Biodegradable flame-retardant heat-insulating fireproof pad and preparation method thereof

Abstract

The invention relates to a biodegradable flame-retardant heat-insulation fireproof pad and a preparation method thereof. The biodegradable flame-retardant heat-insulation fireproof pad comprises the following components: a base material, a binder and a solvent, the base material comprises a fiber felt, and the fiber felt is HLGX soluble ceramic fiber paper. The adhesive comprises silica sol. The curing agent comprises phosphoric acid. The solvent comprises purified water. The fireproof plate has the effect of improving the flame-retardant and heat-insulating performance of the fireproof plate. The used materials can be degraded by 100%, and environmental protection is facilitated.

Description

Technical Field

[0001] The present application relates to the field of fireproof mats, and in particular to a biodegradable flame-retardant and heat-insulating fireproof mat and a preparation method thereof. Background Art

[0002] With the development of the automotive industry and the advancement of new energy technologies, new energy vehicle power batteries are also developing rapidly.

[0003] The fire resistance of new energy batteries has also attracted widespread attention. Fireproofing pads in new energy batteries are crucial components for improving battery safety. These pads primarily consist of mica sheets or foam foam. If a runaway fire occurs, it can be dangerous. Furthermore, these mica sheets and foam foam are non-degradable, placing significant pressure on environmental protection. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides a biodegradable flame retardant heat insulating fireproof mat and a preparation method thereof.

[0005] In the first aspect, the present application provides a degradable flame retardant heat insulating fireproof mat, which adopts the following technical solution: A biodegradable flame retardant heat-insulating fireproof mat, comprising the following components: Base material, connector, purified water, phosphoric acid; The substrate is fiber felt, which is HLGX calcium magnesium silicate ceramic fiber paper.

[0006] By adopting the above technical solution, the base material of the fireproof mat adopts HLGX calcium magnesium silicate ceramic fiber paper. It has excellent flame retardant properties, which effectively improves the flame retardant properties of the fireproof mat, thereby delaying combustion and further improving the overall flame retardant properties of the fireproof mat. At the same time, the porous structure of the inorganic fiber felt can adsorb volatiles, effectively reducing the gas phase combustion reaction, further improving the overall flame retardant properties of the fireproof mat. Phosphoric acid is also added to the fireproof mat to further play a synergistic flame retardant role. HLGX is a soluble ceramic fiber paper. This fiber paper not only has good fire resistance and thermal insulation properties, but also has high solubility and biodegradability. It can be naturally degraded in the natural environment and will not cause pollution to the environment.

[0007] Preferably, the linker is silica sol. Silica sol gels, and the dissociated substances rearrange to form a stable gel, which ultimately decomposes into silicon dioxide and water.

[0008] Preferably, the solvent comprises purified water.

[0009] Preferably, the substrate further comprises a polylactic acid modified compound, and the raw materials of the polylactic acid modified compound comprise an ammonium phosphate compound, polylactic acid and polybutylene adipate / terephthalate.

[0010] By adopting the above-mentioned technical means, polylactic acid has certain thermal insulation properties and can achieve good thermal insulation effect with the fiber felt substrate. At the same time, mixing the ammonium phosphate complex with polylactic acid can further improve the flame retardant properties of polylactic acid, thereby making the system have good flame retardant properties. The addition of poly(butylene adipate) / terephthalate can further improve the overall compatibility of the system, thereby making the prepared polylactic acid modified complex have good and stability.

[0011] Preferably, the ammonium polyphosphate complex is prepared by the following method: The ammonium polyphosphate is mixed with water to obtain an ammonium polyphosphate dispersion; acetic acid, water and chitosan are mixed and added to the ammonium polyphosphate dispersion to obtain a mixed solution; the mixed solution is stirred and then centrifuged; the mixed solution is washed to obtain chitosan polyammonium phosphate; the chitosan polyammonium phosphate is mixed with water, tannic acid and water are added, the mixed solution is stirred and then centrifuged and washed; and the mixed solution is dried to obtain an ammonium polyphosphate complex.

