阅读说明：本技术 一种具有自然透光性的鞋中底材料及其制备方法 (Insole material with natural light transmission and preparation method thereof ) 是由 杨君其 董斌 王有承 韩健 黄守东 莫旸 于 2020-06-02 设计创作，主要内容包括：本发明提供了一种具有自然透光性的鞋中底材料,包括：具有透光纹理的鞋中底主体；均匀分布在所述鞋中底主体上的气孔；所述具有透光纹理的鞋中底主体由热塑性聚胺酯弹性体混合物料经超临界挤出模压成型而成。与现有技术相比,本发明提供的具有自然透光性的鞋中底材料采用超临界挤出模压成型得到具有透光纹理的鞋中底主体,再设置均匀分布的气孔减少产品内部空洞,使材料更稳定、不会塌陷；该产品在具有良好缓震性和回弹性基础上,还具有自然透光性,能够获得不可替代的外观纹路及光感下的奇特景观,且性价比高。(The invention provides a midsole material with natural light transmission, which comprises the following components: a midsole body having a light transmitting texture; air holes uniformly distributed on the insole main body; the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding. Compared with the prior art, the insole material with natural light transmittance provided by the invention is molded by supercritical extrusion and compression to obtain an insole main body with light transmittance texture, and uniformly distributed air holes are arranged to reduce the internal cavities of the product, so that the material is more stable and cannot collapse; the product has natural light transmission on the basis of good shock absorption and rebound resilience, can obtain irreplaceable appearance lines and peculiar landscapes under light sensation, and has high cost performance.)

1. A midsole material having natural light transmission properties, comprising:

a midsole body having a light transmitting texture;

air holes uniformly distributed on the insole main body;

the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding.

2. The midsole material having natural light transmittance according to claim 1, wherein the midsole body having the light transmittance texture is a ventral midsole half sole or a full midsole.

3. The midsole material of claim 2, wherein the belly filling midsole ball comprises a cushioning stabilizer layer adjacent the foot portion and a tear resistant layer adjacent the outsole portion; the cushioning stabilizing layer and the anti-tearing layer are of an integral structure, and the edge of the cushioning stabilizing layer is within the edge of the anti-tearing layer; the cushioning stabilizing layer is provided with transverse grains; the edge portion of the tear resistant layer forms an exposed wall edge.

4. The midsole material having a natural light transmittance according to claim 2, wherein the full midsole has an integral structure including a forefoot portion, a middle connection portion, a heel portion, and sidewall portions disposed at outer sides of the forefoot portion, the middle connection portion, and the heel portion, wherein a height of the sidewall portion at the outer side of the forefoot portion is lower than a height of the sidewall portion at the outer side of the heel portion; the half sole part is provided with transverse grains; the middle connecting part is provided with a hollow area; the heel portion is provided with a plurality of post hole locations.

5. The midsole material of claim 1, wherein the thermoplastic polyurethane elastomer blend comprises the following components:

100 parts of a thermoplastic polyurethane elastomer main material;

1-2 parts of nucleating agent;

0.5 to 1.5 parts by weight of a flow agent;

0.2 to 0.8 weight portion of yellow-resistant agent;

1 to 1.5 parts by weight of a foaming agent.

6. A method for preparing the natural light-transmitting midsole material of any one of claims 1 to 5, comprising the steps of:

a) carrying out supercritical extrusion and compression molding on the thermoplastic polyurethane elastomer mixed material to obtain a shoe insole main body with light-transmitting textures;

b) and b), filling air holes in the insole main body with the light-transmitting texture obtained in the step a) to obtain the insole material with natural light transmission.

7. The preparation method according to claim 6, wherein the supercritical extrusion molding process in step a) is specifically as follows:

drying and dehumidifying the thermoplastic polyurethane elastomer mixed material, and then sequentially carrying out supercritical extrusion and compression molding to obtain a shoe insole main body with light-transmitting textures;

the extrusion die for supercritical extrusion compression molding comprises a large-hole extrusion die, a small-hole extrusion die and a large-hole and small-hole combined extrusion die.

8. The preparation method of claim 7, wherein the dehumidification temperature for drying and dehumidifying in the step a) is 170-190 ℃, the drying temperature is 70-90 ℃, and the drying time is 100-140 min.

9. The preparation method according to claim 7, wherein the supercritical extrusion in step b) is carried out at a temperature of 190 ℃ to 205 ℃, a pressure of 5MPa to 10MPa, an extrusion rotation speed of 100r/min to 140r/min, a discharge amount of 10kg/h to 20kg/h, an air injection amount of 4mL/min to 6mL/min, and an air injection pressure of 10MPa to 14 MPa.

