A double density sponge cushion and a method of making the same

Abstract

This application relates to the technical field of sponge seat cushions, and in particular to a dual-density sponge seat cushion and its preparation method; this application discloses a dual-density sponge seat cushion, including a first sponge layer and a second sponge layer, wherein the second sponge layer is disposed below the first sponge layer, and the density of the first sponge layer is 32-35 kg / m³. 2 The density of the second sponge layer is 60-70 kg / m³. 2 The first sponge layer comprises the following raw materials in parts by weight: 60-70 parts polyether polyol, 55-65 parts isocyanate, 1-3 parts catalyst, 1-4 parts foaming agent, 2-5 parts crosslinking agent, 1-2 parts stabilizer, 0.5-3 parts silicon carbide, 3-8 parts aramid fiber, 15-20 parts polyethylene, and 0.5-3 parts coupling agent. This application discloses a dual-density sponge cushion and its preparation method. By using two sponge materials of different densities to prepare a dual-density sponge cushion, the comfort of passengers is improved while ensuring the support of the sponge cushion.

Description

Technical Field

[0001] This application relates to the technical field of sponge seat cushions, and in particular to a dual-density sponge seat cushion and its preparation method. Background Technology

[0002] As the part of a car that has the most contact between a person and the vehicle, the comfort of the car seat has a significant impact on the overall driving and riding experience. A well-designed car seat should ensure that it can reasonably support the weight of different parts of the body. In areas where pressure is concentrated, the shape of the contact surface should be changed to increase the pressure-bearing area and distribute the force, thereby minimizing the driver's muscle fatigue and ensuring the driver's health and driving safety.

[0003] Ride comfort has become an increasingly important aspect of automotive design. Improving and refining car seat design to enhance ride comfort and optimize the user experience for passengers has become one of the urgent issues that the current automotive human-centered design and even the automotive industry development must address. Most bus seats on the market use foam cushions that are integrally foamed, meaning the density of the foam cushion is the same throughout, resulting in poor passenger comfort.

[0004] Therefore, how to improve passenger comfort while ensuring the support of the foam seat cushion has become an urgent problem to be solved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a dual-density sponge cushion and its preparation method.

[0006] In a first aspect, this application provides a dual-density sponge seat cushion, which adopts the following technical solution: A dual-density foam seat cushion includes a first foam layer and a second foam layer, wherein the second foam layer is disposed below the first foam layer, and the density of the first foam layer is 32-35 kg / m³. 2 The density of the second sponge layer is 60-70 kg / m³. 2 The first sponge layer comprises the following raw materials in parts by weight: 60-70 parts of polyether polyol, 55-65 parts of isocyanate, 1-3 parts of catalyst, 1-4 parts of foaming agent, 2-5 parts of crosslinking agent, 1-2 parts of stabilizer, 0.5-3 parts of silicon carbide, 3-8 parts of aramid fiber, 15-20 parts of polyethylene, and 0.5-3 parts of coupling agent.

[0007] This application incorporates a dual-density sponge cushion located between the headrest and seat cushion, where the seat contacts the human body. This dual-density sponge cushion is manufactured using dual-density foaming technology, a technique that utilizes sponge materials of different densities to design a seat. The sponge material used on the seat surface (the first sponge layer) has a lower density, providing a softer touch and increasing seat comfort. The sponge material used inside the seat (the second sponge layer) has a higher density, providing better support and stability, allowing the seat to better support the occupant's body during driving.

[0008] In order to ensure the softness of the first sponge layer while improving its support strength and toughness, this application improves the raw materials of the first sponge layer by adding silicon carbide, aramid fiber, and polyethylene. The added silicon carbide, aramid fiber, and polyethylene are used as a coupling agent to prepare a mixture with certain toughness and support strength. The prepared mixture is then uniformly mixed with other raw materials to obtain a first sponge layer with certain softness and support strength.

[0009] Preferably, the second sponge layer comprises the following raw materials in parts by weight: 70-100 parts of polyether polyol, 35-55 parts of isocyanate, 1-3 parts of catalyst, 1-4 parts of foaming agent, 2-5 parts of crosslinking agent, 1-2 parts of stabilizer, 0.5-3 parts of carbon fiber, 3-8 parts of epoxy resin, and 0.5-3 parts of coupling agent.

[0010] By adopting the above technical solution, this application improves the raw materials of the second sponge layer by adding carbon fiber, epoxy resin and coupling agent. The added carbon fiber and epoxy resin are used to prepare a mixture with certain toughness and support strength under the action of coupling agent. The prepared mixture is uniformly mixed with other raw materials to obtain a second sponge layer with certain toughness and support strength.

