Dimensionally stable sports flooring and production method thereof

Abstract

The present invention discloses a dimensionally stable sports flooring, comprising a wear-resistant surface layer, a pressure-resistant reinforcement layer, and an elastic foam layer stacked sequentially from top to bottom. The wear-resistant surface layer comprises a densely woven fabric layer and a wear-resistant plastic layer located on one side of the densely woven fabric layer and composited with the densely woven fabric layer via its own melt. The wear-resistant surface layer of the dimensionally stable sports flooring comprises a densely woven fabric layer. The composite structure of the densely woven fabric layer, the wear-resistant plastic layer, and the pressure-resistant reinforcement layer improves the dimensional stability of the multi-layered plastic flooring, particularly the dimensional stability of the highly elastic, wear-resistant plastic layer. The present invention also discloses a method for producing dimensionally stable sports flooring.

Description

Technical Field

[0001] The present invention relates to the technical field of sports flooring, and in particular to a dimensionally stable sports flooring and a production method thereof. Background Art

[0002] Flooring is a lightweight floor covering material with a multi-layer composite structure. Its basic structure, from top to bottom, consists of a wear-resistant surface layer, a pressure-resistant reinforcement layer, and an elastic foam layer. The wear-resistant surface layer is often made of a highly elastic polymer material, such as PVC or TPU. The pressure-resistant reinforcement layer typically includes a fiberglass stabilization layer to stabilize the flooring's dimensions. The fiberglass stabilization layer in the pressure-resistant reinforcement layer utilizes a relatively porous fiberglass mesh; a single layer of mesh has limited effectiveness in enhancing the flooring's dimensional stability.

[0003] The improved technical solution, as described in CN205134867U, includes a wear-resistant surface layer, a glass fiber layer, a densely woven fabric mesh layer, an antibacterial and mildew-proof layer, and a buffer layer from top to bottom. The glass fiber layer and the densely woven fabric mesh layer are bonded together using the wear-resistant surface layer, the antibacterial and mildew-proof layer, or other adhesives. The material interface attachment structure has poor durability and is prone to interlayer peeling and bulging after long-term use. In flooring with more layer structures, the stacking of glass fiber layers and densely woven fabric mesh layers is also not conducive to balancing the dimensional stability of each layer in the thickness direction of the flooring. Summary of the Invention

[0004] One of the purposes of the present invention is to overcome the defects existing in the prior art and provide a dimensionally stable sports flooring. By arranging a densely woven fabric layer in the wear-resistant layer, the tensile strength and dimensional stability of the flooring product are greatly improved while maintaining the high elasticity and wear resistance of the flooring surface.

[0005] In order to achieve the above technical effects, the technical solution of the present invention is: a dimensionally stable sports flooring, comprising a wear-resistant surface layer, a pressure-resistant reinforcement layer and an elastic foam layer stacked in sequence from the surface to the bottom, the wear-resistant surface layer comprising a densely woven fabric layer, a wear-resistant plastic layer located on one side of the densely woven fabric layer and composited with the densely woven fabric layer through its own melt.

[0006] A preferred technical solution is that the pressure-resistant reinforcement layer comprises a pressure-resistant plastic layer connected to the densely woven fabric layer, wherein the densely woven fabric layer and the pressure-resistant plastic layer are compositely connected via an adhesive layer. Furthermore, a mesh stabilization layer is provided on the other surface of the pressure-resistant plastic layer.

[0007] A second object of the present invention is to provide a method for producing dimensionally stable sports flooring, comprising the following steps:

[0008] S1: Casting a wear-resistant plastic layer melt on one surface of the densely woven fabric layer, heat-rolling, then heating and embossing the wear-resistant plastic layer, and cooling to obtain a wear-resistant surface layer;

[0009] S2: A composite bottom layer with a pressure-resistant reinforcement layer and an elastic foam layer;

[0010] S3: Apply adhesive to the other surface of the densely woven fabric layer in the wear-resistant surface layer, and heat the wear-resistant surface layer and the composite bottom layer until they are bonded and composited.

[0011] The preferred technical solution is that the material of the wear-resistant surface layer is TPU, the surface base resin of the pressure-resistant reinforcement layer connected to the adhesive layer is PVC, and the adhesive is a water-based polyurethane adhesive.

