Slow-resilience TPE yoga mat and preparation method thereof

Abstract

The invention discloses a slow-rebound TPE (thermoplastic elastomer) yoga mat and a preparation method thereof, and belongs to the technical field of yoga mats, the slow-rebound TPE yoga mat comprises a TPE foaming layer and a PU (polyurethane) foaming layer compounded on the upper surface of the TPE foaming layer. The lower surface of the PU foaming layer is polished, so that the lower surface of the PU foaming layer forms a rough surface, and when the lower surface of the PU foaming layer is coated with an adhesive, the adhesive force of the adhesive to the surface of the PU foaming layer is high, so that the adhesive can effectively play a role in bonding the PU foaming layer and the TPE foaming layer; corona treatment is carried out on the surface of the TPE foaming layer, so that polar groups can be formed on the surface of the non-polar TPE foaming layer, the adhesive can be wetted and spread on the upper surface of the TPE foaming layer, the problem that the TPE foaming layer and the PU foaming layer are difficult to bond due to large surface energy difference between the TPE foaming layer and the PU foaming layer can be solved, and slow resilience is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of yoga mats, and in particular to a slow-rebound TPE yoga mat and a preparation method thereof. Background Art

[0002] Existing yoga mats are mostly made of PVC, TPE, EVA and other materials. Although yoga mats made of the above materials have good anti-slip properties and can achieve improved wear resistance and scratch resistance by adjusting the material formula, yoga mats made of the above materials have a fast rebound speed and insufficient cushioning and support. Yoga mats rebound immediately after being compressed, and have poor absorption of impact force on joints (such as knees, elbows, etc.), and cannot effectively protect the joints of yoga practitioners.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] The purpose of the present invention is to provide a slow-rebound TPE yoga mat and a preparation method thereof, aiming to solve the problem that existing yoga mats have insufficient cushioning and support, and cannot effectively protect the joints of yoga practitioners.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a method for preparing a slow-rebound TPE yoga mat, wherein the slow-rebound TPE yoga mat comprises a TPE foam layer and a PU foam layer composited on the upper surface of the TPE foam layer; the preparation method comprises the following steps:

[0007] S001. Polish the surface of the PU foam layer to increase the roughness of the lower surface of the PU foam layer to form a mechanical bite point;

[0008] S002. The surface of the TPE foam layer is corona treated to form polar groups on the upper surface of the TPE foam layer;

[0009] S003 respectively, coating the adhesive on the lower surface of the PU foam layer and the upper surface of the TPE foam layer;

[0010] S004 After gluing, the adhesive is dried, and then the PU foam layer and the TPE foam layer are placed in a hot pressing laminating machine, so that the PU foam layer is hot pressed and composited on the upper surface of the TPE foam layer;

[0011] S005. After the hot pressing is completed, the yoga mat is left to stand to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify.

[0012] Optionally, in step S003, the adhesive includes a water-based polyurethane adhesive.

[0013] Optionally, in step S004, the temperature of the hot pressing composite is 120-160° C., the pressure is 0.5-1.5 MPa, and the holding time is 30-60 seconds.

[0014] The present invention also provides a slow-rebound TPE yoga mat, which is made by the aforementioned preparation method of the slow-rebound TPE yoga mat, and the PU foam layer comprises the following components in parts by weight:

[0015] 70-80 parts of polyether polyol, 20-25 parts of isocyanate, 4-6 parts of chain extender, 1-2 parts of water, 1-1.5 parts of pore opener, 0.5-1 part of color paste, 0.1-0.3 parts of ammonium catalyst, and 0.05-0.1 parts of tin catalyst.

[0016] Optionally, the average molecular weight of the polyether polyol is 3000-3500.

[0017] Optionally, the chain extender includes diethylenetriamine and ethylene glycolamine, and the ratio of diethylenetriamine to ethylene glycolamine in parts by weight is 3:2.

[0018] Optionally, the PU foam layer further comprises the following components in parts by weight: 3 to 4 parts of stearic acid-modified nano-silicon dioxide.

[0019] Optionally, the preparation method of the stearic acid-modified nanosilica comprises the following steps:

[0020] Y001. Stearic acid was mixed with anhydrous ethanol solution to obtain a mixed solution;

[0021] Y002. Mixing the nano-silica with the mixed solution to uniformly disperse the nano-silica in the mixed solution, and then heat-insulating to obtain the stearic acid-modified nano-silica.

[0022] Optionally, the TPE foam layer comprises the following components in parts by weight:

[0023] Thermoplastic elastomer TPE 60-70 parts, polypropylene 20-30 parts, white oil 15-25 parts, calcium carbonate 10-25 parts, talc 5-10 parts, foaming agent 1-2 parts, zinc oxide 0.5-1 part, masterbatch 0.5-1 part, internal lubricant 0.5-1 part, external lubricant 0.3-0.5 part.

