Flame-retardant directional waterproof board

Abstract

The invention relates to the technical field of waterproof building materials, and discloses a flame-retardant directional waterproof plate which comprises a modified polyethylene base plate and trapezoidal directional bulge units arranged at intervals along the length direction of the base plate, the substrate and the bulge units are prepared from the following material components in parts by weight: 65 to 75 parts of high-density polyethylene, 2 to 5 parts of maleic anhydride grafted high-density polyethylene, 4 to 5 parts of modified montmorillonite, 1 to 2 parts of modified pentaerythritol ester, 0.2 to 0.5 part of antioxidant 1010, 0.5 to 0.6 part of calcium stearate and 0.4 to 0.5 part of dioctyl phthalate. The modified montmorillonite is prepared through modification of the vanillic aldehyde-based flame retardant, the modified montmorillonite and the modified pentaerythritol ester form a composite flame-retardant system, and directional waterproofness is achieved through the trapezoidal protruding units. The product disclosed by the invention has excellent flame retardant property, directional waterproof function and stable mechanical property, is suitable for various scenes such as underground engineering, tunnels, roof waterproofing and the like, and is simple in preparation process.

Description

Technical Field

[0001] This invention relates to the field of waterproof building materials technology, specifically a flame-retardant directional waterproof board. Background Technology

[0002] Waterproofing membranes, as an important building waterproofing material, are widely used in underground engineering, roof waterproofing, tunnels, water conservancy projects, and many other fields. Their main function is to prevent water penetration and protect building structures from water erosion. However, with the increasing demands for fire safety and waterproofing performance in the construction industry, traditional waterproofing membranes have gradually revealed many shortcomings.

[0003] Existing waterproofing membranes are mostly made of single polymer materials, such as polyethylene and polyvinyl chloride. While they possess some waterproofing properties, their flame-retardant properties are poor. They are easily flammable in high-temperature or fire environments, releasing toxic and harmful gases during combustion, which not only exacerbates the spread of fire but also poses a serious threat to human life. Furthermore, the waterproofing direction of traditional waterproofing membranes is relatively dispersed, making it difficult to achieve directional blocking of water penetration. In scenarios with specific water flow directions (such as tunnel sidewalls and underground parking garage ramps), the waterproofing effect is poor, and leakage problems are prone to occur. In addition, some improved flame-retardant waterproofing membranes enhance their flame-retardant performance by adding large amounts of flame retardants, but excessive flame retardants can lead to a decrease in the mechanical properties of the waterproofing membrane, such as reduced tensile strength. Therefore, developing a flame-retardant directional waterproofing membrane that combines excellent flame-retardant properties, directional waterproofing function, and good mechanical properties has become an urgent technical problem to be solved in the current waterproofing building materials field. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a flame-retardant directional waterproof membrane that possesses good flame-retardant, antibacterial, and mechanical properties, while also preventing water penetration.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a flame-retardant oriented waterproof board, comprising a modified polyethylene substrate and trapezoidal oriented protrusion units spaced apart along the length of the substrate; the material composition of the modified polyethylene substrate and the protrusion units by weight percentage is: 65-75 parts by weight of high-density polyethylene, 2-5 parts by weight of maleic anhydride-grafted high-density polyethylene, 4-5 parts by weight of modified montmorillonite, 1-2 parts by weight of modified pentaerythritol ester, 0.2-0.5 parts by weight of antioxidant 1010, 0.5-0.6 parts by weight of calcium stearate, and 0.4-0.5 parts by weight of dioctyl phthalate.