[0012] By adopting the above technical solution, chitosan is a polysaccharide with rich amino and hydroxyl groups, which plays a good protective role. Tannic acid is a natural polyphenol, and the phenolic hydroxyl groups therein can provide action points, thereby further improving the compatibility of the prepared ammonium polyphosphate complex, and improving the overall stability of the system, and can improve the stability of the core-shell structure. Tannic acid also has good antioxidant zinc, which can effectively reduce the generation of free radicals and ships during the combustion process, further improving the overall flame retardant performance of the system. Chitosan and tannic acid are compounded to form a shell structure, and sodium polyphosphate is used as the shell structure. A core-shell structure is formed through a cross-linking agent, which improves the compatibility between ammonium polyphosphate and polylactic acid. The prepared polylactic acid modified composite constructs a stereostructured core-shell system, further improving the overall flame retardancy of the system.

[0013] Preferably, the mass ratio of the ammonium polyphosphate, chitosan and tannic acid is (8-10):1:2.

[0014] By adopting the above technical solution, preferably the mass ratio of ammonium polyphosphate, chitosan and tannic acid is within the above range, which can further improve the overall stability of the prepared polylactic acid modified composite.

[0015] Preferably, the polylactic acid modified composite is prepared by the following method: The polylactic acid and ammonium polyphosphate compound is mixed with polyadipate / butylene terephthalate and then extruded to obtain prefabricated fiber filaments, and the prefabricated fiber filaments are stretched and then annealed to obtain the polylactic acid modified compound.

[0016] Preferably, the mass ratio of the ammonium polyphosphate composite, polylactic acid and poly(butylene adipate / terephthalate) is (1.2-1.4):15:1.

[0017] By adopting the above technical solution, the mass ratio of the ammonium polyphosphate composite, polylactic acid and poly(butylene adipate / terephthalate) is preferably within the above range, which can further improve the overall stability of the prepared polylactic acid modified composite.

[0018] In a second aspect, the present application provides a method for preparing a biodegradable flame retardant, heat-insulating and fireproof mat, which adopts the following technical solution: A method for preparing a biodegradable flame retardant heat-insulating fireproof mat comprises the following steps: S1, filling the substrate with a 20% silica sol solution to obtain a pre-treated substrate; S2. Silica sol, purified water, and phosphoric acid were mixed, added to a reactor, stirred at 80-100° C. for 120 min, and then cooled to room temperature to obtain a binder; S3. Applying an adhesive to the surface of the pre-treated substrate, and then hot pressing to obtain a degradable flame retardant heat-insulating fireproof mat.

[0019] Preferably, in step S3, the hot pressing pressure is 90-110 kg / cm 2 , the hot pressing temperature is 240-250℃, and the hot pressing time is 150-180min.

[0020] By adopting the above technical solution, preferably all conditions during hot pressing are within the above ranges, which can effectively improve the overall stability of the prepared fireproof mat.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The HLGX ceramic fiber paper used as the base material in the fireproof mat has excellent flame retardant properties, which effectively improves the flame retardant properties of the fireproof mat, plays a role in delaying combustion, and further improves the overall flame retardant properties of the fireproof mat. At the same time, the porous structure of the inorganic fiber felt can absorb volatiles, effectively reducing the gas phase combustion reaction, further improving the overall flame retardant properties of the fireproof mat. Phosphoric acid and flame retardants are also added to the fireproof mat to further achieve synergistic flame retardant properties; the long-term working temperature reaches above 1200°C.

[0022] 2. The ammonium phosphate complex is prepared from ammonium polyphosphate, a crosslinker, chitosan, and tannic acid. Chitosan, rich in amino and hydroxyl groups, provides a protective effect. Tannic acid, a natural polyphenol, provides a site of action. After coating the ammonium polyphosphate, it improves the compatibility between the ammonium polyphosphate and polylactic acid, creating a stereostructured core-shell system. This further enhances the overall flame retardancy and stability of the substrate, allowing it to withstand temperatures of 1200°C for several hours without burning.

[0023] 3. The ammonium polyphosphate compound has good flame retardant effect. At the same time, through mechanisms such as thermal decomposition and heat absorption, it has good thermal insulation performance in the system, so that the degradable thermal insulation and fireproof mat prepared in this application has good green environmental protection performance, and has a small thermal conductivity and good thermal insulation performance.

