CN117841470A - High static friction coefficient anti-slip pad - Google Patents
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Abstract
The invention relates to a high static friction coefficient anti-slip pad, which is provided with a surface layer and a foaming inner layer, wherein the foaming inner layer is covered by the surface layer; the high static friction coefficient anti-slip pad has a static friction coefficient of 0.58 to 1.4 when tested according to the ASTM D1894 standard method; the anti-slip pad with high static friction coefficient is prepared by injection molding of a high polymer material and a supercritical fluid mixture of a supercritical fluid; wherein the polymer material comprises a thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof, and the breaking elongation of the polymer material is more than 300%; the thermoplastic polyether ester elastomer has a melt index of 20g/10min or less and a Shore D hardness of 30D to 45D at 230 ℃; the thermoplastic polyurethane has a melt index of 25g/10min or less at 205 ℃ and a Shore A hardness of 60A to 95A.
Description
Technical Field
The present invention relates to a recoverable light-weight anti-slip pad with high static friction coefficient, and more particularly to an anti-slip pad with high static friction coefficient formed by supercritical fluid injection molding.
Background
The existing polymer materials applied to the anti-slip pad are mainly thermosetting rubber, but the rubber is heavy in weight, hard in material, required to be additionally processed and cannot be recycled. Waste rubber has long caused irrecoverable damage to the environment.
In response to the trend of global waste reduction and environmental protection requirements for waste recovery, thermoplastic elastomers such as thermoplastic polyurethane (thermoplastic polyurethane, TPU) which are recyclable and have good mechanical properties have been used to replace non-recyclable thermosetting rubber for manufacturing non-slip mats. However, the anti-slip effect of the anti-slip pad prepared from the thermoplastic polyurethane is not ideal, and there is still room for further improvement.
In view of the problems that the weight of the conventional rubber anti-slip pad is too heavy and is not easy to recycle, and the anti-slip effect of the TPU anti-slip pad is poor, a polymer material which can be processed and manufactured and has the characteristics of high static friction coefficient, light weight, recycling and the like is required to be found. In addition, in order to make the anti-slip pad using a material which is excellent in performance and can be recycled, and to improve the final performance of the anti-slip pad, there is still a need for improving the related processes.
Disclosure of Invention
In view of the foregoing shortcomings of the prior art, it is an object of the present invention to provide a recyclable light weight non-slip mat with a high coefficient of static friction.
In order to achieve the above-mentioned object, the present invention provides a high static friction coefficient anti-slip pad, which has a surface layer and a foaming inner layer, wherein the foaming inner layer is covered by the surface layer; the high static friction coefficient anti-slip pad has a static friction coefficient of 0.58 to 1.4 when tested according to the ASTM D1894 standard method; the anti-slip pad with high static friction coefficient is prepared by a method comprising the following steps: (1) Providing a high polymer material, wherein the high polymer material comprises a thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof, and the breaking elongation of the high polymer material is more than 300%; the thermoplastic polyetherester elastomer has a melt index of 20g/10min (g/10 min) or less at 230 ℃ and a Shore D hardness of 30D to 45D; the thermoplastic polyurethane has a melt index of 25g/10min or less at 205 ℃ and a Shore A hardness of 60A to 95A; (2) Melting the polymer material to obtain a melted polymer material; (3) Adding a supercritical fluid into the melted polymer material for mixing to obtain a supercritical fluid mixture; and (4) injection molding the supercritical fluid mixture to obtain the anti-slip pad with high static friction coefficient.
