Comfortable combined sponge for automobile seat and production method thereof

Abstract

The invention relates to the technical field of polyurethane, in particular to a comfortable combined sponge for an automobile seat and a production method of the comfortable combined sponge, and the comfortable combined sponge is obtained by compounding a latex-like viscoelastic comfortable sponge and a common quick-rebound sponge through glue; the invention discloses a slow-rebound and fast-rebound combined comfortable sponge with a novel formula, namely a special latex-like viscoelastic sponge is combined with a traditional common fast-rebound soft foam sponge to manufacture the comfortable sponge for an automobile seat, and solves the problems that the common soft foam sponge is singly used in seat foam, the comfort is insufficient, the wrapping property of the seat is not strong, the cost is low, and the like. Fatigue is generated after long-time driving, the compression of the buttocks in contact with the surface of the seat is improved, and the comfort is reduced.

Description

Technical Field

[0001] This invention relates to the field of polyurethane technology, specifically to a comfort composite foam for automobile seats and its production method. Background Technology

[0002] To address the discomfort caused by vehicle vibrations, a layer of comfort foam is attached to the surface of car seats during the design process to alleviate fatigue and provide passengers with superior comfort.

[0003] Currently, most car seat comfort layer foams on the market use ordinary soft foam. While ordinary soft foam provides some initial comfort, its high resilience (generally above 50%) means that during driving, the seat surface experiences a certain degree of rebound force when subjected to bumps and vibrations. This rebound force, over time, can exert pressure on the contact surface, leading to fatigue and significantly reduced comfort.

[0004] Based on this, the present invention provides a comfort composite sponge for automobile seats and a method for producing the same to solve the corresponding technical problems. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a comfort composite sponge for automobile seats and a method for producing the same.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A comfort composite foam for car seats is obtained by bonding latex-like viscoelastic comfort foam with ordinary fast-rebound foam using an adhesive. The latex-like viscoelastic comfort sponge is prepared from a combination of polyether, a combination of isocyanate and additives in a mass ratio of 100:(35-45):(8-10); by weight, the combination of polyether comprises 80-90 parts of polyether polyol composition, 7-10 parts of flame retardant, 2-4 parts of cell opener, 2-4 parts of chain extender, and 1-2 parts of catalyst. The additives include water, silicone oil, and reactive color paste.

[0007] As a further technical solution, the polyether polyol composition is composed of high molecular weight polyether polyol CHE-628, polyether polyol 330N and slow rebound polyether 7321, with a mass ratio of 5:3:2.

[0008] As a further technical solution, the flame retardant is a halogen-free phosphate flame retardant, the pore-opening agent is CHK-350A, and the chain extender is glycerol.

[0009] As a further technical solution, the catalyst is Z131 and the silicone oil is B4900.

[0010] 5. The comfort composite sponge for automobile seats as described in claim 1, wherein the composite isocyanate is one or more of toluene diisocyanate, diphenyl dimethyl isocyanate, and modified isocyanate.

[0011] As a further technical solution, the combined polyether: combined isocyanate: water: catalyst: silicone oil: reactive pigment is 100: (35-45): (1.5-1.9): (1-2): (1-3): (3-5).

[0012] As a further technical solution, the ordinary fast rebound sponge is model HR50 with a density of 50 kg / m³. 3 The thickness of the latex-like viscoelastic comfort sponge is 10-20mm, while the thickness of ordinary fast-rebound sponge is 15-30mm.

[0013] As a further technical solution, the latex-like viscoelastic comfort sponge has a foam structure and a density of 58-68 kg / m³. 3 The rebound rate is 31%-33%.

[0014] A method for producing a comfort composite foam for automobile seats includes the following steps: (1) Preparation of polyether combination: At room temperature and pressure, add the polyether polyol composition, flame retardant, cell opener and chain extender to the mixing tank according to the ratio, stir for 1-2 hours and then adjust the temperature to 23-25℃ through a hot and cold circulation machine; (2) Preparation of combined isocyanate: Under normal temperature and pressure, add the combined isocyanate to the stirred tank according to the ratio, stir for 0.5-1 hour, and then adjust the temperature to 23-25℃ through a hot and cold circulation machine; (3) Preparation of additives: Add water, catalyst, silicone oil and reactive color paste to the corresponding tanks respectively; (4) One-step continuous production: The above materials are accurately measured by a precision metering pump, transported to the mixing system for full mixing, and continuously poured onto the paper mold. After being conveyed by a conveyor belt, reacted and shaped, and cut, the block material is transported to the curing site for curing for more than 48 hours. Then it is sliced ​​according to specifications to obtain a latex-like viscoelastic comfort sponge. (5) Composite: The latex-like viscoelastic comfort sponge is composited with ordinary fast rebound sponge using PUR adhesive to obtain the final product.