[0024] 4.HLGX ceramic fiber paper is highly soluble and can be degraded in human body fluids and natural environments. The dissolution rate reaches 100ng / cm 2 This rapid degradation property enables HLGX ceramic fiber paper to decompose quickly in the human body and the natural environment, thereby reducing health risks and environmental pollution. DETAILED DESCRIPTION

[0025] The present application is further described in detail below with reference to the embodiments: The degradable flame-retardant, heat-insulating and fire-proof mat in the present application can be used in new energy vehicle power batteries and energy storage batteries, thereby improving the flame retardant properties of the battery and the degradability of waste materials.

[0026] Raw materials: All raw materials in the examples are commercially available; the nano aerogel powder is silica aerogel powder; the flame retardant is trimethyl phosphate (CAS No.: 512-56-1), and the silane coupling agent is 3-aminopropyltriethoxysilane (CAS No.: 919-30-2).

[0027] Example 1 Preparation of biodegradable flame retardant thermal insulation mats: S1. Cut 60 sheets of HLGX ceramic fiber paper into a size of 102cm×61cm, place them in a rectangular container, and soak them in a silica sol solution with a mass concentration of 20% for 36 hours at 20mpa / cm 2 The substrate was squeezed and dehydrated under pressure of 100-120° C. and dried in an oven at 100-120° C. for 30 min to obtain a substrate; S2, mixing 60 parts of silica sol, 40 parts of purified water, and 3 parts of phosphoric acid to obtain a mixture; S3. Add the mixture into a reactor, stir at 80-100° C. for 120 min, and cool naturally to room temperature to obtain a binder; S4, applying the adhesive to the surface of the substrate, placing it in an oven, and drying it at a temperature of 120-130° C. for 20 minutes to obtain a pretreated plate; S5, pre-treated plate at 100kg / cm 2 Under a strong pressure, it was pressed at a temperature of 240-250°C for 3 hours, then naturally cooled to room temperature, and cut into 200×168mm plates to obtain a degradable flame retardant thermal insulation fireproof mat.

[0028] Example 2 Preparation of biodegradable flame retardant thermal insulation mats: S1. Cut 60 sheets of HLGX ceramic fiber paper into a size of 102cm×62cm, place them in a rectangular container, and soak them in a 30% aluminum dihydrogen phosphate solution for 36 hours at 20mpac / m 2 The substrate was squeezed and dehydrated under pressure of 100-120° C. and dried in an oven at 100-120° C. for 30 min to obtain a substrate; S2. Mix 50 parts of silica sol, 50 parts of purified water, and 3 parts of phosphoric acid according to mass percentage to obtain a mixture; S3. Add the mixture into a reactor, stir at 80-100° C. for 120 min, and cool naturally to room temperature to obtain a binder; S4, applying the adhesive to the surface of the substrate, placing it in an oven, and drying it at a temperature of 120-130° C. for 20 minutes to obtain a pretreated plate; S5, pre-treated plate at 100kg / cm 2 Under a strong pressure, it was pressed at a temperature of 240-250°C for 3 hours, then naturally cooled to room temperature, and cut into 200×168mm plates to obtain a degradable flame retardant thermal insulation fireproof mat.

[0029] Example 3 Preparation of polylactic acid modified composites: 7.27 g of ammonium polyphosphate (CAS No.: 14728-39-3) was dispersed in 200 g of deionized water to obtain an ammonium polyphosphate dispersion. 1 g of acetic acid, 100 g of deionized water and 0.91 g of chitosan (CAS No.: 9012-76-4) were mixed and then added to the ammonium polyphosphate dispersion to obtain a mixed solution. The pH of the mixed solution was adjusted to 9 with ammonia water, and then stirred for 2 h. The mixture was centrifuged and washed with deionized water to obtain chitosan polyammonium phosphate. The chitosan polyammonium phosphate was dispersed in 100 g of deionized water. 1.82 g of tannic acid (CAS No.: 1401-55-4) and 100 g of deionized water were added. After stirring, the mixture was centrifuged and washed with deionized water to obtain chitosan polyammonium phosphate. The obtained product was centrifuged and washed with deionized water, and then vacuum-dried in a drying oven at 40°C for 12 h to obtain an ammonium polyphosphate complex; 2.79 g of the ammonium phosphate complex, 34.88 g of polylactic acid (CAS No.: 26023-30-3) and 2.33 g of polybutylene adipate / terephthalate (CAS No.: 55231-08-8) were mixed and added to a screw extruder, and the temperature of the screw zone was set to 185°C. After extrusion, it was pulled to a winder at a winding speed of 250 rpm, and then stretched to three times the length at a temperature of 120°C, and then annealed at a temperature of 200°C under a tension of 10 MPa to obtain a polylactic acid modified composite.

