Waterproof and antifouling polyurethane foam and application thereof

Abstract

The application discloses waterproof and antifouling polyurethane foam plastic and application thereof, and belongs to the technical field of polyurethane. The waterproof and antifouling polyurethane foam plastic is made of A component and B component; the A component comprises the following raw materials in parts by weight: 40-60 parts of soft bubble polyether polyol, 10-20 parts of functionally modified polyether polyol, 10-30 parts of NCO-terminated prepolymer, 10-15 parts of flame retardant, 0.2-0.6 parts of catalyst, 1-2 parts of silicone foam stabilizer and 2-5 parts of foaming agent; and the B component is toluene diisocyanate. The polyurethane foam plastic provided by the application has good waterproof performance, antifouling performance, air permeability and flame retardant performance, and can be widely used for manufacturing sofa, mattress, pillow and other furniture products, and automobile seat, partition and other vehicle interior decoration.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane technology, specifically relating to a waterproof and stain-resistant polyurethane foam and its applications. Background Technology

[0002] Polyurethane foam is the most widely used type of polyurethane product, accounting for nearly half of the total. With its excellent elasticity, flexibility, chemical stability, compressive strength, processability, and thermal insulation, polyurethane foam has become an indispensable material in the automotive, construction, home appliance, and medical fields. As technology advances and demands increase, the functional requirements for materials are also rising. In addition to traditional properties, flame retardancy, environmental friendliness, water resistance, and stain resistance are also hot topics in some application areas. For example, when polyurethane foam is used in automotive interior products, components such as seats and door panels are frequently exposed to human sweat, oil stains, and external pollutants. If the material lacks water and stain resistance, it will not only lead to surface stain penetration and decreased aesthetics, but may also cause odors, mold growth, and bacterial transmission due to liquid residue, seriously affecting service life and user experience. Furthermore, in applications such as cold chain logistics, medical device protection, and precision instrument packaging, the material's resistance to moisture, oil, and microorganisms directly affects the safety and reliability of the product.

[0003] Chinese patent CN105924621A discloses a flame-retardant polyurethane flexible foam and its preparation method. The method involves mixing polyether polyol, a nitrogen-containing flame retardant, and a dispersant to form component A. Water, a catalyst, a foam stabilizer, TDI, and component A are then rapidly mixed and poured into a mold for foaming. The foam prepared by this patent has low production cost, high flame retardancy, low volatility, and produces no smoke or toxicity during combustion, ensuring safety. Chinese patent CN107151302A discloses a vegetable oil-based flexible polyurethane foam and its preparation method. Component A is prepared by mixing low-hydroxyl-value vegetable oil polyol, a foam stabilizer, an amine catalyst, an organotin catalyst, a foaming agent, and water. Component B (isocyanate) is then added and foamed. The foam prepared by this patent is non-toxic, biodegradable, and uses renewable raw materials, meeting green environmental protection requirements. However, while the aforementioned technical solutions have achieved breakthroughs in flame retardancy and environmental friendliness, the waterproof and stain-resistant properties of polyurethane foam still need improvement. Furthermore, existing technologies often rely on post-processing techniques to improve waterproofing and stain resistance, such as coatings or composite fabrics, which generally suffer from high costs, complex processes, and poor durability. Therefore, there is an urgent need to develop a waterproof and stain-resistant polyurethane foam. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a method for preparing waterproof and stain-resistant polyurethane foam. By using functional modified polyether polyol, NCO-terminated prepolymer and flexible foam polyether polyol in synergy, and adding an appropriate amount of flame retardant, the foam plastic has good waterproof performance, stain resistance, air permeability and flame retardant performance.

[0005] The technical solution adopted in this invention is as follows:

[0006] This invention provides a waterproof and stain-resistant polyurethane foam plastic, which is made of component A and component B in a weight ratio of 10:4.5-5.0;

[0007] Preferably, component A comprises the following raw materials in parts by weight:

[0008] 40-60 parts flexible foam polyether polyol, 10-20 parts functional modified polyether polyol, 10-30 parts NCO end-capped prepolymer, 10-15 parts flame retardant, 0.2-0.6 parts catalyst, 1-2 parts silicone foam stabilizer, 2-5 parts blowing agent;

[0009] Preferably, component B is toluene diisocyanate.

