Three-dimensional integrated waist support cushion and preparation method thereof

Abstract

The invention relates to a preparation method of a three-dimensional integrated waist protection cushion, which comprises the following steps: respectively drying SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer, sieving calcium carbonate to 800-1200 meshes, and placing aside for later use; adding the SEBS resin, the polypropylene grafted maleic anhydride resin and the SPUU elastomer in specified proportion into a high-speed mixer, and starting low-speed stirring; gradually adding the calcium carbonate into the high-speed mixer, and continuously stirring until the calcium carbonate is uniformly distributed; and finally, adding pentaerythritol tetrapropionate and a lubricant, and stirring to obtain the dry blend. Three-dimensional integration of rigid supporting (a TPE framework), elastic buffering (high-resilience sponge) and a comfortable surface layer (linen fabric) is achieved, the supporting requirements of human engineering for the waist and the buttocks are met, and comprehensive improvement of the strength, comfort, durability and human engineering of the waist protection cushion is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of seat preparation, and in particular relates to a three-dimensional waist-protecting seat cushion and a preparation method thereof. Background Art

[0002] The patent announcement number is CN113679204A, which discloses a posture-correcting cushion and a preparation method thereof. The patent announcement discloses a posture-correcting cushion on the market, wherein a back piece, a first composite film, a plastic shell, a molded sponge, a second composite film and a front piece of the posture-correcting cushion are stacked in sequence from bottom to top. The posture-correcting cushion has an upper and lower six-layer structure. The connection relationship between the six-layer structure needs to be considered in the preparation, and there is still room for improvement in the structure.

[0003] The 6-layer structure is improved to a 4-layer structure, and the foaming material layer fills up the unfilled cavity space between the pad and the remaining part of the bonding membrane through foaming, making the overall structure more integrated and the connections between the layers more tightly.

[0004] However, the foam material itself will age with the passage of time and changes in environmental factors, resulting in weakened viscosity or even failure, which will directly affect the durability of the seat cushion; with the development of technology, most of the existing seat cushions are made by one-piece molding, that is, the raw materials are continuous and uniform during the preparation process, and the prepared seat cushions can have higher structural stability and overall strength.

[0005] Based on the above background, the present invention designs a three-dimensional waist protection cushion and a preparation method thereof. Summary of the invention

[0006] The object of the present invention is to provide a three-dimensional waist protection cushion and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides a method for preparing a three-dimensional integrated waist cushion, comprising the following steps:

[0008] Step 1: Dry the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer separately, sieve the calcium carbonate to 800-1200 mesh, and set aside for use;

[0009] Step 2: adding the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer in a specified proportion into a high-speed mixer and starting low-speed stirring;

[0010] Step 3: gradually add the calcium carbonate into the high-speed mixer and continue stirring until it is evenly distributed;

[0011] Step 4: Finally, add pentaerythritol tetrapropionate and lubricant and stir to obtain a dry mix;

[0012] Step 5: adding the dry blend into the hopper of a twin-screw extruder, and injecting an equal proportion of paraffin oil into the melting section of the extruder, and fully melt-blending the components at 160-200° C. to obtain a TPE material;

[0013] Step 6: Cooling and solidifying the TPE material, and cutting it into granules by a granulator to obtain TPE granules;

[0014] Step 7: washing and drying the TPE particles in sequence, and then hot-pressing the dried TPE particles at 180-220° C. to form an integrally formed skeleton;

[0015] Step 8: Choose a high-resilience sponge and cut it into two sponge pads according to the size of the frame;

[0016] Step 9: Select linen cloth and cut it into a size that matches the sponge pad to obtain two surface layers;

[0017] Step 10: fix the sponge pad to the seat cushion and backrest of the frame respectively, and then wrap the two surface layers on the outside of the sponge pad and the frame respectively, fix the surface layers by hot pressing to obtain the seat cushion.

[0018] Preferably, in step 1: the styrene content in the SEBS resin needs to be controlled between 20% and 45%.

[0019] Preferably, in step 1: the grafting rate of the polypropylene grafted with maleic anhydride needs to be controlled at 0.8%-1.2%.