[0006] Furthermore, the preparation method of the modified montmorillonite is as follows: S1. Dissolve sodium hydroxide in 50-60g of water, cool to room temperature, add vanillin under nitrogen atmosphere, stir at 75-80℃ for 0.5-1h, then continue to add 3-chloro-1,2-propanediol, heat to 95-100℃ and react for 4-5h, after which extract with n-butanol, wash the organic phase with water, concentrate by rotary evaporation, recrystallize with ethyl acetate and n-hexane, filter and dry to obtain intermediate 1; S2. Add intermediate 1 and 1-(3-aminopropyl)imidazolium to anhydrous ethanol, and react at 75-80℃ for 8-10 h under nitrogen atmosphere and reflux. After the reaction is completed, rotary distillation is performed to obtain imidazolium-modified vanillin. S3. Add dimethyl methylphosphonate, imidazole-modified vanillin, and sodium hydroxide to a reaction flask, heat to 150-160℃ and react for 30-35 hours. After the reaction is completed, distill under reduced pressure to obtain vanillin-based flame retardant. S4. Add 10-15 mmol of γ-aminopropyltriethoxysilane and 5-6 g of montmorillonite to a mixed solution of 15 mL of ethanol and 10 mL of water, and react at 76-80 °C. Continue to add 1-1.5 mmol of vanillin-based flame retardant, adjust the pH to 4 with dilute hydrochloric acid, and continue the reaction for 10-12 h while maintaining the temperature. After the reaction is completed, cool to room temperature, centrifuge, and wash until the pH is neutral to obtain modified montmorillonite.

[0007] Furthermore, in S1, the ratio of sodium hydroxide, vanillin, and 3-chloro-1,2-propanediol is 4-5g: 15.13-16.25g: 10.3-11.05g.

[0008] Furthermore, in S2, the ratio of anhydrous ethanol, intermediate 1, and 1-(3-aminopropyl)imidazole is 25-30g: 7-8g: 0.04-0.05mol.

[0009] Furthermore, in S3, the ratio of dimethyl methylphosphonate, imidazole-modified vanillin, and sodium hydroxide is 2-3 mmol: 3-4.5 mmol: 0.01-0.02 g.

[0010] Furthermore, in S4, the reaction time is 3-4 hours.

[0011] Further, the modified pentaerythritol ester is prepared by adding 1-2 mmol fumaric acid, 2-4 mmol pentaerythritol and 0.01-0.02 g p-toluenesulfonic acid into a reaction flask, then adding 3-5 mL cyclohexane as a dehydrating agent, stirring and refluxing at 175-180 °C for 2-4 h, after which cyclohexane is removed by vacuum distillation, and the mixture is washed with anhydrous ethanol to obtain the modified pentaerythritol ester.

[0012] Furthermore, the preparation method of the flame-retardant oriented waterproof membrane is as follows: high-density polyethylene, maleic anhydride-grafted high-density polyethylene, modified montmorillonite, modified pentaerythritol ester, antioxidant 1010, calcium stearate, and dioctyl phthalate are added to a high-speed mixer and mixed at 130-140℃ for 30-40 minutes; the mixture is fed into a twin-screw extruder and plasticized and extruded at 180-200℃, and the substrate and oriented protrusion unit are integrally formed through a customized mold; the extruded sheet is calendered by a three-roll calender and then cooled to room temperature by a cooling roller group; it is cut and wound to obtain the finished product.

[0013] (iii) Beneficial technical effects The modified montmorillonite in this invention undergoes a four-step modification process, grafting phosphorus-containing dimethyl methylphosphonate, nitrogen-containing imidazole groups, and vanillin groups onto the montmorillonite interlayer. During combustion, phosphorus forms a phosphate ester-based flame-retardant protective layer, inhibiting the release of volatile combustible gases; nitrogen decomposes to produce inert gases such as ammonia and nitrogen, diluting the oxygen concentration; simultaneously, the silane coupling effect of γ-aminopropyltriethoxysilane ensures a tight interface between montmorillonite and the polyethylene substrate, preventing the migration and loss of the flame retardant and ensuring long-term flame-retardant stability. This invention uses maleic anhydride-grafted high-density polyethylene as a compatibilizer. The maleic anhydride groups can chemically react with the hydroxyl groups on the surface of the modified montmorillonite and the hydroxyl groups of the modified pentaerythritol ester, reducing the interfacial tension between components and allowing the inorganic flame retardant (montmorillonite) to be uniformly dispersed in the organic substrate, avoiding agglomeration that leads to a decrease in mechanical properties. The layered structure of modified montmorillonite forms a "reinforcing network" within the substrate. When the material is subjected to tensile forces, the montmorillonite layers hinder molecular chain slippage, significantly improving tensile strength and elongation at break. Simultaneously, the multifunctional structure of modified pentaerythritol esters can form cross-links, enhancing the material's mechanical properties. The trapezoidal raised units of the waterproof membrane are made with the same components as the substrate, ensuring overall structural consistency and stability, and preventing cracking and leakage at the joints due to material differences. The inclined surface of the trapezoidal structure guides water flow along the length of the substrate, preventing localized water accumulation and achieving directional barrier against seepage, making it particularly suitable for applications with specific water flow directions, such as tunnel sidewalls and underground parking garage ramps. The substrate and raised units are integrally molded without seams, solving the problem of easy leakage at joints in traditional waterproof membranes. In the preparation of modified montmorillonite, 1-(3-aminopropyl)imidazolium is grafted into the molecule structure of vanillin through step S2 to form imidazolium-modified vanillin, in which the imidazolium group plays a good antibacterial role; modified pentaerythritol ester, as an auxiliary compatibilizer, can promote the uniform dispersion of modified montmorillonite in the substrate, avoid antibacterial dead zones caused by the aggregation of antibacterial components, and ensure the consistency of the overall antibacterial performance of the waterproof board. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the flame-retardant directional waterproof membrane in Example 1.

