Non-slip mat with high static friction coefficient

Abstract

This invention relates to a high static friction coefficient anti-slip mat, comprising a surface layer and a foamed inner layer, the foamed inner layer being covered by the surface layer; the high static friction coefficient anti-slip mat, tested according to the ASTM D1894 standard method, has a static friction coefficient of 0.58 to 1.4; and the high static friction coefficient anti-slip mat is manufactured by injection molding a supercritical fluid mixture of a polymer material and a supercritical fluid; wherein the polymer material comprises a thermoplastic polyether ester elastomer, a thermoplastic polyurethane, or a combination thereof, and the elongation at break of the polymer material is 300% or more; the thermoplastic polyether ester elastomer has a melt index of less than 20 g / 10 min at 230°C and a Shore hardness D of 30D to 45D; the thermoplastic polyurethane has a melt index of less than 25 g / 10 min at 205°C and a Shore hardness A of 60A to 95A.

Description

Technical Field

[0001] This invention relates to a recyclable lightweight anti-slip mat with a high static friction coefficient, and more particularly to an anti-slip mat with a high static friction coefficient formed by supercritical fluid injection molding. Background Technology

[0002] Currently, the polymer materials used in anti-slip mats are mainly thermosetting rubbers. However, rubber is heavy, hard, requires additional processing, and cannot be recycled. Over time, discarded rubber has caused irreversible damage to the environment.

[0003] In response to the global trend of waste reduction and the environmentally friendly need for waste recycling, some researchers are now using recyclable thermoplastic elastomers with good mechanical properties, such as thermoplastic polyurethane (TPU), to replace non-recyclable thermosetting rubber in the manufacture of anti-slip mats. However, the anti-slip effect of anti-slip mats made of thermoplastic polyurethane is not ideal and there is still room for improvement.

[0004] Given the problems of existing rubber anti-slip mats being too heavy and difficult to recycle, and TPU anti-slip mats having poor anti-slip performance, it is necessary to find polymer materials that can be processed to have properties such as high static friction coefficient, lightweight, and recyclability. In addition, in order to make anti-slip mats using high-performance and recyclable materials, and at the same time improve the final performance of the anti-slip mats, it is still necessary to improve the relevant manufacturing processes. Summary of the Invention

[0005] In view of the aforementioned shortcomings of the prior art, one object of the present invention is to provide a recyclable lightweight anti-slip mat with a high static friction coefficient.

[0006] To achieve the above objectives, the present invention provides an anti-slip mat with a high static friction coefficient, comprising a surface layer and a foamed inner layer, the foamed inner layer being covered by the surface layer; the anti-slip mat with a high static friction coefficient conforms to ASTM standards. The static friction coefficient obtained by the D1894 standard method is 0.58 to 1.4; and the anti-slip mat with high static friction coefficient is made by a method comprising the following steps: (1) providing a polymer material comprising thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof, wherein the elongation at break of the polymer material is 300% or more; the thermoplastic polyether ester elastomer has a melt index of less than 20 g / 10 min at 230°C and a Shore hardness D of 30D to 45D; the thermoplastic polyurethane has a melt index of less than 25 g / 10 min at 205°C and a Shore hardness A of 60A to 95A; (2) melting the polymer material to obtain a molten polymer material; (3) adding a supercritical fluid to the molten polymer material and mixing to obtain a supercritical fluid mixture; and (4) injection molding the supercritical fluid mixture to obtain the anti-slip mat with high static friction coefficient.