The invention selects, recycles and recycles the thermoplastic polyether ester elastomer and/or thermoplastic polyurethane with the melt index, the Shore hardness and the fracture elongation in a specific range, and combines the supercritical fluid to carry out injection molding, thereby successfully obtaining the structure comprising an unfoamed surface layer and a foamed inner layer with open holes in a specific proportion, and obtaining the recyclable light-weight anti-slip pad with high static friction coefficient. The thermoplastic polyether ester elastomer and the thermoplastic polyurethane belong to recyclable materials, and the unfoamed surface layer has high air permeability and is equivalent to an air permeable film, so that air outside the high-static-friction-coefficient anti-slip pad can penetrate through the unfoamed surface layer and enter the foamed inner layer, and air in the foamed inner layer can also penetrate through the unfoamed surface layer to reach the outer side of the high-static-friction-coefficient anti-slip pad. Therefore, when the anti-slip pad with high static friction coefficient is loaded with a load, the open-cell micro-foam structure is compressed to generate micro-structural deformation (micro-dispersion), and at the moment, the gas in the open holes of the foam inner layer is extruded out of the anti-slip pad with high static friction coefficient through the ventilation surface layer, so that an adsorption effect is generated on the surface of the anti-slip pad with high static friction coefficient, and the micro-structural deformation and the adsorption effect are both helpful for improving the anti-slip pad with high static friction coefficient. The anti-slip pad with high static friction coefficient can achieve the effect of light weight by the foaming inner layer with the open holes with specific proportion. In addition, the foaming effect is achieved by using supercritical fluid injection molding, a high-volatility chemical foaming agent (such as pentane) is not needed, toxic substances are not generated, fire or pollution is not caused, and the application range is wider. It will be appreciated that the present invention can also be accomplished by selecting, or modifying (compounding) the desired breathable polymeric material according to the desired melt index, shore hardness and elongation at break range at a particular temperature.
In some embodiments, the skin layer does not have a hole structure. In some embodiments, the surface layer does not have a hole structure under a microscope.
In some embodiments, the skin layer is a breathable skin layer having a thickness of 50 μm to 600 μm. In some embodiments, the thickness of the skin 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 skin layer has a thickness of 50 μm to 100 μm.
In some embodiments, when the breathable skin structure wears away, the foamed inner layer is exposed and yet generates a microstructure deformation and adsorption effect when loaded with a load, thereby maintaining the static coefficient of friction of the high coefficient of static friction non-slip mat.
In some embodiments, the foamed inner layer comprises a plurality of pores comprising closed pores (closed pores) and open pores (open pores), and the ratio of the open pores is 10% to 75%. In some embodiments, the plurality of open pores comprises 15% to 65%, 20% to 60%, 25% to 55%, 30% to 50%, 35% to 45%, or 35% to 40%.
In some embodiments, the plurality of pores (i.e., closed pores and open pores) in the foamed inner layer have a major diameter of 50 μm to 400 μm, or 100 μm to 350 μm, or 150 μm to 300 μm, or 200 μm to 250 μm. In the present invention, the hole is irregularly shaped, and its long diameter means the longest inner diameter of the hole. In the present invention, the pores of the foaming inner layer of the high static friction coefficient anti-slip pad are wrapped with gas, wherein the term "closed pores" refers to pores formed by a single nucleation point; the term "open hole" refers to a hole formed by creating a through hole between two or more closed holes.
In some embodiments, the thermoplastic polyetherester elastomer has monomers of the following formula (I) and formula (II):
wherein the monomer of formula (I) comprises 10 to 45% by weight; the monomer represented by formula (II) accounts for 55 to 90 wt%, and n is an integer of 3 to 35.
In some embodiments, n in formula (II) may be 4, 5, 6, 7, 8, 9, 10, 20, 30.
In some embodiments, the polymeric material can be 100% by weight of the thermoplastic polyetherester elastomer. In some embodiments, the polymeric material may be 100% by weight thermoplastic polyurethane.
In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, where the thermoplastic polyurethane can act as a foaming property enhancer.
In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyetherester elastomer is present in an amount of greater than or equal to 10 wt.% to less than or equal to 90 wt.% and the thermoplastic polyurethane is present in an amount of greater than or equal to 10 wt.% to less than or equal to 90 wt.%, based on the total weight of the polymeric material.
