Efficient organic-inorganic hybrid bio-based ceramic fireproof coating as well as preparation method and application thereof

Abstract

The invention relates to an efficient organic-inorganic hybrid bio-based ceramic fireproof coating as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing polyethylene glycol modified phytic acid; preparation of melamine diborate; and preparing the polyethylene glycol modified phytic acid / melamine diborate-glass powder-gelatin fireproof flame-retardant coating. According to the invention, polyethylene glycol PEG is selected to modify phytic acid, so that the reactivity of phytic acid is reduced through functional modification, and a suitable product with better subsequent flame retardant property is obtained. The low-activity phosphate group in the polyethylene glycol modified phytic acid can react with the amino group of the melamine diborate to form an ionic bond, the intumescent flame retardant is obtained, the glass powder is added, a ceramic fireproof coating is achieved, and more excellent fireproof performance is embodied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flame-retardant materials, and in particular to a high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating, a preparation method thereof and an application thereof. BACKGROUND

[0002] With the continuous development and progress of flame-retardant technology, in recent years, many new wood flame-retardant methods have appeared, which are mainly divided into three basic treatment methods of wood, namely surface treatment, veneer treatment and deep treatment. The surface treatment method mainly introduces high molecular or monomer substances with flame-retardant effect on the surface of wood by coating, spraying or deposition, and uses physical and chemical methods to crosslink and solidify them, so as to form a heat insulation protective layer on the surface of wood. Common surface treatment methods mainly include surface coating method, deposition method and etching method. In order to solve the problems existing in the above-mentioned traditional wood flame-retardant treatment methods, such as poor compatibility and poor flame-retardant durability, and to alleviate the environmental and energy pressure caused by excessive dependence on petroleum resources, it has far-reaching practical application value to introduce bio-based raw materials into the wood flame-retardant system to prepare bio-based flame-retardant coating.

[0003] Phytic acid (PA) as a high-phosphorus bio-based flame retardant has attracted much attention in recent years. It has a myo-inositol hexakisphosphate structure and a six-carbon ring molecular configuration. Phytic acid is easily soluble in ethanol and water, but hardly soluble in anhydrous diethyl ether, chloroform and benzene, etc. Due to the strong acidity of phytic acid, the gas source in the intumescent flame-retardant system reacts with phytic acid to form a salt, and the composition of the matrix resin is mostly polymer, so the compatibility between the two is very poor. The obtained coating is generally opaque after curing, and the water resistance of the coating is also poor because of the simple mixing between the two.

[0004] Glass powder as a low-temperature sintering aid and ceramic precursor has shown important application potential in the field of functional materials, composite materials and coating technology in recent years. Due to its adjustable softening temperature, chemical stability and compatibility with various matrices, glass powder has become a key material for low-temperature ceramicization. SUMMARY

[0005] The present application aims to provide a high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating, a preparation method thereof and an application thereof. First, different molecular weight polyethylene glycol (PEG) and the like are selected as carbon sources to chemically modify phytic acid, so as to reduce the acidity and reactivity of the phosphoric acid group in phytic acid; then, a suitable gas source (melamine) is introduced into the phytic acid-g-PEG system to prepare a ternary integrated intumescent flame retardant, and then the ternary integrated intumescent flame retardant and glass powder are mixed in a certain proportion to prepare a flame-retardant coating with good stability.

[0006] Specifically, the present application provides the following technical solutions: The application discloses a preparation method of a high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating, and belongs to the technical field of fireproof coatings.

[0007] Specifically, the method comprises the following steps: Step one, boric acid (H3BO3) and melamine (C3N6H6) are mixed according to a molar ratio of 1-2:1 and added into deionized water, and a transparent solution is obtained by stirring at 80 DEG C, then the hot solution is cooled to room temperature (15-25 DEG C) until a white precipitate is obtained; then the white precipitate is heated and dried to obtain white powder melamine borate (MB); Step two, phytic acid PA (C6H 18 O 24 P6) is reacted with polyethylene glycol PEG according to a molar ratio of 1:1-6, nitrogen is filled, and the reaction is carried out in an oil bath to obtain modified phytic acid, i.e., phytic acid-g-PEG; Step three, melamine diborate (MB) is reacted with phytic acid-g-PEG according to a molar ratio of 1-6:1, deionized water is added and stirred to be uniformly mixed, the reaction temperature is 60-80 DEG C, after sufficient reaction, a solution is formed, and the solution is dried in an oven to obtain a solid product, i.e., phytic acid-g-PEG melamine borate intumescent flame retardant, i.e., PgPMB; Step four, PgPMB, glass powder and gelatin are mixed and stirred according to a mass ratio of 0.1-0.5:0.01-0.05:1, deionized water is added, and after sufficient stirring at 60-80 DEG C, the high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating is obtained.