[0015] As a further technical solution, the novel formula of slow rebound and fast rebound combined seat comfort sponge prepared by the method also includes being cut into seat cushion specifications and applied to the comfort layer of automobile seats.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a novel formula for a combination of slow-rebound and fast-rebound comfort foam, which combines a specially made latex-like viscoelastic foam with a traditional fast-rebound soft foam to create a comfortable foam for car seats. This invention solves the problems of insufficient comfort, poor seat support, fatigue during long-term driving, increased pressure on the buttocks in contact with the seat surface, and reduced comfort when using ordinary soft foam alone in seat foam.

[0017] The latex-like viscoelastic sponge prepared by this invention not only has certain memory recovery characteristics but also certain rebound characteristics, providing suitable support; and it has low hysteresis loss. When used in combination with ordinary fast rebound sponges in the comfort layer of car seats, it can minimize the impact of frequency vibrations during driving on the human body and provide a more comfortable seat surface feel in the long term.

[0018] The latex-like viscoelastic sponge prepared in this invention can provide personalized support according to the driver's body shape and posture. Its unique material gradually returns to its original shape after the driver sits down, allowing the seat to closely conform to the driver's body. This body-conforming design can effectively reduce fatigue in the lower back and hips while driving, allowing the driver to maintain a comfortable posture during long drives. It also reduces the impact of vehicle vibrations on the driver and provides a more even pressure distribution. Compared to traditional seat cushions, it can better absorb and disperse pressure, reducing driver discomfort, alleviating leg fatigue, and providing a more comfortable driving experience.

[0019] The latex-like viscoelastic sponge prepared in this invention controls the product's rebound rate within a certain range, ensuring the absorption of vibration and pressure on the human body during vehicle operation while avoiding stress concentration and guaranteeing comfort. This is mainly due to the latex-like viscoelastic sponge's certain memory recovery characteristics, giving it unique pressure dispersion and cushioning energy absorption properties compared to ordinary sponges. That is, when the material is subjected to pressure impact, it undergoes both elastic deformation (energy-storing deformation) that satisfies Hooke's Law and a certain degree of plastic deformation (energy-dissipating deformation); in other words, its deformation is an organic combination of these two types of deformation. Plastic deformation dissipates most (over 90% with special formulations) of the impact energy, while the energy stored in the elastically deformed portion allows the memory foam material to return to its pre-compression shape after the external force is removed. This characteristic gives latex-like viscoelastic foam materials the following properties: as impact cushioning materials, they have a strong impact energy absorption capacity while exhibiting minimal rebound force to the pressure-applying object (or human body) in contact with them, ensuring comfort; as materials for seat cushions, they are subjected to pressure close to static pressure. Under this pressure, the molecular structure of the material undergoes "flow" displacement, deforming to conform to the contour of the pressure surface, diffusing the support points to the entire contact surface, thus dispersing the pressure across the entire contact surface. This characteristic is called "uniform pressure dispersion." When a person sits on a cushion made of this material, because the pressure is evenly dispersed, there are no pressure concentration points on the body, greatly improving comfort and providing passengers with superior tactile comfort.