10. The method according to claim 7, wherein the pressure for the press molding in step b) is 4kg/cm²～6kg/cm²The temperature of the forming die is 40-80 ℃;

the molding time comprises the following steps: heating and shaping for 400-700 s in the mold, and naturally cooling and shaping for 10-14 h.

Technical Field

The invention relates to the technical field of shoe product manufacturing, in particular to a midsole material with natural light transmission and a preparation method thereof.

Background

The running shoes are mainly divided into three parts: the shoe comprises a vamp (Upper), a Midsole (Midsole) and an Outsole (Outsole), wherein the Midsole is used as the soul of the running shoe and plays an extremely important role in improving the quality and value of shoe products. At present, because of its good flexibility and elasticity and low cost, EVA material is one of the midsole materials widely used in various shoe factories; the E-TPU material which embodies BOOTS technology in the non-EVA middle sole has wide market prospect.

The BOOTS science and technology is the insole that converts solid particle material (TPU) inflation back into thousands of little energy capsules in order to make the shoes money, because the uniqueness of structure, every little capsule can both effectively gather and release the energy to provide good bradyseism and resilience force. However, the preparation method is a two-stage process flow, has limitations, is not high in cost performance, is single in particle appearance, brings aesthetic fatigue, and is difficult to break through in the aspect of light transmittance.

Disclosure of Invention

In view of the above, the present invention aims to provide a midsole material with natural light transmittance and a preparation method thereof, and the midsole material provided by the present invention has natural light transmittance on the basis of good shock absorption and rebound resilience, can obtain irreplaceable appearance lines and peculiar landscapes under light sensation, and has high cost performance.

The invention provides a midsole material with natural light transmission, which comprises the following components:

a midsole body having a light transmitting texture;

air holes uniformly distributed on the insole main body;

the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding.

Preferably, the midsole body having the light-transmitting texture is a ventral midsole half sole or a full midsole.

Preferably, the front sole of the belly filling midsole comprises a cushioning stabilizing layer at a foot rest part and an anti-tearing layer at an outer bottom part; the cushioning stabilizing layer and the anti-tearing layer are of an integral structure, and the edge of the cushioning stabilizing layer is within the edge of the anti-tearing layer; the cushioning stabilizing layer is provided with transverse grains; the edge portion of the tear resistant layer forms an exposed wall edge.

Preferably, the full midsole is of an integral structure and comprises a half sole part, a middle connecting part, a heel part and side wall parts arranged on the outer sides of the half sole part, the middle connecting part and the heel part, wherein the height of the side wall part on the outer side of the half sole part is lower than that of the side wall part on the outer side of the heel part; the half sole part is provided with transverse grains; the middle connecting part is provided with a hollow area; the heel portion is provided with a plurality of post hole locations.

Preferably, the thermoplastic polyurethane elastomer mixture comprises the following components:

100 parts of a thermoplastic polyurethane elastomer main material;

1-2 parts of nucleating agent;

0.5 to 1.5 parts by weight of a flow agent;

0.2 to 0.8 weight portion of yellow-resistant agent;

1 to 1.5 parts by weight of a foaming agent.

The invention also provides a preparation method of the insole material with natural light transmission in the technical scheme, which comprises the following steps:

a) carrying out supercritical extrusion and compression molding on the thermoplastic polyurethane elastomer mixed material to obtain a shoe insole main body with light-transmitting textures;

b) and b), filling air holes in the insole main body with the light-transmitting texture obtained in the step a) to obtain the insole material with natural light transmission.

Preferably, the supercritical extrusion molding process in step a) specifically comprises the following steps:

drying and dehumidifying the thermoplastic polyurethane elastomer mixed material, and then sequentially carrying out supercritical extrusion and compression molding to obtain a shoe insole main body with light-transmitting textures;

the extrusion die for supercritical extrusion compression molding comprises a large-hole extrusion die, a small-hole extrusion die and a large-hole and small-hole combined extrusion die.

Preferably, the dehumidifying temperature for drying and dehumidifying in the step a) is 170-190 ℃, the drying temperature is 70-90 ℃, and the drying time is 100-140 min.

Preferably, the supercritical extrusion temperature in the step b) is 190-205 ℃, the pressure is 5-10 MPa, the extrusion rotation speed is 100-140 r/min, the blanking amount is 10-20 kg/h, the gas injection amount is 4-6 mL/min, and the gas injection pressure is 10-14 MPa.