[0008] Further, the melting temperature of the glass powder is 330-350 DEG C.

[0009] Further, in step one, the amount of deionized water is 300-500 mL, and the stirring time is 0.5-2 h.

[0010] Further, in step two, the molecular formula of the polyethylene glycol PEG is HO(CH2CH2O)nH, and Mn is 200-2000; further, the polyethylene glycol PEG is selected from any one of the following molecular weights: 200, 600, 1000 and 2000; the reaction temperature is 135-150 DEG C, and the reaction time is 5-6 h.

[0011] Further, in the step three, the amount of deionized water is 150-200 mL, and the stirring time is 1-2 h.

[0012] Further, in the step three, the oven temperature is 60-90 DEG C, and the drying time is 18-24 h.

[0013] Further, in the step four, the amount of deionized water is 50-100 mL, and the stirring time is 0.5-2 h.

[0014] Further, the coating method in the step four includes brushing, and the coated dry coating mass on the pure wood board is 100-300 g / m 2 .

[0015] The prepared high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating can be used in the fields of flame retardation, fire prevention, heat insulation and the like.

[0016] Further, the polyethylene glycol modified phytic acid / melamine diborate-glass powder-gelatin fireproof and flame-retardant coating provided by the application can effectively prevent oxygen and heat from entering the wood during combustion, maintain the integrity of the wood board, and has remarkable fire-retardant, fireproof and heat-insulating effects and good mechanical properties.

[0017] Compared with the prior art, the application has the following beneficial effects: (1) The method of the application uses polyethylene glycol (PEG) to modify phytic acid, and the functional modification can reduce the reactivity of phytic acid and obtain a product with suitable and better subsequent flame-retardant properties. The low-activity phosphoric acid group in the polyethylene glycol modified phytic acid can react with the amino group of melamine diborate to form an ionic bond to obtain an intumescent flame retardant, and by adding glass powder, a ceramic fireproof coating is realized, which has more excellent fireproof performance.

[0018] (2) The polyethylene glycol modified phytic acid / melamine diborate-glass powder-gelatin fireproof coating prepared by the application has good flame-retardant effect, forms a ceramic surface, and has good compactness, thermal stability and heat insulation capacity. The coating has strong adhesion and is not easy to fall off. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a reaction equation of the intumescent flame retardant.

[0020] Figure 2 It is a thermogravimetric curve (TGA) of the five coating materials of Examples 1-4 and Comparative Example 1.

[0021] Figure 3 It is a SEM photo of the five coating materials of Examples 1-4 and Comparative Example 1.

[0022] Figure 4 The heat release rate (HRR) curves and total heat release (THR) curves of the five coating materials in Examples 1–4 and Comparative Example 1 are shown. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0024] Example 1 A method for preparing a highly efficient organic-inorganic hybrid bio-based ceramic fire-retardant coating, specifically comprising: (1) Weigh 6.2g of boric acid (H3BO3), add 400mL of deionized water and stir to dissolve. Then add 6.3g of melamine (C3N6H6) (the molar ratio of boric acid to melamine is 2:1) and stir at 80℃ for 1h to obtain a transparent solution. Cool to room temperature (15~25℃) to obtain a white precipitate. Vacuum filter, wash, and then place in an oven at 80℃ for 12h to dry to obtain white powdered melamine diborate (MB).

[0025] (2) Weigh 9.43g of phytic acid (C6H) 18 O 24 P6) solution was added to a three-necked flask, and nitrogen gas was introduced into an oil bath at 135°C. After stirring for 1-2 hours, polyethylene glycol (HO(CH2CH2O)) was added. n 6g of phytic acid and polyethylene glycol (molar ratio of phytic acid to polyethylene glycol 1:3) were reacted at 135℃ for 5h to obtain modified phytic acid-g-PEG.