[0020] Preferably, in step 1: the SPUU elastomer is polytetramethylene ether glycol, and its molecular weight combination is S1 k+2k-31.

[0021] Preferably, step five further comprises: premixing the SEBS resin with paraffin oil in advance, leaving the mixture to stand for more than 20 hours, and then mixing the mixture with other components.

[0022] Preferably, the TPE material in step five comprises the following components: in proportion, 40-50% of SEBS resin, 10-15% of paraffin oil, 7-12% of polypropylene grafted maleic anhydride resin, 13-18% of supramolecular polyelastomer (SPUU), 5-10% of calcium carbonate, 0.2-0.5% of pentaerythritol tetrapropionate and 0.2-0.5% of lubricant.

[0023] Preferably, the TPE material in step five comprises the following components: the TPE material comprises the following components, in proportion, 50% of SEBS resin, 12% of paraffin oil, 12% of polypropylene grafted maleic anhydride resin, 15% of supramolecular polyelastomer (SPUU), 10% of calcium carbonate, 0.5% of pentaerythritol tetrapropionate and 0.5% of lubricant.

[0024] On the other hand, the present invention provides a three-dimensional waist protection cushion, including a frame, a sponge pad and a surface layer. The frame is divided into a cushion part, a lumbar support part and a backrest part. The two sponge pads are respectively fixed on the cushion part and the backrest part on the side close to the human body.

[0025] Preferably, the frame is integrally formed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention adopts an integrally formed frame design, avoiding the problem of complex connection between layers in a traditional multi-layer structure seat cushion, reducing the decrease in durability caused by aging of the interlayer adhesive, making the overall structure of the seat cushion more stable and having a longer service life;

[0028] The frame is made of TPE material. The material formula and processing technology are optimized during preparation to ensure that it provides rigid support while having good flexibility and fatigue resistance, ensuring that the seat cushion will not deform after long-term use.

[0029] Secondly, we use high-resilience sponge as the filling material, which has excellent resilience and breathability, can provide uniform support under different deformation states, and effectively relieve the pressure caused by sitting for a long time;

[0030] Finally, linen fabric is used to make the surface layer, and the linen fabric is fixed to the outside of the sponge pad and TPE frame through a hot pressing process to ensure that the surface layer is tightly combined with the internal structure to form a whole, further improving the durability and stability of the cushion;

[0031] The above realizes the three-dimensional integration of rigid support (TPE skeleton), elastic cushioning (high rebound sponge) and comfortable surface (linen cloth), meets the ergonomic support requirements for the waist and hips, and achieves a comprehensive improvement in the strength, comfort, durability and ergonomics of the lumbar support cushion. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the waist protection cushion in the present invention;

[0033] Figure 2 It is an exploded view of the waist protection cushion in the present invention.

[0034] Numbers in the figure: 1-frame, 2-sponge pad, 3-surface layer, 101-seat cushion part, 102-lumbar support part, 103-backrest part. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] A method for preparing a three-dimensional waist-protecting cushion. It should be noted that the cushion is composed of at least a frame 1, a sponge pad 2 and a surface layer 3, and the factor that affects its quality the most is the raw material selection and preparation process of the frame 1. This embodiment aims to design a high-strength and tough frame 1 as a strong basis for preparing a waist-protecting cushion.

[0038] The frame 1 is made by integrally molding with a precision mold, has high toughness, can be used to support the entire weight of the human body, and can fit the bodies of different people, play a role in protecting the waist and correcting sitting posture. The preparation process of the raw materials includes:

[0039] S01 Dry the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer separately, sieve the calcium carbonate to 800-1200 mesh, and set aside for use;

[0040] S02 Take the specified proportion of SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer and add them into the high-speed mixer, and start low-speed stirring;

[0041] S03 gradually add calcium carbonate into the high-speed mixer and continue stirring until it is evenly distributed;

[0042] S04 finally adds pentaerythritol tetrapropionate and lubricant and stirs to obtain a dry mix;

[0043] Specifically, the skeleton 1 is made of TPE raw material, and the basic material of TPE can be SBS / SEBS. This embodiment selects SEBS resin (styrene-ethylene-butylene-styrene block copolymer) as the main elastomer component, which has a toluene viscosity of ≥1000cp (25°C), excellent low temperature resistance and good mechanical properties, and can give the waist cushion a soft and elastic touch while maintaining a certain shape stability.

