Polyurethane foam composition and preparation process

Abstract

The invention belongs to the technical field of polymer materials and particularly relates to a polyurethane foam composition and a preparation process. The polyurethane foam composition 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 a main flame retardant, 1-2 parts of a secondary flame retardant, 0.3-2 parts of a catalyst, 0.5-1 parts of a foam stabilizer, and 0.3-0.5 parts of water. The main flame retardant is modified magadiite, which is prepared by modifying the magadiite with Sn / TiO2 and chitosan. The polyurethane foam composition of the invention has a small amount of the main flame retardant, the modified magadiite, and the secondary flame retardant added. Through a reasonable and scientific ratio, the polyurethane foam composition has excellent flame retardant properties and good mechanical properties.

Description

Technical Field

[0001] The 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 carbamate (-NHCOO-) structural units in its backbone. Its products are widely used in foams, rubber, synthetic leather, and coatings. Due to its excellent thermal insulation properties and mechanical strength, polyurethane foam is commonly used as a cushioning material, insulation material, packaging, and construction material. Many of these applications require high flame retardancy. Accordingly, methods for achieving flame retardancy in polyurethane foam have been developed. Adding flame retardants is a common method for preparing flame-retardant polyurethane foam. Commonly used flame retardants are halogen- and phosphorus-containing compounds.

[0003] A Chinese patent application document with application publication number CN110799563A discloses a flame-retardant polyurethane foam. The patent is composed of or formed from components including at least one isocyanate-reactive sulfur-containing compound and at least one isocyanate-reactive brominated flame retardant. The resulting polyurethane foam has excellent flame retardant properties; however, halogen-containing flame retardants, especially brominated flame retardants, are not ideal, and produce large amounts of smoke and are highly toxic when burned.

[0004] A Chinese patent application with publication number CN104892889A discloses a rigid flame-retardant polyurethane foam. The flame retardant used in this patent is a composite composition of an organophosphorus flame retardant and an inorganic flame retardant. The amount of the flame retardant accounts for 25wt%-45wt% of the total weight of the composition. By rationally proportioning the components, a polyurethane foam with good flame retardancy is produced while reducing the emission of toxic fumes. However, excessive content of the organophosphorus flame retardant can easily reduce the mechanical properties of the polyurethane foam material and shorten the service life of the material. Summary of the Invention

[0005] The flame retardancy and mechanical properties of existing polyurethane foams cannot be well balanced. To solve this problem, the present invention provides a polyurethane foam composition and a preparation process.

[0006] In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a polyurethane foam composition, which is prepared from the following raw materials in parts by weight:

[0008] 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;

[0009] Wherein, the main flame retardant is modified magadiite; the modified magadiite is prepared by modifying magadiite with Sn / TiO2 and chitosan.

[0010] Preferably, the preparation method of the modified magadiite is as follows:

[0011] (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 thoroughly, aged at room temperature, dried, and calcined to obtain Sn / TiO2-magadiite;

[0012] (2) Dissolve chitosan in an acetic acid aqueous solution, add Sn / TiO2-magadiite, stir, filter, and dry to obtain modified magadiite.

[0013] Preferably, in said (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.

[0014] 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.

[0015] Preferably, in (2), the mass ratio of chitosan to Sn / TiO2-magadiite is (4-6):1.

[0016] Preferably, the preparation method of the plant-based polyol is as follows:

[0017] 4-5 parts of peels are crushed, 18-21 parts of liquefier and 1 part of concentrated sulfuric acid are added, stirred and heated to react, cooled to room temperature, and the pH is adjusted to 7-8 to obtain plant-based polyols.

[0018] Preferably, the reaction temperature is 110-130° C., the reaction time is 1-2 h, and the pH is 7-8.

[0019] 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.

[0020] 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.

[0021] In a second aspect, the present invention provides a process for preparing the polyurethane foam composition, comprising the following steps:

[0022] The plant-based polyol, polycarbonate diol, main flame retardant, secondary flame retardant, catalyst, foam stabilizer and water are evenly mixed, aromatic isocyanate is added, fully stirred, poured into a mold for foaming, aging and demolding to obtain a polyurethane foam composition.