[0011] Preferably, the polyether polyol is at least one of TEP-330N, FA-703, and GEP-330N.

[0012] Preferably, the isocyanate is MDI2412.

[0013] Preferably, the catalyst is at least one of DABCO 33LV, DABCO BL 11 or Jeffcat ZF-10.

[0014] Preferably, the foaming agent is at least one of HCFC-141b, HFC-365mfc, or dichloromethane.

[0015] Preferably, the crosslinking agent is at least one of diethanolamine and triethanolamine.

[0016] Preferably, the stabilizer is silicone oil.

[0017] Preferably, the coupling agent is coupling agent K550.

[0018] Secondly, this application provides a method for preparing a dual-density sponge cushion, employing the following technical solution: A method for preparing a dual-density sponge seat cushion, comprising the following steps: Step 1: Preparation of the first sponge layer liquid: (1) Weigh out each ingredient according to the formula; (2) Mix silicon carbide, coupling agent and anhydrous ethanol, add aramid fiber and polyethylene and mix, ball mill and spray dry to obtain silicon carbide-fiber composite powder. (3) Mix polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and water in a mixing tank, add silicon carbide-fiber composite powder and mix to obtain the first sponge layer liquid. Step 2, Preparation of the second sponge layer liquid: (1) Weigh out each ingredient according to the formula; (2) Mix carbon fiber, coupling agent and anhydrous ethanol, add epoxy resin and mix, then add polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and water and mix to obtain the second sponge layer liquid. Step 3: First, pour the first sponge layer liquid into the corresponding area of ​​the mold, then pour the second sponge layer liquid into the corresponding area of ​​the mold. After pouring, keep it warm and pressurized to form and demold. After opening the bubbles, the product is obtained.

[0019] By adopting the above technical solution, this application uses a sequential pouring method to pour the first sponge layer liquid and the second sponge layer liquid into different areas of the mold, thereby realizing the preparation of a dual-density sponge cushion. This preparation method is simple, easy to operate, low in cost, and suitable for widespread application.

[0020] In summary, this application includes at least one of the following beneficial technical effects: This application discloses a dual-density sponge seat cushion and its preparation method. By using two sponge materials of different densities to prepare the dual-density sponge seat cushion, the comfort of passengers is improved while ensuring the support of the sponge seat cushion. Detailed Implementation

[0021] The technical solutions of this application are further illustrated by specific embodiments below. These specific embodiments do not represent a limitation on the scope of protection of this application. Any non-essential modifications and adjustments made by others based on the concept of this application still fall within the scope of protection of this application.

[0022] All raw materials involved in this application are commercially available products, among which, The polyether polyol is at least one of TEP-330N (Tianjin Petrochemical Co., Ltd.), FA-703 (Kelia Polyol (Nanjing) Co., Ltd.), and GEP-330N (Shanghai Gaoqiao Petrochemical Co., Ltd.).

[0023] The catalyst is at least one of DABCO 33LV (Evonik), DABCO BL 11 (Evonik), or Jeffcat ZF-10 (Huntsman).

[0024] The foaming agent is at least one of HCFC-141b (Zhejiang Sanmei), HFC-365mfc (Solvay), or dichloromethane (Jiangsu Meilan Chemical).

[0025] The stabilizer is silicone oil stabilizer L-3151 (Momentive Advanced Materials Co., Ltd.).

[0026] Silicon carbide powder, 300 mesh, purchased from Henan Qingquan Environmental Protection Technology Co., Ltd.

[0027] Aramid fiber, density 1.42 g / cm³ 3 Purchased from Jiangxi Shuobang New Materials Technology Co., Ltd.

[0028] Polyethylene, purchased from Kunshan Jinkaiwo Plastics Co., Ltd.

[0029] Carbon fiber was purchased from Jiangxi Shuobang New Material Technology Co., Ltd.

[0030] Epoxy resin, purchased from Shanghai Tikham Industrial Co., Ltd.

[0031] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0032] Example 1: A dual-density foam seat cushion includes a first foam layer and a second foam layer, wherein the second foam layer is disposed below the first foam layer, and the density of the first foam layer is 33 kg / m³. 2 The density of the second sponge layer is 65 kg / m³. 2 The first sponge layer comprises the following raw materials: 65 kg of polyether polyol, 60 kg of isocyanate, 2 kg of catalyst, 2.5 kg of foaming agent, 3.5 kg of crosslinking agent, 1.5 kg of stabilizer, 2 kg of silicon carbide, 5 kg of aramid fiber, 17 kg of polyethylene, and 2 kg of coupling agent.