[0010] When infants and intoxicated individuals travel in vehicles, it is easy for them to spill drinks such as water, milk, and juice (and vomit may also occur). Once these substances seep into car seats, partitions, and other interior materials, they are difficult to clean, and the residue can easily lead to mold growth, strong odors, and negatively impact the hygiene and health of the vehicle interior. Therefore, a polyurethane foam with both waterproof and stain-resistant properties is needed to significantly reduce the risk of these substances seeping into car seats.

[0011] Preferably, the preparation method of the functional modified polyether polyol is as follows:

[0012] Sorbitol and an alkaline catalyst were mixed and heated to react. Epoxy alkane was added to continue the reaction, yielding sorbitol-based polyether polyol. Hexahydroxysorbitol was dehydrated under the catalysis of an alkaline catalyst to form an alkoxide. The alkoxide attacked the epoxy alkane to initiate ring-opening polymerization, yielding sorbitol-based polyether polyol (functionality = 6).

[0013] Glycidyl methacrylate and sorbitol polyether polyol were mixed and heated to react. Hydrogen-containing silicone oil and a metal catalyst were added to initiate an addition reaction. The hydroxyl groups at the end of the polyether nucleophilically attacked the epoxy groups of glycidyl methacrylate to form ether bonds. The acrylic double bonds retained after ring opening under the catalysis of the metal catalyst underwent a hydrosilylation reaction with the hydrogen-containing silicone oil.

[0014] Dimethylaminoethyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, and an initiator are then added to react with glycidyltrimethylammonium chloride and tetrabutylammonium bromide. Free radicals initiate the copolymerization of dimethylaminoethyl methacrylate and 2-(perfluorooctyl)ethyl methacrylate, which is then grafted onto the residual double bonds of the polyether macromolecular chain. The introduction of tertiary amine groups by dimethylaminoethyl methacrylate provides reaction sites for quaternization, while the perfluoroalkyl group further enhances hydrophobicity. The tertiary amine nucleophilically attacks the epoxy groups of glycidyltrimethylammonium chloride, opening the ring and introducing a quaternary ammonium salt structure, thus endowing the material with excellent antibacterial properties.

[0015] Add 2,6-di-tert-butyl-p-cresol and stir until homogeneous to obtain the final product. 2,6-di-tert-butyl-p-cresol can quench free radicals to terminate the reaction and inhibit oxidation, thereby improving product stability.

[0016] Preferably, the weight ratio of sorbitol to alkylene oxide is 2-3:70-80.

[0017] Preferably, the weight ratio of glycidyl methacrylate, sorbitol polyether polyol, hydrogen-containing silicone oil, dimethylaminoethyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, and glycidyltrimethylammonium chloride is 1-4:40-60:5-8:1-5:1-4:4-6.

[0018] This invention combines the aforementioned functionally modified polyether polyols with ordinary polyether polyols to create a material that exhibits hydrophobic and oleophobic properties, while balancing the uniformity of the foam structure and its mechanical properties. Specifically, the introduced siloxane and perfluoroalkyl structures synergistically reduce surface energy, forming a physical barrier to repel water and oil molecules, while the introduced quaternary ammonium salt structure disrupts microbial cell membranes through electrostatic interactions, achieving chemical antibacterial effects.

[0019] Preferably, the preparation method of the functional modified polyether polyol is as follows:

[0020] By weight, 20-30 parts of sorbitol and 1-2 parts of alkaline catalyst are mixed, heated to 110-120℃ under nitrogen atmosphere and reacted for 1-3 hours. Then, 700-800 parts of epoxy alkane are added and the reaction is continued for 3-5 hours to obtain sorbitol-based polyether polyol.

