Flame-retardant EVA waterproof board and preparation method thereof
By integrating silicon, nitrogen, and phosphorus elements with metal hydroxides and 4-aminobenzothiol and piperazine structures, the flame retardancy and mechanical properties of EVA waterproof boards are enhanced, addressing the limitations of inorganic flame retardants and achieving superior performance.
Patent Information
- Application Number
- CN202510623524.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2025-07-15
AI Technical Summary
At this stage, the inorganic flame retardants commonly used in EVA waterproofing boards, such as aluminum hydroxide and magnesium hydroxide, have insufficient flame retardant performance and cannot meet the usage requirements. Other flame retardants need to be added to improve their flame retardant efficiency.
The flame retardant of the flame retardant elements of silicon, nitrogen and phosphorus are introduced into the EVA waterproofing plate, and the benzene ring and a high carbon content piperazine ring structure are introduced through 4-aminothiophenylthiophenol and piperazine ring structure to form a flame retardant system that works synergistically with metal hydroxides to improve flame retardant performance.
The flame retardant performance of the EVA waterproof plate is significantly improved, and the mechanical properties of the waterproof plate are improved by improving the compatibility of the flame retardant with the EVA matrix.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of building engineering waterproofing, and specifically relates to a flame-retardant EVA waterproof board and a preparation method thereof. Background Art
[0002] Ethylene-vinyl acetate copolymer (EVA) is copolymerized from ethylene and vinyl acetate. Due to its good flexibility, low-temperature toughness, stress cracking resistance, weather resistance, etc., and the fact that EVA is easy to process and form, its application fields are very wide. The EVA waterproof board is a board made mainly of ethylene-vinyl acetate copolymer (EVA) resin and polyethylene (PE) resin. Due to its good physical and chemical properties, it is widely used in the anti-seepage of civil engineering such as railway tunnels, highways, and civil buildings. However, both PE and EVA materials are flammable materials, which limit the development and application of EVA waterproof boards.
[0003] At the present stage, the commonly used flame retardants in EVA are inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide. However, the flame retardant performance of the EVA waterproof board with only inorganic flame retardants added cannot meet the usage requirements, and other flame retardants need to be added to improve its flame retardant efficiency. Summary of the Invention
[0004] The purpose of the present invention is to provide a flame-retardant EVA waterproof board and a preparation method thereof. A flame retardant is added to the EVA waterproof board, and a large number of silicon, nitrogen, and phosphorus flame retardant elements are introduced into the flame retardant, which synergistically acts with the metal hydroxide magnesium hydroxide or aluminum hydroxide, significantly improving the flame retardant performance of the EVA waterproof board. In addition, a large number of benzene rings and piperazine ring structures with a high carbon content are introduced through 4-aminothiophenol and piperazine, which can be used as a carbon source and a charring agent to further improve the flame retardant performance of the EVA waterproof board.
[0005] The technical problem to be solved by the present invention: At the present stage, the commonly used flame retardants in EVA are inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide. However, the flame retardant performance of the EVA waterproof board with only inorganic flame retardants added cannot meet the usage requirements, and other flame retardants need to be added to improve its flame retardant efficiency.
[0006] The purpose of the present invention can be achieved by the following technical solutions: A flame-retardant EVA waterproof board, comprising the following components in parts by weight: 22-30 parts of ethylene-vinyl acetate copolymer, 35-45 parts of high-density polyethylene, 20-35 parts of linear low-density polyethylene, 5-10 parts of flame retardant, 1-2.5 parts of antioxidant.
[0007] Further, the VA content of the ethylene-vinyl acetate copolymer is 15-30%.
[0008] Further, the melt index of the high-density polyethylene is 0.1 - 2.0 g / 10 min.
[0009] Further, the melt index of the linear low-density polyethylene is 0.5 - 3.0 g / 10 min.
[0010] Further, the antioxidant includes at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076.
[0011] Further, the flame-retardant EVA waterproof board further includes 0.1 - 2 parts of compatibilizer.