[0020] Instruction manual illustrations Figure 1 The image shows the appearance of the latex viscoelastic comfort sponge of Example 1; Figure 2 Example 2: Appearance diagram of latex viscoelastic comfort sponge; Figure 3 Here is a picture of the sponge's appearance as shown in Comparative Example 1; Figure 4 Here is a picture of the sponge's appearance as shown in Comparative Example 2; Figure 5 Image of a 42.8mm high-resilience sponge; The 42.8mm high-resilience sponge is HR50 from Shenyang Xianzhong Polyurethane Co., Ltd. Figure 6 This is a comparison chart of 25% and 65% hardness values ​​when VLPU foam with different thickness ratios is combined with ordinary fast rebound HR foam. Figure 7 This is a diagram showing the perceived pressure distribution of a typical foam. Figure 8 A diagram showing the perceived pressure distribution of foam in a car seat cushion. Figure 9 This is a diagram showing the perceived pressure distribution of latex viscoelastic foam in Example 1. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0022] This invention discloses a comfort composite sponge for automobile seats and its production method. The composite seat comfort sponge is obtained by bonding a latex-like viscoelastic comfort sponge with a regular fast-rebound sponge. The latex-like viscoelastic comfort sponge is prepared from a combination of polyether, a combination of isocyanate, and additives in a specific mass ratio. The preparation process requires steps such as polyether preparation, isocyanate preparation, additive preparation, one-step continuous production, and compounding. The final product can be cut into seat cushion specifications and applied to the comfort layer of automobile seats. It can evenly distribute pressure, reduce the impact of driving vibration on the human body, and improve seat cushion comfort.

[0023] Raw material description: Polyether polyol 628: Polyether polyol 628 produced by Jiangsu Changhua Technology Co., Ltd. Polyether polyol 330N: Polyether polyol 330N is produced by Jiangsu Changhua Technology Co., Ltd. Polyether polyol 7321: Polyether polyol 7321 produced by Jiahe Chemical Co., Ltd. is used; Flame retardant: PNX, a halogen-free flame retardant produced by Yihua Company, is used; CHK-350A pore opener: CHK-350A pore opener manufactured by Jiangsu Changhua Technology Co., Ltd. Chain extender glycerol: The chain extender glycerol used is produced by Jiahe Chemical Co., Ltd. Toluene diisocyanate: Toluene diisocyanate produced by Wanhua Chemical Co., Ltd. was used. 8610: Uses 8610 produced by Wanhua Chemical Group Co., Ltd.; 8019: 8019 produced by Wanhua Chemical Group Co., Ltd. Catalyst Z131: Catalyst Z131 produced by Huntsman Chemicals; Silicone oil B4900: Silicone oil B4900 manufactured by Evonik Specialty Chemicals (Shanghai) Co., Ltd. is used. Colorant: The colorant used is from Melink Company, model: X41LV. Sponge products made with this colorant have bright colors, stable color, and are environmentally friendly and odorless. Conventional color pastes are generally made by grinding color masterbatch into powder, and then adding a certain amount of polyether and diluent. They are additive-based and have disadvantages such as dull color and poor stability. Adding diluents can easily produce small molecule volatilization, which is not environmentally friendly.

[0024] Ordinary fast rebound sponge: The preferred model is HR50, and the preferred density is 50kg / m³. 3 Commercially available, with a preferred thickness of 15-30mm, it can improve the support of the seat cushion when combined with a latex-like viscoelastic sponge.

[0025] Adhesive: PUR adhesive is preferred for the lamination process. It is commercially available and can achieve a stable bond between latex-like viscoelastic sponge and ordinary fast-rebound sponge.

[0026] Horizontal continuous foaming equipment: The equipment is manufactured by Auster Polyurethane Co., Ltd.

[0027] Production methods include: Preparation of polyether composition: At room temperature and pressure, add the polyether polyol composition, flame retardant, cell opener, chain extender and catalyst to the mixing tank (A material mixing tank) according to the weight parts. The mixing time is preferably 1-2 hours. After the materials are uniformly mixed, adjust the temperature to 23-25℃ through a hot and cold circulation machine to obtain the polyether composition; wherein the polyether polyol composition is preferably 80-90 parts by weight in the polyether composition.

[0028] Preparation of composite isocyanate: At room temperature and pressure, add composite isocyanate to a mixing tank (B material mixing tank) according to the ratio. The mixing time is preferably 0.5-1 hour. After the materials are evenly mixed, adjust the temperature to 23-25℃ through a hot and cold circulation machine to obtain composite isocyanate.

[0029] Additive preparation: Add water, silicone oil B4900, and reactive color paste to the corresponding additive tanks (water tank, silicone oil tank, color paste tank) for later use.