[0024] Optionally, the foaming agent includes 4,4'-oxybisbenzenesulfonylhydrazide.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a preparation method of a slow-rebound TPE yoga mat. The method comprises the following steps: grinding the lower surface of the PU foam layer to form a rough surface on the lower surface of the PU foam layer. When an adhesive is coated on the lower surface of the PU foam layer, the adhesive has strong adhesion to the surface of the PU foam layer, so that the adhesive can effectively bond the PU foam layer and the TPE foam layer. Furthermore, corona treatment is performed on the surface of the TPE foam layer to form polar groups on the surface of the non-polar TPE foam layer, thereby facilitating the adhesive to wet and spread on the upper surface of the TPE foam layer. This method can overcome the problem that the TPE foam layer and the PU foam layer are difficult to bond due to the large difference in surface energy between the TPE foam layer and the PU foam layer, thereby making it easy to produce a yoga mat with a slow-rebound function, thereby solving the problem that the existing yoga mat has insufficient cushioning and support.

[0027] The present invention also provides a slow-rebound TPE yoga mat. By using both diethylenetriamine and ethylene glycolamine, two chain extenders, in the PU foam layer, the rigidity and flexibility of the polyurethane molecular chains in the PU foam layer are balanced. This allows the yoga mat containing the PU foam layer to slowly deform and absorb impact energy while also providing good support. Furthermore, by introducing stearic acid-modified nanosilica into the PU foam layer, when the TPE slow-rebound yoga mat is subjected to external force, the friction of the organic chain segments in the PU foam layer increases, converting more of the mechanical energy generated by the external force into heat energy, thereby extending the rebound time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention provides a flow chart of a method for preparing a slow-rebound TPE yoga mat.

[0029] Figure 2 The present invention is a flow chart of the preparation method of the stearic acid modified nano-silica. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] like Figure 1 As shown, the present invention provides a method for preparing a slow-rebound TPE yoga mat, wherein the slow-rebound TPE yoga mat includes a TPE foam layer and a PU foam layer (polyurethane layer) composited on the upper surface of the TPE foam layer; the preparation method includes the following steps:

[0032] S001. Use a grinder to polish the upper surface of the PU foam layer to increase the roughness of the lower surface of the PU foam layer;

[0033] In this step, the lower surface of the PU foam layer is polished to form a rough surface on the lower surface of the PU foam layer. The pore structure of the rough surface can absorb more adhesive, thereby enhancing the adhesion of the adhesive to the surface of the PU foam layer and the surface of the TPE foam layer. In this way, when the PU foam layer and the TPE foam layer are compounded by the adhesive, the PU foam layer and the TPE foam layer can be firmly bonded together.

[0034] S002. The surface of the TPE foam layer is subjected to corona treatment (power can be 3-5Kw, processing speed can be 5-10m / min) to break and oxidize the molecular chains on the upper surface of the TPE foam layer to form polar groups.

[0035] Since the main component of the TPE foam layer is an olefin polymer, and the molecular chain is mainly composed of a non-polar hydrocarbon structure, the surface energy of the TPE foam layer will be low, making it difficult for the adhesive to spread and wet. Therefore, in this step, the upper surface of the TPE foam layer is corona treated to form polar groups on the upper surface of the TPE foam layer, thereby helping the adhesive to wet and spread on the upper surface of the TPE foam layer, and the adhesive can effectively bond the PU foam layer and the TPE foam layer.

[0036] S003 using a roller coater to apply adhesive to the lower surface of the PU foam layer and the upper surface of the TPE foam layer; double-sided coating can enhance the bonding strength between the PU foam layer and the TPE foam layer compared to single-sided coating, making the PU foam layer not easily peeled off from the TPE foam layer;

[0037] S004 After gluing, the adhesive is dried to evaporate the solvent in the adhesive, forming a preliminary adhesive film, and then aligning the PU foam layer and the TPE foam layer and placing them into a hot pressing laminating machine to hot-press the PU foam layer onto the upper surface of the TPE foam layer;

[0038] S005. After the hot pressing lamination is completed, the laminated TPE slow rebound yoga mat is removed from the hot pressing laminating machine, and then the TPE slow rebound yoga mat is allowed to stand still to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify to achieve the best bonding strength and ensure that the PU foam layer and the TPE foam layer are firmly bonded.