In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyetherester elastomer is present in an amount of from greater than or equal to 20 wt% to less than or equal to 80 wt% and the thermoplastic polyurethane is present in an amount of from greater than or equal to 20 wt% to less than or equal to 80 wt%, based on the total weight of the polymeric material. In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyetherester elastomer is present in an amount of greater than or equal to 30 wt.% to less than or equal to 70 wt.% and the thermoplastic polyurethane is present in an amount of greater than or equal to 30 wt.% to less than or equal to 70 wt.%, based on the total weight of the polymeric material. In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyetherester elastomer is present in an amount of from greater than or equal to 40 wt% to less than or equal to 60 wt% and the thermoplastic polyurethane is present in an amount of from greater than or equal to 40 wt% to less than or equal to 60 wt%, based on the total weight of the polymeric material. In some embodiments, the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, wherein the thermoplastic polyetherester elastomer is present in an amount of 50 wt% and the thermoplastic polyurethane is present in an amount of 50 wt% based on the total weight of the polymeric material.
In some embodiments, the polymeric material further comprises one or more additives, which may be tackifiers, processing aids (e.g., silica, talc), antioxidants, ultraviolet absorbers, hindered amine-based compounds, lubricants, fillers, flame retardants, flame retardant aids, mold release agents, antistatic agents, molecular regulators such as peroxides, metal inert agents, organic and inorganic nucleating agents, neutralizing agents, acid generators, antimicrobial agents, fluorescent whitening agents, organic and inorganic pigments, organic and inorganic compounds imparting flame retardancy or thermal stability, and the like.
In some embodiments, the polymeric material has an elongation at break of 300% to 600%, or 400% to 500%.
In some embodiments, the thermoplastic polyetherester elastomer has a melt index of 5g/10min to 20g/10min, or 5g/10min to 18g/10min, or 5g/10min to 15.5g/10min at 230 ℃.
In some embodiments, the thermoplastic polyetherester elastomer has a shore D hardness of 30D to 40D.
In some embodiments, the thermoplastic polyurethane has a melt index of 5g/10min to 25g/10min, or 10g/10min to 25g/10min, or 15g/10min to 25g/10min at 205 ℃.
In some embodiments, the thermoplastic polyurethane has a shore a hardness of 60A to 95A, or 70A to 90A, or 80A to 90A.
In some embodiments, the supercritical fluid added in step (3) is a supercritical fluid of nitrogen, which forms a supercritical fluid under supercritical conditions of nitrogen, i.e., at a temperature above the critical temperature of nitrogen of-147 ℃ (corresponding to 126.2K) and at a pressure 3.4MPa (corresponding to 34 bar) above the critical pressure of nitrogen. In some embodiments, the supercritical fluid added in step (3) is a supercritical fluid of carbon dioxide, which forms a supercritical fluid under supercritical conditions of carbon dioxide, i.e., the temperature is 31 ℃ above the critical temperature of carbon dioxide (corresponding to 304.1K), and the pressure is 7.38MPa above the critical pressure of carbon dioxide (corresponding to 73.8 bar). In some embodiments, step (3) is performed at a temperature of 190 ℃ to 230 ℃ and a pressure of 127 bar.
In some embodiments, the step (4) is performed in a mold, and the mold has an in-mold venting delay time of 0.0 seconds to 0.8 seconds.
In some embodiments, the aforementioned method further comprises step (5): the high static friction coefficient anti-slip pad is placed in a mould for cooling. In some embodiments, the aforementioned method further comprises step (5): the high coefficient of static friction non-slip mat is cooled.
In some embodiments, the high coefficient of static friction non-slip mat is prepared using a straight injection molding machine or a horizontal injection molding machine. In some embodiments, the methods of the present invention are performed using a straight injection molding machine.
In some embodiments, the high static coefficient of friction non-slip mat has a static friction index (i.e., a static coefficient of friction of 200 g) of 0.58 to 1.4, or 0.70 to 1.35, as measured according to ASTM D1894 standard method (standard slider weight of 200g when tested). In some embodiments, the high static coefficient of friction non-slip mat has a static friction index (i.e., a static coefficient of friction of 1000g, test conditions different from the ASTM D1894 standard method) of 0.62 to 2.3, or 0.70 to 2.27, according to the ASTM D1894 standard method, but changing the weight of the slider at the time of testing to 1000g.