[0026] (3) such as Figure 1 As shown, 5.43g of melamine borate (MB) was weighed and added to a phytic acid-g-PEG solution (molar ratio of MB to phytic acid-g-PEG 3:1). 200ml of deionized water was added and mixed evenly. The mixture was stirred at 80℃ for 1h. After the reaction was complete, the resulting solution was dried in an oven at 120℃ to obtain the solid product, which is the phytic acid-g-PEG melamine diborate intumescent flame retardant (PgPMB).

[0027] (4) Weigh 8g of gelatin and 2g of PgPMB and add them to 50mL of deionized water. Stir in an oil bath at 80℃ for 0.5h. After stirring thoroughly, apply the mixture to a pure wood board (W1) according to the standard of 200g per square meter after drying.

[0028] Example 2 A method for preparing a highly efficient organic-inorganic hybrid bio-based ceramic fire-retardant coating, specifically comprising: (1) Weigh 6.2g of boric acid, add 400mL of deionized water and stir to dissolve. Then add 6.3g of melamine (the molar ratio of boric acid to melamine is 2:1) and stir at 80℃ for 1h to obtain a transparent solution. Cool to room temperature (15~25℃) to obtain a white precipitate. Vacuum filter, wash, and then place in an oven at 80℃ for 12h to dry to obtain white powdered melamine diborate (MB).

[0029] (2) Weigh 9.43g of phytic acid (C6H) 18 O 24 P6) solution was added to a three-necked flask, and nitrogen gas was introduced into an oil bath at 135°C. After stirring for 1-2 hours, polyethylene glycol (HO(CH2CH2O)) was added. n 6g of phytic acid (H, Mn 200) (molar ratio of phytic acid to polyethylene glycol 1:3) was reacted at 135℃ for 5h to obtain modified phytic acid (phytic acid-g-PEG).

[0030] (3) such as Figure 1 As shown, 5.43g of melamine borate (MB) was weighed and added to a phytic acid-g-PEG solution (molar ratio of MB to phytic acid-g-PEG 3:1). 200ml of deionized water was added and mixed evenly. The mixture was stirred at 80℃ for 1h. After the reaction was complete, the resulting solution was dried in an oven at 120℃ to obtain the solid product, which is the phytic acid-g-PEG melamine diborate intumescent flame retardant (PgPMB).

[0031] (4) Weigh 8g of gelatin, 1.90g of PgPMB and 0.10g of glass powder and add them to 50mL of deionized water. Stir at 80℃ for 0.5h. After stirring thoroughly, apply the mixture to the wooden board (W2) according to the standard of 200g per square meter after drying.

[0032] Example 3 A method for preparing a highly efficient organic-inorganic hybrid bio-based ceramic fire-retardant coating, specifically comprising: (1) Weigh 6.2g of boric acid, add 400mL of deionized water and stir to dissolve. Then add 6.3g of melamine (the molar ratio of boric acid to melamine is 2:1) and stir at 80℃ for 1h to obtain a transparent solution. Cool to room temperature (15~25℃) to obtain a white precipitate. Vacuum filter, wash, and then place in an oven at 80℃ for 12h to dry to obtain white powdered melamine diborate (MB).

[0033] (2) Weigh 9.43g of phytic acid solution and add it to a three-necked flask. In an oil bath at 135℃, purge with nitrogen and stir for 1-2 hours. Then add polyethylene glycol (HO(CH2CH2O)). n 6g of phytic acid (H, Mn 200) (molar ratio of phytic acid to polyethylene glycol 1:3) was reacted at 135℃ for 5h to obtain modified phytic acid (phytic acid-g-PEG).

[0034] (3) such as Figure 1 As shown, 5.43g of melamine borate was weighed and added to a phytic acid-g-PEG solution (molar ratio of MB to phytic acid-g-PEG 3:1), 200ml of deionized water was added and mixed evenly. The mixture was stirred at 80℃ for 1h until the reaction was complete and a solution was formed. The solution was then dried in an oven at 120℃ to obtain a solid product, which is the phytic acid-g-PEG melamine diborate intumescent flame retardant (PgPMB).

[0035] (4) Weigh 8g of gelatin, 1.80g of PgPMB and 0.20g of glass powder and add them to 50mL of deionized water. Stir at 80℃ for 1h. After stirring thoroughly, apply the mixture to the wooden board (W3) according to the standard of 200g per square meter after drying.