[0007] This invention successfully obtains a structure comprising an unfoamed surface layer and a foamed inner layer with a specific ratio of open pores by selecting and recycling thermoplastic polyether elastomers and / or thermoplastic polyurethanes with melt flow index, Shore hardness, and elongation at break within a specific range, combined with supercritical fluid injection molding. This results in a recyclable, lightweight anti-slip mat with a high static friction coefficient. Thermoplastic polyether elastomers and thermoplastic polyurethanes are recyclable materials, and the unfoamed surface layer has high air permeability, acting as a breathable membrane. Therefore, air on the outside of the high static friction anti-slip mat can penetrate the unfoamed surface layer and enter the foamed inner layer, and air in the foamed inner layer can also penetrate the unfoamed surface layer and reach the outside of the high static friction anti-slip mat. Therefore, when the high static friction coefficient anti-slip pad is loaded with a load, the aforementioned open-cell micro-foamed structure is compressed, resulting in micro-distortion. At this time, the gas within the open pores of the foamed inner layer is forced out of the high static friction coefficient anti-slip pad through the breathable surface layer, creating an adsorption effect on the surface of the high static friction coefficient anti-slip pad. Both the aforementioned micro-distortion and adsorption effect contribute to increasing the high static friction coefficient of the anti-slip pad. The high static friction coefficient anti-slip pad of the present invention can also achieve a lightweight effect through the aforementioned foamed inner layer with a specific proportion of open pores. Furthermore, using supercritical fluid injection molding to achieve the foaming effect eliminates the need for highly volatile chemical foaming agents (such as pentane), avoids the production of toxic substances, and eliminates concerns about fire or pollution, thus broadening its application scope. It is understood that the present invention can also be completed by selecting or compounding the desired breathable polymer material according to the required melt index, Shore hardness, and elongation at break range at a specific temperature, thereby achieving the present invention.

[0008] In some embodiments, the surface layer does not have a porous structure. In some embodiments, the surface layer does not have a porous structure under a microscope.

[0009] In some embodiments, the surface layer is a breathable surface layer with a thickness of 50 μm to 600 μm. In some embodiments, the thickness of the surface layer is 60 μm to 550 μm, 70 μm to 500 μm, 80 μm to 450 μm, 90 μm to 400 μm, 100 μm to 350 μm, 150 μm to 300 μm, or 200 μm to 250 μm. In some embodiments, the thickness of the surface layer is 50 μm to 100 μm.

[0010] In some specific embodiments, when the breathable surface structure is worn away, the foamed inner layer is exposed, and when a load is applied, it will still produce microstructural deformation and adsorption effect, thereby maintaining the static friction coefficient of the anti-slip pad with a high static friction coefficient.

[0011] In some embodiments, the foamed inner layer includes multiple pores, comprising multiple closed pores and multiple open pores, with the proportion of open pores ranging from 10% to 75%. In some embodiments, the proportion of open pores is 15% to 65%, 20% to 60%, 25% to 55%, 30% to 50%, 35% to 45%, or 35% to 40%.

[0012] In some specific embodiments, the major axis of the plurality of pores (i.e., closed pores and open pores) in the foamed inner layer is 50 μm to 400 μm, or 100 μm to 350 μm, or 150 μm to 300 μm, or 200 μm to 250 μm. In this invention, the pores are irregularly shaped, and the major axis refers to the longest inner diameter of the pore. In this invention, the pores of the high static friction coefficient anti-slip pad foamed inner layer are filled with gas, wherein the term "closed pore" refers to a pore formed by a single nucleation point; and the term "open pore" refers to a pore formed by a through-hole between two or more closed pores.

[0013] In some specific embodiments, the thermoplastic polyether ester elastomer has monomers represented by formulas (I) and (II) as follows:

[0014]

[0015] The monomers represented by formula (I) account for 10% to 45% by weight; the monomers represented by formula (II) account for 55% to 90% by weight, and n is an integer from 3 to 35.

[0016] In some specific embodiments, n in equation (II) can be 4, 5, 6, 7, 8, 9, 10, 20, or 30.

[0017] In some embodiments, the polymeric material may be 100% by weight of the thermoplastic polyether ester elastomer. In some embodiments, the polymeric material may be 100% by weight of thermoplastic polyurethane.

[0018] In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyurethane can be used as a foaming performance enhancer.

[0019] In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is greater than or equal to 10% by weight and less than or equal to 90% by weight, and the content of the thermoplastic polyurethane is greater than or equal to 10% by weight and less than or equal to 90% by weight.

