EVA (Ethylene Vinyl Acetate) slow-rebound soft sole or slipper and preparation method thereof

Abstract

The invention provides an EVA (Ethylene Vinyl Acetate) slow-rebound soft sole or slipper and a preparation method thereof, and belongs to the technical field of EVA foaming materials. The sole or slipper provided by the invention is prepared from the following raw materials in parts by mass: 50-80 parts of ethylene-vinyl acetate copolymer; 10 to 30 parts of polyhydric alcohol; 10 to 30 parts of organic silicon modified polyether; 1-10 parts of a composite catalyst; 10 to 50 parts of a surfactant; 1-10 parts of a cross-linking agent; and 8-15 parts of a filler. The organosilicone modified polyether is used as a low-temperature-resistant agent, so that the low-temperature resistance of soles or slippers is improved, and the problem of insufficient resilience of an EVA (Ethylene-Vinyl Acetate) material is effectively solved. Under the action of the polyalcohol and the surfactant, the compatibility of the polyether and the EVA is enhanced, and a cross-linked network structure is formed, so that the air permeability and slow rebound resilience of the sole or the slipper are improved, and the sole or the slipper is more comfortable to wear.

Description

Technical Field

[0001] The present invention relates to the technical field of EVA foaming materials, and particularly to an EVA slow rebound soft sole or slipper and a preparation method thereof. Background Art

[0002] Shoes are essential items in human life. With the continuous development of human civilization, the types of shoes have also become increasingly rich, such as casual shoes, sports shoes, canvas shoes, chemical shoes, sandals, slippers, medical shoes, and safety shoes. As sole materials for these shoes, natural materials or synthetic materials such as leather, rubber, polyvinyl chloride, and polyurethane are widely used. From the perspective of weight reduction, polyurethane materials have been widely used because of their low density and advantages in other properties such as bending resistance compared with other materials. However, with the development of modernization, people's requirements for soles are getting higher and higher. For ordinary polyurethane sole materials, due to the limitations of the material itself, during the deformation and rebound process, the rebound speed is relatively fast, which will generate a reaction force on people's feet. For example, when falling from a height, after the feet land, people will feel pain, which is caused by the too-fast rebound. Some people use softer materials that are easier to deform to make soles, but this will cause the soles to remain deformed for a long time after being stressed, resulting in the material itself deforming and forming depressions, and losing the restoring force after a long time. When people fall from a height and the feet land, the feet will feel pain due to no deformation.

[0003] Therefore, how to obtain a slow rebound soft and comfortable sole or slipper and its preparation method is a technical problem that needs to be solved currently. Summary of the Invention

[0004] The purpose of the present invention is to provide an EVA slow rebound soft sole or slipper and a preparation method thereof, which are used to solve the technical problem of poor comfort caused by the sole or slipper material being too soft or too hard.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides an EVA slow rebound soft sole or slipper, which is prepared from raw materials comprising the following mass fractions:

[0007]

[0008]

[0009] Further, the polyol includes one or more of polyethylene glycol adipate diol, polytetrahydrofuran polyol, and amino polyethylene glycol hydroxyl.

[0010] Further, the preparation method of the organosilicon-modified polyether is:

[0011] It is obtained by carrying out a hydrosilylation reaction on allyloxy polyoxyethylene ether and polymethylhydrogensiloxane under the action of a chloroplatinic acid catalyst;

[0012] The mass-volume ratio of the allyloxy polyoxyethylene ether to the polymethylhydrogensiloxane is 20-40 g: 20-25 mL, and the dosage of the chloroplatinic acid catalyst is 0.02-0.05% of the mass of the allyloxy polyoxyethylene ether.

[0013] Furthermore, the temperature of the hydrosilylation reaction is 90-110 °C, and the time of the hydrosilylation reaction is 1-4 h.

[0014] Furthermore, the composite catalyst comprises an amine catalyst and a tin catalyst, and the mass ratio of the amine catalyst to the tin catalyst is 0.5-1.5: 1.

[0015] Furthermore, the surfactant comprises one or more of fatty alcohol polyoxyethylene ether, polyethylene glycol fatty acid ester, polyether-modified silicone oil, and polyoxyethylene sorbitan fatty acid ester.

[0016] Furthermore, the crosslinking agent comprises one or more of dicumyl peroxide, bis(tert-butylperoxyisopropyl)benzene, and tert-amyl peroxy(2-ethylhexyl) carbonate;

[0017] The filler comprises one or more of calcium carbonate, white carbon black, and talcum powder.

