Polyurethane foam material as well as preparation method and application thereof

Abstract

The invention provides a polyurethane foaming material as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out chemical treatment on a recycled polyurethane foaming material to obtain a polyol regenerated material; mixing the polyol regenerated material, petroleum-based polyol, a catalyst, a foaming agent and a foaming stabilizer to obtain a premix; wherein the mass ratio of the polyol regenerated material in the alcohol raw materials is 5%-30%; mixing the premix with isocyanate to prepare a new polyurethane foaming material; wherein the molar ratio of isocyanate to hydroxyl in the premix is (1.0-1.12): 1. The polyurethane foaming material prepared by replacing a part of petroleum-based polyol with the recycled polyol regenerated material can be equivalent to the polyurethane foaming material prepared from the traditional petroleum-based polyol in the aspects of density, hardness, compressive strength, tensile strength and other mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of polyurethane recycling, and more particularly to a polyurethane foam material, its preparation method, and its application. Background Technology

[0002] With the rapid development of the automotive industry and the continuous increase in vehicle ownership, the issue of vehicle scrapping is becoming increasingly prominent. Polyurethane (PU) foam is commonly used to fill the interior of vehicle parts. This material has excellent cushioning, heat insulation, and molding properties, making it one of the most widely used polymer foam materials in automotive interiors. However, as a large number of vehicles reach the end of their service life, the issue of recycling and reusing polyurethane foam materials in steering wheels is gradually becoming more prominent.

[0003] Currently, the disposal of steering wheels from scrapped cars mainly involves physical shredding or incineration. While incineration can quickly reduce the volume of waste, it releases large amounts of harmful gases, such as nitrogen oxides, hydrogen cyanide, and other volatile organic compounds, causing serious environmental pollution and potential health risks. Physical shredding, although capable of partial recycling, results in structurally damaged and performance-degraded recycled materials, making it difficult to meet the requirements for remanufacturing or high-performance products. Furthermore, due to the stable cross-linked structure of polyurethane, traditional chemical recycling processes are energy-intensive and inefficient, limiting their large-scale industrial application.

[0004] To address the aforementioned issues, there is an urgent need to develop an efficient and environmentally friendly technology for recycling and reusing polyurethane foam materials, so as to reduce environmental pollution while achieving resource recycling. Summary of the Invention

[0005] This invention provides a polyurethane foam material, its preparation method, and its application, enabling the preparation of new polyurethane foam materials using recycled polyurethane foam materials.

[0006] In a first aspect, this application provides a method for preparing a polyurethane foam material, the method comprising:

[0007] The recycled polyurethane foam is chemically treated to obtain polyol recycled material;

[0008] The recycled polyol, petroleum-based polyol, catalyst, foaming agent, and foaming stabilizer are mixed to obtain a premix; wherein the recycled polyol accounts for 5% to 30% of the mass of the alcohol raw materials.

[0009] The premix is ​​mixed with isocyanate to prepare a new polyurethane foam; wherein the molar ratio of the isocyanate to the hydroxyl groups of the polyol in the premix is ​​(1.0-1.12):1.

[0010] Furthermore, the catalyst is a metal catalyst or an amine catalyst, and the metal catalyst includes one or more of tin catalysts, bismuth catalysts, zinc catalysts, and zirconium catalysts.

[0011] Furthermore, the molar ratio of the amine catalyst to the metal catalyst is (2.5~4):1.

[0012] Furthermore, the mass fraction of the catalyst used per 100 parts of the polyol recycled material is 0.5 to 3 parts.

[0013] Furthermore, the mass fraction of the foaming stabilizer used per 100 parts of the polyol recycled material is 0.5-1.5 parts.

[0014] Furthermore, the recycled polyurethane foam material is chemically treated to obtain polyol recycled material, including:

[0015] The polyurethane foam material recovered from the recycling equipment is chemically treated to obtain the first recycled material;

[0016] The scraps generated during the production of polyurethane foam based on petroleum-based polyols are chemically treated to obtain a second recycled material.