[0012] The preferred technical solution is that in S1, the TPU casting temperature is 133-143°C; the roller temperature for rolling and embossing is 133-143°C, and the roller pressure is 18-25 kg. Furthermore, the casting temperature is 137-143°C, the roller temperature for rolling is 137-143°C, and the roller pressure is 19-23 kg; and the roller temperature for embossing is 133-137°C, and the roller pressure is 20-25 kg.

[0013] Based on the above process temperature and pressure, the melt index of TPU is 40-50 g / 10 min, 200° C. / 2.16 kg, preferably 136-155 g / 10 min, 200° C. / 2.16 kg.

[0014] The preferred technical solution is that the densely woven fabric is a polyester fiber densely woven fabric, the number of warp yarns and weft yarns per square inch of the polyester fiber densely woven fabric is 43 to 52; the gram weight of the polyester fiber densely woven fabric is 220 to 270 g / m 2 Furthermore, the weight of polyester densely woven fabric is 235-260g / m 2 .

[0015] The preferred technical solution is that the main components of the adhesive in S3 are: water-based polyurethane emulsion, crosslinking agent, leveling agent, carboxylate anion wetting agent; the solid content of the water-based polyurethane emulsion is 35% to 50%;

[0016] The mass of the crosslinking agent is 0.5% to 3.5% of the solid content in the waterborne polyurethane emulsion; the mass of the leveling agent is 0.1% to 2% of the solid content in the waterborne polyurethane emulsion; and the mass of the carboxylate anion wetting agent is 0.1% to 2% of the solid content in the waterborne polyurethane emulsion.

[0017] A preferred technical solution is that the crosslinking agent is aminopropylamine; further, the adhesive also includes dodecyldiethanolamine and / or decyldiethanolamine in an amount of 0.05% to 0.3% of the solid content of the aqueous polyurethane emulsion. Furthermore, the mass of the crosslinking agent is 2% to 2.7% of the solid content of the aqueous polyurethane emulsion. Furthermore, the dodecyldiethanolamine and / or decyldiethanolamine in an amount of 0.15% to 0.25% of the solid content of the aqueous polyurethane emulsion is preferably present.

[0018] The preferred technical solution is that the composite temperature of the wear-resistant surface layer is 115-125°C, the composite bottom layer is 135-147°C, and the composite pressure is 11-18 kg. Furthermore, the composite temperature of the wear-resistant surface layer is 117-123°C, the composite bottom layer is 138-144°C, and the composite pressure is 13-17 kg.

[0019] The preferred technical solution is that the waterborne polyurethane in the waterborne polyurethane emulsion is prepared by reacting isophorone diisocyanate as isocyanate, diacid-type polyester polyol as polyol, organic tin as catalyst, and 1,4-butanediol as small molecule polyol;

[0020] The hydroxyl value of the diacid polyester polyol is 55-57 mgKOH / g, the R value of the isocyanate and the polyol is 1.3-1.4, and the addition amount of the small molecule polyol is 3%-4% of the sum of the mass of the isocyanate and the polyol; the reaction temperature is 65-85°C;

[0021] The neutralizing agent for waterborne polyurethane is triethylamine.

[0022] The advantages and beneficial effects of the present invention are:

[0023] The wear-resistant surface layer of the dimensionally stable sports flooring includes a densely woven fabric layer. The composite structure of the densely woven fabric layer, the wear-resistant plastic layer, and the pressure-resistant reinforcement layer is used to improve the dimensional stability of the flooring including multiple layers of plastic, especially the dimensional stability of the highly elastic and wear-resistant plastic layer.

[0024] The wear-resistant plastic layer is connected to the densely woven fabric layer through its own melt. The melt is more embedded between the fibers of the densely woven fabric layer, thereby improving the peeling strength between the densely woven fabric and the surface layer, avoiding the use of additional adhesives and the subsequent aging of the adhesives, which may cause VOC emissions, insufficient peeling strength, bulging due to heat, and other problems.

[0025] The production method of dimensionally stable sports flooring has reasonable steps. The rolling operation after casting is conducive to pressing the viscous melt into the spaces between the fibers of the densely woven fabric layer. The production process of first casting, rolling, embossing and then bonding and laminating can effectively improve the peel strength between the densely woven fabric and the adjacent plastic layer, especially when the densely woven fabric has a high warp and weft density. DETAILED DESCRIPTION

[0026] The following examples are only used to illustrate the technical solution of the present invention more clearly, and are not intended to limit the scope of protection of the present invention.