[0036] Example 4 A method for preparing a highly efficient organic-inorganic hybrid bio-based ceramic fire-retardant coating, specifically comprising: (1) Weigh 6.2g of boric acid, add 400mL of deionized water and stir to dissolve. Then add 6.3g of melamine (the molar ratio of boric acid to melamine is 2:1) and stir at 80℃ for 1h to obtain a transparent solution. Cool to room temperature (15~25℃) to obtain a white precipitate. Vacuum filter, wash, and then place in an oven at 80℃ for 12h to dry to obtain white powdered melamine diborate (MB).

[0037] (2) Weigh 9.43g of phytic acid solution and add it to a three-necked flask. In an oil bath at 135℃, purge with nitrogen and stir for 1-2 hours. Then add polyethylene glycol (HO(CH2CH2O)). n 6g of phytic acid (H, Mn 200) (molar ratio of phytic acid to polyethylene glycol 1:3) was reacted at 135℃ for 5h to obtain modified phytic acid (phytic acid-g-PEG).

[0038] (3) such as Figure 1As shown, 5.43 g of melamine borate was weighed and added to the phytic acid-g-PEG solution (molar ratio of MB to phytic acid-g-PEG 3:1), 200 ml of deionized water was added and mixed uniformly, and stirring was performed at 80°C for 1 h. After the reaction was fully carried out, a solution was formed, and the solution was placed in an oven at 120°C for drying, to obtain a solid product, i.e. phytic acid-g-PEG melamine diborate intumescent flame retardant (PgPMB).

[0039] (4) 8 g of gelatin, 1.70 g of PgPMB and 0.30 g of glass powder were weighed and added to 50 mL of deionized water, and stirring was performed at 80°C for 1 h. After sufficient stirring, the mixture was applied to a wood board (W4) according to a standard of 200 g per square meter after drying.

[0040] In order to highlight the beneficial effects of the present application, the following comparative examples are exemplified.

[0041] Comparative Example 1 A certain amount of gelatin was weighed and added to a certain amount of deionized water, and stirring was performed at 80°C. After sufficient stirring, the mixture was applied to a wood board.

[0042] 10 g of gelatin was weighed and added to 50 mL of deionized water, and stirring was performed at 80°C. After sufficient stirring, the mixture was applied to a wood board (W5) according to a standard of 200 g per square meter after drying.

[0043] The following are performance test experiments of Examples 1-4 and Comparative Example 1.

[0044] (1) The flame retardant performance of the wood board with a coating prepared in Examples 1-4 was determined. Limiting oxygen index (LOI) test: LOI was tested according to GB / T 2406.2-2009 standard on an HC-2 type oxygen index instrument, and the sample size was 100×6.5×3 mm 3 . According to GB / T 2408-2021 standard, the sample size was 100×13×3 mm 3 on a CZF-3 type horizontal and vertical combustion tester. The specific determination results are shown in Table 1.

[0045] Table 1 From the data in the above table, it can be seen that the LOI of Comparative Example 1 is the lowest at 24%; Example 1 has already improved the LOI to 31%, meeting the basic requirements of flame-retardant coating; the LOI of Example 2 slightly decreases to 30.5%, possibly because the filler dilutes the concentration of the active flame-retardant component; the LOI of Example 3 increases to 32.0%, the highest value among all samples, indicating that the synergistic effect of the glass powder and the flame retardant is optimal at this time; the LOI of Example 4 decreases to 29.5%, indicating that the excessive filler begins to weaken the activity of the flame retardant or destroy the continuity of the coating. Comparative Example 1 does not have practical flame retardancy, and Examples 1-3 all reach V0 level, and Example 4 reaches V1 level.

[0046] (2) Thermogravimetric analysis (TGA): The thermal stability of the material was tested using a TGA-Q5000 type thermal analyzer. The results are shown in Figure 2

[0047] As can be seen from Figure 2 , the thermogravimetric curves (TGA) of the five coating materials of Examples 1-4 and Comparative Example 1 under nitrogen atmosphere (heating rate 20 ℃ / min).

[0048] 200-300℃, each sample has an obvious weight loss peak of 10-15 wt%, this stage is accompanied by both the desorption of residual free water and the breaking of a small amount of hydrogen bonds. This phenomenon is common in hydrophilic polymer systems such as gelatin. Compared with Comparative Example 1, the weight loss of Examples 1-4 is slightly slower, indicating that the flame retardant or filler begins to play a certain heat insulation or chemical crosslinking role.