[0017] The first recycled material and the second recycled material are mixed to obtain the polyol recycled material.

[0018] Furthermore, the recycled polyurethane foam material is chemically treated to obtain polyol recycled material, including:

[0019] The scraps generated during the production of polyurethane foam based on petroleum-based polyols are chemically treated to obtain the recycled polyol material.

[0020] Furthermore, the recycled polyurethane foam material is chemically treated to obtain polyol recycled material, including:

[0021] The polyurethane foam material recovered from the recycling equipment is chemically treated to obtain the polyol recycled material.

[0022] Furthermore, the ratio of the first recycled material to the second recycled material is (1~4):1.

[0023] Furthermore, before the polyurethane foam material recovered from the recycling equipment is chemically treated to obtain polyol recycled material, the preparation method further includes:

[0024] The equipment to be recycled is boiled in water to remove the foaming material; the boiling solution is water with added sodium carbonate and surfactant.

[0025] The stripped foam material is crushed to a preset size and then screened through a density sorting tank. The floating material is collected as the recycled polyurethane foam material, wherein the density of the density sorting tank is 1.1-1.2 g / cm³. 3 .

[0026] Secondly, this application provides a polyurethane foam material, which is obtained by the preparation method of polyurethane foam material described in any one of the first aspects.

[0027] Thirdly, this application provides a steering wheel, wherein the foaming material used in the steering wheel is prepared by the method for preparing polyurethane foaming material as described in any one of the first aspects.

[0028] Fourthly, this application provides a method for injection molding a steering wheel, wherein the premixed material and isocyanate from the preparation method of polyurethane foam material according to any one of the first aspects are injected into a steering wheel mold through a high-pressure mixing injection molding process for foaming and molding.

[0029] Fifthly, this application provides an in-vehicle component, wherein the foaming material used in the in-vehicle component is prepared by the polyurethane foaming material preparation method described in any one of the first aspects.

[0030] This invention provides a polyurethane foam material, its preparation method, and its application. The preparation method includes:

[0031] Recycled polyurethane foam is chemically treated to obtain recycled polyol. The recycled polyol, petroleum-based polyol, catalyst, foaming agent, and foaming stabilizer are mixed to obtain a premix. The recycled polyol accounts for 5%–30% of the total alcohol content. The premix is ​​then mixed with isocyanate to prepare a new polyurethane foam. The molar ratio of the hydroxyl groups in the isocyanate to the polyol in the premix is ​​(1.0–1.12):1. Polyurethane foam prepared by replacing a portion of the petroleum-based polyol with recycled polyol can achieve comparable mechanical properties to polyurethane foam prepared from traditional petroleum-based polyols in terms of density, hardness, compressive strength, and tensile strength. Attached Figure Description

[0032] Figure 1 A flowchart illustrating a method for recycling polyurethane foam material provided in this application;

[0033] Figure 2 A flowchart illustrating the foam disassembly method for used steering wheels;

[0034] Figure 3 This is a flowchart illustrating the crushing and purification process for foamed materials. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] With the rapid development of the automotive industry, the number of scrapped vehicles is increasing year by year. Steering wheels and other components are important safety parts of automobiles, and their interiors are typically filled with polyurethane (PU) foam to provide good cushioning and comfort. However, in traditional methods of scrapping vehicles, steering wheels are often shredded or incinerated, resulting in the waste of polyurethane foam and environmental pollution.

[0037] Polyurethane materials release large amounts of harmful gases, such as nitrogen oxides and hydrogen cyanide, during incineration, posing a threat to the environment and human health. Materials obtained through physical recycling methods (such as crushing) have poor performance and are difficult to reuse in the manufacture of high-end products.