[0012] Further, the compatibilizer is maleic anhydride-grafted EVA, and the grafting rate is 1.2 - 1.8%.
[0013] Further, the preparation method of the flame retardant includes the following steps: A1. Add the vinyl-containing silane coupling agent into the ethanol solution, stir for 10 - 20 min, then add acetic acid to adjust the pH value to 4 - 5, raise the temperature to 35 - 40 °C, keep stirring for 1 - 2 h to obtain a vinyl-containing silane coupling agent solution; add the metal hydroxide into ethanol and deionized water, stir evenly at 35 - 40 °C to obtain a dispersion, add the vinyl-containing silane coupling agent solution into the dispersion, stir and react at 50 - 60 °C for 1 - 3 h, after the reaction ends, separate the solid, wash, and dry to obtain intermediate 1; Further, in step A1, the mass ratio of the metal hydroxide to the vinyl-containing silane coupling agent is (22 - 25):(0.5 - 1.4).
[0014] Further, in step A1, the metal hydroxide is at least one of magnesium hydroxide and aluminum hydroxide.
[0015] A2. Add intermediate 1 into N,N-dimethylformamide and ultrasonically disperse for 0.5 - 1 h, then add 4-aminothiophenol and a photoinitiator, irradiate with ultraviolet light with a wavelength of 365 nm for 0.5 - 1.5 h, filter, wash, and dry to obtain intermediate 2; Further, in step A2, the dosage ratio of intermediate 1, N,N-dimethylformamide, 4-aminothiophenol, and the photoinitiator is (5 - 6) g:(150 - 200) mL:(0.09 - 0.13) g:(0.008 - 0.012) g.
[0016] Further, in step A2, the photoinitiator is benzoin dimethyl ether.
[0017] A3. Disperse Intermediate 2 in tetrahydrofuran, dissolve phosphorus oxychloride and Acid Scavenger 1 in tetrahydrofuran, slowly add the above dispersion at room temperature, heat and react at 90 - 150 °C for 8 - 12 h, filter, wash, and dry to obtain Intermediate 3; Further, in step A3, the mass ratio of Intermediate 2, Acid Scavenger 1 and phosphorus oxychloride is (4.5 - 4.8):(0.065 - 0.075):(0.1 - 0.12).
[0018] Further, in step A3, Acid Scavenger 1 includes at least one of triethylamine, potassium carbonate, sodium carbonate, and pyridine.
[0019] A4. Disperse Intermediate 3 in dimethyl sulfoxide, then add anhydrous piperazine and Acid Scavenger 2, react at 120 - 160 °C for 2 - 5 h, filter, wash, and dry to obtain the flame retardant.
[0020] Further, in step A4, the mass ratio of Intermediate 3, anhydrous piperazine and Acid Scavenger 2 is (4 - 4.5):(0.06 - 0.08):(0.085 - 0.110).
[0021] Further, in step A4, Acid Scavenger 2 includes at least one of potassium carbonate and sodium carbonate.
[0022] In the above preparation process, first, a vinyl - containing silane coupling agent reacts with a metal hydroxide to obtain a vinyl - silane - modified metal hydroxide, i.e., Intermediate 1; then, the vinyl in Intermediate 1 undergoes a click reaction with the mercapto group on 4 - aminothiophenol to obtain Intermediate 2; then, the amino group of Intermediate 2 reacts with phosphorus oxychloride to obtain Intermediate 3; finally, Intermediate 3 reacts with piperazine to obtain the flame retardant. A large number of silicon, nitrogen, and phosphorus flame - retardant elements are introduced into the flame retardant prepared in the present invention, which synergistically acts with the metal hydroxide to significantly improve the flame - retardant performance of the EVA waterproof board. In addition, a large number of benzene rings and piperazine ring structures with a high carbon content are introduced through 4 - aminothiophenol and piperazine, which can act as a carbon source and a char - forming agent to further improve the flame - retardant performance of the EVA waterproof board.