[0030] One-step continuous production: A horizontal continuous semi-high-pressure polyurethane foaming equipment is used. Precision metering pumps accurately measure the combined polyether, combined isocyanate, and additives (water, silicone oil B4900, and reactive colorant). The preferred metering ratio is combined polyether: combined isocyanate: water: catalyst: silicone oil B4900: reactive colorant = 100:(35-45):(1.5-1.9):(1-2):(1-3):(3-5). After metering, all materials are simultaneously transported to a mixing system for thorough mixing. The mixed material is then continuously poured onto a paper mold. The material in the paper mold is transported out via a conveyor belt. After the block material has reacted and solidified, the continuous block material is cut into specific lengths according to requirements. The cut blocks are transported to a curing site by conveyor belt. The curing time is preferably more than 48 hours. After curing, the blocks are sliced ​​according to specifications to obtain a latex-like viscoelastic comfort sponge. This sponge preferably has a porous structure and a density preferably of 58-68 kg / m³. 3 The preferred resilience is 31%-33%, and the preferred thickness is 10-20mm.

[0031] Composite: Latex-like viscoelastic comfort sponge is combined with ordinary fast rebound sponge using PUR adhesive. After composite, it is cut into seat cushion specifications to obtain a new formula of slow rebound and fast rebound combined seat comfort sponge.

[0032] Example 1: Raw material preparation: Combination of polyether raw materials: 40 parts of high molecular weight polyether polyol CHE-628, 30 parts of polyether polyol 330N, 20 parts of slow rebound polyether 7321, 8 parts of halogen-free phosphate flame retardant, 3 parts of cell opener CHK-350A, 3 parts of chain extender glycerol, and 1 part of catalyst Z131; Combination isocyanate raw materials: 12 parts toluene diisocyanate, 20 parts diphenyl dimethyl isocyanate, and 8 parts modified isocyanate (model 8019); Additive ingredients: 1.7 parts water, 1.3 parts silicone oil B4900, 5.0 parts reactive color paste; Standard fast rebound sponge: Model HR50, density 50kg / m³ 3 Thickness 20mm.

[0033] Preparation steps: Preparation of polyether composite: Under normal temperature and pressure, the above polyether composite raw materials are sequentially pumped into a mixing tank through a feed pump and stirred for 1 hour until the materials are uniformly mixed. The temperature is then adjusted to 23°C using a hot and cold circulation machine to obtain the polyether composite.

[0034] Preparation of composite isocyanate: Under normal temperature and pressure, the above composite isocyanate raw materials are sequentially pumped into the mixing tank through a feed pump and stirred for 0.5 hours until the materials are uniformly mixed. The temperature is then adjusted to 23°C using a hot and cold circulation machine to obtain composite isocyanate.

[0035] Additive preparation: Add 1.7 parts water, 1.3 parts silicone oil B4900, and 5.0 parts reactive color paste to the water tank, silicone oil tank, and color paste tank, respectively.

[0036] One-step continuous production: A horizontal continuous foaming device is used. Precision metering pumps measure each material according to a mass ratio of polyether:isocyanate:water:silicone oil B4900:reactive colorant = 100:40:1.7:1.3:5.0, and simultaneously transport them to a mixing system for thorough mixing. The mixed material is continuously poured onto paper molds, which are then transported by conveyor belt. After the blocks have reacted and solidified, they are cut into specific lengths. The blocks are then transported to a curing area for curing for at least 48 hours. After curing, they are sliced ​​according to specifications to obtain a latex-like viscoelastic comfort sponge. This sponge is 15mm thick and has a density of 60-68kg / m³. 3 It has an excellent cell structure and a resilience of 32.7%.

[0037] Composite: The above-mentioned latex-like viscoelastic comfort sponge is combined with ordinary fast rebound sponge using PUR adhesive. After composite, it is cut into seat cushion specifications to obtain a new formula of slow rebound and fast rebound combined seat comfort sponge, which is then applied to the comfort layer of automotive seats.

[0038] Example 2 Raw material preparation: Combination of polyether raw materials: 50 parts of high molecular weight polyether polyol CHE-628, 30 parts of polyether polyol 330N, 20 parts of slow rebound polyether 7321, 8 parts of halogen-free phosphate flame retardant, 3 parts of cell opener CHK-350A, 3 parts of chain extender glycerol, and 2 parts of catalyst Z131; Combination isocyanate raw materials: 18.25 parts toluene diisocyanate, 10.95 parts diphenyl dimethyl isocyanate, and 7.3 parts modified isocyanate (model 8019); Additive raw materials: 1.9 parts water, 2.1 parts silicone oil B4900, 5.0 parts reactive color paste; Standard fast rebound sponge: Model HR50, density 50kg / m³ 3 Thickness 25mm.