[0030] Preparation of composite fiber felt: The polylactic acid modified composite and the aluminum silicate fiber felt were overlapped at a mass ratio of 1:2, and then punctured with a barb using a needle machine to compound the polylactic acid modified composite and the aluminum silicate fiber felt. The temperature was then raised to 60°C, maintained for 2 hours, and naturally cooled to room temperature to obtain a composite fiber felt.

[0031] Preparation of biodegradable flame retardant thermal insulation mats: S1. Cut 60 sheets of HLGV ceramic fiber paper into a size of 102 cm × 62 cm, place them in a rectangular container, soak them in a 30% aluminum dihydrogen phosphate solution for 36 hours, squeeze and dehydrate them at a pressure of 20 mpac / m2, and dry them in an oven at 100-120°C for 30 minutes to obtain a substrate; S2. Mix 60% silica sol, 40% purified water, and 3% phosphoric acid according to mass percentage to obtain a mixture; S3. Add the mixture into a reactor, stir at 80-100° C. for 120 min, and cool naturally to room temperature to obtain a binder; S4, applying the adhesive to the surface of the substrate, placing it in an oven, and drying it at a temperature of 120-130° C. for 20 minutes to obtain a pretreated plate; S5. Press the pretreated board at a pressure of 100 kg / cm2 and a temperature of 240-250°C for 3 hours, then cool it naturally to room temperature, and cut it into 200×168 mm boards to obtain a degradable flame retardant and heat-insulating fireproof mat.

[0032] Example 4 Preparation of polylactic acid modified composites: 7.69 g of ammonium polyphosphate was dispersed in 200 g of deionized water to obtain an ammonium polyphosphate dispersion, 1 g of acetic acid, 100 g of deionized water and 0.77 g of chitosan were mixed, and then added to the ammonium polyphosphate dispersion to obtain a mixed solution, and the pH of the mixed solution was adjusted to 9 with ammonia water, and then stirred for 2 h, centrifuged, and washed with deionized water to obtain chitosan polyammonium phosphate. Chitosan polyammonium phosphate was dispersed in 100 g of deionized water, 1.54 g of tannic acid and 100 g of deionized water were added, stirred, centrifuged, and washed with deionized water. The mixture was washed with ionized water and then vacuum dried in a drying oven at 40°C for 12 hours to obtain an ammonium polyphosphate complex; 3.22g of the ammonium phosphate complex, 34.48g of polylactic acid and 2.3g of polybutylene adipate / terephthalate were mixed and added to a screw extruder, and the temperature of the screw zone was set to 185°C. After extrusion, it was pulled to a winder at a winding speed of 250rpm, and then stretched to three times the length at a temperature of 120°C, and then annealed at a temperature of 200°C under a tension of 10MPa to obtain a polylactic acid modified composite.

[0033] Preparation of composite fiber felt: The polylactic acid modified composite and silicon HLGX ceramic fiber paper were overlapped at a mass ratio of 1:2, and then punctured with a barb using a needle machine to compound the polylactic acid modified composite and the aluminum silicate fiber felt. The temperature was then raised to 60°C, maintained for 2 hours, and naturally cooled to room temperature to obtain a composite fiber felt.

[0034] Preparation of biodegradable flame retardant thermal insulation mats: S1. Cut 60 sheets of HLGX ceramic fiber paper into a size of 102cm×62cm, place them in a rectangular container, and soak them in a silica sol solution with a mass concentration of 20% for 36 hours at 20mpa / cm 2 The substrate was squeezed and dehydrated under pressure of 100-120° C. and dried in an oven at 100-120° C. for 30 min to obtain a substrate; S2. Mix 50% silica sol, 50% purified water, and 3% phosphoric acid according to mass percentage to obtain a mixture; S3. Add the mixture into a reactor, stir at 80-100° C. for 120 min, and cool naturally to room temperature to obtain a binder; S4, applying the adhesive to the surface of the substrate, placing it in an oven, and drying it at a temperature of 120-130° C. for 20 minutes to obtain a pretreated plate; S5, pre-treated plate at 100kg / cm 2 Under a strong pressure, it is pressed at a temperature of 240-250°C for 3 hours, then naturally cooled to room temperature, and cut into 200×168mm plates to obtain a degradable flame retardant and heat-insulating fireproof mat.