In some embodiments, the high coefficient of static friction slip resistant pad has an average density of 0.35g/cm 3 To 0.85g/cm 3 Or 0.4g/cm 3 To 0.8g/cm 3 Or 0.45g/cm 3 To 0.7g/cm 3 Or 0.5g/cm 3 To 0.6g/cm 3 。
In some embodiments, the high coefficient of static friction anti-skid pad has a wear resistance of 300mm 3 Below, or 250mm 3 Below, or 200mm 3 The following is given.
In some embodiments, the high coefficient of static friction non-slip mat has a static friction index of 0.58 to 1.4 and an average density of 0.35g/cm, as measured according to ASTM D1894 standard method 3 To 0.85g/cm 3 。
Drawings
FIG. 1 is a schematic view of a straight injection molding machine used in the present invention.
FIG. 2A is a schematic illustration of a high static coefficient of friction non-slip mat according to a preparation example of the present invention.
FIG. 2B is an enlarged view of a portion of a high static coefficient of friction non-slip mat according to a preparation example of the present invention.
FIG. 3 is a schematic view of a non-slip mat according to a comparative example of the present invention.
FIG. 4A is a photograph of a 100 times magnification of a scanning microscope of a section of a foamed inner layer of a high static friction coefficient anti-slip pad prepared in example 4 of the present invention.
FIG. 4B is a photograph of the outer surface of the surface layer of the high static friction coefficient anti-slip pad prepared in example 4 of the present invention magnified 100 times by a scanning microscope.
Detailed Description
The objects, advantages and technical features of the present invention will become apparent from the following detailed description of the embodiments and the accompanying drawings.
Preparation of anti-slip pad with high static friction coefficient
The high static coefficient of friction slip pad of the present invention is prepared using a straight injection molding machine 10 as shown in fig. 1, but may also be prepared using a conventional horizontal injection molding machine. The injection molding machine 10 includes a first coil 11, a feeder 12, a second coil 13, a gun 14, and a die 15. The size of the die 15 is 200mm x200mm x 20mm.
Firstly, providing a high polymer material, wherein the high polymer material comprises a thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof, and the breaking elongation of the high polymer material is more than 300 percent; the thermoplastic polyether ester elastomer has a melt index of 20g/10min or less and a Shore D hardness of 30D to 45D at 230 ℃; the thermoplastic polyurethane has a melt index of 25g/10min or less at 205 ℃ and a Shore A hardness of 60A to 95A.
As shown in table 1, the polymer materials 1 and 2 are thermoplastic polyether ester elastomers (TEEEs), the polymer materials 3 and 4 are Thermoplastic Polyurethanes (TPU), and the polymer materials 5 and 6 are compositions of thermoplastic polyether ester elastomers and thermoplastic polyurethanes.
The following properties were tested for the polymer materials 1 to 6, and the data obtained are shown in table 1 below. A1. Melt Index (MI) at 230 ℃: the test was performed according to the ISO 1133 standard method.
A2. Melt Index (MI) at 205 ℃): the test was carried out according to DIN-53735 standard method.
A3. Shore a hardness (Shore a): the test was performed according to the ISO 868 standard method.
A4. Shore D (Shore D): the test was performed according to the ISO 868 standard method.
A5. Elongation at break of thermoplastic polyetherester elastomer: the test was performed according to the ISO 527 standard method.
A6. Elongation at break of thermoplastic polyurethane: the test was carried out according to DIN-53504 standard method.