[0038] In view of this, this application proposes a method for reproducing new polyurethane foam based on recycled polyurethane foam. The recycled polyurethane foam is chemically treated to transform it into polyol recycled material, and the recycled polyol recycled material replaces the petroleum-based polyol. The replacement ratio can be up to 30%. Under the replacement ratio of 30%, the mechanical properties of the polyurethane foam remain basically unchanged.

[0039] Figure 1 A flowchart illustrating a method for recycling polyurethane foam material provided in this application is shown below. Figure 1 As shown, it includes the following steps:

[0040] S1. The recycled polyurethane foam is chemically treated to obtain polyol recycled material.

[0041] S2. Mix the polyol recycled material, petroleum-based polyol, catalyst, foaming agent and foaming stabilizer to obtain a premix; wherein the mass ratio of the polyol recycled material in the alcohol raw materials is 5%~30%.

[0042] S3. The premix is ​​mixed with isocyanate to prepare a new polyurethane foam; wherein the molar ratio of the hydroxyl groups of the isocyanate to the polyol in the premix is ​​(1.0-1.12):1.

[0043] In step S1, waste polyurethane foam material is broken down into small pieces or particles using mechanical methods (such as crushing or pulverizing). These small pieces or particles of waste polyurethane foam are then mixed with water or an acidic solution and subjected to a hydrolysis reaction under specific temperature and pressure to release the original polyols (e.g., polyether polyols). The hydrolysis process effectively breaks the ester bonds in the polyurethane, converting the foam material into recycled polyol material.

[0044] In step S2, the recovered polyol recycled material is mixed with petroleum-based polyols at a specific mass ratio. The mass percentage of the polyol recycled material in the alcohol raw materials is 5% to 30%, with the remainder being petroleum-based polyols. The mass ratio can be 7:3, 8:2, or 9:1, or any combination thereof.

[0045] In the formulation of foaming materials, a catalyst is required for foaming catalysis. A mixed catalyst, combining amine and metal catalysts, can be used to optimize the foaming reaction rate and control the cell structure. Water or other auxiliary foaming agents can be selected to control foam formation and ensure uniformity of the foaming effect. Foaming stabilizers can be siloxane-modified silicone oils to improve cell stability and foam uniformity.

[0046] The isocyanate and the hydroxyl groups of the polyol in the premix are mixed at a molar ratio of (1.0-1.12):1 to ensure complete chemical reaction between the cyano groups and the hydroxyl groups. The mixed system is then subjected to heat treatment or chemical crosslinking treatment to obtain a new polyurethane foam.

[0047] By optimizing the mixing ratio, polyurethane foam prepared using recycled polyols can achieve comparable mechanical properties to polyurethane foam prepared using traditional petroleum-based polyols in terms of density, hardness, compressive strength, and tensile strength.

[0048] In some embodiments, the catalyst is a metal catalyst or an amine catalyst. The metal catalyst includes one or more of tin catalysts, bismuth catalysts, zinc catalysts, and zirconium catalysts.

[0049] Specifically, tin-based catalysts, such as diethyltin dilaurate (Sn(Oct)2), can enhance the catalytic efficiency of polyurethane reactions, increase the reaction rate, and reduce side reactions. Amine catalysts, such as triethanolamine and diethylamine, accelerate the reaction between isocyanates and polyols, promote the foaming reaction, help control the cell structure, and ensure the uniformity of the foam material. Tin-based and amine catalysts have complementary catalytic effects; tin-based catalysts provide initial catalytic activity, while amine catalysts provide reaction acceleration.

[0050] In some embodiments, the mass ratio of amine catalyst to tin catalyst is (2.5~4):1, for example, 2.5:1, 3:1, or 4:1. By adjusting the ratio, the catalytic efficiency and foam performance can be adjusted. Within this ratio, it is possible to ensure that the tin catalyst provides sufficient catalytic effect while the amine catalyst maintains a suitable reaction rate, neither leading to an excessively fast reaction nor reducing the uniformity of the foam.