[0044] Furthermore, the styrene content can be controlled at 20%-45%, and the viscosity range can be controlled at 1700-2200cp. When the styrene content is controlled at 20%-45%, the tensile strength and elongation at break of SEBS can be optimized, thereby ensuring that the skeleton 1 has good elastic properties. At the same time, in the above-mentioned limited viscosity, the sensitivity of SEBS to shear will also be reduced, and the shear force can be adjusted during the processing to achieve control of material flow and improve processing efficiency.

[0045] By optimizing SEBS by controlling the styrene content and viscosity, SEBS can be made more compatible with fillers (such as calcium carbonate) and can better disperse the fillers; at the same time, it can also have good plasticizer absorption, such as better mixing with plasticizers, improving the flexibility of the prepared skeleton 1.

[0046] Polypropylene grafted maleic anhydride resin is mainly used as a compatibilizer. Through chemical bonding, it can form good interface compatibility with SEBS resin, calcium carbonate, and SPUU elastomer, reduce interface stress concentration, enhance elastic recovery force, and improve the overall uniformity and stability of the skeleton 1.

[0047] Furthermore, the grafting rate of polypropylene grafted maleic anhydride resin can be controlled at 0.8%-1.2%. Experiments show that when the grafting rate is too high, the compatibilizer may aggregate to form an independent third phase, which in turn reduces the compatibility. Therefore, when the grafting rate is 0.8%-1.2%, the compatibilizer is most efficient.

[0048] SPUU elastomer (polyurethane elastomer) is mainly used as a reinforcing phase, which has excellent mechanical properties and can enhance the durability of the skeleton 1 and maintain good shape and performance after long-term use.

[0049] The above three raw materials, SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer, are easy to absorb water in a humid environment, so they all need to be dried in advance. Specifically, they can be placed in a vacuum drying oven with the temperature controlled at 90°C and dried for 12 to 24 hours to ensure their dryness.

[0050] Furthermore, calcium carbonate is mainly used as a filler, which improves the rigidity and hardness of the material while minimizing the impact on the flexibility of the material. At the same time, as a cheap inorganic filler, calcium carbonate can also effectively reduce the preparation cost. It should be noted that in the production process of calcium carbonate, some calcium carbonate may not be completely decomposed, so it is necessary to intercept these particles larger than the diameter of the sieve hole through screening. The calcium carbonate particles are controlled within a certain particle size range by screening, such as 800-1200 mesh in this embodiment, so that the calcium carbonate can be better mixed in the application, thereby ensuring its quality and purity when used as a filler.

[0051] Pentaerythritol tetrapropionate is mainly used as a plasticizer, which reduces the glass transition material of the material, making the material easier to flow during processing, and ultimately improving the flexibility of the skeleton 1. A certain amount of lubricant can also be appropriately added to reduce the friction of the material during mixing and processing, prevent the material from agglomerating or adhering, and reduce equipment wear.

[0052] Thus, first, take the designated amount of SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer and add them to the high-speed mixer, start low-speed stirring to ensure the stability of the performance of the mixture; when adding calcium carbonate, in order to prevent calcium carbonate from agglomerating, it needs to be gradually added while the high-speed mixer continues to stir until the calcium carbonate is evenly distributed in the mixture, and finally add pentaerythritol tetrapropionate and lubricant, continue stirring, so that all ingredients are fully mixed to form a uniform dry blend. It should be noted that the state of the mixture must be observed at all times during the stirring process to ensure that the components are evenly distributed and a dry blend with excellent quality is obtained.