[0021] Mix 1-4 parts glycidyl methacrylate and 40-60 parts sorbitol-based polyether polyol, heat to 60-80℃ and react for 2-4 hours. Add 5-8 parts hydrogen-containing silicone oil and 0.02-0.05 parts metal catalyst, heat to 70-85℃ and react for 2-4 hours. Then add 1-5 parts dimethylaminoethyl methacrylate, 1-4 parts 2-(perfluorooctyl)ethyl methacrylate and 0.1-0.2 parts initiator and react for 3-5 hours. Then add 4-6 parts glycidyltrimethylammonium chloride and 0.05-0.15 parts tetrabutylammonium bromide and react for 1-3 hours. Finally, add 0.01-0.02 parts 2,6-di-tert-butyl-p-cresol and stir until homogeneous to obtain the final product.

[0022] Preferably, the alkaline catalyst is any one of potassium hydroxide, sodium hydroxide, and sodium ethoxide.

[0023] Preferably, the epoxy alkane is composed of propylene oxide and butyl oxide; the weight ratio of propylene oxide to butyl oxide is 3-5:1.

[0024] Preferably, the metal catalyst is any one of a caster catalyst, a lindra catalyst, or a chloroplatinic acid catalyst.

[0025] Preferably, the initiator is any one of dimethyl azobisisobutyrate, azobisisovalerate, and azobisisoheptanenitrile.

[0026] Preferably, the NCO-terminated prepolymer is prepared by reacting bis(3-aminopropyl)-terminated polydimethylsiloxane and diphenylmethane-4,4'-diisocyanate.

[0027] This invention prepolymerizes amino-terminated polysiloxane with isocyanate under high temperature and high pressure to generate NCO-terminated prepolymer, which is used as one of the functional reactive raw materials to further improve the hydrophobic and oleophobic effects of the material.

[0028] Preferably, the method for preparing the NCO-terminated prepolymer is as follows:

[0029] The product is obtained by mixing bis(3-aminopropyl)-terminated polydimethylsiloxane and diphenylmethane-4,4'-diisocyanate at a molar ratio of 1:2.0-2.5 under a nitrogen atmosphere and reacting at 80-90℃ and 0.3-0.7MPa for 70-120 min.

[0030] Preferably, the flame retardant is composed of bis(diphenyl phosphate) and zinc borate; the weight ratio of bis(diphenyl phosphate) to zinc borate is 4:2-4.

[0031] This invention combines the above-mentioned reactive phosphate flame retardant and additive flame retardant to give the material a good flame retardant effect.

[0032] Preferably, the catalyst is composed of a tin-based catalyst and an amine-based catalyst; the weight ratio of the tin-based catalyst to the amine-based catalyst is 3:0.5-1.5.

[0033] This invention improves the air permeability of polyurethane foam by combining different types and amounts of catalysts with an organosilicon foam stabilizer, thereby enabling better foaming and cell opening.

[0034] Preferably, the tin catalyst is at least one of stannous octoate, dibutyltin dilaurate, and dibutyltin diacetate.

[0035] Preferably, the tin catalyst is stannous octoate.

[0036] Preferably, the amine catalyst is at least one selected from N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, and N-ethylmorpholine.

[0037] Preferably, the amine catalyst is N,N-dimethylcyclohexylamine.

[0038] Preferably, the foaming agent is at least one selected from water, propane, n-butane, n-pentane, nitrogen, and carbon dioxide.

[0039] Preferably, the foaming agent is water.

[0040] Preferably, the brand name of the flexible foam polyether polyol is INOVOL F8001A (Yinuowei New Materials); the hydroxyl value of the flexible foam polyether polyol is 32-36 mgKOH / g, and the viscosity (25℃) is 1100-1500 mPa·s.

[0041] Preferably, the toluene diisocyanate is composed of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate in a weight ratio of 75-85:15-25.

[0042] Preferably, the grade of the toluene diisocyanate is [grade number missing]. TDI-80 (Wanhua Chemical); the toluene diisocyanate is composed of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate in a weight ratio of 80:20.

