Polyurethane foaming composition and preparation process thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyurethane foaming composition and a preparation process. The polyurethane foaming composition is prepared from the following raw materials in parts by mass: 8 to 20 parts of aromatic isocyanate, 25 to 40 parts of plant-based polyol, 8 to 20 parts of polycarbonate diol, 5 to 8 parts of a main flame retardant, 1 to 2 parts of an auxiliary flame retardant, 0.3 to 2 parts of a catalyst, 0.5 to 1 part of a foam stabilizer and 0.3 to 0.5 part of water, wherein the main flame retardant is modified magadiite, and the modified magadiite is prepared by modifying the magadiite through Sn / TiO2 and chitosan; according to the polyurethane foaming composition, the addition amount of the main flame retardant modified magadiite and the auxiliary flame retardant is small, and through reasonable and scientific matching, the polyurethane foaming composition has excellent flame retardant performance and good mechanical performance at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a polyurethane foaming composition and a preparation process. Background Art

[0002] Polyurethane refers to a polymer compound containing repeating structural units of carbamate (-NHCOO-) in the main polymer chain. The products can be widely used as foams, rubbers, synthetic leathers, coatings, etc. Polyurethane foams are commonly used as cushioning materials, thermal insulation materials, packaging materials, building materials, etc. due to their excellent thermal insulation performance, good mechanical strength and other advantages. Many of these applications require high flame retardancy of polyurethane foams; correspondingly, methods for imparting flame retardancy to polyurethane foams have been developed, and adding flame retardants is a common method for preparing flame-retardant polyurethane foams. Commonly used flame retardants are halogen-containing and phosphorus-containing compounds.

[0003] The Chinese patent application document with the publication number CN110799563A discloses a flame-retardant polyurethane foam, which is composed of or formed from a component containing at least one isocyanate-reactive sulfur-containing compound and at least one isocyanate-reactive brominated flame retardant. The prepared polyurethane foam has excellent flame retardancy; however, halogen-containing flame retardants, especially brominated flame retardants, are not ideal, with a large amount of smoke and high toxicity during combustion.

[0004] The Chinese patent application document with the publication number CN104892889A discloses a rigid flame-retardant polyurethane foam. The flame retardant used in this patent is a compound composition of an organophosphorus flame retardant and an inorganic flame retardant, and the amount of the flame retardant accounts for 25wt%-45wt% of the total weight of the composition. A polyurethane foam with better flame retardancy is prepared through reasonable proportioning of each component, while reducing the emission of toxic flue gas; however, when the content of the organophosphorus flame retardant is too high, it is easy to reduce the mechanical properties of the polyurethane foam material and shorten the service life of the material. Summary of the Invention

[0005] In the existing polyurethane foams, the flame retardancy and mechanical properties cannot be well balanced; to solve this problem, the present invention provides a polyurethane foaming composition and a preparation process.

[0006] To achieve the object of the present invention, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a polyurethane foaming composition, which is prepared from the following raw materials in parts by mass: 8-20 parts of aromatic isocyanate, 25-40 parts of plant-based polyol, 8-20 parts of polycarbonate diol, 5-8 parts of main flame retardant, 1-2 parts of secondary flame retardant, 0.3-2 parts of catalyst, 0.5-1 part of foam stabilizer, 0.3-0.5 part of water; Wherein, the main flame retardant is modified magadiite; the modified magadiite is prepared by modifying magadiite with Sn / TiO2 and chitosan.

[0007] Preferably, the preparation method of the modified magadiite is as follows: (1) Tetrabutyl titanate and anhydrous ethanol are mixed uniformly to obtain solution A; glacial acetic acid, tin dichloride, concentrated nitric acid, anhydrous ethanol and water are mixed uniformly to obtain solution B; solution B is added to solution A, and the mixture is stirred continuously, and then magadiite is added, stirred sufficiently, aged at room temperature, dried and calcined to obtain Sn / TiO2-magadiite; (2) Dissolve chitosan in an acetic acid aqueous solution, add Sn / TiO2-magadiite, stir, filter, and dry to obtain modified magadiite.