[0039] It can be seen that in the preparation method provided by the present invention, the lower surface of the PU foam layer is polished to form a rough surface on the lower surface of the PU foam layer. When the adhesive is coated on the lower surface of the PU foam layer, the adhesive has strong adhesion to the surface of the PU foam layer, so that the adhesive can effectively bond the PU foam layer and the TPE foam layer; and by corona treatment of the surface of the TPE foam layer, polar groups can be formed on the surface of the non-polar TPE foam layer, which helps the adhesive to wet and spread on the upper surface of the TPE foam layer, and can overcome the problem of difficulty in bonding the TPE foam layer and the PU foam layer due to the large difference in surface energy between the TPE foam layer and the PU foam layer, so that the yoga mat with slow rebound function is easy to produce, thereby solving the problem of insufficient cushioning and support of existing yoga mats.

[0040] Optionally, in step S003, the adhesive may be. The water-based polyurethane adhesive has good compatibility with the surface of the PU foam layer and can form a strong chemical bond, so that the adhesive has strong adhesion to the surface of the PU foam layer, and the adhesive can effectively play the role of bonding the PU foam layer and the TPE foam layer. In addition, the water-based polyurethane adhesive uses water as a solvent, has good environmental protection, can reduce the emission of volatile organic compounds (VOCs), is good to the environment, conforms to the concept of green production, and can also reduce the odor of the decorative film, which meets the health and safety requirements of yoga mats. The water-based polyurethane adhesive is Refober PU-650 water-based polyurethane adhesive.

[0041] Optionally, in step S004, the PU foam layer and the TPE foam layer coated with the adhesive are placed in an oven at a temperature of 80 to 90° C. for 5 to 8 minutes to fully evaporate the water in the water-based polyurethane adhesive and form a preliminary film of the water-based polyurethane adhesive.

[0042] Optionally, in step S004, the temperature of the hot pressing composite is 120-160° C., the pressure is 0.5-1.5 MPa, and the holding time is 30-60 seconds.

[0043] When the temperature of hot pressing and laminating is controlled within the above temperature range, it can further promote the cross-linking reaction of the polymer in the film to form a denser cross-linking network, thereby enhancing the bonding strength between the PU foam layer and the TPE foam layer and improving the durability of the adhesive. At the same time, the above temperature range allows the surfaces of the PU foam layer and the TPE layer to fully melt without causing thermal degradation. While better fusing the surfaces of the PU foam layer and the TPE foam layer, it can also prevent the TPE slow rebound yoga mat from yellowing and degradation of mechanical properties.

[0044] When the hot pressing pressure is controlled within the above range, the film is compressed to fill the gaps between the PU and TPE foam layers, thereby increasing the actual contact area between the adhesive, the PU and TPE foam layers, and ensuring a strong bond between the PU and TPE foam layers. When the holding time is controlled within the above range, the surfaces of the PU and TPE foam layers are fully fused, while the polymers in the film have sufficient time to undergo cross-linking reactions, forming a denser cross-linked network.

[0045] The present invention also provides a slow-rebound TPE yoga mat, which is made by the aforementioned preparation method of the slow-rebound TPE yoga mat, and the PU foam layer comprises the following components in parts by weight:

[0046] 70-80 parts of polyether polyol, 20-25 parts of isocyanate, 4-6 parts of chain extender, 1-2 parts of water, 1-1.5 parts of pore opener, 0.5-1 part of color paste, 0.1-0.3 parts of ammonium catalyst, and 0.05-0.1 parts of tin catalyst. The isocyanate includes at least one of toluene diisocyanate and isophorone diisocyanate.

[0047] Specifically, polyether polyol, as the main soft segment of the PU foam layer, imparts flexibility and ductility to the PU foam layer, thereby providing excellent slow-rebound properties. When the PU foam layer is laminated onto the TPE foam layer, the surface of the yoga mat possesses cushioning properties, absorbing impact forces on the joints and effectively protecting them. The isocyanate groups in the isocyanate react with the hydroxyl groups in the polyether polyol to form urethane bonds, forming the main hard segments of the PU foam layer. This provides mechanical strength, thereby enhancing the support, stability, tear resistance, and durability of the yoga mat. Chain extenders extend the polyurethane molecular chains and increase the crosslink density, thereby improving the mechanical strength, elasticity, and dimensional stability of the PU foam layer. The cell opener can be the slow-rebound cell opener BDM-1, which effectively prevents shrinkage of the PU foam layer while imparting an excellent hand feel. The ammonium catalyst can be Dabco 33-LV. The catalyst Dabco33-LV promotes the reaction between isocyanate and water and the foaming of the PU foam layer while also reducing the risk of closed cells and excessive softness in the PU foam layer, ensuring good slow rebound properties. The tin catalyst can be dibutyltin dilaurate, which promotes the cross-linking reaction between isocyanate and polyether polyol.