[0043] Preferably, the bis(3-aminopropyl)-terminated polydimethylsiloxane is graded Cheersil 8120 (Qitian New Materials); the viscosity (25°C) of the bis(3-aminopropyl)-terminated polydimethylsiloxane is 30-40 mm. 2 / s.

[0044] Preferably, the hydrogen-containing silicone oil is grade CJ-1000 (Chuangji Organosilicon Materials); the hydrogen content of the hydrogen-containing silicone oil is 1.5-1.6%, and the viscosity (25℃) is 15-50 mm. 2 / s.

[0045] This invention also provides a method for preparing the above-mentioned waterproof and stain-resistant polyurethane foam, comprising the following steps:

[0046] Components A and B are mixed, dispersed at high speed, poured into a mold for free foaming, cured, demolded, and placed at room temperature to obtain the waterproof and stain-resistant polyurethane foam.

[0047] Preferably, the high-speed dispersion rotation speed is 1500-1800 r / min and the time is 10-20 s.

[0048] Preferably, the temperature of the mold is 50-60℃, and the free foaming time is 2-5 minutes.

[0049] Preferably, the curing temperature is 70-85℃ and the time is 20-50 min.

[0050] Preferably, the time for placing the item at room temperature is 40-60 hours.

[0051] This invention also provides the application of the above-mentioned waterproof and stain-resistant polyurethane foam in the preparation of furniture and automotive interiors; including but not limited to sofas, mattresses, pillows, (car, airplane, train, etc.) seats, partitions, etc.

[0052] The beneficial effects of this invention are as follows:

[0053] The waterproof and stain-resistant polyurethane foam prepared by this invention utilizes the synergistic effect of functionally modified polyether polyol, NCO-terminated prepolymer, and flexible foam polyether polyol. The functionally modified polyether polyol uses sorbitol-based polyether polyol as its backbone, and is formed by introducing organosilicon (silicone oil), perfluoroalkyl groups, and quaternary ammonium salt structures through reactions such as epoxy ring-opening, hydrosilylation, free radical polymerization, and quaternization. The NCO-terminated prepolymer is formed by reacting bis(3-aminopropyl)-terminated polydimethylsiloxane and diphenylmethane-4,4'-diisocyanate. Furthermore, an appropriate amount of flame retardant is added, giving the foam not only excellent waterproof, stain-resistant, and antibacterial properties, but also breathability and flame retardancy to meet application requirements. It can be widely used in the manufacture of furniture such as sofas, mattresses, and pillows, as well as automotive interiors such as car seats and partitions. Detailed Implementation

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. 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.

[0055] Some of the raw materials used in the examples are described below:

[0056] Flexible foam polyether polyol, brand name: INOVOL F8001A, hydroxyl value: 34±1.5mgKOH / g, manufacturer: Shandong Yinuowei New Material Co., Ltd.

[0057] Organosilicon foam stabilizer, using G-595 polyurethane flexible foam leveling agent, manufacturer: Dongguan Guangsiyuan Polyurethane Materials Co., Ltd.

[0058] Toluene diisocyanate, brand name: TDI-80, Manufacturer: Wanhua Chemical Group Co., Ltd.

[0059] Bis(3-aminopropyl)-terminated polydimethylsiloxane, brand name: Cheersil 8120, viscosity (25℃): 30-40 mm 2 / s, Manufacturer: Suzhou Qitian New Materials Co., Ltd.

[0060] Hydrogen-containing silicone oil, grade: CJ-1000, hydrogen content: 1.58-1.60%, manufacturer: Zhejiang Chuangji Organosilicon Materials Co., Ltd.

