Microporous foaming material and preparation method thereof

Abstract

The invention discloses a microcellular foam material and a preparation method thereof, the microcellular foam material is prepared by foaming an elastomer composite material, and the elastomer composite material comprises the following components by mass: 10-50 parts of an ethylene-vinyl acetate copolymer; 10 to 15 parts of an olefin block copolymer; 10 to 30 parts of polyurethane crude latex; 5-15 parts of ethylene propylene diene monomer; 0.5 to 1.5 parts of activated zinc oxide; 0.5 to 0.8 part of a peroxide vulcanizing agent; 5-8 parts of an open pore foaming agent; the microcellular foam material is of an open-cell spherical foam structure. The microcellular foaming material disclosed by the invention has relatively low density and excellent elasticity and restorability, can quickly restore to the original shape after being pressed, and can remarkably improve the comfort and functionality of shoes by virtue of the excellent properties such as light weight, cushioning property and air permeability.

Description

Technical Field

[0001] The invention relates to the technical field of shoe product materials, in particular to a microporous foam material and a preparation method thereof. Background Art

[0002] The soles of sports shoes are usually composed of an outsole and a midsole. The outsole refers to the layer structure that is in direct contact with the ground, usually made of natural rubber or artificial rubber, and has functions such as anti-slip, wear-resistant and bending-resistant. The midsole generally refers to the structure between the insole and the outsole, which mainly plays a role in shock absorption or rebound.

[0003] At present, Chinese patent application number: CN201910018662.4 discloses a coarse-pore composite foam material for sports shoes, its preparation method and application. The material is made by foaming an expandable elastomer composite material. The expandable elastomer composite material includes the following components in parts by mass: 15 to 25 parts of polyolefin elastomer; 20 to 45 parts of ethylene-vinyl acetate copolymer; 15 to 35 parts of olefin block copolymer; 5 to 10 parts of polyethylene; 2 to 8 parts of calcium carbonate; 0.6 to 1.5 parts of nano-active zinc oxide; 0.5 to 0.8 parts of stearic acid; 0.5 to 0.8 parts of a cross-linking agent; 3 to 5 parts of a coarse-pore foaming agent; the coarse-pore composite foam material for sports shoes has an open-pore spherical foam structure.

[0004] However, the overall weight of the coarse-pore composite foam material in the prior art is relatively large, and due to its large pore size, it is not easy to effectively regulate the circulation of air. After being produced into a sole, it is easy to cause moisture and odor in the shoe. In addition, the uniformity of the coarse-pore material is relatively poor, which can easily affect the strength and wear resistance of the overall structure. Summary of the invention

[0005] The object of the present invention is to provide a microporous foam material and a preparation method thereof to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a microporous foam material is prepared by foaming an elastomer composite material, wherein the elastomer composite material is composed of the following components in parts by weight:

[0007] 10-50 parts of ethylene vinyl acetate copolymer;

[0008] 10-15 parts of an olefin block copolymer;

[0009] 10-30 parts of polyurethane crude latex;

[0010] 5-15 parts of EPDM;

[0011] 0.5-1.5 parts of activated zinc oxide;

[0012] 0.5-0.8 parts of peroxide curing agent;

[0013] 5-8 parts of open-cell foaming agent;

[0014] Preferably, the microporous foam material has an open-cell spherical cell structure. Preferably, the cell diameter of the microporous foam material is 0.01-0.2 mm.

[0015] Preferably, the specific gravity of the ethylene vinyl acetate copolymer is 0.93-0.95 g / cm 3 The specific gravity of the olefin block copolymer is 0.85-1.0 g / cm 3 The specific gravity of the polyurethane crude latex is 0.8-0.9g / cm 3 The specific gravity of the EPDM rubber is 0.85-0.95 g / cm3.

[0016] Preferably, the ethylene vinyl acetate copolymer is selected from one or both of a high acetate content ethylene vinyl acetate copolymer and a low acetate content ethylene vinyl acetate copolymer.

[0017] The present invention provides a method for preparing the microporous foam material as described above, comprising the following steps:

[0018] S1, placing the elastomer composite material into an internal mixer and kneading for 10-15 minutes;

[0019] S2. Put the kneaded materials into an open mill and disperse them for 3-5 minutes;

[0020] S3, the dispersed material is placed in a granulation equipment for 20-30 minutes of granulation treatment;

[0021] S4, performing IP injection foaming and / or micro-foaming on the prepared elastomer composite material particles to obtain a microporous foaming material.