[0023] A preparation method of a flame - retardant EVA waterproof board includes the following steps: S1. Weigh raw materials according to the weight - part ratio, add ethylene - vinyl acetate copolymer, high - density polyethylene, linear low - density polyethylene, flame retardant, and antioxidant into the mixing bin, mix and stir evenly to obtain a mixed material; S2. Add the mixed material into a single - screw extruder and gradually heat it to 180 - 210 °C for plasticization; S3. Adjust the die pre - heating, control the temperature at 200 - 230 °C, extrude through the die, and then press and form through a three - roll calender to obtain the flame - retardant EVA waterproof board.
[0024] Advantages of the present invention: (1) In the technical solution of the present invention, a large amount of silicon, nitrogen and phosphorus flame retardant elements are introduced into the prepared flame retardant, which synergistically acts with metal hydroxides to significantly improve the flame retardant performance of the EVA waterproof board. In addition, a large number of benzene rings and piperazine ring structures with a high carbon content are introduced through 4-aminothiophenol and piperazine, which can serve as a carbon source and a charring agent to further improve the flame retardant performance of the EVA waterproof board.
[0025] (2) In the technical solution of the present invention, an organic substance is grafted on the surface of the metal hydroxide, which improves the compatibility between the flame retardant and the EVA matrix, and avoids the problem of the decline in mechanical properties caused by the poor compatibility between the metal hydroxide and the EVA matrix. The EVA waterproof board prepared by the present invention has excellent mechanical properties. Specific embodiments
[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0027] Embodiment 1
[0028] This embodiment provides a preparation method of a flame retardant, including the following steps: A1. Add 0.5 g of KH570 to 10 mL of an ethanol solution with a volume fraction of 50%. After stirring for 10 min, adjust the pH value to 4 with acetic acid, raise the temperature to 35 °C, and keep stirring for 1 h to obtain a vinyl-containing silane coupling agent solution; add 22 g of magnesium hydroxide to 20 mL of ethanol and 60 mL of deionized water, stir evenly at 35 °C to obtain a dispersion liquid, add the vinyl-containing silane coupling agent solution to the dispersion liquid, stir and react at 50 °C for 1 h. After the reaction, separate the solid, wash and dry to obtain Intermediate 1; A2. Add 15 g of Intermediate 1 to 300 mL of N,N-dimethylformamide and ultrasonically disperse for 0.5 h, then add 0.27 g of 4-aminothiophenol and 0.024 g of benzoin dimethyl ether, irradiate with ultraviolet light with a wavelength of 365 nm for 0.5 h, filter, wash and dry to obtain Intermediate 2; A3. Disperse 13.5 g of Intermediate 2 in 320 mL of tetrahydrofuran. Dissolve 0.3 g of phosphorus oxychloride and 0.195 g of triethylamine in 20 mL of tetrahydrofuran, slowly add the above dispersion liquid at room temperature, heat and react at 90 °C for 8 h, filter, wash and dry to obtain Intermediate 3; A4. Disperse 12 g of Intermediate 3 in 200 mL of dimethyl sulfoxide, then add 0.18 g of anhydrous piperazine and 0.255 g of potassium carbonate, react at 120 °C for 2 h, filter, wash, and dry to obtain the flame retardant.
[0029] Example 2
[0030] This example provides a method for preparing a flame retardant, which includes the following steps: A1. Add 0.9 g of KH570 to 15 mL of an ethanol solution with a volume fraction of 6%, stir for 15 min, then add acetic acid to adjust the pH value to 4.5, raise the temperature to 40 °C, and keep stirring for 1.5 h to obtain a vinyl-containing silane coupling agent solution; add 23 g of magnesium hydroxide to 20 mL of ethanol and 60 mL of deionized water, stir evenly at 40 °C to obtain a dispersion, add the vinyl-containing silane coupling agent solution to the dispersion, and stir and react at 60 °C for 2 h. After the reaction is completed, separate the solid, wash, and dry to obtain Intermediate 1; A2. Disperse 17 g of Intermediate 1 in 400 mL of N,N-dimethylformamide by ultrasonic wave for 1 h, then add 0.34 g of 4-aminothiophenol and 0.029 g of benzoin dimethyl ether, irradiate with ultraviolet light with a wavelength of 365 nm for 1 h, filter, wash, and dry to obtain Intermediate 2; A3. Disperse 14.1 g of Intermediate 2 in 300 mL of tetrahydrofuran, dissolve 0.33 g of phosphorus oxychloride and 0.2 g of triethylamine in 20 mL of tetrahydrofuran, slowly add the above dispersion at room temperature, heat and react at 120 °C for 10 h, filter, wash, and dry to obtain Intermediate 3; A4. Disperse 13.1 g of Intermediate 3 in 200 mL of dimethyl sulfoxide, then add 0.21 g of anhydrous piperazine and 0.282 g of sodium carbonate, react at 140 °C for 3.5 h, filter, wash, and dry to obtain the flame retardant.