[0061] Example 1

[0062] A waterproof and stain-resistant polyurethane foam, made of component A and component B in a weight ratio of 10:4.8;

[0063] Component A comprises the following raw materials in parts by weight:

[0064] The composition comprises 50 parts flexible foam polyether polyol, 15 parts functional modified polyether polyol, 20 parts NCO-terminated prepolymer, 12 parts flame retardant, 0.4 parts catalyst, 1.5 parts silicone foam leveling agent, and 3 parts blowing agent; the flame retardant is composed of bis(diphenyl phosphate) and zinc borate in a weight ratio of 4:3; the catalyst is composed of tin catalyst and amine catalyst in a weight ratio of 3:1; the tin catalyst is stannous octoate; the amine catalyst is N,N-dimethylcyclohexylamine; and the blowing agent is water.

[0065] Component B is toluene diisocyanate. TDI-80.

[0066] The method for preparing the NCO-terminated prepolymer is as follows:

[0067] The bis(3-aminopropyl)-terminated polydimethylsiloxane and diphenylmethane-4,4'-diisocyanate were mixed in a molar ratio of 1:2.2 under a nitrogen atmosphere and reacted at 85°C and 0.5 MPa for 90 min to obtain the final product.

[0068] The preparation method of the functional modified polyether polyol is as follows:

[0069] By weight, 25 parts of sorbitol and 1.5 parts of potassium hydroxide were mixed and heated to 115°C for 2 hours under a nitrogen atmosphere. Then, 750 parts of epoxy alkane were added and the reaction was continued for 4 hours to obtain sorbitol-based polyether polyol. The epoxy alkane was composed of propylene oxide and butane oxide in a weight ratio of 4:1.

[0070] Mix 2.5 parts glycidyl methacrylate and 50 parts sorbitol polyether polyol, heat to 70℃ and react for 3 hours. Add 6 parts hydrogen-containing silicone oil and 0.03 parts caster catalyst, heat to 80℃ and react for 3 hours. Then add 3.5 parts dimethylaminoethyl methacrylate, 2.5 parts 2-(perfluorooctyl)ethyl methacrylate and 0.15 parts dimethyl azobisisobutyrate and react for 4 hours. Then add 5 parts glycidyltrimethylammonium chloride and 0.1 parts tetrabutylammonium bromide and react for 2 hours. Finally add 0.01 parts 2,6-di-tert-butyl-p-cresol and stir until homogeneous to obtain the final product.

[0071] A method for preparing waterproof and stain-resistant polyurethane foam includes the following steps:

[0072] Mix components A and B, disperse at high speed at 1600 r / min for 15 s, then pour into a mold at 55 ℃ for free foaming for 3 min, cure at 80 ℃ for 30 min, demold, and leave at room temperature for 48 h to obtain the waterproof and stain-resistant polyurethane foam.

[0073] Example 2

[0074] The only difference from Example 1 is that the composition ratio of the waterproof and stain-resistant polyurethane foam is different, and it is made of component A and component B in a weight ratio of 10:4.5.

[0075] Component A comprises the following raw materials in parts by weight:

[0076] The composition comprises 40 parts flexible foam polyether polyol, 10 parts functional modified polyether polyol, 10 parts NCO-terminated prepolymer, 10 parts flame retardant, 0.2 parts catalyst, 1 part silicone foam leveling agent, and 2 parts blowing agent; the flame retardant is composed of bis(diphenyl phosphate) and zinc borate in a weight ratio of 4:2; the catalyst is composed of tin catalyst and amine catalyst in a weight ratio of 3:0.5; the tin catalyst is stannous octoate; the amine catalyst is N,N-dimethylcyclohexylamine; and the blowing agent is water.

[0077] Component B is toluene diisocyanate. TDI-80.

[0078] Example 3

[0079] The only difference from Example 1 is that the composition ratio of the waterproof and stain-resistant polyurethane foam is different, and it is made of component A and component B in a weight ratio of 10:5.0;

[0080] Component A comprises the following raw materials in parts by weight:

[0081] The composition comprises 60 parts flexible foam polyether polyol, 20 parts functional modified polyether polyol, 30 parts NCO-terminated prepolymer, 15 parts flame retardant, 0.6 parts catalyst, 2 parts silicone foam leveling agent, and 5 parts blowing agent; the flame retardant is composed of bis(diphenyl phosphate) and zinc borate in a weight ratio of 4:4; the catalyst is composed of tin catalyst and amine catalyst in a weight ratio of 3:1.5; the tin catalyst is stannous octoate; the amine catalyst is N,N-dimethylcyclohexylamine; and the blowing agent is water.