[0022] Preferably, the granulation equipment includes a support, a granulation extrusion body is fastened to the top side of the support, a drive motor is fastened to the right side of the granulation extrusion body, and a feed bin is installed on the top right side of the granulation extrusion body, inspection covers are provided on the left side and the middle right side of the front part of the granulation extrusion body, a discharge mechanism is locked and fixed at the discharge point on the left side of the granulation extrusion body, an auger is installed inside the granulation extrusion body, and the right end of the auger is connected to the output end of the drive motor, and the top right side of the discharge mechanism is in contact with the granulation extrusion body.

[0023] Preferably, the discharging mechanism includes a pelletizing structure fastened to the granulating extrusion body on the right side, a connecting seat connected to the bottom side of the pelletizing structure, a cooling silo fastened to the bottom side of the connecting seat, a fan installed on the left side of the cooling silo, a support piece fixed to the right side of the fan, a gasket fastened to the top side of the right part of the support piece, a switch cover hinged to the middle side of the front part of the cooling silo, and a discharging seat fixed to the right side of the bottom of the cooling silo, the top side of the gasket is in contact with the granulating extrusion body, and the middle part of the support piece is a hollow grid structure.

[0024] Preferably, the pelletizing structure includes a barrel cover fastened to the granulation extrusion body on the right side, a first servo motor fastened to the middle part of the left side of the barrel cover, a rotating shaft rod connected to the right side output end of the first servo motor, a cutter fastened to the right end of the rotating shaft rod by bolts, a flow channel plate contacting the right side of the cutter, a rod holder wrapped and slid on the outer surface of the rotating shaft rod, and a shift assembly fastened to the left side of the rear part of the rod holder, the rotating shaft rod penetrates and rotates on the middle side of the barrel cover, the flow channel plate is fixed to the right side of the barrel cover by bolts, the rear side of the shift assembly is fastened to the barrel cover, the cutter is a cross-shaped structure, a solid structure in the shape of a cross is provided in the middle of the flow channel plate, and holes are distributed on the outside of the solid structure of the cross, and the rods of the rod holder correspond to the positions of the holes of the flow channel plate.

[0025] Preferably, the left and right sides of the outer surface of the rotating shaft rod are respectively wrapped with a first bearing block and a second bearing block, the rear sides of the first bearing block and the second bearing block are fastened to the barrel cover, an annular positioning piece is arranged on the right side inside the barrel cover, and the right side of the positioning piece is in contact with the flow channel disk.

[0026] Preferably, the shift assembly includes a support plate fastened to the barrel cover at the rear side, a second servo motor fastened to the lower left side of the front portion of the support plate, a pulley group connected to the right output end of the second servo motor, a first screw and a second screw coaxially rotating on the upper and lower sides of the right portion of the pulley group, a supporting block wrapped and rotated on the left side of the outer surface of the first screw and the second screw, an internally threaded shift block threadedly connected to the outer surfaces of the first screw and the second screw, and a boss fixedly connected to the middle side of the front portion of the internally threaded shift block, the middle side of the front portion of the boss is connected to the rod insertion frame, the right ends of the first screw and the second screw are both rotatably connected to the support plate, the rear side of the supporting block is fixed to the support plate, and the rear side of the internally threaded shift block is in sliding contact with the support plate.

[0027] Preferably, the first screw and the second screw have the same size and the same thread direction, and internal thread blocks are provided on both upper and lower sides of the internal thread displacement block, and the two internal thread blocks are respectively threadedly connected to the outer surfaces of the first screw and the second screw.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The microporous foam material of the present invention is mainly used as a shoe midsole material, has a low density, excellent elasticity and recovery, can quickly return to its original shape after being subjected to pressure, and can significantly improve the comfort and functionality of shoes by virtue of its excellent properties such as light weight, shock absorption, and air permeability.