[0020] In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is greater than or equal to 20% by weight and less than or equal to 80% by weight, and the content of the thermoplastic polyurethane is greater than or equal to 20% by weight and less than or equal to 80% by weight. In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is greater than or equal to 30% by weight and less than or equal to 70% by weight, and the content of the thermoplastic polyurethane is greater than or equal to 30% by weight and less than or equal to 70% by weight. In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is greater than or equal to 40% by weight and less than or equal to 60% by weight, and the content of the thermoplastic polyurethane is greater than or equal to 40% by weight and less than or equal to 60% by weight. In some specific embodiments, the polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is 50% by weight, and the content of the thermoplastic polyurethane is 50% by weight.

[0021] In some specific embodiments, the polymer material further comprises one or more additives, which may be tackifiers, processing aids (such as silica and talc), antioxidants, ultraviolet absorbers, hindered amine compounds, lubricants, fillers, flame retardants, flame retardant additives, release agents, antistatic agents, peroxides and other molecular modifiers, metal inert agents, organic and inorganic nucleating agents, neutralizing agents, acid neutralizers, antibacterial agents, fluorescent whitening agents, organic and inorganic pigments, organic and inorganic compounds that impart flame retardancy or thermal stability, etc.

[0022] In some specific embodiments, the elongation at break of the polymer material is 300% to 600%, or 400% to 500%.

[0023] In some specific embodiments, the thermoplastic polyether ester elastomer has a melt index of 5 g / 10 min to 20 g / 10 min, or 5 g / 10 min to 18 g / 10 min, or 5 g / 10 min to 15.5 g / 10 min at 230°C.

[0024] In some specific embodiments, the Shore hardness D of the thermoplastic polyether ester elastomer is 30D to 40D.

[0025] In some specific embodiments, the melt index of the thermoplastic polyurethane at 205°C is 5 g / 10 min to 25 g / 10 min, or 10 g / 10 min to 25 g / 10 min, or 15 g / 10 min to 25 g / 10 min.

[0026] In some specific embodiments, the Shore A hardness of the thermoplastic polyurethane is 60A to 95A, or 70A to 90A, or 80A to 90A.

[0027] In some specific embodiments, the supercritical fluid added in step (3) is a supercritical nitrogen fluid. Under supercritical nitrogen conditions, nitrogen forms a supercritical fluid, meaning the temperature is higher than the critical temperature of nitrogen (-147°C, equivalent to 126.2K) and the pressure is higher than the critical pressure of nitrogen (3.4MPa, equivalent to 34 bar). In some specific embodiments, the supercritical fluid added in step (3) is a supercritical carbon dioxide fluid. Under supercritical carbon dioxide conditions, carbon dioxide forms a supercritical fluid, meaning the temperature is higher than the critical temperature of carbon dioxide (31°C, equivalent to 304.1K) and the pressure is higher than the critical pressure of carbon dioxide (7.38MPa, equivalent to 73.8 bar). In some specific embodiments, step (3) is performed at a temperature of 190°C to 230°C and a pressure of 127 bar.

[0028] In some specific embodiments, step (4) is performed in a mold, and the in-mold degassing delay time of the mold is 0.0 seconds to 0.8 seconds.

[0029] In some specific embodiments, the aforementioned manufacturing method further includes step (5): placing the anti-slip pad with a high static friction coefficient in a mold to allow it to cool. In some specific embodiments, the aforementioned manufacturing method further includes step (5): cooling the anti-slip pad with a high static friction coefficient.

[0030] In some specific embodiments, the high static friction coefficient anti-slip mat is prepared using a vertical injection molding machine or a horizontal injection molding machine. In some specific embodiments, the present invention is prepared using a vertical injection molding machine.

[0031] In some specific embodiments, the anti-slip mat with a high static friction coefficient is tested according to the ASTM D1894 standard method (with a standard slider weight of 200g during testing), and the resulting static friction index (i.e., the static friction coefficient at 200g) is 0.58 to 1.4, or 0.70 to 1.35. In some specific embodiments, the anti-slip mat with a high static friction coefficient is tested according to the ASTM D1894 standard method, but with the slider weight changed to 1000g, and the resulting static friction index (i.e., the static friction coefficient at 1000g, different from the test conditions of the ASTM D1894 standard method) is 0.62 to 2.3, or 0.70 to 2.27.

