Flame-retardant metal microcellular sealant and preparation method thereof
By chemically bonding the environmentally friendly phosphorus-based flame retardant DOPO-HQ to acrylate sealants, the problems of flammability of acrylate sealants and toxicity of halogen-based flame retardants are solved. This achieves highly efficient flame retardant, heat-resistant, and aging-resistant sealing performance, reduces sealant costs, and improves contact with castings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING FORESTRY UNIVERSITY
- Filing Date
- 2026-06-03
- Publication Date
- 2026-07-28
AI Technical Summary
Existing acrylic vacuum sealants are flammable and pose safety hazards. Halogenated flame retardants produce toxic substances when burning, and high addition amounts affect the sealant's performance. Existing environmentally friendly flame retardants have poor compatibility with acrylic sealants.
A flame-retardant metal microporous sealant was prepared by chemically bonding the environmentally friendly phosphorus-based flame retardant DOPO-HQ with acrylate. The flame-retardant reactive monomer DDOPQ-POMA was generated by reacting POCl3 with DOPO-HQ and hydroxy/amino acrylate, and then used in acrylate sealants.
It achieves high heat resistance and aging resistance of sealant with high flame retardancy and low addition amount, excellent sealing performance, reduces sealant cost and improves contact with castings, and avoids flame retardant migration.
Smart Images
Figure CN122465075A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of impregnating agent materials, specifically to a flame-retardant metal microporous sealant and its preparation method. Background Technology
[0002] Aluminum alloys produce a large number of tiny particles during the die-casting process. Defects such as shrinkage cavities, cracks, or porosity (≤0.5mm) may not compromise the structural strength of die-cast parts, but they can lead to loss of sealing and render the part unusable. Therefore, a rapid and efficient method is needed to seal and reinforce these micropores.
[0003] Acrylic ester vacuum sealants are liquid substances mainly composed of acrylate monomers of different functionalities formulated in a certain proportion, supplemented with initiators, polymerization inhibitors, and surfactants. Due to the good chemical stability, mechanical properties, and weather resistance of acrylates and thermosetting materials, they have become the most widely used micropore sealants for metal die castings.
[0004] Acrylic compounds have relatively low ignition and flash points, making them flammable. Therefore, vacuum sealants formulated from acrylate monomers have very low limiting oxygen index (LOI), posing safety hazards during production, use, and storage, and significantly limiting their application.
[0005] Halogenated flame retardants possess advantages such as high flame retardant efficiency and minimal impact on substrate properties, enabling them to enhance the flame retardancy of polymer materials. CN104387522A discloses a flame-retardant acrylate-based organic impregnating agent for sealing and reinforcement, and its preparation method. This invention involves bonding bromine to the methacrylate monomer molecular chain, significantly improving the flame retardant properties of the cured impregnating agent, achieving an oxygen index exceeding 27%. However, halogenated flame retardants readily produce dense smoke, dioxins, and hydrogen halides during combustion, posing a significant threat to the environment and human health. Therefore, their application in electronic products and new energy vehicles is currently restricted. Furthermore, practical flame retardants typically require high dosages, but high dosages in acrylate sealants can lead to excessively high viscosity of the sealant and a decline in the performance of thermosetting materials.
[0006] DOPO-HQ is a class of phospholipid compounds containing a phosphorus-phenanthroline ring and a phenol structure. Its chemical name is 10-(2,5-dihydroxyphenyl)-10-hydro-9-oxa-10-phosphaphenanthrene-10-oxide. It is a commercially available green and environmentally friendly phosphorus-based flame retardant with high thermal stability, low smoke and non-toxicity, low addition amount and minimal impact on the properties of polymer materials. It is now used as a substitute for halogen-based flame retardants in various composite materials. Summary of the Invention
[0007] The purpose of this invention is to provide a flame-retardant metal microporous sealant and its preparation method.