[0048] Optionally, the average molecular weight of the polyether polyol is 3000 to 3500. When the average molecular weight of the polyether polyol is on the low side, the length of the chain segment is short, and the flexibility and ductility provided are insufficient, which will lead to poor slow rebound performance of the PU foam layer, and the mechanical strength of the PU foam layer will also be affected. When the average molecular weight of the polyether polyol is on the high side, the melt viscosity of the polyether polyol will increase, and when reacting with other raw materials such as isocyanate, the difficulty of mixing processing will increase, which is not conducive to forming a uniform PU foam layer structure. Therefore, the present invention controls the average molecular weight of the polyether polyol to 3000 to 3500, which can not only ensure that the PU foam layer has sufficient flexibility to achieve a slow rebound effect, but also improve the necessary mechanical strength for the PU foam layer.

[0049] Optionally, the polyether polyol may be commercially available YUKOL 5613 polyether polyol.

[0050] Optionally, the chain extender includes diethylenetriamine and ethylene glycolamine. Among them, the molecular structure of diethylenetriamine contains amino and imine groups, which can undergo a multi-crosslinking reaction with isocyanate, increase the hard segment ratio in the PU foam layer, and enhance the support of the slow rebound TPE yoga mat; while the molecular structure of ethylene glycolamine contains amino and hydroxyl groups. The amino group reacts with isocyanate to form a urea bond (-NH-CO-NH-), and the hydroxyl group reacts with isocyanate to form a carbamate bond (-NH-CO-O-), extending the molecular chain length, thereby retaining the flexibility of the soft segment of the PU foam layer. The simultaneous use of diethylenetriamine and ethylene glycolamine allows the PU foam layer to slowly deform and absorb impact when under pressure, while ensuring sufficient structural strength, so that the TPE slow rebound yoga mat can resist collapse.

[0051] Optionally, the ratio of diethylenetriamine and ethylene glycolamine in parts by weight is 3:2. The present invention has found that when the amount of diethylenetriamine is too much or only diethylenetriamine is used, the cross-linking density of the polyurethane molecular chain increases, which will cause the PU foam layer to be hard and the slow rebound performance of the PU foam layer to decrease; while when the amount of ethylene glycolamine is too much or only ethylene glycolamine is used, the cross-linking density of the polyurethane molecular chain is not significantly improved, and ethylene glycolamine mainly plays the role of extending the length of the molecular chain and improving the flexibility of the material. It cannot guarantee the structural strength of the slow rebound TPE yoga mat, and the yoga mat is easily deformed during use. Therefore, the present invention controls the ratio of diethylenetriamine and ethylene glycolamine in parts by weight to the above ratio, which can balance the rigidity and flexibility of the polyurethane molecular chain by reducing the cross-linking density of the polyurethane molecular chain and introducing flexible chain segments, so that the yoga mat containing the PU foam layer can slowly deform and absorb impact energy while also having good support.

[0052] Optionally, the PU foam layer also includes the following components in parts by weight: 3-4 parts of stearic acid-modified nano-silica. The surface of the stearic acid-modified nano-silica has a lipophilic long-chain alkyl group, which can adsorb the organic chain segments in the PU foam layer through van der Waals forces, thereby forming a "binding layer" that restricts the free movement of the polyurethane molecular segments. When the TPE slow rebound yoga mat is subjected to external force, the friction of the organic chain segments in the PU foam layer increases, causing more of the mechanical energy generated by the external force to be converted into heat energy, thereby extending the rebound time.

[0053] Moreover, since the modified nano-silica is modified by stearic acid, the modified nano-silica can be evenly dispersed in the PU foam layer, which can share the stress on the PU foam layer, thereby improving the mechanical properties of the TPE slow rebound yoga mat, such as tensile strength and wear resistance.

[0054] Optionally, the preparation method of the stearic acid-modified nanosilica comprises the following steps:

[0055] Y001. Stearic acid was mixed with anhydrous ethanol solution to obtain a mixed solution;

[0056] Y002. Mix nano-silica with a particle size of 20 to 30 nm with the mixed solution to uniformly disperse the nano-silica in the mixed solution, and then keep it warm in a water bath to completely evaporate the anhydrous ethanol to obtain the stearic acid-modified nano-silica; the ratio of the nano-silica to stearic acid in parts by weight is (20 to 25):1.

[0057] Optionally, the TPE foam layer comprises the following components in parts by weight:

[0058] Thermoplastic elastomer TPE 60-70 parts, polypropylene 20-30 parts, white oil 15-25 parts, calcium carbonate 10-25 parts, talc 5-10 parts, foaming agent 1-2 parts, zinc oxide 0.5-1 part, masterbatch 0.5-1 part, internal lubricant 0.5-1 part, external lubricant 0.3-0.5 part.