Preferably, the pressure for the compression molding in step b) is 4kg/cm²～6kg/cm²The temperature of the forming die is 40-80 ℃;

the molding time comprises the following steps: heating and shaping for 400-700 s in the mold, and naturally cooling and shaping for 10-14 h.

The invention provides a midsole material with natural light transmission, which comprises the following components: a midsole body having a light transmitting texture; air holes uniformly distributed on the insole main body; the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding. Compared with the prior art, the insole material with natural light transmittance provided by the invention is molded by supercritical extrusion and compression to obtain an insole main body with light transmittance texture, and uniformly distributed air holes are arranged to reduce the internal cavities of the product, so that the material is more stable and cannot collapse; the product has natural light transmission on the basis of good shock absorption and rebound resilience, can obtain irreplaceable appearance lines and peculiar landscapes under light sensation, and has high cost performance.

In addition, the preparation method provided by the invention adopts one-step extrusion molding to finish the preparation of the shoe midsole material, has simple process, short flow and high efficiency, does not need vulcanization, can realize the change of light-transmitting textures by changing an extrusion die, increases the diversity of special appearances of products and has wide application prospect.

Drawings

FIG. 1 is a schematic partial view of a midsole material having natural light transmittance according to an embodiment of the present invention;

FIG. 2 is a schematic front view of a midsole material having natural light transmittance, which is provided by an embodiment of the present invention and uses a forefoot of a middle sole for abdomen filling as a main body of the middle sole;

FIG. 3 is a schematic reverse side view of a midsole material having natural light transmittance, using a forefoot portion of a belly filling midsole as a midsole body according to an embodiment of the present invention;

FIG. 4 is a schematic front view of a midsole material having natural light transmittance, using a full midsole as a midsole body according to an embodiment of the present invention;

FIG. 5 is a schematic representation of a reverse structure of a natural light transmitting midsole material having a full midsole as the midsole body according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an extrusion mold for supercritical extrusion molding and a texture effect diagram of a finished product according to an embodiment of the present invention;

FIG. 7 is a schematic view illustrating a process of performing supercritical extrusion molding to obtain a midsole body having a light-transmitting texture according to an embodiment of the present invention;

fig. 8 is a diagram illustrating a light transmission effect of a midsole material having natural light transmission properties, which is provided in example 1 of the present invention and uses a forefoot of a middle sole for abdomen filling as a midsole body;

fig. 9 is a diagram illustrating the light transmission effect of the midsole material having natural light transmission properties, which is provided by embodiment 2 of the present invention and uses the full midsole as the midsole body.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a midsole material with natural light transmission, which comprises the following components:

a midsole body having a light transmitting texture;

air holes uniformly distributed on the insole main body;

the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding.

In the invention, the insole material with natural light transmission comprises an insole main body and air holes; wherein, the shoe insole main body has light transmission texture, the gas pocket evenly distributed is in on the shoe insole main body. Referring to fig. 1, fig. 1 is a schematic partial structural view of a midsole material with natural light transmittance according to an embodiment of the present invention, in which 1 is a midsole main body, 2 is a light-transmitting texture, and 3 is an air hole.

In the present invention, the midsole body having the light transmitting texture is preferably a ventral midsole half sole or a full midsole; the half sole of the middle sole for filling the abdomen is used as the half sole part of the middle sole for filling the abdomen, and the whole middle sole is the whole middle sole.

In the present invention, the front sole of the belly filling midsole preferably includes a cushioning stabilizing layer adjacent to the foot portion and a tear resistant layer adjacent to the outer bottom portion; the cushioning stabilizing layer and the anti-tearing layer are of an integral structure, and the edge of the cushioning stabilizing layer is within the edge of the anti-tearing layer; in practical application, the part between the edge of the cushioning and stabilizing layer and the edge of the anti-tear layer can be covered by other EVA materials, so that the joint effect is achieved, and the abdomen filling use requirement is met. In the invention, the cushioning stabilizing layer is preferably provided with transverse stripes; the edge part of the anti-tear layer forms an exposed wall edge, and the visual technological effect is achieved.