TABLE 1
The preparation of the high static coefficient of friction non-slip mat of examples 1 to 30 was performed. First, as shown in fig. 1, the polymer materials 1 to 6 were fed into the first coil 11 from the feeding hopper 110 in the amounts shown in table 2, respectively, and the pressure inside the first coil 11 was set to 127 bar and the temperature was set to 190 ℃ to 230 ℃. Melting the polymer material in the first screw 11 to obtain a melted polymer material; the molten polymeric material is then fed into a second coil 13, the pressure in the second coil 13 being set at 145 bar to 165 bar and the temperature being set at 190 ℃ to 230 ℃. The feeding device 12 is arranged at the front end of the second screw tube 13, the internal pressure is set to be 200 bar, the temperature is set to be 190 ℃ to 230 ℃ (the temperature is higher than the critical temperature (-147 ℃) of nitrogen), the supercritical fluid of nitrogen is added into the melted polymer material in the second screw tube 13 through the feeding device 12, and the mixture is kneaded under the supercritical condition of nitrogen, so as to obtain a supercritical fluid kneaded product.
The gun 14 at the end of the second screw tube 13 is a syringe-shaped device, the rear end of the syringe is pressed at a pressure of 35 bar to 40 bar (the pressure is higher than the critical pressure of nitrogen (34 bar)), then the supercritical fluid mixture is sucked into the front end of the gun 14 from the end of the second screw tube 13, and the supercritical fluid mixture is injected into a mold 15 for injection molding, thereby obtaining a slip-resistant pad. The amount of the supercritical fluid kneaded matter entering the die 15 is shown in table 2, the slip pad specific gravity is a measured result obtained by controlling the amount of the supercritical fluid kneaded matter, the in-die pressure is the pressure inside the die 15 before the supercritical fluid kneaded matter is ejected, and the ejection temperature and the ejection speed are the temperature and the velocity at which the supercritical fluid kneaded matter enters the die 15 from the gun 14. The polymer materials 1 to 6 of comparative examples 1 to 6 were directly injected into the mold 15 without pre-filling back pressure, and the supercritical fluid without adding nitrogen was mixed and kneaded, so that the obtained non-slip mat had no foaming structure.
At the moment when the supercritical fluid mixture is sucked into the gun 14 and injected into the die 15, the pressure is reduced, the pressure is relieved along with the die 15, the pressure is reduced to 1 atmosphere, nitrogen gas can be rapidly separated out from the supercritical fluid mixture to form a plurality of nucleation points, and then the nitrogen gas expands to generate fine bubbles. In examples 1 to 30 and comparative examples 1 to 6, the upper and lower surfaces of the mold 15 were each provided with a vent hole (not shown), and when the injection molding was performed in examples 1 to 30 and comparative examples 1 to 6, the vent holes of the mold 15 were opened as soon as the supercritical fluid kneaded matter was injected into the mold 15, so that the in-mold venting delay time was 0.0 seconds. Finally, the non-slip mat is placed in the mold 15 for cooling, and the non-slip mat is obtained.
TABLE 2
Characteristics of high coefficient of static friction anti-skid pad
Fig. 2A is a schematic diagram of a high static friction coefficient anti-slip pad 20 according to a preparation example of the present invention, fig. 2B is a partially enlarged view of the anti-slip pad 20 'according to a comparative example of the present invention, and fig. 3 is a partially enlarged view of the anti-slip pad 20' according to a dashed line frame of fig. 2A. As shown in fig. 2A and 2B, the high static friction coefficient anti-slip pad 20 has a surface layer 21 and a foam inner layer 22, wherein the foam inner layer 22 is covered by the surface layer 21, and the surface layer 21 and the foam inner layer 22 are made of thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof. The anti-slip pads 20 of examples 1 to 30 were obtained according to the above-mentioned method, and the surface and the cross section thereof were observed by a scanning electron microscope, wherein fig. 4A is a photograph of the cross section of the foamed inner layer 22 of the anti-slip pad 20 with high static friction coefficient obtained in example 4 of the present invention magnified 100 times by a scanning microscope, and fig. 4B is a photograph of the outer side surface of the surface layer 21 of the anti-slip pad 20 with high static friction coefficient obtained in example 4 of the present invention magnified 100 times by a scanning microscope. The surface layer 21 has no hole structure. The foamed inner layer 22 comprises a plurality of holes 220, 221, wherein the holes 