[0032] In some specific embodiments, the average density of the high static friction coefficient anti-slip pad is 0.35 g / cm³. 3 Up to 0.85 g / cm 3 Or 0.4 g / cm 3 Up to 0.8 g / cm 3 Or 0.45g / cm 3 Up to 0.7 g / cm 3 Or 0.5g / cm 3 Up to 0.6 g / cm 3 .

[0033] In some specific embodiments, the wear resistance of this high static friction coefficient anti-slip pad is 300 mm. 3 Below, or 250mm 3 Below, or 200mm 3 the following.

[0034] In some specific embodiments, the high static friction coefficient anti-slip pad, tested according to the ASTM D1894 standard method, has a static friction index of 0.58 to 1.4 and an average density of 0.35 g / cm³. 3 Up to 0.85 g / cm 3 . Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the straight injection molding machine used in this invention.

[0036] Figure 2A This is a schematic diagram of an anti-slip pad with a high static friction coefficient, as an example of the preparation of this invention.

[0037] Figure 2B This is a partially enlarged view of the anti-slip pad with a high static friction coefficient prepared according to an example of the present invention.

[0038] Figure 3 This is a schematic diagram of the anti-slip mat of a comparative example of the present invention.

[0039] Figure 4AThis is a 100x magnified scanned image of the foamed inner layer of the anti-slip pad with a high static friction coefficient prepared in Example 4 of the present invention.

[0040] Figure 4B This is a 100x magnified photograph of the outer surface of the anti-slip pad with a high static friction coefficient obtained in Example 4 of the present invention, taken with a scanning microscope. Detailed Implementation

[0041] The objectives, advantages, and technical features of the present invention will become apparent from the following detailed description of the embodiments and accompanying drawings.

[0042] Preparation of anti-slip mats with high static friction coefficient

[0043] The high static friction coefficient anti-slip pad of the present invention is used as follows: Figure 1 The product is manufactured using a vertical injection molding machine 10, but it can also be manufactured using a general horizontal injection molding machine. The injection molding machine 10 includes a first screw tube 11, a feeding device 12, a second screw tube 13, an injection gun 14, and a mold 15. The mold 15 has dimensions of 200mm x 200mm x 20mm.

[0044] Firstly, a polymer material is provided, comprising a thermoplastic polyether ester elastomer, a thermoplastic polyurethane, or a combination thereof, wherein the elongation at break of the polymer material is 300% or more; the thermoplastic polyether ester elastomer has a melt index of less than 20 g / 10 min and a Shore hardness D of 30 D to 45 D at 230 °C; the thermoplastic polyurethane has a melt index of less than 25 g / 10 min and a Shore hardness A of 60 A to 95 A at 205 °C.

[0045] As shown in Table 1, polymer materials 1 and 2 are thermoplastic polyether ester elastomers (TEEE), polymer materials 3 and 4 are thermoplastic polyurethanes (TPU), and polymer materials 5 and 6 are a combination of thermoplastic polyether ester elastomers and thermoplastic polyurethanes.

[0046] The following properties were tested for polymer materials 1 to 6, and the data obtained are shown in Table 1 below. A1. Melt flow index (MI) at 230℃: tested according to the ISO 1133 standard method.

[0047] A2. Melt flow index (MI) at 205°C: Tested according to the standard method of DIN-53735.

[0048] A3. Shore A Hardness: Tested according to ISO 868 standard method.

[0049] A4. Shore D: Tested according to ISO 868 standard method.

[0050] A5. Elongation at break of thermoplastic polyether ester elastomer: tested according to ISO 527 standard method.

[0051] A6. Elongation at break of thermoplastic polyurethane: Tested according to the standard method of DIN-53504.