[0018] The present invention also provides a preparation method of an EVA slow-rebound soft sole or slipper, comprising the following steps:

[0019] 1) Mix ethylene-vinyl acetate copolymer, polyol, organosilicon-modified polyether, surfactant, and filler according to mass parts, carry out internal mixing, then add a composite catalyst and a crosslinking agent and continue internal mixing, granulate the obtained blend and cool it to obtain foamed granule material;

[0020] 2) Place the foamed granule material in a mold, carry out hot pressing and molding, and cool it to obtain a foamed small blank;

[0021] 3) Place the foamed small blank in a reaction kettle, introduce supercritical gas to carry out supercritical foaming, release the pressure after gas saturation and take it out to obtain the EVA slow-rebound soft sole or slipper.

[0022] Furthermore, in the step 1), the temperature of the internal mixing is 150-180 °C, and the time of the internal mixing is 3-10 min;

[0023] The temperature of the hot pressing and molding is 130-170 °C, and the time of the hot pressing and molding is 3-5 min.

[0024] Further, the supercritical gas includes supercritical CO 2 , supercritical N 2 , supercritical ethanol or supercritical propane;

[0025] The temperature of the supercritical foaming is 60-180 °C, saturated for 2-4 h under a pressure of 10-20 MPa, and the pressure relief rate is 5-15 MPa / s.

[0026] Advantages of the present invention:

[0027] The present invention uses silicone-modified polyether as a low-temperature resistant agent, which not only improves the low-temperature resistance of the sole or slipper, but also effectively makes up for the problem of insufficient resilience performance of the EVA material. Under the action of polyol and surfactant, the compatibility of polyether and EVA is enhanced, forming a cross-linked network structure, thereby improving the air permeability and slow rebound performance of the sole or slipper, making it more comfortable to wear. Detailed implementation mode

[0028] The present invention provides an EVA slow rebound soft sole or slipper, which is prepared from raw materials comprising the following parts by mass:

[0029]

[0030] In the present invention, by mass, the dosage of the ethylene-vinyl acetate copolymer is preferably 55-75 parts, more preferably 60-70 parts.

[0031] In the present invention, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 15-25%, preferably 18-22%, more preferably 20%.

[0032] In the present invention, by mass, the dosage of the polyol is preferably 15-25 parts, more preferably 18-22 parts, and even more preferably 20 parts.

[0033] In the present invention, by mass, the dosage of the silicone-modified polyether is preferably 15-25 parts, more preferably 18-22 parts, and even more preferably 20 parts.

[0034] In the present invention, by mass, the dosage of the composite catalyst is preferably 2-9 parts, more preferably 3-8 parts, and even more preferably 4-6 parts.

[0035] In the present invention, by mass, the dosage of the surfactant is preferably 15-40 parts, more preferably 20-30 parts.

[0036] In the present invention, by mass, the dosage of the cross-linking agent is preferably 2-8 parts, more preferably 3-6 parts.

[0037] In the present invention, by mass parts, the dosage of the filler is preferably 9 to 14 parts, more preferably 10 to 12 parts.

[0038] In the present invention, the polyol includes one or more of polyethylene glycol adipate diol, polytetrahydrofuran polyol, and amino polyethylene glycol hydroxyl, preferably polyethylene glycol adipate diol.

[0039] In the present invention, the preparation method of the organosilicon-modified polyether is as follows:

[0040] Allyloxy polyoxyethylene ether and polymethylhydrogensiloxane are subjected to a hydrosilylation reaction under the action of a chloroplatinic acid catalyst to obtain;

[0041] The mass-volume ratio of the allyloxy polyoxyethylene ether to the polymethylhydrogensiloxane is 20 to 40 g: 20 to 25 mL, and the dosage of the chloroplatinic acid catalyst is 0.02 to 0.05% of the mass of the allyloxy polyoxyethylene ether.

[0042] In the present invention, the mass-volume ratio of the allyloxy polyoxyethylene ether to the polymethylhydrogensiloxane is preferably 25 to 35 g: 21 to 24 mL, more preferably 28 to 32 g: 21.5 to 22 mL.

[0043] In the present invention, the dosage of the chloroplatinic acid catalyst is 0.02 to 0.05% of the mass of the allyloxy polyoxyethylene ether, preferably 0.03 to 0.04%.