[0023] The foam stabilizer used in the present invention is a foam stabilizer commonly used in polyurethane foam, such as silicone oil AK-158, silicone oil AK-8805, silicone oil AK-8806, etc.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The modified magadiite prepared by the present invention can effectively improve the fire resistance and thermal isolation ability of the polyurethane foam composition by increasing the interlayer pore size, enhancing the thermal 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 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 to form a gas and carbon soot layer with thermal insulation and flame retardant effects, which hinders the entry of oxygen and heat and slows down the burning speed 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 spread of the flame, reducing the combustion rate and the thermal radiation of the flame;

[0026] (2) The chitosan in the modified magadiite of the present invention can chemically react with the surface of the magadiite, thereby improving the heat resistance and thermal stability of the magadiite, thereby enhancing its long-term stability in the polyurethane foam composition; at the same time, chitosan, as a natural polysaccharide, has good biocompatibility and flexibility, so that it can be used as a carrier of magadiite to improve its dispersibility and stability in the polyurethane foam composition, thereby improving the mechanical properties and durability of the polyurethane foam composition;

[0027] (3) Fruit peels, such as grapefruit peels, are rich in cellulose and polysaccharides, which can be converted into polyols containing hydroxyl groups through liquefaction reactions. They can replace petroleum-based polyols in the preparation of polyurethane foam compositions, thereby reducing the use of petroleum-based polyols and the production cost of polyurethane foam compositions, and being environmentally friendly.

[0028] (4) The polyurethane foam composition of the present invention has a small amount of modified magadiite as the main flame retardant and a small amount of secondary flame retardant added. Through reasonable and scientific proportioning, the polyurethane foam composition has excellent flame retardant properties and good mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a SEM image of the polyurethane foam composition of the present invention;

[0030] Figure 2 is an SEM image of the magadiite of the present invention;

[0031] Figure 3 This is an SEM image of the modified magadiite of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is explained in detail below with reference to several representative embodiments of the present invention.

[0033] 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 are all commercially available.

[0034] Example 1

[0035] A polyurethane foam composition of this embodiment is prepared from the following raw materials:

[0036] 1.2kg of diphenylmethane diisocyanate, 2.5kg of plant-based polyols, 1kg of polycarbonate diol, 0.6kg of modified malt hydroxy sodium silicate, 0.12kg of [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, 0.075kg of pentamethyldiethylenetriamine, 0.025kg of dimethylethanolamine, 0.08kg of silicone oil AK-158, and 0.03kg of water.

[0037] The specific steps of the preparation process of the polyurethane foam composition of this embodiment are as follows:

[0038] Plant-based polyol, polycarbonate diol, modified malt hydroxy sodium silicate, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158 and water were mixed evenly, and then diphenylmethane diisocyanate was added and stirred for 10 seconds. The mixture was poured into a mold for foaming, demolded after 40 minutes, placed in a vacuum oven for aging at 60°C for 24 hours, and demolded to obtain a polyurethane foam composition.

[0039] Figure 1 is the SEM image of the polyurethane foam composition. Figure 1It can be seen that the cells are approximately ellipsoidal and the cell size is relatively uniform.

[0040] The specific steps of the preparation method of the modified magadiite of this embodiment are as follows:

[0041] (1) 72.92 g of tetrabutyl titanate and 300 g of anhydrous ethanol were mixed to obtain solution A; 0.2 g of glacial acetic acid, 0.99 g of tin dichloride, 10 g of 65% concentrated nitric acid, 50 g of anhydrous ethanol, and 4.5 g of water were mixed to obtain solution B; solution B was added to solution A and stirred continuously for 1.5 h, and then 18.23 g of magadiite was added and stirred thoroughly for 3 h, aged at room temperature for 24 h, dried at 80 ° C for 10 h, and calcined at 400 ° C for 2 h to obtain Sn / TiO2-magadiite;

[0042] (2) Dissolve 12 g of chitosan in 300 g of 4% acetic acid aqueous solution, add 2 g of Sn / TiO2-magadiite, stir, filter, and dry to obtain modified magadiite.