[0035] Example 5 Preparation of polylactic acid modified composites: 7.5 g of ammonium polyphosphate was dispersed in 200 g of deionized water to obtain an ammonium polyphosphate dispersion. 1 g of acetic acid, 100 g of deionized water and 0.83 g of chitosan were mixed and then added to the ammonium polyphosphate dispersion to obtain a mixed solution. Ammonia water was used to adjust the pH of the mixed solution to 9, and then the mixture was stirred for 2 h, centrifuged and washed with deionized water to obtain chitosan polyammonium phosphate. Chitosan polyammonium phosphate was dispersed in 100 g of deionized water, 1.67 g of tannic acid and 100 g of deionized water were added, stirred, centrifuged and washed with deionized water. The mixture was washed with water and then vacuum-dried in a drying oven at 40°C for 12 hours to obtain an ammonium polyphosphate complex; 3.01g of the ammonium phosphate complex, 34.68g of polylactic acid and 2.31g of polybutylene adipate / terephthalate were mixed and added to a screw extruder, and the temperature of the screw zone was set to 185°C. After extrusion, it was pulled to a winder at a winding speed of 250rpm, and then stretched to three times the length at a temperature of 120°C, and then annealed at a temperature of 200°C under a tension of 10MPa to obtain a polylactic acid modified composite.

[0036] Preparation of composite fiber felt: The polylactic acid modified composite and the aluminum silicate fiber felt were overlapped at a mass ratio of 1:2, and then punctured with a barb using a needle machine to compound the polylactic acid modified composite and the aluminum silicate fiber felt. The temperature was then raised to 60°C, maintained for 2 hours, and naturally cooled to room temperature to obtain a composite fiber felt.

[0037] Preparation of biodegradable flame retardant thermal insulation mats: S1. Cut 60 sheets of aluminum silicate fiber felt into a size of 102 cm × 62 cm, place them in a rectangular container, and soak them in a 30% aluminum dihydrogen phosphate solution for 36 hours at 20 MPa / cm 2 The substrate was squeezed and dehydrated under pressure of 100-120° C. and dried in an oven at 100-120° C. for 30 min to obtain a substrate; S2. Mixing 30% silica sol, 70% purified water, and 3% phosphoric acid according to mass percentage to obtain a mixture; S3. Add the mixture into a reactor, stir at 80-100° C. for 120 min, and cool naturally to room temperature to obtain a binder; S4, applying the adhesive to the surface of the substrate, placing it in an oven, and drying it at a temperature of 120-130° C. for 20 minutes to obtain a pretreated plate; S5, pre-treated plate at 100kg / cm 2 Under a strong pressure, it was pressed at a temperature of 240-250°C for 3 hours, then naturally cooled to room temperature, and cut into 200×168mm plates to obtain an aerogel thermal insulation and fireproof mat.

[0038] Example 6 Example 6 is based on Example 5. In Example 6, when preparing the polylactic acid modified composite, the amount of ammonium polyphosphate used is 6.67 g, the amount of chitosan used is 1.11 g, and the amount of tannic acid used is 2.22 g.

[0039] Example 7 Example 7 is based on Example 5. In Example 7, when preparing the polylactic acid modified composite, the amount of ammonium polyphosphate used is 8 g, the amount of chitosan used is 0.67 g, and the amount of tannic acid used is 1.33 g.

[0040] Example 8 Example 8 is based on Example 5. In Example 8, when preparing the polylactic acid modified composite, the amount of ammonium polyphosphate composite used is 2.36 g, the amount of polylactic acid used is 35.29 g, and the amount of polybutylene adipate / terephthalate used is 2.25 g.

[0041] Example 9 Example 9 is based on Example 5. In Example 9, when preparing the polylactic acid modified composite, the amount of ammonium polyphosphate composite used is 3.64 g, the amount of polylactic acid used is 34.09 g, and the amount of polybutylene adipate / terephthalate used is 2.27 g.

[0042] Example 10 Example 10 is based on Example 5. In Example 10, when preparing the polylactic acid modified composite, the polyphosphoric acid composite is replaced with ordinary polyphosphoric acid.