[0039] Preparation steps: Preparation of polyether composite: Under normal temperature and pressure, the above polyether composite raw materials are sequentially pumped into a mixing tank through a feed pump and stirred for 2 hours until the materials are uniformly mixed. The temperature is then adjusted to 25°C using a hot and cold circulation machine to obtain the polyether composite.

[0040] Preparation of composite isocyanate: Under normal temperature and pressure, the above composite isocyanate raw materials are sequentially pumped into the mixing tank through a feed pump and stirred for 1 hour until the materials are uniformly mixed. The temperature is then adjusted to 25°C using a hot and cold circulation machine to obtain composite isocyanate.

[0041] Additive preparation: Add 1.9 parts water, 2.1 parts silicone oil B4900, and 5.0 parts reactive color paste to the water tank, silicone oil tank, and color paste tank, respectively.

[0042] One-step continuous production: A horizontal continuous foaming equipment is used. Precision metering pumps measure each material according to a mass ratio of polyether:isocyanate:water:silicone oil B4900:reactive colorant = 100:36.5:1.9:2.1:5.0, and simultaneously transport them to a mixing system for thorough mixing. The mixed material is continuously poured onto paper molds, which are then transported by conveyor belt. After the blocks have reacted and solidified, they are cut into specific lengths. The blocks are then transported to a curing area for curing for at least 48 hours. After curing, they are sliced ​​according to specifications to obtain a latex-like viscoelastic comfort sponge. This sponge is 18mm thick and has a density of 58-65kg / m³. 3 It has an excellent cell structure and a resilience rate of 31.2%.

[0043] Composite: The above-mentioned latex-like viscoelastic comfort sponge is combined with ordinary fast rebound sponge using PUR adhesive. After composite, it is cut into seat cushion specifications to obtain a new formula of slow rebound and fast rebound combined seat comfort sponge, which is then applied to the comfort layer of automotive seats.

[0044] test: The physical properties of Examples 1, 2, Comparative Example 1 (conventional slow rebound), and Comparative Example 2 (ordinary flexible foam) are shown in Table 1. Table 1 Note: Rebound test standard GB / T 6670; By comparing Table 1, it can be seen that in the comparison between Example 1 and Example 2, as the proportion of toluene diisocyanate in the combined isocyanate increases, the elongation of the product is improved to a certain extent, the hardness decreases accordingly, and the tensile strength and tear strength do not change much; adjustments can be made according to the actual needs of customers. In the comparison between the examples and conventional slow rebound and ordinary soft foam, the biggest difference is the hysteresis loss: the hysteresis loss of the examples is about 21.2%, slow rebound is 42%, and ordinary soft foam is 26%. Regarding the comparison of the ball rebound properties: the rebound of the examples is basically about 30%, slow rebound is about 15%, and ordinary soft foam is over 50%; it can be seen from Table 1 that the hysteresis loss of the examples is the smallest, which will also affect the comfort of the seat.

[0045] Table 2 compares the comfort factors of the above embodiment using 30mm thick fast-resilience foam + 12.8mm foam, the comparative example, and a simple 42.8mm thick high-resilience foam (380*380mm): Table 2 Test method: ASTM D3574; By comparing the data in Table 2 above, 65% / 25% represents the SAG (Comfort Factor). It can be seen that the comfort factor of the combination of the embodiment and the fast rebound is higher; the comfort factor of high rebound alone is the lowest.

[0046] Figure 6 The test results, which combined VLPU foam with ordinary fast-rebound HR foam at different thickness ratios, showed hardness values ​​of 25% and 65%. It can be seen that: 1. When the thickness is similar, the softer the foam, the more uniform the pressure distribution; 2. When the hardness is similar, the softer the surface layer, the more uniform the pressure distribution; 3. Selecting a composite material of fast rebound and viscoelastic foam with an appropriate thickness minimizes stress induction.

[0047] from Figure 6 It can be seen that the combination of fast rebound HR foam and viscoelastic VLPU foam can significantly improve the comfort factor (SAG) of the product.

[0048] It can be preliminarily concluded that the thickness ratio of VLPU to HR foam is 3:7, and the SAG of its composite product is the highest, reaching more than 3.