[0053] Example 2

[0054] A method for preparing a three-dimensional waist cushion, wherein the preparation process of the raw material of the frame 1 includes:

[0055] S01 Dry the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer separately, sieve the calcium carbonate to 800-1200 mesh, and set aside for use;

[0056] S02 Take the specified proportion of SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer and add them into the high-speed mixer, and start low-speed stirring;

[0057] S03 gradually add calcium carbonate into the high-speed mixer and continue stirring until it is evenly distributed;

[0058] S04 finally adds pentaerythritol tetrapropionate and lubricant and stirs to obtain a dry mix;

[0059] Among them, SEBS resin (styrene-ethylene-butylene-styrene block copolymer) is selected as the main elastomer component, which has excellent low-temperature resistance and good mechanical properties, and can give the waist cushion a soft and elastic touch; polypropylene grafted maleic anhydride resin is selected as a compatibilizer, which forms good interface compatibility with other materials through chemical bonding, reduces interface stress concentration, and improves elastic recovery; SPUU elastomer (polyurethane elastomer) is selected as a reinforcing phase, which has excellent mechanical properties and can enhance the durability of the skeleton 1, and can still maintain good shape and performance after long-term use; calcium carbonate is selected as a filler to improve the dispersibility and the material's resistance to compression deformation; and antioxidants and lubricants (pentaerythritol tetrapropionate) are selected to reduce thermal degradation during processing and maintain the integrity of the molecular chain.

[0060] Specifically, the SPUU elastomer uses polytetramethylene ether glycol to form an alternating arrangement of hard segments and soft segments. The hard segments form rigid domains through hydrogen bonds and crystal stacking. The higher the proportion of hard segments, the greater the hardness of the material. The soft segments provide elasticity through long-chain ether bonds to form a hierarchical structure, which gives the material excellent mechanical properties, enhances the durability of the skeleton 1, and can still maintain good shape and performance after long-term use.

[0061] Furthermore, polytetramethylene ether glycol is a molecular weight combination of S1 k and 2k, and the resulting mixed design is expressed as S1 k+2k-* (* is a numerical expression), wherein the S prefix represents the soft segment identifier, indicating the molecular weight of polytetramethylene ether glycol (PTMEG) (unit: kilodalton), such as S1 k corresponding to a molecular weight of 1000, S2k is 2000, and S3k is 3000; the suffix number indicates the ratio, representing the mass percentage of the hard segment in the material, such as 31% for the hard segment and 69% for the soft segment (composed of a mixture of S1 k and S2k), which is expressed as S1 k+2k-31, and so on.

[0062] Following the above content, this embodiment uses a mixed soft segment design of S1 k+2k-31, so that the material hardness covers 56A to 95A, while maintaining good comfort and flexibility (low hardness area); and the tensile toughness is as high as 819MJ / m 3 , impact strength reaches 6.1MJ / m 2 That is, in actual application, the raw material of the skeleton 1 achieves a good balance between hardness, toughness and impact strength. This balance enables the lumbar support cushion skeleton 1 to provide sufficient support while not losing comfort due to being too hard, nor lacking stability due to being too soft. In addition, the high toughness and high impact strength of the raw material further enhance the durability and safety of the product, enabling it to meet the performance requirements of the lumbar support cushion in a variety of usage scenarios.

[0063] Example 3

[0064] A method for preparing a three-dimensional waist cushion, wherein the preparation process of the raw material of the frame 1 includes:

[0065] S01 Dry the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer separately, sieve the calcium carbonate to 800-1200 mesh, and set aside for use;

[0066] S02 Take the specified proportion of SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer and add them into the high-speed mixer, and start low-speed stirring;

[0067] S03 gradually add calcium carbonate into the high-speed mixer and continue stirring until it is evenly distributed;

[0068] S04 finally adds pentaerythritol tetrapropionate and lubricant and stirs to obtain a dry mix;

[0069] S05: Take the dry blend and add it into the hopper of the twin-screw extruder. At the same time, take an equal proportion of paraffin oil and inject it into the melting section of the extruder. At 160-200°C, the components are fully melt-blended to obtain TPE material.

[0070] S06: cooling and solidifying the TPE material, and cutting it into particles by a pelletizer to obtain TPE particles;

[0071] S07: washing and drying the TPE particles in sequence, and then hot-pressing and injection-molding the dried TPE particles at 180-220° C. to form an integrally formed skeleton 1.