[0015] Figure 2 It is the reaction formula of the modified pentaerythritol ester in Example 1. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0018] Maleic anhydride grafted onto high-density polyethylene, with a grafting rate of 1.1%. The concentration of dilute hydrochloric acid is 0.1 mol / L.

[0019] Example 1

[0020] A flame-retardant oriented waterproof membrane includes a modified polyethylene substrate and trapezoidal oriented protrusions spaced apart along the length of the substrate; the material composition of the modified polyethylene substrate and the protrusions is as follows by weight percentage: 65 parts by weight of high-density polyethylene, 2 parts by weight of maleic anhydride-grafted high-density polyethylene, 4 parts by weight of modified montmorillonite, 1 part by weight of modified pentaerythritol ester, 0.2 parts by weight of antioxidant 1010, 0.5 parts by weight of calcium stearate, and 0.4 parts by weight of dioctyl phthalate.

[0021] The preparation method of the modified montmorillonite is as follows: S1. Dissolve 4g of sodium hydroxide in 50g of water, cool to room temperature, add 15.13g of vanillin under nitrogen atmosphere, stir at 75℃ for 0.5h, then add 10.3g of 3-chloro-1,2-propanediol, heat to 95℃ and react for 4h. After the reaction is complete, extract with n-butanol, wash the organic phase with water, concentrate by rotary evaporation, recrystallize with ethyl acetate and n-hexane, filter and dry to obtain intermediate 1; S2. Add 7g of intermediate 1 and 0.04mol of 1-(3-aminopropyl)imidazol to 25g of anhydrous ethanol. Under nitrogen atmosphere and reflux, heat to 75℃ and react for 8h. After the reaction is completed, rotary distillation is performed to obtain imidazolium-modified vanillin. S3. Add 2 mmol of dimethyl methylphosphonate, 3 mmol of imidazole-modified vanillin, and 0.01 g of sodium hydroxide to a reaction flask, heat to 150℃ and react for 30 h. After the reaction is completed, distill under reduced pressure to obtain vanillin-based flame retardant. S4. Add 10 mmol of γ-aminopropyltriethoxysilane and 5 g of montmorillonite to a mixed solution of 15 mL of ethanol and 10 mL of water, and react at 76 °C for 3 h. Then add 1 mmol of vanillin-based flame retardant, adjust the pH to 4 with dilute hydrochloric acid, and continue the reaction at a constant temperature for 10 h. After the reaction is completed, cool to room temperature, centrifuge, and wash until the pH is neutral to obtain modified montmorillonite.

[0022] The modified pentaerythritol ester is prepared by adding 1 mmol fumaric acid, 2 mmol pentaerythritol and 0.01 g p-toluenesulfonic acid into a reaction flask, then adding 3 mL cyclohexane as a dehydrating agent, stirring and refluxing at 175 °C for 2 h, and after the reaction, removing the cyclohexane by vacuum distillation, and washing with anhydrous ethanol to obtain the modified pentaerythritol ester.

[0023] The preparation method of the flame-retardant oriented waterproof board is as follows: high-density polyethylene, maleic anhydride-grafted high-density polyethylene, modified montmorillonite, modified pentaerythritol ester, antioxidant 1010, calcium stearate, and dioctyl phthalate are added to a high-speed mixer and mixed at 130°C for 30 minutes; the mixture is fed into a twin-screw extruder and plasticized and extruded at 180°C; the substrate and oriented protrusion unit are integrally formed through a customized mold; the extruded board is calendered by a three-roll calender and then cooled to room temperature by a cooling roller assembly; it is then cut and wound to obtain the finished product.