[0008] Preferably, in (1), the mass ratio of tetrabutyl titanate to tin dichloride is (72-78):1; the mass ratio of tetrabutyl titanate to magadiite is (4-6):1; the continuous stirring time is 1-1.5 hours, and the sufficient stirring time is 3-4 hours.

[0009] Preferably, in (1), the drying temperature is 80-85°C, and the drying time is 9-12 hours; the calcination temperature is 400-500°C, and the calcination time is 2-3 hours.

[0010] Preferably, in (2), the mass ratio of chitosan to Sn / TiO2-magadiite is (4-6):1.

[0011] Preferably, the preparation method of the plant-based polyol is as follows: Crush 4-5 parts of peels, add 18-21 parts of liquefier and 1 part of concentrated sulfuric acid, stir and heat to react, cool to room temperature, adjust pH to 7-8, and obtain plant-based polyols.

[0012] Preferably, the reaction temperature is 110-130° C., the reaction time is 1-2 h, and the pH is 7-8.

[0013] Preferably, the liquefier is a mixed liquefier of polyol and ethylene carbonate, and the polyol is selected from one or more of polyethylene glycol, diethylene glycol, propylene glycol, and glycerol.

[0014] Preferably, the aromatic isocyanate is diphenylmethane diisocyanate or toluene diisocyanate; the secondary flame retardant is [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid; and the catalyst is pentamethyldiethylenetriamine and dimethylethanolamine prepared in a mass ratio of (2-3):1.

[0015] In a second aspect, the present invention provides a preparation process for the above polyurethane foaming composition, comprising the following steps: Mix the plant-based polyol, polycarbonate diol, main flame retardant, secondary flame retardant, catalyst, foam stabilizer, and water evenly, then add the aromatic isocyanate, stir well, pour into a mold for foaming, curing, and demolding to obtain the polyurethane foaming composition.

[0016] The foam stabilizer used in the present invention is a commonly used foam stabilizer in polyurethane foams, such as silicone oil AK-158, silicone oil AK-8805, silicone oil AK-8806, etc.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The modified magadiite prepared by the present invention can effectively improve the fire resistance and thermal insulation ability of the polyurethane foaming composition by increasing the interlayer pore size, enhancing the heat insulation performance, and optimizing the flame retardant effect. First, Sn / TiO2 will absorb a large amount of heat during combustion, reduce the temperature around the combustion area, and slow down the spread rate of the fire. At the same time, TiO2 itself will also pyrolyze at high temperature to generate oxides, which have an endothermic effect on the flame and further inhibit combustion. Second, the layered structure of magadiite itself will expand during combustion, forming a gas and soot layer with heat insulation and flame retardant effects, hindering the entry of oxygen and heat, and slowing down the combustion rate of the flame. Through the modification of Sn / TiO2, the interlayer pore structure becomes larger, which helps to better promote this expansion effect, thereby blocking the propagation of the flame, reducing the combustion rate and the thermal radiation of the flame. (2) Chitosan in the modified magadiite of the present invention can chemically react with the surface of magadiite, improving the heat resistance and thermal stability of magadiite, thereby enhancing its long-term stability in the polyurethane foaming composition. At the same time, chitosan, as a natural polysaccharide, has good biocompatibility and flexibility. As a carrier of magadiite, it can improve its dispersibility and stability in the polyurethane foaming composition, thereby improving the mechanical properties and durability of the polyurethane foaming composition. (3) Fruit peels such as pomelo peels contain abundant cellulose and polysaccharides, which can be converted into polyols containing hydroxyl groups through a liquefaction reaction, replacing petroleum-based polyols for the preparation of the polyurethane foaming composition, reducing the use of petroleum-based polyols, lowering the production cost of the polyurethane foaming composition, and being environmentally friendly. (4) The main flame retardant modified magadiite and the secondary flame retardant of the polyurethane foaming composition of the present invention are added in small amounts. Through a reasonable and scientific ratio, the polyurethane foaming composition has excellent flame retardant performance while having good mechanical properties. Description of the Drawings

[0018] Figure 1 It is the SEM image of the polyurethane foaming composition of the present invention; Figure 2 SEM image of tobermorite of the present invention; Figure 3 SEM image of modified tobermorite of the present invention. Detailed implementation manners

[0019] The technical solutions of the present invention will be elaborated in detail below with reference to several representative implementation manners of the present invention.