In the invention, after uniformly distributed air holes are arranged on the half sole of the middle sole for filling abdomen, a middle sole material with natural light transmittance is formed, as shown in figures 2-3; fig. 2 is a schematic front structural view of a midsole material having natural light transmittance and using a forefoot sole as a midsole body according to an embodiment of the present invention, and fig. 3 is a schematic back structural view of a midsole material having natural light transmittance and using a forefoot sole as a midsole body according to an embodiment of the present invention; wherein, 1 is a cushioning stable layer, 2 is an anti-tearing layer, 3 is a cross grain, 4 is an exposed wall edge, 5 is a light-transmitting grain, and 6 is an air hole.

In the invention, the whole midsole is preferably of an integral structure and comprises a half sole part, a middle connecting part, a heel part and side wall parts arranged at the outer sides of the half sole part, the middle connecting part and the heel part; the side wall part is slightly higher than the half sole part, the middle connecting part and the heel part; wherein, the height of the side wall part at the outer side of the half sole part is lower than that of the side wall part at the outer side of the heel part. In the invention, the half sole part is provided with transverse grains; the middle connecting part is provided with a hollow area, and air holes can be added in the hollow area without damaging the attractiveness; the heel portion is provided with a plurality of post hole locations. In addition, light can be arranged at the hollow-out area of the middle connecting part, and the light-transmitting effect of the insole is fully embodied.

In the invention, after the air holes are uniformly distributed in the whole midsole, a midsole material with natural light transmittance is formed, as shown in fig. 4-5; fig. 4 is a schematic front structural view of a midsole material having natural light transmittance and provided by an embodiment of the present invention, in which a full midsole is used as a midsole body, and fig. 5 is a schematic back structural view of a midsole material having natural light transmittance and provided by an embodiment of the present invention, in which a full midsole is used as a midsole body; wherein, 1 is half sole part, 2 is middle part connecting part, 3 is heel part, 4 is side wall part, 5 is horizontal line, 6 is fretwork district, 7 is the post hole site, 8 is light-transmitting texture, 9 is the gas pocket.

In the invention, the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion; the thermoplastic polyurethane elastomer mixture preferably comprises the following components:

100 parts of a thermoplastic polyurethane elastomer main material;

1-2 parts of nucleating agent;

0.5 to 1.5 parts by weight of a flow agent;

0.2 to 0.8 weight portion of yellow-resistant agent;

1 to 1.5 parts by weight of a foaming agent.

In the invention, the main material (TPU main material for short) of the thermoplastic polyurethane elastomer can realize supercritical foaming and can be recycled, and EVA materials are basically chemically foamed and cannot be recycled; compared with EVA materials, the TPU materials have better elasticity, weather resistance, low temperature resistance and compression deformation rate, and can keep the refractive property of raw materials after foaming and forming, and have light permeability, irregular grains are generated, and special appearance is realized. The source of the TPU main material in the present invention is not particularly limited and commercially available products known to those skilled in the art may be used. In the invention, the thermoplastic polyurethane elastomer mixture comprises 100 parts by weight of TPU main material.

In the present invention, the nucleating agent is preferably selected from one or more of montmorillonite, titanium dioxide, calcium carbonate, white carbon black, microcrystalline cellulose, carbon nanotube and graphene, and more preferably titanium dioxide. The source of the nucleating agent is not particularly limited, and commercially available products of the montmorillonite, titanium dioxide, calcium carbonate, white carbon black, microcrystalline cellulose, carbon nanotube and graphene, which are well known to those skilled in the art, can be adopted. In the invention, the nucleating agent mainly serves as a filler, is dispersed in a matrix and is beneficial to nucleating and crystallizing and improving the strength of the resin. In the invention, the nucleating agent is preferably a nano nucleating agent, the energy barrier between the nano nucleating agent particles and the interface of the polymer melt is low, the nucleation of the foam cells is easy to occur around the particles, and the nucleation process is promoted, so that the size of the foam cells is greatly reduced, and the density of the foam cells is improved; the size of the nano-nucleating agent is preferably below 500nm, more preferably below 200 nm. In the present invention, the thermoplastic polyurethane elastomer mixture includes 1 to 2 parts by weight of the nucleating agent, preferably 1.3 to 1.5 parts by weight.

In the present invention, the flow agent is preferably selected from erucamide lubricants. The source of the flow agent is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the thermoplastic polyurethane elastomer mixture includes 0.5 to 1.5 parts by weight of a flow agent, preferably 1 part by weight.