[0027] densely woven fabric

[0028] Closely woven fabric differs from the mesh commonly used in floor coverings, such as fiberglass mesh. This mesh has distinct openings, allowing the plastic material on either side to pass through and connect the layers, creating a mesh embedded within the two plastic layers. The mesh serves as a framework for the plastic layers. Closely woven fabric lacks visible openings, making it more susceptible to air bubbles forming at the composite interface when gluing thin, wear-resistant plastic layers.

[0029] When the layers of flooring are heated and laminated, the plastic or adhesive interface becomes viscous and fluid, causing bubbles to expand, further leading to poor adhesion. The wear-resistant plastic layer of the flooring has enhanced friction, and after prolonged use, poor adhesion is further magnified by frictional deformation of the surface layer, ultimately forming bulges in the flooring.

[0030] The wear-resistant plastic layer is bonded to the densely woven fabric through its own melt, which can be selected by thermal lamination and casting. Compared with thermal lamination, the viscous melt with good fluidity fits the surface of the densely woven fabric more fully, and there are fewer bubbles at the interface between the cast layer and the densely woven fabric before rolling.

[0031] Based on the composite structure of the cast film layer and the densely woven fabric, the pressure-resistant plastic layer and the densely woven fabric are preferably bonded together via an adhesive layer to further reduce poor bonding at the interface between the pressure-resistant plastic layer and the densely woven fabric. Furthermore, the adhesive material of the adhesive layer is first applied to the surface of the densely woven fabric, and then the wear-resistant surface layer with the adhesive layer is bonded to the pressure-resistant plastic layer. The adhesive has excellent wetting properties on the densely woven fabric, displacing air and fully penetrating between the fibers of the densely woven fabric, forming a larger bonding interface between the fibers of the densely woven fabric, which further helps to improve the peel strength between the pressure-resistant plastic layer and the densely woven fabric.

[0032] For densely woven fabrics, the appropriate warp and weft density and weight must be selected. Based on a fixed warp and weft density, the weight is directly related to the warp and weft spinning diameter of the densely woven fabric. If the warp and weft density of the densely woven fabric is too small, the fabric surface will have larger meshes, making it easier for air and viscous plastic to pass through the meshes. Rolling after casting will cause excessive plastic to pass through the meshes and be pressed onto the non-cast surface of the densely woven fabric, which is not conducive to producing a wear-resistant plastic layer of the predetermined thickness. If the warp and weft density of the densely woven fabric is too large, the pressurized and clamped fabric surface will be too tight, making it more difficult for airflow to penetrate the densely woven fabric during rolling, which is not conducive to further reducing the amount of bubbles at the wear-resistant plastic layer / densely woven fabric interface through rolling.

[0033] The wear-resistant plastic is calendered and partially covered on the non-cast surface of the densely woven fabric, which is not conducive to the full wetting of the adhesive into the densely woven fabric, especially the wear-resistant plastic covered area, which has a further adverse effect on the peel strength between the pressure-resistant plastic layer and the densely woven fabric.

[0034] Other factors affecting the formation of local coverage of wear-resistant plastic on the non-cast surface of densely woven fabric

[0035] In addition to the warp and weft density and weight of the densely woven fabric, the viscosity of the wear-resistant plastic in its fluid state, the roller pressure, and the temperature of the wear-resistant plastic cast layer during rolling also affect the composite effect of the wear-resistant plastic layer and the densely woven fabric. In addition, the composite base layer is produced independently of the wear-resistant surface layer to prevent the excessively high drying and curing temperatures during the composite base layer production process from affecting the adhesion interface between the wear-resistant surface layers.

[0036] It is understood that in some embodiments, the pressure-resistant reinforcement layer includes a stabilizing layer, such as a fiberglass mesh, which is laminated between the wear-resistant surface layer and the elastic foam layer. Based on the aforementioned fiberglass mesh, the preferred pressure-resistant reinforcement layer structure is as follows: pressure-resistant layers are provided on opposite surfaces of the stabilizing layer in the thickness direction, such as the conventional PVC pressure-resistant layer used in flooring. The resin base material of the elastic foam layer can be selected from the same material as the pressure-resistant layer to further enhance the peel strength between the pressure-resistant reinforcement layer and the elastic foam layer, thereby reducing the use of interlayer adhesive.