220, 221 have a long diameter of 50 μm to 400 μm, and comprise a plurality of closed holes 220 and a plurality of open holes 221, wherein any one of the open holes 221 has at least one through hole 222, so that the open hole 221 is connected with another open hole 221. The open cavity 221 has a ratio of 10% to 75%, wherein the type of polymer material used, and the pressure difference between the gun 14 and the die 15 have an effect on the cavity shape. The arrows in fig. 2B indicate that air can penetrate through the surface layer 21 of the high-coefficient-of-static-friction non-slip pad 20, from the outside of the high-coefficient-of-static-friction non-slip pad 20 into the foamed inner layer 22, or from the foamed inner layer 22 into the outside of the high-coefficient-of-static-friction non-slip pad 20. In the test of the static friction coefficient, the breathable skin layer 21 may cause air to enter and exit the skin layer, resulting in a similar adsorption effect, and therefore, the static friction coefficients of the high static friction coefficient non-slip mat 20 (having the skin layer 21 and the foamed inner layer 22) of examples 1 to 30 are higher than those of the corresponding non-slip mat 20' of comparative examples 1 to 6 (without the construction of the skin layer 21 and the foamed inner layer 22), respectively. As shown in fig. 3, in comparative examples 1 to 6, the slip mat 20' formed by kneading the supercritical fluid without adding nitrogen had a solid structure without having the structures of the surface layer 21 and the foamed inner layer 22.
The thicknesses of the surface layers 21 of the high-static-friction-coefficient anti-slip pads 20 of examples 1 to 30 were calculated, and also the properties of the high-static-friction-coefficient anti-slip pads 20 of examples 1 to 30 and the anti-slip pads 20' of comparative examples 1 to 6 were subjected to the relevant tests, and the obtained data are shown in table 3 below. The air permeability of the surface layer 21 of the non-slip mat 20 of examples 1, 5, 11, 15, 26, and 30 was measured by cutting, and the obtained data are shown in table 3 below.
B1. Average density: the test was carried out according to the ISO 1183 standard method in grams per cubic centimeter (g/cm) 3 )。
B2. Open pore ratio: the test was performed according to ASTM D6226 standard method.
Static coefficient of friction of b3.200 g: the standard slider weight at the time of testing was 200g according to ASTM D1894 standard method.
Static coefficient of friction of b4.1000 g: the test was performed according to ASTM D1894 standard method, but the slider weight at the time of the test was changed to 1000g.
B5. Air permeability: the test was carried out according to JIS L1099A1 standard method in units of g/square meter/24 hours (g/m 2 /24h)。
The data obtained from the foregoing observations and tests are presented in Table 3.
TABLE 3 Table 3
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As can be seen from table 3, in the standard test method of static friction coefficient (using 200g of slider to test static friction coefficient), the static friction coefficients of the anti-slip pads of examples 1 to 30 of the present invention are all better than those of the comparative examples of the same material, and the structure of the anti-slip pad with high static friction coefficient of the present invention can increase the static friction coefficient by more than about 1.2 times; the lower the average density is, the better the anti-slip effect is, and the light weight and the anti-slip effect can be achieved at the same time.
In addition, the high static coefficient of friction non-slip pads of examples 1 to 30 of the present invention exhibited a better static coefficient of friction (higher than 0.62) with a 5-fold increase in the weight of the slider (1000 g) used in the standard test method for static coefficient of friction, and the structure of the high static coefficient of friction non-slip pad of the present invention provided a greater static coefficient of friction when loaded with a higher load.
As is clear from the air permeability data, the polymer material used in the present invention is either a thermoplastic polyether ester elastomer (examples 1 and 5, which use polymer material 1), a thermoplastic polyurethane (examples 11 and 15, which use polymer material 3), or a composition of a thermoplastic polyether ester elastomer and a thermoplastic polyurethane (examples 26 and 30, which use polymer material 6), and the surface layer thereof has air permeability, and it is revealed that air can surely penetrate the surface layer of the anti-slip mat of the present invention, and further an adsorption effect is generated on the surface of the anti-slip mat having a high static friction coefficient, thereby improving the static friction coefficient of the anti-slip mat.