[0052] Table 1

[0053]

[0054]

[0055] The preparation of anti-slip pads with high static friction coefficients as described in Examples 1 to 30 was carried out. First, as... Figure 1 As shown in Table 2, polymer materials 1 to 6 are fed into the first solenoid 11 through the feed hopper 110 at the amounts shown. The pressure inside the first solenoid 11 is set to 127 bar, and the temperature is set to 190°C to 230°C. The polymer material is melted in the first solenoid 11 to obtain a molten polymer material. The molten polymer material is then fed into the second solenoid 13, where the pressure is set to 145 bar to 165 bar, and the temperature is set to 190°C to 230°C. A feeding device 12 is located at the tip of the second solenoid 13, with an internal pressure set to 200 bar and a temperature set to 190°C to 230°C (above the critical temperature of nitrogen (-147°C)). Supercritical nitrogen fluid is added to the molten polymer material in the second solenoid 13 via the feeding device 12, and the mixture is kneaded under supercritical nitrogen conditions to obtain a supercritical fluid mixture.

[0056] The injection gun 14, located at the end of the second solenoid 13, is an injection cylinder-shaped device. The rear end of the injection cylinder is pressed down with a pressure of 35 to 40 bar (higher than the critical pressure of nitrogen (34 bar)). The supercritical fluid mixture is then drawn from the end of the second solenoid 13 into the front end of the injection gun 14 and injected into a mold 15 for injection molding, resulting in an anti-slip mat. The material quantity in Table 2 represents the weight of the supercritical fluid mixture entering the mold 15. The specific gravity of the anti-slip mat is the measured result obtained by controlling the material quantity. The mold pressure is the pressure inside the mold 15 before the supercritical fluid mixture is injected. The injection temperature and injection speed are the temperature and speed at which the supercritical fluid mixture enters the mold 15 from the injection gun 14. In Comparative Examples 1 to 6, the polymer materials 1 to 6 were directly injected into the mold 15 without pre-filling back pressure, and supercritical fluid without nitrogen was used for mixing and compounding. The resulting anti-slip mats do not have a foamed structure.

[0057] The supercritical fluid mixture is drawn into the injection gun 14 and injected into the mold 15. The pressure drops momentarily, and then depressurizes with the mold 15 to 1 atmosphere. Nitrogen gas rapidly precipitates from the supercritical fluid mixture, forming multiple nucleation sites. Subsequently, the nitrogen gas expands, generating fine bubbles. In Examples 1 to 30 and Comparative Examples 1 to 6, the upper and lower surfaces of the mold 15 each have vent holes (not shown in the figures). During injection molding in Examples 1 to 30 and Comparative Examples 1 to 6, the vent holes of the mold 15 open simultaneously with the injection of the supercritical fluid mixture into the mold 15, resulting in a venting delay time of 0.0 seconds. Finally, the anti-slip mat is left to cool in the mold 15 to obtain the anti-slip mat.

[0058] Table 2

[0059]

[0060]