[0030] In the preparation method of the microporous foam material of the present invention, the use of the granulating equipment is optimized, the material inside the granulator body is pushed and squeezed into the discharging mechanism and then diced by the dicing structure, the diced material enters the cooling silo, and the external airflow is allowed to enter under the action of the fan to cool the elastomer composite material particles, so as to maintain the molding effect of the composite material particles, and the dicing structure is further optimized. When the dicing work is not performed, the cutter of the cross-shaped structure is located at the solid structure of the cross of the flow channel disk, and no obstruction is generated on the rod insertion frame, so that the rod insertion frame can be inserted into the channel of the flow channel disk through the shifting component, and the elastomer composite material retained in the channel is pushed out, so as to prevent the elastomer composite material from cooling in the channel of the flow channel disk and affecting the extrusion of the material during the next work, thereby improving the production work efficiency to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an enlarged picture of the inner waist portion of the side wall of the sole of the microporous foam material obtained in Example 1 of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the granulation equipment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the discharging mechanism of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the pelletizing structure of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure inside the barrel cover of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the displacement assembly of the present invention.

[0037] In the figure: support 1, granulation extrusion body 2, drive motor 3, feed bin 4, inspection cover 5, discharging mechanism 6, pelletizing structure 61, connecting seat 62, cooling bin barrel 63, fan 64, support piece 65, gasket 66, switch cover 67, discharging seat 68, barrel cover 611, first servo motor 612, rotating shaft rod 613, cutter 614, runner plate 615, rod holder 616, shift assembly 617, positioning piece 6111, first bearing block 6131, second bearing block 6132, support plate 6171, second servo motor 6172, pulley assembly 6173, first screw rod 6174, second screw rod 6175, support block 6176, internal thread displacement block 6177, convex seat 6178. DETAILED DESCRIPTION

[0038] In order to further explain the technical solution of the present invention, it is described in detail below through specific embodiments.

[0039] The present invention provides a microporous foam material, which is prepared by foaming an elastomer composite material, wherein the elastomer composite material is composed of the following components in parts by weight:

[0040] 10-50 parts of ethylene vinyl acetate copolymer;

[0041] 10-15 parts of an olefin block copolymer;

[0042] 10-30 parts of polyurethane crude latex;

[0043] 5-15 parts of EPDM;

[0044] 0.5-1.5 parts of activated zinc oxide;

[0045] 0.5-0.8 parts of peroxide curing agent;

[0046] 5-8 parts of open-cell foaming agent;

[0047] The microporous foam material has an open-cell spherical cell structure, and the cell diameter of the microporous foam material is 0.01-0.2 mm.

[0048] Preferably, the ethylene vinyl acetate copolymer is selected from ethylene vinyl acetate copolymers with high acetate content.

[0049] Among them, ethylene vinyl acetate copolymer is a copolymer of ethylene and vinyl acetate. Vinyl acetate monomer is introduced into the molecular chain, thereby reducing the high crystallinity and improving the toughness, impact resistance, filler compatibility and heat sealing performance; the preferred specific gravity is 0.948g / cm 3The olefin block copolymer is a polyethylene-polypropylene-polyethylene copolymer, which has good elasticity and flexibility and is lightweight; the preferred specific gravity is 0.866 g / cm 3 Polyurethane crude latex is a water-based latex based on polyurethane. It is a water-based material and has no volatile organic compounds (VOC). It is environmentally friendly and has good elasticity. It can effectively absorb impact and improve the durability and comfort of the material. The preferred specific gravity is 0.855g / cm 3 EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It has excellent aging resistance such as ozone resistance, heat resistance, weather resistance, etc. The preferred specific gravity is 0.87g / cm 3 .

[0050] The microporous foam material provided in the present application is mainly used as a shoe midsole material. It has a low density, excellent elasticity and recovery, and can quickly return to its original shape after being subjected to pressure. With its excellent properties such as light weight, shock absorption, and breathability, it can significantly improve the comfort and functionality of shoes.

[0051] Example 1

[0052] See also Figure 2-6 The present invention provides a method for preparing a microporous foam material, comprising the following steps:

[0053] S1. Weigh the following ingredients by mass: 20-50 parts of ethylene-vinyl acetate copolymer, 5-10 parts of olefin block copolymer, 10-20 parts of crude polyurethane latex and 5-10 parts of ethylene propylene diene monomer rubber, put them into an internal mixer and knead them for 5-7 minutes at a temperature of 115-120° C. to obtain a first material, then weigh the following ingredients by mass: 0.5-1.5 parts of active zinc oxide, 0.5-0.8 parts of peroxide vulcanizing agent and 5-8 parts of open-cell foaming agent, add them to the first material after kneading and mixing, and knead them again for 5-8 minutes at a temperature of 118-125° C. to obtain a second material;

[0054] S2, putting the kneaded second material into an open mill and dispersing it for 3-5 minutes;

[0055] S3, the dispersed material is placed in a granulation device for 20-30 minutes of granulation treatment, the temperature is preferably 115-125 ° C, to obtain elastomer composite material particles;

[0056] S4. The prepared elastomer composite material particles are subjected to IP injection foaming at a foaming temperature of 182 to 185° C. for 400 to 600 seconds to obtain a microporous foamed material.