[0043] Figure 2 is the SEM image of the magadiite of the present invention, Figure 3 This is an SEM image of the modified magadiite of the present invention. Figure 2 The medium magadiite presents a relatively uniform rose-shaped thin layer structure with a smooth skeleton surface. Figure 3 The interlayer spacing of the modified magadiite increases, the surface of the lamellae becomes rough, the rose-shaped structure is destroyed, and it no longer presents a tightly packed state.

[0044] The specific steps of the preparation method of the plant-based polyol of this embodiment are as follows:

[0045] Crush 40g of grapefruit peel, add 108g of polyethylene glycol, 72g of ethylene carbonate and 10g of 98% concentrated sulfuric acid, stir and heat to 110°C for 1.5h, cool to room temperature, adjust the pH to 8, stir for 1h, and filter to obtain plant-based polyol.

[0046] Example 2

[0047] A polyurethane foam composition of this embodiment is prepared from the following raw materials:

[0048] 1.5kg of toluene diisocyanate, 3.5kg of plant-based polyol, 2kg of polycarbonate diol, 0.5kg of modified malt hydroxy sodium silicate, 0.1kg of [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, 0.02kg of pentamethyldiethylenetriamine, 0.01kg of dimethylethanolamine, 0.1kg of silicone oil AK-158, and 0.035kg of water.

[0049] The specific steps of the preparation process of the polyurethane foam composition of this embodiment are as follows:

[0050] Plant-based polyol, polycarbonate diol, modified malt hydroxy sodium silicate, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158 and water are mixed evenly, and then toluene diisocyanate is added and stirred for 10 seconds. The mixture is poured into a mold for foaming, demolded after 40 minutes, placed in a vacuum oven for aging at 60°C for 24 hours, and demolded to obtain a polyurethane foam composition.

[0051] The specific steps of the preparation method of the modified magadiite of this embodiment are as follows:

[0052] (1) 109.38 g of tetrabutyl titanate and 300 g of anhydrous ethanol were mixed to obtain solution A; 0.2 g of glacial acetic acid, 1.44 g of tin dichloride, 10 g of 65% concentrated nitric acid, 50 g of anhydrous ethanol, and 5 g of water were mixed to obtain solution B; solution B was added to solution A and stirred continuously for 1 h, and then 18.23 g of magadiite was added and 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;

[0053] (2) Dissolve 9 g of chitosan in 300 g of 4% acetic acid aqueous solution, add 2 g of Sn / TiO2-magadiite, stir, filter and dry to obtain modified magadiite.

[0054] The specific steps of the preparation method of the plant-based polyol of this embodiment are as follows:

[0055] Crush 50g of grapefruit peel, add 70g of propylene glycol, 70g of diethylene glycol, 70g of ethylene carbonate and 10g of 98% concentrated sulfuric acid, stir and heat to 115°C for 1h, cool to room temperature, adjust the pH to 7, stir for 1h, and filter to obtain plant-based polyol.

[0056] Example 3

[0057] A polyurethane foam composition of this embodiment is prepared from the following raw materials:

[0058] 0.8kg of diphenylmethane diisocyanate, 4kg of plant-based polyol, 0.8kg of polycarbonate diol, 0.7kg of modified malt hydroxy sodium silicate, 0.15kg of [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, 0.15kg of pentamethyldiethylenetriamine, 0.05kg of dimethylethanolamine, 0.05kg of silicone oil AK-158, and 0.05kg of water.

[0059] The specific steps of the preparation process of the polyurethane foam composition of this embodiment are as follows:

[0060] Plant-based polyol, polycarbonate diol, modified malt hydroxy sodium silicate, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158 and water were mixed evenly, and then diphenylmethane diisocyanate was added and stirred for 10 seconds. The mixture was poured into a mold for foaming, demolded after 40 minutes, placed in a vacuum oven for aging at 60°C for 24 hours, and demolded to obtain a polyurethane foam composition.