[0051] In some embodiments, the mass fraction of catalyst used per 100 parts of recycled polyol material is 0.5 to 3 parts, for example, 0.5 parts, 1 part, 2 parts, 3 parts, or any combination thereof. Too much catalyst may cause the reaction to be too fast, generating excessive heat and affecting the quality of the foam; too little catalyst may cause the reaction to be incomplete, affecting the foaming effect. Therefore, an appropriate amount of catalyst helps to improve the mechanical properties of the foam and reduce the brittleness of the material.

[0052] In some embodiments, the mass fraction of foaming stabilizer used per 100 parts of recycled polyol material is 0.5-1.5 parts, for example, 0.5 parts, 1.0 parts, 1.2 parts, 1.5 parts, or any combination thereof. Foaming stabilizers include silicone oil-based and polyether-based stabilizers. The function of foaming stabilizers is to maintain the stability of the cell structure, prevent cell rupture, and ensure that the foam structure is not disturbed. A reasonable amount of foaming stabilizer helps ensure the uniformity and stability of the cell structure, avoiding cell rupture or unevenness.

[0053] In some embodiments, the recycled polyurethane foam is chemically treated to obtain a polyol recycled material, comprising:

[0054] The polyurethane foam material recovered from the recycling equipment is chemically treated to obtain the first recycled material;

[0055] The scraps generated during the production of polyurethane foam based on petroleum-based polyols are chemically treated to obtain a second recycled material.

[0056] The first and second recycled materials are mixed to obtain polyol recycled materials.

[0057] The scraps generated during the production of polyurethane foam from petroleum-based polyols have relatively high purity and few impurities. Mixing them with the first recycled material obtained from product stripping and recycling improves resource utilization, reduces waste during production, and lowers environmental pollution. By mixing these two types of recycled materials, the performance of the polyol recycled material can be improved, ensuring the stability and activity of the final foam.

[0058] In some embodiments, the ratio of the first recycled material to the second recycled material is (1~4):1, for example 1:1, 2:2, 3:1, 4:1, or any combination of the above.

[0059] In some embodiments, the scraps generated during the production of polyurethane foam based on petroleum-based polyols can be chemically treated to obtain recycled polyol material. Understandably, these scraps have higher purity and fewer impurities compared to the foam material recovered from product stripping.

[0060] In some embodiments, before chemically treating the recycled polyurethane foam to obtain polyol recycled material, the preparation method further includes:

[0061] The equipment to be recycled is boiled in water to remove the foam material. The boiling solution contains sodium carbonate and surfactant. Sodium carbonate helps dissolve some organic impurities, while surfactant helps remove impurities and grease from the foam.

[0062] The exfoliated foam material is crushed to a preset size and then screened through a density sorting tank. The floating material is collected as recycled polyurethane foam material. The density of the material in the density sorting tank is 1.1-1.2 g / cm³. 3 Density screening can effectively screen out polyurethane foam materials that meet the requirements.

[0063] The polyurethane foam recycling method proposed in this application can reduce carbon emissions and environmental pollution caused by incineration compared to traditional incineration methods, while also reducing the use of petroleum-based raw materials.

[0064] In some embodiments, polyurethane foam recovered from the recycling facility can be chemically treated to obtain recycled polyol material. Compared to recycled polyol material prepared from scrap materials, the recycled polyol material prepared in this way has lower purity and more impurities.

[0065] This application also provides a polyurethane foam material, which is obtained by the above-described preparation method for polyurethane foam materials.

[0066] This application also provides a steering wheel, wherein the foaming material used in the steering wheel is prepared by any of the above-described methods for preparing polyurethane foaming materials.

[0067] This application also provides a method for injection molding a steering wheel, wherein the premixed material and isocyanate from any of the above-mentioned methods for preparing polyurethane foam material are injected into a steering wheel mold through a high-pressure mixing injection molding process to form a foam.