[0057] Through experimental tests, the microporous foam material prepared by the above method has a hardness of 45°A, a rebound rate of 55%, and a density of 0.21.

[0058] The granulation equipment includes a support 1, a granulation extrusion body 2 is fastened to the top side of the support 1, a driving motor 3 is fastened to the right side of the granulation extrusion body 2, and a feed bin 4 is installed on the top right side of the granulation extrusion body 2, an auger is installed inside the granulation extrusion body 2, and the right end of the auger is connected to the output end of the driving motor 3, the material enters the granulation extrusion body 2 through the feed bin 4, and the auger in the granulation extrusion body 2 is driven by the driving motor 3 to rotate to push the material out, and the front left side and the middle right side of the granulation extrusion body 2 are both provided There is an inspection cover 5 to facilitate the inspection and cleaning of the inside of the granulator body 2. A discharge mechanism 6 is locked and fixed at the discharge position on the left side of the granulator extrusion body 2. After the material is pushed into the discharge mechanism 6, it is pelletized. After pelletizing, the elastomer composite material particles can be quickly cooled to ensure the molding effect of the particles. At the same time, the discharge mechanism 6 can avoid the material from being blocked at the discharge port when the equipment stops working, reducing the time for cleaning and maintenance. The right side of the top of the discharge mechanism 6 is in contact with the granulator extrusion body 2. The discharge mechanism 6 includes a right side and a The pelletizing extrusion body 2 is fastened with a pelletizing structure 61, so that the material is pelletized by the pelletizing structure 61, a connecting seat 62 connected to the bottom side of the pelletizing structure 61, a cooling silo 63 fastened to the bottom side of the connecting seat 62, a fan 64 installed on the left side of the cooling silo 63, a support piece 65 fixed to the right side of the fan 64, a gasket 66 fastened to the top side of the right part of the support piece 65, a switch cover 67 hinged to the middle side of the front part of the cooling silo 63, and a discharge seat 68 fixed to the right side of the bottom of the cooling silo 63, and the middle part of the support piece 65 is hollow The grid structure is shaped to facilitate the airflow to flow in the cooling silo 63. The pelletized material enters the cooling silo 63 through the connecting seat 62. Under the action of the fan 64, the external airflow enters the cooling silo 63 to cool the elastomer composite material particles and maintain the molding effect of the composite material particles. The elastomer composite material particles after cooling are discharged and collected through the discharge seat 68. The top side of the gasket 66 is in contact with the granulation extrusion body 2, which plays a supporting role and ensures the stability of the granulation extrusion body 2.

[0059] The pelletizing structure 61 includes a barrel cover 611 fastened to the granulating extrusion body 2 on the right side, a first servo motor 612 fastened to the middle of the left side of the barrel cover 611, a rotating shaft rod 613 connected to the right output end of the first servo motor 612, a cutter 614 fastened to the right end of the rotating shaft rod 613 by bolts, a flow channel plate 615 contacting the right side of the cutter 614, a rod holder 616 wrapped and slidable on the outer surface of the rotating shaft rod 613, and a displacement component 617 fastened to the left rear part of the rod holder 616. 13 penetrates and rotates in the middle side of the barrel cover 611. Under the action of the first servo motor 612, the rotating shaft rod 613 drives the cutter 614 to rotate on the flow channel plate 615 to cut the extruded elastomer composite material into pellets. The flow channel plate 615 is fixed to the right side of the barrel cover 611 by bolts. The flow channel plate 615 can be disassembled, replaced or cleaned. The rear side of the shifting assembly 617 is fastened to the barrel cover 611. The cutter 614 is a cross-shaped structure. A solid structure in the shape of a cross is provided in the middle of the flow channel plate 615, and the solid structure of the cross There are holes on the outside, and the insertion rod of the insertion rod rack 616 corresponds to the hole of the flow channel plate 615. When the pelletizing work is not performed, the cross-shaped cutter 614 is located at the solid structure of the flow channel plate 615 in the shape of a cross, and does not block the insertion rod rack 616, so that the insertion rod rack 616 can be inserted into the hole of the flow channel plate 615 through the shifting component 617 to push out the elastomer composite material retained in the hole, so as to prevent the elastomer composite material from cooling in the hole of the flow channel plate 615 and affecting the extrusion of the material during the next work. The first bearing block 6131 and the second bearing block 6132 are respectively wrapped on the left and right sides of the outer surface of the rotating shaft rod 613. The rear sides of the first bearing block 6131 and the second bearing block 6132 are fastened to the barrel cover 611 to ensure the stability of the rotation of the rotating shaft rod 613. An annular positioning piece 6111 is arranged on the right side inside the barrel cover 611, and the right side of the positioning piece 6111 is in contact with the flow channel disk 615, which plays a role in installing and positioning the flow channel disk 615, thereby ensuring the stable contact between the cutter 614 and the flow channel disk 615.