[0049] 300-500℃, Comparative Example 1: the weight loss is the most severe, and the mass decreases rapidly, mainly due to the dehydration of hydroxyl groups to form carbon skeleton (-OH, C=C / C-O-C) and the breaking of peptide bond / C-N main chain; Example 1: the initial decomposition temperature is about 20-30℃ higher than that of Comparative Example 1, and the weight loss rate is significantly slower, indicating that the flame retardant promotes the formation of the initial carbon layer and provides partial heat insulation protection. Example 2: the initial decomposition temperature is further delayed, and the weight loss is about 10% (relative) lower than that of Example 1, indicating that a small amount of glass powder begins to form a molten "shielding film" at high temperature, sealing part of the micropores; Example 3: the weight loss in this stage is the lightest, and the carbonization starts later and at a lower rate, proving that the synergy of glass powder and flame retardant is the most effective at this time - the glass powder interweaves with the carbon layer after melting to form a continuous "ceramic-carbon" skeleton, preventing heat / mass transfer; Example 4: the initial decomposition temperature is similar to that of Example 3, but a small amount of accelerated weight loss occurs in the 350-450℃ interval, possibly because the excessive glass powder is prone to particle agglomeration, leading to local stress concentration and micro-cracks in the carbon layer, thereby slightly weakening the heat insulation effect.

[0050] ​At 700 °C, the carbon residue rate of Comparative Example 1 was the lowest at 31%, and Example 1 increased by 6 percentage points to 37%, indicating that the flame retardant itself had a certain carbonization catalytic ability; Examples 2 and 3 had a carbon residue rate of 39% and 46% respectively in the range of 5-10 wt% of glass powder, with a particularly significant increase; Example 4 was still higher than Examples 1 and 2, reaching 42%, but was slightly lower than Example 3.

[0051] (3) Scanning Electron Microscope (SEM): SEM was observed using a ZEISS Gemini SEM500 (Zeiss) model. The results are shown in Figure 3 .

[0052] As can be seen from Figure 3 , the surface of the carbon layer of Example 1 was rough, with a reticular "sponge" structure, small and numerous holes, and obvious interconnection; the morphological characteristics of Example 2: local smooth flaky areas appeared on the surface of the carbon layer, and a "film" was formed on the edge of the hole after the glass powder melted, and the number of pores was less than that of Example 1. The morphological characteristics of Example 3: the carbon surface had almost no obvious large pores, and had a dense continuous structure of layers or corrugations, and the glass network was tightly combined with the carbon base. The morphological characteristics of Example 4: a large number of micron-sized circular particles (aggregated glass powder) and a small amount of cracks / pores were visible on the surface, and the carbon layer was not continuous. The morphological characteristics of Comparative Example 1: typical honeycomb structure with large pores, a large number of bubble-shaped holes, thin walls and large pore size.

[0053] (4) Cone calorimeter test: The cone calorimeter (Suzhou Yangyi Walci Detection Technology Co., Ltd.) test was carried out according to the ISO 5600 standard test method. The size of the sample was 100 x 100 x 3 mm 3 . The radiant heat flux used during the test was 35 kW / m 2 . The results are shown in Figure 4 .

[0054] Combining the heat release rate (HRR) curves of the five samples in the left graph, Comparative Example 1 showed the highest peak heat release rate PHRR of 247 kW / m 2 , and rapidly decayed after reaching the peak. The maximum heat release per unit area during the entire combustion stage, and the poorest flame retardant performance. The PHRR of Example 1 was 138 kW / m 2 , which was about 44% lower than that of Comparative Example 1, and was significantly delayed to a longer combustion time. The PHRR of Example 2 was 110 kW / m 2 , which was about 56% lower than that of Comparative Example 1, indicating that a small amount of glass powder could dilute the combustible components and form a preliminary support for the carbon layer. The PHRR of Example 3 was 88 kW / m 2, which is about 64% lower than that of Comparative Example 1, the lowest among all systems, indicating that the compact carbon / ceramic skeleton generated by the synergistic effect of the glass powder and the flame retardant is the most perfect. The PHRR of Example 4 is 149 kW / m 2 , which is higher than that of Example 1, and significantly rebounds compared with Example 3. This indicates that when the content of glass powder is too high, powder aggregation and insufficient interfacial bonding are prone to occur, resulting in early cracking of the carbon layer, thereby reducing the barrier effect. With the increase of the content of glass powder from 0 to 10 wt%, the PHRR first decreases significantly; when the content exceeds 10 wt%, the PHRR begins to rebound. This "first decrease and then increase" trend reflects the dual role of glass powder: the dilution and inert filler effect can reduce the heat release per unit mass of combustible components; the "ceramic skeleton" - carbon layer composite structure formed by melting can enhance the mechanical strength and closed porosity of the carbonized layer; but when the filler is too much, powder aggregation and matrix-filler interfacial stress concentration will cause carbon layer cracks and reduce the overall heat barrier performance. In the right graph, the total heat release (THR) curves of the five samples, the final THR of Comparative Example 1 is 28 MJ / m 2 , the highest among the five samples. The THR of Example 1 is 18 MJ / m 2 ; the THR of Example 2 is 14 MJ / m 2 , about 50% lower than that of Comparative Example 1; the THR of Example 3 is 15 MJ / m 2 ; the THR of Example 4 is 23 MJ / m 2 . With the content of glass powder increasing from 0 to 10 wt%, the THR continuously decreases, indicating that the flame-retardant coating can generate a more compact and closed carbon layer barrier during the combustion process, significantly slowing down the heat transfer to the substrate; when the content of glass powder further increases to 15 wt%, the THR rebounds, reflecting the negative impact of excessive filler on the integrity of the carbon layer.