[0061] Characteristics of anti-slip mats with high static friction coefficient

[0062] Figure 2A This is a schematic diagram of the anti-slip pad 20 with a high static friction coefficient prepared according to an example of the present invention. Figure 2B Then it is Figure 2A A magnified view of the area within the dashed box. Figure 3 This is a schematic diagram of the anti-slip mat 20' of the comparative example of the present invention. For example... Figure 2A , 2B As shown, the high static friction coefficient anti-slip pad 20 has a surface layer 21 and a foamed inner layer 22, which is covered by the surface layer 21. Both the surface layer 21 and the foamed inner layer 22 are made of thermoplastic polyether ester elastomer, thermoplastic polyurethane, or a combination thereof. Anti-slip pads 20 of Examples 1 to 30 were obtained according to the aforementioned manufacturing method, and their surfaces and cross-sections were observed using a scanning electron microscope. Figure 4A This is a 100x magnified scanned image of the foamed inner layer 22 of the high static friction coefficient anti-slip pad 20 prepared in Example 4 of the present invention. Figure 4B This is a 100x magnified photograph of the outer surface of the surface layer 21 of the high static friction coefficient anti-slip pad 20 prepared in Embodiment 4 of the present invention, taken with a scanning microscope. The surface layer 21 does not have a porous structure. The foamed inner layer 22 contains a plurality of pores 220 and 221, the major diameter of which is 50 μm to 400 μm. It includes a plurality of closed pores 220 and a plurality of open pores 221, wherein each open pore 221 has at least one through hole 222, connecting it to another open pore 221. The proportion of open pores 221 is 10% to 75%, and the type of polymer material used and the pressure difference between the injection gun 14 and the mold 15 both affect the shape of the pores. Figure 2B The arrows indicate that air can penetrate the surface layer 21 of the high static friction coefficient anti-slip pad 20 and enter the foamed inner layer 22 from the outside of the high static friction coefficient anti-slip pad 20, or enter the outside of the high static friction coefficient anti-slip pad 20 from the foamed inner layer 22. In static friction coefficient tests, the breathable surface layer 21 may cause air to enter and exit the surface, creating a similar adsorption effect. Therefore, the static friction coefficients of the high static friction coefficient anti-slip pads 20 (having a surface layer 21 and a foamed inner layer 22) of Examples 1 to 30 are respectively higher than those of their corresponding Comparative Examples 1 to 6 anti-slip pads 20' (without a surface layer 21 and a foamed inner layer 22). Furthermore... Figure 3 As shown, in Comparative Examples 1 to 6, since supercritical fluid without nitrogen was used for mixing, the resulting anti-slip mat 20' does not have the structure of surface layer 21 and foamed inner layer 22, but is a solid structure.

[0063] The thickness of the surface layer 21 of the anti-slip mats 20 with high static friction coefficients of Examples 1 to 30 was calculated. Related tests were also conducted on the properties of the anti-slip mats 20 with high static friction coefficients of Examples 1 to 30 and the anti-slip mats 20' of Comparative Examples 1 to 6. The obtained data are shown in Table 3 below. Furthermore, the surface layer 21 of the anti-slip mats 20 of Examples 1, 5, 11, 15, 26, and 30 was cut off, and their air permeability was tested. The obtained data are also shown in Table 3 below.

[0064] B1. Average density: Tested according to ISO 1183 standard method, the unit is grams per cubic centimeter (g / cm³). 3 ).

[0065] B2. Percentage of open openings: Tested according to ASTM D6226 standard method.

[0066] The static friction coefficient of B3.200g is tested according to the ASTM D1894 standard method, with a standard slider weight of 200g during the test.

[0067] B4.1000g static friction coefficient: tested according to ASTM D1894 standard method, but the slider weight during the test was changed to 1000g.

[0068] B5. Air permeability: Tested according to JIS L1099A1 standard method, with units of grams per square meter per 24 hours (g / m²). 2 / 24h).

[0069] The data series obtained from the aforementioned observations and tests are shown in Table 3.

[0070] Table 3

[0071]

[0072]

[0073]

[0074] As shown in Table 3, in the standard test method for static friction coefficient (using a 200g slider to test the static friction coefficient), the anti-slip mats of Examples 1 to 30 of the present invention have good static friction coefficients, all of which are higher than those of the comparative examples of the same material. This shows that the structure of the high static friction coefficient anti-slip mat of the present invention can increase the static friction coefficient by about 1.2 times or more; moreover, the lower the average density, the better the anti-slip effect, and the lightweight and anti-slip effects can be achieved at the same time.

[0075] Furthermore, when the weight of the slider used in the standard test method for static friction coefficient is increased by 5 times (1000g), the anti-slip pads with high static friction coefficients of Examples 1 to 30 of the present invention exhibit a better static friction coefficient (above 0.62), demonstrating that the structure of the anti-slip pads with high static friction coefficients of the present invention can provide a greater static friction coefficient when subjected to higher loads.