[0008] This invention designs and synthesizes an environmentally friendly phosphorus-based flame retardant, which is then used as a reactive monomer to chemically bond and cure with acrylates to produce a highly efficient flame-retardant acrylate sealant. This sealant possesses high heat resistance, high aging resistance, and high flame retardancy. Simultaneously, this type of flame-retardant sealant exhibits excellent curing performance and provides excellent sealing properties for castings. This environmentally friendly phosphorus-based flame retardant is prepared by chemical grafting phosphorus oxychloride (POCl3) with DOPO-HQ and hydroxy / amino acrylates.
[0009] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a flame-retardant metal microporous sealant, wherein the flame-retardant metal microporous sealant comprises the following components in parts by weight: 45-60 parts of monofunctional acrylate monomer, 25-44 parts of difunctional acrylate monomer, 10-15 parts of flame-retardant reactive monomer, 0.1-0.3 parts of polymerization inhibitor, 0.4-0.8 parts of initiator, and 0.05-0.3 parts of surfactant; The flame-retardant reactive monomer is obtained by reacting POCl3 sequentially with DOPO-HQ and hydroxy / amino acrylates, and is designated as DDOPQ-POMA.
[0010] The term "hydroxyl / amino acrylate" refers to hydroxyl acrylate or amino acrylate; preferably one of hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), 2-hydroxypropyl isobutylene acrylate, 4-hydroxybutyl methacrylate (4-HBMA), and 2-aminoethyl methacrylate hydrochloride.
[0011] Preferably, the reaction is carried out in a one-pot process.
[0012] In a preferred embodiment, the flame-retardant reactive monomer is obtained through the following steps: Phosphorus oxychloride was dissolved in tetrahydrofuran under stirring, and the mixture was kept in an ice bath at 0°C. Then, DOPO-HQ dissolved in tetrahydrofuran and triethylamine were slowly added dropwise to the above solution. After the addition was complete, the reaction solution was heated to room temperature, and the reaction was continued with stirring for a first predetermined time. A mixture of hydroxy / amino acrylate dissolved in tetrahydrofuran and triethylamine was slowly added to the reaction system, and the reaction was continued at room temperature for a second predetermined time. The triethylamine hydrochloride precipitate and tetrahydrofuran were removed, and the residue was dissolved in dichloromethane. The residue was then washed with dilute hydrochloric acid, saturated sodium bicarbonate aqueous solution, and deionized water, and dried to obtain a reactive flame retardant.
[0013] Preferably, the molar ratio of POCl3, DOPO-HQ, and hydroxy / amino acrylate is 1:2:1.
[0014] In this one-pot preparation process, triethylamine is used as an acid-binding agent in the two-step reaction. The amount of triethylamine used is the same as that of a general acid-binding agent. For example, in the first step reaction, it is in the same molar amount as DOPO-HQ or slightly in excess, and in the second step reaction, it is in the same molar amount as hydroxy / amino acrylates or slightly in excess.
[0015] In the flame-retardant metal microporous sealant of the present invention, the acrylate monomers include monofunctional and difunctional monomers; wherein, the monofunctional acrylate monomers are selected from alkyl esters having 5-25 carbon atoms; preferably, they are selected from at least one of octyl methacrylate, decyl methacrylate, isodecyl methacrylate, isobornyl methacrylate, lauryl methacrylate, diethylene glycol ethyl ether methacrylate, tridecanol methacrylate, tetradecanol methacrylate, and octadecyl methacrylate. More preferably, the monofunctional acrylate monomers are selected from at least one of hydroxyethyl methacrylate, lauryl methacrylate, and isodecyl methacrylate.
[0016] The difunctional acrylate is selected from dialkyl esters having 10-25 carbon atoms; preferably, it is selected from at least one of dimethacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,10-decanediol dimethacrylate, tripropylene glycol diacrylate, and triethylene glycol dimethacrylate. More preferably, the difunctional acrylate is selected from at least one of 1,6-hexanediol dimethacrylate, 1,10-decanediol dimethacrylate, and triethylene glycol dimethacrylate.
[0017] According to the flame-retardant metal microporous sealant of the present invention, preferably, the initiator is selected from peroxide or azo compound initiators.