[0055] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made in accordance with the technical essence of the present application, without departing from the technical solution of the present application, are still within the scope of the technical solution of the present application.

Claims

1. A method for the preparation of a highly efficient organic-inorganic hybrid bio-based ceramicized fire-retardant coating, characterized by: The organic-inorganic hybrid bio-based ceramic fireproof coating is a polyethylene glycol modified phytic acid / melamine diborate-glass powder-gelatin fireproof coating, and a preparation method thereof comprises the following steps: Step one, boric acid and melamine are mixed according to a molar ratio of 1-2:1 and added into deionized water, and a transparent solution is obtained by stirring at 80 DEG C, and then the hot solution is cooled to room temperature until a white precipitate is obtained; then the white precipitate is heated and dried to obtain white powder melamine borate; Step two, phytic acid PA and polyethylene glycol PEG are reacted according to a molar ratio of 1:1-6, nitrogen is filled, and the reaction is carried out in an oil bath to obtain modified phytic acid, i.e., phytic acid-g-PEG; Step three, melamine diborate and phytic acid-g-PEG are reacted according to a molar ratio of 1-6:1, deionized water is added and stirred to mix uniformly, the reaction temperature is 60-80 DEG C, and after the reaction is sufficiently carried out, a solution is formed, and the solution is placed in an oven for drying to obtain a solid product, i.e., phytic acid-g-PEG melamine borate intumescent flame retardant, i.e., PgPMB; Step four, PgPMB, glass powder and gelatin are mixed and stirred according to a mass ratio of 0.1-0.5:0.01-0.05:1, deionized water is added, and after being sufficiently stirred at 60-80 DEG C, a high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating is obtained.

2. The process for the preparation of efficient organic-inorganic hybrid bio-based ceramic fireproof coating according to claim 1, characterized by the fact that: The melting temperature of the glass powder is 330-350 DEG C.

3. The method of preparation of efficient organic-inorganic hybrid bio-based ceramic fireproof coating according to claim 1, characterized in that: In step one, the amount of deionized water added is 300-500 mL, and the stirring time is 0.5-2 h.

4. The method of claim 1, wherein the method is characterized by: In step two, the molecular formula of polyethylene glycol PEG is HO(CH2CH2O)nH, Mn is 200-2000, the reaction temperature is 135-150 DEG C, and the reaction time is 5-6 h.

5. The method of preparing efficient organic-inorganic hybrid bio-based ceramicized fireproof coating according to claim 1, characterized in that: In step three, the amount of deionized water added is 150-200 mL, and the stirring time is 1-2 h.

6. The method of claim 1, wherein the method is characterized by: In step three, the oven temperature is 60-90 DEG C, and the drying time is 18-24 h.

7. The method of claim 1, wherein the method is characterized by: In step four, the amount of deionized water added is 50-100 mL, and the stirring time is 0.5-2 h.

8. The method of claim 1, wherein the method is characterized by: The coating method in the fourth step includes brushing method, and the coating quality on the pure wood board is 100-300g / m 2 .

9. The high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating obtained by the preparation method in any one of claims 1-8.

10. The application of the high-efficiency organic-inorganic hybrid bio-based ceramic fireproof coating in claim 9 in flame retardation, fire prevention and heat insulation.

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