[0044] In the present invention, the temperature of the hydrosilylation reaction is 90 to 110 °C, preferably 95 to 105 °C, more preferably 100 °C; the time of the hydrosilylation reaction is 1 to 4 h, preferably 2 to 3 h.

[0045] In the present invention, the composite catalyst includes an amine catalyst and a tin catalyst, preferably A-33 catalyst and stannous octoate;

[0046] The mass ratio of the amine catalyst to the tin catalyst is 0.5 to 1.5:1, preferably 0.8 to 1.2:1, more preferably 0.9 to 1.1:1.

[0047] In the present invention, the surfactant includes one or more of fatty alcohol polyoxyethylene ether, polyethylene glycol fatty acid ester, polyether-modified silicone oil, and polyoxyethylene sorbitan fatty acid ester, preferably one or more of AEO-3, AEO-9, PEG-400 monostearate, Tween20, Tween40, Tween60, and Tween80.

[0048] In the present invention, the crosslinking agent includes one or more of dicumyl peroxide, bis(tert-butylperoxyisopropyl)benzene, and tert-amyl peroxy (2-ethylhexyl) carbonate, preferably dicumyl peroxide.

[0049] In the present invention, the filler includes one or more of calcium carbonate, silica, and talcum powder, preferably calcium carbonate and silica.

[0050] The present invention also provides a method for preparing an EVA slow-rebound soft sole or slipper, comprising the following steps:

[0051] 1) Mix ethylene-vinyl acetate copolymer, polyol, organosilicon-modified polyether, surfactant, and filler by mass parts, then conduct kneading, and then add a composite catalyst and a crosslinking agent to continue kneading. After granulating and cooling the obtained blend, foamed granule material is obtained;

[0052] 2) Place the foamed granule material in a mold, and obtain a foamed blank after hot pressing and cooling;

[0053] 3) Place the foamed blank in a reaction kettle, introduce supercritical gas for supercritical foaming, and after the gas is saturated, relieve the pressure and take out to obtain the EVA slow-rebound soft sole or slipper.

[0054] In the present invention, in step 1), the kneading temperature is 150-180°C, preferably 160-175°C, and more preferably 170°C; the kneading time is 3-10 min, preferably 4-9 min, and more preferably 6-8 min.

[0055] In the present invention, the hot pressing temperature is 130-170°C, preferably 140-160°C, and more preferably 150°C; the hot pressing time is 3-5 min, preferably 4 min.

[0056] In the present invention, the supercritical gas includes supercritical CO 2 , supercritical N 2 , supercritical ethanol or supercritical propane, preferably supercritical N 2 ;

[0057] The supercritical foaming temperature is 60-180°C, preferably 80-160°C, and more preferably 100-150°C; it is saturated for 2-4 h under a pressure of 10-20 MPa, and the pressure relief rate is 5-15 MPa / s, preferably 10 MPa / s.

[0058] The technical solutions provided by the present invention will be described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0059] Example 1

[0060] Preparation of silicone-modified polyether:

[0061] 30 g of allyloxy polyoxyethylene ether and 21 mL of polymethylhydrosiloxane were subjected to hydrosilylation reaction at 100 °C for 2 h under the action of chloroplatinic acid catalyst to obtain silicone-modified polyether, wherein the dosage of chloroplatinic acid catalyst was 0.03% of the mass of allyloxy polyoxyethylene ether.

[0062] Preparation of EVA slow rebound soft sole or slipper:

[0063] 1) 68 parts of ethylene-vinyl acetate copolymer (VA content 20%), 15 parts of polyethylene adipate glycol, 15 parts of silicone-modified polyether, 30 parts of surfactant (AEO-9 and PEG-400 monostearate, mass ratio 1:1) and 10 parts of silica were mixed and kneaded at 160 °C for 3 min, then 5 parts of composite catalyst (A-33 catalyst and stannous octoate, mass ratio 1:1) and 5 parts of dicumyl peroxide were added and kneaded for another 5 min to obtain a blend; the blend was placed in a granulator, granulated and cooled to obtain foamed pellet material;

[0064] 2) The foamed pellet material was placed in a mold and hot-pressed at 145 °C for 3 min to form, and after cooling, a foamed blank was obtained;

[0065] 3) The foamed blank was placed in a supercritical reactor, and supercritical N 2 was introduced, and supercritical foaming was carried out at 90 °C and 15 MPa for 2 h. After waiting for gas saturation, it was depressurized and taken out at a rate of 5 MPa / s to obtain an EVA slow rebound soft sole or slipper.