[0020] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. Unless otherwise specified, the materials, reagents, etc. used in the following examples can all be obtained from commercial channels.

[0021] Example 1 A polyurethane foaming composition of this example is prepared from raw materials with the following masses: 1.2 kg of diphenylmethane diisocyanate, 2.5 kg of plant-based polyol, 1 kg of polycarbonate diol, 0.6 kg of modified tobermorite, 0.12 kg of [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, 0.075 kg of pentamethyldiethylenetriamine, 0.025 kg of dimethylethanolamine, 0.08 kg of silicone oil AK-158, 0.03 kg of water.

[0022] The specific steps of the preparation process of the polyurethane foaming composition of this example are as follows: Stir the plant-based polyol, polycarbonate diol, modified tobermorite, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158, and water evenly, then add diphenylmethane diisocyanate, stir for 10 s, pour into a mold for foaming, demold after 40 min, place in a vacuum oven for curing at 60 °C for 24 h, and demold to obtain the polyurethane foaming composition.

[0023] Figure 1 is the SEM image of the polyurethane foaming composition, which is Figure 1 It can be seen that the cell pores are approximately ellipsoidal and the cell pore sizes are relatively uniform.

[0024] The specific steps of the preparation method of the modified tobermorite of this example are as follows: (1) Mix 72.92 g of tetrabutyl titanate with 300 g of absolute ethanol to obtain solution A; mix 0.2 g of glacial acetic acid, 0.99 g of stannous chloride, 10 g of 65% concentrated nitric acid, 50 g of absolute ethanol, and 4.5 g of water evenly to obtain solution B; add solution B to solution A, stir continuously for 1.5 h, then add 18.23 g of tobermorite, stir fully for 3 h, age at room temperature for 24 h, dry at 80 °C for 10 h, and calcine at 400 °C for 2 h to obtain Sn / TiO2-tobermorite; (2) Dissolve 12 g of chitosan in 300 g of 4% acetic acid aqueous solution, add 2 g of Sn / TiO₂ - tobermorite, stir, filter, and dry to obtain modified tobermorite.

[0025] Figure 2 This is the SEM image of the tobermorite of the present invention. Figure 3 This is the SEM image of the modified tobermorite of the present invention. Figure 2 In the tobermorite, a relatively uniform flaky layer structure in the shape of a rose flower is presented, and the surface of the framework is smooth. Figure 3 In the modified tobermorite, the layer spacing becomes larger, the surface of the flakes becomes rough, and the rose flower-shaped structure is destroyed and no longer presents a closely packed state.

[0026] The specific steps of the preparation method of the plant-based polyol in this example are as follows: Crush 40 g of pomelo peel, add 108 g of polyethylene glycol, 72 g of ethylene carbonate, and 10 g of concentrated sulfuric acid with a mass fraction of 98%, stir and heat up to 110 °C for reaction for 1.5 h. After cooling to room temperature, adjust the pH to 8, stir for 1 h, filter to obtain the plant-based polyol.

[0027] Example 2 A polyurethane foam composition in this example is prepared from raw materials with the following masses: 1.5 kg of toluene diisocyanate, 3.5 kg of plant-based polyol, 2 kg of polycarbonate diol, 0.5 kg of modified tobermorite, 0.1 kg of [(2-hydroxyethyl)imino]bis(methylene)diphosphonic acid, 0.02 kg of pentamethyldiethylenetriamine, 0.01 kg of dimethylethanolamine, 0.1 kg of silicone oil AK-158, 0.035 kg of water.

[0028] The specific steps of the preparation process of the polyurethane foam composition in this example are as follows: Stir the plant-based polyol, polycarbonate diol, modified tobermorite, [(2-hydroxyethyl)imino]bis(methylene)diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158, and water evenly, then add toluene diisocyanate, stir for 10 s, pour into a mold for foaming, demold after 40 min, put into a vacuum oven for curing at 60 °C for 24 h, and demold to obtain the polyurethane foam composition.