In the present invention, the anti-yellowing agent is preferably selected from one or more of an antioxidant 246, an ultraviolet light absorber 328, and an ultraviolet light absorber VSU, and more preferably, the ultraviolet light absorber VSU. The source of the yellowing resistance agent is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the thermoplastic polyurethane elastomer mixture includes 0.2 to 0.8 parts by weight of the anti-yellowing agent, preferably 0.5 parts by weight.

In the present invention, the blowing agent is preferably selected from dibutyltin dilaurate, CO₂And C, more preferably C. The source of the blowing agent is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the thermoplastic polyurethane elastomer mixture includes 1 to 1.5 parts by weight of a foaming agent, preferably 1.2 to 1.3 parts by weight.

In the invention, the thermoplastic polyurethane elastomer mixture is formed by mixing the components; the mixing mode is not particularly limited, and the components can be uniformly mixed by adopting a stirring technical scheme familiar to the technical personnel in the field. The invention adopts the components with the specific content to be suitable for supercritical extrusion molding forming, thereby completing the preparation of the shoe midsole material in a one-stop way.

The insole material with natural light transmittance provided by the invention is molded by supercritical extrusion and compression molding to obtain an insole main body with light transmittance texture, and then uniformly distributed air holes are arranged to reduce the internal cavities of the product, so that the material is more stable and cannot collapse; the product has natural light transmission on the basis of good shock absorption and rebound resilience, irreplaceable appearance lines and peculiar landscapes under light sensation can be obtained, and the product has the advantages of low temperature resistance, excellent compression resistance, small density, comfort, stability, durability and high overall cost performance. On the basis, the running shoes using the insole material with natural light transmission provided by the invention are more comfortable, have better energy rebound and have stronger visual impact.

The invention also provides a preparation method of the insole material with natural light transmission in the technical scheme, which comprises the following steps:

a) carrying out supercritical extrusion and compression molding on the thermoplastic polyurethane elastomer mixed material to obtain a shoe insole main body with light-transmitting textures;

b) and b), filling air holes in the insole main body with the light-transmitting texture obtained in the step a) to obtain the insole material with natural light transmission.

The invention firstly carries out supercritical extrusion molding on the thermoplastic polyurethane elastomer mixture to obtain the insole main body with the light-transmitting texture. In the present invention, the thermoplastic polyurethane elastomer mixture is the same as that in the above technical solution, and is not described herein again.

In the present invention, the supercritical extrusion molding process preferably includes:

drying and dehumidifying the thermoplastic polyurethane elastomer mixed material, and then sequentially carrying out supercritical extrusion and compression molding to obtain a shoe insole main body with light-transmitting textures;

in the invention, the dehumidification temperature for drying and dehumidifying is preferably 170-190 ℃, and more preferably 180 ℃; the drying temperature for drying and dehumidifying is preferably 70-90 ℃, and more preferably 80 ℃; the drying time for drying and dehumidifying is preferably 100min to 140min, and more preferably 120 min.

In the present invention, the supercritical extrusion preferably specifically comprises the steps of:

firstly, injecting other gases such as carbon dioxide or nitrogen in a supercritical state into a device simultaneously in a discharging process, fully and uniformly mixing/diffusing the gases and a molten raw material to form single-phase mixed sol, and then introducing the sol into an extrusion die to generate large pressure drop of the sol, so that the gases are separated out to form a large number of bubble cores; in the subsequent cooling and forming process, bubble nuclei in the sol continuously grow up and are formed, and finally, a finished product of microcellular foaming is obtained; the finished product of the microcellular foam has high specific strength and high cost performance, can greatly improve the dimensional accuracy of the finished product, and shortens the development cycle of the product; the residual stress of the product is greatly reduced, and the warping deformation of the finished product is reduced and improved; eliminating surface sink marks; the raw materials are effectively saved, and the product quality is reduced; the foaming agent has low cost and is environment-friendly; the fluidity of the mixed sol is enhanced by 20 to 40 percent, the viscosity is low, and the mold filling is easy; the supercritical gas equipment has simple process, low cost and environmental protection. The device for supercritical extrusion is not particularly limited in the invention, and a heating inflation extrusion foaming device well known to those skilled in the art is adopted.