[0037] Production method of floor glue:

[0038] 1. Prepare polyurethane adhesive

[0039] Under the protection of dry nitrogen, isophorone diisocyanate and vacuum-dehydrated adipic acid polyester polyol (hydroxyl value of 55-57 mgKOH / g) were added to a reaction vessel according to an R value of 1.3, mixed and heated to 85°C for 2 hours, and the reaction was cooled to 65°C. 1,4-butanediol (3% by mass of the total mass of the isocyanate and polyol) and dibutyltin dilaurate (2‰ by mass of the total mass of the isocyanate and polyol) were added and reacted for 3 hours. When the viscosity of the reaction system was high, an appropriate amount of acetone was added to the reaction system. During the reaction, the residual isocyanate content in the reaction system was monitored. When the isocyanate content in the reaction system no longer changed, the reaction was stopped, the temperature was lowered to 45°C, and the material was discharged. A neutralizing agent, triethylamine, was added to the reaction product, and deionized water was added while emulsifying the product using a high-speed shearing machine for 15 minutes. The acetone in the emulsion was removed by evaporation to obtain an emulsion with a solid content of 40%.

[0040] The emulsion is mixed with a cross-linking agent, a leveling agent and a wetting agent to obtain a polyurethane adhesive.

[0041] 2. Production process of floor glue

[0042] S1: a predetermined amount of TPU is cast-coated on one surface of the densely woven fabric layer, and the wear-resistant plastic layer is rolled with heat-insulating rollers. The wear-resistant plastic layer is then heated to an embossing temperature, and a wear-resistant pattern is formed on the surface of the wear-resistant plastic layer by an embossing roller. The wear-resistant surface layer of the TPU / densely woven fabric composite is then cooled.

[0043] S2: sequentially preparing a PVC pressure-resistant plastic layer (drying and plasticizing), a glass fiber mesh layer, and a coated PVC pressure-resistant plastic layer (drying and plasticizing) on ​​the surface of the release film, applying a foaming agent with PVC as a resin base material on the surface of the PVC pressure-resistant plastic layer, introducing it into a mold and heating and foaming it, and then heat-embossing the foamed layer to obtain a four-layer composite bottom layer of PVC pressure-resistant plastic layer / glass fiber mesh layer / PVC pressure-resistant plastic layer / PVC foam layer;

[0044] S3: Apply polyurethane adhesive to the other surface of the densely woven fabric layer in the wear-resistant surface layer, and heat the wear-resistant surface layer and the composite bottom layer separately until the two layers are bonded and composited to obtain a finished flooring product.

[0045] The thickness of the TPU cast layer of the finished floor glue product is 0.3mm, and the thickness of the polyurethane adhesive layer is 0.1mm.

[0046] 3. The influence of densely woven fabric on cast products

[0047] Process parameters of Example 1-2: TPU melt index is 45g / 10min, 200℃

[0048] / 2.16kg. The TPU casting temperature in S1 is 140°C; the continuous roller conveying uses a roller-pressing roller with a temperature of 140°C and a pressure of 20 kg; the embossing roller temperature is 135°C and the pressure is 25 kg.

[0049] Example 1: densely woven fabric: warp and weft density 46*50 (warp and weft roots / square inch), weight 250g / m 2 .

[0050] Example 2: densely woven fabric: warp and weft density 40*40 (number of warp and weft roots / square inch), weight 230g / m 2 .

[0051] Example 3 uses the densely woven fabric of Example 1, and differs from Example 1-2 in that the roller-to-roller pressure is 17 kg.

[0052] Visual inspection of the wear-resistant surface layers produced by the casting production line shows that the embossed patterns of Examples 1-3 are obvious, the non-casting surfaces of the wear-resistant surface layers of Examples 1 and 3 have no obvious TPU coverage, and the non-casting surface of the wear-resistant surface layer of Example 2 has a small amount of dot-shaped TPU coverage.

[0053] 4. The influence of polyurethane adhesive layer and process temperature on the peeling performance between finished floor glue layers

[0054] The crosslinking agent, leveling agent, wetting agent and water-based polyurethane emulsion in the polyurethane adhesive are configured according to the following groups:

[0055] A1: Based on the solid content of the waterborne polyurethane emulsion, add the following: 1.8% aminopropylamine crosslinker, 0.5% BYK-348 leveling agent, and 1.5% sodium stearate to the waterborne polyurethane emulsion;

[0056] A2: Based on the solid content of the waterborne polyurethane emulsion, add the following: 2.8% aminopropylamine crosslinker, 0.5% BYK-348 leveling agent, and 1.5% sodium stearate to the waterborne polyurethane emulsion;

[0057] A3: Based on the solid content in the water-based polyurethane emulsion, add the following to the water-based polyurethane emulsion: 2.8% aminopropylamine crosslinker, 0.5% BYK-348 leveling agent, and 1.5% alkylphenol polyoxyethylene ether.