[0031] Example 3
[0032] This example provides a method for preparing a flame retardant, which includes the following steps: A1. Add 1.4 g of KH570 to 20 mL of an ethanol solution with a volume fraction of 80%, stir for 20 min, then add acetic acid to adjust the pH value to 5, raise the temperature to 40 °C, and keep stirring for 2 h to obtain a vinyl-containing silane coupling agent solution; add 25 g of aluminum hydroxide to 20 mL of ethanol and 60 mL of deionized water, stir evenly at 40 °C to obtain a dispersion, add the vinyl-containing silane coupling agent solution to the dispersion, and stir and react at 60 °C for 3 h. After the reaction is completed, separate the solid, wash, and dry to obtain Intermediate 1; A2. Add 18 g of Intermediate 1 to 600 mL of N,N-dimethylformamide, ultrasonically disperse for 1 h, then add 0.39 g of 4-aminothiophenol and 0.036 g of benzoin dimethyl ether, irradiate with ultraviolet light with a wavelength of 365 nm for 1.5 h, filter, wash, and dry to obtain Intermediate 2; A3. Disperse 114.4 g of Intermediate 2 in 300 mL of tetrahydrofuran. Dissolve 0.36 g of phosphorus oxychloride and 0.225 g of sodium carbonate in 20 mL of tetrahydrofuran, and slowly add it to the above dispersion at room temperature. Heat and react at 150 °C for 12 h, filter, wash, and dry to obtain Intermediate 3; A4. Disperse 13.5 g of Intermediate 3 in 200 mL of dimethyl sulfoxide, then add 0.24 g of anhydrous piperazine and 0.33 g of sodium carbonate, react at 160 °C for 4 h, filter, wash, and dry to obtain the flame retardant.
[0033] Example 4
[0034] A flame-retardant EVA waterproof board comprises the following components in parts by weight: 22 parts of ethylene-vinyl acetate copolymer, 38 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 5 parts of the flame retardant prepared in Example 2, and 1 part of antioxidant.
[0035] The VA content of the ethylene-vinyl acetate copolymer is 18%.
[0036] The melt index of the high-density polyethylene is 0.3 g / 10 min.
[0037] The melt index of the linear low-density polyethylene is 1 g / 10 min.
[0038] The antioxidant is antioxidant 1010.
[0039] The preparation method of the flame-retardant EVA waterproof board comprises the following steps: S1. Weigh the raw materials according to the weight ratio, add the ethylene-vinyl acetate copolymer, high-density polyethylene, linear low-density polyethylene, flame retardant, and antioxidant to the mixing bin, mix and stir evenly to obtain a mixed material; S2. Add the mixed material to a single-screw extruder and gradually heat it to 180-210 °C for plasticization; S3. Adjust the die head preheating, control the temperature at 215 °C, extrude through the die head, then press and form through a three-roll calender, automatically cut, wind up, and apply an information mark to obtain the flame-retardant EVA waterproof board.
[0040] Example 5
[0041] A flame-retardant EVA waterproof board comprises the following components in parts by weight: 27 parts of ethylene-vinyl acetate copolymer, 41 parts of high-density polyethylene, 29 parts of linear low-density polyethylene, 8 parts of the flame retardant prepared in Example 2, and 1.8 parts of antioxidant.