[0043] Performance testing The following performance tests were performed on the samples of Examples 1-10: (1) Based on the flame retardant test standard UL94, the flame retardant performance of the samples was tested. Each sample was tested three times, and the average value was taken. The test results were filled in Table 1.

[0044] (2) Test the thermal conductivity, density, and buffer compression rate of the sample under 3Mpa conditions. Each sample is tested three times, and the average value is taken. The test results are filled in Table 1.

[0045] (3) For thickness of 1.0-3.0mm, the hot surface temperature is 450℃, and the cold surface temperature is tested for 5 minutes; for thickness of 2.0mm and above, the hot surface temperature is 675℃, and the cold surface temperature is tested for 5 minutes.

[0046] (4) Test the long-term working temperature and instantaneous working temperature of the sample. Test each sample three times, remove the average value, and fill in the test results in Table 1.

[0047] Table 1 Performance test results of Examples 1-10 As shown in Table 1, the biodegradable flame retardant and heat insulating fireproof mat prepared in the present application has good flame retardant and heat insulating properties.

[0048] This specific embodiment is merely an explanation of the present application and does not limit the present application. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present application. The technical scope of the present application is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A biodegradable flame retardant heat-insulating fireproof mat, characterized by: Includes the following components: Base material, linker, ammonium phosphate and solvent; The substrate comprises a fiber felt substrate, and the fiber felt comprises HLGX calcium magnesium silicate ceramic fiber paper.

2. The biodegradable flame retardant heat-insulating fireproof mat according to claim 1, characterized in that: The connecting agent is silica sol.

3. The biodegradable flame retardant heat insulating fireproof mat according to claim 1, characterized in that: The solvent is pure water.

4. The biodegradable flame retardant heat insulating fireproof mat according to claim 1, characterized in that: The substrate further comprises a polylactic acid modified compound, and the raw materials of the polylactic acid modified compound comprise an ammonium phosphate compound, polylactic acid and polybutylene adipate / terephthalate.

5. The biodegradable flame retardant heat insulating fireproof mat according to claim 4, characterized in that: The ammonium polyphosphate complex is prepared by the following method: The ammonium polyphosphate is mixed with water to obtain an ammonium polyphosphate dispersion; acetic acid, water and chitosan are mixed and added to the ammonium polyphosphate dispersion to obtain a mixed solution; the mixed solution is stirred and then centrifuged; the mixed solution is washed to obtain chitosan polyammonium phosphate; the chitosan polyammonium phosphate is mixed with water, tannic acid and water are added, the mixed solution is stirred and then centrifuged and washed; and the mixed solution is dried to obtain an ammonium polyphosphate complex.

6. The biodegradable flame retardant heat insulating fireproof mat according to claim 5, characterized in that: The mass ratio of the ammonium polyphosphate, chitosan and tannic acid is (8-10):1:

2.

7. The biodegradable flame retardant heat insulating fireproof mat according to claim 4, characterized in that: The polylactic acid modified composite is prepared by the following method: The polylactic acid and ammonium polyphosphate compound is mixed with polyadipate / butylene terephthalate and then extruded to obtain prefabricated fiber filaments, and the prefabricated fiber filaments are stretched and then annealed to obtain the polylactic acid modified compound.

8. The biodegradable flame retardant heat insulating fireproof mat according to claim 7, characterized in that: The mass ratio of the ammonium polyphosphate composite, polylactic acid and poly(adipate / butylene terephthalate) is (1.2-1.4):15:

1.

9. A method for preparing a biodegradable flame retardant, heat insulating and fireproof mat according to any one of claims 1 to 8, characterized in that: The steps include: S1, filling the substrate with a 20% silica sol solution to obtain a pre-treated substrate; S2. Mix 40% silica sol solution, purified water, and phosphoric acid, add the mixture to a reactor, stir for 120 minutes at 80-100° C., and then cool to room temperature to obtain a binder; S3. Applying the adhesive to the surface of the pre-treated substrate, and then hot pressing to obtain a biodegradable flame retardant heat insulating fireproof mat.

10. The method for preparing a biodegradable flame retardant, heat-insulating and fireproof mat according to claim 9, characterized in that: In step S3, the hot pressing pressure is 90-110 kg / cm 2 , the hot pressing temperature is 240-250℃, and the hot pressing time is 150-180min.

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