[0024] Figure 1 In the middle, the total length extending horizontally along the component is 3000mm (marked by the green dimension line at the bottom of the drawing). The total length of the "protruding band" in the middle is 2700mm, which is composed of 225 protruding units. The center-to-center distance between adjacent protrusions is 12mm (i.e., 12×225=2700mm, marked by "12×225" and the horizontal green dimension line at the top of the drawing). The flat areas on both sides of the protruding band are each 150mm long (marked by the green dimension lines on the left and right sides). The total length relationship is: 2700+150×2=3000mm.

[0025] Example 2

[0026] A flame-retardant oriented waterproof membrane includes a modified polyethylene substrate and trapezoidal oriented protrusions spaced apart along the length of the substrate; the material composition of the modified polyethylene substrate and the protrusions is as follows by weight percentage: 75 parts by weight of high-density polyethylene, 5 parts by weight of maleic anhydride-grafted high-density polyethylene, 5 parts by weight of modified montmorillonite, 2 parts by weight of modified pentaerythritol ester, 0.5 parts by weight of antioxidant 1010, 0.6 parts by weight of calcium stearate, and 0.5 parts by weight of dioctyl phthalate.

[0027] The preparation method of the modified montmorillonite is as follows: S1. Dissolve 5g of sodium hydroxide in 60g of water, cool to room temperature, add 16.25g of vanillin under nitrogen atmosphere, stir at 80℃ for 1h, then add 11.05g of 3-chloro-1,2-propanediol, heat to 100℃ and react for 5h. After the reaction is complete, extract with n-butanol, wash the organic phase with water, concentrate by rotary evaporation, recrystallize with ethyl acetate and n-hexane, filter and dry to obtain intermediate 1; S2. Add 8g of intermediate 1 and 0.05mol of 1-(3-aminopropyl)imidazolium to 30g of anhydrous ethanol. Under nitrogen atmosphere and reflux, heat to 80℃ and react for 10h. After the reaction is completed, rotary distillation is performed to obtain imidazolium-modified vanillin. S3. Add 3 mmol of dimethyl methylphosphonate, 4.5 mmol of imidazole-modified vanillin, and 0.02 g of sodium hydroxide to a reaction flask, heat to 160 °C and react for 35 h. After the reaction is completed, distill under reduced pressure to obtain vanillin-based flame retardant. S4. Add 15 mmol of γ-aminopropyltriethoxysilane and 6 g of montmorillonite to a mixed solution of 15 mL of ethanol and 10 mL of water, and react at 80 °C for 4 h. Then add 1.5 mmol of vanillin-based flame retardant, adjust the pH to 4 with dilute hydrochloric acid, and continue the reaction at a constant temperature for 12 h. After the reaction is completed, cool to room temperature, centrifuge, and wash until the pH is neutral to obtain modified montmorillonite.

[0028] The modified pentaerythritol ester is prepared by adding 2 mmol fumaric acid, 4 mmol pentaerythritol and 0.02 g p-toluenesulfonic acid into a reaction flask, then adding 5 mL cyclohexane as a dehydrating agent, stirring and refluxing at 180 °C for 4 h, and after the reaction, removing cyclohexane by vacuum distillation, and washing with anhydrous ethanol to obtain the modified pentaerythritol ester.

[0029] The preparation method of the flame-retardant oriented waterproof board is as follows: high-density polyethylene, maleic anhydride-grafted high-density polyethylene, modified montmorillonite, modified pentaerythritol ester, antioxidant 1010, calcium stearate, and dioctyl phthalate are added to a high-speed mixer and mixed at 140°C for 40 minutes; the mixture is fed into a twin-screw extruder and plasticized and extruded at 200°C; the substrate and oriented protrusion unit are integrally formed through a customized mold; the extruded board is calendered by a three-roll calender and then cooled to room temperature by a cooling roller assembly; it is then cut and wound to obtain the finished product.