[0042] The VA content of the ethylene-vinyl acetate copolymer is 25%.
[0043] The melt index of the high-density polyethylene is 1.2 g / 10 min.
[0044] The melt index of the linear low-density polyethylene is 1.8 g / 10 min.
[0045] The antioxidant is antioxidant 1010.
[0046] A preparation method of a flame-retardant EVA waterproof board, comprising the following steps: S1. Weigh the raw materials according to the weight parts ratio, add the ethylene-vinyl acetate copolymer, high-density polyethylene, linear low-density polyethylene, flame retardant and antioxidant into the mixing bin, and mix and stir evenly to obtain a mixed material; S2. Add the mixed material into a single-screw extruder and gradually heat it to 180-210 °C for plasticization; S3. Adjust the die preheating, control the temperature at 220 °C, extrude through the die, then press and form through a three-roll calender, automatically cut, wind up, and apply an information mark to obtain a flame-retardant EVA waterproof board.
[0047] Example 6
[0048] A flame-retardant EVA waterproof board, comprising the following components in parts by weight: 30 parts of ethylene-vinyl acetate copolymer, 39 parts of high-density polyethylene, 27 parts of linear low-density polyethylene, 10 parts of the flame retardant prepared in Example 2, and 2.2 parts of antioxidant.
[0049] The VA content of the ethylene-vinyl acetate copolymer is 29%.
[0050] The melt index of the high-density polyethylene is 1.8 g / 10 min.
[0051] The melt index of the linear low-density polyethylene is 2.4 g / 10 min.
[0052] The antioxidant is antioxidant 1010.
[0053] A preparation method of a flame-retardant EVA waterproof board, comprising the following steps: S1. Weigh the raw materials according to the weight parts ratio, add the ethylene-vinyl acetate copolymer, high-density polyethylene, linear low-density polyethylene, flame retardant and antioxidant into the mixing bin, and mix and stir evenly to obtain a mixed material; S2. Add the mixture into a single-screw extruder and gradually heat it to 180 - 210 °C for plasticization; S3. Adjust the preheating of the die head, control the temperature at 230 °C, extrude through the die head, then calender and form through a three-roll calender, automatically cut, wind, and apply an information mark to obtain a flame-retardant EVA waterproof board.
[0054] Comparative Example 1 Compared with Example 5, in Comparative Example 1, the flame retardant was not grafted with piperazine, and other steps and raw materials were the same as in Example 5.
[0055] Comparative Example 2 Compared with Example 5, in Comparative Example 2, the flame retardant was not grafted with phosphorus oxychloride and piperazine, and other steps and raw materials were the same as in Example 5.
[0056] Comparative Example 3 Compared with Example 5, in Comparative Example 3, the flame retardant was magnesium hydroxide, and other steps and raw materials were the same as in Example 5.
[0057] Performance Testing (1) Mechanical properties: Test according to the standard of TB / T 3360.1 - 2023 "Railway Tunnel Waterproof Materials - Part 1: Waterproof Boards and Drainage Boards"; (2) Flame retardant properties: Test according to the standards of GB 8624 - 2012 "Classification of the Burning Behavior of Building Materials and Products" and GB / T 2406.2 - 2009 "Plastics - Determination of the Burning Behavior by the Oxygen Index Method - Part 2: Room Temperature Tests".
[0058] Table 1
[0059] It can be seen from the data in Table 1 that the EVA waterproof board prepared by the present invention has excellent mechanical properties and flame retardant properties. By comparing the data of Example 5 with those of Comparative Examples 1, 2, and 3, it can be seen that grafting phosphorus oxychloride and piperazine on the surface of magnesium hydroxide can significantly improve the flame retardant properties of the EVA waterproof board, and at the same time, can also improve the mechanical properties of the waterproof board.
[0060] In the description of the specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0061] The above content is only an example and illustration of the present invention. Those skilled in the art to which the present technology pertains may make various modifications or supplements to the described specific embodiments, or use similar ways for substitution. As long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they shall fall within the protection scope of the present invention.