[0029] The specific steps of the preparation method of the modified tobermorite in this example are as follows: (1) 109.38 g of tetrabutyl titanate was mixed evenly with 300 g of absolute ethanol to obtain solution A; 0.2 g of glacial acetic acid, 1.44 g of stannous chloride, 10 g of 65% concentrated nitric acid, 50 g of absolute ethanol, and 5 g of water were mixed evenly to obtain solution B; solution B was added to solution A, stirred continuously for 1 h, then 18.23 g of magadiite was added, stirred thoroughly for 3.5 h, aged at room temperature for 24 h, dried at 82 °C for 12 h, and calcined at 450 °C for 2.5 h to obtain Sn / TiO₂-magadiite; (2) 9 g of chitosan was dissolved in 300 g of 4% aqueous acetic acid solution, 2 g of Sn / TiO₂-magadiite was added, stirred, filtered, and dried to obtain modified magadiite.

[0030] The specific steps for the preparation method of the plant-based polyol in this example are as follows: 50 g of pomelo peel was crushed, 70 g of propylene glycol, 70 g of diethylene glycol, 70 g of ethylene carbonate, and 10 g of 98% sulfuric acid by mass were added, stirred and heated to 115 °C for reaction for 1 h. After cooling to room temperature, the pH was adjusted to 7, stirred for 1 h, and filtered to obtain the plant-based polyol.

[0031] Example 3 A polyurethane foam composition in this example was prepared from the following raw materials by mass: Diphenylmethane diisocyanate 0.8 kg, plant-based polyol 4 kg, polycarbonate diol 0.8 kg, modified magadiite 0.7 kg, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid 0.15 kg, pentamethyldiethylenetriamine 0.15 kg, dimethylethanolamine 0.05 kg, silicone oil AK-158 0.05 kg, water 0.05 kg.

[0032] The specific steps for the preparation process of the polyurethane foam composition in this example are as follows: The plant-based polyol, polycarbonate diol, modified magadiite, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158, and water were stirred evenly, then diphenylmethane diisocyanate was added, stirred for 10 s, poured into a mold for foaming, demolded after 40 min, placed in a vacuum oven for curing at 60 °C for 24 h, and demolded to obtain the polyurethane foam composition.

[0033] The specific steps for the preparation method of the modified magadiite in this example are as follows: (1) 91.15 g of tetrabutyl titanate was mixed evenly with 300 g of absolute ethanol to obtain solution A; 0.2 g of glacial acetic acid, 1.27 g of stannous chloride, 10 g of 65% concentrated nitric acid, 50 g of absolute ethanol, and 5 g of water were mixed evenly to obtain solution B; solution B was added to solution A, stirred continuously for 1.5 h, then 18.23 g of magadiite was added, stirred thoroughly for 3 h, aged at room temperature for 24 h, dried at 85 °C for 9 h, and calcined at 500 °C for 2 h to obtain Sn / TiO₂-magadiite; (2) 10 g of chitosan was dissolved in 300 g of 4% acetic acid aqueous solution, 2 g of Sn / TiO₂-magadiite was added, stirred, filtered, and dried to obtain modified magadiite.

[0034] The specific steps of the preparation method of the plant-based polyol in this example are as follows: 45 g of pomelo peel was crushed, 120 g of glycerol, 80 g of ethylene carbonate, and 10 g of 98% sulfuric acid by mass were added, stirred and heated to 130 °C for reaction for 2 h, cooled to room temperature, adjusted the pH to 7, filtered to obtain the plant-based polyol.

[0035] Example 4 A polyurethane foam composition in this example was prepared from the following raw materials by mass: 2 kg of toluene diisocyanate, 3 kg of plant-based polyol, 1.6 kg of polycarbonate diol, 0.8 kg of modified magadiite, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid 0.2 kg, pentamethyldiethylenetriamine 0.1 kg, dimethylethanolamine 0.05 kg, silicone oil AK-158 0.07 kg, water 0.04 kg.

[0036] The specific steps of the preparation process of the polyurethane foam composition in this example are as follows: The plant-based polyol, polycarbonate diol, modified magadiite, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158, and water were stirred evenly, then toluene diisocyanate was added, stirred for 10 s, poured into a mold for foaming, demolded after 40 min, placed in a vacuum oven for curing at 60 °C for 24 h, and demolded to obtain the polyurethane foam composition.