[0018] More preferably, the initiator is selected from at least one of lauroyl peroxide, diisopropylbenzene peroxide, tert-butyl peroxide, azobisisobutyronitrile, azobisisoheptanenitrile, and dimethyl azobisisobutyrate. More preferably, the initiator is azobisisoheptanenitrile and / or dimethyl azobisisobutyrate.
[0019] According to the flame-retardant metal microporous sealant of the present invention, preferably, the polymerization inhibitor is selected from at least one of hydroquinone, benzoquinone, anthraquinone, 1,4-naphthoquinone, tert-butylcatechol, and 2,6-dibutyl-p-cresol. More preferably, the polymerization inhibitor is 2,6-dibutyl-p-cresol.
[0020] According to the flame-retardant metal microporous sealant of the present invention, preferably, the surfactant is selected from at least one of polyoxyethylene sorbitan monooleate, polyoxyethylene hexadecyl ether, isotridecyl polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester, polyethylene glycol laurate, and polyoxyethylene castor oil.
[0021] Another aspect of the present invention provides a method for preparing any one of the above-mentioned flame-retardant metal microporous sealants, wherein the preparation method includes the following steps: The flame-retardant metal microporous sealant is obtained by uniformly mixing monofunctional acrylate monomers, difunctional acrylate monomers, flame-retardant reactive monomers, polymerization inhibitors, initiators, and surfactants at room temperature.
[0022] The beneficial effects of this invention include: 1) In the acrylate sealant of the present invention, an environmentally friendly phosphorus-based flame retardant is used as the reactive monomer. It is prepared by chemical grafting of phosphorus oxychloride (POCl3) with DOPO-HQ and hydroxy / amino acrylate. It is a symmetrical flame retardant with a double DOPO-HQ structure. During combustion, it can form a more robust, dense and stable phosphorus-rich sealed char layer, achieving a highly efficient flame retardant effect. Therefore, an addition of 10%-15% is sufficient to make the acrylate polymer reach the flame retardant level. Compared with existing flame retardants, the addition amount usually needs to be more than 30% to achieve high flame retardancy.
[0023] 2) The present invention adopts a dual DOPO-HQ structure, which significantly improves the polymer rigidity and hardness of the sealant, as well as its high temperature resistance and aging resistance. It solves the inherent defect that sealants must use multifunctional monomers to improve the performance of cured products, reduces the cost of sealants, and also imparts flame retardancy.
[0024] 3) The phenolic hydroxyl structure in the flame-retardant reactive monomer of this invention has surface-active function, which can provide wetting and activity to the contact surface of the casting, making it easy to clean and remove from the surface of the casting, promoting its rapid and efficient separation from water, and reducing the difficulty of cleaning the sealant.
[0025] 4) The flame-retardant reactive monomer of this invention is an acrylate monomer, which chemically bonds with other acrylate monomers to the polymer chain segments during the thermosetting process, improving the thermal stability and dimensional stability of the polymer linear structure. The phosphaphenanthrene ring is linked by the flexible carbon chain of acrylate, which makes the compatibility between the flame retardant and the acrylate monomer better and avoids the migration of the flame retardant, thus ensuring that the flame retardant performance of the sealant polymer is more durable. Attached Figure Description
[0026] Figure 1 This is a route diagram for the preparation of DDOPQ-POMA 1.
[0027] Figure 2The infrared spectrum of DDOPQ-POMA 1. Detailed Implementation
[0028] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.
[0029] All numerical specifications in this invention (e.g., temperature, time, concentration, and weight, including ranges for each) are generally approximate values that may be changed (+) or (-) in increments of 0.1 or 1.0. All numerical specifications are to be understood as being preceded by the term "about".