[0068] Specifically, the premix and isocyanate are stored separately in temperature-controlled tanks. A high-pressure foaming machine then propels the two components together at high speed through a mixing head, causing them to collide. The mixture is injected into a preheated mold containing a pre-placed steering wheel metal frame. Inside the mold, the mixture rapidly undergoes polymerization and foaming reactions. After molding, it is demolded, and the surface can be trimmed, cleaned, coated, baked, cured, and coated with a surface coating to obtain the final steering wheel.

[0069] This application also provides an in-vehicle component, wherein the foaming material used in the in-vehicle component is prepared by the above-described method for preparing polyurethane foam. The in-vehicle component includes, but is not limited to: dashboard, door panel, sub-dashboard, armrest, carpet, headliner, etc.

[0070] The present invention will be further described below using a discarded steering wheel as an example, with specific embodiments.

[0071] Figure 2 A flowchart illustrating the foam dismantling method for used steering wheels, as shown below. Figure 2 As shown. After peeling off the outer skin and removing the switch trim from the used steering wheel, the steering wheel is placed in a boiling kettle and boiled. The base solution is water. The boiling time for a regular steering wheel is 45 to 60 minutes, and for a steering wheel with a heating function, it is 70 to 90 minutes, at a temperature of 85-95℃. Additives are then added to remove residual glue and improve the purity of the recycled foam. The types of additives include degumming cleaners, such as IPA cleaner, sodium carbonate, sodium silicate, propylene glycol methyl ether acetate (PMA) solvent, etc.; and surfactants, including sodium dodecyl sulfate and Triton X-100.

[0072] Figure 3 This is a flowchart illustrating the crushing and purification process of foamed materials, as shown below. Figure 3 As shown, the foam obtained in the previous step is broken into 3-5cm pieces using a low-speed shredder. 3 The fragments are then placed in a density sorting tank. The tank solution consists of water and sodium chloride, and the saline concentration is adjusted to 1.1-1.2 g / cm³. 3 This makes the foamed material (density 0.03-0.3 g / cm³) 3 The material floats to the surface. The floating material is collected and proceeds to the next step, while the sinking material re-enters a low-speed shredder to break the foamed material to 1-2cm. 3 Fragment repeatability density screening process.

[0073] The purified recycled material obtained in the previous step is then fed into a chemical recycling process. Under specific temperature and pressure conditions, an alcoholysis agent is used to decompose the polyurethane foam material. Through distillation, filtration, and purification, high-purity polyols with a functionality of 3 are recovered. The recycled material undergoes performance testing to ensure that its viscosity, reactivity, and other indicators meet the foaming requirements, yielding a polyol raw material suitable for steering wheel production, referred to as polyol PCR recycled material (i.e., first polyol recycled material).

[0074] The foaming process in automotive steering wheel production generates scrap materials, which are traditionally incinerated. Now, these scrap materials are being recycled directly from automotive parts manufacturing plants and transformed into polyol raw materials for steering wheel production. This is called polyol PIR recycled material (i.e., second polyol recycled material). Because of its single source of raw materials and the absence of pollution during transportation and production, polyol recycled PIR material has higher purity and requires no disassembly, screening, or purification processes, resulting in lower costs.

[0075] The above-mentioned recycled polyol PIR and PCR materials can replace a portion of the petroleum-based polyols, with a replacement ratio of 5% to 30% by weight. The recycled material can be blended with petroleum-based material A at a mass ratio of 7:3 (or 8:2, or 9:1), and the amounts of catalyst and silicone oil stabilizer can be adjusted to improve the activity of the mixture and control the cell morphology. The catalyst dosage is 0.5-3 php (php refers to the number of parts added per 100 parts of polyol), and the catalyst type is a combination of amine and metal catalysts. To compensate for the consumption of amines by residual hydrolysates in the recycled material, the amount of amine catalyst can be appropriately increased. Tin catalysts are poisoned by residual flame retardants in the recycled material, so the amount of tin catalyst can be appropriately reduced. The ratio of amine catalyst to tin catalyst is (2.5~4):1 (molar ratio). The foaming stabilizer is siloxane-modified silicone oil.