[0033] The second sponge layer comprises the following raw materials: 85 kg of polyether polyol, 45 kg of isocyanate, 2 kg of catalyst, 2.5 kg of foaming agent, 3.5 kg of crosslinking agent, 1.5 kg of stabilizer, 2 kg of carbon fiber, 5 kg of epoxy resin, and 2 kg of coupling agent.

[0034] The polyether polyol is polyether polyol TEP-330N (Tianjin Petrochemical Co., Ltd.); The isocyanate is MDI2412.

[0035] The catalyst is DABCO 33LV (Evonik).

[0036] The foaming agent is HCFC-141b (Zhejiang Sanmei).

[0037] The crosslinking agent is diethanolamine.

[0038] The stabilizer is silicone oil stabilizer L-3151 (Momentive Advanced Materials Co., Ltd.).

[0039] The coupling agent is coupling agent K550.

[0040] A method for preparing a dual-density sponge seat cushion, comprising the following steps: Step 1, Preparation of the first sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix silicon carbide, coupling agent and 18 kg of anhydrous ethanol, add aramid fiber and polyethylene and mix, ball mill for 5 hours, spray dry to obtain silicon carbide-fiber composite powder. (3) Mix polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water in a mixing tank, add silicon carbide-fiber composite powder and mix to obtain the first sponge layer liquid. Step 2, Preparation of the second sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix carbon fiber, coupling agent, and 18 kg of anhydrous ethanol, add epoxy resin and mix, add polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water and mix to obtain the second sponge layer liquid. Step 3: Take the mold and spray the release agent. Use an ABB robotic casting machine and KraussMaffei control system to cast the mold. First, pour the first sponge layer liquid into the corresponding area of ​​the mold, and then pour the second sponge layer liquid into the corresponding area of ​​the mold. After casting, keep it at 40℃ and 0.6MPa for 5 minutes to form and demold, and obtain the molded product. The demolded product is then processed by a foaming machine, specifically by compressing 90% of the volume of the product and expelling the waste gas. Then, let it air dry for 3 days to obtain the final product.

[0041] Example 2: A dual-density foam seat cushion includes a first foam layer and a second foam layer, wherein the second foam layer is disposed below the first foam layer, and the density of the first foam layer is 32 kg / m³. 2 The density of the second sponge layer is 60 kg / m³. 2 The first sponge layer comprises the following raw materials: 60 kg of polyether polyol, 55 kg of isocyanate, 1 kg of catalyst, 1 kg of foaming agent, 2 kg of crosslinking agent, 1 kg of stabilizer, 0.5 kg of silicon carbide, 3 kg of aramid fiber, 15 kg of polyethylene, and 0.5 kg of coupling agent.

[0042] The second sponge layer comprises the following raw materials: 70 kg of polyether polyol, 35 kg of isocyanate, 1 kg of catalyst, 1 kg of foaming agent, 2 kg of crosslinking agent, 1 kg of stabilizer, 0.5 kg of carbon fiber, 3 kg of epoxy resin, and 0.5 kg of coupling agent.

[0043] The polyether polyol is polyether polyol TEP-330N (Tianjin Petrochemical Co., Ltd.); The isocyanate is MDI2412.

[0044] The catalyst is DABCO 33LV (Evonik).

[0045] The foaming agent is HCFC-141b (Zhejiang Sanmei).

[0046] The crosslinking agent is diethanolamine.

[0047] The stabilizer is silicone oil stabilizer L-3151 (Momentive Advanced Materials Co., Ltd.).

[0048] The coupling agent is coupling agent K550.

[0049] A method for preparing a dual-density sponge seat cushion, comprising the following steps: Step 1, Preparation of the first sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix silicon carbide, coupling agent and 18 kg of anhydrous ethanol, add aramid fiber and polyethylene and mix, ball mill for 5 hours, spray dry to obtain silicon carbide-fiber composite powder. (3) Mix polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water in a mixing tank, add silicon carbide-fiber composite powder and mix to obtain the first sponge layer liquid. Step 2, Preparation of the second sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix carbon fiber, coupling agent, and 18 kg of anhydrous ethanol, add epoxy resin and mix, then add polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water and mix to obtain the second sponge layer liquid. Step 3: Take the mold and spray the release agent. Use an ABB robotic casting machine and KraussMaffei control system to cast the mold. First, pour the first sponge layer liquid into the corresponding area of ​​the mold, and then pour the second sponge layer liquid into the corresponding area of ​​the mold. After casting, keep it at 40℃ and 0.6MPa for 5 minutes to form and demold, and obtain the molded product. The demolded product is then processed by a foaming machine, specifically by compressing 90% of the volume of the product and expelling the waste gas. Then, let it air dry for 3 days to obtain the final product.