[0059] Specifically, the thermoplastic elastomer can be an SBS elastomer (styrene-polybutadiene-polystyrene triblock copolymer) or a hydrogenated SBS elastomer. As the base material of the TPE foam layer, it can provide elasticity and flexibility to the TPE foam layer, and work synergistically with the PU foam layer to form a composite yoga mat structure with "lower layer support and upper layer cushioning". Polypropylene can make up for the deficiency of thermoplastic elastomer TPE in improving the tensile strength of the TPE foam layer, and can make the bottom layer of the yoga mat less likely to tear. Moreover, the melt viscosity of polypropylene is lower than that of thermoplastic elastomer. After being blended with thermoplastic elastomer, it can reduce the overall viscosity of the system, and can enable the TPE foam layer to form a uniform pore structure, avoiding insufficient elasticity or decreased load-bearing capacity caused by large pores. In addition, polypropylene particles, as physical cross-linking points, can limit the transition slip of molecular chains in the TPE foam layer, thereby extending the deformation recovery time of the TPE foam layer, making the TPE slow rebound yoga mat have slow rebound elasticity. The white oil is KN4006, which acts as a physical plasticizer to reduce the hardness of the TPE foam layer and improve its softness. This prevents the TPE layer from being too hard, preventing the PU foam layer from being limited by excessively strong (highly hard) support from the underlying layer, and thus meeting the cushioning requirements of yoga mats. The calcium carbonate can increase the density, dimensional stability, and wear resistance of the TPE foam layer. The talc can enhance the tear resistance of the TPE foam layer. The internal lubricant can be glyceryl stearate, which can reduce the internal friction between polymer molecular chains, improve melt fluidity, and promote the dispersion of fillers such as calcium carbonate and talc, avoiding a surge in system viscosity due to excessive fillers and ensuring smooth processing. The external lubricant can be stearic acid, which reduces the interfacial friction between the polymer and the processing equipment. During the production of TPE yoga mats, it prevents the TPE melt from sticking to the mold and ensures a smooth, scratch-free surface of the foamed product. The gas produced by the decomposition of the foaming agent can form a cellular structure within the TPE foam layer, giving the TPE foam layer better softness and elasticity. Zinc oxide can lower the foaming decomposition temperature, increase the gas release rate, and make the foaming more uniform.

[0060] Optionally, the foaming agent includes 4,4'-oxybisbenzenesulfonylhydrazine. During the foaming process, 4,4'-oxybisbenzenesulfonylhydrazine can quickly decompose and produce gas, which allows the gas to nucleate more evenly in the polymer matrix, laying the foundation for the formation of a uniform and fine pore structure, helping to improve the slow rebound performance of the TPE foam layer, and further enhancing the impact cushioning ability of the TPE slow rebound yoga mat.

[0061] The present invention also provides a method for preparing a PU foam layer, comprising the following steps:

[0062] Add polyether polyol to a stirring tank, control the temperature of the stirring tank to 80-90°C, then add isocyanate to the stirring tank, and stir for 2-3 hours to form a prepolymer;

[0063] Add chain extender, stearic acid modified nano-silica, water, pore opener, color paste, ammonium catalyst, and tin catalyst to the prepolymer in sequence, and stir at high speed (1000-1500 r / min) for 1-2 minutes to fully mix the components to form a foaming slurry;

[0064] Pour the foaming slurry into the mold quickly, control the ambient temperature at 25-30°C, and allow the foaming slurry to foam and expand in the mold to form a PU foam layer body;

[0065] The mold and the green body are placed in a curing box and cured at 60-80° C. for 12-24 hours to obtain a PU foam layer.

[0066] The present invention also provides a method for preparing a TPE foam layer, comprising the following steps:

[0067] Add thermoplastic elastomer TPE, polypropylene and white oil into a high-speed mixer and premix at 60-80°C for 10-15 minutes to allow the white oil to fully penetrate into the polymer matrix.

[0068] Add calcium carbonate, talc, and masterbatch to the high-speed mixer in sequence and continue mixing for 5 to 8 minutes to ensure uniform dispersion of the fillers. Add the foaming agent, zinc oxide, internal lubricant, and external lubricant and mix at low speed for 3 to 5 minutes to prevent premature decomposition of the foaming agent.

[0069] The uniformly mixed materials are fed into a twin-screw extruder, and the extruder temperature is controlled at 140-170°C (feeding section 140-150°C, melting section 150-160°C, extrusion section 160-170°C), and the screw speed is 30-50 r / min to fully melt and blend the materials.