[0049] Figure 7 This is a pressure distribution diagram of ordinary foam; the ordinary foam tested is ordinary fast rebound foam, i.e., HR50. Figure 8 A diagram showing the perceived pressure distribution of foam in a car seat cushion. Figure 9 This is a diagram showing the perceived pressure distribution of latex viscoelastic foam in Example 1; from... Figure 7-9 It can be seen that ordinary foam has more concentrated stress than latex-like viscoelastic foam (red area); studies have shown that sitting on seats with concentrated stress for extended periods can easily lead to fatigue. In contrast, the open-cell molecular structure of latex-like viscoelastic foam is similar to that of human cells, exhibiting better biocompatibility and providing passengers with superior skin-friendly comfort.

[0050] Conclusion: The composite sponge disclosed in this invention can better absorb and disperse pressure compared to traditional seat cushions, reducing driver discomfort and greatly improving comfort; it solves the shortcomings of ordinary soft foam sponges used in seat foam, such as insufficient comfort and fatigue during long-term driving.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification.

Claims

1. A comfort-enhancing composite foam for automobile seats, characterized in that, It is made by bonding latex-like viscoelastic comfort sponge with ordinary fast-rebound sponge through adhesive; The latex-like viscoelastic comfort sponge is prepared from a combination of polyether, a combination of isocyanate and additives in a mass ratio of 100:(35-45):(8-10); by weight, the combination of polyether comprises 80-90 parts of polyether polyol composition, 7-10 parts of flame retardant, 2-4 parts of cell opener, 2-4 parts of chain extender, and 1-2 parts of catalyst. The additives include water, silicone oil, and reactive color paste.

2. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The polyether polyol composition consists of high molecular weight polyether polyol CHE-628, polyether polyol 330N and slow rebound polyether 7321, with a mass ratio of 5:3:

2.

3. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The flame retardant is a halogen-free phosphate flame retardant, the pore-opening agent is CHK-350A, and the chain extender is glycerol.

4. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The catalyst is Z131, and the silicone oil is B4900.

5. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The combined isocyanate is one or more of toluene diisocyanate, diphenyl dimethyl isocyanate, and modified isocyanate.

6. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The composition of polyether: isocyanate: water: catalyst: silicone oil: reactive pigment is 100: (35-45): (1.5-1.9): (1-2): (1-3): (3-5).

7. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The standard fast rebound sponge is model HR50 with a density of 50 kg / m³. 3 The thickness of the latex-like viscoelastic comfort sponge is 10-20mm, while the thickness of ordinary fast-rebound sponge is 15-30mm.

8. The comfort composite foam for automobile seats as described in claim 1, characterized in that, The latex-like viscoelastic comfort sponge has a porous structure and a density of 58-68 kg / m³. 3 The rebound rate is 31%-33%.

9. A method for producing a comfort composite sponge for automobile seats according to claim 1, characterized in that, Includes the following steps: (1) Preparation of polyether combination: At room temperature and pressure, add the polyether polyol composition, flame retardant, cell opener and chain extender to the mixing tank according to the ratio, stir for 1-2 hours and then adjust the temperature to 23-25℃ through a hot and cold circulation machine; (2) Preparation of combined isocyanate: Under normal temperature and pressure, add the combined isocyanate to the stirred tank according to the ratio, stir for 0.5-1 hour, and then adjust the temperature to 23-25℃ through a hot and cold circulation machine; (3) Preparation of additives: Add water, catalyst, silicone oil and reactive color paste to the corresponding tanks respectively; (4) One-step continuous production: The above materials are accurately measured by a precision metering pump, transported to the mixing system for full mixing, and continuously poured onto the paper mold. After being conveyed by a conveyor belt, reacted and shaped, and cut, the block material is transported to the curing site for curing for more than 48 hours. Then it is sliced ​​according to specifications to obtain a latex-like viscoelastic comfort sponge. (5) Composite: The latex-like viscoelastic comfort sponge is composited with ordinary fast rebound sponge using PUR adhesive to obtain the final product.

10. The production method as described in claim 9, characterized in that, The novel slow-rebound and fast-rebound combined seat comfort foam prepared by the method also includes being cut into seat cushion specifications and applied to the comfort layer of automotive seats.

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