[0066] Example 2

[0067] Preparation of EVA slow rebound soft sole or slipper:

[0068] 1) 80 parts of ethylene-vinyl acetate copolymer (VA content 18%), 25 parts of polytetrahydrofuran polyol, 10 parts of silicone-modified polyether, 50 parts of surfactant (AEO-9 and Tween20, mass ratio 1:1) and 15 parts of calcium carbonate were mixed and kneaded at 170 °C for 3 min, then 8 parts of composite catalyst (A-33 catalyst and stannous octoate, mass ratio 1:1) and 8 parts of di-tert-butyl peroxyisopropylbenzene were added and kneaded for another 5 min to obtain a blend; the blend was placed in a granulator, granulated and cooled to obtain foamed pellet material;

[0069] 2) The foamed pellet material was placed in a mold and hot-pressed at 150 °C for 3 min to form, and after cooling, a foamed blank was obtained;

[0070] 3) Place the foaming blank in a supercritical reactor, introduce supercritical CO 2 , carry out supercritical foaming at 80 °C and 10 MPa for 2 h, wait for gas saturation and then depressurize and take out at a rate of 5 MPa / s to obtain an EVA slow-rebound soft sole or slipper.

[0071] The preparation of the silicone-modified polyether is the same as in Example 1.

[0072] Example 3

[0073] Preparation of EVA slow-rebound soft sole or slipper:

[0074] 1) Mix 75 parts of ethylene-vinyl acetate copolymer (VA content is 22%), 25 parts of polyethylene adipate glycol, 5 parts of silicone-modified polyether, 35 parts of surfactant (AEO-3 and PEG-400 monostearate, mass ratio 1:1) and 10 parts of silica, then carry out internal mixing at 165 °C for 3 min, then add 10 parts of composite catalyst (A-33 catalyst and stannous octoate, mass ratio 1:1) and 10 parts of tert-amyl peroxy(2-ethylhexyl) carbonate and continue internal mixing for 5 min to obtain a blend; place the blend in a granulator, granulate and then cool to obtain foaming granule material;

[0075] 2) Place the foaming granule material in a mold, carry out hot pressing at 145 °C for 3 min to form, and cool to obtain a foaming blank;

[0076] 3) Place the foaming blank in a supercritical reactor, introduce supercritical propane, carry out supercritical foaming at 90 °C and 15 MPa for 2 h, wait for gas saturation and then depressurize and take out at a rate of 5 MPa / s to obtain an EVA slow-rebound soft sole or slipper.

[0077] The preparation of the silicone-modified polyether is the same as in Example 1.

[0078] Example 4

[0079] Preparation of EVA slow-rebound soft sole or slipper:

[0080] 1) Mix 55 parts of ethylene-vinyl acetate copolymer (VA content is 25%), 30 parts of polyethylene adipate glycol, 12 parts of silicone-modified polyether, 32 parts of surfactant (Tween80 and PEG-400 monostearate, mass ratio 1:1) and 13 parts of silica, then carry out internal mixing at 160 °C for 3 min, then add 9 parts of composite catalyst (A-33 catalyst and stannous octoate, mass ratio 1:1) and 9 parts of dicumyl peroxide and continue internal mixing for 5 min to obtain a blend; place the blend in a granulator, granulate and then cool to obtain foaming granule material;

[0081] 2) Place the foamed granulated material in a mold, hot press it at 145 °C for 3 min to form, and obtain a foamed blank after cooling;

[0082] 3) Place the foamed blank in a supercritical reaction kettle, introduce supercritical ethanol, carry out supercritical foaming at 80 °C and 15 MPa for 2 h, wait for the gas to be saturated and then relieve the pressure and take it out at a speed of 8 MPa / s to obtain an EVA slow-rebound soft sole or slipper.

[0083] The preparation of the silicone-modified polyether is the same as that in Example 1.