[0037] The specific steps of the preparation method of the modified magadiite in this example are as follows: (1) 82.04 g of tetrabutyl titanate was mixed evenly with 300 g of absolute ethanol to obtain solution A; 0.2 g of glacial acetic acid, 4.05 g of stannous chloride, 10 g of 65% concentrated nitric acid, 50 g of absolute ethanol, and 4.5 g of water were mixed evenly to obtain solution B; solution B was added to solution A, stirred continuously for 1 h, then 18.23 g of magadiite was added, stirred thoroughly for 4 h, aged at room temperature for 24 h, dried at 85 °C for 10 h, and calcined at 400 °C for 3 h to obtain Sn / TiO₂-magadiite; (2) 8 g of chitosan was dissolved in 300 g of 4% aqueous acetic acid solution, 2 g of Sn / TiO₂-magadiite was added, stirred, filtered, and dried to obtain modified magadiite.

[0038] The specific steps of the preparation method of the plant-based polyol in this example are as follows: 40 g of pomelo peel was crushed, 120 g of propylene glycol, 60 g of ethylene carbonate, and 10 g of 98% sulfuric acid by mass fraction were added, stirred and heated to 120 °C for reaction for 1 h, cooled to room temperature, adjusted the pH to 8, and filtered to obtain the plant-based polyol.

[0039] Performance testing The polyurethane foam compositions obtained in Examples 1 - 4 were subjected to relevant tests, as shown in Table 1 specifically.

[0040] Density: GB / T 6343 - 2009 "Determination of Apparent Density of Cellular Plastics and Rubbers"; Compressive strength: GB / T 8813 - 2008 "Determination of Compressive Properties of Rigid Cellular Plastics"; Dimensional stability: GB / T 8811 - 2008 "Test Method for Dimensional Stability of Rigid Cellular Plastics under Compression"; Thermal conductivity: GB / T 3399 - 1982 "Test Method for Thermal Conductivity of Plastics - Guarded Hot Plate Method"; Oxygen index: GB / T 2406.2 - 2009 "Plastics - Determination of Burning Behaviour by the Oxygen Index - Part 2: Ambient Temperature Tests".

[0041] Table 1 Test results

[0042] Comparative example 1 A polyurethane foam composition in this comparative example, different from Example 4, in this comparative example, the effect of modified magadiite on the performance of the polyurethane foam composition was investigated, as shown in Table 2 specifically, and the remaining formulations and preparation methods were the same as those in Example 4.

[0043] Table 2 Test results

[0044] As can be seen from Table 1, the addition of magadiite helps to improve the mechanical properties of the polyurethane foam composition. The addition of magadiite increases the density of the polyurethane foam composition. Magadiite bears the load, improves the pressure resistance of the bubble body, and increases the compression strength. After being modified with chitosan and Sn / TiO2, the mechanical properties and flame retardancy of the polyurethane foam composition are significantly improved. With the increase in the dosage of modified magadiite, the density, compression strength, flame retardancy, etc. of the polyurethane foam composition also increase. When the addition amount of modified magadiite is too much, agglomeration is likely to occur, destroying the pore structure and resulting in performance degradation, but it is still stronger than the performance of the polyurethane foam composition without magadiite.

[0045] As can be seen from Table 1, Sn / TiO2 mainly affects the oxygen index of the polyurethane foam composition. Sn / TiO2 helps to increase the interlayer pore diameter of magadiite, enhance the heat insulation performance and optimize the flame retardancy effect, and can effectively improve the fire resistance and heat insulation ability of the polyurethane foam composition.

[0046] As can be seen from Table 1, chitosan mainly affects the dimensional stability of the polyurethane foam composition; when magadiite is added alone, interface incompatibility and uneven dispersion are likely to occur inside the polyurethane foam composition. Chitosan helps to enhance its dispersion and stability in the polyurethane foam composition.

[0047] Comparative Example 2 A polyurethane foam composition of this comparative example is different from that of Example 4 in that this comparative example examines the influence of the dosage of the flame retardant (modified magadiite and [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid) on the performance of the polyurethane foam composition. See Table 3 for details. The remaining formulations and preparation methods are the same as those of Example 4.