[0030] Example 1
[0031] This embodiment provides a flame-retardant metal microporous sealant, prepared by mixing the following weight proportions: 30 parts hydroxyethyl methacrylate, 15 parts lauryl methacrylate, 40 parts 1,10-decanediol dimethacrylate, 14 parts DDOPQ-POMA 1, 0.6 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0032] The flame-retardant reactive monomer DDOPQ-POMA 1 is prepared by the following steps: 30.7 g of phosphorus oxychloride (0.2 mol) was dissolved in 150 mL of tetrahydrofuran with stirring. The mixture was then placed in an ice bath at 0 °C. DOPO-HQ (129.7 g, 0.4 mol) and triethylamine (40.4 g, 0.4 mol) dissolved in 200 mL of tetrahydrofuran were slowly added dropwise to the above solution. After the addition was complete, the reaction mixture was heated to room temperature and stirred for 12 hours. A mixture of HEMA (26.0 g, 0.2 mol) and triethylamine (20.2 g, 0.2 mol) dissolved in 100 mL of tetrahydrofuran was slowly added to the above mixture, and the reaction was continued at room temperature for 8 hours. The triethylamine hydrochloride precipitate and tetrahydrofuran were removed. The residue was dissolved in dichloromethane, washed with dilute hydrochloric acid, saturated sodium bicarbonate aqueous solution, and deionized water, dried, and the dichloromethane was removed to obtain the flame-retardant reactive monomer: DDOPQ-POMA 1.
[0033] The preparation route of DDOPQ-POMA 1 is as follows: Figure 1 As shown, the infrared spectrum is as follows Figure 2 As shown, 3503-2485cm -1 OH group absorption peak; 1721 cm⁻¹ -1 C=O group absorption peaks; 1281 and 1287 cm⁻¹ -1The absorption peaks of the P=O group under two different chemical environments are shown. During the first step of the reaction, both phenolic hydroxyl groups in DOPO-HQ may react, resulting in the presence of isomers in the final product, such as the three isomers listed in the figure. In this invention, these isomers do not need to be distinguished or separated, and they have virtually no impact on the flame-retardant properties of the final sealant.
[0034] Example 2
[0035] This embodiment provides a flame-retardant metal microporous sealant, prepared by mixing the following weight proportions: 25 parts hydroxyethyl methacrylate, 35 parts lauryl methacrylate, 25 parts 1,10-decanediol dimethacrylate, 14 parts DDOPQ-POMA 1, 0.7 parts dimethyl azobisisobutyrate, 0.2 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0036] The preparation method of the flame retardant DDOPQ-POMA 1 is the same as in Example 1.
[0037] Example 3
[0038] This embodiment provides a flame-retardant metal microporous sealant, prepared by mixing the following weight proportions: 25 parts hydroxyethyl methacrylate, 20 parts isodecyl methacrylate, 44 parts 1,6-hexanediol dimethyl diacrylate, 10 parts DDOPQ-POMA 2, 0.7 parts dimethyl azobisisobutyrate, 0.2 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0039] The flame retardant DDOPQ-POMA 2 is prepared in the same way as DDOPQ-POMA 1 in Example 1, except that HEMA (26.0 g, 0.2 mol) is replaced with 2-aminoethyl methacrylate hydrochloride (33.1 g, 0.2 mol).
[0040] Example 4
[0041] This embodiment provides a flame-retardant metal microporous sealant, prepared by mixing the following weight proportions: 30 parts hydroxyethyl methacrylate, 19 parts lauryl methacrylate, 35 parts triethylene glycol dimethacrylate, 15 parts DDOPQ-POMA 2, 0.7 parts dimethyl azobisisobutyrate, 0.2 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0042] The preparation method of the flame retardant DDOPQ-POMA 2 is the same as in Example 3.