[0070] After the blended material is extruded through the extruder head, it enters the foaming mold and is foamed in the mold by controlling the temperature (80-100°C) and pressure (0.3-0.8MPa) to form a TPE foam layer with a uniform pore structure.

[0071] The foamed TPE layer is cooled and shaped by a cooling roller group (the temperature is controlled at 15-25°C), and then cut to the required size for use.

[0072] In order to further illustrate the slow rebound TPE yoga mat and its preparation method provided by the present invention, the following examples and comparative examples are provided.

[0073] Example 1

[0074] This embodiment provides a method for preparing a slow-rebound TPE yoga mat, comprising the following steps:

[0075] S001. Use a grinder to polish the upper surface of the PU foam layer;

[0076] S002. The surface of the TPE foam layer was corona treated, the corona power was 3Kw, and the processing speed was 5m / min;

[0077] S003 using a roller coater to apply a water-based polyurethane adhesive to the lower surface of the PU foam layer and the upper surface of the TPE foam layer;

[0078] S004. After gluing, the adhesive-coated PU foam layer and TPE foam layer were placed in an oven at 80 ° C for 5 minutes, and then the PU foam layer and TPE foam layer were aligned and placed in a hot press laminating machine to hot press the PU foam layer on the upper surface of the TPE foam layer. The hot press lamination temperature was 120 ° C, the pressure was 0.5 MPa, and the holding time was 30 seconds.

[0079] S005. After the hot pressing is completed, the yoga mat is left to stand to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify.

[0080] This embodiment also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this embodiment, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0081] 70 parts of polyether polyol with an average molecular weight of 3000, 20 parts of toluene diisocyanate, 3 parts of stearic acid modified nano-silica; 2.4 parts of diethylenetriamine, 1.6 parts of ethylene glycolamine, 1 part of water, 1 part of pore opener, 0.5 parts of color paste, 0.1 parts of ammonium catalyst, and 0.05 parts of tin catalyst.

[0082] The raw materials for preparing the TPE foam layer are composed of the following raw materials in parts by weight:

[0083] 60 parts of thermoplastic elastomer TPE (SBS elastomer), 20 parts of polypropylene, 15 parts of white oil, 10 parts of calcium carbonate, 5 parts of talc, 1 part of 4,4'-oxybisbenzenesulfonylhydrazine, 0.5 parts of zinc oxide, 0.5 parts of masterbatch, 0.5 parts of internal lubricant, and 0.3 parts of external lubricant.

[0084] Example 2

[0085] This embodiment provides a method for preparing a slow-rebound TPE yoga mat, comprising the following steps:

[0086] S001. Use a grinder to polish the upper surface of the PU foam layer;

[0087] S002. The surface of the TPE foam layer was corona treated, the corona power was 5Kw, and the processing speed was 10m / min;

[0088] S003 using a roller coater to apply a water-based polyurethane adhesive to the lower surface of the PU foam layer and the upper surface of the TPE foam layer;

[0089] S004. After gluing, the adhesive-coated PU foam layer and TPE foam layer were placed in an oven at 90 ° C for 8 minutes, and then the PU foam layer and TPE foam layer were aligned and placed in a hot press laminating machine to hot press the PU foam layer on the upper surface of the TPE foam layer. The hot press lamination temperature was 160 ° C, the pressure was 1.5 MPa, and the holding time was 60 seconds.

[0090] S005. After the hot pressing is completed, the yoga mat is left to stand to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify.

[0091] This embodiment also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this embodiment, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0092] 80 parts of polyether polyol with an average molecular weight of 3000, 25 parts of isophorone diisocyanate, 4 parts of stearic acid-modified nano-silica; 3.6 parts of diethylenetriamine, 2.4 parts of ethylene glycolamine, 2 parts of water, 1.5 parts of pore opener, 1 part of color paste, 0.3 parts of ammonium catalyst, and 0.1 parts of tin catalyst.

[0093] The raw materials for preparing the TPE foam layer are composed of the following raw materials in parts by weight:

[0094] 70 parts of thermoplastic elastomer TPE (SBS elastomer), 30 parts of polypropylene, 25 parts of white oil, 25 parts of calcium carbonate, 10 parts of talc, 2 parts of 4,4'-oxybisbenzenesulfonylhydrazine, 1 part of zinc oxide, 1 part of masterbatch, 1 part of internal lubricant, and 0.5 parts of external lubricant.