[0072] Specifically, a dry blend is obtained in steps 1-4, and the dried dry blend is weighed according to the formula ratio and added to the hopper of the twin-screw extruder, and then an equal proportion of paraffin oil is injected into the melting section of the extruder in stages through a metering pump to avoid the one-time addition causing the surface of the SEBS particles to absorb rapidly to form a sticky surface layer, which hinders further swelling inside; then the extruder is started, the temperature is set at 160-200°C, and the screw speed and pressure are adjusted according to the characteristics of the raw materials to allow the components to be fully melt-blended to obtain a TPE material.

[0073] The TPE material after melt blending is cooled and solidified by air cooling or water cooling device. The cooling speed needs to be moderate to prevent excessive internal stress of the material. The TPE material is then cut into granules by a pelletizer to obtain TPE granules. Then, a suitable solvent is selected to wash the TPE granules in turn to remove surface impurities. The washed TPE granules are dried and then sent to the hopper of the injection molding machine. The temperature is set at 180-220°C. The granules are melted and injected into the mold through high-pressure injection of the injection molding machine so that the melt evenly fills the mold cavity. After the injection molding is completed, the pressure is maintained in the mold for a certain period of time, and finally cooled and solidified to form an integrated skeleton 1.

[0074] Furthermore, SEBS resin and paraffin oil can be premixed in advance, left to stand for more than 20 hours, and then mixed with other components; experiments show that the premixing method can increase the elongation at break of TPE from 280%-320% to 350%-400%. In addition, after SEBS resin and paraffin oil are premixed, paraffin oil can more fully penetrate into the molecular chain of SEBS, making SEBS particles swell evenly and better compatible with other components, reducing mechanical property fluctuations caused by uneven swelling and phase separation caused by temperature changes. At the same time, it can also avoid the sticky surface layer formed by the rapid contact of paraffin oil with the surface of SEBS particles when added at one time, so that the surface can be better maintained smooth and surface defects can be reduced in subsequent processing.

[0075] Example 4

[0076] like Figure 1 to Figure 2 The three-dimensional integrated waist cushion shown in the figure is prepared by preparing a frame 1 according to the above embodiment, and then preparing the waist cushion according to the following steps:

[0077] S08 uses high-resilience sponge and cuts it into two sponge pads 2 according to the size of the frame 1;

[0078] S09 selects linen cloth and cuts it into a size matching the sponge pad 2 to obtain two surface layers 3;

[0079] S10 fixes the sponge pad 2 to the seat cushion part 101 and the backrest part 103 of the frame 1 respectively, and then wraps two surface layers 3 on the outside of the sponge pad 2 and the frame 1 respectively, fixes the surface layers 3 by hot pressing, and obtains a seat cushion.

[0080] Specifically, the frame 1 includes a seat cushion portion 101, a lumbar support portion 102 and a backrest portion 103 which are connected in sequence. The seat cushion portion 101, the lumbar support portion 102 and the backrest portion 103 are integrally injection molded. The seat cushion portion 101 has an upwardly protruding portion at one end away from the lumbar support portion 102, and the protruding portion extends in an arc shape to both sides. Both sides of the seat cushion portion 101 are upwardly curled, and recessed positions are respectively formed between the protruding portion and both sides of the seat cushion portion 101. Both sides of the backrest portion 103 extend forward in an arc shape to form a covering structure.

[0081] Secondly, a sponge material with high resilience is selected and the high resilience sponge is cut into two pieces according to the size of the TPE frame 1 and respectively arranged on the seat cushion 101 and the backrest 103 . When cutting, it is necessary to ensure that the size of the sponge pad 2 fits closely with the corresponding area of ​​the frame 1 to ensure a perfect match during subsequent installation.

[0082] Next, linen cloth is selected as the cloth for making the surface layer 3. Accordingly, according to the size of the sponge pad 2, the linen cloth is cut into two pieces and respectively arranged on the surface layer 3 of the seat cushion 101 and the backrest 103. During the cutting process, the edges of the cloth must be ensured to be neat to avoid burrs or irregular shapes.