[0050] Example 3: A dual-density foam seat cushion includes a first foam layer and a second foam layer, wherein the second foam layer is disposed below the first foam layer, and the density of the first foam layer is 35 kg / m³. 2 The density of the second sponge layer is 70 kg / m³. 2 The first sponge layer comprises the following raw materials: 70 kg of polyether polyol, 65 kg of isocyanate, 3 kg of catalyst, 4 kg of foaming agent, 5 kg of crosslinking agent, 2 kg of stabilizer, 3 kg of silicon carbide, 8 kg of aramid fiber, 20 kg of polyethylene, and 3 kg of coupling agent.

[0051] The second sponge layer comprises the following raw materials: 100 kg of polyether polyol, 55 kg of isocyanate, 3 kg of catalyst, 4 kg of foaming agent, 5 kg of crosslinking agent, 2 kg of stabilizer, 3 kg of carbon fiber, 8 kg of epoxy resin, and 3 kg of coupling agent.

[0052] The polyether polyol is polyether polyol TEP-330N (Tianjin Petrochemical Co., Ltd.); The isocyanate is MDI2412.

[0053] The catalyst is DABCO 33LV (Evonik).

[0054] The foaming agent is HCFC-141b (Zhejiang Sanmei).

[0055] The crosslinking agent is diethanolamine.

[0056] The stabilizer is silicone oil stabilizer L-3151 (Momentive Advanced Materials Co., Ltd.).

[0057] The coupling agent is coupling agent K550.

[0058] A method for preparing a dual-density sponge seat cushion, comprising the following steps: Step 1, Preparation of the first sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix silicon carbide, coupling agent and 18 kg of anhydrous ethanol, add aramid fiber and polyethylene and mix, ball mill for 5 hours, spray dry to obtain silicon carbide-fiber composite powder. (3) Mix polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water in a mixing tank, and then add silicon carbide-fiber composite powder to mix to obtain the first sponge layer liquid. Step 2, Preparation of the second sponge layer: (1) Weigh out each ingredient according to the formula; (2) Mix carbon fiber, coupling agent, and 18 kg of anhydrous ethanol, add epoxy resin and mix, then add polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent, stabilizer and 30 kg of water and mix to obtain the second sponge layer liquid. Step 3: Take the mold and spray the release agent. Use an ABB robotic casting machine and KraussMaffei control system to cast the mold. First, pour the first sponge layer liquid into the corresponding area of ​​the mold, and then pour the second sponge layer liquid into the corresponding area of ​​the mold. After casting, keep it at 40℃ and 0.6MPa for 5 minutes to form and demold, and obtain the molded product. The demolded product is then processed by a foaming machine, specifically by compressing 90% of the volume of the product and expelling the waste gas. Then, let it air dry for 3 days to obtain the final product.

[0059] Example 4: The difference from Example 1 is that the amount of silicon carbide added during the preparation of the first sponge layer is 0.5 kg.

[0060] Example 5: The difference from Example 1 is that 3 kg of silicon carbide was added during the preparation of the first sponge layer.

[0061] Example 6: The difference from Example 1 is that 3 kg of aramid fiber was added during the preparation of the first sponge layer.

[0062] Example 7: The difference from Example 1 is that 8 kg of aramid fiber was added during the preparation of the first sponge layer.

[0063] Example 8: The difference from Example 1 is that the amount of carbon fiber added during the preparation of the second sponge layer is 0.5 kg.

[0064] Example 9: The difference from Example 1 is that the amount of carbon fiber added during the preparation of the second sponge layer is 3 kg.

[0065] Comparative Example 1: The difference from Example 1 is that silicon carbide is not added during the preparation of the first sponge layer.

[0066] Comparative Example 2: The difference from Example 1 is that no aramid fibers are added during the preparation of the first sponge layer.

[0067] Comparative Example 3: The difference from Example 1 is that the raw material of the first sponge layer is different.