[0084] Example 5

[0085] Preparation of EVA slow-rebound soft sole or slipper:

[0086] 1) Mix 70 parts of ethylene-vinyl acetate copolymer (VA content is 23%), 30 parts of polytetrahydrofuran polyol, 20 parts of silicone-modified polyether, 50 parts of surfactant (AEO-9 and Tween40, mass ratio 1:1), 5 parts of white carbon black and 5 parts of talc powder, then carry out internal mixing at 160 °C for 3 min, and then add 10 parts of composite catalyst (A-33 catalyst and stannous octoate, mass ratio 1:1) and 8 parts of dicumyl peroxide and continue internal mixing for 5 min to obtain a blend; place the blend in a granulator, granulate and then cool to obtain foamed granulated material;

[0087] 2) Place the foamed granulated material in a mold, hot press it at 160 °C for 3 min to form, and obtain a foamed blank after cooling;

[0088] 3) Place the foamed blank in a supercritical reaction kettle, introduce supercritical N 2 , carry out supercritical foaming at 90 °C and 15 MPa for 2 h, wait for the gas to be saturated and then relieve the pressure and take it out at a speed of 5 MPa / s to obtain an EVA slow-rebound soft sole or slipper.

[0089] The preparation of the silicone-modified polyether is the same as that in Example 1.

[0090] Comparative Example 1

[0091] Same as Example 1, the difference is that the silicone-modified polyether is replaced by a conventional polyether GLR2000.

[0092] Comparative Example 2

[0093] Same as Example 2, the difference is that no polyol is added.

[0094] Comparative Example 3

[0095] Same as Example 3, the difference is that no surfactant is added.

[0096] Comparative Example 4

[0097] Same as Example 4, except that the amount of organosilicon-modified polyether is 60 parts.

[0098] The soles made from the above examples and comparative examples were made into the same size with a thickness of 5 cm and subjected to performance tests:

[0099] 1. Density test: Tested in accordance with HG / T2872-1997;

[0100] 2. Air permeability test: Tested in accordance with GB / T 7755-2003;

[0101] 3. Impact resilience test: Tested in accordance with GB / T1681-1991, with an impact energy of 0.5 J, a sphere diameter of 15 mm, and an impact mass of 100 - 350 g;

[0102] The test results are shown in Table 1 below.

[0103] Table 1 Test Results

[0104] Project <![CDATA[Density g / cm 3 > <![CDATA[Air permeability mL / cm 2 > Impact resilience % Example 1 0.21 23.8 67.1 Example 2 0.20 22.5 65.8 Example 3 0.22 23.1 69.2 Example 4 0.21 23.0 66.5 Example 5 0.32 22.6 64.3 Comparative Example 1 0.36 20.3 57.1 Comparative Example 2 0.35 19.1 60.5 Comparative Example 3 0.32 15.8 63.3 Comparative Example 4 0.41 20.5 36.8

[0105] The slow rebound test was carried out on the soles made from the examples and comparative examples:

[0106] 4. Thickness deformation rate test: The soles made were subjected to pressure tests at 0.5 kPa, 1.5 kPa, 2.5 kPa, 3.5 kPa, and 4.5 kPa to test their thickness deformation rates. The test results are shown in Table 2 below;

[0107] Deformation rate = (original thickness - deformed thickness) / original thickness;

[0108] 5. Thickness deformation recovery time: An external force was applied to the soles made to cause a deformation with a thickness deformation rate of 20%, and then the external force was removed, and the time taken for recovery was recorded. For the same sole, after 100 experiments, the times at the 1st, 10th, 50th, and 100th times were recorded. The test results are shown in Table 3 below.

[0109] Table 2 Slow Rebound Test Results

[0110]

[0111]

[0112] Table 3 Test Results

[0113] Project First time Tenth time Fiftieth time Hundredth time Example 1 6s 11s 12s 12s Example 2 5s 7s 10s 11s Example 3 7s 10s 10s 12s Example 4 8s 10s 10s 12s Example 5 5s 8s 9s 10s Comparative Example 1 10s 13s 15s 15s Comparative Example 2 9s 15s 20s Non-recovery Comparative Example 3 15s 20s 25s Non-recovery Comparative Example 4 12s 15s 15s Non-recovery

[0114] According to the test results in Table 1, the present invention significantly improves the resilience performance of the material by introducing organosilicon-modified polyether into the EVA material. However, the addition amount of organosilicon-modified polyether is not the more the better. Due to its inherent softness, excessive addition (as shown in Comparative Example 4) will lead to a significant decrease in the resilience performance of the sole, and there may be irreversible depressions after long-term wearing. In addition, if no surfactant is added in this material system, the compatibility between EVA and organosilicon-modified polyether will be affected, resulting in the hardening of the material, an increase in density, and a decrease in air permeability. Similarly, the absence of polyol will also make the sole material harden and the resilience performance decline. When using conventional polyether, the resilience performance of the sole will also decline, the density will increase, and the comfort will decrease.