[0083] During assembly, first fix the two cut sponge pads 2 on the cushion part 101 and the backrest part 103 of the TPE frame 1 respectively. The fixing method can be glue or other adhesives to ensure that they fit tightly with the frame 1 and will not shift during use; then wrap the two cut linen cloths on the outside of the sponge pad 2 and the frame 1 respectively, and fully cure the adhesive between the cloth and the sponge and the frame 1 through high temperature and pressure, and finally achieve the fixation of the surface layer 3. After hot pressing treatment, the surface layer 3 is tightly combined with the internal structure, and finally a complete lumbar support cushion is obtained.

[0084] It can be understood that the present embodiment firstly introduces TPE material to make the skeleton 1 of the lumbar support cushion, making full use of the high strength, high elasticity and wear resistance of the TPE material, so that it has good flexibility and anti-fatigue performance while providing rigid support, ensuring that the cushion will not be deformed after long-term use; secondly, high-rebound sponge is selected as the filling material, which has excellent resilience and air permeability, can provide uniform support force under different deformation states, and effectively relieve the pressure caused by sitting for a long time; finally, linen cloth is selected to make the surface layer 3, and the linen cloth is fixed to the outside of the sponge pad 2 and the TPE skeleton 1 through a hot pressing process, ensuring that the surface layer 3 is tightly combined with the internal structure to form a whole, further improving the durability and stability of the cushion.

[0085] The above realizes the three-dimensional integration of rigid support (TPE skeleton 1), elastic cushioning (high-resilience sponge) and comfortable surface (linen fabric), meeting the ergonomic support requirements for the waist and hips, and ultimately creating a lumbar support cushion that perfectly combines functionality and comfort.

[0086] Example 5

[0087] A method for preparing a three-dimensional integrated waist cushion, wherein the preparation process of the TPE material in the skeleton 1 raw material includes:

[0088] 40-50% of SEBS resin, 7-12% of polypropylene grafted maleic anhydride resin, and 13-18% of supramolecular polyelastomer (SPUU) are taken and dried respectively, and then 5-10% of calcium carbonate is taken and sieved, and SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer are added into a high-speed mixer, and low-speed stirring is started, and calcium carbonate is gradually added into the high-speed mixer, and stirring is continued until uniform distribution, and finally 0.2-0.5% of pentaerythritol tetrapropionate and 0.2-0.5% of lubricant are added and stirred to obtain a dry blend; the dry blend is taken and added into a hopper of a twin-screw extruder, and at the same time, an equal proportion of paraffin oil is taken and injected into a melting section of the extruder, and each component is fully melt-blended at 160-200° C. to obtain a TPE material.

[0089] The TPE material is cooled and solidified, and cut into particles by a pelletizer to obtain TPE particles. The TPE particles are washed and dried in sequence, and then the dried TPE particles are hot-pressed and injection-molded to form an integrally formed skeleton 1 at 180-220° C. High-resilience sponge is selected and cut into two sponge pads 2 according to the size of the skeleton 1. Linen cloth is selected and cut into a size matching the sponge pad 2 to obtain two surface layers 3. The sponge pad 2 is respectively fixed to the seat cushion part 101 and the backrest part 103 of the skeleton 1, and then the two surface layers 3 are respectively wrapped on the outside of the sponge pad 2 and the skeleton 1, and the surface layer 3 is fixed by hot pressing to obtain a seat cushion.

[0090] Example 6

[0091] A method for preparing a three-dimensional integrated waist cushion, wherein the preparation process of the TPE material in the skeleton 1 raw material includes:

[0092] 50% of SEBS resin, 12% of polypropylene grafted maleic anhydride resin, and 15% of supramolecular polyelastomer (SPUU) are taken and dried respectively, and then 10% of calcium carbonate is taken and sieved, and SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer are added into a high-speed mixer, and low-speed stirring is started, and calcium carbonate is gradually added into the high-speed mixer, and stirring is continued until uniform distribution, and finally 0.5% of pentaerythritol tetrapropionate and 0.5% of lubricant are added and stirred to obtain a dry blend; the dry blend is taken and added into a hopper of a twin-screw extruder, and at the same time, an equal proportion of paraffin oil is taken and injected into the melting section of the extruder, and each component is fully melt-blended at 160-200° C. to obtain a TPE material.