[0060] The shifting assembly 617 includes a support plate 6171 fastened to the barrel cover 611 at the rear side, a second servo motor 6172 fastened to the lower left side of the front portion of the support plate 6171, a pulley group 6173 connected to the right output end of the second servo motor 6172, and a first screw rod 6174 and a second screw rod 6175 coaxially rotating on the upper and lower sides of the right portion of the pulley group 6173, respectively. Under the action of the second servo motor 6172, the pulley group 6173 drives the first screw rod 6174 and the second screw rod 6175 to rotate. The supporting block 6176 wrapped and rotated on the left side of the outer surface of the first screw 6174 and the second screw 6175 plays a supporting role to ensure the stability of the first screw 6174 and the second screw 6175, the internal thread displacement block 6177 threadedly connected to the outer surface of the first screw 6174 and the second screw 6175 and the convex seat 6178 fixedly connected to the front middle side of the internal thread displacement block 6177, the front middle side of the convex seat 6178 is connected to the rod holder 616, Under the action of rotation, the internal thread displacement block 6177 is displaced laterally, and the internal thread displacement block 6177 drives the insertion rod frame 616 to be displaced laterally through the convex seat 6178 so that the insertion rod frame 616 is inserted into the channel of the flow channel plate 615 when it moves to the far right. When the insertion rod frame 616 moves to the far left, it does not get stuck with the cutter 614. The right ends of the first screw 6174 and the second screw 6175 are both rotatably connected to the support plate 6171, and the rear side of the support block 6176 is fixed to the support plate 6171. The rear side of the internal thread displacement block 6177 is fixed to the support plate 6171. The support plate 6171 is in sliding contact to ensure the stability of the displacement of the internal thread displacement block 6177. The first screw rod 6174 and the second screw rod 6175 are of the same size and have the same thread direction. Internal thread blocks are provided on the upper and lower sides of the internal thread displacement block 6177. The two internal thread blocks are respectively threadedly connected to the outer surfaces of the first screw rod 6174 and the second screw rod 6175, so that the internal thread displacement block 6177 can be driven to perform a stable lateral displacement action through the cooperation between the two screw rods and the internal thread block inside the internal thread displacement block 6177.

[0061] Example 2

[0062] The present invention provides a method for preparing a microporous foam material, comprising the following steps:

[0063] S1. Weigh the following ingredients by mass: 10-40 parts of ethylene-vinyl acetate copolymer, 5-10 parts of olefin block copolymer, 15-25 parts of crude polyurethane latex and 5-15 parts of ethylene propylene diene monomer rubber, put them into an internal mixer and knead them for 5-7 minutes at a temperature of 115-120° C. to obtain a first material, then weigh the following ingredients by mass: 0.5-1.5 parts of active zinc oxide, 0.5-0.8 parts of peroxide vulcanizing agent and 5-8 parts of open-cell foaming agent, add them to the first material after kneading and mixing, and knead them again for 5-8 minutes at a temperature of 118-125° C. to obtain a second material;

[0064] S2, putting the kneaded second material into an open mill and dispersing it for 3-5 minutes;

[0065] S3, the dispersed material is placed in a granulation device for 20-30 minutes of granulation treatment, the temperature is preferably 115-125 ° C, to obtain elastomer composite material particles;

[0066] S4. The prepared elastomer composite material particles are subjected to IP injection foaming at a foaming temperature of 182 to 185° C. for 400 to 600 seconds to obtain a microporous foamed material.