[0048] Table 3 Test Results

[0049] As can be seen from Table 3, both flame retardants can improve the flame retardancy of the polyurethane foam composition; however, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid has poor compatibility with the polymer, resulting in a decrease in the mechanical properties of the polyurethane foam composition and a significant decrease in density; when modified magadiite and [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid are compounded at a ratio of 8:2, the oxygen index reaches the highest, and the synergistic effect between the two is the best at this time, and both are higher than the oxygen index when they are used alone.

[0050] The above makes an exemplary description of the present invention. It should be noted that without departing from the core of the present invention, any simple deformation, modification or other equivalent substitution that can be made by those skilled in the art without creative labor falls within the protection scope of the present invention.

Claims

1. A polyurethane foam composition, characterized in that, The polyurethane foam composition is prepared from the following raw materials in parts by weight: 8-20 parts of aromatic isocyanate, 25-40 parts of plant-based polyol, 8-20 parts of polycarbonate diol, 5-8 parts of primary flame retardant, 1-2 parts of secondary flame retardant, 0.3-2 parts of catalyst, 0.5-1 parts of foam stabilizer, 0.3-0.5 parts of water; Wherein, the main flame retardant is modified magadiite; the modified magadiite is prepared by modifying magadiite with Sn / TiO2 and chitosan.

2. The polyurethane foam composition according to claim 1, wherein The preparation method of the modified magadiite is as follows: (1) Tetrabutyl titanate and anhydrous ethanol are mixed uniformly to obtain solution A; glacial acetic acid, tin dichloride, concentrated nitric acid, anhydrous ethanol and water are mixed uniformly to obtain solution B; solution B is added to solution A, and the mixture is stirred continuously, and then magadiite is added, stirred sufficiently, aged at room temperature, dried and calcined to obtain Sn / TiO2-magadiite; (2) Dissolve chitosan in an acetic acid aqueous solution, add Sn / TiO2-magadiite, stir, filter, and dry to obtain modified magadiite.

3. The polyurethane foam composition according to claim 2, characterized in that, In the above (1), the mass ratio of tetrabutyl titanate to tin dichloride is (72-78):1; the mass ratio of tetrabutyl titanate to magadiite is (4-6):1; the continuous stirring time is 1-1.5 hours, and the sufficient stirring time is 3-4 hours.

4. The polyurethane foam composition according to claim 2, wherein In the above (1), the drying temperature is 80-85°C and the drying time is 9-12h; the calcination temperature is 400-500°C and the calcination time is 2-3h.

5. The polyurethane foam composition according to claim 2, wherein In the above (2), the mass ratio of chitosan to Sn / TiO2-magadiite is (4-6):

1.

6. The polyurethane foam composition according to claim 1, characterized in that, The preparation method of the plant-based polyol is as follows: Crush 4-5 parts of peels, add 18-21 parts of liquefier and 1 part of concentrated sulfuric acid, stir and heat to react, cool to room temperature, adjust pH to 7-8, and obtain plant-based polyols.

7. The polyurethane foam composition according to claim 6, characterized in that, The reaction temperature is 110-130° C., and the reaction time is 1-2 hours.

8. The polyurethane foam composition according to claim 6, characterized in that, The liquefier is a mixed liquefier of polyol and ethylene carbonate, and the polyol is selected from one or more of polyethylene glycol, diethylene glycol, propylene glycol, and glycerol.

9. The polyurethane foam composition according to claim 1, characterized in that, The aromatic isocyanate is diphenylmethane diisocyanate or toluene diisocyanate; the secondary flame retardant is [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid; and the catalyst is pentamethyldiethylenetriamine and dimethylethanolamine prepared in a mass ratio of (2-3):

1.

10. The preparation process of the polyurethane foam composition according to any one of claims 1-9, characterized in that, The specific steps are as follows: The plant-based polyol, polycarbonate diol, main flame retardant, secondary flame retardant, catalyst, foam stabilizer and water are uniformly mixed, aromatic isocyanate is added, fully stirred, poured into a mold for foaming, aging and demolding to obtain a polyurethane foam composition.

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