[0061] The specific steps of the preparation method of the modified magadiite of this embodiment are as follows:

[0062] (1) 91.15 g of tetrabutyl titanate and 300 g of anhydrous ethanol were mixed to obtain solution A; 0.2 g of glacial acetic acid, 1.27 g of tin dichloride, 10 g of 65% concentrated nitric acid, 50 g of anhydrous ethanol, and 5 g of water were mixed to obtain solution B; solution B was added to solution A and stirred continuously for 1.5 h, and then 18.23 g of magadiite was added and 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;

[0063] (2) Dissolve 10 g of chitosan in 300 g of 4% acetic acid aqueous solution, add 2 g of Sn / TiO2-magadiite, stir, filter and dry to obtain modified magadiite.

[0064] The specific steps of the preparation method of the plant-based polyol of this embodiment are as follows:

[0065] 45g of grapefruit peel was crushed, 120g of propylene glycol, 80g of ethylene carbonate and 10g of 98% concentrated sulfuric acid were added, the mixture was stirred and heated to 130°C for 2h, cooled to room temperature, adjusted to pH 7, and filtered to obtain plant-based polyol.

[0066] Example 4

[0067] A polyurethane foam composition of this embodiment is prepared from the following raw materials:

[0068] Toluene diisocyanate 2kg, plant-based polyol 3kg, polycarbonate diol 1.6kg, modified malt hydroxy sodium silicate 0.8kg, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid 0.2kg, pentamethyldiethylenetriamine 0.1kg, dimethylethanolamine 0.05kg, silicone oil AK-158 0.07kg, water 0.04kg.

[0069] The specific steps of the preparation process of the polyurethane foam composition of this embodiment are as follows:

[0070] Plant-based polyol, polycarbonate diol, modified malt hydroxy sodium silicate, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid, pentamethyldiethylenetriamine, dimethylethanolamine, silicone oil AK-158 and water are mixed evenly, and then toluene diisocyanate is added and stirred for 10 seconds. The mixture is poured into a mold for foaming, demolded after 40 minutes, placed in a vacuum oven for aging at 60°C for 24 hours, and demolded to obtain a polyurethane foam composition.

[0071] The specific steps of the preparation method of the modified magadiite of this embodiment are as follows:

[0072] (1) 82.04 g of tetrabutyl titanate and 300 g of anhydrous ethanol were mixed to obtain solution A; 0.2 g of glacial acetic acid, 4.05 g of tin dichloride, 10 g of 65% concentrated nitric acid, 50 g of anhydrous ethanol, and 4.5 g of water were mixed to obtain solution B; solution B was added to solution A and stirred continuously for 1 h, and then 18.23 g of magadiite was added and 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;

[0073] (2) Dissolve 8 g of chitosan in 300 g of 4% acetic acid aqueous solution, add 2 g of Sn / TiO2-magadiite, stir, filter and dry to obtain modified magadiite.

[0074] The specific steps of the preparation method of the plant-based polyol of this embodiment are as follows:

[0075] 40 g of grapefruit peel was crushed, and 120 g of propylene glycol, 60 g of ethylene carbonate and 10 g of 98% concentrated sulfuric acid were added. The mixture was stirred and heated to 120°C for 1 hour. After cooling to room temperature, the pH was adjusted to 8 and filtered to obtain plant-based polyol.

[0076] Performance Testing

[0077] The polyurethane foam compositions obtained in Examples 1 to 4 were subjected to relevant tests, as shown in Table 1.

[0078] Density: GB / T6343-2009 "Determination of apparent density of cellular plastics and rubber";

[0079] Compression strength: GB / T8813-2008 "Determination of compression properties of rigid cellular plastics";

[0080] Dimensional stability: GB / T8811-2008 "Compression test method for dimensional stability of rigid foam plastics";

[0081] Thermal conductivity: GB / T3399-1982 "Test method for thermal conductivity of plastics - Guarded plate method";

[0082] Oxygen index: GB / T2406.2-2009 "Plastics - Determination of combustion behavior by oxygen index method - Part 2: Room temperature test".