[0095] Example 3

[0096] This embodiment provides a method for preparing a slow-rebound TPE yoga mat, comprising the following steps:

[0097] S001. Use a grinder to polish the upper surface of the PU foam layer;

[0098] S002. The surface of the TPE foam layer was corona treated, the corona power was 4Kw, and the processing speed was 8m / min;

[0099] S003 using a roller coater to apply a water-based polyurethane adhesive to the lower surface of the PU foam layer and the upper surface of the TPE foam layer;

[0100] S004. After gluing, the adhesive-coated PU foam layer and TPE foam layer were placed in an oven at 85 ° C for 6 minutes, and then the PU foam layer and TPE foam layer were aligned and placed in a hot press laminating machine to hot press the PU foam layer on the upper surface of the TPE foam layer. The hot press temperature was 140 ° C, the pressure was 1.0 MPa, and the holding time was 45 seconds.

[0101] S005. After the hot pressing is completed, the yoga mat is left to stand to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify.

[0102] This embodiment also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this embodiment, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0103] 75 parts of polyether polyol with an average molecular weight of 3000, 25 parts of toluene diisocyanate, 3.5 parts of stearic acid modified nano-silica; 3.6 parts of diethylenetriamine, 2.4 parts of ethylene glycolamine, 2 parts of water, 1.5 parts of pore opener, 1 part of color paste, 0.3 parts of ammonium catalyst, and 0.1 parts of tin catalyst.

[0104] The raw materials for preparing the TPE foam layer are composed of the following raw materials in parts by weight:

[0105] 65 parts of thermoplastic elastomer TPE (SBS elastomer), 25 parts of polypropylene, 20 parts of white oil, 20 parts of calcium carbonate, 8 parts of talc, 2 parts of 4,4'-oxybisbenzenesulfonylhydrazine, 1 part of zinc oxide, 1 part of masterbatch, 1 part of internal lubricant, and 0.5 parts of external lubricant.

[0106] Comparative Example 1

[0107] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the preparation method provided in Example 1.

[0108] This comparative example also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this comparative example, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0109] 70 parts of polyether polyol with an average molecular weight of 2000 (brand: Pachong Y 220), 20 parts of toluene diisocyanate, 3 parts of stearic acid-modified nano-silica; 2.4 parts of diethylenetriamine, 1.6 parts of ethylene glycolamine, 1 part of water, 1 part of pore opener, 0.5 parts of color paste, 0.1 parts of ammonium catalyst, and 0.05 parts of tin catalyst.

[0110] The composition of the TPE foam layer is the same as that in Example 1.

[0111] Comparative Example 2

[0112] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the preparation method provided in Example 1.

[0113] This comparative example also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this comparative example, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0114] Polyether polyol with an average molecular weight of 3000, 20 parts of toluene diisocyanate, 3 parts of stearic acid-modified nano-silica; 3.0 parts of diethylenetriamine, 1.0 part of ethylene glycolamine, 1 part of water, 1 part of pore opener, 0.5 parts of color paste, 0.1 parts of ammonium catalyst, and 0.05 parts of tin catalyst.

[0115] The composition of the TPE foam layer is the same as that in Example 1.

[0116] Comparative Example 3

[0117] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the preparation method provided in Example 1.

[0118] This comparative example also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this comparative example, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0119] Polyether polyol with an average molecular weight of 3000, 20 parts of toluene diisocyanate, 3 parts of stearic acid modified nano-silica; 1.6 parts of diethylenetriamine, 2.4 parts of ethylene glycolamine, 1 part of water, 1 part of pore opener, 0.5 parts of color paste, 0.1 parts of ammonium catalyst, and 0.05 parts of tin catalyst.

[0120] The composition of the TPE foam layer is the same as that in Example 1.

[0121] Comparative Example 4

[0122] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the preparation method provided in Example 1.

[0123] This comparative example also provides a slow rebound TPE yoga mat, which is made by the above-mentioned preparation method. In this comparative example, the raw materials for preparing the PU foam layer are composed of the following raw materials in parts by weight:

[0124] 70 parts of polyether polyol with an average molecular weight of 3000, 20 parts of toluene diisocyanate, 2.4 parts of diethylenetriamine, 1.6 parts of ethylene glycolamine, 1 part of water, 1 part of pore opener, 0.5 parts of color paste, 0.1 parts of ammonium catalyst, and 0.05 parts of tin catalyst.

[0125] The composition of the TPE foam layer is the same as that in Example 1.

[0126] Comparative Example 5

[0127] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the method provided in Example 1. In this comparative example, the composition of the PU foam layer is the same as that in Example 1.

[0128] The raw materials for preparing the TPE foam layer are composed of the following raw materials in parts by weight:

[0129] 80 parts of thermoplastic elastomer TPE (SBS elastomer), 15 parts of white oil, 10 parts of calcium carbonate, 5 parts of talc, 1 part of 4,4'-oxybisbenzenesulfonylhydrazine, 0.5 parts of zinc oxide, 0.5 parts of masterbatch, 0.5 parts of internal lubricant, and 0.3 parts of external lubricant.