[0076] As can be seen from the air permeability data, the polymer materials used in this invention, whether thermoplastic polyether ester elastomer (Examples 1 and 5, which use polymer material 1), thermoplastic polyurethane (Examples 11 and 15, which use polymer material 3), or a composition of thermoplastic polyether ester elastomer and thermoplastic polyurethane (Examples 26 and 30, which use polymer material 6), do have air permeability on their surface. This shows that air can indeed penetrate the surface of the anti-slip pad of this invention, thereby producing an adsorption effect on the surface of the anti-slip pad with a high static friction coefficient, and improving the high static friction coefficient of the anti-slip pad.

[0077] As can be seen from the above, in the high static friction coefficient anti-slip pad of the present invention, the thickness of the surface layer is 50 μm to 600 μm, and the proportion of the plurality of open pores in the foamed inner layer is 10% to 75%; and the static friction coefficient of the high static friction coefficient anti-slip pad is 0.58 to 1.4. Therefore, the high static friction coefficient anti-slip pad of the present invention has a high static friction coefficient and excellent anti-slip effect.

[0078] The high static friction coefficient anti-slip mat of this invention is produced using supercritical fluid injection molding technology without the use of chemical foaming agents. This process does not produce toxic substances, and there are no concerns about fire or pollution during production. Even when the weight of the test slider is increased by five times, the finished product still maintains a high static friction coefficient (greater than 0.58), exhibiting excellent anti-slip performance. Furthermore, the high static friction coefficient anti-slip mat of this invention can reduce the average density to 0.35 g / cm³. 3 This is highly beneficial for lightweighting. Using recyclable thermoplastic polyether ester elastomers and / or thermoplastic polyurethanes as raw materials is more in line with the environmental protection requirements of waste reduction and recycling.

Claims

1. A high static friction coefficient anti-slip mat, characterized in that, It has a surface layer and a foamed inner layer, the foamed inner layer being covered by the surface layer; The surface layer is a breathable layer with a thickness of 50 μm to 600 μm; wherein the foamed inner layer comprises a plurality of cells, the plurality of cells comprising a plurality of closed cells and a plurality of open cells, and the high static coefficient of friction slip resistant pad has an open cell content of 45% to 75% as determined by testing according to ASTM D6226 standard method; an average density of 0.35 g / cm 3 to 0.7 g / cm 3 ; a static coefficient of friction of 0.58 to 1.4 as determined by testing according to ASTM D1894 standard method using a standard slider weight of 200 g; and the high static coefficient of friction slip resistant pad is made by a method comprising the following steps: (1) A polymer material is provided, the polymer material comprising a thermoplastic polyether ester elastomer, a thermoplastic polyurethane, or a combination thereof, wherein the elongation at break of the polymer material is 300% or more; the thermoplastic polyether ester elastomer has a melt index of less than 20 g / 10 min and a Shore hardness D of 30D to 45D at 230°C; the thermoplastic polyurethane has a melt index of less than 25 g / 10 min and a Shore hardness A of 60A to 95A at 205°C; (2) The polymer material is melted to obtain a molten polymer material; (3) A supercritical fluid is added to the molten polymer material and mixed to obtain a supercritical fluid mixture. and (4) The supercritical fluid mixture is injection molded to obtain the anti-slip mat with high static friction coefficient.

2. The anti-slip mat with a high static friction coefficient as described in claim 1, characterized in that, The polymer material comprises a combination of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane, wherein, based on the total weight of the polymer material, the content of the thermoplastic polyether ester elastomer is greater than or equal to 10% by weight and less than or equal to 90% by weight, and the content of the thermoplastic polyurethane is greater than or equal to 10% by weight and less than or equal to 90% by weight.

3. The anti-slip mat with a high static friction coefficient as described in claim 1, characterized in that, The supercritical fluid is either nitrogen or carbon dioxide.

4. The anti-slip mat with a high static friction coefficient as described in claim 1, characterized in that, The anti-slip pad with a high static friction coefficient was tested according to the ASTM D1894 standard method, but with the slider weight set at 1000 g, and the static friction coefficient was obtained from 0.62 to 2.3.

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