to prepare a solution with a solid content of 15%, and then magnetically stirred until completely dissolved, clear and transparent; the solution is filtered with a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 μm;

[0053] The filtered solution is poured on a polytetrafluoroethylene plate, and an automatic coating machine is used to control the wet film thickness; the substrate with the wet film is first volatilized at room temperature for 1 hour, and then transferred to a 40℃ oven for drying for 2 hours, and finally heated to 60℃ for further drying for 4 hours,

[0054] The completely dried film is peeled off from the substrate to obtain the double flame-retardant building film material.

[0055] Example 5

[0056] A double flame-retardant building film material, comprising the following mass fractions of raw materials: methyl methacrylate 100 parts, azobisdimethylvaleronitrile 0.6 parts, vinyl silicone oil 3 parts, the flame-retardant heat-resistant agent obtained in Example 2 20 parts;

[0057] A method for preparing a double flame-retardant building film material, comprising the following steps:

[0058] The first step, methyl methacrylate, azobis isobutyronitrile, vinyl silicone oil, flame-retardant heat-resistant agent obtained in Example 2 are mixed in a container, and nitrogen is introduced for protection, then circulating water is introduced and reacted at a temperature of 70 DEG C for 25 min to obtain a prepolymer;

[0059] The second step, the prepolymer is poured into a mold, placed in an oven and heated to 70 DEG C for curing for 12 h, then heated to 95 DEG C for curing for 8 h, and finally heated to 125 DEG C for curing for 4 h, and then cooled, demolded and crushed to obtain a master batch;

[0060] The third step, the master batch is dissolved in acetone solvent to prepare a solution with a solid content of 18%, and magnetic stirring is performed until complete dissolution, clarification and transparency; the solution is filtered with a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 mu m;

[0061] The filtered solution is poured on a polytetrafluoroethylene plate, and an automatic coating machine is used to control the wet film thickness, the substrate with the wet film is first volatilized at room temperature for 1.5 hours, then transferred to a 40 DEG C oven for drying for 2 hours, and finally heated to 65 DEG C for further drying for 5 hours,

[0062] The completely dried film is peeled off from the substrate to obtain a double flame-retardant building film.

[0063] Example 6

[0064] A double flame-retardant building film, comprising the following raw materials in mass fraction: methyl methacrylate 100 parts, azobis isobutyronitrile 0.8 parts, vinyl silicone oil 4 parts, and flame-retardant heat-resistant agent obtained in Example 3 25 parts;

[0065] A method for preparing a double flame-retardant building film, comprising the following steps:

[0066] The first step, methyl methacrylate, azobis isobutyronitrile, vinyl silicone oil, and flame-retardant heat-resistant agent obtained in Example 3 are mixed in a container, and nitrogen is introduced for protection, then circulating water is introduced and reacted at a temperature of 80 DEG C for 30 min to obtain a prepolymer;

[0067] The second step, the prepolymer is poured into a mold, placed in an oven and heated to 70 DEG C for curing for 12 h, then heated to 100 DEG C for curing for 8 h, and finally heated to 130 DEG C for curing for 4 h, and then cooled, demolded and crushed to obtain a master batch;

[0068] The third step, the master batch is dissolved in acetone solvent to prepare a solution with a solid content of 20%, and magnetic stirring is performed until complete dissolution, clarification and transparency; the solution is filtered with a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 mu m;

[0069] The filtered solution was poured onto a polytetrafluoroethylene plate, the wet film thickness was controlled using an automatic coating machine, the substrate with the wet film was first volatilized at room temperature for 2 hours, then transferred to a 40°C oven for drying for 2 hours, and finally heated to 70°C for continuous drying for 6 hours,

[0070] The completely dried film was peeled off from the substrate to obtain the double flame-retardant building film.

[0071] Comparative Example 1

[0072] A double flame-retardant building film, comprising the following raw materials in mass parts: methyl methacrylate 100 parts, azobisdimethylvaleronitrile 0.8 parts, and vinyl silicone oil 4 parts.

[0073] A preparation method of a double flame-retardant building film, comprising the following steps:

[0074] First step, methyl methacrylate, azobisdimethylvaleronitrile and vinyl silicone oil were mixed in a container, and nitrogen was introduced for protection, then circulating water was introduced and reacted at a temperature of 80°C for 30 minutes to obtain a prepolymer;

[0075] Fourth step, the prepolymer was poured into a mold, placed in an oven and heated to 70°C for curing for 12 hours, then heated to 100°C for curing for 8 hours, and finally heated to 130°C for curing for 4 hours, and then cooled, demolded and crushed into master batches;

[0076] Third step, the master batch was dissolved in acetone solvent to prepare a solution with a solid content of 15%, and magnetic stirring was performed until complete dissolution, clarification and transparency; the solution was filtered with a polytetrafluoroethylene microporous filter membrane with a pore size of 0.45 μm;

[0077] The filtered solution was poured onto a polytetrafluoroethylene plate, the wet film thickness was controlled using an automatic coating machine, the substrate with the wet film was first volatilized at room temperature for 1 hour, then transferred to a 40°C oven for drying for 2 hours, and finally heated to 60°C for continuous drying for 4 hours,

[0078] The completely dried film was peeled off from the substrate to obtain the double flame-retardant building film.