[0082] Component B is toluene diisocyanate. TDI-80.

[0083] Example 4

[0084] The only difference from Example 1 is that the preparation method of the functional modified polyether polyol is different; the preparation method of the functional modified polyether polyol is as follows:

[0085] By weight, 25 parts of sorbitol and 1.5 parts of potassium hydroxide were mixed and heated to 115°C for 2 hours under a nitrogen atmosphere. Then, 750 parts of epoxy alkane were added and the reaction was continued for 4 hours to obtain sorbitol-based polyether polyol. The epoxy alkane was composed of propylene oxide and butane oxide in a weight ratio of 4:1.

[0086] Mix 2.5 parts glycidyl methacrylate and 50 parts sorbitol polyether polyol, heat to 70℃ and react for 3 hours. Add 6 parts hydrogen-containing silicone oil and 0.03 parts caster catalyst, heat to 80℃ and react for 3 hours. Add 0.01 parts 2,6-di-tert-butyl-p-cresol and stir until homogeneous to obtain the final product.

[0087] Example 5

[0088] The only difference from Example 1 is that the preparation method of the functional modified polyether polyol is different; the preparation method of the functional modified polyether polyol is as follows:

[0089] By weight, 25 parts of sorbitol and 1.5 parts of potassium hydroxide were mixed and heated to 115°C for 2 hours under a nitrogen atmosphere. Then, 750 parts of epoxy alkane were added and the reaction was continued for 4 hours to obtain sorbitol-based polyether polyol. The epoxy alkane was composed of propylene oxide and butane oxide in a weight ratio of 4:1.

[0090] Mix 2.5 parts glycidyl methacrylate and 50 parts sorbitol polyether polyol, heat to 70℃ and react for 3 hours. Then add 3.5 parts dimethylaminoethyl methacrylate, 2.5 parts 2-(perfluorooctyl)ethyl methacrylate and 0.15 parts dimethyl azobisisobutyrate, heat to 80℃ and react for 4 hours. Then add 5 parts glycidyltrimethylammonium chloride and 0.1 parts tetrabutylammonium bromide and react for 2 hours. Finally, add 0.01 parts 2,6-di-tert-butyl-p-cresol and stir until homogeneous to obtain the final product.

[0091] Example 6

[0092] The only difference from Example 1 is that the functional modified polyether polyol is replaced with flexible foam polyether polyol.

[0093] Example 7

[0094] The only difference from Example 1 is that no NCO end-capping prepolymer was added.

[0095] Test Example 1

[0096] The flame retardancy rating of waterproof and stain-resistant polyurethane foam was evaluated with reference to UL-94, and the antibacterial properties of waterproof and stain-resistant polyurethane foam were evaluated with reference to standard GB / T 20944.3-2008 (taking Escherichia coli ATCC8739 as an example). The results are shown in Table 1.

[0097] Table 1. Flame retardant and antibacterial properties of polyurethane foam

[0098] Example 1 V-1 ＞99 Example 2 V-1 ＞99 Example 3 V-1 ＞99

[0099] Test Example 2

[0100] The waterproof performance (water contact angle) of waterproof and stain-resistant polyurethane foam was evaluated according to the standard GB / T 30693-2014. The larger the water contact angle, the better the waterproof performance. The stain resistance (liquid staining method) of waterproof and stain-resistant polyurethane foam was evaluated according to the standard GB / T 30159.1-2013. The higher the staining level, the better the stain resistance. The results are shown in Table 1.