[0068] The first sponge layer comprises the following raw materials: 65 kg of polyether polyol, 60 kg of isocyanate, 2 kg of catalyst, 2.5 kg of foaming agent, 3.5 kg of crosslinking agent, and 1.5 kg of stabilizer.

[0069] Comparative Example 4: The difference from Example 1 is that no carbon fiber is added during the preparation of the second sponge layer.

[0070] Comparative Example 5: The difference from Example 1 is that the material of the second sponge layer is different.

[0071] The second sponge layer comprises the following raw materials: 85 kg of polyether polyol, 45 kg of isocyanate, 2 kg of catalyst, 2.5 kg of foaming agent, 3.5 kg of crosslinking agent, and 1.5 kg of stabilizer.

[0072] Comparative Example 6: The difference from Example 1 is that 2 kg of aramid fiber was added during the preparation of the first sponge layer.

[0073] Comparative Example 7: The difference from Example 1 is that 9 kg of aramid fiber was added during the preparation of the first sponge layer.

[0074] Comparative Example 8: The difference from Example 1 is that the amount of silicon carbide added during the preparation of the first sponge layer is 0.4 kg.

[0075] Comparative Example 9: The difference from Example 1 is that the amount of silicon carbide added during the preparation of the first sponge layer is 3.1 kg.

[0076] Comparative Example 10: The difference from Example 1 is that the amount of carbon fiber added during the preparation of the second sponge layer is 0.4 kg.

[0077] Comparative Example 11: The difference from Example 1 is that the amount of carbon fiber added during the preparation of the second sponge layer is 3.1 kg.

[0078] Performance testing: The performance of the sponge cushions prepared in the above embodiments and comparative examples was tested, as follows: (1) Tensile property test: The tensile strength and elongation at break of memory foam were tested using a universal tensile testing machine in accordance with GB / T 6634-2008 Determination of tensile strength and elongation at break of flexible foam polymer materials. (2) Support strength test: According to GB / T 6669-2008 Determination of compression permanent deformation of flexible foam insulation materials, the sample size is 50mm×50mm×50mm. A universal testing machine is used, the test displacement loading speed is 0.5mm / min, and the 40% compression hardness of the sample is tested and recorded.

[0079] (3) Rebound time: The rebound time of the sponge was tested using the Foam Resilience Tester, model F0030, in accordance with the "GB / T6670-2008 Sponge Resilience Test Scheme".

[0080] Table 1 Performance Test Results As shown in Table 1, the sponge cushion prepared by the method of this application, while ensuring the softness of the sponge cushion, has significantly improved tensile strength, elongation at break and 40% compression hardness, effectively improving the support strength and toughness of the sponge cushion.

[0081] Based on Example 1 and Comparative Example 1, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Example 1 are better than those of Comparative Example 1. This indicates that the formulation of the first sponge layer in this application has been improved by adding silicon carbide. After the added silicon carbide and aramid fiber react with polyethylene under the action of a coupling agent, they react with other raw materials. This allows the first sponge layer to effectively improve the support strength and toughness of the first sponge layer while ensuring softness.

[0082] Based on Example 1 and Comparative Example 2, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Example 1 are better than those of Comparative Example 2. This indicates that the formulation of the first sponge layer in this application has been improved by adding aramid fiber. The added aramid fiber and silicon carbide react with polyethylene under the action of a coupling agent, and then react with other raw materials. This allows the first sponge layer to effectively improve the support strength and toughness of the first sponge layer while ensuring softness.

[0083] Based on Example 1 and Comparative Example 3, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Example 1 are better than those of Comparative Example 3. This indicates that the formulation of the first sponge layer in this application has been improved by adding aramid fiber, silicon carbide, and polyethylene. The added aramid fiber and silicon carbide react with polyethylene under the action of a coupling agent, and then react with other raw materials. This allows the first sponge layer to effectively improve the support strength and toughness of the first sponge layer while ensuring softness.

[0084] Based on Example 1 and Comparative Example 4, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Example 1 are better than those of Comparative Example 4. This indicates that the formulation of the second sponge layer in this application has been improved by adding carbon fiber. After the added carbon fiber reacts with epoxy resin under the action of coupling agent, it is then uniformly mixed with other raw materials to obtain a second sponge layer with certain support strength and toughness.

[0085] Based on Example 1 and Comparative Example 5, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Example 1 are better than those of Comparative Example 5. This indicates that the formulation of the second sponge layer in this application has been improved by adding carbon fiber and epoxy resin. After the added carbon fiber reacts with the epoxy resin under the action of the coupling agent, it is then uniformly mixed with other raw materials to obtain a second sponge layer with certain support strength and toughness.