[0030] Example 3

[0031] A flame-retardant oriented waterproof membrane includes a modified polyethylene substrate and trapezoidal oriented protrusions spaced apart along the length of the substrate; the material composition of the modified polyethylene substrate and the protrusions is as follows by weight percentage: 70 parts by weight of high-density polyethylene, 3 parts by weight of maleic anhydride-grafted high-density polyethylene, 4.5 parts by weight of modified montmorillonite, 1.5 parts by weight of modified pentaerythritol ester, 0.3 parts by weight of antioxidant 1010, 0.55 parts by weight of calcium stearate, and 0.45 parts by weight of dioctyl phthalate.

[0032] The preparation method of the modified montmorillonite is as follows: S1. Dissolve 4.5g sodium hydroxide in 55g water, cool to room temperature, add 15.69g vanillin under nitrogen atmosphere, stir at 78℃ for 0.75h, then add 10.67g 3-chloro-1,2-propanediol, heat to 98℃ and react for 4h. After the reaction is complete, extract with n-butanol, wash the organic phase with water, concentrate by rotary evaporation, recrystallize with ethyl acetate and n-hexane, filter and dry to obtain intermediate 1; S2. Add 7.5g of intermediate 1 and 0.045mol of 1-(3-aminopropyl)imidazolium to 28g of anhydrous ethanol. Under nitrogen atmosphere and reflux, the mixture is heated to 77℃ and reacted for 9h. After the reaction is completed, the mixture is rotary distilled to obtain imidazolium-modified vanillin. S3. Add 2.5 mmol dimethyl methylphosphonate, 3.75 mmol imidazole-modified vanillin, and 0.015 g sodium hydroxide to a reaction flask, heat to 155 °C and react for 32 h. After the reaction is completed, distill under reduced pressure to obtain vanillin-based flame retardant. S4. Add 13 mmol of γ-aminopropyltriethoxysilane and 5.5 g of montmorillonite to a mixed solution of 15 mL of ethanol and 10 mL of water, and react at 78 °C for 4 h. Then add 1.3 mmol of vanillin-based flame retardant, adjust the pH to 4 with dilute hydrochloric acid, and continue the reaction at a constant temperature for 11 h. After the reaction is completed, cool to room temperature, centrifuge, and wash until the pH is neutral to obtain modified montmorillonite.

[0033] The modified pentaerythritol ester is prepared by adding 1.5 mmol fumaric acid, 3 mmol pentaerythritol and 0.015 g p-toluenesulfonic acid into a reaction flask, then adding 4 mL cyclohexane as a dehydrating agent, stirring and refluxing at 178 °C for 3 h, and after the reaction, removing cyclohexane by vacuum distillation, and washing with anhydrous ethanol to obtain the modified pentaerythritol ester.

[0034] The preparation method of the flame-retardant oriented waterproof board is as follows: high-density polyethylene, maleic anhydride-grafted high-density polyethylene, modified montmorillonite, modified pentaerythritol ester, antioxidant 1010, calcium stearate, and dioctyl phthalate are added to a high-speed mixer and mixed at 135°C for 35 minutes; the mixture is fed into a twin-screw extruder and plasticized and extruded at 190°C, and the substrate and oriented protrusion unit are integrally formed through a customized mold; the extruded board is calendered by a three-roll calender and then cooled to room temperature by a cooling roller assembly; it is then cut and wound to obtain the finished product.

[0035] Comparative Example 1 The difference between this comparative example and Example 3 is that intermediate 1 is used instead of modified montmorillonite.

[0036] Comparative Example 2 The difference between this comparative example and Example 3 is that pentaerythritol was used instead of modified pentaerythritol ester.

[0037] Flame retardancy and barrier properties were tested according to GB / T2406.2-2009 and GB / T2408-2021; antibacterial properties were tested according to GB / T18173.1-2019 "Polymer Waterproof Materials Part 1: Sheets"; antibacterial properties were tested according to GB / T31402-2023; and tensile properties were tested according to GB / T1040.2-2022.

[0038] Table 1: Performance Tests

[0039] As shown in Table 1, the flame-retardant directional waterproof membrane of the present invention has good flame-retardant, antibacterial, waterproof and mechanical properties.

[0040] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0042] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments.