[0076] If the moisture content in the recycled material exceeds the requirement (i.e., excessive foaming agent), the amount of water added to the formula needs to be adjusted. The correction can be made as follows: Corrected water content = (Number of water added in the standard formula) - (Moisture content of recycled material) × (Number of recycled material). Finally, other additives are added to form premix A.

[0077] PCR and PIR materials can be mixed and used to replace material A. The mixing ratio can be any combination of PIR and PCR materials. However, PCR materials form a complete closed-loop recycling system for the automotive industry, while PIR materials are less expensive and have a slightly better odor. Therefore, the recommended ratio of PCR to PIR materials is 8:2, 7:3, 6:4, or 5.

[0078] The required amount of isocyanate is calculated based on the hydroxyl value of the polyol, and the NCO / OH ratio is controlled to be approximately 1.0-1.12. NCO / OH is a core parameter of the polyurethane reaction, representing the molar ratio of isocyanate groups (-NCO) to hydroxyl groups (-OH).

[0079] The mechanical properties of different proportions of recycled polyols were tested below.

[0080] Example 1

[0081] The formula for polyurethane foam is as follows: 5g recycled polyol (5%), 95g petroleum-based polyol (95%), 1g water, 49g isocyanate, 0.37g NE300 amine catalyst, 0.13g organotin catalyst T9, and 0.5g Momentive L-580 stabilizer.

[0082] Example 2

[0083] The difference from Example 1 is that the formulation contains: 10g of recycled polyol (10%) and 90g of petroleum-based polyol (90%).

[0084] Example 3

[0085] The difference from Example 1 is that the formulation contains: 20g of recycled polyol (20%) and 80g of petroleum-based polyol (80%).

[0086] Example 4

[0087] The difference from Example 1 is that the formulation contains: 30g of recycled polyol (30%) and 70g of petroleum-based polyol (70%).

[0088] Example 5

[0089] The difference from Example 1 is that the formulation contains: 0.1764 g of organotin catalyst T9.

[0090] Example 6

[0091] The difference from Example 1 is that the formulation contains: 1.92g of NE300 amine catalyst and 0.76g of organotin catalyst T9.

[0092] Example 7

[0093] The difference from Example 1 is that the formulation contains: 1.2g of NE300 amine catalyst and 0.475g of organotin catalyst T9.

[0094] Example 8

[0095] The difference from Example 1 is that the formula uses 1.0g of stabilizer per 100 parts of polyol recycled material.

[0096] Comparative Example 1

[0097] The difference from Example 1 is that the formulation contains: 0g of recycled polyol (0%) and 100g of petroleum-based polyol (100%).

[0098] Comparative Example 2

[0099] The difference from Example 1 is that the formulation contains: 40g of recycled polyol (40%) and 60g of petroleum-based polyol (60%).

[0100] Test case

[0101] The products of each embodiment and comparative example were subjected to performance testing under standard test conditions (23±2℃, 50%±5%RH), followed by a 7-day accelerated aging test at 140℃, and then further performance testing. Detailed performance test results are shown in Tables 1 and 2.

[0102] Table 1. Mechanical properties of recycled polyols

[0103]

[0104] The above tests and verifications show that, compared with 100% petroleum-based polyols, the performance of polyurethane foam materials does not decrease significantly when the replacement ratio of petroleum-based polyols is within 30%.

[0105] Table 2. Mechanical property tests of each embodiment and comparative example under normal temperature and pressure.

[0106]

[0107] Nitrogen covering devices are installed in the storage tanks A / B for polyol premixes and isocyanate raw materials.