[0058] A4: Based on the solid content in the water-based polyurethane emulsion, add the following: 2.6% aminopropylamine crosslinker, 0.2% decyldiethanolamine, 0.5% BYK-348 leveling agent, and 1.5% sodium stearate to the water-based polyurethane emulsion.

[0059] Examples 4-8 are based on the wear-resistant surface layer of Example 1. The process parameters of the production methods are shown in the following table:

[0060]

[0061]

[0062] Comparative Example

[0063] The TPU film is coated on the release paper; EPS hot melt adhesive film is used to bond the TPU film and the warp and weft density 46*50 (warp and weft roots / square inch) and gram weight 250g / m 2 The densely woven fabric, the composite temperature is 135 ° C, the composite pressure is kg, and the same embossing treatment as in Example 1 is performed to obtain the wear-resistant surface layer of the comparative sample;

[0064] The comparative example floor glue sample was prepared by using the wear-resistant surface layer of the comparative example sample as raw material and adopting the floor glue production process of Example 6.

[0065] The examples and comparative examples were tested as follows:

[0066] 1. Use tensile tester to test the peel strength PS1 between TPU layer and densely woven fabric;

[0067] 2. Use tensile tester to test the peel strength PS2 between densely woven fabric and composite bottom layer;

[0068] Test results:

[0069] PS1: The sample was taken from the middle of the roll, and the TPU layer / densely woven fabric was tightly attached at the side cut of the sample; in the floor glue test, the floor glue samples of Examples 4-8 and Example 2 could not be completely separated from the TPU and the densely woven fabric by means of a blade or the like for clamping by the tensile tester. The TPU layer and the densely woven fabric were tightly bonded, and the peel strength was empirically determined to be greater than 60N / m; the peel strength of the TPU layer and the densely woven fabric of Example 3 was 55N / m, and the peel strength of the TPU layer and the densely woven fabric of the comparative example was 47N / m.

[0070] Microscopic observation of the cross-section of the flooring showed that the penetration depth of TPU in Example 1 into the densely woven fabric was greater than that in Example 3.

[0071] The PS2 test results are shown in the table below:

[0072]

[0073]

[0074] Examples 4-7 form a control of the polyurethane adhesive components, and heating and compounding promote the volatilization of moisture in the adhesive; the addition of aminopropylamine crosslinking agent in the polyurethane adhesive helps the polyurethane chains form a three-dimensional network structure between the surface of the densely woven fabric, the surface of the PVC pressure-resistant layer, and the fibers of the densely woven fabric. Within a certain range of the amount of aminopropylamine crosslinking agent added, PS2 increases with the increase in the amount of aminopropylamine crosslinking agent added.

[0075] The difference between Examples 5 and 6 lies in the wetting agent. Under the high temperature conditions of adhesive compounding, the ester groups in the polyester fiber are hydrolyzed. The sodium stearate adsorbed on the surface of the polyester fiber helps promote the hydrolysis of the ester groups at high temperatures, thereby increasing the probability of cross-linking between the hydroxyl groups generated by the ester hydrolysis and the carboxyl groups of the polyurethane. This is manifested in the increased peel strength of Example 5 compared to Example 6.

[0076] The alkyl group in the decyldiethanolamine in Example 7 has a stronger lipophilicity and is more easily adsorbed on the surface of the polyester fiber, introducing more hydroxyl groups to the surface of the polyester fiber. The polyurethane chain segments introduce carboxyl groups via the polyol, resulting in an increase in the degree of cross-linking of the surface adsorbents between the polyurethane chains between the polyester fibers and between the polyurethane chains and the polyester fibers, and a denser network structure, which is manifested in an increase in the peel strength of Example 7 compared to Examples 4-6.

[0077] Examples 8 and 9 show that insufficient lamination temperature of the bottom layer will affect the cross-linking of polyurethane and polyester fiber, thereby causing PS2 to decrease compared with Example 7.