In the invention, the extrusion die for supercritical extrusion compression molding preferably comprises a large-hole extrusion die, a small-hole extrusion die and a large-hole and small-hole combined extrusion die; the finished product obtained by the macroporous extrusion die has loose texture, thick lines, few bubbles and good resilience; the finished product obtained by the small-hole extrusion die is relatively dense in texture and fine in line, and in the manufacturing process, the number of strips contacted by air is large, so that the number of bubbles is large, and the resilience is common; the large and small hole combined extrusion die is a combined extrusion die with large holes and small holes, the obtained finished product has various textures, the line sizes are distributed, the bubbles of the product are relatively compromised, the resilience is stable, and the appearance is more unique; according to the invention, by changing the extrusion die, the change of the light-transmitting texture can be realized, and the diversity of the special appearance of the product is increased. Referring to fig. 6, fig. 6 is a schematic structural diagram and a finished product texture effect diagram of an extrusion die for supercritical extrusion compression molding in an embodiment of the present invention, where 1 is a large-hole extrusion die, 2 is a small-hole extrusion die, 3 is a large-hole and small-hole combined extrusion die, 4 is a finished product texture effect obtained by the large-hole extrusion die, 5 is a finished product texture effect obtained by the small-hole extrusion die, and 6 is a finished product texture effect obtained by the large-hole and small-hole combined extrusion die.

In the present invention, the temperature of the supercritical extrusion is preferably 190 to 205 ℃, more preferably 192 to 203 ℃; the pressure of the supercritical extrusion is preferably 5MPa to 10MPa, and more preferably 5MPa to 7 MPa; the extrusion rotating speed of the supercritical extrusion is preferably 100 r/min-140 r/min, and more preferably 120 r/min; the feeding amount of the supercritical extrusion is preferably 10 kg/h-20 kg/h, and more preferably 15 kg/h; the gas injection amount of the supercritical extrusion is preferably 4mL/min to 6mL/min, and more preferably 5mL/min to 5.5 mL/min; the gas injection pressure of the supercritical extrusion is preferably 10MPa to 14MPa, and more preferably 11.5MPa to 12.5 MPa.

In the present invention, the pressure for the press molding is preferably 4kg/cm²～6kg/cm²More preferably 4.5kg/cm²～5.5kg/cm²(ii) a The temperature of the forming die for compression molding is preferably 40-80 ℃, and more preferably 60-80 ℃; the actual compression molding temperature is 10 ℃ lower than that of the molding die; the molding time for the press molding preferably includes: heating and shaping for 400-700 s in the mold, and naturally cooling and shaping for 10-14 h; more preferably: heating and shaping for 400-600 s in the mold, and naturally cooling and shaping for 12 h.

In the present invention, a schematic process of the supercritical extrusion molding to obtain the midsole body with light-transmitting texture is shown in fig. 7; in the process, the texture variations formed include: the side wall is conveyed to a forming die through an extrusion die, and the side wall has relatively few textures; since the bottom is the platform on which each extruded material needs to land, the bottom is given a relative appearance advantage during the process of being stacked on top of each other, exhibiting a relatively dense texture. The invention adopts supercritical extrusion and compression molding to obtain the insole main body with the light-transmitting texture, finishes the preparation in one-step extrusion and compression molding manner, has simple process, no need of vulcanization, short flow, high efficiency and low cost (the volume production cost is 200-300 percent lower than that of the BOOTS process in the prior art), can recycle waste materials, has low overall cost, is green and environment-friendly, and has wide application prospect.

After the insole main body with the light-transmitting texture is obtained, the insole main body with the light-transmitting texture is aerated to obtain the insole material with natural light transmission. The uniformly distributed air holes are formed in the insole main body with the light-transmitting texture, so that the internal cavities of the product can be reduced, and the material is more stable and cannot collapse.

The invention provides a midsole material with natural light transmission, which comprises the following components: a midsole body having a light transmitting texture; air holes uniformly distributed on the insole main body; the insole main body with the light-transmitting texture is formed by molding a thermoplastic polyurethane elastomer mixed material through supercritical extrusion molding. Compared with the prior art, the insole material with natural light transmittance provided by the invention is molded by supercritical extrusion and compression to obtain an insole main body with light transmittance texture, and uniformly distributed air holes are arranged to reduce the internal cavities of the product, so that the material is more stable and cannot collapse; the product has natural light transmission on the basis of good shock absorption and rebound resilience, can obtain irreplaceable appearance lines and peculiar landscapes under light sensation, and has high cost performance.

In addition, the preparation method provided by the invention adopts one-step extrusion molding to finish the preparation of the shoe midsole material, has simple process, short flow and high efficiency, does not need vulcanization, can realize the change of light-transmitting textures by changing an extrusion die, increases the diversity of special appearances of products and has wide application prospect.

To further illustrate the present invention, the following examples are provided for illustration. The starting materials used in the following examples of the present invention are all commercially available products.