[0067] According to experimental tests, the microporous foam material prepared by the above method has a hardness of 42°A, a rebound rate of 58%, and a density of 0.20.

[0068] Example 3

[0069] The present invention provides a method for preparing a microporous foam material, comprising the following steps:

[0070] S1. Weigh the following ingredients by mass: 10-30 parts of ethylene-vinyl acetate copolymer, 10-15 parts of olefin block copolymer, 20-30 parts of crude polyurethane latex and 5-10 parts of ethylene propylene diene monomer rubber, put them into an internal mixer and knead them for 5-7 minutes at a temperature of 115-120° C. to obtain a first material, then weigh the following ingredients by mass: 0.5-1.5 parts of active zinc oxide, 0.5-0.8 parts of peroxide vulcanizing agent and 5-8 parts of open-cell foaming agent, add them to the first material after kneading and mixing, and knead them again for 5-8 minutes at a temperature of 118-125° C. to obtain a second material;

[0071] S2, putting the kneaded second material into an open mill and dispersing it for 3-5 minutes;

[0072] S3, the dispersed material is placed in a granulation device for 20-30 minutes of granulation treatment, the temperature is preferably 115-125 ° C, to obtain elastomer composite material particles;

[0073] S4. The prepared elastomer composite material particles are subjected to IP injection foaming at a foaming temperature of 182 to 185° C. for 400 to 600 seconds to obtain a microporous foamed material.

[0074] According to experimental tests, the microporous foam material prepared by the above method has a hardness of 42°A, a rebound rate of 62%, and a density of 0.18.

[0075] When the present invention is applied to the preparation of midsoles, a single-color or double-color midsoles can be produced, and the production process is as follows:

[0076] Single color: weigh the microporous foam material and pour it for foaming for 400-600 seconds, then perform oil pressure shaping, heat for 400-600 seconds, cool for 400-600 seconds, and then trim the formed material to obtain a single color midsole.

[0077] Two-color: After weighing the microporous foam material, it is injection molded into a blank through a disc machine, and then foamed for 500-800 seconds through a vacuum hood, and then oil pressure is used for shaping, heated for 400-600 seconds, cooled for 400-600 seconds, and then the molded material is trimmed to obtain a two-color midsole.

[0078] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microporous foam material, characterized in that: The elastomer composite material is prepared by foaming, and the elastomer composite material is composed of the following components in parts by mass: 10-50 parts of ethylene vinyl acetate copolymer; 10-15 parts of olefin block copolymer; 10-30 parts of polyurethane crude latex; 5-15 parts of ethylene propylene rubber; 0.5-1.5 parts of active zinc oxide; 0.5-0.8 parts of peroxide vulcanizing agent; 5-8 parts of open-cell foaming agent; The microporous foam material has an open-cell spherical cell structure, and the cell diameter of the microporous foam material is 0.01-0.2 mm.

2. A microporous foam material according to claim 1, characterized in that: The specific gravity of the ethylene vinyl acetate copolymer is 0.93-0.95 g / cm 3 The specific gravity of the olefin block copolymer is 0.85-1.0 g / cm 3 The specific gravity of the polyurethane crude latex is 0.8-0.9g / cm 3 , the EPDM rubber is 0.85-0.95g / cm 3 .

3. The microporous foam material according to claim 1, characterized in that: The ethylene vinyl acetate copolymer is selected from one or both of an ethylene vinyl acetate copolymer with high acetate content and an ethylene vinyl acetate copolymer with low acetate content.

4. A method for preparing a microporous foam material, for preparing the microporous foam material as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1, placing the elastomer composite material into an internal mixer and kneading for 10-15 minutes; S2. Put the kneaded materials into an open mill and disperse them for 3-5 minutes; S3, the dispersed material is placed in a granulation equipment for 20-30 minutes of granulation treatment; S4, performing IP injection foaming and / or micro-foaming on the prepared elastomer composite material particles to obtain a microporous foaming material.

5. The method for preparing a microporous foam material according to claim 4, characterized in that: The granulation equipment comprises a support (1), a granulation extrusion body (2) is fastened to the top side of the support (1), a drive motor (3) is fastened to the right side of the granulation extrusion body (2), and a feed bin (4) is installed on the top right side of the granulation extrusion body (2), an inspection cover (5) is provided on the left side and the middle right side of the front part of the granulation extrusion body (2), a discharge mechanism (6) is locked and fixed at the discharge point on the left side of the granulation extrusion body (2), an auger is installed inside the granulation extrusion body (2), and the right end of the auger is connected to the output end of the drive motor (3), and the top right side of the discharge mechanism (6) is in contact with the granulation extrusion body (2).