Claims
1. A flame-retardant EVA waterproof board, characterized in that: It comprises components in the following parts by weight: 22 - 30 parts of ethylene - vinyl acetate copolymer, 35 - 45 parts of high - density polyethylene, 20 - 35 parts of linear low - density polyethylene, 5 - 10 parts of flame retardant, 1 - 2.5 parts of antioxidant; The preparation method of the flame retardant comprises the following steps: A1. Add a vinyl - containing silane coupling agent into an ethanol solution, stir for 10 - 20 min, then add acetic acid to adjust the pH value to 4 - 5, raise the temperature to 35 - 40 °C, keep stirring for 1 - 2 h to obtain a vinyl - containing silane coupling agent solution; Add metal hydroxide into ethanol and deionized water, stir evenly at 35 - 40 °C to obtain a dispersion liquid, add the vinyl - containing silane coupling agent solution into the dispersion liquid, stir and react at 50 - 60 °C for 1 - 3 h, after the reaction, separate the solid, wash and dry to obtain Intermediate 1; A2. Ultrasonically disperse Intermediate 1 in N,N - dimethylformamide for 0.5 - 1 h, then add 4 - aminothiophenol and a photoinitiator, irradiate with ultraviolet light with a wavelength of 365 nm for 0.5 - 1.5 h, filter, wash and dry to obtain Intermediate 2; A3. Disperse Intermediate 2 in tetrahydrofuran, dissolve phosphorus oxychloride and Acid - binding agent 1 in tetrahydrofuran, slowly add the above - mentioned dispersion liquid at room temperature, heat and react at 90 - 150 °C for 8 - 12 h, filter, wash and dry to obtain Intermediate 3; A4. Disperse Intermediate 3 in dimethyl sulfoxide, then add anhydrous piperazine and Acid - binding agent 2, react at 120 - 160 °C for 2 - 5 h, filter, wash and dry to obtain the flame retardant.
2. The flame-retardant EVA waterproof board according to claim 1, wherein: The VA content of the ethylene - vinyl acetate copolymer is 15 - 30%.
3. A flame-retardant EVA waterproof board according to claim 1, characterized in that: The melt index of the high - density polyethylene is 0.1 - 2.0 g / 10 min; the melt index of the linear low - density polyethylene is 0.5 - 3.0 g / 10 min.
4. A flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A1, the mass ratio of the metal hydroxide to the vinyl - containing silane coupling agent is (22 - 25):(0.5 - 1.4).
5. A flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A1, the metal hydroxide is at least one of magnesium hydroxide and aluminum hydroxide.
6. The flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A2, the dosage ratio of Intermediate 1, N,N - dimethylformamide, 4 - aminothiophenol and the photoinitiator is (5 - 6) g:(150 - 200) mL:(0.09 - 0.13) g:(0.008 - 0.012) g.
7. A flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A2, the photoinitiator is benzoin dimethyl ether.
8. A flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A3, the mass ratio of Intermediate 2, Acid - binding agent 1 and phosphorus oxychloride is (4.5 - 4.8):(0.065 - 0.075):(0.1 - 0.12).
9. The flame-retardant EVA waterproof board according to claim 1, characterized in that: In the step A4, the mass ratio of Intermediate 3, anhydrous piperazine and Acid - binding agent 2 is (4 - 4.5):(0.06 - 0.08):(0.085 - 0.110).
10. A method for preparing a flame-retardant EVA waterproof board according to any one of claims 1-9, characterized in that: It comprises the following steps: S1. Weigh raw materials according to the weight - part ratio, add ethylene - vinyl acetate copolymer, high - density polyethylene, linear low - density polyethylene, flame retardant and antioxidant into a mixing bin, mix and stir evenly to obtain a mixed material; S2. Add the mixture into a single-screw extruder and gradually heat it to 180 - 210 °C for plasticization; S3. Adjust the preheating of the die head, control the temperature at 200 - 230 °C, extrude through the die head, and then calender and form through a three-roll calender to obtain a flame-retardant EVA waterproof board.