[0130] Comparative Example 6

[0131] This comparative example provides a method for preparing a slow-rebound TPE yoga mat, which is the same as the method provided in Example 1. In this comparative example, the composition of the PU foam layer is the same as that in Example 1.

[0132] The raw materials for preparing the TPE foam layer are composed of the following raw materials in parts by weight:

[0133] 60 parts of thermoplastic elastomer TPE (SBS elastomer), 20 parts of polypropylene, 15 parts of white oil, 10 parts of calcium carbonate, 5 parts of talc, 1 part of azodicarbonamide, 0.5 parts of zinc oxide, 0.5 parts of masterbatch, 0.5 parts of internal lubricant, and 0.3 parts of external lubricant.

[0134] The rebound performance of the slow rebound TPE yoga mats provided in Examples 1 to 3 and Comparative Examples 1 to 6 was tested respectively, and the test results are shown in the following table:

[0135]

[0136] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing a slow-rebound TPE yoga mat, characterized in that: The slow-rebound TPE yoga mat includes a TPE foam layer and a PU foam layer composited on the upper surface of the TPE foam layer; the preparation method includes the following steps: S001. Polish the surface of the PU foam layer to increase the roughness of the lower surface of the PU foam layer to form a mechanical bite point; S002. The surface of the TPE foam layer is corona treated to form polar groups on the upper surface of the TPE foam layer; S003 respectively, coating the adhesive on the lower surface of the PU foam layer and the upper surface of the TPE foam layer; S004 After gluing, the adhesive is dried, and then the PU foam layer and the TPE foam layer are placed in a hot pressing laminating machine, so that the PU foam layer is hot pressed and composited on the upper surface of the TPE foam layer; S005. After the hot pressing is completed, the yoga mat is left to stand to allow the adhesive between the PU foam layer and the TPE foam layer to fully solidify.

2. The method for preparing a slow-rebound TPE yoga mat according to claim 1, characterized in that: In step S003, the adhesive includes a water-based polyurethane adhesive.

3. The method for preparing a slow-rebound TPE yoga mat according to claim 1, characterized in that: In step S004 , the temperature of the hot pressing composite is 120-160° C., the pressure is 0.5-1.5 MPa, and the holding time is 30-60 seconds.

4. A slow rebound TPE yoga mat, characterized in that: The slow-rebound TPE yoga mat is made by the preparation method of the slow-rebound TPE yoga mat according to any one of claims 1 to 3, and the PU foam layer comprises the following components in parts by weight: 70-80 parts of polyether polyol, 20-25 parts of isocyanate, 4-6 parts of chain extender, 1-2 parts of water, 1-1.5 parts of pore opener, 0.5-1 part of color paste, 0.1-0.3 parts of ammonium catalyst, and 0.05-0.1 parts of tin catalyst.

5. The slow rebound TPE yoga mat according to claim 4, characterized in that: The average molecular weight of the polyether polyol is 3000-3500.

6. The slow rebound TPE yoga mat according to claim 4, characterized in that: The chain extender comprises diethylenetriamine and ethylene glycol amine, and the ratio of the diethylenetriamine to the ethylene glycol amine is 3:2 in parts by weight.

7. The slow rebound TPE yoga mat according to claim 4, characterized in that: The PU foaming layer further comprises the following components in parts by weight: 3 to 4 parts of stearic acid modified nano-silicon dioxide.

8. The slow rebound TPE yoga mat according to claim 7, characterized in that: The preparation method of stearic acid modified nanosilica comprises the following steps: Y001. Stearic acid was mixed with anhydrous ethanol solution to obtain a mixed solution; Y002. Mixing the nano-silica with the mixed solution to uniformly disperse the nano-silica in the mixed solution, and then heat-insulating to obtain the stearic acid-modified nano-silica.

9. The slow rebound TPE yoga mat according to claim 1, characterized in that: The TPE foam layer comprises the following components in parts by weight: Thermoplastic elastomer TPE 60-70 parts, polypropylene 20-30 parts, white oil 15-25 parts, calcium carbonate 10-25 parts, talc 5-10 parts, foaming agent 1-2 parts, zinc oxide 0.5-1 part, masterbatch 0.5-1 part, internal lubricant 0.5-1 part, external lubricant 0.3-0.5 part.

10. The slow rebound TPE yoga mat according to claim 9, characterized in that: The foaming agent includes 4,4'-oxybisbenzenesulfonylhydrazide.

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