6. The method for preparing a microporous foam material according to claim 5, characterized in that: The discharging mechanism (6) comprises a pelletizing structure (61) fastened to the granulating extrusion body (2) on the right side, a connecting seat (62) connected to the bottom side of the pelletizing structure (61), a cooling silo (63) fastened to the bottom side of the connecting seat (62), a fan (64) installed on the left side of the cooling silo (63), a support sheet (65) fixed to the right side of the fan (64), a gasket (66) fastened to the top side of the right part of the support sheet (65), a switch cover (67) hinged to the middle side of the front part of the cooling silo (63), and a discharging seat (68) fixed to the right side of the bottom of the cooling silo (63), the top side of the gasket (66) is in contact with the granulating extrusion body (2), and the middle part of the support sheet (65) is a hollow grid structure.

7. The method for preparing a microporous foam material according to claim 6, characterized in that: The pelletizing structure (61) comprises a barrel cover (611) fastened to the pelletizing extrusion body (2) on the right side, a first servo motor (612) fastened to the middle part of the left side of the barrel cover (611), a rotating shaft rod (613) connected to the right output end of the first servo motor (612), a cutter (614) fastened to the right end of the rotating shaft rod (613) by bolts, a flow channel plate (615) contacting and arranged on the right side of the cutter (614), a rod insertion frame (616) wrapped and slidable on the outer surface of the rotating shaft rod (613), and a rod insertion frame (616) fastened to the left rear part of the rod insertion frame (616). The shift assembly (617) on the side, the rotating shaft rod (613) penetrates and rotates on the middle side of the barrel cover (611), the flow channel plate (615) is fixed to the right side of the barrel cover (611) by bolt locking, the rear side of the shift assembly (617) is fastened to the barrel cover (611), the cutter (614) is a cross-shaped structure, a solid structure in the shape of a cross is arranged in the middle of the flow channel plate (615), and holes are distributed on the outside of the solid structure of the cross, and the insertion rod of the insertion rod frame (616) corresponds to the position of the hole of the flow channel plate (615).

8. The method for preparing a microporous foam material according to claim 7, characterized in that: The left and right sides of the outer surface of the rotating shaft rod (613) are respectively wrapped with a first bearing block (6131) and a second bearing block (6132); the rear sides of the first bearing block (6131) and the second bearing block (6132) are both fastened to the barrel cover (611); an annular positioning piece (6111) is arranged on the right side inside the barrel cover (611), and the right side of the positioning piece (6111) is in contact with the flow channel plate (615).

9. The method for preparing a microporous foam material according to claim 7, characterized in that: The shifting assembly (617) comprises a support plate (6171) fastened to the barrel cover (611) at the rear side, a second servo motor (6172) fastened to the lower left side of the front portion of the support plate (6171), a pulley group (6173) connected to the right output end of the second servo motor (6172), a first screw rod (6174) and a second screw rod (6175) coaxially rotating on the upper and lower sides of the right portion of the pulley group (6173), a support block (6176) wrapped and rotated on the left side of the outer surface of the first screw rod (6174) and the second screw rod (6175), and a first screw rod (6174) and a second screw rod (6175) threadedly connected to the first screw rod (6174). An internally threaded displacement block (6177) on the outer surface of a screw rod (6174) and a second screw rod (6175) and a convex seat (6178) fixedly connected to the front middle side of the internally threaded displacement block (6177), the front middle side of the convex seat (6178) is connected to the rod insertion frame (616), the right ends of the first screw rod (6174) and the second screw rod (6175) are both rotatably connected to the support plate (6171), the rear side of the support block (6176) is fixed to the support plate (6171), and the rear side of the internally threaded displacement block (6177) is in sliding contact with the support plate (6171).

10. The method for preparing a microporous foam material according to claim 9, characterized in that: The first screw rod (6174) and the second screw rod (6175) are of the same size and have the same thread direction. Internal thread blocks are arranged on both upper and lower sides of the internal thread displacement block (6177), and the two internal thread blocks are respectively threadedly connected to the outer surfaces of the first screw rod (6174) and the second screw rod (6175).

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