[0101] Table 2. Waterproof and stain-resistant properties of polyurethane foam

[0102]

[0103]

[0104] As can be seen from the test results in Tables 1 and 2 above, the waterproof and stain-resistant polyurethane foam prepared in Examples 1-3 of this invention not only possesses excellent waterproof and stain-resistant properties, but also good flame-retardant and antibacterial properties. Compared with Example 1, Examples 4-5 did not use the functionally modified polyether polyol prepared by the specific process, Example 6 did not add the functionally modified polyether polyol, and Example 7 did not add the NCO-terminated prepolymer, which led to a significant decrease in the waterproof and stain-resistant properties of the polyurethane foam described in Examples 4-7. It is evident that this invention utilizes the synergistic effect of specific functionally modified polyether polyol, NCO-terminated prepolymer, and flexible foam polyether polyol to achieve excellent waterproof and stain-resistant properties in polyurethane foam, thus obtaining beneficial technical effects.

[0105] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A waterproof and stain-resistant polyurethane foam, characterized in that: It is made from component A and component B in a weight ratio of 10:4.5-5.0; Component A comprises the following raw materials in parts by weight: 40-60 parts flexible foam polyether polyol, 10-20 parts functional modified polyether polyol, 10-30 parts NCO end-capped prepolymer, 10-15 parts flame retardant, 0.2-0.6 parts catalyst, 1-2 parts silicone foam stabilizer, 2-5 parts blowing agent; Component B is toluene diisocyanate; The preparation method of the functional modified polyether polyol is as follows: Sorbitol and an alkaline catalyst were mixed and heated to react. Epoxy alkane was added to continue the reaction, yielding sorbitol-based polyether polyol. Glycidyl methacrylate and sorbitol-based polyether polyol were mixed and heated to react. Hydrogen-containing silicone oil and a metal catalyst were added for an addition reaction. Dimethylaminoethyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, and an initiator were then added to react. Glycidyltrimethylammonium chloride and tetrabutylammonium bromide were added to react, and 2,6-di-tert-butyl-p-cresol was added and stirred until homogeneous to obtain the final product. The NCO-terminated prepolymer is prepared by reacting bis(3-aminopropyl)-terminated polydimethylsiloxane and diphenylmethane-4,4'-diisocyanate.

2. The waterproof and stain-resistant polyurethane foam according to claim 1, characterized in that: The weight ratio of sorbitol to epoxy alkane is 2-3:70-80; the weight ratio of glycidyl methacrylate, sorbitol-based polyether polyol, hydrogen-containing silicone oil, dimethylaminoethyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, and glycidyltrimethylammonium chloride is 1-4:40-60:5-8:1-5:1-4:4-6.

3. The waterproof and stain-resistant polyurethane foam according to claim 1, characterized in that: The alkaline catalyst is any one of potassium hydroxide, sodium hydroxide, and sodium ethoxide; the epoxide alkane is composed of propylene oxide and butyl oxide; the metal catalyst is any one of caster catalyst, Lindra catalyst, and chloroplatinic acid catalyst; and the initiator is any one of dimethyl azobisisobutyrate, azobisisovalerate, and azobisisoheptanenitrile.

4. The waterproof and stain-resistant polyurethane foam according to claim 1, characterized in that: The flame retardant is composed of bis(diphenyl phosphate) and zinc borate.

5. The waterproof and stain-resistant polyurethane foam according to claim 1, characterized in that: The catalyst is composed of tin-based catalysts and amine-based catalysts; the tin-based catalyst is at least one of stannous octoate, dibutyltin dilaurate, and dibutyltin diacetate; the amine-based catalyst is at least one of N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, and N-ethylmorpholine.

6. The waterproof and stain-resistant polyurethane foam according to claim 1, characterized in that: The foaming agent is at least one of water, propane, n-butane, n-pentane, nitrogen, and carbon dioxide.

7. The method for preparing waterproof and stain-resistant polyurethane foam according to any one of claims 1-6, characterized in that: Includes the following steps: Components A and B are mixed, dispersed at high speed, poured into a mold for free foaming, cured, demolded, and placed at room temperature to obtain the waterproof and stain-resistant polyurethane foam.

8. The application of waterproof and stain-resistant polyurethane foam according to any one of claims 1-6 in the preparation of furniture and automotive interiors.

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