As can be seen from the above, in the high static friction coefficient anti-slip pad of the present invention, the thickness of the skin layer is 50 μm to 600 μm, and the ratio of the open cells in the foamed inner layer is 10% to 75%; and the static friction coefficient of the anti-slip pad with high static friction coefficient is 0.58 to 1.4. Therefore, the anti-slip pad with high static friction coefficient has high static friction coefficient and excellent anti-slip effect.
The anti-slip pad with high static friction coefficient is obtained by a supercritical fluid injection molding technology without using a chemical foaming agent, does not generate toxic substances, does not cause fire or pollution in the production process, and has high static friction coefficient (higher than 0.58) even if the weight of a sliding block for testing is increased by 5 times, and has excellent anti-slip effect. In addition, the anti-slip pad with high static friction coefficient can reduce the average density to 0.35g/cm 3 Is very beneficial to light weight. The recyclable thermoplastic polyether ester elastomer and/or thermoplastic polyurethane are used as raw materials, so that the environment-friendly requirement of waste reduction and recycling is met.
Claims (6)
1. The anti-slip pad with high static friction coefficient is characterized by comprising a surface layer and a foaming inner layer, wherein the foaming inner layer is covered by the surface layer; the high static friction coefficient anti-slip pad has a static friction coefficient of 0.58 to 1.4 when tested according to the ASTM D1894 standard method; the anti-slip pad with high static friction coefficient is prepared by a method comprising the following steps:
(1) Providing a high polymer material, wherein the high polymer material comprises a thermoplastic polyether ester elastomer, thermoplastic polyurethane or a combination thereof, and the breaking elongation of the high polymer material is more than 300%; the thermoplastic polyether ester elastomer has a melt index of 20g/10min or less and a Shore D hardness of 30D to 45D at 230 ℃; the thermoplastic polyurethane has a melt index of 25g/10min or less at 205 ℃ and a Shore A hardness of 60A to 95A;
(2) Melting the polymer material to obtain a melted polymer material;
(3) Adding a supercritical fluid into the melted high polymer material, and mixing to obtain a supercritical fluid mixture; and
(4) And (3) injection molding the supercritical fluid mixture to obtain the anti-slip pad with high static friction coefficient.
2. The high static coefficient of friction non-slip mat of claim 1, wherein the skin layer is a breathable skin layer having a thickness of 50 μm to 600 μm.
3. The high static coefficient of friction non-slip mat of claim 1, wherein the polymeric material comprises a combination of a thermoplastic polyetherester elastomer and a thermoplastic polyurethane, the thermoplastic polyetherester elastomer being present in an amount of greater than or equal to 10 wt.% to less than or equal to 90 wt.% and the thermoplastic polyurethane being present in an amount of greater than or equal to 10 wt.% to less than or equal to 90 wt.% based on the total weight of the polymeric material.
4. The high static coefficient of friction non-slip mat of claim 1, wherein the supercritical fluid is a supercritical fluid of nitrogen or carbon dioxide.
5. The high static coefficient of friction non-slip mat of claim 1, wherein the high static coefficient of friction non-slip mat has an average density of 0.35g/cm3 to 0.85g/cm3.
6. The high static coefficient of friction non-slip mat of claim 1, wherein the high static coefficient of friction non-slip mat has a static coefficient of friction of 0.62 to 2.3 when tested according to ASTM D1894 standard method but with a slider weight set to 1000g.
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| CN202211207160.4A CN117841470A (en) | 2022-09-30 | 2022-09-30 | High static friction coefficient anti-slip pad |
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| CN202211207160.4A CN117841470A (en) | 2022-09-30 | 2022-09-30 | High static friction coefficient anti-slip pad |
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