Claims

1. A flame-retardant oriented waterproof sheet, characterized by, The modified polyethylene base plate and the trapezoidal directional convex unit arranged along the length direction of the base plate, the material components of the modified polyethylene base plate and the convex unit are as follows: 65-75 weight parts of high-density polyethylene, 2-5 weight parts of maleic anhydride grafted high-density polyethylene, 4-5 weight parts of modified montmorillonite, 1-2 weight parts of modified pentaerythritol ester, 0.2-0.5 weight parts of antioxidant 1010, 0.5-0.6 weight parts of calcium stearate, and 0.4-0.5 weight parts of dioctyl phthalate.

2. The fire-retardant oriented strand board of claim 1, wherein, The preparation method of the modified montmorillonite is as follows: S1. Sodium hydroxide is dissolved in 50-60 g of water, cooled to room temperature, and then vanillin is added under nitrogen atmosphere, stirred at 75-80 DEG C for 0.5-1 h, and then 3-chloro-1,2-propanediol is continuously added, heated to 95-100 DEG C for 4-5 h, after the reaction is completed, n-butanol is extracted, the organic phase is washed with water, concentrated by rotary evaporation, recrystallized with ethyl acetate and n-hexane, filtered and dried to obtain intermediate 1; S2. Intermediate 1 and 1-(3-aminopropyl)imidazole are added to anhydrous ethanol, heated to 75-80 DEG C under nitrogen atmosphere and condensation reflux for 8-10 h, and then rotary evaporation is performed to obtain imidazole-modified vanillin; S3. Dimethyl methylphosphonate, imidazole-modified vanillin and sodium hydroxide are added to a reaction bottle, heated to 150-160 DEG C for 30-35 h, and then distilled under reduced pressure to obtain a vanillin-based flame retardant; S4. 10-15 mmol of gamma-aminopropyl triethoxysilane and 5-6 g of montmorillonite are added to a mixed solution of 15 mL of ethanol and 10 mL of water, reacted at 76-80 DEG C, 1-1.5 mmol of vanillin-based flame retardant is continuously added, the pH is adjusted to 4 with dilute hydrochloric acid, the temperature is kept unchanged, and the reaction is continuously carried out for 10-12 h, then cooled to room temperature, washed until the pH is neutral after centrifugation to obtain modified montmorillonite.

3. The fire-retardant oriented strand board of claim 2, wherein, In S1, the amount ratio of sodium hydroxide, vanillin and 3-chloro-1,2-propanediol is 4-5 g: 15.13-16.25 g: 10.3-11.05 g.

4. The fire-retardant oriented strand board of claim 2, wherein, In S2, the amount ratio of anhydrous ethanol, intermediate 1 and 1-(3-aminopropyl)imidazole is 25-30 g: 7-8 g: 0.04-0.05 mol.

5. The fire-retardant oriented strand board of claim 2, wherein, In S3, the amount ratio of dimethyl methylphosphonate, imidazole-modified vanillin and sodium hydroxide is 2-3 mmol: 3-4.5 mmol: 0.01-0.02 g.

6. The fire-retardant oriented strand board of claim 2, wherein The reaction time in S4 is 3-4 h.

7. The fire-retardant oriented strand board of claim 1, wherein The preparation method of the modified pentaerythritol ester is as follows: 1-2 mmol of fumaric acid, 2-4 mmol of pentaerythritol and 0.01-0.02 g of p-toluenesulfonic acid are added to a reaction bottle, then 3-5 mL of cyclohexane is added as a water-carrying agent, stirred and refluxed at 175-180 DEG C for 2-4 h, after the reaction is completed, the cyclohexane is removed by distillation under reduced pressure, washed with anhydrous ethanol to obtain modified pentaerythritol ester.

8. A method for producing a flame-retardant oriented waterproof sheet as claimed in any one of claims 1 to 7, characterized by, The preparation method of the flame-retardant oriented waterproof plate is as follows: high-density polyethylene, maleic anhydride grafted high-density polyethylene, modified montmorillonite, modified pentaerythritol ester, antioxidant 1010, calcium stearate and dioctyl phthalate are added into a high-speed mixer and mixed at 130-140 DEG C for 30-40 min; the mixed material is sent into a double-screw extruder and plasticized and extruded at 180-200 DEG C, and the base plate and the oriented protruding unit are integrally formed through a customized mold; the extruded plate is polished through a three-roller polishing machine, and then cooled to room temperature through a cooling roller group; and the finished product is obtained through cutting and winding.

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