[0093] The TPE material is cooled and solidified, and cut into particles by a pelletizer to obtain TPE particles. The TPE particles are washed and dried in sequence, and then the dried TPE particles are hot-pressed and injection-molded to form an integrally formed skeleton 1 at 180-220° C. High-resilience sponge is selected and cut into two sponge pads 2 according to the size of the skeleton 1. Linen cloth is selected and cut into a size matching the sponge pad 2 to obtain two surface layers 3. The sponge pad 2 is respectively fixed to the seat cushion part 101 and the backrest part 103 of the skeleton 1, and then the two surface layers 3 are respectively wrapped on the outside of the sponge pad 2 and the skeleton 1, and the surface layer 3 is fixed by hot pressing to obtain a seat cushion.

[0094] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0095] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing a three-dimensional waist cushion, characterized in that: The following steps are involved: Step 1: Dry the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer separately, sieve the calcium carbonate to 800-1200 mesh, and set aside for use; Step 2: adding the SEBS resin, polypropylene grafted maleic anhydride resin and SPUU elastomer in a specified proportion into a high-speed mixer and starting low-speed stirring; Step 3: gradually add the calcium carbonate into the high-speed mixer and continue stirring until it is evenly distributed; Step 4: Finally, add pentaerythritol tetrapropionate and lubricant and stir to obtain a dry mix; Step 5: adding the dry blend into the hopper of a twin-screw extruder, and injecting an equal proportion of paraffin oil into the melting section of the extruder, and fully melt-blending the components at 160-200° C. to obtain a TPE material; Step 6: Cooling and solidifying the TPE material, and cutting it into particles by a pelletizer to obtain TPE particles; Step 7: washing and drying the TPE particles in sequence, and then hot-pressing the dried TPE particles at 180-220° C. to form an integrally formed skeleton; Step 8: Choose a high-resilience sponge and cut it into two sponge pads according to the size of the frame; Step 9: Select linen fabric and cut it into a size that matches the sponge pad to obtain two surface layers; Step 10: fix the sponge pad to the seat cushion and backrest of the frame respectively, and then wrap the two surface layers on the outside of the sponge pad and the frame respectively, fix the surface layers by hot pressing to obtain the seat cushion.

2. In the method for preparing a three-dimensional integrated waist cushion according to claim 1, in step 1: the styrene content in the SEBS resin needs to be controlled between 20% and 45%.

3. In the method for preparing a three-dimensional integrated waist cushion according to claim 1, in step 1: the grafting rate of the polypropylene grafted with maleic anhydride needs to be controlled at 0.8%-1.2%.

4. In the preparation method of a three-dimensional integrated waist cushion according to claim 1, in step 1: the SPUU elastomer is polytetramethylene ether glycol, and its molecular weight combination is S1 k+2k-31.

5. In the method for preparing a three-dimensional integrated waist cushion according to claim 1, step five further comprises: The SEBS resin is premixed with paraffin oil in advance, left to stand for more than 20 hours, and then mixed with other components.

6. According to the preparation method of a three-dimensional integrated lumbar cushion as described in claim 1, the TPE material in step five comprises the following components: in proportion, 40-50% of SEBS resin, 10-15% of paraffin oil, 7-12% of polypropylene grafted maleic anhydride resin, 13-18% of supramolecular polyelastomer (SPUU), 5-10% of calcium carbonate, 0.2-0.5% of pentaerythritol tetrapropionate and 0.2-0.5% of lubricant.

7. According to the preparation method of a three-dimensional integrated lumbar cushion according to claim 6, the TPE material in step five comprises the following components: the TPE material comprises the following components, in proportion, 50% SEBS resin, 12% paraffin oil, 12% polypropylene grafted maleic anhydride resin, 15% supramolecular polyelastomer (SPUU), 10% calcium carbonate, 0.5% pentaerythritol tetrapropionate and 0.5% lubricant.

8. A three-dimensional waist cushion, characterized in that: It comprises a frame, a sponge pad and a surface layer. The frame is divided into a seat cushion part, a waist support part and a backrest part. Two sponge pads are respectively fixed on the seat cushion part and the backrest part on the side close to the human body.

9. According to the three-dimensional integrated waist cushion of claim 8, the frame is integrally formed.

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