[0108] During steering wheel production, liquid raw materials are injected into a mold using a high-pressure mixed injection molding process for foaming and molding. The injection pressure is 210-240 bar, the holding time is 60-70 seconds, the mold temperature is adjusted to 60-75℃, and a silicone-based mold release agent is used. The closed-loop recycled foamed steering wheel produced by this process meets the requirements in terms of appearance and test verification.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a polyurethane foam material, characterized in that, The preparation method includes: The recycled polyurethane foam is chemically treated to obtain polyol recycled material; The recycled polyol, petroleum-based polyol, catalyst, foaming agent, and foaming stabilizer are mixed to obtain a premix; wherein the recycled polyol accounts for 5% to 30% of the mass of the alcohol raw materials. The premix is ​​mixed with isocyanate to prepare a new polyurethane foam; wherein the molar ratio of the isocyanate to the hydroxyl groups of the polyol in the premix is ​​(1.0-1.12):

1.

2. The preparation method according to claim 1, characterized in that, The catalyst is a metal catalyst or an amine catalyst, and the metal catalyst includes one or more of tin catalysts, bismuth catalysts, zinc catalysts, and zirconium catalysts.

3. The preparation method according to claim 2, characterized in that, The molar ratio of the amine catalyst to the metal catalyst is (2.5~4):

1.

4. The preparation method according to any one of claims 1-3, characterized in that, The mass fraction of the catalyst used per 100 parts of the aforementioned polyol recycled material is 0.5 to 3 parts.

5. The preparation method according to any one of claims 1-3, characterized in that, The mass fraction of the foaming stabilizer used per 100 parts of the aforementioned polyol recycled material is 0.5-1.5 parts.

6. The preparation method according to any one of claims 1-3, characterized in that, The recovered polyurethane foam material is chemically treated to obtain recycled polyol material, including: The polyurethane foam material recovered from the recycling equipment is chemically treated to obtain the first recycled material; The scraps generated during the production of polyurethane foam based on petroleum-based polyols are chemically treated to obtain a second recycled material. The first recycled material and the second recycled material are mixed to obtain the polyol recycled material.

7. The preparation method according to any one of claims 1-3, characterized in that, The recovered polyurethane foam material is chemically treated to obtain recycled polyol material, including: The scraps generated during the production of polyurethane foam based on petroleum-based polyols are chemically treated to obtain the recycled polyol material.

8. The preparation method according to any one of claims 1-3, characterized in that, The recovered polyurethane foam material is chemically treated to obtain recycled polyol material, including: The polyurethane foam material recovered from the recycling equipment is chemically treated to obtain the polyol recycled material.

9. The preparation method according to claim 6, characterized in that, The ratio of the first recycled material to the second recycled material is (1~4):

1.

10. The preparation method according to claim 6, characterized in that, Before the polyurethane foam material recovered from the recycling equipment is chemically treated to obtain recycled polyol material, the preparation method further includes: The equipment to be recycled is boiled in water to remove the foaming material; the boiling solution is water with added sodium carbonate and surfactant. The stripped foam material is crushed to a preset size and then screened through a density sorting tank. The floating material is collected as the recycled polyurethane foam material, wherein the density of the density sorting tank is 1.1-1.2 g / cm³. 3 .

11. A polyurethane foam material, characterized in that, The polyurethane foam material is obtained by the preparation method of polyurethane foam material according to any one of claims 1-10.

12. A steering wheel, characterized in that, The foaming material used in the steering wheel is prepared by the method for preparing polyurethane foaming material according to any one of claims 1-10.

13. A method for injection molding a steering wheel, characterized in that, The premix and isocyanate in the preparation method of polyurethane foam material according to any one of claims 1-10 are injected into a steering wheel mold by high-pressure mixing injection molding process to form foam.

14. A vehicle-mounted component, characterized in that, The foaming material used in the vehicle-mounted components is prepared by the polyurethane foaming material preparation method according to any one of claims 1-10.

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