[0043] Comparative Example 1
[0044] This comparative example uses the formulation of Example 1, replacing DDOPQ-POMA 1 in the example with a multifunctional acrylate monomer. It is actually prepared by mixing the following components in parts by weight: 30 parts hydroxyethyl methacrylate, 15 parts lauryl methacrylate, 40 parts 1,10-decanediol dimethacrylate, 14 parts pentaerythritol triacrylate, 0.6 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0045] Comparative Example 2
[0046] This comparative example uses the formulation of Example 1, replacing DDOPQ-POMA 1 with DOPO-HQ. It is actually prepared by mixing the following components in parts by weight: 30 parts hydroxyethyl methacrylate, 15 parts lauryl methacrylate, 40 parts 1,10-decanediol dimethacrylate, 14 parts DOPO-HQ, 0.6 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0047] Comparative Example 3
[0048] This comparative example uses the formulation of Example 1, but the amount of DDOPQ-POMA 1 added in the example is changed to 5 parts. It is actually prepared by mixing the following components in parts by weight: 33 parts hydroxyethyl methacrylate, 18 parts lauryl methacrylate, 43 parts 1,10-decanediol dimethacrylate, 5 parts DDOPQ-POMA 1, 0.6 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0049] Comparative Example 4
[0050] This comparative example uses the formulation of Example 1, but the amount of DDOPQ-POMA 1 added in the example is changed to 20 parts. It is actually prepared by mixing the following components in parts by weight: 30 parts hydroxyethyl methacrylate, 15 parts lauryl methacrylate, 34 parts 1,10-decanediol dimethacrylate, 20 parts DDOPQ-POMA 1, 0.6 parts dimethyl azobisisobutyrate, 0.3 parts 2,6-dibutyl-p-cresol, and 0.1 parts polyoxyethylene sorbitan monooleate.
[0051] The sealants prepared from Examples 1-4 and Comparative Examples 1-4 were subjected to the following performance tests, and the results are shown in Table 1.
[0052] 1) Viscosity: Tested according to GB / T2794-2013 Adhesives Viscosity Determination Single Cylindrical Rotation Viscometer Method.
[0053] 2) Curing hardness: Tested according to GB / T531.1-2008 Shore hardness tester method.
[0054] 3) Limiting Oxygen Index (LOI): Determined according to GB / T 10707-2008 (Oxygen Index Tester Combustion Test Method).
[0055] 4) High-temperature sealing performance at 204℃: The sealant to be tested is impregnated with the special impregnation test ring specified by the US military standard MIL-I-17563C. After vacuum impregnation with the sealant, it is placed in water at 90~95℃ for 20~30 minutes for curing. Then it is taken out and placed in a constant temperature aging chamber at 204℃ for 42 days. After the aging period, it is taken out, cooled to room temperature, and then the sealing performance is tested using the sealing performance test device specified by MIL-I-17563C. If there is no leakage, it indicates that the test sample has good high-temperature performance at 204℃; otherwise, it has poor high-temperature performance at 204℃.
[0056] 5) Aging resistance: The test ring is impregnated with the organic impregnating agent specified in the US military standard MIL-I-17563C. After vacuum impregnation with sealant, it is placed in water at 90~95℃ for 20~30 minutes for curing. Then it is removed and placed in the following aging environments: ethylene glycol, 149℃, 14 days; hydraulic oil, 99℃, 14 days; alcohol, 23℃, 2 days; 18% sulfuric acid solution, 23℃, 2 hours. After the expiration period, it is removed and the sealing performance is tested using the sealing test device specified in MIL-I-17563C. If there is no leakage, it indicates that the aging resistance of the test sample is good; otherwise, the aging resistance is poor.
[0057] Table 1 Performance Comparison of Examples and Comparative Examples
[0058] As can be seen from Table 1, in Examples 1-4, adding 10%-15% of flame-retardant reactive monomer can give the sealant a better flame-retardant effect, while maintaining the sealant's curing hardness, high-temperature sealing performance and aging resistance. Therefore, the flame-retardant reactive monomer of the present invention is an ideal flame-retardant material.
[0059] In Comparative Example 1, the formulation of Example 1 was used, with pentaerythritol triacrylate used instead of the flame-retardant reactive monomer of the present invention. However, since it is a polyfunctional ester monomer, the sealant does not have flame-retardant properties.
[0060] In Comparative Example 2, the formulation of Example 1 was used, with flame retardant DOPO-HQ replacing the flame-retardant reactive monomer DDOPQ-POMA 1 of the present invention. Although DOPO-HQ is a commercial flame retardant, it cannot participate in the polymerization reaction, and heating will cause the flame retardant to migrate, so the flame retardant effect is not particularly ideal.
[0061] In Comparative Example 3, when the amount of flame retardant DDOPQ-POMA 1 added was 5 parts, the viscosity and curing hardness of the sealant decreased, while the flame retardant performance also decreased significantly.