[0078] The non-cast surface of the polyester densely woven fabric in the wear-resistant surface layer of Example 2 has a dotted TPU coverage, and the polyurethane adhesive cannot fully penetrate under the covered area and adhere to the dotted TPU surface, which is manifested as a decrease in PS2 of Example 2 compared with Example 7; the PS2 of Example 3 is close to that of Example 7.

[0079] The polyurethane adhesive of the comparative example fully penetrated into the non-adhesive surface of the polyester densely woven fabric. Based on the same process parameters, its PS2 was close to that of Example 7.

[0080] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for producing dimensionally stable sports flooring, characterized in that: The dimensionally stable sports flooring comprises a wear-resistant surface layer, a pressure-resistant reinforcement layer, and an elastic foam layer stacked sequentially from the top to the bottom, wherein the wear-resistant surface layer comprises a densely woven fabric layer and a wear-resistant plastic layer located on one side of the densely woven fabric layer and composited with the densely woven fabric layer by its own melt. The production method comprises the following steps: S1: Casting a wear-resistant plastic layer melt on one surface of the densely woven fabric layer, heat-rolling, then heating and embossing the wear-resistant plastic layer, and cooling to obtain a wear-resistant surface layer; S2: A composite bottom layer with a pressure-resistant reinforcement layer and an elastic foam layer; S3: applying adhesive to the other surface of the densely woven fabric layer in the wear-resistant surface layer, and heating the wear-resistant surface layer and the composite bottom layer until they are bonded and composited; The densely woven fabric is a polyester fiber densely woven fabric, and the gram weight of the polyester fiber densely woven fabric is 220-270g / m 2 , The adhesive is a water-based polyurethane adhesive. The composition of the water-based polyurethane adhesive in S3 is: a water-based polyurethane emulsion with a solid content of 35% to 50%, a crosslinking agent, a leveling agent, a carboxylate anion wetting agent, and dodecyldiethanolamine and / or decyldiethanolamine accounting for 0.05% to 0.3% of the solid content of the water-based polyurethane emulsion.

2. The method for producing dimensionally stable sports flooring according to claim 1, characterized in that: The pressure-resistant reinforcement layer comprises a pressure-resistant plastic layer connected to the densely woven fabric layer, and the densely woven fabric layer and the pressure-resistant plastic layer are compositely connected via an adhesive layer.

3. The method for producing dimensionally stable sports flooring according to claim 2, characterized in that: The material of the wear-resistant plastic layer is TPU, and the base resin of the pressure-resistant plastic layer connected to the adhesive layer is PVC.

4. The method for producing dimensionally stable sports flooring according to claim 3, characterized in that: The TPU casting temperature in S1 is 133-143°C; the roller temperature for rolling and embossing is 133-143°C, and the roller pressure is 18-25 kg.

5. The method for producing dimensionally stable sports flooring according to claim 3 or 4, characterized in that: The number of warp and weft yarns per square inch of polyester fiber dense woven fabric is 43 to 52.

6. The method for producing dimensionally stable sports flooring according to claim 1, characterized in that: The mass of the crosslinking agent is 0.5% to 3.5% of the solid content in the waterborne polyurethane emulsion; the mass of the leveling agent is 0.1% to 2% of the solid content in the waterborne polyurethane emulsion; and the mass of the carboxylate anion wetting agent is 0.1% to 2% of the solid content in the waterborne polyurethane emulsion.

7. The method for producing dimensionally stable sports flooring according to claim 6, characterized in that: The cross-linking agent is aminopropylamine.

8. The method for producing dimensionally stable sports flooring according to claim 1, characterized in that: The composite temperature of the wear-resistant surface layer is 115-125°C, the composite temperature of the composite bottom layer is 135-147°C, and the composite pressure is 11-18 kg.

9. The method for producing dimensionally stable sports flooring according to claim 6, characterized in that: The preparation method of the water-based polyurethane in the water-based polyurethane emulsion is as follows: using isophorone diisocyanate as isocyanate, using diacid type polyester polyol as polyol, using organic tin as catalyst, using 1,4-butanediol as small molecule polyol, and using triethylamine as neutralizing agent to react to prepare the water-based polyurethane; The hydroxyl value of the diacid polyester polyol is 55-57 mgKOH / g, the R value of the isocyanate and the polyol is 1.3-1.4, the addition amount of the small molecule polyol is 3%-4% of the sum of the mass of the isocyanate and the polyol; and the reaction temperature is 65-85°C.

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