[0115] It can be seen from the slow rebound test performances in Table 2 and Table 3 that the soles or slippers prepared by the present invention have the characteristics of slow rebound. When the force is between 0.5 and 1.5 kPa, the deformation rate is between 0.5 and 2%, and when the force increases to 2.5 to 4.5 kPa, the deformation rate can reach 9 to 21%, playing a role in buffering and absorbing capacity. For the sole made in Comparative Example 2, due to the absence of polyol, the compatibility of the material itself is poor, the softness decreases, and after multiple deformation tests, the material hardly recovers and loses its resilience, failing to meet the usage requirements of the sole. Thus, it can be seen that in the present invention, organosilicon-modified polyether and EVA can be well compatible under the action of polyol and surfactant. Polyol not only improves the wear resistance and anti-aging performance of the material, but also can chemically react with EVA to form a crosslinked network in the molecular chain segment structure, thereby improving the air permeability, slow rebound performance and comfort of the sole or slipper.

[0116] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An EVA slow-rebound soft sole or slipper, characterized in that: Prepared from the following raw materials in parts by weight:

2. The EVA slow-rebound soft sole or slipper according to claim 1, characterized in that: The polyol comprises one or more of polyethylene adipate glycol, polytetramethylene glycol and aminopolyethylene glycol hydroxyl.

3. The EVA slow-rebound soft sole or slipper according to claim 1 or 2, characterized in that: The preparation method of the organosilicon-modified polyether is: The allyloxy polyoxyethylene ether and polymethyl hydrogen siloxane are subjected to a hydrosilylation reaction under the action of chloroplatinic acid catalyst to obtain the product; The mass volume ratio of the allyloxy polyoxyethylene ether to the polymethyl hydrogen siloxane is 20-40 g: 20-25 mL, and the amount of the chloroplatinic acid catalyst is 0.02-0.05% of the mass of the allyloxy polyoxyethylene ether.

4. The EVA slow-rebound soft sole or slipper according to claim 3, characterized in that: The temperature of the hydrosilylation reaction is 90 to 110° C., and the time of the hydrosilylation reaction is 1 to 4 hours.

5. The EVA slow-rebound soft sole or slipper according to claim 1 or 4, characterized in that: The composite catalyst comprises an amine catalyst and a tin catalyst, and the mass ratio of the amine catalyst to the tin catalyst is 0.5-1.5:

1.

6. The EVA slow-rebound soft sole or slipper according to claim 5, characterized in that: The surfactant comprises one or more of fatty alcohol polyoxyethylene ether, polyethylene glycol fatty acid ester, polyether modified silicone oil and polyoxyethylene sorbitan fatty acid ester.

7. The EVA slow-rebound soft sole or slipper according to claim 1 or 6, characterized in that: The cross-linking agent comprises one or more of dicumyl peroxide, di-tert-butyl peroxycumene and tert-amyl peroxy (2-ethylhexyl) carbonate; The filler comprises one or more of calcium carbonate, white carbon black and talc.

8. The method for preparing the EVA slow-rebound soft sole or slipper according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) mixing ethylene-vinyl acetate copolymer, polyol, organosilicon-modified polyether, surfactant and filler according to weight fractions and kneading them, then adding composite catalyst and crosslinking agent and continuing kneading, granulating the obtained blend and cooling it to obtain foamed granular material; 2) placing the foamed granular material in a mold, hot pressing and cooling to obtain a foamed blank; 3) placing the foamed green sheet in a reactor and introducing supercritical gas to perform supercritical foaming, and releasing the pressure after the gas is saturated, thereby obtaining an EVA slow-rebound soft sole or slipper.

9. The preparation method according to claim 8, characterized in that: In the step 1), the banburying temperature is 150-180° C., and the banburying time is 3-10 min; The temperature of the hot pressing molding is 130-170° C., and the time of the hot pressing molding is 3-5 minutes.

10. The preparation method according to claim 9, characterized in that: The supercritical gas comprises supercritical CO2, supercritical N2, supercritical ethanol or supercritical propane; The supercritical foaming temperature is 60-180° C., the saturation is carried out for 2-4 hours at a pressure of 10-20 MPa, and the pressure release rate is 5-15 MPa / s.

Images