[0083] Table 1 Test results

[0084]

[0085] Comparative Example 1

[0086] The polyurethane foam composition of this comparative example is different from that of Example 4 in that this comparative example investigates the effect of modified magadiite on the performance of the polyurethane foam composition, as shown in Table 2. The rest of the formula and preparation method are the same as those of Example 4.

[0087] Table 2 Test results

[0088]

[0089] 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. The magadiite bears the load, improves the pressure resistance of the bubble body, and increases the compressive strength. After being modified by chitosan and Sn / TiO2, the mechanical properties and flame retardant properties of the polyurethane foam composition are significantly improved. With the increase in the amount of modified magadiite, the density, compressive strength, flame retardant properties, etc. of the polyurethane foam composition also increase. When the amount of modified magadiite added is too much, agglomeration is likely to occur, which destroys the pore structure and leads to a decrease in performance, but it is still better than the performance of the polyurethane foam composition when no magadiite is added.

[0090] 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 size of magadiite, enhance the thermal insulation performance and optimize the flame retardant effect, and can effectively improve the fire resistance and thermal insulation capacity of the polyurethane foam composition.

[0091] As shown in Table 1, chitosan mainly affects the dimensional stability of the polyurethane foam composition; the addition of magadiite alone easily causes interfacial incompatibility and uneven dispersion within the polyurethane foam composition, while chitosan helps to enhance its dispersibility and stability in the polyurethane foam composition.

[0092] Comparative Example 2

[0093] The polyurethane foam composition of this comparative example differs from that of Example 4 in that this comparative example examines the effect of the amount of flame retardant (modified magadiite and [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid) on the properties of the polyurethane foam composition, as shown in Table 3. The remaining formula and preparation method are the same as those of Example 4.

[0094] Table 3 Test results

[0095]

[0096] As can be seen from Table 3, both flame retardants can improve the flame retardant properties of the polyurethane foam composition; however, [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid has poor compatibility with the polymer, which reduces the mechanical properties of the polyurethane foam composition and significantly reduces the density; when modified magnesia hydroxynadalite 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 of the two is the best at this time, and both are higher than the oxygen index when the two are used alone.

[0097] The above is 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 replacement that can be made by other skilled in the art without expending creative labor shall fall within the scope of protection 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 mass: 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, and 0.3-0.5 parts of water; the secondary flame retardant is [[(2-hydroxyethyl)imino]bis(methylene)]diphosphonic acid; The main flame retardant is modified magadiite; the modified magadiite is prepared by modifying magadiite with Sn / TiO2 and chitosan, specifically: (1) tetrabutyl titanate and anhydrous ethanol are mixed evenly to obtain solution A; glacial acetic acid, tin dichloride, concentrated nitric acid, anhydrous ethanol and water are mixed evenly to obtain solution B; solution B is added to solution A, stirred continuously, and then magadiite is added, stirred thoroughly, 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.

2. The polyurethane foam composition according to claim 1, 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.

3. The polyurethane foam composition according to claim 1, characterized in that In the above (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.

4. The polyurethane foam composition according to claim 1, characterized in that In the above (2), the mass ratio of chitosan to Sn / TiO2-magadiite is (4-6):

1.

5. The polyurethane foam composition according to claim 1, characterized in that The preparation method of the plant-based polyol is as follows: 4-5 parts of peels are crushed, 18-21 parts of liquefier and 1 part of concentrated sulfuric acid are added, stirred and heated to react, cooled to room temperature, and the pH is adjusted to 7-8 to obtain plant-based polyols.

6. The polyurethane foam composition according to claim 5, characterized in that The reaction temperature is 110-130° C., and the reaction time is 1-2 h.

7. The polyurethane foam composition according to claim 5, 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.

8. The polyurethane foam composition according to claim 1, characterized in that The aromatic isocyanate is diphenylmethane diisocyanate or toluene diisocyanate; the catalyst is pentamethyldiethylenetriamine and dimethylethanolamine prepared in a mass ratio of (2-3):

1.

9. The process for preparing the polyurethane foam composition according to any one of claims 1 to 8, wherein: The specific steps are as follows: The plant-based polyol, polycarbonate diol, main flame retardant, secondary flame retardant, catalyst, foam stabilizer and water are evenly 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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