[0086] Based on Examples 1, 6, 7, 6, and 7, and Comparative Examples 6 and 7, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Examples 1, 6, and 7 are better than those of Comparative Examples 6 and 7. This indicates that the amount of aramid fiber added during the preparation of the first sponge layer affects the performance of the sponge cushion, and the sponge cushion performs best when the amount of aramid fiber added is 3-8 kg.

[0087] Based on Examples 1, 4, 5, Comparative Examples 8 and 9, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Examples 1, 4, and 5 are better than those of Comparative Examples 8 and 9. This indicates that the amount of silicon carbide added during the preparation of the first sponge layer affects the performance of the sponge cushion, and the sponge cushion performs best when the amount of silicon carbide added is 0.5-3 kg.

[0088] Based on Examples 1, 8, 9, 10, and 11, it can be seen that the tensile strength, elongation at break, 40% compression hardness, and rebound time of Examples 1, 8, and 9 are better than those of Comparative Examples 10 and 11. This indicates that the amount of carbon fiber added during the preparation of the second sponge layer affects the performance of the sponge cushion, and the sponge cushion performs best when the amount of carbon fiber added is 0.5-3 kg.

Claims

1. A dual-density sponge seat cushion, characterized in that: It includes a first sponge layer and a second sponge layer, with the second sponge layer disposed below the first sponge layer. The density of the first sponge layer is 32-35 kg / m³. 3 The density of the second sponge layer is 60-70 kg / m³. 3 ; The first sponge layer comprises the following raw materials in parts by weight: 60-70 parts of polyether polyol, 55-65 parts of isocyanate, 1-3 parts of catalyst, 1-4 parts of foaming agent, 2-5 parts of crosslinking agent, 1-2 parts of stabilizer, 0.5-3 parts of silicon carbide, 3-8 parts of aramid fiber, 15-20 parts of polyethylene, and 0.5-3 parts of coupling agent; The second sponge layer comprises the following raw materials in parts by weight: 70-100 parts of polyether polyol, 35-55 parts of isocyanate, 1-3 parts of catalyst, 1-4 parts of foaming agent, 2-5 parts of crosslinking agent, 1-2 parts of stabilizer, 0.5-3 parts of carbon fiber, 3-8 parts of epoxy resin, and 0.5-3 parts of coupling agent.

2. The dual-density sponge cushion according to claim 1, characterized in that: The polyether polyol is at least one of TEP-330N, FA-703, and GEP-330N.

3. The dual-density sponge cushion according to claim 1, characterized in that: The isocyanate is MDI2412.

4. The dual-density sponge cushion according to claim 1, characterized in that: The catalyst is at least one of DABCO33LV, DABCO BL 11, or Jeffcat ZF-10.

5. A dual-density sponge cushion according to claim 1, characterized in that: The foaming agent is at least one of HCFC-141b, HFC-365mfc, or dichloromethane.

6. A dual-density sponge cushion according to claim 1, characterized in that: The crosslinking agent is at least one of diethanolamine and triethanolamine.

7. A dual-density sponge cushion according to claim 1, characterized in that: The stabilizer is silicone oil stabilizer L-3151.

8. A dual-density sponge cushion according to claim 1, characterized in that: The coupling agent is coupling agent K550.

9. A method for preparing a dual-density sponge cushion according to any one of claims 1-8, characterized in that, The steps are as follows: Step 1: Preparation of the first sponge layer liquid: (1) Weigh each ingredient according to the formula; (2) Mix silicon carbide and coupling agent, then add aramid fiber and polyethylene for mixing, ball mill and spray dry to obtain silicon carbide-fiber composite powder; (3) Mix polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent and stabilizer, and add silicon carbide-fiber composite powder to obtain the first sponge layer liquid; Step 2, Preparation of the second sponge layer liquid: (1) Weigh each ingredient according to the formula; (2) Mix carbon fiber and coupling agent, add epoxy resin and mix, then add polyether polyol, isocyanate, catalyst, foaming agent, crosslinking agent and stabilizer and mix to obtain the second sponge layer liquid. Step 3: First, pour the first sponge layer liquid into the corresponding area of ​​the mold, then pour the second sponge layer liquid into the corresponding area of ​​the mold. After pouring, keep it warm and pressurized to form and demold. After opening the bubbles, the product is obtained.

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