[0079] Performance test

[0080] The building films obtained in Examples 4-6 and Comparative Example 1 were tested as follows:

[0081] Thermal conductivity test: according to the national standard GB / T 38712-2020 "Test method for thermal conductivity of ultra-thin glass-heat flow method", the thermal conductivity of the building film was tested,

[0082] Flame retardant performance test: according to the national standard GB / T 2406.2-2009 "Determination of flammability of plastics by oxygen index method", the limiting oxygen index of the building film was tested.

[0083] The test results are shown in Table 1:

[0084] Thermal conductivity {W / (m.k)} Limiting oxygen index (%) Example 4 3.13 27.16 Example 5 3.26 28.49 Example 6 3.41 29.12 Comparative Example 1 0.14 18.12

[0085] As shown in Table 1, the building film material of the present application has excellent heat conduction performance and good flame retardant performance, and can be widely applied in the field of building materials.

[0086] The preparation method of the double flame-retardant building film material is described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above examples are only used to help understand the method of the present application and its core idea, including the best mode, and also enable any person skilled in the art to practice the present application, including manufacturing and using any device or system, and implementing any combined method. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application. In particular, as long as there is no structural conflict, each feature in the disclosed embodiments of the present application can be combined with each other in any way. The description in this specification is not exhaustive, but is only for the purpose of omitting the length and saving resources. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dual flame-retardant architectural membrane material, characterized in that, The raw materials include the following parts by weight: 100 parts methyl methacrylate, 0.4-0.8 parts azobisisobutyronitrile, 2-4 parts vinyl silicone oil, and 15-25 parts flame retardant and heat resistant agent; The flame retardant and heat-resistant agent is prepared by the following steps: The heat-resistant unit, triethylamine, and cyclopentyl methyl ether were mixed evenly under ice-water bath conditions. Then, diethylphosphoryl chloride was added to the system. After the addition was completed, the ice-water bath was removed and the reaction was carried out at room temperature to obtain the flame-retardant heat-resistant agent. The heat-resistant unit has the structure described in Formula 1: In Formula 1, R stands for allyl.

2. The dual flame-retardant architectural membrane material according to claim 1, characterized in that, The ratio of heat-resistant unit, triethylamine, cyclopentyl methyl ether, and diethylphosphoryl chloride used is 0.06 mol: 0.08-0.1 mol: 40-60 mL: 0.08 mol.

3. A method for preparing a dual flame-retardant architectural membrane material as described in any one of claims 1-2, characterized in that, The preparation steps include the following: Methyl methacrylate, azobisisobutyronitrile, vinyl silicone oil, and flame retardant and heat resistant agent are polymerized together under nitrogen protection. After polymerization, the mixture is poured into a mold, heat-treated to solidify, cooled, demolded, and crushed to obtain masterbatch. The masterbatch was prepared into a dual flame-retardant building membrane material by solution casting.

4. The method for preparing a dual flame-retardant architectural membrane material according to claim 3, characterized in that, The polymerization temperature is 60-80℃.

5. The method for preparing a dual flame-retardant architectural membrane material according to claim 3, characterized in that, The polymerization reaction time is 20-30 min.

6. The method for preparing a dual flame-retardant architectural membrane material according to claim 3, characterized in that, The heat treatment curing conditions are as follows: heat to 70℃ and cure for 12 hours, then heat to 90-100℃ and cure for 8 hours, and finally heat to 120-130℃ and cure for 4 hours.

7. The method for preparing a dual flame-retardant architectural membrane material according to claim 3, characterized in that, The process of preparation by solution casting is as follows: Dissolve the masterbatch in acetone to prepare a solution with a solid content of 15%-20%, and stir magnetically until completely dissolved and clear; filter the solution through a 0.45μm polytetrafluoroethylene microporous membrane. The filtered solution is poured onto a polytetrafluoroethylene (PTFE) plate. An automatic coating machine is used to control the thickness of the wet film. The substrate with the wet film is first allowed to evaporate at room temperature, then transferred to a 40°C oven for drying. Finally, the temperature is raised to 60-70°C for further drying. The completely dried film is then peeled off from the substrate.

8. The method for preparing a dual flame-retardant architectural membrane material according to claim 7, characterized in that, The evaporation time at room temperature is 1-2 hours.

9. The method for preparing a dual flame-retardant architectural membrane material according to claim 7, characterized in that, The drying time in the 40℃ oven is 2 hours.

10. The method for preparing a dual flame-retardant architectural membrane material according to claim 7, characterized in that, Continue drying at 60-70℃ for 4-6 hours.

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