[0062] In Comparative Example 4, when the amount of flame retardant DDOPQ-POMA 1 added was 20 parts, the viscosity and curing hardness of the sealant were improved, and the flame retardant performance was better. However, the increased viscosity of the sealant made the impregnation process more difficult, and the impregnation qualification rate was reduced. A second impregnation was required to achieve a 95% qualification rate. At the same time, increasing the amount of flame retardant further increased the cost of the sealant.
[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.
Claims
1. A flame-retardant metal microporous sealant, characterized in that, The flame-retardant metal microporous sealant comprises the following components in parts by weight: 45-60 parts of monofunctional acrylate monomer, 25-44 parts of difunctional acrylate monomer, 10-15 parts of flame-retardant reactive monomer, 0.1-0.3 parts of polymerization inhibitor, 0.4-0.8 parts of initiator, and 0.05-0.3 parts of surfactant; The flame-retardant reactive monomer is obtained by reacting POCl3 sequentially with DOPO-HQ and hydroxy / amino acrylates.
2. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The hydroxy / amino acrylate is selected from one of hydroxyethyl methacrylate, hydroxypropyl methacrylate, 2-hydroxypropyl isobutylene acrylate, 4-hydroxybutyl methacrylate, and 2-aminoethyl methacrylate hydrochloride.
3. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The flame-retardant reactive monomer is obtained through the following steps: Phosphorus oxychloride was dissolved in tetrahydrofuran under stirring, and the mixture was kept in an ice bath at 0°C. Then, DOPO-HQ dissolved in tetrahydrofuran and triethylamine were slowly added dropwise to the above solution. After the addition was complete, the reaction solution was heated to room temperature, and the reaction was continued with stirring for a first predetermined time. A mixture of hydroxy / amino acrylate dissolved in tetrahydrofuran and triethylamine was slowly added to the reaction system, and the reaction was continued at room temperature for a second predetermined time. The triethylamine hydrochloride precipitate and tetrahydrofuran were removed, and the residue was dissolved in dichloromethane. The residue was then washed with dilute hydrochloric acid, saturated sodium bicarbonate aqueous solution, and deionized water, and dried to obtain a reactive flame retardant.
4. The flame-retardant metal microporous sealant according to claim 3, characterized in that, The molar ratio of POCl3, DOPO-HQ, and hydroxy / amino acrylates is 1:2:
1.
5. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The monofunctional acrylate monomer is selected from at least one of octyl methacrylate, decyl methacrylate, isodecyl methacrylate, isobornyl methacrylate, lauryl methacrylate, diethylene glycol ethyl ether methacrylate, tridecanol methacrylate, tetradecanol methacrylate, and octadecyl methacrylate.
6. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The bifunctional acrylate is selected from at least one of dimethyl acrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,10-decanediol dimethacrylate, tripropylene glycol diacrylate, and triethylene glycol dimethacrylate.
7. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The initiator is selected from at least one of lauroyl peroxide, diisopropylbenzene peroxide, tert-butyl peroxide, azobisisobutyronitrile, azobisisoheptanenitrile, and dimethyl azobisisobutyronitrile.
8. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The polymerization inhibitor is selected from at least one of hydroquinone, benzoquinone, anthraquinone, 1,4-naphthoquinone, tert-butylcatechol, and 2,6-dibutyl-p-cresol.
9. The flame-retardant metal microporous sealant according to claim 1, characterized in that, The surfactant is selected from at least one of polyoxyethylene sorbitan monooleate, polyoxyethylene hexadecyl ether, isotridecyl polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ester, polyethylene glycol laurate, and polyoxyethylene castor oil.
10. A method for preparing a flame-retardant metal microporous sealant according to any one of claims 1-9, characterized in that, The preparation method includes the following steps: The flame-retardant metal microporous sealant is obtained by uniformly mixing monofunctional acrylate monomers, difunctional acrylate monomers, flame-retardant reactive monomers, polymerization inhibitors, initiators, and surfactants at room temperature.